Packer capable of preventing setting deviation

Abstract

The packer is provided with a center pipe and a slip assembly, the center pipe is arranged in the packer, the slip assembly is arranged outside the center pipe, an upper cone is arranged above the slip assembly, a lower cone is arranged below the slip assembly, the slip assembly comprises a slip, and the slip is arranged in the center pipe. The two ends of the slip are respectively provided with a plurality of slip petals, the slip petals at the two ends of the slip are respectively provided with a plurality of slip grooves with opposite opening directions, and setting deviation prevention columns are arranged in the slip grooves. The problem of setting in advance before operation of the packer is solved through structural optimization, and the common problems of unfirm setting and incomplete packing caused by non-uniform expansion of the slips during operation can also be solved, so that the success rate and stability of packing are greatly improved, and the time cost and economic cost of operation are greatly reduced.

Description

TECHNICAL FIELD

[0001] The application relates to a packer capable of preventing setting deviation, and belongs to the technical field of downhole plugging tools. BACKGROUND

[0002] The packer is a downhole plugging tool used to isolate the upper stratum, drilling fluid and testing layer during the testing of a drill pipe. When it is necessary to seal the annular space of a tubing, casing or open hole wall of an oil and gas well, the packer is connected to the downhole pipe string, and is lowered to the designed depth, and then the packer is expanded to seal the tubing casing annular space by hydraulic drive or other means. The stability of setting and the continuity of sealing are necessary conditions for qualified sealing. However, the prerequisite for achieving the above necessary conditions is that the expansion of the slips is sufficient. The main defects of the prior art are that the slips are not designed to be guided, which leads to setting deviation and insufficient anchoring force, and the packer is prone to moving and unsealing, resulting in sealing failure.

[0003] More specifically, the slips of the conventional packer are mainly expanded by the variable diameter of the inclined surface in the axial direction of the upper and lower cones, so that the part of the slip contacting the cone is continuously variable in diameter along with the axial movement, and gradually expands to tightly contact the inner wall of the casing. During the entire expansion process of the slip, only the reverse force from the surface of the cone is applied, that is, to ensure that the slip is stably expanded, the reverse force borne by each petal must be the same size, and the size state of the material of the connection part of each petal of the slip, the external environment and the internal quality must be the same. The above conditions can only be achieved under theoretical conditions, so it is inevitable that the setting is not ideal. CONTENT OF THE UTILITY MODEL

[0004] The application aims to design a packer capable of preventing setting deviation, which fully considers the downhole operation conditions, solves the problem of premature setting of the packer before operation by optimizing the structure, and can also solve the problem of uneven expansion of the slip during operation, which leads to unstable setting and incomplete sealing, thereby greatly improving the success rate and stability of sealing, and greatly reducing the time cost and economic cost of operation.

[0005] The application relates to a packer capable of preventing setting deviation, which is provided with a central pipe and a slip assembly, the central pipe is arranged inside the packer, the slip assembly is arranged outside the central pipe, an upper cone is arranged above the slip assembly, a lower cone is arranged below the slip assembly, the slip assembly comprises a slip, a plurality of slip petals are arranged at both ends of the slip, a plurality of slip grooves with opposite opening directions are arranged at the slip petals at both ends of the slip, and an anti-setting-deviation column is arranged in the slip groove.

[0006] The upper part of the slip assembly is provided with a releasing sleeve, the lower part of the slip assembly is provided with a rubber sleeve assembly, and the lower part of the rubber sleeve assembly is provided with a setting sleeve; a transition ring is further arranged between the lower cone and the rubber sleeve assembly; the upper end of the releasing sleeve is provided with an upper pipe joint, the lower end of the upper pipe joint is provided with a mounting groove, the mounting groove is provided with a releasing seat, and the releasing seat is connected with the central pipe in a matched mode; the releasing sleeve is arranged outside the lower end of the upper pipe joint, a fixing pin is arranged between the releasing sleeve and the upper pipe joint, and the releasing sleeve and the releasing seat are connected through a releasing pin; a limiting connecting cylinder is arranged between the slip assembly and the releasing sleeve, and the limiting seat and the central pipe are connected through a lock block.

[0007] The slip assembly comprises a slip upper cover and a slip lower cover, the slip upper cover and the slip lower cover are arranged on the two sides of the slip respectively, guide grooves are arranged on the slip upper cover and the slip lower cover, and guide pins are arranged in the guide grooves; the anti-setting deviation column is arranged on the upper cone and the lower cone, the slip upper cover and the upper cone and the slip lower cover and the lower cone are connected through setting pins; the lower part of the rubber sleeve assembly is provided with a setting piston, the setting piston is arranged on the central pipe, the lower end of the central pipe is connected with a lower central pipe, the setting sleeve is arranged outside the setting piston and the lower central pipe, and the lower end of the lower central pipe is connected with a lower pipe joint; the outer side of the lower central pipe is provided with a lock ring hook, a lock ring seat is further arranged between the lower central pipe and the setting sleeve, and the lock ring seat and the lock ring hook are locked through a lock ring to realize the fastening connection between the lower central pipe and the setting sleeve. BRIEF DESCRIPTION OF DRAWINGS

[0008] Figure 1 is a schematic view of the packer of the present application.

[0009] Figure 2 is a sectional view of the packer of the present application.

[0010] Figure 3 is a schematic view of the left end part of the packer of the present application.

[0011] Figure 4 is a sectional view of the left end part of the packer of the present application.

[0012] Figure 5 is a schematic view of the middle part of the packer of the present application.

[0013] Figure 6 is a sectional view of the middle part of the packer of the present application.

[0014] Figure 7is a right end part schematic view of the packer of the present application.

[0015] Figure 8 is a right end part sectional view of the packer of the present application.

[0016] Figure 9 is a sectional view of the slip of the present application. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical scheme and advantages of the present application more clear, the embodiments of the present application will be described in detail below with reference to the drawings. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other arbitrarily without conflict. The words indicating the direction in the present application are for the need of description with reference to the drawings and do not constitute any limitation to the protection scope. As shown in the drawings, the upper side of the present application refers to the left side of the drawings, and the lower side refers to the right side of the drawings. Corresponding to the downhole tool, the upper side refers to the side of the downhole tool close to the wellhead, and the lower side refers to the side of the downhole tool away from the wellhead.

[0018] The purpose of the present application is to provide a packer with high setting stability and high success rate. The packer is different from the existing packer in that it comprises a slip upper cover, a slip lower cover and a slip. The design of the packer to prevent setting deviation is to break the theoretical operation environment, change the movement trend of the slip itself by external limitation, and achieve a more ideal setting. As shown in the drawings of the present application, the packer to prevent setting deviation is a single-slip multi-rubber cylinder compression type packer, which is mainly used for separating production intervals, preventing interlayer flow and interference, separating well killing fluid and production fluid, and retaining the role of packer fluid.

[0019] As shown in Figure 1 The packer of the present application comprises an upper pipe joint, a fixing pin, a sealing ring, an unsealing seat, an unsealing sleeve, an unsealing pin, a central pipe, a limiting cylinder, a locking block, a limiting seat, a limiting connecting cylinder, an upper cone, a slip upper cover, a slip, a slip lower cover, a lower cone, a transition ring, a rubber cylinder, a spacer ring, a setting piston, a lower central pipe, a locking ring seat, a locking ring, a locking ring head, a setting sleeve, a lower pipe joint and the like. The packer of the present application fully considers the requirements of the operation on the well, and after setting is completed, the anchoring force is strong, the operation is stable, and the sealing effect is good.

[0020] According to the packer of this application, a slip assembly and a central tube are provided. The central tube is located inside the packer, and the slip assembly is located outside the central tube in the middle region of the packer. The upper part of the slip assembly is connected to the limiting connecting cylinder 11 via an upper cone 12, and the upper part of the limiting connecting cylinder 11 is provided with a release sleeve 5. The upper part of the release sleeve 5 is provided with an upper pipe connector 1, and the lower part of the slip assembly is connected to the rubber sleeve assembly via a lower cone 21. The rubber sleeve assembly is connected to the setting sleeve 28, and the setting sleeve 28 is provided with a setting piston 27. The end of the setting sleeve 28 is connected to a lower pipe connector 33. The lower end of the central tube 7 is provided with a lower central tube 29, and the central tube 7 and the lower central tube 29 can be connected by threads. The lower central tube 29 is located inside the setting sleeve 28.

[0021] like Figures 1-8 As shown, the lower inner side of the upper pipe connector 1 is provided with an installation groove. The unsealing seat 4 is inserted into the installation groove and connected to the lower end of the upper pipe connector 1. The unsealing seat 4 is connected to the central tube 7 and fastened with screws. The lower outer side of the upper pipe connector 1 is threaded with an unsealing sleeve 5. A fixing pin 2 is also provided between the unsealing sleeve 5 and the upper pipe connector 1. The unsealing sleeve 5 and the unsealing seat 4 are connected by an unsealing pin 6. A limiting cylinder 8 can be provided between the unsealing sleeve 5 and the limiting connecting cylinder 11. Part of the limiting cylinder 8 is located outside the central tube 7, and part of the limiting cylinder 8 is exposed between the unsealing sleeve 5 and the limiting connecting cylinder 11. Sealing rings 3 can be provided on the outer side of the upper pipe connector 1, the outer side of the unsealing seat 4, the outer side of the central tube 7, and the outer side of the limiting cylinder 8 to seal the packer. The interior of the limiting connecting cylinder 11 may also be provided with a locking block 9 and a limiting seat 10, wherein the limiting seat 10 and the central tube 7 are connected by the locking block 9, and the limiting seat 10 is threadedly connected to the end of the upper cone 12.

[0022] The slip assembly comprises a slip 16, a slip upper cover 14 and a slip lower cover 19, wherein the slip upper cover 14 and the slip lower cover 19 are arranged on the upper and lower sides of the slip 16 respectively. The slip upper cover 14 is threadedly connected with the slip hanging end cover 13, and the slip upper cover 14 and the upper cone 12 are connected through the setting pin 15. The slip upper cover 14 is provided with a guide slot, and a guide pin 18 is arranged in the guide slot. The guide slot can guide the movement of the guide pin 18 in the guide slot. The slip 16 is provided with a plurality of slip petals at two ends respectively. The slip petals at the two ends of the slip 16 are respectively provided with a plurality of slip grooves with opposite opening directions, that is, the left slip groove on the upper side of the slip 16 opens towards the direction of the upper cone 12, and the right slip groove on the lower side of the slip 16 opens towards the direction of the lower cone 21. A setting deviation prevention column 17 is arranged in the slip groove. The setting deviation prevention column 17 can be, for example, a guide pin, which is used to realize the fixed position sliding of the slip to achieve uniform opening, ensure uniform setting stress, and provide a better operation basis for subsequent downhole fracturing construction. Similarly, the slip lower cover 19 is also provided with a guide slot, and a guide pin 18 is arranged in the guide slot. The guide slot can guide the movement of the guide pin 18 in the guide slot. The slip lower cover 19 and the lower cone 21 are connected through the setting pin 20. The lower side of the lower cone 21 is connected with a transition ring 22, and the lower side of the transition ring 22 is sequentially connected with a rubber sleeve assembly. The rubber sleeve assembly of the present application can comprise three rubber sleeves arranged in sequence, namely a first rubber sleeve 23, a second rubber sleeve 24 and a third rubber sleeve 26. The three rubber sleeves can be respectively provided with a spacer ring 25 therebetween.

[0023] A setting piston 27 is arranged below the third rubber sleeve 26 which is the lowermost rubber sleeve. The setting piston 27 is installed on the central pipe 7. The lower end of the setting piston 27 is connected with a lower central pipe 29. The outer sides of the setting piston 27 and the lower central pipe 29 are provided with a setting sleeve 28. The distal end of the lower central pipe 29 is connected with a lower pipe joint 33. A part of the lower pipe joint 33 is inserted into the setting sleeve 28. The outer side of the lower central pipe 29 is provided with a lock ring hook 31. The lower central pipe 29 and the setting sleeve 28 are further provided with a lock ring seat 30. The lock ring seat 30 and the lock ring hook 31 are locked through a lock ring 32, so as to realize the fastening connection between the lower central pipe 29 and the setting sleeve 28.

[0024] According to the packer for preventing setting deviation of the present application, the assembly process is as follows:

[0025] (1) The upper pipe joint 1 is connected with the unsetting seat 4, the central pipe 7 is connected to the lower end of the unsetting seat 4, and the connection is fastened through screws;

[0026] (2) The unsetting sleeve 5 is installed, which is threadedly connected with the upper pipe joint 1 and is fixed through the fixing pin 2. The unsetting sleeve 5 and the unsetting seat 4 are connected through the unsetting pin 6;

[0027] (3) Continue to install the limiting cylinder 8 outside the central tube 7, and the limiting cylinder 8 is threadedly connected with the end of the unsealing sleeve 5;

[0028] (4) Then install the lock block 9, the limiting seat 10 and the limiting connecting cylinder 11 in sequence;

[0029] (5) After the upper slip end cover 13 is matched with the upper cone 12, the upper slip end cover 13 is installed on the central tube 7;

[0030] (6) The slip upper cover 14 is connected with the slip end cover 13 through threads, and the setting sleeve pin 15 is not installed first, which will cause that subsequent accessories cannot be installed;

[0031] (7) The anti-setting deviation column 17 located on the upper cone 12 is installed, which is used for preventing setting, and after the setting is completed, the setting sleeve pin 15 is used for fixing the slip upper cover 14 and the upper cone 12, and finally the guide pin 18 is installed;

[0032] (8) The slip 16 is installed, and the slip groove of the slip 16 is correspondingly arranged with the anti-setting deviation column 17;

[0033] (9) The slip lower cover 19, the setting sleeve pin 20 and the lower cone 21 are installed in the same way as the eighth step;

[0034] (10) The transition ring 22, the first rubber cylinder 23, the spacer ring 25, the second rubber cylinder 24, the spacer ring 25, the third rubber cylinder 26 and the setting piston 27 are sequentially installed on the central tube 7;

[0035] (11) The lock ring 32 is connected with the lock ring hanging 31, and then connected with the lock ring seat 30, and finally installed on the central tube 29;

[0036] (12) Finally, the lower central tube 29 is installed at the end of the central tube 7, the setting sleeve 28 is connected outside the lower central tube 29, and finally the lower tube joint 33 is connected to the end of the setting sleeve 28, and is fastened by the pin.

[0037] When setting is needed, the upper part of the packer is connected with the oil pipe, and the hydraulic pressure is applied through the oil in the oil pipe, and the hydraulic pressure acts on the setting piston 27 through the central tube pressure guide hole. When the pressure reaches a certain degree, the setting sleeve pin 20 located at the lower cone 21 and the slip lower cover 19 is cut off, and the setting force is transmitted to the slip upper cover 14 through the slip 16, and the setting sleeve pin 15 located at the upper cone 12 is cut off. The oil pressure continues to increase, the slip valve of the slip 16 expands along the anti-setting deviation column 17, the first rubber cylinder 23, the second rubber cylinder 24 and the third rubber cylinder 26 also continuously expand, and finally tightly adhere to the inner wall of the sleeve, seal the annular space of the oil sleeve, and the setting is completed.

[0038] When it is necessary to be unblocked, the upper joint is lifted, when the unblocking pin 6 is cut off, with the unblocking seat 4, the unblocking sleeve 5 and the like being pulled out, the upper cone 12 loses the unilateral fixation, and the contraction force generated when the rubber cylinder rebounds pushes the upper and lower cones and the like to move. When the rubber cylinder rebounds, the sealing effect also disappears.

[0039] The packer according to the present application is also provided with a structure for preventing premature setting, which can effectively prevent the packer from triggering setting under non-working conditions such as manufacturing, transportation, handling, operation installation and the like. Once the packer sets under non-required time, it will lead to the packer being scrapped, which represents a failure of the operation in the well, and will result in a high operation cost. The above-mentioned structure for preventing premature setting includes a setting pin 15, a structure design of upper slips cover 14 and lower slips cover 19 on both sides of slips 16, and the middle part is the slips 16. When the middle part is accidentally stressed to trigger the setting action, the setting pin 15 connects the cone and the upper and lower slips cover, and cannot move under the condition of not being cut off; when the external accidental stress triggers the setting action, it is similar to the above case and will not trigger the setting. The external accidental stress triggering the setting is different, that is, even if the setting pin is accidentally cut off, since the upper slips cover 14, the lower slips cover 19 and the end surface of the slips 16 are overlapped, they will be pushed together when stressed and cannot move. In summary, the packer design can be triggered to set only when the oil pressure reaches a certain degree through normal operation mode.

[0040] The biggest difference between the slips of the packer according to the present application and the conventional slips is that the anti-setting deviation column 17 is added, which is located on the upper cone and the lower cone in the three-dimensional assembly relationship, between the slip grooves of each petal of the packer slips. The principle of the anti-setting deviation column 17 preventing setting deviation lies in the guiding effect in the movement of the cone. When the lower cone 21 moves, the anti-setting deviation column 17 above it also moves relatively. Since the height of the anti-setting deviation column 17 is higher than the inclined surface where the cone contacts the slips 16, the anti-setting deviation column 17 is always located between the petals of the slips 16 and cannot be pulled out or rotated. During the movement of the cone pushing the slips 16, due to the unevenness of the force on the petals of the slips, possible problems include: the petals of the slips are not separated or rotated, and when they are attached to the inner wall of the casing, they present uneven petals of different sizes, leading to setting failure. Since the anti-setting deviation column 17 exists, when the petals of the slips are not separated, the anti-setting deviation column 17 can impact the connection between the petals of the slips and cut off the connection between the petals; when the petals of the slips rotate, since the upper and lower ends of the slips 16 are both provided with the anti-setting deviation column 17, whether the petals of the slips rotate clockwise or counterclockwise, they will always be blocked by the anti-setting deviation column 17, so that they cannot rotate.

[0041] Although the present application has been described with reference to the above embodiments, the contents described above are only the embodiments adopted for facilitating the understanding of the present application, and are not intended to limit the present application. Any modification and change in the form and details of the embodiments can be made by any person skilled in the art without departing from the spirit and scope of the present application, and the patent protection scope of the present application shall be subject to the scope defined by the claims.

Claims

1. A packer for preventing setting off-center, characterized by, The center tube is arranged inside the packer, and the slip assembly is arranged outside the center tube, the upper cone is arranged above the slip assembly, the lower cone is arranged below the slip assembly, the slip assembly comprises slips, and a plurality of slip petals are arranged at two ends of each slip respectively, a plurality of slip grooves with opposite opening directions are arranged at the slip petals of the two ends of each slip respectively, and a seat-off-preventing deviation column is arranged in each slip groove.

2. The packer of claim 1, wherein, An unseating sleeve is arranged above the slip assembly, a rubber sleeve assembly is arranged below the slip assembly, and a setting sleeve is arranged below the rubber sleeve assembly.

3. The packer of claim 2, wherein, A transition ring is further arranged between the lower cone and the rubber sleeve assembly.

4. The packer of claim 3, wherein, An upper tool joint is arranged above the unseating sleeve, a mounting groove is arranged at the lower end of the upper tool joint, an unseating seat is arranged in the mounting groove, and the unseating seat is connected with the center tube in a matched mode.

5. The packer of claim 4, wherein, The unseating sleeve is arranged outside the lower end of the upper tool joint, a fixing pin is arranged between the unseating sleeve and the upper tool joint, and the unseating sleeve is connected with the unseating seat through an unseating pin.

6. The packer of claim 5, wherein, A limiting connection cylinder is arranged between the slip assembly and the unseating sleeve, a locking block and a limiting seat are further arranged inside the limiting connection cylinder, the limiting seat is connected with the center tube through the locking block, and the limiting seat is connected with the end of the upper cone.

7. The packer of any one of claims 1-6, wherein, The slip assembly comprises a slip upper cover and a slip lower cover, the slip upper cover and the slip lower cover are arranged at two sides of the slip respectively, guide grooves are arranged on the slip upper cover and the slip lower cover, and guide pins are arranged in the guide grooves.

8. The packer of claim 7, wherein, The seat-off-preventing deviation column is arranged on the upper cone and the lower cone, the slip upper cover and the upper cone are connected through a setting pin, and the slip lower cover and the lower cone are connected through a setting pin.

9. The packer of any one of claims 2-6, wherein, A setting piston is arranged below the rubber sleeve assembly, the setting piston is arranged on the center tube, a lower center tube is connected with the lower end of the center tube, the setting sleeve is arranged outside the setting piston and the lower center tube, and a lower tool joint is connected with the tail end of the lower center tube.

10. The packer of claim 9, wherein, A locking ring hook is arranged outside the lower center tube, a locking ring seat is further arranged between the lower center tube and the setting sleeve, the locking ring seat and the locking ring hook are locked through a locking ring, so that the lower center tube and the setting sleeve are connected in a fastening mode.

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