• 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:
    CENTRALIZER A centralizer comprises a centralizer body (2) to be placed on the outer surface of a column of tubes (1) in the form of lining, lining, or the like, used during drilling, the centralizer being formed with a plurality of centralizer blades external (4), arranged inclined to its longitudinal axis, in which the centralizer body (2) has a separate divided inner tube (8) attached to a column of tubes (1) by means of a pressure fitting, and a low friction inner surface of the centralizing body (2) and a separate central tube (9) facing each other are made of a low friction material.
    公开号:BR112013016844B1
    申请号:R112013016844-7
    申请日:2011-01-07
    公开日:2021-01-05
    发明作者:Morten Eidem；Tore Weltzin；Gaute Grindhauq；Jafar Abdollahi
    申请人:Statoil Petroleum As；
    IPC主号:
    专利说明:

    TECHNICAL FIELD
    [0001] The present invention relates to a centralizer during drilling and, in particular, to a centralizer for drilling operations by means of a column of tubes, in the form of a liner, lining. TECHNICAL FUNDAMENTALS
    [0002] There are several different centralizers on the market today, most of which were designed for the traditional descent of cladding and lining and are not intended for drilling operations using them.
    [0003] When descending a coating or lining into a borehole, centralizers are used to improve cementing operations and also to reduce friction during these operations. When drilling with centralizers, the centralizer must also protect the pipe column against wear. Low friction due to rotation and descent become increasingly important, as the horizontal displacement increases and drilling with a liner and coating becomes a usual technique.
    [0004] Current technologies have a wide assortment of designs and components, but the challenges of drilling with centralizers in the pipe column were not adequately taken into account during construction. This means that the equipment currently available on the market can generate frictional forces between the liner and the borehole that are too large for a drilling application, even with the use of centralizers. Current equipment may also raise concerns about the wear and integrity of a rotating tube column over time.
    [0005] In order to meet future demands in the construction of a well, there is a need for a centralizer that: provides low resistance to rotation and sliding; protect the tube column against external wear; facilitate the maneuver, that is, the descent of a column of tubes inwards and their removal from the borehole; can withstand long periods of rotation with flow; and. sufficiently robust to prevent possible debris in the borehole.
    [0006] Centralizer suppliers also provide retaining collars to lock the centralizer in place. Most current products are attached to the tube column by a number of pins or screws, through the body of the retaining collar, biting the surface of the tube to lock the collars in place and prevent their movement.
    [0007] Recent tests have revealed that existing necklaces have weaknesses and can slide out of their borehole position below. This is particularly true when used when applying a liner or liner in drilling.
    [0008] A greater amount of rotation is experienced during drilling operations with a liner or liner. Current media are not designed with drilling in mind and there is a high risk that retaining collars may lose their grip on the liner and start to move. This causes the centralizers to change position which can break the structure of the tube column and also has the potential to damage the integrity of the tube column, for example, with respect to rupture and collapse, since the pins loosened on a retaining collar can scrape into the outer surface of the tube column at each rotation. There is a need for an improved design that can: hold the centralizer in place; reduce wear on the external portion of the centralizer; minimize the friction between the retaining collar and the centralizer; remove the risk of reducing the integrity of the coating due to protruding pins. DISCLOSURE OF THE INVENTION
    [0009] The above problems have been solved by the centralizer and the retaining collar according to the attached claims.
    [0010] An important objective of the present invention is to provide a centralizer created specifically for drilling operations with a coating or a liner. The invention can also be used to lower a coating or liner from the inside elongated borehole sections, where torque and drag become a problem.
    [0011] The objective can be achieved by means of a centralizer comprising a central body of centralizer to be located on the external surface of a column of tubes in the form of a liner or liner used during drilling; the centralizer body being formed with a plurality of external centralizer blades arranged helically, inclined, in the longitudinal axis of the centralizer body. The number and width of the blades can be modified, depending on the application of the centralizer; for example, the load to which the blades are expected to be subjected; the diameter of the centralizer; and the length of the blade and the angle of the blade in relation to the central axis of the centralizer. The centralizer body also comprises a separate inner tube section, attached to the outer surface of the tube column by means of a pressure fitting, and an inner surface consisting of a high friction surface, with the contact surfaces facing each other. another, between the centralizer body and its separate inner tube section, are made of a suitable material with low friction. This material forms a low friction bearing between the components. The separate inner tube section can be made of a tube section that is separated in its longitudinal direction, allowing it to be expanded and slid over the liner or liner that forms the tube column. In this context, the term “low friction materials” is used for materials that reduce the friction between the surfaces in contact in the centralizer assembly. The materials should preferably, but not necessarily, be able to be applied as a coating to a metal surface. Non-exclusive examples of suitable materials are low friction polymers, such as Teflon ©, polyethylene (PE), Medium Density Polyethylene (MDPE), Ultra High Molecular Weight Polyethylene (UHMWPE).
    [0012] To improve the fixation, the centralizer body is positioned on the column of tubes using a pair of retaining collars. The retaining collar is mounted non-rotatively around the liner or liner at each end of the centralizer body and allows the centralizer body to rotate in relation to the retaining collars, as well as in relation to the inner tube section, substantially without friction.
    [0013] To allow this substantially frictionless rotation, at least one facing face, or surface in contact with, the centralizer body is provided with a separate replaceable annular disk or coating comprising, or coated with, a suitable material with low friction . This material forms a low friction bearing between the components. The end of each retaining collar can be mounted in an end-to-end arrangement adjacent to a corresponding end of the centralizer body. Alternatively, the end of the retaining collar can be accommodated within a recess, conforming to the size of the retaining collar that is formed in the body of the centralizer, to protect the facing end or the surfaces in contact.
    [0014] To facilitate the sliding, both in and out of the borehole, the external blades of the centralizer are provided with a coating, or a protruding pad made of suitable low friction material. The projection pad is oval and formed and in order to conform to the outside diameter of the borehole. The shape and size of the pads depends on factors such as the diameter of the borehole, the diameter of the centralizer, the location of the pads within the radius of the centralizer body and the desired radial extent outside the blade.
    [0015] Alternatively, each external centralizer blade may comprise at least one external projected portion, extending over a predetermined distance radially outwardly from said centralizer blades. The predetermined distance at which the projection portions extend radially from the centralizer blades is selected to ensure that the projection portions prevent the centralizer blades from coming into contact with the borehole. This distance depends on the axis length and the angle of the centralizer blades, the outer diameter of the centralizer blades and the diameter of the borehole. Each projected portion can be in the form of a roller, such as, for example, a fail-safe oval-shaped roller, that is, having a basically oval shape, with an outer surface having a minimum diameter at each end and a maximum diameter in its middle section. The roller is mounted on bearings at each end and is arranged with its central axis at right angles to the central axis of the centralizer. The rollers are installed in recesses within the blades and extend radially outward through openings in the outer circumferential surface of the blades. The openings are smaller than the outside diameter of the roller at each point along its length. The shape of the openings is arranged to conform to the outer contour of the roller, extending over a predetermined radial distance out of the opening.
    [0016] The edges of an opening can be provided with an overlap, making the length of the opening shorter than the length of the roller, so that the aforementioned edges extend over the roller at their respective ends. Likewise, the width of the openings is less than the diameter of the roller at each point along its length, so that these side edges follow the oval shape of the roller along the length of the opening. Tolerances between the edges of the opening and the outer surface of the roller are selected to minimize the risk of material entering the recess. The relatively smaller opening prevents the rollers from falling into the borehole if the roller bearing shaft fails and thereby reduces the risk of debris entering the borehole that could obstruct the tube column during drilling or maneuvering. . The number of rollers can be varied depending on the axial length of the blade and / or the expected load on the centralizer. The shape and size of the rollers depends on factors such as the diameter of the borehole, the diameter of the centralizer, the location of the rollers on the radius of the centralizer body and the desired radial extent outside the borehole.
    [0017] In other words, during drilling, the present centralizer consists of a separate inner tube section that is placed over a section of the tube column at regular intervals. The inner diameter of the tube section is smaller in caliber than the outer diameter of the corresponding section of the tube column. As described above, the tube section is separated in its longitudinal direction, allowing it to be expanded and able to slide towards the lining or liner. The expanded tube section is slid towards the liner or liner from one end of it. When the tube section has been moved along the liner or liner to a desired position, the tube section is released and can contract on the liner or liner, where it is held in position to be snapped together. The separate tube section has a high friction inner surface and a low friction outer surface. The high friction inner surface is in direct contact with the liner or liner and helps to keep the tube section in position, allowing it to rotate together with the tube. The high friction surface may comprise an elongated coating of a suitable similar material. The low friction outer surface of the separate tube works as a bearing surface for the corresponding centralizer body which has a low friction inner surface.
    [0018] The internal low friction surface of the centralizer is achieved either with the use of a suitable low friction material on the inside of the centralizer body, or alternatively with the use of a suitable low friction material on the internal side. of the centralizer body, in combination with a central tube built into the centralizer body and made from a suitable low-friction material. The use of a low friction center tube will create an additional low friction bearing surface and thus create a low friction bearing between the centralizer body and the central tube and a second low friction bearing between the central tube and the separate tube mounted on the liner or liner.
    [0019] The use of the low friction surface between the separate tube and the centralizer body minimizes the resistance to rotation between these components. The creation of a low-friction rotating surface affixed and separated from the outer surface of the coating or lining, for cooperation with the centralizer body, also helps to prevent wear of this portion of the tube during longer rotation periods and radically increases the integrity against rupture or collapse.
    [0020] The centralizer body has a low friction inner surface to reduce rotational friction and is equipped with helically angled or curved blades on its outer surface to produce an improved circular coverage of the contact with the borehole. Oval-shaped rollers, or alternatively, low-friction, oval-shaped pads or liners are placed inside the blades to minimize slip resistance when the tube column is moved in or pulled out of a borehole. The oval configuration of the rollers or pads matches the outside diameter of the borehole bend and generates an even distribution of the load over the length of the rollers or pads in contact with the borehole. This arrangement avoids occasional loads on the rollers or pads and reduces the risk of uneven wear or failure.
    [0021] As described above, the external surfaces of a centralizer body that face the retaining collars can be provided with a low friction coating, or they can be equipped with an annular disc, either coated with, or comprising a material of low proper friction. The low friction external surfaces will also reduce the rotational resistance of the centralizer, especially when it is simultaneously rotated and moved in a radial direction of the borehole. The ends of the centralizer body may also have an annular recess, providing an overlap extending over a predetermined axial distance over the outer circumference of the retaining collars to reduce the amount of chips and particles entering the bearing surface. low friction, inside the centralizer body and on the external surfaces of said centralizer body. The recesses at the end of the centralizer body, which accommodate the retaining collars, and, if desired, the annular discs comprising, or coated with a suitable low-friction material, can be reached by allowing the centralizer body to extend axially , in addition to the outer ends of the inner low friction surface of said centralizer body, or matching each end of the centralizer body to form a recess.
    [0022] The outer ends of each retaining collar, whose outer surfaces face away from the centralizer body, form a transition between the liner or lining and the main retaining collar body. This first transition is chamfered, forming a truncated cone, to reduce the risk of entrapment in the sharp bores in the borehole and to act as a guide if steep changes in the borehole geometry are encountered. The outer ends of the centralizer body form a transition between the retaining collars and the outer diameter of the blades in the longitudinal direction of the centralizer body. This second transition is chamfered, forming a truncated cone, for the same reasons as the first transition described above.
    [0023] The purpose of the centralizer, according to the present invention, is to remove any wear from the tube column and the centralizer and at the same time minimize the rotational friction involved, when rotating the tube column. Since drilling operations with a liner or liner cause the pipe column to undergo long periods of rotation, the integrity of the pipe column becomes an issue. Current technology may have a potential wear problem, caused by friction between the inner surface of a moving centralizer and the outer side of the rotating tube column surface; it is a torque problem, caused by friction between the external surface of a fixed centralizer and the formation of the borehole.
    [0024] A retaining collar with a high friction inner surface is firmly attached to the tube by tightening a number of fixing screws, which causes the diameter of the retaining collar to be reduced. The clamping mechanism ensures that the equipment is kept in the desired position, without the risk of causing wear or damage to the tube body. The additional low-friction outer surface on the retaining collar, facing the direction of the centralizer body further reduces the restriction on centralizer rotation when the pipe column is displaced axially in the borehole.
    [0025] The present invention removes many of the boundaries of the difficulties of well construction and allows the construction and execution of extended deviated sections without overcoming the limitations created by the pipe column and surface equipment.
    [0026] In summary, the benefits achieved, when compared with existing technology, are as follows: • There is no wear on the outer surface of the coating - the existence of a section of pipe with an internal surface of high friction and an external surface of low friction attached to the tube column means that there is no rotational wear on the outside of the rotating tube column. • Low friction rotating surfaces - rotation occurs between the tube section attached to the liner, the low friction inner tube and the low friction inner surface of the centralizer body. Since these surfaces are made of a low-friction material, extremely low resistance to rotation is achieved. • Curved blades with rollers, low-friction linings or pads - the curved blades on the outer surface of the centralizer body create an improved coverage of the outside diameter in the borehole, reducing the risk of vibrations in the event of rotation on the outside of the body. centralizer and improve the stand-off retraction of the pipe column from the inside wall of the borehole. This arrangement combined with the low friction pads or rollers located in the axial direction of the centralizer to minimize friction against the outside coating or rock formation when descending the pipe column inside or outside the borehole. • Curved rollers or low friction pads on the blades - the rollers or pads are curved to match the inside / outside diameter of the well hole / front casing. The curvature of the rollers or pads leads to a balanced load on the surface of the roller or pad, thereby reducing point loads on the pad or roller and possible uneven wear or failure of the roller bearing. Low friction material between the retaining collar and the centralizer - external surfaces facing each other, one or both of which are provided with a low friction material, reducing the resistance to rotation to the surface between the fixed retaining collar and the rotary centralizer. Collar overlap / integration and retention - the retention collar fits within a recess that overlaps the outer surface of the centralizer body. This reduces the risk of sand / chip intrusion into the low-friction bearing surfaces between the retaining collar and the liner. • Fail-proof rollers - rollers installed in the fail-safe recess with an opening facing outwards radially, having a smaller size than the roller itself. This prevents the roller from falling out of the centralizer and possible obstructions against the bores in the bore hole. • Retaining collars, with high friction internal surfaces, fixed to the tube column by reducing the internal diameter of the retaining collar when the a fixing screws are tightened. The clamping mechanism reduces the risk of movement during tension and also has a distribution of forces against the internal tube column. This will ensure that there is no disruption in the integrity of the tube's resistance.
    [0027] In the description texts, both above and below, the examples can sometimes refer to "a coating". However, it should be understood that drilling operations using an arrangement according to the present invention can be carried out using a column of tubes in the form of a liner or liner. BRIEF DESCRIPTION OF THE DRAWINGS
    [0028] The invention will be described in detail, with reference to the attached figures. It should be understood that the drawings are intended only for the purpose of illustrating and are not intended to be a definition of the limits of the invention, to which we must refer to the attached claims. It should also be understood that the drawings are not necessarily drawn to scale and that, unless otherwise stated, they are simply intended to illustrate schematically the structures and procedures described here.
    [0029] Figures 1 to d show different lateral elevations of the centralizer, comprising a centralizer body provided with a central tube, a separate tube, external centralizer blades comprising rollers, and two detent collars in exploded perspective and sectional views, respectively.
    [0030] Figure 1e shows elevations of the end of a centralizer comprising a centralizer body with a separate divided inner tube, a central tube, external centralizer blades comprising rollers, and two detent collars in exploded perspective and sectioned views, respectively.
    [0031] Figure 1f shows a side elevation of an oval roller arrangement within a recess in the protruding centralizer blade.
    [0032] Figure 2 shows the same view as Figure 1b, in which the rollers have been replaced with a low-friction coating or pads. AND,
    [0033] Figure 3 shows a side elevation of the retaining collar in a perspective view. MODES FOR CARRYING OUT THE INVENTION
    [0034] As illustrated in Figs. 1a-1e, the present invention comprises four main components, that is, a centralizer body 2, a separate divided inner tube 8, a central tube 9 which can alternatively be an integrated part of the centralizer body 2 and a collar retainer 3. As shown in Figure 1a, identical retainer collars 3 are positioned at each end of the centralizer body 2.
    [0035] The centralizer body 2 is fixedly mounted around the casing 1 located in a borehole during a drilling operation. The centralizer body 2 comprises a separate divided inner tube 8 and is provided with a plurality of centralizer blades 4 arranged in an inclined, helical manner along the longitudinal axis thereof. In Fig. 1 and four centralizer blades 4 are shown, but this number can be modified according to the application of the centralizer. The separate split inner tube is attached to the liner by means of a pressure fitting. As already mentioned above, the inner surface of the centralizer body 2, the entire central tube 9 and the outer surface of the separate divided inner tube 8 facing each other are made of a suitable low-friction material, such as TeflonTM or nylon. . This arrangement allows the reduction of rotation friction between the centralizer body 2, the central tube 9 and the separate split inner tube 8 and ensures that no rotation occurs between the liner 1 and the separate split inner tube 8, thus preventing the wear of the outer diameter of the pipe column.
    [0036] The separate split inner tube 8 is provided with a longitudinal split 12 that allows it to be expanded and placed over the liner 1 into a selected position. The separate split inner tube 8 is made with a smaller caliber and clamps around the outer diameter of the liner by a force created by the resilient properties of the separate split inner tube 8, as the force expanding the split inner tube 8 is released. The grip of the split inner tube 8 is improved by an inner surface made of a high-friction material, such as brake liner materials or a soft metal (for example, aluminum). This low-friction tube is placed around the liner to function as a bearing surface, around which the centralizer body and the low-friction central tube 9 can be rotated. The intention is to protect against wear during rotation and to create a rotating surface outside the coating, with very low resistance to the revolution of the centralizer surface. After positioning the separate split inner tube 8 in the correct area, the centralizer body 2 and the central tube 9 are slid over the separate split inner tube 8 and secured in place by a retaining collar 3 on each side of the centralizer body 2 .
    [0037] Each end of the centralizer body 2 is equipped with a low annular friction ring 7 to reduce the rotational friction between the centralizer body 2 and the retaining collars 3. The central tube of low friction material 9 is formed by a cylindrical body placed between the separate tube 8 and the centralizer body 2. A retaining collar 6 is formed allowing each end of the centralizer body 2 to extend axially, in addition to the ends of the low friction cylindrical central tube 9. The ends of the low friction cylindrical central tube 9 form an annular retention, against which the respective annular low friction rings 7 and the retaining collars 3 are positioned. The superimposed retaining collar 6 reduces the amount of particles entering the bearing surfaces between the separate split inner tube 8, the center tube 9 and the centralizer body 2, and the retaining collars 3 and the low friction outer rings 7 , respectively.
    [0038] According to an additional example, the ends of the retaining collar 3 facing the body of the centralizer and can be provided with a low friction coating or be made from a suitable low friction material (not shown).
    [0039] The centralizer body is equipped with projection portions 5 formed on the helical blades of the centralizer 4. The curved blades produce a better circular coverage which makes the retraction less dependent on the position of the centralizer in the borehole. The projected portions reduce the slip resistance and each is made in the form of an oval-shaped roller 10 to prevent point loading at the roller edge in a curved borehole. The roller 10 is supported by means of an axis (see Figure 1f) mounted in a recess of the centralizer body 2 and extends along a predetermined radial distance outside the opening of the roller. The outer diameter of the roller 10 is greater than the width of the roller opening in the axial direction of the centralizer body. This arrangement removes the possibility of the rollers falling out of the centralizer body into the borehole and becoming an operational risk.
    [0040] A chamfer 11 at each end of the centralizer acts as a guide when cutting layers are found and reduces the risk of entrapment at the sharp edges of projections when descending or removing out of a borehole.
    [0041] As shown in Figure 1f, each projected portion can be in the form of a roller, such as the fail-safe oval roller, with an outer surface that has a minimum diameter at each end and a maximum diameter at the section average. The roller is supported on bearings at each end and is arranged with its central axis at right angles to the central axis of the centralizer. The rollers are installed in recesses within the blades and extend radially outward through the openings in the outer circumferential surface of the blades. These openings are smaller than the outer diameter of the roller at each point along its length. The roller can be located in a machined recess within the inner surface of the centralizer body, which recesses through the outer surface of the centralizer blade. The shape of the aperture is arranged to conform to the outer contour of the roller extending over a predetermined radial distance outside the aperture.
    [0042] Figure 2 shows an alternative embodiment of the invention shown in Figure 1b. In Figure 2, each of the projected portions indicated by reference number 5 in Figure 1b are replaced by a pad 25 made from a suitable low-friction material dipped inside the outer surface of the blade 24 or a suspended surface provided with a coating made of a low friction material. The remaining numbers are identical to those used in Figure 1b. The pad 25 or the suspended, coated surface projects over a predetermined radial distance from the outer surface of the blade 24. The low-friction or coated pad reduces the slip resistance between the centralizer and the borehole. The pad or liner is given an oval shape that conforms to the diameter of the borehole to prevent a point load from being applied to the pad or liner by the borehole wall.
    [0043] The external diameter and internal diameters of the centralizer, in the above embodiment, are matched to the size of the coating. The internal diameter of the centralizer normally ranges from approximately 4 ”(10.16 cm) to 20” (50.80 cm) and the external diameter in the centralizer ranges from 6 ”(15.24 cm) to 24” ( 60.96 cm). The length of the centralizer may vary slightly with its internal diameter; but, it typically ranges from 15 ”(38.10 cm) to 30” (76.20 cm).
    [0044] As shown in Fig. 3, the retaining collar comprises a divided main body 31 that must be slid over the liner, and a number of fixing screws 34 arranged in a tangent direction, at right angles to the central axis of the main body 31. The fixing screws 34 extend through a gap 33 formed by the divided portion of said main body 31, but do not protrude outside the outside diameter thereof. A retaining collar is slid towards the coating at the end of a coating section to a selected position. When the fixing screws 34 are tightened, the internal diameter of the retaining collar 3 is reduced and the retaining collar is fastened around the liner to ensure that the contact between the pipe column liner and the retaining collar is as tight as possible. possible. A high friction outer surface 32 on the retaining collar is provided to increase the resistance to movement between the retaining collar and the liner after the retaining collar has been firmly fixed in place. The retaining collar 3 is also formed with a chamfer configuration 36 at the remote end from the centralizer body and has a low friction ring 35 on an external surface facing the centralizer body. The low friction ring 35 can be used in place of, or as a supplement to, the low friction ring 7, mentioned in connection with the Figures above 1a to 1e. The low friction ring 35 is installed against the centralizer and ensures that the friction between the retaining collars and the centralizer assembly is kept as low as possible when the pipe column lining is rotated. The chamfer 26 in the retaining collar is arranged to guide the column of tubes, if bumps are found in the borehole, and reduces the risk of sticking during operations.
    [0045] The outside diameter and internal diameters of the retaining collar in the above embodiments are matched to the size of the coating. The internal diameter of the retaining collar typically ranges from 4 ”(10.16 cm) to 20” (50.80 cm). The length of the retaining collar may vary slightly according to its internal diameter, but it typically ranges from 2 ”(5.08 cm) to 6” (15.24 cm).
    权利要求:
    Claims (15)
    [0001]
    1. Centralizer comprising a centralizer body (2) to be located on the outer surface of a column of tubes (1) in the form of a liner or liner used during drilling, the centralizer body being formed with a plurality of external centralizer blades (4) arranged in an inclined way on a longitudinal axis of the centralizer, characterized by the fact that the centralizer also comprises a divided inner tube (8) attached to the tube column (1) and a central tube, in which the centralizer body ( 2) is arranged to be rotatable around the divided inner tube (8) and around the central tube (9), and where an inner surface of the central tube facing an outer surface of the divided inner tube and an outer surface of the central tube facing an internal surface of the centralizing body comprises a material of low friction, wherein the internal surface of the divided inner tube comprises a second material different from the material of low until rite, the second material having a higher coefficient of friction than the low friction material.
    [0002]
    2. Centralizer according to claim 1, characterized in that a retaining collar (3) is arranged at both ends of said centralizer body (2), and that said centralizer body (2) is arranged to stay in rotation with respect to the mentioned retaining collar (3), at least one external surface on the centralizer body (2) and / or on the retaining collar (3) comprises a low friction material.
    [0003]
    3. Centering device according to claim 2, characterized by the fact that an annular ring (7, 35) coated with, or made of a low friction material comprises being located between the centralizing body (2) and at least one collar of retention (3).
    [0004]
    4. Centralizer according to claim 2 or 3, characterized in that the retaining collar (3) is provided with a chamfer (36) at the remote end of the centralizer body (2).
    [0005]
    5. Centralizer according to claims 2 to 4, characterized by the fact that the ends of the retaining collar (3) facing the centralizer body (2) are each accommodated within a recess (6) formed in each end of the centralizer body (2).
    [0006]
    6. Centering unit according to claims 2 to 5, characterized in that the retaining collar comprises a main body divided 31 with a longitudinal span (33) provided with a fixing means (34), for fixing the retaining collar. retention (3) in the tube column (1), and an internal surface (32) made of a high friction material.
    [0007]
    7. Centralizer according to any of claims 1 to 6, characterized by the fact that the external blades of the centralizer (4) are provided with at least one external projected portion (5).
    [0008]
    8. Centralizer according to claim 7, characterized by the fact that each projected portion (5) is provided with a coating made of a low friction material.
    [0009]
    9. Centralizer according to claim 7, characterized by the fact that each projected portion (5) is in the form of a cushion (5) made of a low friction material.
    [0010]
    10. Centralizer according to claim 7, characterized by the fact that each projected portion (5) is in the form of a roller (10).
    [0011]
    11. Centralizer according to claim 10, characterized by the fact that each projected portion (5) is in the form of a roller having a basic oval shape.
    [0012]
    12. Centerer according to claim 10 or 11, characterized by the fact that each roller (10) is located in a recess in the centerer body (2) and extends over a predetermined distance radially outward from the blades of the centralizer (4) mentioned.
    [0013]
    13. Centerer according to claim 10, 11 or 12, characterized in that each roller (10) extends radially outwards through an opening in the outer circumferential surface of the centralizer blades (4), and that the opening is less than the outer diameter of the roller at each point along its length.
    [0014]
    14. Centralizer according to any of claims 1 to 13, characterized in that the outer blades of the centralizer (4) are formed in a curved or helical configuration.
    [0015]
    15. Centralizer according to any of claims 1 to 14, characterized by the fact that the separate divided inner tube (8) comprises a longitudinal division (12) and an inner surface made of a high friction material allowing a fit by pressure against the pipe column (1).
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    同族专利:
    公开号 | 公开日
    GB2503124B|2018-08-29|
    CA2823997A1|2012-07-12|
    US20170074055A1|2017-03-16|
    GB2503124A|2013-12-18|
    NO20131077A1|2013-08-07|
    US9534456B2|2017-01-03|
    WO2012092985A1|2012-07-12|
    BR112013016844A2|2016-09-27|
    GB201313169D0|2013-09-04|
    CA2823997C|2017-11-21|
    US9963942B2|2018-05-08|
    US20130292183A1|2013-11-07|
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    AU2010319948B2|2009-11-13|2013-04-04|Wwt North America Holdings, Inc.|Open hole non-rotating sleeve and assembly|
    BR112013016844B1|2011-01-07|2021-01-05|Statoil Petroleum As|centralizer|BR112013016844B1|2011-01-07|2021-01-05|Statoil Petroleum As|centralizer|
    CA2784269A1|2012-07-27|2014-01-27|Gerald L. Binetruy|Continuous rod centralizer|
    WO2014142784A1|2013-03-11|2014-09-18|Bp Corporation North America Inc.|Rotating drilling stabilizer|
    US9534475B2|2013-05-27|2017-01-03|Landmark Graphics Corporation|GUI-facilitated centralizing methods and systems|
    AU2013393872B2|2013-07-09|2016-08-11|Halliburton Energy Services, Inc.|Methods and apparatus for mitigating downhole torsional vibration|
    US20160060973A1|2014-08-29|2016-03-03|Chimerebere O. Nkwocha|Centralizer|
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    CN107842321B|2017-10-07|2019-08-20|西南石油大学|One kind being used for the righting of Deep Water Drilling Riser section drilling rod and shoe|
    US10920503B2|2018-04-03|2021-02-16|Unique Machine, Llc|Oil well casing centralizing standoff connector and adaptor|
    GB201806175D0|2018-04-16|2018-05-30|Maxwell Oil Tools Ltd|Modified tubular|
    EP3844366A1|2018-08-29|2021-07-07|Impact Selector International, Llc|Apparatus and method for running casing into a wellbore|
    AU2019213357A1|2018-10-05|2020-04-23|Downhole Products Limited|Slimline Stop Collar|
    US20210285292A1|2020-03-11|2021-09-16|Downhole Products Limited|Slimline stop collar with solid cam ring|
    GB2595333A|2021-02-24|2021-11-24|Nxg Tech Limited|Torque reduction assembly|
    法律状态:
    2019-01-08| B06F| Objections, documents and/or translations needed after an examination request according art. 34 industrial property law|
    2019-08-20| B06U| Preliminary requirement: requests with searches performed by other patent offices: suspension of the patent application procedure|
    2020-04-28| B07A| Technical examination (opinion): publication of technical examination (opinion)|
    2020-09-29| B09A| Decision: intention to grant|
    2021-01-05| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 07/01/2011, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    PCT/EP2011/050180|WO2012092985A1|2011-01-07|2011-01-07|Centralizer|
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