• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    WELL CUTTING CUTTING TOOL. The present invention relates to a well-bottom tubing cutting tool for submersion in a liner in a well and separating an upper part of the liner from a lower part of the liner by cutting the liner from the inside, the tool extending in a longitudinal direction, comprising a tool housing that has a first and a second part of the housing, a cutting arm, which is hingedly connected to the first part of the liner and has a cutting edge in a first the end, said arm being movable between a retracted position and a projected position in relation to the tool structure, an arm activation assembly for moving the cutting arm between the retracted position and the projected position, and an arranged rotating axis in the second part of the liner and connected with the first part of the housing to rotate the cutting arm.
    公开号:BR112013030443B1
    申请号:R112013030443-0
    申请日:2012-05-31
    公开日:2021-02-17
    发明作者:Jørgen Hallundbæk
    申请人:Welltec A/S.；
    IPC主号:
    专利说明:

    [0001] [0001] The present invention relates to a downhole pipe cutting tool for submersion within a well casing and separating an upper part of the casing from a lower part of the casing, cutting the casing from the inside, the tool extending in a longitudinal direction, comprising a tool housing having a first and a second housing part, a cutting arm, which is hingedly connected to the first housing part and has a cutting edge in a first end, said arm being movable between a retracted position and a projected position in relation to the tool structure, an arm activation assembly for moving the cutting arm between the retracted position and the projected position, and a rotary axis disposed in the second part of the housing and connected with the first part of the housing, to rotate the cutting arm. The invention also relates to a downhole system comprising a downhole pipe cutting tool according to the invention, and a drive unit for moving the downhole pipe cutting tool towards to the coating. Background of the Technique
    [0002] [0002] After drilling, a hole, a liner or a liner is introduced into the well, submerging the assembled column in a liner. Occasionally when doing so, the liner becomes stuck due to a local collapse of the hole around the liner, and the liner cannot therefore be submerged further. In order to locate the collapse area, a measuring tool is submerged within the coating. When the collapse area is found, a drill gun is placed to drill into that area to loosen the liner. If this is not possible, the coating is cut just above the collapse area.
    [0003] [0003] The coating can be cut by explosives, which is dangerous, and is therefore a necessity for a mechanical solution to separate the upper coating from the lower coating, without getting stuck. Summary of the Invention
    [0004] [0004] It is an objective of the present invention to overcome all or part of the above disadvantages and the drawbacks of the prior art. More specifically, it is an objective to provide a downhole tool in which the downhole tool is able to cut an upper part of the coating, without the use of explosives.
    [0005] - um alojamento da ferramenta possuindo uma primeira e uma segunda parte do revestimento, - um braço de corte, que é ligado de forma articulada com a primeira parte do alojamento e tem uma aresta de corte em uma primeira extremidade, o dito braço sendo móvel entre uma posição retraída e uma posição projetada em relação à estrutura da ferramenta, - um conjunto de ativação do braço para mover o braço de corte entre a posição retraída e a posição projetada, e - um eixo rotativo disposto na segunda parte do alojamento e ligado com a primeira parte do alojamento para girar o braço de corte, em que o conjunto de ativação do braço é composto por: - um alojamento de pistão disposta na primeira parte do alojamento e que compreende uma câmara de pistão, e - um elemento de pistão disposto no interior da câmara de pistão e engatado com o braço de corte para mover o braço de corte entre a posição retraída e a posição projetada, o elemento de pistão sendo móvel na direção longitudinal da ferramenta de fundo de poço e possuindo uma primeira face do pistão, e uma segunda face do pistão, o elemento de pistão sendo capaz de aplicar uma força que se projeta sobre o braço de corte através da aplicação de pressão hidráulica na primeira face do pistão e movendo o pistão em uma primeira direção. [0005] The above objectives, together with numerous other objectives, advantages and characteristics, which will become evident from the description below, are achieved by a solution according to the present invention by means of a pipe cutting tool. well bottom for submersion in a liner or a drill pipe in a well and separating an upper part of the liner from a lower part of the liner, cutting the liner from the inside, the tool extending in a longitudinal direction, comprising: - a tool housing having a first and a second coating part, - a cutting arm, which is hingedly connected to the first part of the housing and has a cutting edge at a first end, said arm being movable between a retracted position and a projected position in relation to the tool structure, - an arm activation assembly for moving the cutting arm between the retracted position and the projected position, and - a rotary axis arranged in the second part of the housing and connected with the first part of the housing to rotate the cutting arm, where the arm activation set consists of: - a piston housing arranged in the first part of the housing and comprising a piston chamber, and - a piston element disposed within the piston chamber and engaged with the cutting arm to move the cutting arm between the retracted position and the projected position, the piston element being movable in the longitudinal direction of the downhole tool, and having a first face of the piston, and a second face of the piston, the piston element being able to apply a force that projects on the cutting arm by applying hydraulic pressure on the first face of the piston and moving the piston in a first direction.
    [0006] [0006] By this means, it can be obtained that the coating can be separated in an upper part of the coating from a lower part of the coating, cutting the coating from the inside, without the use of explosives.
    [0007] [0007] In one embodiment, the first and second parts of the housing can be rotatably connected and the rotary axis can be rotatably arranged in the second housing part and connected with the first housing part to rotate the first housing and the cutting arm in relation to the second part of the housing.
    [0008] [0008] The arm being movable between a retracted position and a projected position is understood to be a retracted position and a projected position in relation to an axial extension of the tool housing.
    [0009] [0009] In another embodiment, the downhole pipe cutting tool can be submerged in a sheath in a well by steel cable or by means of a pipe, such as a flexible pipe or a drill pipe.
    [0010] [00010] In addition, the downhole pipe cutting tool can be a cable tool to be submerged in the well through a steel cable.
    [0011] [00011] In one embodiment, the piston chamber can be divided into a first section of the chamber and a second section of the chamber, and the hydraulic pressure on the first face of the piston, displacing the piston in the first direction, can be applied to the first section of chamber.
    [0012] [00012] In another embodiment, hydraulic pressure can be applied to the second chamber section by moving the piston element in a second direction opposite to the first direction.
    [0013] [00013] In yet another modality, the chamber can be divided by the piston.
    [0014] [00014] In addition, the chamber can be divided by a partition wall of the piston housing and through which the piston element extends.
    [0015] [00015] In addition, the second chamber may have a channel, thus allowing fluid to enter the second chamber when the piston element moves in the first direction.
    [0016] [00016] In addition, a valve can be arranged in the channel.
    [0017] [00017] In addition, a spring element can be arranged in the first part of the housing by applying a spring force to move the piston element in a second direction opposite to the first direction.
    [0018] [00018] In addition, the spring element can be arranged in the second chamber section.
    [0019] [00019] Additionally, the spring element can be a helical spring that surrounds the parts of the piston element.
    [0020] [00020] In one embodiment, the piston element may have a groove that cooperates with a second end of the cutting arm.
    [0021] [00021] Also, the groove can be a circumferential groove.
    [0022] [00022] In one embodiment, the piston element can be arranged coaxially in the tool housing.
    [0023] [00023] In another embodiment, the cutting arm can project radially from the tool housing.
    [0024] [00024] In yet another embodiment, the downhole pipe cutting tool may comprise a plurality of cutting arms, preferably three cutting arms.
    [0025] [00025] In addition, a downhole pipe cutting tool according to the invention may comprise an anchoring section for anchoring the second part of the housing in the casing.
    [0026] [00026] In addition, the anchoring section can be hydraulically activated.
    [0027] [00027] In one embodiment, the cutting arm in cross section can have an edge that forms an outer point of the arm when the arm is in its projected position, and the cutting edge can be arranged on the edge of the cutting arm that forms the edge of the cutting arm.
    [0028] [00028] In another embodiment, the tool may comprise an articulated connection arranged between the first and second parts of the housing.
    [0029] [00029] Also, a downhole pipe cutting tool according to the invention can comprise a gear section.
    [0030] [00030] In addition, a downhole pipe cutting tool according to the invention may comprise a rotation unit, such as an electric motor or a hydraulically driven impeller.
    [0031] [00031] The downhole pipe cutting tool can also include a gear section.
    [0032] [00032] In one embodiment, the gear section can be arranged between the rotation unit and the cutting arm.
    [0033] [00033] In addition, the gear section can be placed between the rotation unit and the rotary axis.
    [0034] [00034] In addition, the gear section can be arranged between the rotary axis and the cutting arm.
    [0035] [00035] In one embodiment, the cutting arm can be L-shaped creating a part of the heel and connected in an articulated way around a point of articulation arranged in the part of the heel.
    [0036] [00036] In addition, the cutting arm can have a central axis and rotate around the central axis.
    [0037] [00037] Additionally, the cutting arm can rotate around an axis of the longitudinal tool, as well as the central axis.
    [0038] [00038] In addition, the cutting arm may comprise an external sleeve, through which an axis of the arm extends, the axis of the arm being coupled to the rotary axis and connected to a rotary cutting head to transmit rotational force to the cutting head.
    [0039] [00039] By providing a rotary cutting head on the cutting arm being moved along the inner face of the liner or drill pipe, the cutting head performs an operation that can be referred to as upward grinding. This improves the ability of the downhole pipe cutting tool to cut through the casing or drill pipe. In addition, the risk of the downhole pipe cutting tool curl is reduced if the cutting arm gets stuck or jammed in the cut through the casing or drill pipe. This is due to the fact that the cutting movement is not only provided by rotating the cutting arm around the central axis of the downhole pipe cutting tool, but also by rotating the cutting head itself cutting arm. The cutting head is thus capable of rotating at a different speed than the cutting arm, which reduces the risk of the cutting head, reducing the speed of rotation of the cutting arm around the central axis of the tool.
    [0040] [00040] In one embodiment, the cutting edge can be provided on the cutting head.
    [0041] [00041] The shaft-bottom pipe cutting tool may further comprise a gear set provided in the first part of the housing, the rotary axis being coupled to a first gear in the gear set and the arm axis being coupled to a second gear of the gear set, in which a rotating force is transmitted from the rotary axis to the cutting head through the axis of the arm.
    [0042] [00042] In one embodiment, the gear ratio of the gear set can be 1: 1.
    [0043] [00043] In addition, the gear set can be a planetary gear, the rotary shaft being coupled to a solar gear in the gear set and the arm shaft being coupled to a planetary gear in the gear set, in which the rotation is transmitted from the rotary axis to the cutting head through the axis of the arm.
    [0044] [00044] In addition, the arm axis can comprise a first shaft part and a second shaft part interconnected by a double Cardan joint for transmitting the rotational force from the first shaft part to the second shaft part.
    [0045] [00045] In addition, the first part of the shaft and the second part of the shaft can be connected by a universal joint.
    [0046] [00046] The downhole pipe cutting tool may further comprise a rotating sleeve provided about the axis, wherein the first part of the housing is rotated by a rotating sleeve.
    [0047] [00047] In addition, the motor can rotate the rotary shaft and the rotating sleeve.
    [0048] [00048] In another embodiment, the cutting edge may comprise a plurality of cutting inserts.
    [0049] [00049] In yet another modality, the cutting edge is made from tungsten carbide.
    [0050] [00050] Additionally, the cutting inserts can be arranged in at least for the layers.
    [0051] [00051] In addition, a downhole pipe cutting tool according to the invention can comprise a pump to supply hydraulic pressure, the pump being rotatably arranged inside the tool housing, in which the hydraulic pump rotates together with the first part of the housing and the cutting arm.
    [0052] [00052] In one embodiment, the downhole pipe cutting tool may further comprise a pump to provide hydraulic pressure to move the cutting arm between the retracted and the projected position, the pump being disposed within the housing of the tool.
    [0053] [00053] In addition, the downhole pipe cutting tool may comprise a pump to provide hydraulic pressure to move the cutting arm between the retracted position and the projected position, the pump being disposed within the second housing of the tool.
    [0054] [00054] In addition, the downhole pipe cutting tool may comprise a pump arranged in the tool for supplying hydraulic pressure to move the cutting arm between the retracted position and the projected position, and comprising a motor arranged in the tool to start a pump and rotate the rotary shaft, the motor is being supplied with power through a cable.
    [0055] [00055] In addition, the downhole pipe cutting tool may also include an anchoring section for anchoring the second part of the housing to the liner.
    [0056] [00056] In addition, the anchoring section may comprise two anchoring arms connected pivotally, an anchoring arm connected pivotally to the second part of the housing and the other anchoring arm connected pivotally to a piston sleeve which can slide inside the second part of the accommodation.
    [0057] [00057] Finally, the anchor arms may have a toothed end facing an inner face of the liner when in a projected position.
    [0058] [00058] In addition, the pump can be driven by an electric motor powered by a cable.
    [0059] [00059] In addition, the tool housing may comprise channels for fluidly connecting the pump and piston chamber.
    [0060] -uma ferramenta de corte de tubulação de fundo de poço de acordo com qualquer da invenção, e -uma unidade de acionamento para mover a ferramenta de corte de tubulação de fundo de poço em direção ao revestimento. [00060] Finally, the invention relates to a downhole system, which comprises: -a downhole pipe cutting tool according to any of the invention, and -a drive unit for moving the downhole pipe cutting tool towards the casing.
    [0061] [00061] In one embodiment, the drive unit can be a self-propelled unit capable of driving itself and the downhole pipe cutting tool towards the well.
    [0062] [00062] In addition, the drive unit may comprise wheels arranged on projectable wheel arms from the tool housing, so that the wheels come into contact with an internal surface of the well. Brief Description of Drawings
    [0063] [00063] The invention and its many advantages will be described in more detail below with reference to the attached schematic drawings, which for the purpose of illustration show some non-limiting modalities and in which Fig. 1 shows a downhole system comprising a downhole pipe cutting tool, Fig. 2 shows a cross-sectional view of the downhole pipe cutting tool, where a cutting arm is in its projected position, Fig. 3 shows a cross-sectional view of another embodiment of the downhole pipe cutting tool, in which a cutting arm is in its projected position, Fig. 4 shows a cross-sectional view of another embodiment of the downhole pipe cutting tool, in which a cutting arm is in its projected position, Fig. 5 shows a cross-sectional view of another embodiment of the downhole pipe cutting tool comprising a rotary cutting head, and Fig. 6 shows a cross-sectional view of an anchoring section of a pipe cutting tool at the bottom of the well.
    [0064] [00064] All figures are highly schematic and not necessarily to scale, and they show only the parts that are necessarily to elucidate the invention, other parts that are being omitted or merely suggested. Detailed Description of the Invention
    [0065] [00065] FIG. 1 shows a downhole pipe cutting tool for submersion in a liner 2 or drill pipe 2 in a well 3 in the event that the liner or drill pipe is attached. This is done to separate an upper part 4 from a lower part 5 of the liner or the drill pipe, by cutting the liner from the inside by means of a cutting edge 10 arranged on a projected cutting arm 9. In fig. 1, the downhole pipe cutting tool 1 consists of a well system that has an electronic section 19 to control the power supply, before being directed to a rotation unit, such as an electric motor 20, driving a hydraulic pump 21. The downhole system further comprises an anchoring section 22 and a gear section 23. The downhole pipe cutting tool 1 is submerged within the liner, and the anchoring section 22 of the downhole system is hydraulically activated to anchor a second part 8 of the system's tool housing in relation to the liner 2. The motor is fed through a cable 24 and the electronic section 19 and drives the pump and rotates a rotating shaft 12 to rotate the cutting arm 9 to separate the top 4 from the bottom 5 of the liner 2. Thus, the well-bottom pipe cutting tool 1 is submerged in the well or liner only by a steel cable, p for example, with another type of supply line, such as an optical fiber, and not by piping, such as flexible pipe, drill pipe or similar pipe.
    [0066] [00066] As shown in fig. 2, the downhole pipe cutting tool 1 comprises a tool housing 6 having a first 7 and a second 8 housing parts and a cutting arm 9, being pivotally connected with the first housing part and having a cutting edge 10 at a first end. The arm is movable between a retracted position and a projected position in relation to the tool structure. The arm is shown in its projected position in fig. 2. The tool further comprises an arm activation set 11 for moving the cutting arm 9, between the retracted position and the projected position. A rotary axis 12 penetrates the second part of the housing 8 and is connected with, and forms part of the first part of the housing to rotate the cutting arm.
    [0067] [00067] The arm activation assembly 11 comprises a piston housing 13 arranged in the first part of the housing 7 and comprising a piston chamber 14. A piston element 15 is disposed within the piston chamber and engages with the piston arm cut 9, thus moving the cutting arm 9, between the retracted position and the projected position. The piston element 15 is movable in a longitudinal direction of the downhole pipe cutting tool and has a first piston face 16 and a second piston face 17. The hydraulic fluid from the pump is pumped into a first section of chamber 25 of chamber 14 through a first fluid channel 18, applying hydraulic pressure on the first face of the piston 16, and the piston moves in a first direction, applying a force projecting on the cutting arm 9.
    [0068] [00068] When the cutting arm is designed to press against the inner face of the liner or the drill pipe and is simultaneously rotated by the motor through the rotary axis, the cutting edge 10 is able to cut through the liner or the drill pipe drilling. By this means, it is achieved that an upper part of the coating can be separated from a lower part of a coating by cutting the coating from the inside, without the use of explosives.
    [0069] [00069] In fig. 2, the rotating shaft 12 supplies the fluid to the first section 25 of the chamber 14. The fluid coming from the pump is supplied to the shaft 12 through a circumferential groove 27, fluidly connected with a second fluid channel 28, in the second part of the housing 8. Thus, the fluid from the second fluid channel 28 is distributed in the circumferential groove 27, so that the first fluid channel 18 on the rotating shaft 12 is always supplied with pressurized fluid from the pump during rotation. The circumferential groove 27 is sealed by means of peripheral seals 29, such as, for example, sealing rings, on both sides of the circumferential groove 27.
    [0070] [00070] The piston element 15 moves in the longitudinal direction of the tool 1 inside the piston chamber and divides the chamber 14 into a first section of the chamber 25 and a second section of the chamber 26. When the piston element moves in the In the first direction, a spring element 40 that abuts the second face of the piston 17, opposite the first face of the piston 16, is compressed. Since the spring element is compressed, therefore, it is the second section of the chamber, and the fluid flows into it through a fourth channel 44 fluidly connected with the first channel 18. The spring element, which is a helical spring , around the part of the piston element disposed in the second part of the chamber 26, is therefore compressed between the second face of the piston 17 and the piston chamber 14. The piston element has a first end 30 which extends outwardly of the piston housing 13 and engages the cutting arm having a circumferential groove 31 to which a second end 32 of the cutting arm extends. The second end of the cutting arm is rounded to be able to rotate in the groove. The cutting arm is pivotally connected with the first housing around a pivot point 33. At the other and at the second end 34 of the piston element, the piston element extends into axis 12. When the piston is moved in the first direction, a gap 45 is created between the second end 34 of the piston element and the shaft. This space 45 is in fluid communication with the well fluid through a third channel 35, which is illustrated by a dotted line. Therefore, the piston must not exceed the pressure around the tool in the pit. The second end 34 of the piston element is provided with two circumferential seals 36 in order to seal the piston chamber from dirt from the well fluid.
    [0071] [00071] When the cutting operation is higher and the liner or drill pipe has been separated into an upper and a lower part, the hydraulic pressure from the pump is no longer fed to the first channel and the spring elements force the piston 15 in a second direction opposite the first direction along the longitudinal direction 37 of the tool, as shown in fig. two.
    [0072] [00072] When viewed in cross section, the cutting arm has an edge 38 that forms an outer point of the arm when the arm is in its projected position, and the cutting edge 10 is arranged at the end and forms the edge, so so that the cutting edge is the first part of the cutting arm to touch the inner face of the liner or drill pipe. In this way, the liner or the drill pipe can be separated from inside the liner or the drill pipe. When seen in the cross-sectional view of fig. 2, the cutting arm therefore moves from a retracted position in which the first part 39 of the arm is substantially parallel to the longitudinal direction of the tool to the projected position where the first part 39 of the arm has an angle x for the longitudinal direction of the tool. Thus, the cutting arm protrudes radially from the housing of the rotated tool. As shown in the cross-sectional view of fig. 2, the cutting arm is L-shaped, creating a part of the heel 50, and is pivotally connected around the pivot point 33 at the heel part. Thus, the cutting arm has a first end, with the cutting edge and a second end that cooperates with the piston element. Between the first and second ends, at a point of articulation, a pin 41 penetrates a hole 42 in the cutting arm.
    [0073] [00073] In the drawings, the well bottom cutting tool is shown with only one cutting arm for illustrative purposes. However, in another embodiment, the tool has three cutting arms 120 ° apart.
    [0074] [00074] The piston element is substantially coaxially arranged in the tool housing and has two peripheral seals 43, for example, sealing rings.
    [0075] [00075] In fig. 3, the piston element divides the piston chamber into the first and second sections of the chamber, but the chamber is also divided by a partitioning wall 46 of the piston housing through which the piston element extends. The chamber is divided into a third section of the chamber 47 in which the spring element is arranged. Thus, the spring element is compressed between the partitioning wall 46 and a second part of the piston 48 placed at the end of the part of the piston that extends through the partitioning wall 46.
    [0076] [00076] In fig. 3, hydraulic pressure is applied to the second chamber section, through the fourth channel 44, moving the piston element in a second direction opposite to the first direction. Thus, the functions of the spring element, as a fail-safe precaution, if the tool breaks and no hydraulic pressure can be generated when the spring element forces the cut inward, to its retracted position, and the tool can be pulled out of the well.
    [0077] [00077] In fig. 3, the cutting edge is provided with a plurality of cutting inserts so that when one is worn, the next cutting insert will be ready to further reduce the casing or drill pipe wall.
    [0078] [00078] In fig. 4, the piston chamber is divided by a partition wall 46 of the piston housing for the first 25 and second 26 sections of the chamber and the piston element extends through the wall. The piston element has a first piston part 50 on one side of the partitioning wall 46 and a second piston part 48 on the other side of the partitioning wall 46. The first part of the piston element and the partitioning wall 46, together with the piston liner they form the first chamber section 25, and the second part of the piston element and the partitioning wall 46, together with the piston housing form the second chamber part 26. The spring element 40 is arranged in the second chamber section and is therefore compressed between the partitioning wall 46 and a second part of the piston 48.
    [0079] [00079] FIG. 5 shows another embodiment of a downhole tubing cutting tool 1. Like the embodiments described above, the downhole tubing cutting tool 1 comprises a tool housing 6 having a first 7 and a second 8 parts of the housing and a cutting arm 9, being pivotally connected with the first part of the housing and having a cutting edge 10 at a first end. The arm 9 is movable between a retracted position and a projected position in relation to the tool structure. This embodiment differs from the previously described embodiments, in that the cutting arm 9 comprises a rotary cutting head 110 capable of rotating about a central axis 51 of the cutting arm. The cutting arm 9 is thus rotated about a central axis 52 of the downhole pipe cutting tool and extends in the longitudinal direction 37 of the downhole pipe cutting tool 1, while the cutting head 110 is rotated simultaneously. Thus, the cutting arm 9 is rotated at a speed of rotation about the central axis 52 of the downhole pipe cutting tool, and the cutting head is rotated at a speed of rotation about the central axis 51 of the shaft. cutting arm. The cutting head is therefore rotated about its own central axis 51 when rotated around the central axis of the tool 52.
    [0080] [00080] To rotate the rotary cutting head 110, the wellhead pipe cutting tool 1 comprises a rotary axis 12 rotated by a motor 20. The rotary axis 12 extends through the second part of the liner 8 and the the first part of the housing 7, and in the first part of the housing, the rotary axis provides a rotation input for a set of gears 53, through which the rotation of the rotary cutting head is provided. To move the cutting arm 9 between the retracted position and the projected position, the downhole pipe cutting tool 1 comprises an arm activation assembly 111.
    [0081] [00081] The gear set comprises a first gear 531 rotated by the rotary shaft 12 and a second gear 532 to which the rotary cutting head 110 is attached. When the first gear 531 is rotated by the rotary axis, the second gear 532 rotates about its own axis of rotation of the rotary cutting head 100. The rotation of the cutting arm 9 about the central axis 52 of the pipe cutting tool The bottom of the well is provided by rotating the first part of the housing 7. Thus, the second part of the housing 8 is kept stationary, while the first component of the housing 7 rotates. The first part of the housing 7 is rotated by a rotating sleeve 54 provided about the rotary axis 12. The rotating sleeve 54 is also rotated by the motor 20. The mutual rotation of the rotary axis and the rotating sleeve are adapted to provide the necessary rotation of the cutting arm 9 around its own axis 51, as well as around the central axis 52 of the downhole pipe cutting tool.
    [0082] [00082] In one embodiment, the number of teeth in the first and second gears of the gear set is the same, thus providing a ratio of 1: 1. Alternatively, the number of teeth in the second gear may be greater than that of the first gear, which thus constitutes a reduction gear.
    [0083] [00083] In an alternative embodiment, the gear set may be a planetary gear comprising a sun gear 531 rotated by the rotary axis 12 and a satellite gear 532 to which the rotary cutting head 110 is attached. When the sun gear is rotated by the rotary axis, the planetary gear rotates around its own axis to rotate the rotary cutting head 100. The gear between the rotary axis and the cutting arm can be designed in a number of other ways, without departing from the scope of the invention.
    [0084] [00084] The cutting arm 9 comprises an outer sleeve 56 and an arm shaft 57 connected with the rotary cutting head arranged inside the outer sleeve to transfer the rotation output of the second gear 532 to the rotary cutting head. The rotary cutting head is provided with a cutting edge 10. At a second end opposite the cutting edge, the cutting arm is pivotally connected to the first part of the housing 7 by a ball and socket 133. The axis of the arm 57 is rotatable about the central axis 51 and comprises a first part of the axis 571 and a second part of the axis 572. The first part of the axis 571 is coupled to the second gear of the gear set and thus rotates accordingly. In addition, the first part of the shaft 571 is coupled to the second part of the shaft 572 by means of a double Cardan joint 573 to transmit rotational force from one side of the shaft to the other, when the cutting arm is in position projected. In another embodiment, the first part of the shaft can, alternatively, be coupled to the second part of the shaft by means of a single Cardan joint, also known as a universal joint, a universal coupling, a U-joint, etc. Thus, when the cutting arm is moved into the projected position, the rotational force is transmitted from the second gear through the axis of the arms to the rotary cutting head.
    [0085] The arm activation assembly 111 comprises a piston housing 113 arranged in the first part of the body 7 and comprising a piston chamber 114. A piston element 115 is disposed within the piston chamber and engages with an activation 55 adapted to move the cutting arm 9, between the retracted position and the projected position. The piston element 115 is movable in the longitudinal direction of the downhole pipe cutting tool and has a first piston face 116. The hydraulic fluid from the hydraulic pump 21 is pumped through a first fluid channel 118 into the chamber 114, applying hydraulic pressure to the first face of the piston 116. The piston moves in a first direction, and the piston element applies a force that projects on the cutting arm 9. When the piston element moves in the first direction, a spring element 140 abuts the activation element 55 is compressed. To retract the cutting arm from the projected position (indicated by the dotted lines), the hydraulic fluid supply to the piston chamber 114 is terminated and the spring element 140 forces the piston element 115 in the second direction opposite the first direction along the longitudinal direction 37 of the tool.
    [0086] [00086] The spring element 140 can also be arranged inside the piston housing 113, thus providing a retraction force of the cutting arm. When the piston element moves in the first direction, a spring element 140 is compressed into the piston shell. To retract the cutting arm from the projected position, the hydraulic fluid supply to the piston chamber 114 is terminated and the spring element 140 forces the piston element 115 in a second direction opposite to the first direction along the longitudinal direction. 37 of the tool.
    [0087] [00087] Alternatively, the hydraulic pump 21 is provided in the second part of the housing 8 and connected to the rotating sleeve 54, according to which the hydraulic pump rotates together with the rotating sleeve and the first part of the housing 7 and the cutting arm rotates in center axis 52 of the downhole pipe cutting tool.
    [0088] [00088] In fig. 5, the activation element 115 is in the form of an L-shaped profile, of which a first end 551 engages with a recess 561 in the outer sleeve of the cutting arm 9. The first end 551 of the activation element is rounded in order to that the recess 561 is able to rotate around the first end 551 when the cutting arm is moved to the projected position. It is envisaged for the person skilled in the art that the arm activation set can be built using several other principles, without departing from the invention. The activation element can be adapted to move the cutting arm from the retracted position to the extended position only. The spring element 140 can thus be adapted to provide a retracting force directly to the cutting arm to move the cutting arm from the projected position to the retracted position. Thus, when the cutting arm is in the projected position and pressed against an internal surface of the liner or drill pipe, the simultaneous rotation of the cutting arm around axis 52 and the rotary cutting head around axis 51 allows the cut the liner or drill pipe. In this way, a first part of the liner or drill pipe above the cutting head is separated from a second part of the liner or drill pipe below the cutting head.
    [0089] [00089] In another embodiment, the downhole pipe cutting tool 1 may comprise more than one cutting arm, such as three cutting arms, extendable from the tool housing along its periphery. In this mode, each of the cutting arms is connected to a satellite gear or planetary gear, and the cutting arms are thus rotated by the solar gear. Thus, the downhole pipe cutting tool 1 consists of three activation elements 115 that allow the movement of each cutting arm between the retracted and projected positions.
    [0090] [00090] FIG. 6 shows a cross-sectional view of an alternative anchoring section 22 in addition to the anchoring section shown in fig. 1 for anchoring the second part of the housing 8 of the tool housing, in relation to the liner 2. The anchoring system 22 comprises a plurality of struts 221, which can be extended from the second part of the housing 8, as shown in fig. 6. Each of the struts 221 comprises two anchor arms 222, 223 hingedly connected at a first pivot point 230; a first anchor arm 222 hingedly connected to the second housing part 8 at a second hinge point 231 and a second anchor arm 223 hingedly connected to a piston sleeve 224 provided in a hole 226 in the second housing part 8, around the rotary axis 12. The piston sleeve 224 is thus an annular piston. The piston sleeve 224 is under the influence of a spring element 225 providing a fail-safe system ensuring that the plurality of anchors 221 is retracted, in order to be able to recover the tool, in case the energy is lost or another malfunction occurs. In fig. 6, the anchors 221 are extended, and the spring element 225 is compressed by the piston sleeve being the force in a first direction out of the cutting arm by a hydraulic fluid supplied under pressure to the piston chamber 228, thus activating, in one face of piston 227 from piston sleeve 224. When the hydraulic fluid supply is complete, pressure on the face of piston 227 reduces the spring element and moves the piston sleeve in a second direction opposite the first direction, in which anchors 221 are retracted.
    [0091] [00091] The hydraulic fluid, to move the sleeve of position 224, is provided by a hydraulic system separate from the hydraulic system used to provide the hydraulic pressure to move the cutting arm between the stowed position and the projected position. Through the use of two separate hydraulic systems, the cutting arm and anchors can be operated independently of each other. For example, the cutting arm can be retracted if problems occur during the cutting operation, without affecting the position of the downhole pipe cutting tool. Thus, the downhole pipe cutting tool remains stationary in the well, and the cutting arm can be designed once more to continue the interrupted cutting process.
    [0092] [00092] If the downhole pipe cutting tool had not been kept stationary during the cutting arm retraction, it would be difficult to determine the position of the started cutting device, and the cutting procedure would have to start again in a new one. position. When having to start over, the cutting edge or bits on the cutting arm may have been too worn out for the cutting tool to be able to cut through the coating in the new position, and the tool may therefore have to be retracted from the well to replace the cutting edge, the cutting insert or bits of the cutting arm, in order to be able to cut all through the casing.
    [0093] [00093] To ensure that the downhole pipe cutting tool does not remain anchored in the well, due to a loss of energy or malfunction of one of the hydraulic systems, the hydraulic system of the anchoring section comprises a timer to control the supply of hydraulic fluid to the hydraulic piston chamber 228. When the cutting arm is retracted, the timer records the elapsed time. Depending on the specific operating parameters, the timer can be set to retract the anchors at any time after retracting the cutting arm, preferably between 15 and 180 minutes, and more preferably between 30 and 60 minutes after retracting the cutting arm . When the programmed time has elapsed, the timer activates a valve that controls the pressure in the piston chamber 228. As the valve is activated, the pressure decreases in the piston chamber and the piston element 225 moves the piston sleeve to retract the anchors. The control of the valve comprises a battery, and the activation of the valve can be powered by the battery if the power of the cutting tool is cut off.
    [0094] [00094] The fixing arm 222 has an end surface facing the inner face of the liner when in the projected position, which is serrated to improve the ability of the fixing arm 222 to mate with the inner face of the liner.
    [0095] [00095] The pipe cutting tool comprises a second pump to drive the separate hydraulic system to activate the anchoring system. Thus, the shaft around which the piston sleeve extends may have a fluid channel for supplying fluid for projecting the cutting arm.
    [0096] [00096] The cutting edge or cutting insert is made from any suitable material, such as tungsten carbide.
    [0097] [00097] The downhole system may further comprise a drive unit, such as a downhole tractor to move the downhole pipe cutting tool forward in the casing, as shown in fig. 1. The drive unit comprises the wheels 60 arranged in the projecting wheel arms 61 from the tool housing so that the wheels 60 come into contact with an inner surface 62 of the liner 2.
    [0098] [00098] The spring element 40 can be any type element that exerts a spring force on the second face of the piston 17, such as a spiral spring, helical spring, bellows, volute spring, leaf spring, gas spring or spring of disk. The spring type can be used to design an appropriate spring force exerted on the piston element, such as a constant spring force or a spring force that increases during the projection of the arm so that the spring force maximum is obtained in the outermost arm position.
    [0099] [00099] A coating means any type of tube, tubing, tubular, lining, column, etc. used in the bottom of the well in relation to the production of oil or natural gas.
    [0100] [000100] Fluid or well fluid means any type of fluid that may be present in oil or gas wells at the bottom of the well, such as natural gas, oil, oil sludge, crude oil, water, etc. Gas means any type of gas composition present in a well, completion, or open hole, and oil means any type of oil composition, such as crude oil, a fluid containing oil, etc. Gas, oil, and water fluids can thus all comprise elements or substances in addition to gas, oil and / or water, respectively.
    [0101] [000101] Although the invention has been described above in connection with the preferred embodiments of the invention, it will be apparent to one skilled in the art that various modifications are possible, without departing from the invention as defined by the following claims.
    权利要求:
    Claims (15)
    [0001]
    Downhole pipe cutting tool (1) to submerge in a liner (2) or drill pipe (2) in a well (3) and separate an upper part (4) of the liner from a lower part (5) of the coating by cutting the coating from the inside, the tool extending in a longitudinal direction, comprising: - a tool housing (6) having a first (7) and a second (8) part of the housing, - a cutting arm (9), which is pivotally connected with the first part of the housing and has a cutting edge (10) at a first end (10), said arm being movable between a retracted position and a position projected in relation to the tool structure, - an arm activation assembly (11) for moving the cutting arm between the retracted position and the projected position, and - a rotary axis (12) arranged in the second part of the housing and connected with the first part of the housing, to rotate the cutting arm, characterized by the fact that the activation arm assembly comprises: a piston housing (13), arranged in the first part of the housing and comprising a piston chamber (14), and a piston element (15) disposed within the piston chamber and engaged with the cutting arm to move the cutting arm between the retracted position and the projected position, the piston element being movable in the longitudinal direction of the bottom tool of well and having a first piston face (16) and a second piston face (17), the piston element being able to apply a force that projects on the cutting arm by applying hydraulic pressure on the first piston face and moving the piston in a first direction (18).
    [0002]
    Downhole pipe cutting tool according to claim 1, characterized by the fact that the piston chamber is divided into a first chamber section (25) and a second chamber section (26), and the pressure hydraulic on the first face of the piston, moving the piston in a first direction, is applied to the first section of the chamber.
    [0003]
    Downhole pipe cutting tool according to claim 2, characterized by the fact that hydraulic pressure is applied to the second chamber section, thus moving the piston element in a second direction opposite to the first direction.
    [0004]
    Downhole pipe cutting tool according to claim 2 or 3, characterized by the fact that the chamber is divided by the piston.
    [0005]
    Downhole pipe cutting tool according to claim 2 or 3, characterized in that the chamber is divided by a partitioning wall (46) of the piston housing through which the piston element extends.
    [0006]
    Downhole pipe cutting tool according to any one of claims 1 to 5, characterized by the fact that a spring element (40) is arranged in the first part of the housing by applying a spring force to dislodge the spring element piston in a second direction opposite the first direction.
    [0007]
    Downhole pipe cutting tool according to claim 6, characterized by the fact that the spring element is disposed in the second chamber section.
    [0008]
    Downhole pipe cutting tool according to any one of claims 1 to 7, characterized in that the piston element has a groove (31) that cooperates with a second end (32) of the cutting arm.
    [0009]
    Downhole pipe cutting tool according to any one of claims 1 to 8, characterized by the fact that it also comprises an anchor section (22) for anchoring the second housing part in the lining.
    [0010]
    Downhole pipe cutting tool according to any one of claims 1 to 9, characterized in that the cutting arm in the cross section has an edge (38) that forms an outer point of the arm when the arm it is in its projected position, and the cutting edge is arranged on that edge that forms the edge.
    [0011]
    Downhole pipe cutting tool according to any one of claims 1 to 10, characterized in that it further comprises a gear section (23).
    [0012]
    Downhole pipe cutting tool according to any one of claims 1 to 11, characterized in that it further comprises a rotation unit (20), such as, for example, an electric motor or a hydraulically driven impeller .
    [0013]
    Downhole pipe cutting tool according to any one of claims 1 to 12, characterized in that the cutting arm is L-shaped, creating a part of the heel (50), and is connected in a way articulated around the pivot point (33) on the heel.
    [0014]
    Downhole pipe cutting tool according to any one of claims 1 to 13, characterized in that it further comprises a pump (21) for supplying hydraulic pressure.
    [0015]
    Downhole system, characterized by the fact that it comprises: a downhole pipe cutting tool as defined in any one of claims 1 to 14, and a drive unit (51) for moving the downhole pipe cutting tool towards the casing.
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    同族专利:
    公开号 | 公开日
    EP2530238B1|2013-12-25|
    CN103562488B|2016-08-17|
    US9441436B2|2016-09-13|
    CA2837958C|2019-06-11|
    AU2012264685A1|2013-05-02|
    WO2012164023A1|2012-12-06|
    US20140124191A1|2014-05-08|
    MX2013013914A|2013-12-16|
    DK2530238T3|2014-02-10|
    RU2013156840A|2015-07-10|
    MY172039A|2019-11-12|
    MX356784B|2018-06-13|
    RU2595028C2|2016-08-20|
    EP2530238A1|2012-12-05|
    BR112013030443A2|2016-09-27|
    CN103562488A|2014-02-05|
    CA2837958A1|2012-12-06|
    AU2012264685B2|2015-02-19|
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    法律状态:
    2018-12-11| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2019-11-19| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2020-12-01| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2021-02-17| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 31/05/2012, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    EP11168242.3A|EP2530238B1|2011-05-31|2011-05-31|Downhole tubing cutter tool|
    EP11168242.3|2011-05-31|
    PCT/EP2012/060255|WO2012164023A1|2011-05-31|2012-05-31|Downhole tubing cutter tool|
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