Open hole shaft plugging tool

Abstract

The invention discloses an open hole shaft plugging tool. The problems that an existing open hole well cementing plug is long in well plugging construction period and poor in cement paste cementing quality are mainly solved. The plugging tool is characterized in that the lower end of a feeding rod (1) is connected with a lower releasing short circuit (4), an anchoring mechanism is arranged outside the lower releasing short circuit (4), the lower portion of the lower releasing short circuit (4) is connected with an upper plugging tool connector (18), the interior of the upper plugging tool connector (18) is in threaded connection with a plugging tool body (31), and the interior of the plugging tool body (31) is connected with a compression sleeve (19) through a compression sleeve descending shear pin (27); the interior of the compression sleeve (19) is in threaded connection with an isolation valve body (21); a rubber sleeve (29) is arranged outside the plugging tool body (31), and a compression outer sleeve (26) is arranged on the upper portion of the rubber sleeve (29). The open hole shaft plugging tool can be released after being anchored at a preset position in an expansion sealing mode, the functions of an open hole bridge plug and an artificial shaft bottom are achieved, the cementation quality of a cement plug is improved, and the construction time is shortened.

Description

Technical Field

[0001] The invention relates to the technical field of drilling engineering, in particular to a plugging tool for an open hole wellbore. Background Art

[0002] During the drilling and development of oil fields, after drilling and logging, some oil wells were found to have poorly developed lower oil layers, so only the upper oil layers were retained. In order to save drilling costs, the casing was only lowered to the bottom of the upper oil layer. During cementing, the density of cement slurry was greater than the density of drilling fluid, causing cement slurry to displace and sink with drilling fluid, resulting in leakage in the upper well section and unqualified cementing quality at the bottom corner of the casing. For this reason, cement plugs need to be used to seal and scrap the lower well section, which results in long construction periods and high costs.

[0003] At the same time, in deep drilling and development, there will be situations where open-hole side drilling is required. At this time, it is necessary to use a bent screw to perform side drilling after the cement plug is suspended. This requires high-quality cement plugs. When the cement plug is drilled, the density difference between the cement slurry and the drilling fluid causes the cement slurry to become unstable and cause poor bonding quality. In addition, some cement slurry is mixed into the drilling fluid, causing the drilling fluid to calcify and deteriorate, which increases the cost and workload of processing the drilling fluid. Summary of the invention

[0004] In order to overcome the problems of long construction period and poor cement slurry bonding quality of existing open hole well cement plugging, the present invention provides an open hole wellbore plugging tool, which can anchor the tool in a predetermined position and then release it, thereby playing the role of an open hole bridge plug and an artificial well bottom, improving the cement plug bonding quality and shortening the construction time, and can also be used for scrapping and plugging of open hole wellbores.

[0005] The technical solution of the present invention is: a naked wellbore plugging tool, including a running rod, the lower end of the running rod is connected to a lower short-circuit of a releasing hand, an anchoring mechanism is arranged outside the lower short-circuit of the releasing hand, the lower part of the lower short-circuit of the releasing hand is connected to an upper joint of the plugging tool, an anchoring liquid cylinder is arranged outside the upper joint of the plugging tool; the upper joint of the plugging tool is internally threadedly connected to a plugging tool body, the interior of the plugging tool body is connected to a compression sleeve through a compression sleeve downward shear pin, the interior of the compression sleeve is threadedly connected to an isolation valve body, the interior of the isolation valve body is connected to an isolation valve core through an isolation valve shear pin; a rubber sleeve is arranged outside the plugging tool body, a compression sleeve is arranged on the upper part of the rubber sleeve, and a positioning sleeve is connected to the lower end of the interior of the plugging tool body.

[0006] The lower end of the delivery rod is located inside the lower short-circuit of the release hand, a block is provided on the side wall of the lower short-circuit of the release hand, the inside of the block is located in the groove of the outer wall of the delivery rod, a release cylinder is provided outside the block, and the release cylinder is connected to the lower short-circuit of the release hand through a release pin.

[0007] The anchoring mechanism comprises an upper connecting ring of the anchor rod and a lower connecting ring of the anchor rod. The upper connecting ring of the anchor rod is connected to the lower short-circuit of the throwing hand, and the lower connecting ring of the anchor rod is connected to the anchoring liquid cylinder; a plurality of anchor rods are connected between the upper connecting ring of the anchor rod and the lower connecting ring of the anchor rod.

[0008] The anchor rod comprises an upper anchor rod and a lower anchor rod, wherein the upper anchor rod and the lower anchor rod are connected via an anchor rod rotating pin, the upper anchor rod is connected to the lower end of the upper connecting ring via an upper retaining ring connecting pin, and the lower anchor rod is connected to the upper end of the lower connecting ring of the anchor rod via a lower retaining ring connecting pin.

[0009] The side wall of the isolation valve body is provided with a valve body liquid through hole, and the side wall of the isolation valve core is provided with a valve core liquid through hole. When the isolation valve body is connected to the isolation valve core, the two liquid through holes are communicated.

[0010] The outer surface of the isolation valve core is provided with an isolation valve retaining spring, and the inner wall of the isolation valve body is provided with a retaining groove corresponding to the isolation valve retaining spring.

[0011] The compression sleeve is provided with a compression sleeve shear pin positioning sleeve, and the compression sleeve shear pin positioning sleeve is internally connected with a compression expansion rubber sleeve shear pin. An axial groove is opened on the side wall of the plugging tool. After the compression expansion rubber sleeve shear pin passes through the groove on the side wall of the plugging tool, its end is located on the outer wall of the compression sleeve.

[0012] The inner wall of the compression sleeve is provided with a rubber cylinder retaining spring, and the outer wall of the plugging tool body is provided with a retaining groove corresponding to the rubber cylinder retaining spring.

[0013] The outer surface of the compression sleeve is provided with a compression sleeve retaining spring, and the inner wall of the plugging tool body is provided with a retaining groove corresponding to the compression sleeve retaining spring.

[0014] The lower part of the anchoring fluid cylinder is threadedly connected to the anchoring stop ring, and the upper joint of the plugging tool is connected to the anchoring stop ring through an anchoring opening pin.

[0015] The present invention has the following beneficial effects: due to the adoption of the above scheme, the plugging tool is lowered into the designed position of the wellbore through the drill pipe, and the ball is thrown into the drill pipe to hold the pressure to expand and anchor the tool at the predetermined position and then released, thereby playing the role of an open hole bridge plug and an artificial well bottom, which is used to scrap the lower well section, and can improve the bonding quality of the cement plug, shorten the construction time, and can also be used for scrapping and plugging of open hole wellbores. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram after the blocking construction.

[0017] In the figure, 1-feeding rod, 2-block, 3-release cylinder, 4-release lower short circuit, 5-release pin, 6-anchor rod upper connecting ring, 7-upper stop ring connecting pin, 8-upper anchor rod, 9-lower anchor rod, 10-anchor rod rotating pin, 11-anchor lower connecting ring, 12-elastic sleeve, 13-anchor connecting ring, 14-anchor cylinder, 15-anchor stop ring, 16-anchor retaining spring, 17-anchor opening pin, 18-blocking tool upper Connector, 19-compression sleeve, 20-isolating valve retaining spring, 21-isolating valve body, 22-isolating valve shear pin, 23-isolating valve core, 24-compression sleeve shear pin positioning sleeve, 25-expansion rubber cylinder shear pin, 26-compression sleeve, 27-compression sleeve downward shear pin, 28-rubber cylinder stop retaining spring, 29-rubber cylinder, 30-compression sleeve stop retaining spring, 31-plugging tool body, 32-positioning sleeve, 33-guide shoe, 34-lower retaining ring connecting pin. Implementation

[0018] The present invention will be further described below in conjunction with the accompanying drawings: Depend on Figure 1 , Figure 2 As shown, a plugging tool for an open hole wellbore comprises a running rod 1, the upper end of the running rod 1 is connected to a drilling tool, the lower end of the running rod 1 is connected to a lower short-circuit 4 for releasing the hand, the running rod 1 and the lower short-circuit 4 for releasing the hand are connected through a stopper 2, the lower end of the running rod 1 is located inside the lower short-circuit 4 for releasing the hand, a groove is provided on the outer surface of the running rod 1, a plurality of stoppers 2 are provided on the side wall of the lower short-circuit 4 for releasing the hand, the inside of the stopper 2 is located in the groove on the surface of the running rod 1, and a release hydraulic cylinder 3 is provided outside the stopper 2, the release hydraulic cylinder 3 keeps the stopper 2 in the groove, thereby connecting the running rod 1 and the lower short-circuit 4 for releasing the hand. The lower end of the release cylinder 3 is connected to the lower short-circuit 4 of the release hand through the release pin 5. When the release pin 5 is cut off, the release cylinder 3 can slide down along the lower short-circuit 4 of the release hand, so that the stopper 2 is exposed, and the stopper 2 is released from the side wall of the lower short-circuit 4 of the release hand and the groove on the surface of the feeding rod 1, so that the feeding rod 1 is separated from the lower short-circuit 4 of the release hand.

[0019] The lower part of the lower short-circuit 4 of the release hand is threadedly connected to the upper joint 18 of the plugging tool. The upper joint 18 of the plugging tool is provided with an anchoring fluid cylinder 14 on the outside. The lower part of the anchoring fluid cylinder 14 is threadedly connected to the anchoring stop ring 15, and the upper joint 18 of the plugging tool and the anchoring stop ring 15 are connected by an anchoring opening pin 17. A liquid inlet hole is opened on the side wall of the upper joint 18 of the plugging tool, and the liquid inlet hole is communicated with the anchoring fluid cylinder 14. An anchoring mechanism is provided on the outside of the lower end of the lower short-circuit 4 of the release hand, and the lower end of the anchoring mechanism is located outside the upper joint 18 of the plugging tool. The anchoring mechanism includes an upper connecting ring 6 of the anchor rod and a lower connecting ring 11 of the anchor rod. The upper connecting ring 6 of the anchor rod is threadedly connected to the lower short-circuit 4 of the release hand, and the lower connecting ring 11 of the anchor rod is connected to the anchoring fluid cylinder 14. The anchor rod lower connecting ring 11 is connected to the anchor liquid cylinder 14 through the anchor connecting ring 13. The anchor connecting ring 13 is a two-half ring structure, which is welded into a whole after being buckled through a slot. An elastic sleeve 12 is provided between the lower end surface of the anchor rod lower connecting ring 11 and the upper end surface of the anchor liquid cylinder 14. The elastic sleeve 12 is a rubber part, and the anchor connecting ring 13 wraps the elastic sleeve 12 inside. Several anchor rods are connected between the anchor rod upper connecting ring 6 and the anchor rod lower connecting ring 11. The number of anchor rods is preferably 3, which are evenly distributed along the circumferential direction. The anchor rod comprises an upper anchor rod 8 and a lower anchor rod 9, wherein the upper anchor rod 8 and the lower anchor rod 9 are connected by an anchor rod rotating pin 10 so that the two can rotate relative to each other. The upper anchor rod 8 is connected to the lower end of the upper connecting ring 6 by an upper retaining ring connecting pin 7, and the lower anchor rod 9 is connected to the upper end of the anchor rod lower connecting ring 11 by a lower retaining ring connecting pin 34. In this way, when the anchor rod is subjected to axial force, the middle parts of the upper and lower anchor rods can extend outward, thereby being anchored on the inner wall of the wellbore.

[0020] The plugging tool upper joint 18 is internally threadedly connected to the plugging tool body 31, and the plugging tool body 31 is internally connected to the compression sleeve 19 through the compression sleeve downward shear pin 27. The compression sleeve 19 is internally threadedly connected to the isolation valve body 21, and the isolation valve core 23 is provided inside the isolation valve body 21, and the two are connected through the isolation valve shear pin 22. The outer surface of the isolation valve core 23 is provided with an isolation valve retaining spring 20, and the inner wall of the isolation valve body 21 is provided with a groove corresponding to the isolation valve retaining spring 20; the side wall of the isolation valve body 21 is provided with a valve body liquid through hole, and the side wall of the isolation valve core 23 is provided with a valve core liquid through hole. When the isolation valve retaining spring 20 is located in the groove on the inner wall of the isolation valve body 21, the isolation valve body 21 is connected to the isolation valve core 23, and the two liquid through holes are communicated.

[0021] The plugging tool body 31 is provided with a rubber cylinder 29 on the outside, and a compression sleeve 26 is provided on the upper part of the rubber cylinder 29. The side wall of the compression sleeve 26 is provided with a plurality of circular holes, and a compression sleeve shear pin positioning sleeve 24 is provided in the circular hole. The compression sleeve shear pin positioning sleeve 24 is connected with a compression-expanding rubber cylinder shear pin 25 inside. The side wall of the plugging tool 31 is provided with an axial groove, and the end of the compression-expanding rubber cylinder shear pin 25 is located on the outer wall of the compression sleeve 19 after passing through the groove of the side wall of the plugging tool 31. The compression-expanding rubber cylinder shear pin 25 can move axially along the groove of the side wall of the plugging tool 31. The inner wall of the compression sleeve 26 is provided with a rubber cylinder stop spring 28, and the outer wall of the plugging tool body 31 is provided with a slot corresponding to the rubber cylinder stop spring 28. The outer surface of the compression sleeve 19 is provided with a compression sleeve stop spring 30, and the inner wall of the plugging tool body 31 is provided with a slot corresponding to the compression sleeve stop spring 30.

[0022] The lower end of the plugging tool body 31 is connected with a positioning sleeve 32, and the compression sleeve 19 can sit on the positioning sleeve 32 when moving downward. The lower end of the plugging tool body 31 is connected with a guide shoe 33.

[0023] When plugging the wellbore, the delivery rod 1 is connected to the lower end of the drilling tool, lowered into the pre-set position in the open hole wellbore, and the ball is thrown. The steel ball falls into the isolation valve core 23, closing the inner hole of the valve core. After the pressure is increased by 5Mpa, the isolation valve core 23 cuts off the isolation valve shear pin 22 and moves downward, closing the isolation valve core 23 and the liquid hole on the side wall of the isolation valve body 21. Continue to increase the pressure to 10Mpa, the compression sleeve 19 cuts off the compression sleeve downward shear pin 27 and moves downward, and drives the compression sleeve 26 to pressurize the rubber cylinder 29 through the compression sleeve shear pin 25, thereby sealing the open hole wellbore; after completion, the compression sleeve 26 and the plugging tool body 31 are locked by the rubber cylinder stop spring 28. Continue to increase the pressure to 12Mpa, the compression sleeve 19 cuts off the compression sleeve shear pin 25, continues to move downward to the positioning inner sleeve 32, and is locked with the plugging tool body 31 through the compression sleeve stop spring 30. Continue to increase the pressure to 15MPa, the anchoring cylinder 14 cuts off the anchoring opening pin 17 and moves upward, pushing the lower anchoring rod 9 to extend and then support it into the open hole wellbore. After the anchoring is completed, the anchoring stop ring 15 is automatically locked with the upper joint 18 of the plugging tool through the anchoring clamp 16. Continue to increase the pressure to 18MPa, the release cylinder 3 cuts off the release pin 5 and moves downward, the stopper 2 loses its limit, and the drilling tool is lifted up to bring out the delivery rod 1, realizing the release of the drilling tool. At this time, the pressure will be released and the construction is completed.

Claims

1. A plugging tool for an open hole wellbore, comprising a running rod (1), characterized in that: The lower end of the delivery rod (1) is connected to a lower short-circuit (4) of the release arm, an anchoring mechanism is provided on the outside of the lower short-circuit (4), the lower part of the release arm is connected to an upper joint (18) of the plugging tool, and an anchoring fluid cylinder (14) is provided on the outside of the upper joint (18) of the plugging tool; the upper joint (18) of the plugging tool is internally threadedly connected to a plugging tool body (31), the inside of the plugging tool body (31) is connected to a compression sleeve (19) via a compression sleeve downward shear pin (27), the inside of the compression sleeve (19) is internally threadedly connected to an isolation valve body (21), and the inside of the isolation valve body (21) is connected to an isolation valve core (23) via an isolation valve shear pin (22); a rubber sleeve (29) is provided on the outside of the plugging tool body (31), a compression sleeve (26) is provided on the upper part of the rubber sleeve (29), and a positioning sleeve (32) is connected to the lower end of the plugging tool body (31).

2. The open hole wellbore plugging tool according to claim 1, characterized in that: The lower end of the delivery rod (1) is located inside the lower short-circuit (4) of the release arm, a stopper (2) is provided on the side wall of the lower short-circuit (4), the inside of the stopper (2) is located in a groove on the outer wall of the delivery rod (1), a release cylinder (3) is provided outside the stopper (2), and the release cylinder (3) is connected to the lower short-circuit (4) of the release arm via a release pin (5).

3. The open hole wellbore plugging tool according to claim 1, characterized in that: The anchoring mechanism comprises an upper connecting ring (6) of an anchor rod and a lower connecting ring (11) of an anchor rod. The upper connecting ring (6) of the anchor rod is connected to a lower short-circuit (4) of a throwing hand, and the lower connecting ring (11) of the anchor rod is connected to an anchoring fluid cylinder (14). A plurality of anchor rods are connected between the upper connecting ring (6) of the anchor rod and the lower connecting ring (11).

4. The open hole wellbore plugging tool according to claim 3, characterized in that: The anchor rod comprises an upper anchor rod (8) and a lower anchor rod (9), wherein the upper anchor rod (8) and the lower anchor rod (9) are connected via an anchor rod rotation pin (10), the upper anchor rod (8) is connected to the lower end of the upper connecting ring (6) via an upper retaining ring connecting pin (7), and the lower anchor rod (9) is connected to the upper end of the anchor rod lower connecting ring (11) via a lower retaining ring connecting pin (34).

5. The open hole wellbore plugging tool according to claim 1, characterized in that: The isolation valve body (21) has a valve body liquid passage hole on its side wall, and the isolation valve core (23) has a valve core liquid passage hole on its side wall. When the isolation valve body (21) and the isolation valve core (23) are connected, the two liquid passage holes are in communication.

6. The open hole wellbore plugging tool according to claim 5, characterized in that: An isolation valve retaining spring (20) is provided on the outer surface of the isolation valve core (23), and a retaining groove corresponding to the isolation valve retaining spring (20) is provided on the inner wall of the isolation valve body (21).

7. The open hole wellbore plugging tool according to claim 1, characterized in that: The compression sleeve (26) is provided with a compression sleeve shear pin positioning sleeve (24), the compression sleeve shear pin positioning sleeve (24) is internally connected with a compression expansion rubber sleeve shear pin (25), an axial groove is formed on the side wall of the plugging tool (31), and the end of the compression expansion rubber sleeve shear pin (25) is located on the outer wall of the compression sleeve (19) after passing through the groove on the side wall of the plugging tool (31).

8. The open hole wellbore plugging tool according to claim 1, characterized in that: The inner wall of the compression sleeve (26) is provided with a rubber cartridge retaining spring (28), and the outer wall of the plugging tool body (31) is provided with a retaining groove corresponding to the rubber cartridge retaining spring (28).

9. The open hole wellbore plugging tool according to claim 1, characterized in that: The outer surface of the compression sleeve (19) is provided with a compression sleeve retaining spring (30), and the inner wall of the plugging tool body (31) is provided with a retaining groove corresponding to the compression sleeve retaining spring (30).

10. The open hole wellbore plugging tool according to claim 1, characterized in that: The lower portion of the anchoring fluid cylinder (14) is threadedly connected to the anchoring stop ring (15), and the upper joint (18) of the plugging tool is connected to the anchoring stop ring (15) via an anchoring opening pin (17).

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