High angle well horizontal well coring tool centralizer

Abstract

The present application relates to the technical field of a core tool centralizer, and discloses a large-inclination well horizontal well core tool centralizer, which comprises an upper joint, a lower joint and a support, the lower end of the upper joint is located at the inner side of the upper part of the lower joint, the lower part of the upper joint is provided with an annular groove, the outer side of the lower part of the upper joint is uniformly provided with at least three supports along the circumference, the upper part of the support is hinged to the upper joint, the lower joint is provided with a mounting groove corresponding to the position of each support, the support is located in the mounting groove, the upper joint is in sliding connection with the lower joint, the support can be opened when the lower joint moves upward relative to the upper joint, and the support is provided with a contraction member which can make the support contract inwardly. The present application has reasonable and compact structure and is convenient to use, the support can be opened when the lower joint moves upward after the drill bit touches the bottom, the outer cylinder can be supported, the core tool can be kept in the center during drilling, the core can be smoothly put into the cylinder and protected during core taking in the large-inclination well horizontal well, and the core taking yield is effectively improved.

Description

Technical Field

[0001] This invention relates to the technical field of coring tool centering devices, specifically a centering tool centering device for horizontal wells with high deviation. Background Technology

[0002] When coring in highly deviated horizontal wells, the long horizontal section and numerous strata traversed result in poor wellbore stability due to various factors during trajectory control. Careful design is crucial before coring to ensure wellbore stability and prevent wellbore collapse and irregularities. The long horizontal section of a horizontal well leads to significant frictional resistance during coring. Furthermore, the relatively low drilling pressure and limited power provided to the drill bit for rock breaking during directional drilling can increase drilling difficulty and result in wellbore irregularities. The application of long horizontal well technology involves numerous pieces of equipment, large drilling volumes, and a correspondingly large contact area with the wellbore. Under gravity, the frictional force with the wellbore is high, leading to the following problems during coring in highly deviated horizontal wells. Current coring tools for highly deviated horizontal wells have the following shortcomings: firstly, the pressure at the bottom of the well results in high frictional resistance during coring; secondly, the coring tool is often not centered during drilling. Summary of the Invention

[0003] This invention provides a centering device for coring tools in horizontal wells with high deviation, which overcomes the shortcomings of the prior art and can effectively solve the problem of high frictional resistance and non-centering during drilling of existing centering devices for horizontal wells with high deviation, thus affecting the coring recovery rate.

[0004] The technical solution of the present invention is achieved through the following measures: a centering device for a horizontal well coring tool with a large deviated angle, comprising an upper connector, a lower connector, and supports. The lower end of the upper connector is located inside the upper part of the lower connector. The lower part of the upper connector is provided with an annular groove. At least three supports are evenly distributed along the circumference on the outer side of the lower part of the upper connector. The upper part of the supports is hinged to the upper connector. The lower connector corresponding to each support position is provided with an installation groove. The supports are all located in the installation groove. The upper connector and the lower connector are slidably connected. When the lower connector slides upward relative to the upper connector, it can open the support. A retractable member that can retract inward is installed on the support. The lower connector is provided with an inner annular platform. A return spring is provided between the upper side of the inner annular platform and the lower end of the upper connector.

[0005] The following are further optimizations and / or improvements to the above-mentioned technical solution: Preferably, it also includes a locking block, wherein a limiting groove is provided on the outer side of the upper connector between each two adjacent supports, and a locking groove is provided on the outer side of the upper part of the lower connector corresponding to each limiting groove position. The lower part of the locking block is located in the locking groove, and the upper part of the locking block is located in the limiting groove. The locking block is fixedly installed together with the lower connector by screws.

[0006] Preferably, the retraction component is a circular spring, and each support has a placement groove on its upper outer side, in which the circular spring is installed.

[0007] Preferably, it also includes a locking pin, and the lower part of the upper connector and the upper part of the lower connector are fixed together by the locking pin.

[0008] Preferably, the bottom of the mounting groove has an inclined guide surface.

[0009] This invention has a reasonable and compact structure and is easy to use. By setting up a support, the lower joint can be moved up and spread open after the drill bit touches the bottom, so as to straighten the outer cylinder and keep the coring tool in the center during drilling. This achieves the purpose of smooth core entry into the cylinder and protection of the core when coring in high-angle wells and horizontal wells, and effectively improves the core recovery rate. Attached Figure Description

[0010] Appendix Figure 1 This is a schematic diagram of the main structure of an embodiment of the present invention.

[0011] Appendix Figure 2 For the appendix Figure 1 A cross-sectional structural diagram.

[0012] Appendix Figure 3 A schematic diagram of the main view structure supporting the opening.

[0013] Appendix Figure 4 For the appendix Figure 3 A cross-sectional structural diagram.

[0014] Appendix Figure 5 This is a three-dimensional structural diagram of the upper connector.

[0015] Appendix Figure 6 This is a three-dimensional structural diagram of the lower connector.

[0016] Appendix Figure 7 A schematic diagram of the main structure of the connecting pipe string of the present invention.

[0017] The codes in the attached diagram are as follows: 1 is the upper connector, 2 is the lower connector, 3 is the support, 4 is the locking block, 5 is the circular spring, 6 is the screw, 7 is the reset spring, 8 is the guide surface, 9 is the limiting groove, 10 is the mounting groove, 11 is the inner ring platform, 12 is the locking groove, 13 is the placement groove, and 14 is the locking pin. Detailed Implementation

[0018] The present invention is not limited to the following embodiments, and the specific implementation can be determined according to the technical solution of the present invention and the actual situation.

[0019] In this invention, for ease of description, the description of the relative positions of the components is based on the appendix to the specification. Figure 1The layout is described using a diagrammatic method, such as front, back, top, bottom, left, right, etc. The positional relationships are determined based on the layout direction of the attached diagram in the instruction manual.

[0020] The present invention will be further described below with reference to embodiments and accompanying drawings: Example 1: As shown in the attached document Figure 1-7 As shown, the centering device for a high-angle horizontal well includes an upper connector 1, a lower connector 2, and supports 3. The lower end of the upper connector 1 is located on the inner side of the upper part of the lower connector 2. The lower part of the upper connector 1 is provided with an annular groove. At least three supports 3 are evenly distributed along the circumference on the outer side of the lower part of the upper connector 1. The upper part of the supports 3 is hinged to the upper connector 1. The lower connector 2 corresponding to each support 3 position is provided with an installation groove 10. The supports 3 are all located in the installation groove 10. The upper connector 1 and the lower connector 2 are slidably connected. When the lower connector 2 slides upward relative to the upper connector 1, it can open the supports 3. A retractable part that can retract inward is installed on the supports 3. The lower connector 2 is provided with an inner annular platform 11. A return spring 7 is provided between the upper side of the inner annular platform 11 and the lower end of the upper connector 1.

[0021] In use, this invention is installed on a conventional coring tool. Multiple units can be installed as needed. The lower end of the invention, located at the bottom, is connected to the drill bit and rotates with it. When the drill bit reaches the bottom, the lower connector 2 moves upward relative to the upper connector 1, compressing the return spring 7. The support 3 is then opened by the lower connector 2 and contacts the well wall, thus straightening the outer cylinder and ensuring smooth core entry. Simultaneously, during drilling, the support 3 opens and rotates with the drill bit, smoothing irregular wellbore surfaces and reducing frictional resistance during coring. Once the desired coring length is reached, the return spring 7 extends during the entire lifting process of the coring tool, pushing the lower connector 2 back to its original position. Under the action of the retraction mechanism, the support 3 retracts into the mounting groove 10, allowing for successful core cutting and coring. The straightening function of this invention is self-contained, requiring no additional power, and is fast, convenient, and efficient. As needed, eight supports 3 are evenly distributed along the circumference of the lower outer side of the upper connector 1. The number of supports 3 can be set according to the required support force.

[0022] The centering device for coring tools in highly deviated horizontal wells can be further optimized and / or improved according to actual needs: Example 2: As shown in the attached document Figure 1-6 As shown, it also includes a locking block 4. A limiting groove 9 is provided on the outer side of the upper connector 1 between every two adjacent supports 3. A locking groove 12 is provided on the outer side of the upper part of the lower connector 2 corresponding to each limiting groove 9. The lower part of the locking block 4 is located within the locking groove 12, and the upper part of the locking block 4 is located within the limiting groove 9. The locking block 4 is fixedly installed to the lower connector 2 by screws 6. Initially, the upper part of the locking block 4 is located below the limiting groove 9. After the lower connector 2 moves upward, it drives the locking block 4 to move upward along the limiting groove 9. The uppermost position of the locking block 4 is on the upper side of the limiting groove 9, limiting the opening degree of the support 3 and preventing excessive expansion and damage to the support 3 while achieving alignment.

[0023] Example 3: As shown in the attached document Figure 1-4 As shown, the retraction component is a circular spring 5. Each support 3 has a placement groove 13 on its upper outer side, and the circular spring 5 is installed in the placement groove 13. The circular spring 5 retracts the support 3 in all circumferential directions, which can cope with various force directions in wells with large inclination and horizontal wells.

[0024] Example 4: As shown in the appendix Figure 1-4 As shown, it also includes a locking pin 14, with the lower part of the upper connector 1 and the upper part of the lower connector 2 fixedly installed together by the locking pin 14. By setting the locking pin 14, it is possible to ensure that the tool will not accidentally open the support 3 and block it when it is lowered into the well. When the drill bit touches the bottom and the locking pin 14 is sheared, it can be straightened, making the device more stable.

[0025] Example 5: As shown in the attached document Figure 1-4 As shown in Figure 6, the bottom of the mounting groove 10 has an inclined guide surface 8. The guide surface 8 is provided to ensure that the support 3 can be opened smoothly and to avoid jamming.

[0026] The above technical features constitute various embodiments of the present invention, which have strong adaptability and implementation effect. Unnecessary technical features can be added or removed according to actual needs to meet the needs of different situations.

Claims

1. A centering device for coring tools in horizontal wells with high deviation, characterized in that... It includes an upper connector, a lower connector, and supports. The lower end of the upper connector is located inside the upper part of the lower connector. The lower part of the upper connector is provided with an annular groove. At least three supports are evenly distributed around the circumference of the lower outer part of the upper connector. The upper part of the supports is hinged to the upper connector. The lower connector is provided with a mounting groove corresponding to each support position. The supports are all located in the mounting groove. The upper connector and the lower connector are slidably connected. When the lower connector slides upward relative to the upper connector, it can open the support. A retractable part that can retract inward is installed on the support. The lower connector is provided with an inner annular platform. A return spring is provided between the upper part of the inner annular platform and the lower end of the upper connector.

2. The centering device for high-angle horizontal well coring tools according to claim 1, characterized in that... It also includes a locking block. A limiting groove is provided on the outer side of the upper connector between each two adjacent supports. A locking groove is provided on the outer side of the upper part of the lower connector corresponding to each limiting groove position. The lower part of the locking block is located in the locking groove, and the upper part of the locking block is located in the limiting groove. The locking block is fixedly installed together with the lower connector by screws.

3. The centering device for high-angle horizontal well coring tools according to claim 1 or 2, characterized in that... The retraction component is a circular spring, and each support has a placement groove on the upper outer side, in which the circular spring is installed.

4. The centering device for high-angle horizontal well coring tools according to claim 1 or 2, characterized in that... It also includes a locking pin, which secures the lower part of the upper connector to the upper part of the lower connector.

5. The centering device for high-angle horizontal well coring tools according to claim 3, characterized in that... It also includes a locking pin, which secures the lower part of the upper connector to the upper part of the lower connector.

6. The centering device for high-angle horizontal well coring tools according to claim 1, 2, or 5, characterized in that... The bottom of the mounting slot has an inclined guide surface.

7. The centering device for high-angle horizontal well coring tools according to claim 3, characterized in that... The bottom of the mounting slot has an inclined guide surface.

8. The centering device for high-angle horizontal well coring tools according to claim 4, characterized in that... The bottom of the mounting slot has an inclined guide surface.

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