CN120026849A - Anchored packer release tool - Google Patents

Abstract

The invention belongs to the technical field of downhole tools, and particularly relates to an anchoring packer releasing tool. The anchoring packer releasing tool comprises a base pipe, a moving assembly, a central pipe, a ball seat and a locking block, wherein a connecting hole is formed in the pipe wall of the base pipe, the moving assembly is arranged on the outer side of the base pipe and used for anchoring and/or packing in response to pressure transmitted by the connecting hole, the pressure transmitting hole is formed in the pipe wall of the central pipe, the pressure transmitting hole is communicated with the connecting hole, the ball seat is arranged in the central pipe through a shearing pin, the locking block radially penetrates through the pipe wall of the central pipe, the first end of the locking block is radially abutted with the ball seat, the second end of the locking block is located in the base pipe, so that the base pipe and the central pipe are locked, the ball seat moves relative to the central pipe in the second state, the radial abutment of the locking block is released, and the locking block is separated from the base pipe, and the central pipe is separated from the base pipe.

Description

Anchor seals separates release instrument

Technical Field

The invention belongs to the technical field of downhole tools, and particularly relates to an anchoring packer releasing tool.

Background

The secondary branch well is usually completed by an open hole during completion, and borehole collapse is easy to occur due to the influence of formation stress change during later production, so that productivity is reduced.

At present, well completion modes of screen running in a secondary branch wellbore are generally used to avoid wellbore collapse, but the screen runs axially in the wellbore without a special release anchoring tool after screen running. When the branch well is drilled in the branch well and is fed into the screen pipe, and the main well is drilled in the follow-up process, if the screen pipe in the branch well is not anchored, the screen pipe can slide out of the branch well due to vibration generated during drilling, so that problems such as blockage and jamming are caused.

In addition, if the branch wellbore has a sand production problem, formation sand may enter the main wellbore axially outside the screen, affecting the later production and the later production.

Chinese patent document CN104481438B discloses a branching well open hole anchoring tieback completion process and a liner running tool therefor. The method comprises the steps of connecting an open hole tieback tube at the uppermost part of a tail tube tubular column, connecting an open hole anchor between any sleeve between a bottom ball seat and the open hole tieback tube, putting a tail tube running tool, the open hole tieback tube, the open hole anchor, the bottom ball seat and a tail tube completion tubular column into a preset position in a well, putting a first ball into the well, holding pressure to open the open hole anchor, anchoring the whole tubular column in the well, continuously increasing pressure to enable the bottom ball seat to be penetrated again, and reestablishing circulation. The patent relates to a tool which needs to be matched with other tool parts for use, and the operation process is complex.

Chinese patent document CN202882816U discloses an oilfield drilling and completion tool. The slip seat of the tool is fixed on a central tube I through screws, the slips and the support rods are arranged at reserved positions among the central tube I, the slip seat and the lengthened two-stage pushing cylinder, the lengthened two-stage pushing cylinder is fixed on the central tube I through pins, the force transmission cylinder is connected with the lengthened two-stage pushing cylinder through threads, an anti-withdrawal ring is arranged between the force transmission cylinder and the lengthened two-stage pushing cylinder, a sawtooth buckle is designed on the central tube I and matched with the anti-withdrawal ring, a hydraulic cylinder and a piston are connected with the force transmission cylinder through a central tube II, a releasing mechanism is connected to the lower part of the central tube II, and a drill rod buckle is designed on the upper part of the hydraulic cylinder and can be connected with a drill rod. The utility model realizes the well completion of the screen pipe suspension, has good stability and simple structure, improves the stability of the wall of the fishbone well, improves the well completion quality of the fishbone branch well and prolongs the production period of the fishbone well. The anchoring of the screen pipe string in the branch well bore can be realized, but the tool does not have a packing function, stratum sand cannot be prevented from entering the main well bore from an annular gap between the tool and the stratum, and the structure is complex.

The Chinese patent document CN102418503B discloses a branch well screen pipe anchoring compensation device which consists of four parts of hydraulic setting, releasing, compensation and anchoring, and four main functions of a double-stage hydraulic cylinder, rotary anchoring, lifting or rotary releasing, drillable compensation casing pipe and the like are realized in one set of device. The anchoring compensation device anchors the whole branch well screen pipe string in the well bore by using four strong flukes, so that the screen pipe string is prevented from moving from the branch well bore to the main well bore in the future production, and the production pipe column in the main well bore is prevented from being lowered to influence the production of the oil well. The pipe anchoring compensation device enables the sieve tube in the branch well bore to play roles of supporting the well wall and preventing sand, can prolong the service life of the branch well bore and improves the single well yield. The anchoring of the screen pipe string in the branch well bore can be realized, but the tool does not have a packing function, stratum sand cannot be prevented from entering the main well bore from an annular gap between the tool and the stratum, and the structure is complex.

Thus, there is a need to develop an anchoring, packing and release device that can be used with a screen string.

Disclosure of Invention

Aiming at the technical problems, the invention aims to provide an anchoring packing releasing tool which can finish the procedures of anchoring, packing and releasing of a screen pipe string at one time without the need of redundant underground tool cooperation, thereby simplifying the operation flow.

According to the present invention there is provided an anchor pack-off release tool comprising:

the pipe wall of the base pipe is provided with a connecting hole;

A moving assembly disposed outside the base pipe for anchoring and/or packing in response to pressure transmitted from the connection hole;

the central tube is arranged at the inner side of the base tube, and the wall of the central tube is provided with a pressure transmission hole communicated with the connecting hole;

a ball seat disposed in the center tube by a shear pin, and

A locking block arranged on the wall of the central tube in a radial penetrating way, wherein,

In a first state, the first end of the locking block is in radial abutting joint with the ball seat, the second end of the locking block is positioned in the base pipe, thereby locking the base pipe and the central pipe,

In the second state, the ball seat moves relative to the central tube, and radial contact of the locking block is released, so that the locking block is separated from the base tube, and the central tube is separated from the base tube.

In a specific embodiment, a recovery groove is arranged on the outer wall of the ball seat, and in a first state, the recovery groove is located above the locking piece, and in a second state, the recovery groove and the locking piece are located at the same height.

In a specific embodiment, a small diameter portion is provided at the lower end of the center tube, the small diameter portion having an inner diameter smaller than an outer diameter of the ball seat.

In a specific embodiment, in the second state, the lower end of the ball seat is in axial contact with the small diameter portion.

In a specific embodiment, a locking groove for accommodating the locking piece is arranged on the base pipe.

In a specific embodiment, a connection nipple for connecting other downhole tools is provided at the lower end of the base pipe.

In a specific embodiment, the upper end of the connection nipple is configured as the lower end of the locking groove.

In a specific embodiment, the moving assembly comprises a taper sleeve, an anchoring sleeve and a hydraulic cylinder which are sequentially arranged on the outer side of the base pipe along the axial direction, wherein the taper sleeve is fixedly arranged on the base pipe, and the hydraulic cylinder is configured to be capable of axially moving relative to the base pipe in response to the pressure of the connecting hole, so that the anchoring sleeve is pushed to move relative to the taper sleeve, and anchoring is completed.

In a specific embodiment, a packing sleeve is disposed between the hydraulic cylinder and the anchor sleeve.

In a specific embodiment, a dust cover for protecting the moving assembly is fixedly arranged on the outer side of the central tube, and the dust cover is positioned at the upper end of the moving assembly.

Compared with the prior art, the application has the following advantages.

When the invention is specially used for placing the screen pipe into the branch well bore in the secondary branch well, the screen pipe string in the branch well bore can be prevented from subsequent drilling caused by drilling sliding by anchoring, packing and releasing the branch well bore, and stratum sand can be blocked by matching with the screen pipe in the branch well bore, so that a large amount of stratum sand can be prevented from entering the main well bore to cause blockage, and the yield is prevented from being influenced.

The tee of the present invention is used on the one hand to cooperate with a setting ball to provide the pressure required for anchoring and packing the moving assembly. On the other hand, the ball seat butt locking piece makes the locking piece lock center tube and base pipe, and after the ball seat moved down for the center tube, the ball seat just can release the butt to the locking piece to make the locking piece can break away from the base pipe, and then make center tube and base pipe separation, accomplish the giving up. The anchoring, packing and releasing processes can be completed by only adjusting the pressure of the drilling fluid, and the operation is simple.

The anchoring and packing procedures and the releasing procedures are not sequential, and the operation is more flexible.

Drawings

The present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a schematic view of one embodiment of a first state of an anchored packer release tool in accordance with the present invention;

FIG. 2 shows a schematic diagram of one embodiment of a second state of an anchored packer release tool in accordance with the present invention;

figure 3 shows a schematic view of one embodiment of the mobile assembly of an anchored packer release tool according to the present invention completing the anchoring and packing.

In the figure:

1. A base pipe;

2.a moving assembly; 21, a taper sleeve, 22, an anchoring sleeve, 23, a hydraulic cylinder, 24 and a packing cylinder;

3. A connection hole; 4, a central pipe, 5, a pressure transmission hole, 6, a shearing pin, 7, a ball seat, 8, a locking block, 9, a recovery groove, 10, a small diameter part, 11, a locking groove, 12, a connecting nipple, 13, a dust cover, 14, a setting ball and 100, an anchoring packing releasing tool.

In the present application, all of the figures are schematic drawings which are intended to illustrate the principles of the application only and are not to scale.

Detailed Description

The invention is described below with reference to the accompanying drawings.

The directional terms or qualifiers "upper" and "lower" used in the present application are used with respect to fig. 1 to which reference is made. They are not intended to limit the absolute position of the parts involved, but may vary according to the specific circumstances.

Fig. 1 shows the structure of an anchored packer release tool 100 in accordance with the present invention. As shown in fig. 1, the anchored packer release tool 100 comprises a base pipe 1, a traveling assembly 2, a base pipe 4, a ball seat 7, and a locking block 8.

Wherein, the base pipe 1 is constructed in an approximate cylindrical shape, and a connecting hole 3 for communicating the inner cavity and the outer cavity of the base pipe 1 is arranged on the pipe wall of the base pipe.

The mobile assembly 2 is configured to activate in response to the pressure of the drilling fluid to effect anchoring and/or packing. The moving assembly 2 is coaxially sleeved outside the base pipe 1, and the position of the moving assembly 2 for responding to the drilling fluid is communicated with the connecting hole 3, so that the drilling fluid pressure inside the anchoring and packing releasing tool 100 can be transmitted to the moving assembly 2 through the connecting hole 3.

The central tube 4 is constructed in an approximately cylindrical shape. The central tube 4 is coaxially and hermetically sleeved on the inner side of the base tube 1, the length of the central tube 4 is larger than that of the base tube 1, and the upper end part of the central tube 4 exceeds the length range of the base tube 1. The wall of the central tube 4 is provided with a pressure transmission hole 5 for communicating the inner cavity with the outer cavity of the central tube 4, and the pressure transmission hole 5 is communicated with the connecting hole 3 of the base tube 1. Specifically, the central axis of the pressure transmitting hole 5 coincides with the central axis of the connection hole 3.

The ball seat 7 is located below the pressure transmitting hole 5 and is arranged in the central tube 4 by the shear pin 6. A sealing ring (not shown) for sealing is provided between the outer wall of the ball seat 7 and the inner wall of the central tube 4. The ball seat 7 can be matched with the setting ball 14 to form a seal so as to seal the inner cavity of the central tube 4. After the inner cavity of the central tube 4 is blocked by the ball seat 7 and the setting ball 14, drilling fluid pressure in the central tube 4 can be transmitted to the moving assembly 2 through the pressure transmission hole 5 and the connecting hole 3, so that the moving assembly 2 can realize anchoring and blocking.

The locking block 8 is radially penetratingly arranged on the wall of the central tube 4. Specifically, a guide hole for communicating the inner cavity with the outer cavity is formed in the wall of the central tube 4, and the locking block 8 is slidably arranged in the guide hole. In this arrangement, the locking piece 8 can be moved radially on the wall of the central tube 4, so that the radial ends of the central tube 4 can be brought into different positions in different states.

In the first state, the first end of the locking piece 8 is in radial abutment with the ball seat 7, i.e. the radially inner end of the locking piece 8 is in abutment with the outer wall of the ball seat 7. Meanwhile, the second end of the locking piece 8 is located in the base pipe 1, that is, the radially outer end of the locking piece 8 extends into the base pipe 1, so that the locking piece 8 is abutted against the base pipe 1 on the upper side and the lower side of the axial direction of the anchoring and packing releasing tool 100, and the base pipe 1 cannot move axially relative to the central pipe 4, and the base pipe 1 and the central pipe 4 are locked mutually and axially. Thus, in the first state, the upper end of the base pipe 4 is connected to the well tool, and the whole anchoring packer releasing tool 100 can be driven into the well by the well tool.

In the second state, the ball seat 7 moves relative to the base pipe 4, and the radial abutment against the lock piece 8 is released, so that the lock piece 8 is separated from the base pipe 1, and the base pipe 4 is separated from the base pipe 1. Specifically, after the setting ball 14 enters the ball seat 7 to form a seal, the shear pin 6 is sheared by increasing the drilling fluid pressure, so that the ball seat 7 moves downward relative to the center tube 4.

Further, a recovery groove 9 is provided on the outer wall of the ball seat 7, the recovery groove 9 being shaped to receive the lock block 8 such that the lock block 8 is movable radially inwards with respect to the central tube 4. In the first state, the recovery groove 9 is located above the locking piece 8, and in the second state, the ball seat 7 moves downwards until the recovery groove 9 and the locking piece 8 are located at the same height, so that the locking piece 8 can move radially inwards relative to the central tube 4, and the locking piece 8 is separated from the base tube 1, and separation of the central tube 4 and the base tube 1 is achieved.

In a specific embodiment, a locking groove 11 is provided on the inner wall of the base pipe 1, the locking groove 11 is configured to accommodate the locking piece 8, and after the locking piece 8 enters the locking groove 11, both the upper and lower sides of the locking piece 8 are in contact with the base pipe 1, so that the locking piece 8 cannot move axially relative to the base pipe 1, and the central pipe 4 cannot move axially relative to the base pipe 1.

According to the present invention, in a preferred embodiment, a small diameter portion 10 is provided at the lower end of the center tube 4, the small diameter portion 10 having an inner diameter smaller than the outer diameter of the tee 7. In the second state, the lower end of the ball seat 7 is in axial contact with the small diameter portion 10. That is, when the ball seat 7 shears the shear pin 6 under the pressure of the drilling fluid and moves downward with respect to the center tube 4, it abuts against the upper portion of the small diameter portion 10, and the recovery groove 9 in the ball seat 7 is at the same height as the lock piece 8.

With this arrangement, there are several benefits to the small diameter portion 10. On the one hand, the small diameter portion 10 can prevent the ball seat 7 from falling down into the well. The small diameter portion 10 on the other hand can provide a location for the ball seat 7 to align the recovery groove 9 with the lock block 8. On the one hand, the small diameter part 10 prevents the ball seat 7 from being separated from the central tube 4 downwards, so that the ball seat 7 can always play a role in plugging the inner cavity of the central tube 4, and further, the anchoring and packing process and the releasing process do not need a specific sequence.

According to the invention, in a preferred embodiment, a connection nipple 12 for connection to other downhole tools is provided at the lower end of the base pipe 1. The upper end of the connection nipple 12 is configured as the lower end of the locking groove 11. With this arrangement, after the connection nipple 12 is removed from the lower end of the base pipe 1, the lock block 8 can be assembled from below the base pipe 1, thereby facilitating assembly of the anchored packer release tool 100.

In one particular embodiment, the mobile assembly 2 includes a cone sleeve 21, an anchor sleeve 22, and a hydraulic cylinder 23.

The taper sleeve 21, the anchor sleeve 22 and the hydraulic cylinder 23 are sequentially arranged on the outer side of the base pipe 1 from top to bottom along the axial direction. Wherein, the taper sleeve 21 is configured into a ring shape with a certain taper on the outer side, and the taper surface of the taper sleeve 21 faces the anchoring sleeve 22. The anchor sleeve 22 includes a plurality of circumferentially disposed anchor tabs (not shown) which are capable of radially expanding under the taper of the sleeve 21 to abut the inner wall of the wellbore to effect anchoring when the anchor sleeve 22 is moved upwardly relative to the sleeve 21. The hydraulic cylinder 23 is configured to be axially movable relative to the base pipe 1 in response to the pressure of the connection hole 3, thereby pushing the anchor sleeve 22 to move relative to the drogue 21, completing the anchoring. Specifically, after the hydraulic cylinder 23 is sealed and sleeved on the outer side of the base pipe 1, an annulus is formed between the hydraulic cylinder 23 and the base pipe 1, the annulus is communicated with the connecting hole 3, the area of an upper differential pressure working surface of the hydraulic cylinder 23 is larger than that of a nep of a lower differential pressure working surface, and the hydraulic cylinder 23 can move upwards under the differential pressure effect.

In a preferred embodiment, a packing 24 is provided between the hydraulic cylinder 23 and the anchor sleeve 22. The hydraulic cylinder 23 is able to push the packing 24 and the anchor sleeve 22 upwards during the upward movement relative to the base pipe 1. The anchoring sleeve 22 expands radially under the action of the cone sleeve 21 to complete anchoring. The packing sleeve 24 radially expands under axial compression to abut the inner wall of the wellbore, completing the packing.

In a preferred embodiment, a dust cover 13 for protecting the moving assembly 2 is fixedly provided at the outer side of the central tube 4, and the dust cover 13 is positioned at the upper end of the moving assembly 2. Specifically, the lower end of the dust cover 13 is inserted into the inside of the cone sleeve 21, that is, the radially inner and outer sides of the lower end portion of the dust cover 13 are respectively in contact with the center tube 4 and the cone sleeve 21.

In a preferred embodiment, the cone sleeve 21 is fixedly connected to the base pipe 1 by means of a threaded connection.

In a preferred embodiment, the nipple 12 is fixedly connected to the base pipe 1 by means of a threaded connection.

In a preferred embodiment, the packing element 24 is provided as a glue element.

The method of using the anchor pack-off tool 100 according to the present invention is as follows.

First, the anchoring packer releasing tool 100 is assembled as shown in fig. 1, the lower end of the connection nipple 12 is connected to the screen string, and the upper end of the base pipe 4 is connected to the well tool.

After the anchored packer release tool 100 is lowered to the designated position, a setting ball 14 is placed therein until the setting ball 14 enters the tee 7, plugging the inner cavity of the base pipe 4.

The drilling fluid is pumped into the central tube 4 to pressurize, so that the ball seat 7 shears the shear pin 6, the ball seat 7 moves downwards to axially abut against the small-diameter part 10, meanwhile, the recovery groove 9 and the locking piece 8 are positioned at the same height, the locking piece 8 can move radially inwards, the locking of the central tube 4 and the base tube 1 is released, the central tube 4 can be separated from the base tube 1 by lifting the central tube 4, and releasing is realized, as shown in fig. 2.

The pumping pressure of the drilling fluid is increased, the pressure is transmitted to the hydraulic cylinder 23 through the pressure transmission hole 5 and the connecting hole 3, the hydraulic cylinder 23 moves upwards, the anchoring sleeve 22 and the packing cylinder 24 are radially expanded, and the anchoring and the packing between the outer wall of the base pipe 1 and the inner wall of the well bore are completed, as shown in fig. 3.

Finally, the central tube 4 is lifted up, the dustproof sleeve 13, the ball seat 7, the setting ball 14 and the locking piece 8 move out of the well along with the central tube 4, and the base tube 1, the taper sleeve 21, the anchoring sleeve 22, the hydraulic cylinder 23, the packing cylinder 24 and the connecting nipple 12 are left in the well.

The above-described anchoring, packing and releasing processes may be changed in order by adjusting the strength of the shear pin 6 or the magnitude of the response pressure of the hydraulic cylinder 23.

In the description of the present invention, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, mechanically connected, electrically connected, directly connected, indirectly connected via an intervening medium, or in communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Finally, it should be noted that the above description is only of a preferred embodiment of the invention and is not to be construed as limiting the invention in any way. Although the invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the techniques described in the foregoing examples, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. An anchoring and packing release tool, comprising: A base pipe (1), wherein a connecting hole (3) is provided on a pipe wall of the base pipe (1); A moving assembly (2) disposed on the outside of the base pipe (1) and used for anchoring and/or sealing in response to the pressure transmitted by the connecting hole (3); A central tube (4) arranged inside the base tube (1), wherein a pressure transmission hole (5) communicating with the connecting hole (3) is arranged on the tube wall of the central tube (4); a ball seat (7) disposed in the central tube (4) via a shear pin (6); and A locking block (8) is radially penetrated and arranged on the wall of the central tube (4), wherein: In the first state, the first end of the locking block (8) is radially abutted against the ball seat (7), and the second end of the locking block (8) is located inside the base pipe (1), thereby locking the base pipe (1) and the center pipe (4). In the second state, the ball seat (7) moves relative to the central tube (4) to release the radial abutment on the locking block (8), thereby causing the locking block (8) to detach from the base tube (1), thereby separating the central tube (4) from the base tube (1). 2. The anchoring and sealing release tool according to claim 1 is characterized in that a recovery groove (9) is provided on the outer wall of the ball seat (7), and in a first state, the recovery groove (9) is located above the locking block (8), and in a second state, the recovery groove (9) and the locking block (8) are at the same height. 3. The anchoring and isolation releasing tool according to claim 2 is characterized in that a small diameter portion (10) is provided at the lower end of the central tube (4), and the inner diameter of the small diameter portion (10) is smaller than the outer diameter of the ball seat (7). 4. The anchoring and sealing release tool according to claim 3 is characterized in that, in the second state, the lower end of the ball seat (7) is in axial contact with the small diameter portion (10). 5. The anchoring and isolation releasing tool according to any one of claims 1 to 4, characterized in that a locking groove (11) for accommodating the locking block (8) is provided on the base pipe (1). 6. The anchoring and isolation releasing tool according to claim 5 is characterized in that a connecting short section (12) for connecting other downhole tools is provided at the lower end of the base pipe (1). 7. The anchoring and packing release tool according to claim 6, characterized in that the upper end of the connecting short section (12) is configured as the lower end of the locking groove (11). 8. The anchoring and isolation releasing tool according to any one of claims 1 to 7 is characterized in that the moving assembly (2) comprises a cone sleeve (21), an anchor sleeve (22) and a hydraulic cylinder (23) which are sequentially arranged axially on the outside of the base pipe (1), the cone sleeve (21) is fixedly arranged on the base pipe (1), and the hydraulic cylinder (23) is configured to be able to move axially relative to the base pipe (1) in response to the pressure of the connecting hole (3), thereby pushing the anchor sleeve (22) to move relative to the cone sleeve (21) to complete anchoring. 9. The anchoring and sealing release tool according to claim 8, characterized in that a sealing cylinder (24) is provided between the hydraulic cylinder (23) and the anchoring sleeve (22). 10. The anchoring and isolation releasing tool according to any one of claims 1 to 9, characterized in that a dust cover (13) for protecting the moving component (2) is fixedly provided on the outer side of the central pipe (4), and the dust cover (13) is located at the upper end of the moving component (2).