• 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:
    TRACTION TOOL. The invention relates to a pull tool (1) engaging an object (30) as a plug, in a downward hole in a well hole. The traction tool comprises a base element (10) extending in a longitudinal direction from a proximal end (10a) being connected to a wire line tool to a distal end (10b) adapted by engaging the object , and an engaging mechanism (13) surrounding the base element and being movable in the longitudinal direction between a deactivated position and an activated position, comprising a piston sleeve (14), a key element (17) engaging the object downward hole, the key element being slidably received into the piston sleeve and extending from one end of the piston sleeve to the distal end of the base element and a piston spring (16a) forcing the piston sleeve in the direction longitudinal to the proximal end of the base element. In addition, the present invention relates to a downhole recovery system by pulling an object into a well hole and a method of connecting and disconnecting the recovery system to a downhole object.
    公开号:BR112014011686B1
    申请号:R112014011686-5
    申请日:2012-11-29
    公开日:2020-11-24
    发明作者:Jorgen Hallundbaek；Steffen Evertsen；Rasmus Sommer
    申请人:Welltec A/S；
    IPC主号:
    专利说明:

    [0001] [001] The present invention relates to a traction tool engaging an object, such as a plug, in the downward hole in a well hole. In addition, the present invention relates to a well bore and a method of connecting and disconnecting such a retrieval system to an object of the downhole. BACKGROUND OF THE TECHNIQUE
    [0002] [002] Known down hole pull tools are often entirely mechanical tools, in which a mechanical locking mechanism is used to provide a rigid connection between the pull tool and an object to be recovered, such as down hole plugs, tools , etc. The mechanical locking mechanism often comprises locking means such as keys, holders or fingers, which extend from the body of the pull tool to engage a recess, also indicated as a neck to pass an object to be recovered. The locking means are usually locked in said neck to pass objects to the surface by applying a pulling force to the pulling tool, and subsequently the object can be pulled out of the well.
    [0003] [003] Tools or plugs installed in a well often develop some kind of anchoring mechanism that has to be released before they can be pulled out of the well. This anchoring mechanism can be disengaged by applying a pulling or pulling force to the tool or plug, whereby a shear pin is broken. When the shear pin breaks, the anchoring mechanism is automatically recovered or disengaged. However, in some cases, the anchoring mechanism may run aground or it may not be possible to pull the tool or plug out of the pit for other reasons. In those cases, the pull tool requires a fail-safe mechanism that ensures that the connection between the pull tool and the object to be recovered can be detached from the detached down hole. In known traction tools, such fail-safe mechanisms often consist of a shear pin or other locking member. If the traction tool becomes stranded, the shear pin can be broken by bouncing down on the GS traction tool, that is, by applying a driving force to the traction tool, whereby the mechanical locking mechanism is disengaged and the pull tool is detached from the tool in the well and recovered to the surface. One of the disadvantages of known traction tools is that the tools are damaged or become inoperable following the activation of the fail safe mechanism. SUMMARY OF THE INVENTION
    [0004] [004] It is an objective of the present invention to totally or partially remove the above mentioned disadvantages and defects of the prior art. More specifically, it is an objective to provide an improved traction tool and a recovery system having a reliable disengagement system.
    [0005] [005] The above objectives, together with numerous other objectives, advantages and aspects, which will become evident from the description below, are realized by a solution according to the present invention, by a traction tool to engage an object, such as a plug, from the downward hole into a well hole, comprising:
    [0006] [006] -a base element extending in a longitudinal direction from a proximal end to be connected to a thread tool to a distal end adapted to engage the object, and
    [0007] [007] -a coupling mechanism surrounding the base element and being movable in the longitudinal direction between a disabled position and an activated position, comprising:
    [0008] [008] -a piston sleeve,
    [0009] [009] -a key element for engaging the downhole object, the key element being slidably received inside the piston sleeve and extending from one end of the piston sleeve to the distal end of the base element , and
    [0010] [0010] -a piston spring forcing the piston sleeve in the longitudinal direction towards the proximal end of the base element,
    [0011] [0011] in which the engagement mechanism is adapted to engage the object of the downhole when it is being activated by supplying a hydraulic fluid via a fluid channel extending from the proximal end of the base element to an expandable piston chamber which it is at least partially defined by a piston sleeve, whereby the engagement mechanism is movable from the deactivated position to the activated position and the engagement mechanism is adapted to be disengaged from the object of the downhole when the fluid supply is terminated, at least that the coupling mechanism can now be moved from the activated position to the position deactivated by the piston spring.
    [0012] [0012] The traction tool being activated by the hydraulic fluid supply causes the traction tool to be inversely deactivated when the hydraulic fluid supply is terminated. The pull tool thus has a passive failure safety system, meaning that the pull tool can always be disengaged when in a deactivated or passive state and the pull tool must be activated to be operable. If, for example, the hydraulic system fails, the drive tool can always be disengaged.
    [0013] [0013] In one embodiment, the key element may comprise a plurality of flexible arms in a radial direction, the arms having protrusions at a distal end to engage a recess of the downhole object.
    [0014] [0014] In addition, the base element can be adapted to allow flexing into the arms when the coupling mechanism is in the deactivated position.
    [0015] [0015] A section of the base element, adjacent to the distal end of the arms when the engagement mechanism is in the deactivated position, may have a reduced diameter, so that the plurality of arms is flexible inwardly, when the mechanism hitch is in the off position.
    [0016] [0016] In addition, the coupling mechanism can be activated by supplying a hydraulic fluid to the expandable piston chamber at a flow rate of 0.1 - 1.0 liter / minute, preferably 0.2 - 0.4 liter /minute.
    [0017] [0017] The traction tool can thus be activated using a very low volumetric flow of hydraulic fluid in comparison to known traction tools, such as coiled pipe traction tools that demand a flow rate of approximately 160 liters / minute.
    [0018] [0018] Also, the key element can be slidable in the longitudinal direction to the proximal end of the base element, when the latching mechanism is in the activated position and the base element can be adapted to allow flexion into the arms, when the key element is moved to the proximal end of the base element.
    [0019] [0019] In another embodiment, the key element can be slidable in the longitudinal direction towards the proximal end of the base element, when the engagement mechanism is in the activated position, so that the arms can be moved towards the proximal end of the base element and curved inward due to the reduced diameter of a section of the base element.
    [0020] [0020] Furthermore, the base element can comprise a projecting flange adjacent to the distal end to pin the plurality of arms of the key element under pins, when the engagement mechanism is in the activated position, the flange preventing movement radial inward straight.
    [0021] [0021] Additionally, the base element may comprise a protrusion adjacent to the distal end, thereby restricting the longitudinal movement of the key element beyond the protrusion.
    [0022] [0022] The arms of the key element can be restricted from flexing inward by the flange and restricted from movement in the longitudinal direction by the protrusion of the base element in one direction and by the protrusions in the arms of the key element being secured in the recess of the object of down hole in the other direction. Therefore, the connection between the draw tool and the downhole object is mechanically locked when the draw force is applied to the draw tool. When the downhole object is being pulled from the well, it is therefore not necessary to continuously supply the hydraulic fluid to the draw tool to maintain the connection between the draw tool and the down hole object, provided that a constant draw force is applied to the traction tool.
    [0023] [0023] The piston spring can thus force the piston sleeve in a direction opposite to the direction in which the hydraulic fluid forces the piston sleeve, thereby providing a fail-safe system that ensures that the engagement mechanism is forced into the position deactivated if hydraulic pressure is lost and tension on the pull tool is removed.
    [0024] [0024] Also, the piston spring can connect the piston sleeve and the base element, thus displacing the piston sleeve in relation to the base element.
    [0025] [0025] Also, the piston chamber can be defined by the base element and the piston sleeve.
    [0026] [0026] The locking mechanism may further comprise a key spring forcing the key element in the longitudinal direction towards the proximal end of the base element.
    [0027] [0027] In addition, the key spring can contact the piston sleeve and a proximal end of the key element, thereby forcing the key element in the longitudinal direction towards the distal end of the base element.
    [0028] [0028] Furthermore, the base element can comprise an upper base element and a lower base element that are threadedly connected.
    [0029] [0029] The present invention also relates to a downhole recovery system for pulling an object into a well hole, comprising:
    [0030] [0030] -a pull tool for engaging an object in the downward hole, such as a plug, and
    [0031] [0031] -a hydraulic system for supplying hydraulic fluid to the traction tool,
    [0032] [0032] wherein the pull tool is a pull tool as described above.
    [0033] [0033] Such a recovery system may further comprise a motor to drive the hydraulic system, a compensating unit for supplying a fluid to the recovery system to provide excess pressure within the recovery system compared to the surrounding ones, and an electronic section to energize and control the recovery system.
    [0034] [0034] The downhole recovery system as described above may further comprise:
    [0035] [0035] - a hammer tool to provide a force in an axial direction comprising:
    [0036] [0036] -a hydraulic system driven by a motor,
    [0037] [0037] -a percussion cylinder, and
    [0038] [0038] -a hydraulic piston rod driven by the hydraulic system and movable in the axial direction on the percussion cylinder, the piston rod being connected with the traction tools and with the first hydraulic system mentioned.
    [0039] [0039] Furthermore, the downhole recovery system as described above may comprise:
    [0040] [0040] -a percussion cylinder, and
    [0041] [0041] -a movable hydraulic piston rod in axial direction on the percussion cylinder,
    [0042] [0042] in which the traction tool is mounted on the piston rod and the hydraulic system supplies the hydraulic fluid to both the traction tool and the percussion cylinder to drive the hydraulic piston rod in the axial direction and to the traction tool.
    [0043] [0043] By using a common hydraulic system and mounting the traction tool on a piston rod, the total length of the recovery system can be reduced when compared to systems using separate hydraulic systems for the striking cylinder and traction tool. This is advantageous when the extension of the tool series, that is, the total extension of the recovery system and the object to be recovered, is often a limiting factor. The total length of the tool series is limited by the pressure rupture inhibitor (BOP) since the length of the tool series cannot exceed the length between the BOP safety valves.
    [0044] [0044] The downhole recovery system as described above can also comprise a drive unit to drive the recovery system all the way forward in the slope sections of a well hole.
    [0045] [0045] Finally, the present invention relates to a method of connecting and disconnecting the recovery system as described above to / from a descending hole object, comprising the steps of:
    [0046] [0046] -activate the traction tool by supplying a hydraulic fluid to the traction tool, whereby the coupling mechanism is moved in the longitudinal direction,
    [0047] [0047] -engage the traction tool on the object,
    [0048] [0048] -proving a pulling force on the pulling tool,
    [0049] [0049] - terminate the supply of hydraulic fluid to the traction tool, and
    [0050] [0050] - disengage the object's pull tool.
    [0051] [0051] In said method, the step of engaging the pull tool on the object can comprise the steps of:
    [0052] [0052] -Insert the distal end of the pull tool into the down hole object until the key element contacts the down hole object,
    [0053] [0053] -forcing the traction tool more towards the object of downward hole, whereby the key element is forced to the proximal end of the base element, thus compressing the key spring and the arms enter a position that allows an inward bending, and
    [0054] [0054] -move the traction tool further to the object of the descending hole, so that the projections on the arms of the key element pass through a neck to pass objects to the surface of the descending hole and enter the recess of the object of the descending hole. BRIEF DESCRIPTION OF THE DRAWINGS
    [0055] [0055] The invention and its many advantages will be described in greater detail below with reference to the attached schematic drawings, which for the purpose of illustration show some non-limiting embodiments and in which:
    [0056] [0056] Figure 1a shows a traction tool in the deactivated state,
    [0057] [0057] Figure 1b shows a traction tool in the activated state,
    [0058] [0058] Figures 2a and 2b show a traction tool engaging a recess in an object of the descending hole,
    [0059] [0059] Figure 3 shows a recovery system.
    [0060] [0060] Figure 4 shows another recovery system, and
    [0061] [0061] Figure 5 shows a well hole with a downward hole unfolded from the recovery system.
    [0062] [0062] All figures are highly schematic and not necessarily to scale and they show only those parts that are necessary in order to elucidate the invention, other parts being omitted or merely suggested. DETAILED DESCRIPTION OF THE INVENTION
    [0063] [0063] Figures 1a and 1b show a pull tool 1 in a deactivated state and an activated state, respectively. The traction tool 1 comprises a base element 10 extending in a longitudinal direction, from a proximal end 10a to be connected to a threaded tool to a distal end 10b adapted to engage an object from the downhole. The proximal end of the traction tool 1 can alternatively be connected to a coiled pipe tool, coiled pipe or a series of drill rigs for insertion into the well. The pull tool 1 further comprises a locking mechanism 13 surrounding the base element 10 and being movable in the longitudinal direction between a deactivated position as shown in figure 1a and an activated position as shown in figure 1 b.
    [0064] [0064] The engagement mechanism 13 comprises a piston sleeve 14 slidably received around the base element 10. The piston sleeve 14 thus constitutes an external ring piston movable in the longitudinal direction along the base element 10. The The locking mechanism further comprises a key element 17 for engaging an object of the downhole. The key element 17 extends from one end of the piston sleeve 14 to the distal end 10b of the base element 10. In addition, the key element 17 is slidably received within the piston sleeve part 14 and is slidable in relative to the base element 10.
    [0065] [0065] In one embodiment, the base element 10 can comprise an upper base element 11 and a lower base element 12 which are threadedly connected via a thread 20.
    [0066] [0066] Also, in one embodiment, the piston sleeve 14 comprises a piston part 15a and a sleeve part 15b which are rigidly connected. The piston part 15a slidably contacts the base element 10 and sealing elements 141 provides a fluid tight seal between the piston part 15a and the base element 10. Furthermore, the piston part 15a has a bore 142 of increased diameter and the piston part 15a thus surrounds a section of the base element 10 having a correspondingly increased outside diameter. Here, the base element 10 and the piston part 15a define an expandable piston chamber 22 to which the hydraulic fluid is supplied via a fluid channel 21 extending from the proximal end 10a of the base element 10. The hydraulic fluid supplied to the piston chamber 22 exerts a force on a face 143 of the piston part 15a, whereby the piston part and then the piston sleeve 14 is displaced in the longitudinal direction with respect to the base element 10 until the engagement mechanism is in the activated position, as shown in figure 1b. In addition, the piston chamber 22 is expanded from the initial volume shown in figure 1a to the volume shown in figure 1b. The sleeve part 15b of the piston sleeve 14 extends from the piston part 15a to the distal end 10b of the base element 10, thereby providing a housing for a piston spring 16a and a key spring 16b of the engagement mechanism , as will be described below.
    [0067] [0067] The piston spring 16a is arranged around the base element 10 and one end of the piston spring 16a contacts the base element and the opposite end on the piston part 15a. Here, the piston spring 16a forces the piston sleeve in the longitudinal direction towards the proximal end 10a of the base element. By having a piston spring 16a forcing the piston sleeve in a direction opposite to the direction in which the hydraulic fluid forces the piston sleeve, a fail-safe system is provided ensuring that the engagement mechanism is forced into the deactivated position if the hydraulic pressure is lost and the tension in the traction tool 1 is removed. The fail-safe system will be further detailed below.
    [0068] [0068] The key spring 16b contacts a face of the piston part 15a and at a proximal end of the key element 17, thereby forcing the key element 17 to separate from the piston part. In one embodiment, the key element comprises a plurality of arms 173 flexible in a radial direction. The arms 173 extend in a longitudinal direction of the key element 17 and are adapted to bend inwardly to the base element 10. The arms comprise protrusions 175 at a distal end 172 to engage a recess 32 of a downward hole in the object 30, as illustrated in figures 2a and 2b and described in greater detail below.
    [0069] [0069] The base element 10 is constructed in such a way that the arms 173 can bend or flex inward when the engagement mechanism is in the deactivated position. A section 101 of the base element has a reduced diameter, so that the plurality of arms are internally flexible when the engagement mechanism is in the deactivated position. The reduced diameter section 101 ends at the distal end of the base element on a projecting flange 18 having a diameter that is substantially equal to an internal diameter of the key element 17. When the engagement mechanism 13 is in the activated position, the end distal of the key element 17 surrounds the projecting flange 18, and the arms 173 will thus be carelessly fixed with pin underneath or supported on the flange 18. Here, the arms 171 are restricted from bending directly inward and are thus locked in the radial direction . However, if the key element and thus the arms 173 are forced in the longitudinal direction towards the piston part 15a, that is, backwards in relation to the base element, thereby compressing the key spring 16b, the arms will eventually come into contact. a position that allows inward flexion. As soon as the arms 173 are free of the projecting flange 18, the inward bending is no longer restricted and the arms 173 can bend when subjected to an external compressive force. In use, this typically occurs when the pull tool 1 is in the process of engaging an object with a downward hole, as shown in figures 2a and 2b. The key element 17 contacts the neck to pass objects to the surface of the down hole, and when moving the draw tool further to the down hole object, the key element 17 is forced to the proximal end of the down element. base, so that the arms enter a position that allows inward flexion. Here, the protrusions 175 at the distal end of the arms 173 are able to pass through the neck to pass objects to surface 31 and be arranged within the object of the descending hole as shown in figure 2b.
    [0070] [0070] At a distal end of the flange 18, the base element 10 comprises a protrusion 19 providing a longitudinal movement to restrict the stop of the key element 17 beyond a certain position. When the pull tool 1 is connected with a downhole object and a pull force is applied, the arms 173 of the key element 17 are thus restricted from bending inwardly by the flange 28 and restricted from moving in the longitudinal direction by the protrusion 18 in one direction and by the weight of the object acting in the other direction in the protrusions 175 of the arms 173. Here, the connection between the drawing tool 1 and the object is mechanically locked.
    [0071] [0071] In use, the pull tool 1 is part of a downhole 40 recovery system for pulling an object into a well hole as shown in figure 3. The recovery system shown in figure 3 comprises a tool section drive 60, a hammer tool 50 and a drive unit 70 such as a downhole tractor. The traction tool section 60 comprises a hydraulic system 61 for supplying hydraulic fluid to the traction tool 1, a motor 62 driving a hydraulic system pump, a compensating unit 63 for supplying a fluid to the tool section to provide a pressure in excess within the tool section compared to the surrounding ones and an electronic section 64 to provide power and control functions. The traction tool section 60 is connected to a hydraulic piston rod 51 of the impact tool 50 providing a force or impact in an axial direction. The hydraulic piston rod 51 extends from a hammer cylinder 52 and is driven by a hydraulic system 54. The hammer tool 50 still comprises a motor 55 that drives the hydraulic system, an anchor section 53 for anchoring the hammer tool and the locking system. well hole, and an electronic section 56 and a compensator 57 similar to that of the pull tool section 60. If the recovery system 40 is arranged in an inclined well hole 80, the recovery system may comprise a drive 70 to drive the recovery system all the way forward in sloping sections of a well bore 80. The drive unit can be of the type of the downhole tractor that provides a forward movement by means of multiple drive wheels 71 that extend to the borehole side of well 80. The wheels can be driven by a hydraulic system and provide the necessary traction to ensure propulsion of the downward bore of the system recovery. As an alternative to the force generated by the hammer tool 50, the drive unit 70 can be used to apply a pulling force to the drive tool 1. The drive unit 70 can also be used in combination with the hammer tool 50 for supply necessary tractive force.
    [0072] [0072] Figure 4 shows another embodiment of a recovery system in which the traction tool 1 is mounted on the hydraulic piston rod 51 movable in the axial direction on the percussion cylinder 52. In this embodiment, the hydraulic system 54 supplies the hydraulic fluid to both, to the traction tool 1 to provide necessary activation of the coupling mechanism 13 and to the hammer cylinder to drive the hydraulic piston rod 51 in the axial direction. Otherwise, the striking tool 50 is substantially similar to the striking tool described above in connection with the previous embodiment.
    [0073] [0073] Figure 5 shows a downhole 40 recovery system suspended in a well bore 80 on a wire line 75. In use, the recovery system can be mounted on the well surface and in the required units and section of tool can be included in tools in series according to specific needs. In order to pull an object from the downhole, the recovery system is inserted into the well hole 80 and moved to the downhole at the desired location.
    [0074] [0074] Before engaging an object 30, such as a down-hole plug, tool, etc., the hydraulic fluid under pressure is supplied to the traction tool, whereby the traction tool is activated and the engagement mechanism 13 moves move to the activated position as shown in figure 1b. Subsequently, the pull tool is engaged with the object by moving the pull tool to engage the object, e.g., to engage with a neck to pass objects to surface 31 as shown in figures 2a and 2b. When the traction tool moves into engagement with the object, the arms 171 of the key element 17 are forced backward by the object until they bend inwardly to section 101 of the base element 10 of the traction tool having a reduced diameter . Therefore, a front end of the pull tool enters the object. When the distal end 172 of the key element reaches a recess 32 in the object, the arms 171 of the key element 17 curve outward and slide into the projecting flange 18 due to the force of the key spring 16b shown in figure 1b. Therefore, the protrusions 175 of the arms 171 engage a recess 32 in the object and the arms 171 rest on the protrusion 18 of the base element 10 as shown in figure 2b. Subsequently, a pulling force can be provided to pull the object.
    [0075] [0075] The pulling force can be applied using the hammer tool 50, the drive unit 70 or a combination of the two. For the hammer tool 50 to provide a pulling force, the anchor section 53 is activated, whereby a plurality of anchors 531 engage the bore side of the well 80 in order to restrict the movement of the recovery system 40 in the bore of the well 80 , as shown in figure 5. When a pulling force is applied to the pulling tool, the connection between the pulling tool and the object is mechanically locked by the mutual interaction of the flange 18 and the protrusion 19 of the base element 10 and the protrusions 175 in arms 172, as described above. This mechanical locking arrangement is not dependent on the constant supply of hydraulic fluid and hydraulic pressure on the drive tool. The supply of hydraulic fluid to the pull tool is therefore not necessary when the object to be pulled is being pulled out of the well, except that a constant pull force is applied to the pull tool. Consequently, the hydraulic fluid supply can be interrupted when a pulling force is applied to the recovery system. Similarly, if the hydraulic systems fail unintentionally, the connection between the pull tool and the object to be pulled is not disengaged.
    [0076] [0076] If the object for some reason cannot be pulled or immobilized during the recovery of the well, the connection can be disengaged. In order to disengage the pull tool, the supply of hydraulic fluid to the expandable piston chamber 22 is terminated, whereby the hydraulic pressure in the piston part 15a decreases. The piston spring 16a will then attempt to force the piston sleeve 14 and the key element 17 in the opposite direction to the close end 10a of the base element 10. Since the key element 17 is mechanically locked in the immobilized object, the base element 10 will move further towards the immobilized object 30, except that the tension in the traction tool is released. When the arms 173 of the key element are in a position that allows inward bending, the pull tool can be removed from the immobilized object as arm bends 173 inward to disengage the connection between the pull tool 1 and the object 30. Subsequently , the traction tool and the recovery system can be removed from the well.
    [0077] [0077] The functionality described above involves a fail safe system or mechanism in which the traction tool can always be disengaged from the object to be pulled from the down hole. If, for example, hydraulic systems fail or communication between the recovery system and an operator on the surface is lost, it will always be possible to disengage the drive tool.
    [0078] [0078] To prevent unintentional interruption in the supply of hydraulic fluid, the recovery system may comprise an accumulator or battery to energize the hydraulic system 54, 61 in the event of a power failure. However, such a system may also require that the supply of hydraulic fluid to the traction tool be continued unintentionally, for example if communication with the recovery system is lost and the hydraulic systems could not be manually controlled. Consequently, the recovery system may comprise a timer set to interrupt the supply of hydraulic fluid after a predetermined period of time. To prevent the stopwatch from unintentionally interrupting the supply of hydraulic fluid after a power failure, the recovery system may also comprise means for detecting changes in the current in the wire line. If no current is detected, the accumulator or battery is turned on and is turned off again when the power returns. In addition, the detection means can provide a reset signal to the timer when it detects the current in the wire line, so the timer is reset.
    [0079] [0079] In one embodiment, the stopwatch is an electric stopwatch, but it can also be a mechanical stopwatch. The detection means is a non-contact means such as a pick-up, a coil, a capacitor, a hall element or the like. In another embodiment, the detection means can be a voltmeter or the like being in contact with the current in the wire line or any other wires in the downhole system.
    [0080] [0080] Fluid or well fluid means any type of fluid that may be present in the downstream holes of oil or gas wells such as natural gas, oil, oil sludge, crude oil, water, etc. By gas we mean any type of gas composition present in an open well, finish or bore, and by oil we mean any type of oil composition, such as crude oil, a fluid containing oil, etc. The fluids of gas, oil and water can thus all comprise other elements or substances than gas, oil and / or water, respectively.
    [0081] [0081] An enclosure means any type of steel pipe, tubing, tubular, lining, cord, etc., downward hole used in relation to the production of oil or natural gas.
    [0082] [0082] In the event that the tools are not submersible in any way in the casing, a down-hole tractor can be used to propel the tools in any way to position in the well. A downhole tractor is any type of driving tool capable of pushing or pulling tools into a downhole hole such as WELL TRACTOR®.
    [0083] [0083] Although the invention has been described above in connection with the preferred embodiments of the invention, it will be apparent to a person skilled in the art that various modifications are conceivable without departing from the invention, as defined by the following claims.
    权利要求:
    Claims (13)
    [0001]
    Traction tool (1) for engaging an object (30), such as a plug, a downward hole in a well hole, comprising: a base element (10) extending in a longitudinal direction from a proximal end (10a) to be connected to a thread tool to a distal end (10b) adapted to engage the object, and an engagement mechanism (13) surrounding the base element and being movable in the longitudinal direction between a deactivated position and an activated position comprising: a piston sleeve (14), and a key element (17) for engaging the down-hole object, the key element being slidably received into the piston sleeve and extending from one end of the piston sleeve to the distal end of the base element, and characterized by the fact that it also comprises: a piston spring (16a) forcing the piston sleeve in the longitudinal direction towards the proximal end of the base element, wherein the engagement mechanism is adapted to engage the down-bore object when it is being activated by supplying a hydraulic fluid via a fluid channel (21) extending from the proximal end of the base element to an expandable piston chamber ( 22) which is at least partially defined by the piston sleeve, whereby the coupling mechanism is movable from the deactivated position to the activated position and the coupling mechanism is adapted to be disengaged from the down hole object when the hydraulic fluid supply is finished, so the coupling mechanism can be moved from the activated position to the position deactivated by the piston spring.
    [0002]
    Traction tool according to claim 1, characterized in that the key element comprises a plurality of arms (173) flexible in a radial direction, the arms having protrusions at a distal end (172) to engage a recess (32 ) of the downhole object.
    [0003]
    Traction tool according to claim 2, characterized by the fact that the base element is adapted to allow flexing into the arms when the coupling mechanism is in the deactivated position.
    [0004]
    Traction tool according to claim 3, characterized in that the key element is slidable in the longitudinal direction towards the proximal end of the base element when the engagement mechanism is in the activated position and the base element is adapted to allow a flexion into the arms when the key element is moved towards the proximal end of the base element.
    [0005]
    Traction tool according to any one of claims 1 to 4, characterized in that the base element comprises a projecting flange (18) adjacent to the distal end to fix the plurality of arms of the key element with pins underneath, when the engagement mechanism is in the activated position, the flange preventing direct inward radial movement.
    [0006]
    Traction tool according to any one of claims 1 to 5, characterized in that the base element still comprises a protrusion (19) adjacent to the distal end, thereby restricting the longitudinal movement of the key element beyond the protrusion.
    [0007]
    Traction tool according to any one of claims 1 to 6, characterized in that the engagement mechanism further comprises a key spring (16b) forcing the key element in the longitudinal direction towards the proximal end of the base element.
    [0008]
    Downhole recovery system (40) for pulling an object into a well hole characterized by the fact that it comprises: a pull tool for engaging an object (30) from the down hole such as a plug, and a hydraulic system (61) for supplying hydraulic fluid to the traction tool, wherein the traction tool is a traction tool as defined in any one of claims 1 to 7.
    [0009]
    Downhole recovery system (1) according to claim 8, characterized by the fact that it still comprises: a hammer tool (50) to provide a force in an axial direction comprising: a hydraulic system (54) driven by a motor (55), a percussion cylinder (52), and a hydraulic piston rod (51) driven by the hydraulic system and movable in the axial direction on the percussion cylinder, the piston rod being connected with the traction tool and the first hydraulic system mentioned.
    [0010]
    Downhole recovery system (1) according to claim 9, characterized by the fact that it still comprises: a percussion cylinder (52), and a hydraulic piston rod (51) movable in the axial direction on the strike cylinder, where the traction tool is mounted on the piston rod and the hydraulic system supplies the hydraulic fluid to both the traction tool and the percussion cylinder, to drive the hydraulic piston rod in the axial direction and to the traction tool.
    [0011]
    Downhole bore recovery system (1) according to any one of claims 8 to 10, characterized in that it further comprises a drive unit for driving the recovery system all the way forward in the slope sections of a well bore.
    [0012]
    Method of connecting and disconnecting the recovery system as defined in any one of claims 8 to 10, of an object of the descending hole, characterized by the fact that it comprises the steps of: activate the traction tool by supplying a hydraulic fluid to the traction tool, whereby the coupling mechanism (13) is moved in the longitudinal direction, engage the pull tool on the object, provide a pulling force on the pulling tool, terminate the supply of hydraulic fluid to the traction tool, and disengage the object's pull tool.
    [0013]
    Method according to claim 12, characterized by the fact that the step of engaging the pull tool on the object comprises the steps of: insert the distal end of the pull tool into the down hole object until the key element contacts the down hole object, force the pull tool further in the direction of the downward bore object, whereby the key element is forced to the proximal end of the base element, thereby compressing the key spring and the arms enter a position that allows inward bending , and move the pull tool further in the direction of the downward hole object, so that the projections on the arms of the key element pass through a downward neck of the downward hole object and enter the recess of the downward hole object.
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    同族专利:
    公开号 | 公开日
    US9695658B2|2017-07-04|
    DK2785959T3|2016-11-07|
    BR112014011686A2|2017-07-11|
    AU2012343912A1|2014-07-10|
    AU2012343912B2|2015-11-05|
    CN104024563B|2017-05-03|
    US20140311757A1|2014-10-23|
    RU2606473C1|2017-01-10|
    MY172340A|2019-11-21|
    CA2856166A1|2013-06-06|
    EP2785959B1|2016-07-20|
    WO2013079573A1|2013-06-06|
    MX2014005901A|2014-06-05|
    MX354497B|2018-03-08|
    EP2785959A1|2014-10-08|
    IN2014CN04494A|2015-09-11|
    CN104024563A|2014-09-03|
    EP2599952A1|2013-06-05|
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    法律状态:
    2018-12-04| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2019-12-03| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2020-07-28| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2020-11-24| 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 29/11/2012, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    EP11191285.3A|EP2599952A1|2011-11-30|2011-11-30|Pulling tool|
    EP11191285.3|2011-11-30|
    PCT/EP2012/073915|WO2013079573A1|2011-11-30|2012-11-29|Pulling tool|
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