Continuous drilling tool for ocean deepwater drilling

Abstract

The utility model discloses a continuous drilling tool for ocean deepwater drilling. The continuous drilling tool comprises a main body, a sleeve, a mandrel, a locking block, a locking block and a release ring, the inner surface of the body is provided with threads and screwed with the threads on the outer surface of the sleeve, a plurality of first through holes are distributed in the circumferential direction of the body, the locking blocks are located in the first through holes, a first containing groove is formed between the body and the sleeve, and the outer wall of the sleeve is provided with a wedge-shaped conical face with a downward inclined face. The mandrel is sleeved with the sleeve, a second containing groove is formed between the mandrel and the sleeve, a plurality of second through holes are distributed in the sleeve in the circumferential direction, the locking block is located in the second through holes, the release ring is located at the upper end of the locking block, and when the mandrel is locked, the front end of the locking block is located in the second containing groove. According to the utility model, the low-pressure conduit head can be tripped in once drilling and the drilling operation of the next borehole can be continued, so that the tripping times are reduced, the cost is saved, and the efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of offshore oil drilling equipment, and more specifically, to a continuous drilling tool for offshore deep-water drilling. Background Art

[0002] As countries around the world gradually strengthen their exploration of marine oil and gas, the underwater wellhead system, as a key equipment for marine oil and gas exploration and development, is becoming more and more widely used. The low-pressure catheter head running tool is a key component of the underwater wellhead system equipment. Under conventional operation conditions, each operation requires the low-pressure catheter head to be lowered separately with the low-pressure catheter head running tool, and then the tool is recovered, and then the drilling tool for the next wellbore is lowered. After the drilling is completed, the drill needs to be pulled up and down twice. With the increase in the operating water depth, the time for pulling up and down in marine drilling increases significantly. Taking the water depth of 1,500 meters as an example, it takes 8 to 12 hours to pull up and down once, which is extremely uneconomical for deepwater drilling platforms with a comprehensive daily cost of millions. The continued drilling tool can continue drilling after the low-pressure catheter head is lowered, and when pulling up, the continued drilling tool can be directly recovered, saving one trip to pull up and down.

[0003] Therefore, it is necessary to design and provide a drilling tool that can lower a low-pressure casing head in one trip and continue drilling and recovering, thereby reducing the number of trips, saving costs and improving offshore drilling efficiency. Utility Model Content

[0004] The utility model aims to provide a continuous drilling tool for deep-water marine drilling, which can realize the drilling of the low-pressure guide tube head in one trip and the continuous drilling of the next wellbore, thereby reducing the number of trips, saving costs and improving efficiency.

[0005] The technical solution adopted by the utility model to solve this technical problem is: to provide a continuous drilling tool for deep-water drilling in the ocean, comprising: a main body, a sleeve, a mandrel, a catheter head locking block assembly, a locking block, a release ring and an anti-rotation pin assembly;

[0006] The catheter head locking block assembly includes a locking block, the main body is a cavity structure, the inner surface of which is provided with a thread and is screwed with the thread of the outer surface of the sleeve, the main body is circumferentially distributed with a plurality of first through holes, the locking block is located in the first through hole, a first receiving groove is provided between the main body and the sleeve, and a wedge-shaped cone surface with a downward slope is provided on the outer wall of the sleeve, and the sleeve is rotated to move the wedge-shaped cone surface downward to push the locking block out, at which time the front end of the locking block is located in the first receiving groove;

[0007] The spindle is sleeved in the sleeve, a second receiving groove is provided between the spindle and the sleeve, a plurality of second through holes are distributed circumferentially on the sleeve, the locking block is located in the second through hole, the release ring is located at the upper end of the locking block, and when the spindle is locked, the front end of the locking block is located in the second receiving groove;

[0008] The anti-rotation pin assembly includes an anti-rotation pin, a coil spring and a second bolt. The anti-rotation pin is located in the groove on the side of the main body and is evenly arranged along the radial direction of the main body. One end of the coil spring is fixed to the bottom of the groove on the side of the main body, and the other end is movably connected to the anti-rotation pin. The second bolt is screwed into the end face of the main body, and the bottom face is located in the anti-rotation pin groove.

[0009] Preferably, in the above-mentioned continuous drilling tool for deep-water offshore drilling, the mandrel is a hollow shaft structure, with threads on the top and bottom, and a step on the lower part, which is arranged at the lower end of the sleeve;

[0010] A first rectangular groove is arranged on the outer surface of the bottom of the spindle, and the O-ring is installed in the first rectangular groove.

[0011] Preferably, the continuous drilling tool for deep-water offshore drilling comprises an anti-rotation block, which is located at the lower part of the spindle and connected to the spindle by bolts;

[0012] The bottom surface of the sleeve is provided with a U-shaped groove, and the anti-rotation block cooperates with the U-shaped groove.

[0013] Preferably, in the said continuous drilling tool for deep-water offshore drilling, the said catheter head lock block assembly comprises: a first bolt, an O-ring and a filter;

[0014] The locking blocks are evenly arranged along the radial direction of the main body. The locking blocks are cylindrical structures with step surfaces. A groove is provided on the side of the large-diameter cylinder, a locking groove is provided on the bottom surface, and a key groove is provided on the side of the small-diameter cylinder.

[0015] The first bolt is screwed into the end surface of the main body, and the bottom surface is located in the locking block groove. The O-ring is installed in the locking block groove, and the filter is installed on the oil filling hole of the main body.

[0016] Preferably, the further drilling tool for deep-water marine drilling comprises a separation sleeve, the inner surface of the separation sleeve is provided with a third accommodating groove, and the rear end of the locking block is located in the third accommodating groove.

[0017] Preferably, the continued drilling tool for deep-water marine drilling comprises a positioning cap, the inner surface of which is provided with two steps, the upper step abuts against the separation sleeve, the lower step abuts against the outside of the main body, and the positioning cap is connected to the main body by bolts.

[0018] Preferably, the continuous drilling tool for deep-water offshore drilling comprises an indicating sleeve, a limiting sleeve and an opening retaining ring;

[0019] The inner surface of the limiting sleeve is provided with a step surface that matches the top surface of the sleeve and the limiting sleeve is connected to the sleeve by bolts. The outer surface of the limiting sleeve is provided with a step surface that matches the indicating sleeve. The bottom surface of the limiting sleeve abuts against the release ring and the upper part is provided with a rectangular groove to accommodate the opening retaining ring.

[0020] Preferably, in the further drilling tool for deep-water marine drilling, a rectangular groove is provided on the upper portion of the main body, and the rectangular groove is located below the indicating sleeve.

[0021] Preferably, the continuous drilling tool for deep-water offshore drilling comprises a limit ring and a fixing pin, wherein the limit ring is a cylindrical structure, and an annular groove is designed on the outer cylindrical surface, and the fixing pin passes through the bottom of the main body and is connected to the annular groove;

[0022] A second rectangular groove is arranged on the upper surface of the limiting ring, and the O-ring is installed in the second rectangular groove.

[0023] Preferably, the continued drilling tool for deep-water marine drilling comprises a large-displacement reflux hole, which is a circumferentially distributed gap structure after the continued drilling tool locks the low-pressure guide tube head.

[0024] The utility model at least has the following beneficial effects:

[0025] 1. An anti-rotation pin structure is added to the main body to prevent the relative rotation between the drilling tool and the low-pressure guide tube head.

[0026] 2. A rectangular groove is added to the main body to match the indicator sleeve to quickly judge the tool status.

[0027] 3. The keyway of the locking block is improved into an annular groove (second receiving groove), and the newly designed anti-rotation block cooperates with the U-shaped groove to transmit torque, which greatly improves the upper limit of the transmitted torque.

[0028] 4. The drilling tool can be used to drill the low-pressure casing head in one trip and then continue drilling the next wellbore. Compared with conventional operation methods, it reduces one trip and saves drilling costs, improving the efficiency of offshore drilling.

[0029] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a rotating cross-sectional view of a continuous drilling tool for deep-water drilling in the ocean in the utility model;

[0031] Figure 2 It is a partial cross-sectional view of a continuous drilling tool for deep-water drilling in the ocean in the utility model;

[0032] Figure 3 This is a top view of a continuous drilling tool for deep-water drilling in the ocean in the utility model;

[0033] Explanation of the accompanying drawings: 1. main body, 1-1. rectangular groove, 2. sleeve, 21. first accommodating groove, 3. catheter head locking block assembly, 31. locking block, 32. first bolt, 33. O-ring, 34. filter, 4. indicating sleeve, 5. spindle, 51. second accommodating groove, 52. first rectangular groove, 6. anti-rotation block, 7. limiting ring, 71. ring groove, 72. second rectangular groove, 73. fixing pin, 8. separation sleeve, 81. third accommodating groove, 9. locking block, 10. release ring, 11. positioning cap, 12. limiting sleeve, 13. open retaining ring, 14. anti-rotation pin assembly, 141. anti-rotation pin, 142. coil spring, 143. second bolt, 15. large displacement reflux hole. DETAILED DESCRIPTION

[0034] The present invention will be further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0035] The following description is used to disclose the utility model so that those skilled in the art can implement the utility model. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles of the utility model defined in the following description can be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not deviate from the spirit and scope of the utility model.

[0036] Those skilled in the art should understand that, in the disclosure of the present invention, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0037] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0038] like Figure 1-3 As shown, a preferred embodiment of the utility model provides a continued drilling tool for deep-water marine drilling, including: a main body 1, a sleeve 2, a core shaft 5, a catheter head locking block assembly 3, a locking block 9, a release ring 10 and an anti-rotation pin assembly 14; the main body 1 is cylindrical, and cooperates with the low-pressure catheter head on the outside and cooperates with the sleeve 2 on the inside.

[0039] The catheter head locking block assembly 3 includes a locking block 31, the main body 1 is a cavity structure, the inner surface of which is provided with a thread and is screwed with the outer surface thread of the sleeve 2, the main body 1 is circumferentially distributed with a plurality of first through holes, the locking block 31 is located in the first through hole, a first receiving groove 21 is provided between the main body 1 and the sleeve 2, and a wedge-shaped cone surface with an inclined surface downward is provided on the outer wall of the sleeve 2, and the sleeve 2 is rotated to move the wedge-shaped cone surface downward to push the locking block 31 out, and at this time, the front end of the locking block 31 is located in the first receiving groove 21;

[0040] The spindle 5 is sleeved in the sleeve 2, and a second accommodating groove 51 is provided between the spindle 5 and the sleeve 2. A plurality of second through holes are circumferentially distributed on the sleeve 2. The locking block 9 is located in the second through hole, and the release ring 10 is located at the upper end of the locking block 9. When the spindle 5 is locked, the front end of the locking block 9 is located in the second accommodating groove 51, and the power for retracting the locking block 9 comes from the release ring 10 installed at the upper end of the locking block 9.

[0041] The anti-rotation pin assembly 14 includes an anti-rotation pin 141, a coil spring 142 and a second bolt 143. The anti-rotation pin 141 is located in the groove on the side of the main body 1 and is evenly arranged along the radial direction of the main body 1. One end of the coil spring 142 is fixed to the bottom of the groove on the side of the main body 1, and the other end is movably connected to the anti-rotation pin 141. The second bolt 143 is screwed into the end face of the main body 1, and the bottom face is located in the groove of the anti-rotation pin 141, which is used to axially limit the anti-rotation pin 141. The anti-rotation pin 141 abuts against the anti-rotation keyway of the low-pressure wellbore head to prevent the relative rotation of the main body 1 and the low-pressure wellbore head.

[0042] Furthermore, in the further drilling tool for deep-water marine drilling, the mandrel 5 is a hollow shaft structure with threads on the top and bottom. The top thread of the mandrel 5 is used to connect with the drill pipe, and the bottom thread is used to connect with the power drill assembly; a step is provided at the lower part, and the step is arranged at the lower end of the sleeve 2; the step on the mandrel 5 is used to bear the weight of the entire further drilling tool and the weight of the external guide tube head, and the whole set of tools can be recovered.

[0043] A first rectangular groove 52 is formed on the outer surface of the bottom of the spindle 5 , and an O-ring is installed in the first rectangular groove 52 .

[0044] Furthermore, the continuous drilling tool for deep-water offshore drilling comprises an anti-rotation block 6, which is located at the lower part of the spindle 5 and connected to the spindle 5 by bolts;

[0045] The bottom surface of the sleeve 2 is provided with a U-shaped groove, and the anti-rotation block 6 cooperates with the U-shaped groove. When the spindle 5 rotates, the sleeve 2 is driven to rotate by transmitting torque through the anti-rotation block 6.

[0046] Further, the said continuous drilling tool for deep-water offshore drilling, the said catheter head lock block assembly 3 comprises: a first bolt 32, an O-ring 33 and a filter 34;

[0047] The locking block 31 is evenly arranged along the radial direction of the main body 1. The locking block 31 is a cylindrical structure with a stepped surface. A groove is provided on the side of the large-diameter cylinder, a locking groove is provided on the bottom, and a key groove is provided on the side of the small-diameter cylinder. During operation, the locking groove on the bottom surface of the locking block 31 cooperates with the locking groove of the low-pressure catheter head. When the main shaft 5 is rotated forward, the sleeve 2 moves upward, and the locking block 31 can be retracted into the first accommodating groove 21, thereby realizing the release of the tool and the low-pressure catheter head.

[0048] The first bolt 32 is screwed into the end face of the main body 1, and the bottom face is located in the groove of the locking block 31, so as to axially limit the locking block 31; the O-ring 33 is installed in the groove of the locking block 31, so as to prevent mud and sand from entering the first receiving groove 21 through the gap between the locking block 31 and the through hole of the main body 1; the filter 34 is installed on the oil filling hole of the main body 1, and after the first receiving groove 21 is filled with oil, the filter 34 prevents mud and sand from entering the first receiving groove 21 from the oil filling hole.

[0049] Furthermore, the continuous drilling tool for deep-water drilling in the ocean comprises a separation sleeve 8, the inner surface of the separation sleeve 8 is provided with a third receiving groove 81, and the rear end of the locking block 9 is located in the third receiving groove 81. Under the tension of the release ring 10, the locking block 9 is held against the inner surface of the separation sleeve 8 or the third receiving groove 81.

[0050] Furthermore, the continuous drilling tool for deep-water drilling in the ocean includes a positioning cap 11, the inner surface of the positioning cap 11 is provided with two steps, the upper step abuts against the separation sleeve 8, and the lower step abuts against the outside of the main body 1, the positioning cap 11 is connected to the main body 1 by bolts, the countersunk holes uniformly distributed on the top of the positioning cap 11 are aligned with the threaded holes uniformly distributed on the top of the main body 1, and the two are fixed by bolts. The positioning cap 11 is used to provide locking and unlocking space for the locking block 9.

[0051] Furthermore, the continuous drilling tool for deep-water offshore drilling comprises an indicating sleeve 4, a limiting sleeve 12 and an opening retaining ring 13;

[0052] The inner surface of the limiting sleeve 12 is provided with a step surface that matches the top surface of the sleeve 2 and the limiting sleeve 12 is connected to the sleeve 2 by bolts. The outer surface of the limiting sleeve 12 is provided with a step surface that matches the indicating sleeve 4 to transmit the axial force to the indicating sleeve 4. The bottom surface of the limiting sleeve 12 abuts against the release ring 10 to prevent the axial movement of the release ring 10. The upper part is provided with a rectangular groove to accommodate the open retaining ring 13. The open retaining ring 13 is an open ring structure to prevent the axial movement of the indicating sleeve 4.

[0053] Furthermore, in the above-mentioned continuous drilling tool for deep-water drilling in the ocean, a rectangular groove 1-1 is provided on the upper part of the main body 1, and the rectangular groove 1-1 is located below the indicating sleeve 4. When the mandrel 5 moves upward, it drives the indicating sleeve 4 upward, and the rectangular groove 1-1 corresponding to the indicating sleeve 4 prompts different states of the continuous drilling tool.

[0054] Furthermore, the continuous drilling tool for deep-water drilling in the ocean comprises a limit ring 7 and a fixing pin 73, wherein the limit ring 7 is a cylindrical structure, and an annular groove 71 is designed on the outer cylindrical surface, and threaded holes are evenly distributed on the bottom of the main body 1, and the fixing pin 73 passes through the threaded holes at the bottom of the main body 1 and is connected to the annular groove 71;

[0055] The outer surface of the limiting ring 7 is provided with a second rectangular groove 72 , and the O-ring is installed in the second rectangular groove 72 and cooperates with the inner surface of the main body 1 .

[0056] Furthermore, the continued drilling tool for deep-water marine drilling comprises a large-displacement reflux hole 15, which is a circumferentially distributed gap structure after the continued drilling tool locks the low-pressure guide tube head, and is suitable for the working condition of large-displacement drilling fluid circulation.

[0057] During deep-water drilling in the ocean, the upper end of the mandrel 5 is connected to the drill pipe through a thread, and the lower end is connected to the drilling tool through a thread. The continued drilling tool is lowered into the catheter head, and the sleeve 2 is driven to rotate by rotating the mandrel 5, so that the wedge-shaped cone on the sleeve 2 moves downward to push the locking block 31 out. At this time, the front end of the locking block 31 is located in the first receiving groove 21, and the locking groove on the rear end cooperates with the locking groove on the inner wall of the catheter head to lock. The front end of the locking block 9 enters the second receiving groove 51, and the low-pressure catheter head is lowered to the wellbore position. After the catheter head is lowered into place, the rotation The drill pipe drives the spindle 5 to rotate, and the spindle 5 drives the sleeve 2 to rotate through the locking block 31. After rotating a specified number of times, the locking block 31 retracts, the tool is unlocked and separated from the low-pressure catheter head, and the spindle 5 continues to be rotated to a specified number of times. During this process, under the action of the release ring 10, the locking block 9 slides out of the second accommodating groove 51 of the spindle 5, and the spindle 5 is separated from the tool. The spindle 5 continues to descend with the drill bit to perform the next wellbore drilling operation. After the drilling is completed, the drill pipe drives the spindle 5 to be lifted, and the lower step of the spindle 5 will be recovered with the entire set of tools.

[0058] Although the implementation scheme of the utility model has been disclosed as above, it is not limited to the applications listed in the specification and implementation modes. It can be fully applied to various fields suitable for the utility model. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A continuous drilling tool for deep-water drilling in the ocean, characterized in that: include: Body, sleeve, mandrel, catheter head lock block assembly, locking block, release ring and anti-rotation pin assembly; The catheter head locking block assembly includes a locking block, the main body is a cavity structure, the inner surface of which is provided with a thread and is screwed with the thread of the outer surface of the sleeve, the main body is circumferentially distributed with a plurality of first through holes, the locking block is located in the first through hole, a first receiving groove is provided between the main body and the sleeve, and a wedge-shaped cone surface with a downward slope is provided on the outer wall of the sleeve, and the sleeve is rotated to move the wedge-shaped cone surface downward to push the locking block out, at which time the front end of the locking block is located in the first receiving groove; The spindle is sleeved in the sleeve, a second receiving groove is provided between the spindle and the sleeve, a plurality of second through holes are distributed circumferentially on the sleeve, the locking block is located in the second through hole, the release ring is located at the upper end of the locking block, and when the spindle is locked, the front end of the locking block is located in the second receiving groove; The anti-rotation pin assembly includes an anti-rotation pin, a coil spring and a second bolt. The anti-rotation pin is located in the groove on the side of the main body and is evenly arranged along the radial direction of the main body. One end of the coil spring is fixed to the bottom of the groove on the side of the main body, and the other end is movably connected to the anti-rotation pin. The second bolt is screwed into the end face of the main body, and the bottom face is located in the anti-rotation pin groove.

2. The continuous drilling tool for deep-water marine drilling according to claim 1, characterized in that: The spindle is a hollow spindle structure, with threads on the top and bottom, and a step on the bottom, which is arranged at the lower end of the sleeve; A first rectangular groove is arranged on the outer surface of the bottom of the spindle, and the O-ring is installed in the first rectangular groove.

3. The continuous drilling tool for deep-water marine drilling according to claim 1, characterized in that: It includes an anti-rotation block, which is located at the lower part of the spindle and connected to the spindle through bolts; The bottom surface of the sleeve is provided with a U-shaped groove, and the anti-rotation block cooperates with the U-shaped groove.

4. The continuous drilling tool for deep-water marine drilling according to claim 1, characterized in that: The catheter head locking block assembly comprises: a first bolt, an O-ring and a filter; The locking blocks are evenly arranged along the radial direction of the main body. The locking blocks are cylindrical structures with step surfaces. A groove is provided on the side of the large-diameter cylinder, a locking groove is provided on the bottom surface, and a key groove is provided on the side of the small-diameter cylinder. The first bolt is screwed into the end surface of the main body, and the bottom surface is located in the locking block groove. The O-ring is installed in the locking block groove, and the filter is installed on the oil filling hole of the main body.

5. The continuous drilling tool for deep-water offshore drilling according to claim 1, characterized in that: It comprises a separation sleeve, the inner surface of which is provided with a third accommodating groove, and the rear end of the locking block is located in the third accommodating groove.

6. The continuous drilling tool for deep-water offshore drilling according to claim 5, characterized in that: It comprises a positioning cap, the inner surface of which is provided with two steps, the upper step abuts against the separation sleeve, the lower step abuts against the outside of the main body, and the positioning cap is connected with the main body by bolts.

7. The continuous drilling tool for deep-water marine drilling according to claim 1, characterized in that: It includes an indicating sleeve, a limiting sleeve and an opening retaining ring; The inner surface of the limiting sleeve is provided with a step surface that matches the top surface of the sleeve and the limiting sleeve is connected to the sleeve by bolts. The outer surface of the limiting sleeve is provided with a step surface that matches the indicating sleeve. The bottom surface of the limiting sleeve abuts against the release ring and the upper part is provided with a rectangular groove to accommodate the opening retaining ring.

8. The continuous drilling tool for deep-water marine drilling according to claim 7, characterized in that: A rectangular groove is provided on the upper part of the main body, and the rectangular groove is located below the indicating sleeve.

9. The continuous drilling tool for deep-water offshore drilling according to claim 1, characterized in that: It includes a limiting ring and a fixing pin, the limiting ring is a cylindrical structure, the outer cylindrical surface is designed with a ring groove, and the fixing pin passes through the bottom of the main body and is connected with the ring groove; A second rectangular groove is arranged on the upper surface of the limiting ring, and the O-ring is installed in the second rectangular groove.

10. The continuous drilling tool for deep-water offshore drilling according to claim 1, characterized in that: It includes large-displacement reflux holes, which are circumferentially distributed gap structures after the drilling tool continues to lock the low-pressure catheter head.

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