WO2020215728A1

WO2020215728A1 - Packer capable of preventing unexpected release

Info

Publication number: WO2020215728A1
Application number: PCT/CN2019/122697
Authority: WO
Inventors: 付强; 李英松; 边杰; 褚建国; 宋立辉; 董社霞
Original assignee: 中国海洋石油集团有限公司; 中海油田服务股份有限公司
Priority date: 2019-04-25
Filing date: 2019-12-03
Publication date: 2020-10-29
Also published as: CN109915067A

Abstract

Disclosed is a packer capable of preventing unexpected release. The packer comprises a body; the body is configured such that a pipe (100) can pass through the body; an anchoring assembly (300) for setting is provided on the body; the packer further comprises a limiting mechanism; the limiting mechanism is fixed on the body; one end of the limiting mechanism is clamped between the anchoring assembly (300) and the pipe (100); the limiting mechanism is used for locking the anchoring assembly (300) before the pipe (100) is lifted to a preset height so as to keep setting of the packer.

Description

Packer capable of preventing accidental unblocking

Technical field

The embodiments of the present application relate to but are not limited to the field of oil exploration, and particularly relate to but not limited to a packer that prevents accidental unblocking.

Background technique

Packer is a safety control tool used for oil and gas well production. Its unblocking structure is relatively simple, usually by using pins or shear rings, that is, cutting off the pins to achieve unblocking. When the downhole pressure is too high, the packer will be unblocked accidentally, endangering production safety.

At present, packers used in offshore applications often encounter the above-mentioned failures, and the unsealing structure is started incorrectly, causing problems in well control safety.

Summary of the invention

The following is an overview of the topics detailed in this article. This summary is not intended to limit the scope of protection of the claims.

A packer capable of preventing accidental unsealing, comprising a body configured to be penetrated by a pipe string, an anchoring component for setting is arranged on the body, and the packer further includes a limiting mechanism, The limiting mechanism is fixed on the body, one end of the limiting mechanism is clamped between the anchor assembly and the pipe string, and the limiting mechanism is used to lift the pipe string to a preset height The anchor assembly is locked front to keep the packer set.

After reading and understanding the summary of the drawings and the implementation of the embodiments of the present application, other aspects can be understood.

Figure overview

Figure 1 is a schematic diagram of the assembled state of the packer;

Figure 2 is a schematic diagram of the setting state of the packer;

Figure 3 is a schematic diagram of the unblocking state of the packer;

Figure 4 is a schematic diagram of an elastic claw;

Figure 5 is a schematic diagram of the connector;

Figure 6 is a schematic cross-sectional view of the lower cone sleeve;

Figure 7 is a schematic diagram of the body.

Reference signs: 100-pipe string, 101-pipe string stub, 102-connector, 103-relief groove, 104-third slope, 105-first plane, 200-body, 201-center hole, 202-installation Groove, 203-screw hole, 300-anchor assembly, 301-lower taper sleeve, 302-outer slip, 303-slip frame, 304-upper taper, 305-rubber cylinder mechanism, 306-first slope, 307-Second Plane, 308-Fourth Slope, 309-Limiting Slot, 400-Limiting Mechanism, 401- Elastic Claw, 402- Screw, 403-Fixed End, 404-Limited End, 405-Fixed Hole, 406 -Connecting part, 407-second inclined plane, 408-third plane, 409-fifth inclined plane, 500-assembly clearance.

Detail

Hereinafter, the embodiments of the present application will be described in detail with reference to the drawings. It should be noted that the embodiments in this application and the features in the embodiments can be combined with each other arbitrarily if there is no conflict.

In the following description, many specific details are set forth in order to fully understand this application. However, this application can also be implemented in other ways different from those described here. Therefore, the protection scope of this application is not subject to the specific implementations disclosed below. Limitations of cases.

Some packers, when the downhole pressure is too high, will cause the pipe string to run up, cut off the pins, and directly cause the action of the unsealing structure, which will cause the packer to unblock accidentally and endanger production safety.

The embodiment of the present application provides a packer that prevents accidental unpacking. The packer can lock the anchoring component before the pipe string is raised to a preset height, thereby avoiding the premature unloading of the packer due to excessive downhole pressure. seal.

The packer of the present application will be described below in conjunction with examples.

Please refer to the packer of this embodiment shown in FIGS. 1-7. As shown in FIGS. 1-7, it includes a body 200 that can be penetrated by a pipe string 100. The pipe string 100 may be an oil pipe or other tubular body. The main body 200 is provided with an anchor assembly 300 for setting. A limit mechanism 400 is arranged between the anchor assembly 300 and the pipe string 100. The limit mechanism 400 can lock the anchor before the pipe string 100 is raised to a preset height. The assembly 300 is fixed to keep the packer in a setting state, so as to prevent the pipe string from running up due to downhole pressure and unpacking the packer in advance.

As shown in FIG. 7, the above-mentioned body 200 may be barrel-shaped, and it may be provided with a through central hole 201 for the pipe string 100 to pass through, so that the body 200 can be sleeved on the pipe string 100. As shown in FIGS. 1 to 3, the anchor assembly 300 sleeved on the body 200 may include a rubber cylinder mechanism 305, an upper cone sleeve 304, an outer slip 302, and a lower cone sleeve 301 arranged from top to bottom. , The glue cylinder mechanism 305, the upper cone sleeve 304 and the lower cone sleeve 301 can be sleeved on the body 200 and can slide along the length direction of the body 200 (ie the axial direction); and the outer slip 302 is provided on the upper cone sleeve 304 Between the lower taper sleeve 301 and the lower cone sleeve 301, the slip holder 303 is arranged outside the outer slip 302, which can limit the outer travel of the outer slip 302 to the outside. In addition, the upper cone sleeve 304 and the lower cone sleeve 301 are respectively fixed to the pipe string 100 by shear pins. As a result, the pipe string 100 and the packer as shown in FIG. 1 are assembled and then lowered. When setting is required, the pipe string 100 can be pressed to push the piston on the upper side of the rubber cylinder mechanism 305 to move downward. Push down and compress the glue cylinder mechanism 305, and the upper side of the glue cylinder mechanism 305 can also be provided with a stroke locking mechanism to restrict the piston from returning upward; the glue cylinder mechanism 305 transmits the downward force to the upper cone sleeve 304 , So that the shear pin fixing the upper cone sleeve 304 to the pipe string 100 is cut off, and the upper cone sleeve 304 continues to move downward; and the shear pin fixing the lower cone sleeve 301 to the pipe string 100 is fastened so that the lower cone sleeve 301 Withstand the outer slip 302, the outer slip 302 cannot move down, so that the outer slip 302 moves to the outside and is clamped on the casing wall; in addition, the rubber cylinder mechanism 305 continues to expand to realize the sealing of the upper and lower annulus of the packer , Complete the setting.

As shown in FIGS. 1 to 3, the above-mentioned pipe string 100 may include a plurality of pipe string stubs 101 that are connected end to end, and a connecting body 102 for connecting adjacent pipe string stubs 101, wherein the pipe string may be barrel-shaped. The two ends of the connecting body 102 are respectively sleeved on two adjacent pipe string short sections 101, and at least one connecting body 102 is provided at the lower end of the body 200.

Regarding the limit mechanism 400, as shown in FIGS. 1 to 3, a plurality of limit mechanisms 400 may be provided on the outer circumference of the above-mentioned pipe string 100, which are separated by the pipe string 100, and the plurality of limit mechanisms 400 can work together. Ensure that its effect is stable and will not fail due to excessive pressure. As shown in FIGS. 1 to 3, the outer periphery of the pipe string 100 may be provided with two limiting mechanisms 400, and the two limiting mechanisms 400 may be evenly distributed along the circumferential direction of the pipe string 100. It should be understood that the number of the limiting mechanism 400 is not limited to two, and may be one or more than two.

As shown in Figures 4 to 6, the limiting mechanism 400 can be made of spring steel (such as Inconel X-750), or can be made of other elastic metal materials. The limit mechanism 400 may include an elastic claw 401, and the elastic claw 401 may be a long strip, and the elastic claw 401 may be an integral structure or an inlaid metal block structure, which may include a fixed end 403 and a connecting portion arranged in sequence. 406 and the limiting end 404, and the connecting portion 406 connects the fixed end 403 and the limiting end 404.

The fixed end 403 can be fixed to the body 200. In a specific embodiment, the fixed end 403 may be provided with a fixing hole 405 for fixing with the main body 200. Correspondingly, as shown in FIG. 7, one end of the main body 200 may be provided with a mounting groove for installing the fixed end 403. 202, and the bottom of the mounting groove 202 is provided with a screw hole 203 corresponding to the fixing hole 405. The fixing end 403 may be arranged in the mounting groove 202, and the screw 402 may pass through the fixing hole 405 and then be screwed to the screw hole 203.

The thickness of the connecting portion 406 can be smaller than the thickness of the fixed end 403 and the limit end 404, which improves the elasticity of the elastic claw 401, and facilitates the elastic claw 401 to bend under force. As shown in FIGS. 1 to 3, the thickness of the connecting portion 406, the fixed end 403 and the limiting end 404 are arranged along the radial direction of the pipe string 100.

As shown in FIG. 4 and FIG. 6, the side of the limiting end 404 facing the lower cone sleeve 301 may be provided with a second inclined surface 407, a third flat surface 408 and a fifth inclined surface 409 that are connected. As shown in FIGS. 1 to 3, the elastic claw 401 is located inside the lower taper sleeve 301, and a second inclined surface 407, a third flat surface 408, and a fifth inclined surface 407, a third flat surface 408, and a fifth surface can be sequentially provided on the outer end surface of the limiting end 404 from top to bottom. Slope 409.

The inner side of the lower taper sleeve 301 is provided with a position-limiting groove 309, in which a first inclined surface 306, a second flat surface 307 and a fourth inclined surface 308, a first inclined surface 306, a second flat surface 307 and a fourth inclined surface 308 can be successively arranged in the groove It can be arranged in sequence from top to bottom, so that the end surface of the limiting end 404 facing the lower taper sleeve 301 is matched with the limiting groove 309, that is, when the limiting end 404 is in the limiting groove 309, its end surface is aligned with the limiting groove 309 fit.

As shown in Figure 5, a release groove 103 may be provided on the outer surface of the connecting body 102, wherein the release groove 103 may be provided with a third inclined surface 104 on one side of the groove wall, and the connecting body 102 may be provided with a third inclined surface 104 The first plane 105 connected by the inclined surface 104. As shown in FIGS. 1-3 and 5, the inner wall surface of the groove wall on the upper side of the release groove 103 may be a third inclined surface 104, and the upper side of the release groove 103 may be provided with a first flat surface 105, and the first flat surface 105 may be recessed in The outer surface of the connecting body 102.

Thus, as shown in Figure 1, after the packer is assembled, the fixed end 403 of the elastic claw 401 can be clamped between the body 200 and the lower taper sleeve 301, and the limit end 404 of the elastic claw 401 can extend downward. Between the connecting body 102 and the lower taper sleeve 301, one side of the limiting end 404 (the side facing outward) can be set in the limiting groove 309, and the other side (the side facing inward) protruding from the limiting groove 309 is attached to the first plane 105, the taper sleeve 301 can be lowered in the upper limit in the vertical direction, and the release groove 103 is located on the lower side of the limit groove 309. In addition, an assembly gap 500 may be provided between the main body 200 and the connecting body 102 to provide space for the pipe string 100 to be lifted up. As shown in Figure 2, when the packer is set, the limit end 404 is still set in the limit groove 309, and the limit groove 309 is buckled to lock the position of the lower cone sleeve 301 to ensure setting. The downhole pressure may cause the tubing string 100 to cut off the shear pins that fix the lower cone 301 to the tubing string 100 and move upwards, but the downhole pressure is not enough to make the tubing string 100 move up to a preset height, that is, not enough to release the groove 103 The third inclined surface 104 moves up to the limit end 404 to ensure setting and prevent the downhole pressure from causing premature unsealing. When unsealing is required, as shown in FIG. 3, the pipe string 100 needs to be lifted to a preset height, and the main body 200 and the connecting body 102 underneath it collide, and in the process, the release groove 103 moves upward to limit the position. The end 404 is at the notch of the release groove 103, and because the lower cone sleeve 301 receives the downward force exerted by the outer slip 302, the first inclined surface 306 of the lower cone sleeve 301 will squeeze the second inclined surface 407 of the limit end 404 , Make the elastic claw 401 bend, the limit end 404 bends into the release groove 103, and escapes from the limit groove 309, and no longer limits the lower taper sleeve 301, so that the lower taper sleeve 301 moves down and drives the outer slip 302 to retract , The glue cylinder mechanism 305 stretches and moves down to complete the unsealing.

The third slope 104 can also facilitate the recycling and installation of equipment. After the packer is unsealed and recovered, when it is assembled and used again, the arrangement of the third inclined surface 104 facilitates the installation of the elastic claw 401 in place.

In some embodiments, the fixed end 403 can be inserted into the body 200 and fixed with screws, which is convenient for assembly. In other embodiments, the fixed end 403 may be welded to the body 200.

In some embodiments, the above-mentioned relief groove 103 may be provided on the outer surface of the pipe string short section 101 instead of being provided on the connecting body 102. In a specific embodiment, the pipe string short section 101 may be provided with a protrusion protruding from the outer surface thereof, and the protrusion may cooperate with the lower cone sleeve 301 to clamp the limit end 404 of the elastic claw 401. The relief groove 103 may be provided on the protrusion or at other positions on the outer surface of the pipe string short section 101 except for the protrusion.

In combination with the above embodiments, the limit mechanism of the embodiment of the present application can lock the anchoring assembly before the pipe string is raised to a preset height, thereby avoiding the premature unsealing of the packer caused by excessive downhole pressure. The limiting mechanism of the embodiment of the present application may include an elastic claw made of a metal material with elastic deformation, and corresponding limiting grooves and release grooves. The structure is simple, the installation is convenient, and it is also conducive to production. In the embodiment of the present application, the groove wall of the limiting groove is provided with a first inclined surface, and the limiting end is provided with a second inclined surface relative to the first inclined surface, which facilitates the pressing of the elastic claw to smoothly bend the releasing groove. The release groove of the embodiment of the present application is provided on the outer surface of the connecting body, which facilitates production and effectively reduces costs. The outer circumference of the pipe string in the embodiment of the present application is provided with a plurality of limit mechanisms, and the plurality of limit mechanisms work together to ensure stable action and prevent failure due to excessive pressure.

In the description of this application, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral Connection; it can be directly connected or indirectly connected through an intermediary. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiments or examples are included in this application In at least one embodiment or example. In this specification, the schematic representations of the above-mentioned terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner.

Those skilled in the art should understand that although the implementation manners disclosed in the embodiments of the present application are as described above, the content described is only the implementation manners used to facilitate the understanding of the embodiments of the present application, and is not intended to limit the embodiments of the present application. Any person skilled in the art of the embodiments of this application can make any modifications and changes in the implementation form and details without departing from the spirit and scope disclosed in the embodiments of this application. The scope of patent protection is still subject to the scope defined by the appended claims.

Claims

A packer capable of preventing accidental unsealing, comprising a body configured to be penetrated by a pipe string, and an anchoring component for setting is arranged on the body,

The packer also includes a limiting mechanism, the limiting mechanism is fixed on the body, one end of the limiting mechanism is clamped between the anchoring assembly and the pipe string, and the limiting mechanism is used for The anchor assembly is locked to keep the packer set before the pipe string is raised to a preset height.
The packer for preventing accidental unblocking of claim 1, wherein the limiting mechanism comprises a fixed end and a limiting end connected, the fixed end is arranged on the body, and the limiting end Extending downward and clamped between the anchoring assembly and the pipe string, the anchoring assembly is provided with a limiting groove for buckling the limiting end to lock the anchoring assembly; A release groove is provided on the outer surface, and when the pipe string is raised to a preset height, the release groove corresponds to the limit groove, and is used to make the limit end separate from the limit groove to achieve a solution. seal.
The packer for preventing accidental unblocking of claim 2, wherein the limiting groove is provided with a first inclined surface on the groove wall on the side close to the fixed end, and the limiting end is opposite to the first inclined surface. One inclined surface is provided with a second inclined surface.
The packer for preventing accidental unblocking according to claim 2, wherein the outer surface of the body is provided with a mounting groove, and the fixed end is arranged in the mounting groove.
The packer for preventing accidental unblocking according to claim 2, wherein the limiting mechanism comprises an elastic claw, and both ends of the elastic claw in the length direction constitute the fixed end and the limiting end, respectively.
The packer for preventing accidental unblocking according to claim 5, wherein the elastic claw comprises a connecting part between the fixed end and the limiting end, and the thickness of the connecting part is smaller than that of the fixed end. The thickness of the end is smaller than the thickness of the limit end.
The packer for preventing accidental unblocking of claim 5, wherein the elastic claw is made of a metal material with elastic deformation.
The packer for preventing accidental unblocking of claim 3, wherein the outer contour of the limiting end on the side opposite to the anchoring component matches the inner surface of the limiting groove.
The packer for preventing accidental unblocking of claim 2, wherein the release groove is provided with a third inclined surface on the groove wall on the side close to the fixed end.
The packer for preventing accidental unblocking according to any one of claims 2-9, wherein the pipe string includes a plurality of pipe string stubs and a connecting body connecting adjacent pipe string stubs, and the connecting body The two ends are respectively sleeved on two adjacent pipe string short sections, and the release groove is arranged on the outer surface of the connecting body.
The packer for preventing accidental unblocking according to any one of claims 1-9, wherein a plurality of the limiting mechanisms are provided in the circumferential direction of the pipe string.
The packer for preventing accidental unblocking according to any one of claims 2-9, wherein the release groove is located on the lower side of the limiting groove before the pipe string is raised to a predetermined height.