Cage type slip packer capable of being cut and recycled

Abstract

The utility model relates to a cage type slip packer capable of being cut and recycled. The cage type slip packer is used for well completion operation, layered oil production and the like. According to the device, the upper portion of an upper center pipe is sleeved with a rubber barrel, the lower portion of the rubber barrel is sleeved with a slip anchoring mechanism and a hydraulic cylinder mechanism, and the slip anchoring mechanism comprises an upper cone, a lower cone and a cage type slip; the hydraulic cylinder mechanism comprises a cylinder sleeve, a lower cone, an upper central pipe and a cutting pipe; the upper end of the lower center pipe is connected with the cutting pipe, the setting locking mechanism is sleeved outside the lower center pipe, and the protective ring is coaxially connected outside the lower center pipe in a threaded mode. An upper locking ring is arranged between the upper central pipe and the upper cone; a torque transmission mechanism is arranged on the lower portion of the lower cone, key grooves are formed in the cage type slips and the lower cone, and keys are arranged in the key grooves. According to the packer, the problem that unsealing is accidentally achieved due to pressure does not exist, unsealing is achieved by cutting the central pipe, and the cutting unsealing mode is more reliable for an ultra-deep well.

Description

Technical Field

[0001] The utility model belongs to the technical field of well completion packers for oilfield development, in particular to a cage-type slip packer that can be cut and recovered, which is used for well completion operations and stratified oil production. Background Art

[0002] Currently, most high-pressure and ultra-high-pressure oil well completions utilize high-temperature, high-pressure packers. These packers feature a central rubber cartridge, with upper and lower slip anchoring mechanisms located above and below the cartridge. While these packers offer a strong pressure-bearing capacity, releasable packers can sometimes be difficult to unseal. To improve their pressure-bearing capacity, hydraulic anchors are often installed above the packer, increasing costs and the risk of unsealable stuck tubing. Utility Model Content

[0003] In order to solve the above technical problems, the utility model provides a cage-type slip packer that can be cut and recovered, which solves the problem of sometimes difficult unsealing in the current technology and also solves the problem of accidental unsealing of the packer due to pressure difference.

[0004] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0005] A cage-type slip packer that can be cut and recovered, a rubber cylinder is set on the upper part of the upper central tube, and a slip anchoring mechanism and a hydraulic cylinder mechanism are sequentially set below the rubber cylinder. The slip anchoring mechanism includes an upper cone, a lower cone and a cage-type slip set on the outer side of the upper central tube, and the cage-type slip is set on the upper cone and the lower cone; the hydraulic cylinder mechanism includes a cylinder sleeve, a lower cone, an upper central tube and a cutting tube, the upper end of the cutting tube is threadedly connected to the lower end of the upper central tube, the upper end of the cylinder sleeve is threadedly connected to the lower cone and is sealed, the cylinder sleeve and the cutting tube, the lower cone and the upper central tube are slidingly sealed, and the lower cone and the upper central tube are slidingly sealed. A pressure transmission hole is provided on the side wall of the upper center tube between the cutting tubes; the upper end of the lower center tube is connected to the cutting tube, and a seating and locking mechanism is sleeved on the outer sleeve of the lower center tube. The seating and locking mechanism includes a locking ring sleeve, a lower locking ring, a shear nail sleeve and a shear nail. The upper end of the locking ring sleeve is connected to the cylinder sleeve, and the lower end is connected to the shear nail sleeve. A lower locking ring cavity is provided between the locking ring sleeve and the lower center tube, and the lower locking ring is placed in the lower locking ring cavity. A locking thread is provided on the outer wall of the lower center tube, and shear nail holes are relatively provided between the shear nail sleeve and the lower center tube, and the shear nails are placed in the shear nail holes; a guard ring is coaxially threadedly connected to the outer side of the lower center tube below the shear nail sleeve.

[0006] Furthermore, an upper locking ring cavity is provided between the upper central tube and the upper cone, the upper locking ring is placed in the upper locking ring cavity, and an unsealing thread is provided on the outer periphery of the central tube below the upper locking ring.

[0007] Furthermore, a torque transmission mechanism is provided at the lower part of the lower cone, and the torque transmission mechanism includes a torque transmission ring, a torque transmission pin and a steel ball; an annulus of the torque transmission mechanism is provided between the lower cone and the upper center tube, and the torque transmission ring is placed in the annulus of the torque transmission mechanism; a pin hole is provided axially relative to the torque transmission ring and the lower cone, and the torque transmission pin is placed in the pin hole; a steel ball groove is provided on the inner wall of the torque transmission ring, and the steel ball is placed in the steel ball groove, and the steel ball groove is in a curved wedge shape, the size of its small end is smaller than the diameter of the steel ball, and the locking surface (94) opposite to the outer wall of the center tube is an arc surface or a plane; a stop cap is provided on the outer side of the upper center tube below the torque transmission mechanism and is connected to the lower cone; a key groove is provided on the cage slip and the lower cone, and the key is placed in the key groove.

[0008] Furthermore, the length of the cuttable section of the cutting pipe is greater than 0.3 m. Still further, the length of the cuttable section of the cutting pipe is 0.4-0.7 m.

[0009] Compared with the prior art, the advantages of the present invention are:

[0010] 1. The packer of this utility model does not require shear pins or shear rings to release the seal. When the packer is under downward pressure, there is no problem of accidental release due to pressure. Therefore, high pressure differential wells no longer need to be equipped with hydraulic anchors, and the risk of hydraulic anchors getting stuck in the pipe string during release is also avoided.

[0011] 2. The slip anchoring mechanism of the packer is placed below the rubber cylinder, making it easier to unseal.

[0012] 3. The packer is released by cutting the central pipe. For ultra-deep wells, this release method is more reliable.

[0013] The technical solution of the present utility model is further described below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] When considered in conjunction with the accompanying drawings, the present invention can be more completely understood and many of the accompanying advantages can be easily known by referring to the detailed description below, but the drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The schematic embodiments of the present invention and their description are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0015] Figure 1 The utility model is a structural schematic diagram of a cage-type slip packer that can be cut and recovered.

[0016] Figure 2 yes Figure 1 Cross-section at AA in the middle.

[0017] Figure 3 yes Figure 1 Enlarged view of point B in the middle.

[0018] Figure 4 yes Figure 2 Cross-section at CC (partial).

[0019] In the figure: 1-upper center tube, 2-rubber cylinder, 3-upper locking ring, 4-upper cone, 5-unsealing thread, 6-cage slip, 7-key, 8-lower cone, 9-torque transmission mechanism, 10-stop cap, 11-cylinder sleeve, 12-cutting tube, 13-lower center tube, 14-locking thread, 15-locking sleeve, 16-lower locking ring, 17-shear pin sleeve, 18-shear pin, 19-guard ring, 20-pressure transmission hole, 21-lower step surface, 22-upper step surface, 91-torque transmission ring, 92-torque transmission pin, 93-steel ball, 94-locking surface. DETAILED DESCRIPTION

[0020] In this specification and claims, the terms "upper" and "lower" refer to the positional relationship when the tool is in use, with the female threaded end being upper and the male threaded end being lower. This description will not be repeated here. The packer of this utility model is a hydraulic packer and incorporates numerous sealing structures. The locations requiring sealing are shown in the accompanying drawings and will not be detailed here.

[0021] Example 1

[0022] See also Figure 1 As shown, the utility model is a cage-type slip packer that can be cut and recovered. The upper part of the upper center pipe 1 is covered with a rubber cylinder 2, and the slip anchoring mechanism and the hydraulic cylinder mechanism are sequentially covered below the rubber cylinder. The slip anchoring mechanism includes an upper cone 4, a lower cone 8 and a cage slip 6 covered outside the upper center pipe, and the cage slip is covered on the upper cone and the lower cone; the hydraulic cylinder mechanism includes a cylinder sleeve 11, a lower cone, an upper center pipe and a cutting pipe 12. The upper end of the cutting pipe is threadedly connected to the lower end of the upper center pipe, the upper end of the cylinder sleeve is threadedly connected to the lower cone and is sealed, the cylinder sleeve and the cutting pipe, the lower cone and the upper center pipe are slidingly sealed, and the lower cone is in the lower cone. A pressure transmission hole 20 is provided on the side wall of the upper center tube between the upper center tube and the cutting tube; the upper end of the lower center tube 13 is connected to the cutting tube, and a seating and locking mechanism is sleeved on the outer sleeve of the lower center tube, the seating and locking mechanism includes a locking ring sleeve 15, a lower locking ring 16, a shear nail sleeve 17 and a shear nail 18, the upper end of the locking ring sleeve is connected to the cylinder sleeve, and the lower end is connected to the shear nail sleeve, a lower locking ring cavity is provided between the locking ring sleeve and the lower center tube, the lower locking ring is placed in the lower locking ring cavity, a locking thread 14 is provided on the outer wall of the lower center tube, and shear nail holes are relatively arranged between the shear nail sleeve and the lower center tube, and the shear nails are placed in the shear nail holes; a guard ring 19 is coaxially threadedly connected to the outer side of the lower center tube below the shear nail sleeve.

[0023] Figure 1 The upper center tube of the present invention is a combination of the upper female threaded joint and the center tube. During implementation, the female threaded joint and the center tube can of course be divided into two parts.

[0024] The locking thread is a sawtooth thread, and its structure is a known technology.

[0025] The cage slip is a cylindrical body with serrated teeth on its upper and lower exteriors. Its inner wall is provided with multiple conical surfaces, three of which are shown in the figure. These three conical surfaces mate with the conical surfaces on the upper and lower cones, respectively. As shown in the figure, the cage slip's cylindrical wall is cut in an axially staggered pattern, forming a uniformly connected "J" shape.

[0026] Example 2

[0027] Example 2 is an improvement on Example 1, aimed at improving the reliability of the unsealing process. It differs from Example 1 in that an unsealing mechanism is added between the upper cone and the upper central pipe; otherwise, the structure remains the same. The unsealing mechanism functions as follows: when the tubing string is lifted, the upward movement of the unsealing thread drives the upper locking ring and upper cone upward, disengaging the upper cone from the cage slips.

[0028] The improvements are: Figure 1 As shown, an upper locking ring cavity is provided between the upper central tube and the upper cone, an upper locking ring 3 is placed in the upper locking ring cavity, and an unsealing thread 5 is provided on the outer periphery of the central tube below the upper locking ring.

[0029] There are locking threads inside and outside the upper locking ring, and internal locking threads are also correspondingly arranged on the inner wall of the upper locking ring cavity, and the locking threads are all serrated threads.

[0030] Example 3

[0031] Example 3 is an improvement on Example 1, also intended to improve unblocking reliability. It differs from Example 1 in that a torque transmission mechanism is provided at the lower portion of the lower cone; otherwise, the structure remains the same. The torque transmission mechanism functions to assist in unblocking by rotating the tubing string and transmitting torque to the cage slips.

[0032] The improvements are: Figure 1-4 As shown, a torque transmission mechanism 9 is provided at the lower part of the lower cone, and the torque transmission mechanism includes a torque transmission ring 91, a torque transmission pin 92 and a steel ball 93; a torque transmission mechanism annulus is provided between the lower cone and the upper center tube, and the torque transmission ring is placed in the torque transmission mechanism annulus; a pin hole is provided axially relative to the torque transmission ring and the lower cone, and the torque transmission pin is placed in the pin hole; a steel ball groove is provided on the inner wall of the torque transmission ring, and the steel ball is placed in the steel ball groove, and the steel ball groove is in a curved wedge shape, and the size of its small end is smaller than the diameter of the steel ball, and the locking surface 94 opposite to the outer wall of the center tube is an arc surface or a plane; a stop cap 10 is provided on the outer side of the upper center tube below the torque transmission mechanism and is connected to the lower cone; key slots are provided on the cage slips and the lower cone, and the key 7 is placed in the key slot.

[0033] The number of the torque transmission pin 92, the steel ball 93 and the steel ball groove is set according to the structural size, and can be more than one. Figure 2 Shown are 6 evenly distributed ones.

[0034] When the upper center tube rotates, the steel ball moves toward the small end of the steel ball groove and clamps by relying on friction self-locking, thereby driving the torque transmission ring and the lower cone to rotate together.

[0035] Example 4

[0036] Example 4 is an improvement to Example 1, and its purpose is also to improve the reliability of unsealing. The difference from Example 1 is that it further limits the length of the cutting tube 12, and the other structures are the same.

[0037] Improvements are: See Figure 1 As shown, the length of the cuttable section of the cutting pipe is more than 0.3 m. In order to save processing costs and meet the needs of on-site operations, 0.4-0.7 m is the best.

[0038] The cutting tube is a stepped tube body, which is larger at the top and smaller at the bottom, and has a lower stepped surface 21. The length of the cutting section refers to the distance between the lower stepped surface 21 of the cutting tube and the upper stepped surface 22 of the lower center tube.

[0039] In order to ensure that the movement of each component is not restricted when the packer is set, a breathing hole is provided on the side wall of the cylinder sleeve 11 in the cutting section, such as Figure 1 As shown in .

[0040] When the packer needs to be unsealed, a cutting tool is lowered into the tubing, the cutting pipe at the cutting section is cut, and the packer is lifted to unseal it.

[0041] Obviously, many modifications and changes made by those skilled in the art based on the purpose of the present invention fall within the protection scope of the present invention.

Claims

1. A cage-type slip packer that can be cut and recovered, wherein a rubber sleeve (2) is mounted on the upper portion of an upper central pipe (1), and a slip anchoring mechanism and a hydraulic cylinder mechanism are mounted in sequence below the rubber sleeve, characterized in that: The slip anchoring mechanism comprises an upper cone (4), a lower cone (8) and a cage slip (6) which are sleeved on the outer side of the upper center tube, and the cage slip is sleeved on the upper cone and the lower cone; the hydraulic cylinder mechanism comprises a cylinder sleeve (11), a lower cone, an upper center tube and a cutting tube (12), the upper end of the cutting tube is threadedly connected to the lower end of the upper center tube, the upper end of the cylinder sleeve is threadedly connected to the lower cone and sealed, a sliding seal is formed between the cylinder sleeve and the cutting tube, and between the lower cone and the upper center tube, and a pressure transmission hole (20) is provided on the side wall of the upper center tube between the lower cone and the cutting tube; the upper end of the lower center tube (13) is threadedly connected to the lower end of the cutting tube, and the upper end of the cylinder sleeve is threadedly connected to the lower cone and sealed. The utility model is connected to the cutting tube, and a seating and locking mechanism is sleeved on the outer sleeve of the lower center tube, wherein the seating and locking mechanism comprises a locking ring sleeve (15), a lower locking ring (16), a shearing nail sleeve (17) and a shearing nail (18). The upper end of the locking ring sleeve is connected to the cylinder sleeve, and the lower end is connected to the shearing nail sleeve. A lower locking ring cavity is provided between the locking ring sleeve and the lower center tube, and the lower locking ring is placed in the lower locking ring cavity. A locking thread (14) is provided on the outer wall of the lower center tube, and a shearing nail hole is relatively provided between the shearing nail sleeve and the lower center tube, and the shearing nail is placed in the shearing nail hole; a protective ring (19) is coaxially threadedly connected to the outer side of the lower center tube below the shearing nail sleeve.

2. The cuttable and recyclable cage-type slip packer according to claim 1, characterized in that: An upper locking ring cavity is provided between the upper central tube and the upper cone, an upper locking ring (3) is placed in the upper locking ring cavity, and an unsealing thread (5) is provided on the outer periphery of the central tube below the upper locking ring.

3. The cuttable and recyclable cage-type slip packer according to claim 1, characterized in that: A torque transmission mechanism (9) is provided at the lower part of the lower cone, and the torque transmission mechanism includes a torque transmission ring (91), a torque transmission pin (92) and a steel ball (93); a torque transmission mechanism annulus is provided between the lower cone and the upper center tube, and the torque transmission ring is placed in the torque transmission mechanism annulus; a pin hole is provided axially relative to the torque transmission ring and the lower cone, and the torque transmission pin is placed in the pin hole; a steel ball groove is provided on the inner wall of the torque transmission ring, and the steel ball is placed in the steel ball groove, and the steel ball is placed in the steel ball groove, and the steel ball groove is in a curved wedge shape, the size of its small end is smaller than the diameter of the steel ball, and the locking surface (94) opposite to the outer wall of the center tube is an arc surface or a plane; a stop cap (10) is sleeved on the outer side of the upper center tube below the torque transmission mechanism and is connected to the lower cone; key slots are provided on the cage slips and the lower cone, and the key (7) is placed in the key slots.

4. The cuttable and recyclable cage-type slip packer according to claim 1, characterized in that: The length of the cuttable section of the cutting pipe is more than 0.3 m.

5. The cuttable and recyclable cage-type slip packer according to claim 4, characterized in that: The length of the cuttable section of the cutting pipe is 0.4-0.7m.

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