CN216811603U - Roller centralizer - Google Patents
Roller centralizer Download PDFInfo
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- CN216811603U CN216811603U CN202122480655.1U CN202122480655U CN216811603U CN 216811603 U CN216811603 U CN 216811603U CN 202122480655 U CN202122480655 U CN 202122480655U CN 216811603 U CN216811603 U CN 216811603U
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Abstract
The utility model discloses a roller centralizer, which comprises a central pipe and a centralizing assembly assembled outside the central pipe, wherein the centralizing assembly comprises a first roller and a second roller; the centralizing assembly comprises a support sleeve and a radial telescopic belt roller mechanism, and the support sleeve is sleeved outside the central pipe; the radial telescopic belt roller mechanism is provided with a radial elastic contraction mechanism on the radial inner side of the radial telescopic belt roller mechanism; the radial telescopic type belt roller mechanism is provided with an axial roller rolling mechanism on the outer wall of the radial telescopic type belt roller mechanism. The utility model can reduce the friction between the casing and the well wall; and this centralizer periphery has the spring, and the reducing scope is big, and the centralizer can stretch out and retract, has solved the unable flexible of current centralizer body external diameter, appears the problem that the card hinders when the instrument in the pit plays easily.
Description
Technical Field
The utility model relates to the technical field of oilfield development, in particular to a roller centralizer.
Background
At present, oil-gas wells generally have oblique angles, particularly inclined wells and horizontal wells. Even a vertical well has a certain inclination due to deformation of the earth's crust and limitations of well trajectory control techniques during drilling. When the inclined wells are operated, a centralizer needs to be additionally connected to an operation tool so as to prevent the tool from directly rubbing against the inner wall of a well bore and damaging the tool. In the prior centralizer, a sliding block is arranged on a centralizer main body, and the aim of centralization is achieved by means of sliding friction generated between the sliding block and the inner wall of an oil well. The centralizer has the defects of large friction coefficient, quick abrasion, and need of timely replacing the seriously abraded centralizing wheel to avoid eccentric abrasion, thereby shortening the operation period, ensuring frequent maintenance and influencing the improvement of the production efficiency.
Publication (bulletin) No.: CN102140895A, publication (public notice) day: 2011-08-03 provides a roller type centralizer, which belongs to a device for oil field production and comprises a centralizer main body, wherein a plurality of pairs of roller supports are fixed on the outer side of the centralizer main body, rollers are arranged between the pairs of roller supports through shafts, the inner sides of the rollers protrude out of the inner wall of the centralizer main body through holes in the centralizer main body, the outer sides of the rollers protrude out of the outer end faces of the roller supports, and a bearing pressing cap and another bearing pressing cap are respectively arranged at two ends of the centralizer main body. The roller type centralizer can be sleeved on a workover string during use, and during workover operation, the rollers are in contact with the inner wall of an oil layer casing pipe to form fulcrums, so that the workover string is not in contact with the oil layer casing pipe, and the sliding friction between the workover string and the oil layer casing pipe is changed into rolling friction between the oil layer casing pipe and the rollers, thereby reducing the wear resistance loss, improving the rotating torque transmission effect of the workover string, and protecting the oil layer casing pipe. The centralizer has particularly obvious effect in the construction operation of movable unfreezing and well repairing.
Publication (bulletin) No.: CN106907116B, publication (public notice) day: 2018-08-24 relates to a universal roller type reducing centralizer, which comprises a body, an upper joint, a reducing mechanism and a universal roller mechanism. The diameter-changing mechanism is positioned inside the body and the upper joint, a piston and a piston rod of the diameter-changing mechanism are positioned inside the upper joint, the piston pushes the guide block under the action of a reset spring and drilling fluid, the universal roller mechanism is arranged in grooves uniformly distributed in the circumferential direction outside the body, the core rod can move back and forth under the action of hydraulic pressure and spring force, the universal roller is arranged on the plunger through a wheel shaft, and the plunger can be pushed to move outwards due to the conical step on the outer surface of the core rod, so that the working outer diameter of the centralizer is changed, the outer diameter of the centralizer is the minimum when the hydraulic pressure is reduced to the minimum, and the drill string can be conveniently put in and taken out. The centralizer can realize that the outer diameter is tightly attached to the well wall in real time, has the function of reducing friction, and improves the centering degree of a drill column, the quality of the well wall and the drilling efficiency.
Publication (bulletin) No.: CN201344110Y, publication (public notice) day: 2009-11-11 discloses an electric submersible pump roller centralizer, by the main part, go up and press the cover, the clutch blocks, a spring, the stopper, the ball, the cover is constituteed down, process several vertical grooves in the main part, install a clutch blocks in every vertical groove, the clutch blocks is by last pressure cover, press the cover hoop on the main part down, make the clutch blocks can not drop, install the spring between vertical tank bottom and the clutch blocks in the main part, from the inboard installation ball of clutch blocks, a part of ball exposes the clutch blocks, the stopper is installed on the clutch blocks, make the ball can not drop, guarantee that the ball can roll. During free state, the circumference diameter that each ball formed is greater than the sleeve pipe internal diameter, and under the spring action, the circumference diameter that each ball formed can reduce, can go into the well, goes into the well back, and ball and sleeve pipe contact, when playing down in the well, be rolling friction between ball and the sleeve pipe, frictional force is little, can not wear and tear sleeve pipe, protective case.
In summary, the technical solutions of the above-disclosed technologies, the technical problems to be solved, and the advantageous effects thereof are all different from the present invention, and no technical inspiration exists in the above-disclosed technical documents for further technical features, technical problems to be solved, and advantageous effects thereof.
SUMMERY OF THE UTILITY MODEL
In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to provide a roller centralizer that is more reliable and ensures that a running tool is positioned in the middle of a wellbore. The friction between the casing and the well wall can be reduced; and this centralizer periphery has the spring, and the reducing scope is big, and the centralizer can stretch out and retract, has solved the unable flexible of current centralizer body external diameter, appears the problem of jam when the instrument in the pit plays.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a roller centralizer comprises a central pipe and a centralizing assembly assembled outside the central pipe;
the centralizing assembly comprises a support sleeve and a radial telescopic belt roller mechanism, and the support sleeve is sleeved outside the central pipe;
the radial telescopic belt roller mechanism is provided with a radial elastic contraction mechanism on the radial inner side of the radial telescopic belt roller mechanism;
the radial telescopic belt roller mechanism is provided with an axial roller rolling mechanism on the outer wall of the radial telescopic belt roller mechanism.
Further, the radial telescopic belt roller mechanism comprises a support body, a radial elastic contraction mechanism and an axial roller rolling mechanism;
the support body is positioned outside the support sleeve;
the radial inner side surface of the support body is provided with an inner mounting groove for connecting and mounting a radial elastic contraction mechanism;
and the outer wall of the support body is provided with an outer mounting groove for mounting the axial roller rolling mechanism.
Furthermore, the number of the radial telescopic belt roller mechanisms is 6, and the radial telescopic belt roller mechanisms surround the outside of the support sleeve in an annular matrix.
Furthermore, the radial elastic contraction mechanism comprises a supporting spring, the outer end of the supporting spring is connected with the inner mounting groove, and the inner end of the supporting spring is connected with the outer wall of the supporting sleeve.
Further, each radial elastic contraction mechanism is provided with 3 supporting springs.
Further, the axial roller rolling mechanism comprises a roller, and the roller is installed in the outer installation groove.
Further, each axial roller rolling mechanism is provided with 4 rollers.
Furthermore, the upper end of the central tube is connected with the upper joint, and the lower end of the central tube is connected with the lower joint.
Furthermore, an upper pressing cap is arranged on the upper joint and can limit the upper end of the support body in the axial direction and the radial direction; the lower joint is provided with a pressing cap which can axially limit and radially limit the lower end of the support body.
Compared with the prior art, the utility model has the following beneficial effects:
the device is provided with the movable roller, so that the friction between the device and a casing or a well wall can be reduced in the process of descending into the well; meanwhile, the centralizer is provided with a spring on the periphery, has a large diameter-changing range, can adapt to the size change of a sleeve or a well wall within a certain range, and solves the problem that the underground tool is easy to block when being lifted and lowered; the movable roller and the spring of the device can protect the centralizer, and can be replaced after being damaged, so that the operation cost can be effectively reduced.
The utility model is mainly applied to the occasions of operation tools such as a straight inclined well and a horizontal well when the operation tools are put into a shaft, the upper end of the operation tools can be connected with an oil pipe, the lower end of the operation tools can be connected with a filling tool and the like, the arrangement of the putting tools in the middle of the shaft is ensured, the inclination of the putting tools is prevented, the service life of the tools is prolonged, and the construction success rate is improved.
Drawings
FIG. 1 is a schematic structural view of a roller centralizer according to the present invention;
fig. 2 is a cross-sectional view of fig. 1.
In the figure: 1-upper joint; 2, pressing a cap; 3-a support; 4, rolling wheels; 5, a bearing; 6-supporting the spring; 7-supporting sleeve; 8-a central tube; 9-pressing the cap; 10-a helical pin; 11-lower joint.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
referring to fig. 1 to 2, the present invention provides a technical solution:
a roller centralizer comprises a central pipe 8 and a centralizing assembly assembled outside the central pipe;
the centralizing assembly comprises a support sleeve 7 and a radial telescopic belt roller mechanism, and the support sleeve is sleeved outside the central pipe;
the radial telescopic belt roller mechanism is provided with a radial elastic contraction mechanism on the radial inner side of the radial telescopic belt roller mechanism;
the radial telescopic belt roller mechanism is provided with an axial roller rolling mechanism on the outer wall of the radial telescopic belt roller mechanism.
Further, the radial telescopic belt roller mechanism comprises a support body 3, a radial elastic contraction mechanism and an axial roller rolling mechanism;
the support body is positioned outside the support sleeve;
the radial inner side surface of the support body is provided with an inner mounting groove for connecting and mounting a radial elastic contraction mechanism;
and the outer wall of the support body is provided with an outer mounting groove for mounting the axial roller rolling mechanism.
Furthermore, the number of the radial telescopic belt roller mechanisms is 6, and the radial telescopic belt roller mechanisms surround the outside of the support sleeve in an annular matrix.
Further, the radial elastic contraction mechanism comprises a supporting spring 6, the outer end of the supporting spring is connected with the inner mounting groove, and the inner end of the supporting spring is connected with the outer wall of the supporting sleeve.
Further, each radial elastic contraction mechanism is provided with 3 supporting springs.
Further, the axial roller rolling mechanism comprises a roller 4, and the roller is installed in the outer installation groove.
Further, each axial roller rolling mechanism is provided with 4 rollers.
Furthermore, the upper end of the central pipe is connected with the upper joint 1, and the lower end of the central pipe is connected with the lower joint 11.
Furthermore, the upper joint is provided with an upper pressing cap 2 which can axially limit and radially limit the upper end of the support body; the lower joint is provided with a lower pressing cap 9 which can axially limit and radially limit the lower end of the support body.
The upper pressing cap is connected with the upper joint through a spiral pin to prevent rotation looseness; the lower pressing cap and the lower connector are the same.
The upper end and the lower end of the central pipe 8 are provided with an upper joint 1 and a lower joint 11 which can be respectively connected with operation tools such as an oil pipe, a filling tool and the like. Six groups of upper and lower rollers 4 and three groups of support springs 6 are uniformly arranged on the support body 3 along the circumferential direction, the centralizer rollers 4 protrude out of the support body 3, the roller bearings 5 are perpendicular to the axis of the centralizer, the roller shafts are arranged on the support body, the support body is positioned outside the support sleeve, pressure caps 2 and 9 are arranged above and below the support body, and the pressure caps are sleeved on the centralizer support body; six groups of supporting springs are embedded into the inner supporting body 7 in the upper, middle and lower directions in the circumferential direction, so that the size is reduced before entering a casing or a well wall, the size is increased after entering a shaft well through the narrowest part of the well mouth smoothly, and the supporting device is supported on the inner wall to solve the problem that the centralizer cannot be directly supported on the inner wall of the shaft well. The utility model adopts a roller form, the embedded ball and the sleeve are in rolling friction, and compared with the sliding friction between the centralizer and the sleeve, the friction force between the centralizer and the inner wall of the sleeve is reduced, and the service life of the centralizer is prolonged; the supporting spring on the outer circumference enhances the centering function of the centering device, and the outer diameter of the centering device can be adjusted at the same time.
The centralizer is provided with movable rollers, so that friction between the centralizer and a casing or a well wall can be reduced; and this centralizer periphery has the spring, and the reducing scope is big, and the centralizer can stretch out and retract, has solved the unable flexible of current centralizer body external diameter, appears the problem that the card hinders when the instrument in the pit plays easily.
Example 2:
referring to fig. 1 to 2, the present invention provides a technical solution:
a roller centralizer comprises a central pipe 8 and a centralizing assembly assembled outside the central pipe;
the centralizing assembly comprises a support sleeve 7 and a radial telescopic belt roller mechanism, and the support sleeve is sleeved outside the central pipe;
the radial telescopic belt roller mechanism is provided with a radial elastic contraction mechanism on the radial inner side of the radial telescopic belt roller mechanism;
the radial telescopic belt roller mechanism is provided with an axial roller rolling mechanism on the outer wall of the radial telescopic belt roller mechanism.
Further, the radial telescopic belt roller mechanism comprises a support body 3, a radial elastic contraction mechanism and an axial roller rolling mechanism;
the support body is positioned outside the support sleeve;
the radial inner side surface of the support body is provided with an inner mounting groove for connecting and mounting a radial elastic contraction mechanism;
and the outer wall of the support body is provided with an outer mounting groove for mounting the axial roller rolling mechanism.
Example 3:
referring to fig. 1 to 2, the present invention provides a technical solution:
a roller centralizer comprises a central pipe 8 and a centralizing assembly assembled outside the central pipe;
the centralizing assembly comprises a support sleeve 7 and a radial telescopic belt roller mechanism, and the support sleeve is sleeved outside the central pipe;
the radial telescopic belt roller mechanism is provided with a radial elastic contraction mechanism on the radial inner side of the radial telescopic belt roller mechanism;
the radial telescopic belt roller mechanism is provided with an axial roller rolling mechanism on the outer wall of the radial telescopic belt roller mechanism.
Although fig. 1 to 2 are used in all the above embodiments, it is apparent to those skilled in the art that separate drawings are not provided for illustration as long as parts or structural features missing from the embodiments are removed from the drawings. As will be clear to the skilled person. Of course, the embodiment with more components is only the best embodiment, and the embodiment with less components is the basic embodiment, but the basic object of the utility model can also be achieved, so all the modified embodiments are within the protection scope of the utility model.
All parts which are not discussed in the present application and the connection mode of the parts in the present application belong to the known technologies in the field, and are not described again. Such as welding, threaded connections, etc.
In the present invention, the term "plurality" means two or more unless explicitly defined otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "front", "rear", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or unit must have a specific direction, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A roller centralizer comprises a central pipe and a centralizing assembly assembled outside the central pipe;
the centering device is characterized in that the centering assembly comprises a support sleeve and a radial telescopic belt roller mechanism, wherein the support sleeve is sleeved outside the central pipe;
the radial telescopic belt roller mechanism is provided with a radial elastic contraction mechanism on the radial inner side of the radial telescopic belt roller mechanism;
the radial telescopic belt roller mechanism is provided with an axial roller rolling mechanism on the outer wall of the radial telescopic belt roller mechanism.
2. The roller centralizer of claim 1, wherein the radially retractable belt roller mechanism comprises a support body, a radially elastic contraction mechanism, an axial roller rolling mechanism;
the support body is positioned outside the support sleeve;
the radial inner side surface of the support body is provided with an inner mounting groove for connecting and mounting a radial elastic contraction mechanism;
and the outer wall of the support body is provided with an outer mounting groove for mounting the axial roller rolling mechanism.
3. A roller centralizer according to claim 2 wherein the radially telescopic belt roller mechanism is provided in 6, annular matrix around the outside of the support sleeve.
4. The roller centralizer of claim 3, wherein the radially resilient contractive mechanism includes a support spring, an outer end of the support spring is connected to the inner mounting groove, and an inner end of the support spring is connected to the outer wall of the support sleeve.
5. A roller centraliser according to claim 4, wherein 3 support springs are provided for each radially resilient contraction means.
6. A roller centraliser according to claim 4 or 5, wherein the axial roller rolling mechanism comprises a roller mounted in an outer mounting groove.
7. A roller centraliser according to claim 6, wherein 4 rollers are provided per axial roller rolling mechanism.
8. A roller centraliser according to claim 4 or 5, wherein the upper end of the centre tube is connected to the upper sub and the lower end of the centre tube is connected to the lower sub.
9. The roller centralizer of claim 8, wherein the upper joint is provided with an upper pressing cap which can axially limit and radially limit the upper end of the support body; the lower joint is provided with a pressing cap which can axially limit and radially limit the lower end of the support body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122480655.1U CN216811603U (en) | 2021-10-14 | 2021-10-14 | Roller centralizer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122480655.1U CN216811603U (en) | 2021-10-14 | 2021-10-14 | Roller centralizer |
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| CN216811603U true CN216811603U (en) | 2022-06-24 |
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| CN202122480655.1U Active CN216811603U (en) | 2021-10-14 | 2021-10-14 | Roller centralizer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115929223A (en) * | 2023-02-24 | 2023-04-07 | 中煤科工西安研究院(集团)有限公司 | Underground drilling centralizing mechanism |
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2021
- 2021-10-14 CN CN202122480655.1U patent/CN216811603U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115929223A (en) * | 2023-02-24 | 2023-04-07 | 中煤科工西安研究院(集团)有限公司 | Underground drilling centralizing mechanism |
| CN115929223B (en) * | 2023-02-24 | 2023-05-16 | 中煤科工西安研究院(集团)有限公司 | Underground drilling centralizing mechanism |
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