A pressurized sliding packer for oil wells

Abstract

This invention discloses a pressurized sliding packer tool for oil wells, comprising a tool body, and an inner elastic sleeve and an inner liner sequentially sleeved outside the tool body; multiple wear-resistant plates are arranged circumferentially on the outer side of the inner elastic sleeve, and the wear-resistant plates are fixed to the inner elastic sleeve by vulcanized rubber components; one end of the inner liner is inserted into the inner elastic sleeve, and an outer pressure sleeve is sleeved outside the inner liner, with a locking sleeve between the outer pressure sleeve and the inner liner. This invention is used for well workover operations in oil and gas fields, effectively sealing the annulus between the casing and oil well, establishing a circulation channel, improving sand flushing efficiency, and reducing operating costs; the tool has high wear resistance and can meet the requirements of pressurized sliding operations.

Description

Technical Field

[0001] This invention belongs to the field of oilfield development and production technology, and specifically relates to a pressurized sliding packer for oil wells. Background Technology

[0002] With the development of the offshore oil industry, operational efficiency, cost, and safety are becoming increasingly critical. During well completion and workover operations, sand flushing is a fundamental step that is crucial for ensuring the smooth progress of subsequent procedures. Adopting appropriate sand flushing technologies and tools can not only improve operational quality and prevent complex situations or even downhole accidents in later operations, but also increase the overall efficiency of the well completion and workover phase, shorten the operation cycle, and reduce operating costs.

[0003] Currently, self-sealing packers with rubber cups are commonly used in sand flushing operations. The outer diameter of the packer cup is larger than the inner diameter of the casing, and the seal is achieved through an interference fit between the packer cup and the casing. Because the outer diameter of the packer cup is larger than the inner diameter of the casing, the outer edge of the packer cup will slide down tightly against the inner wall of the casing during the running-in process. If the well wall is damaged or burrs are present, the packer cup can easily be damaged, resulting in a poor seal and affecting the operational efficiency. Furthermore, because the packer cup is always in an open state, it increases the friction of the tubing string during the running-in and running-out process. If problems such as sand-laden fluid falling back occur, there is a risk of sand getting stuck in the tubing string. Summary of the Invention

[0004] This invention is proposed to overcome the shortcomings of the prior art, and its purpose is to provide a pressurized sliding packer for oil wells.

[0005] This invention is achieved through the following technical solution:

[0006] A pressurized sliding packer for oil wells includes a tool body and an inner elastic sleeve and an inner liner sleeve sequentially sleeved on the outside of the tool body; multiple wear-resistant plates are arranged around the circumference of the outer side of the inner elastic sleeve, and the wear-resistant plates are fixed to the inner elastic sleeve by vulcanizing rubber parts; one end of the inner liner sleeve is inserted into the inner elastic sleeve, an outer pressure sleeve is sleeved on the outside of the inner liner sleeve, and a locking sleeve is provided between the outer pressure sleeve and the inner liner sleeve.

[0007] In the above technical solution, the inner elastic sleeve includes a connecting collar and a plurality of spring pieces connected to the connecting collar. The spring pieces are evenly distributed at intervals along the circumference of the connecting collar. The connecting collar is a stepped sleeve structure, with its small-diameter end inner wall threaded to the tool body and its large-diameter end gapped to the outer wall of the tool body. One end of the spring piece is connected to the large-diameter end face of the connecting collar, and the other end is tightly attached to the end face of the locking sleeve.

[0008] In the above technical solution, a sealing ring is provided between the inner wall of the small diameter end of the connecting collar and the tool body, and the sealing ring is located on the outer side of the connecting thread between the small diameter end of the connecting collar and the tool body.

[0009] In the above technical solution, the inner liner is a sleeve-type structure with a convex ring formed on the inner wall of one end. The convex ring is threadedly connected to the outer wall of the tool body, and the outer wall of the inner liner is tightly fitted with the inner walls of the inner elastic sleeve and the locking sleeve.

[0010] In the above technical solution, one end of the outer pressure sleeve is fitted outside the inner elastic sleeve, and the inner wall of the other end forms a convex ring. The convex ring is threaded to the outer wall of the tool body, and the bottom surface of the convex ring end of the outer pressure sleeve is a conical bottom.

[0011] In the above technical solution, the locking sleeve is a sleeve-type structure, with a convex ring formed on the inner wall of one end, and the convex ring is placed between the inner bushing and the outer pressure sleeve convex ring.

[0012] In the above technical solution, the wear-resistant sheet is an arc-shaped plate structure with a protrusion formed on its inner sidewall. The protrusion is located in the gap between two adjacent spring sheets, and the cross-section of the protrusion is convex.

[0013] In the above technical solution, the outer arc of the wear-resistant sheet is the same as the arc of the inner diameter of the sleeve used. In the natural state after vulcanization, the outer diameter of the tool body 1 is slightly larger than the inner diameter of the sleeve used.

[0014] In the above technical solution, the cross-section of the vulcanized rubber part is convex, with the steps on both sides vulcanized and fixed to the wear-resistant sheet, and the inner side vulcanized and fixed to the inner elastic sleeve. The arc of the part of the vulcanized rubber part that extends out of the gap between two adjacent elastic sheets is consistent with the arc of the inner diameter of the sleeve. In its natural state after vulcanization, the outer diameter is slightly smaller than the outer diameter of the wear-resistant sheet, and it is in a retracted state.

[0015] In the above technical solution, a retaining ring is sleeved on the outside of the tool body, and the retaining ring is set tightly against the end face of the locking sleeve.

[0016] The beneficial effects of this invention are:

[0017] This invention provides a pressurized sliding packer for oil wells, mainly used in oil and gas field workover operations. During well completion or workover operations in oil fields, when performing operations such as pipe scraping and sand flushing, the tool can effectively seal the annulus between the casing and the oil well, establish a circulation channel, improve the efficiency of sand flushing and well washing, and reduce operating costs. Compared with the prior art, this invention can seal the annulus between the casing and the oil well, and has high wear resistance, which can meet the requirements of pressurized sliding operations. Attached Figure Description

[0018] Figure 1 This is a perspective view of the present invention;

[0019] Figure 2 This is a schematic diagram of the half-section structure of the present invention;

[0020] Figure 3 yes Figure 2 Cross-sectional view along the AA direction.

[0021] in:

[0022] 1. Tool body 2. Sealing ring

[0023] 3. Inner elastic sleeve; 4. Wear-resistant plate.

[0024] 5 Inner bushing 6 Outer pressure sleeve

[0025] 7 Locking sleeve 8 Snap ring

[0026] 9. Vulcanized rubber parts.

[0027] For those skilled in the art, other related figures can be obtained from the above figures without any creative effort. Detailed Implementation

[0028] To enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0029] like Figures 1-3 As shown, a pressurized sliding packer for oil wells includes a tool body 1, and an inner elastic sleeve 3 and an inner liner 5 sequentially sleeved on the outside of the tool body 1; multiple wear-resistant plates 4 are arranged around the circumference of the inner elastic sleeve 3, and the wear-resistant plates 4 are fixed to the inner elastic sleeve 3 by vulcanized rubber parts 9; one end of the inner liner 5 is inserted into the inner elastic sleeve 3, and an outer pressure sleeve 6 is sleeved on the outside of the inner liner 5, and a locking sleeve 7 is provided between the outer pressure sleeve 6 and the inner liner 5.

[0030] The tool body 1 is fitted with a retaining ring 8, which is set tightly against the end face of the locking sleeve 7.

[0031] The inner elastic sleeve 3 adopts a segmented structure design, including a connecting collar and multiple spring pieces connected to the connecting collar. The spring pieces are evenly distributed around the circumference of the connecting collar. The connecting collar is a stepped sleeve structure, with its small-diameter end inner wall threaded to the tool body 1, and its large-diameter end having a gap with the outer wall of the tool body 1. One end of each spring piece is connected to the large-diameter end face of the connecting collar, and the other end is in close contact with the end face of the locking sleeve 7. A sealing ring 2 is provided between the small-diameter end inner wall of the connecting collar and the tool body 1, and the sealing ring 2 is located outside the connecting thread between the small-diameter end of the connecting collar and the tool body 1.

[0032] The tool body 1 is a stepped tubular structure, with an external thread at the end near the retaining ring 8 and a large-diameter end at the end near the sealing ring 2.

[0033] The inner sleeve 5 is a sleeve-type structure with a convex ring formed on the inner wall of one end. The convex ring is threaded to the outer wall of the tool body 1. The outer wall of the inner sleeve 5 is tightly fitted with the inner walls of the inner elastic sleeve 3 and the locking sleeve 7. The inner sleeve 5 supports the inner elastic sleeve 3.

[0034] One end of the outer pressure sleeve 6 is fitted onto the outside of the inner elastic sleeve 3, and the inner wall of the other end forms a convex ring. The convex ring is threaded to the outer wall of the tool body 1, and the bottom surface of the convex ring end of the outer pressure sleeve 6 is a conical bottom.

[0035] The locking sleeve 7 has a sleeve-type structure with a convex ring formed on the inner wall of one end. The convex ring is placed between the inner bushing 5 and the outer pressure sleeve 6 convex ring, and the locking sleeve 7 presses the wear-resistant plate 4 and the spring plate.

[0036] The wear-resistant plate 4 has an arc-shaped plate structure with protrusions formed on its inner sidewall. These protrusions are located in the gap between two adjacent elastic plates and are fixed to the inner elastic sleeve 3 by vulcanized rubber parts 9. The cross-section of the protrusions is convex. The outer curvature of the wear-resistant plate 4 is the same as the inner diameter curvature of the sleeve used. In its natural state after vulcanization, the outer diameter of the tool body is slightly larger than the inner diameter of the sleeve.

[0037] The cross-section of the vulcanized rubber part 9 is convex, with the steps on both sides vulcanized and fixed to the wear-resistant sheet 4, and the inner side vulcanized and fixed to the inner elastic sleeve 3. The arc of the part of the vulcanized rubber part 9 that extends out of the gap between two adjacent elastic sheets is the same as the arc of the inner diameter of the sleeve. In its natural state after vulcanization, the outer diameter is slightly smaller than the outer diameter of the wear-resistant sheet, and it is in a retracted state.

[0038] The outer diameter of the tool is larger than the inner diameter of the casing to be used. After the tool is lowered into the well, it can seal the annulus of the casing. When the working string slides down, the wear-resistant plate 4 compresses the vulcanized rubber part 9 and the inner elastic sleeve 3, the outer diameter of the tool shrinks, the outer side of the wear-resistant plate 4 fits against the inner wall of the casing, and the wear-resistant plate 4 rubs against the inner wall of the casing. The exposed part of the vulcanized rubber part 9 is compressed and fits against the inner wall of the casing. The friction between the vulcanized rubber part 9 and the inner wall of the casing is small. Therefore, it can meet the requirements of pressurized sliding sealing in the field.

[0039] The operating method of this invention:

[0040] During well completion or workover operations in oilfields, when performing tasks such as scraping and sand flushing, the packer tool of this invention is connected to the working tubing string. The initial outer diameter of the tool is larger than the inner diameter of the casing. After being run into the well, the wear-resistant plate is retracted by compressing the rubber, and the tool fits against the inner wall of the casing. When the annulus is pressurized, it can play a sealing role and meet the requirements of pressurized sliding packer in field operations.

[0041] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0042] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0043] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0044] The applicant declares that the above description is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention fall within the protection and disclosure scope of the present invention.

Claims

1. A pressurized sliding packer for oil wells, characterized in that: The tool body (1) includes an inner elastic sleeve (3) and an inner liner (5) which are sequentially fitted around the tool body (1); multiple wear-resistant plates (4) are arranged around the circumference of the inner elastic sleeve (3), and the wear-resistant plates (4) and the inner elastic sleeve (3) are fixed by vulcanized rubber parts (9); one end of the inner liner (5) is inserted into the inner elastic sleeve (3), and an outer pressure sleeve (6) is fitted around the inner liner (5), and a locking sleeve (7) is provided between the outer pressure sleeve (6) and the inner liner (5); The inner elastic sleeve (3) includes a connecting collar and multiple spring pieces connected to the connecting collar. The spring pieces are evenly distributed around the circumference of the connecting collar. The connecting collar is a stepped sleeve structure. Its small diameter end inner wall is threaded to the tool body (1), and its large diameter end is spaced apart from the outer wall of the tool body (1). One end of the spring piece is connected to the large diameter end face of the connecting collar, and the other end is in close contact with the end face of the locking sleeve (7). The wear-resistant sheet (4) is an arc-shaped plate structure with a protrusion formed on its inner sidewall. The protrusion is located in the gap between two adjacent spring sheets, and the cross section of the protrusion is convex. The outer arc of the wear-resistant plate (4) is the same as the inner arc of the sleeve used; The vulcanized rubber part (9) has a convex cross section. The steps on both sides are vulcanized and fixed with the wear-resistant sheet (4), and the inner side is vulcanized and fixed with the inner elastic sleeve (3). The arc of the part of the vulcanized rubber part (9) that extends out of the gap between two adjacent elastic sheets is the same as the arc of the inner diameter of the sleeve. In its natural state after vulcanization, the outer diameter of the tool body (1) is slightly larger than the inner diameter of the sleeve used; the outer diameter of the vulcanized rubber part (9) is slightly smaller than the outer diameter of the wear-resistant sheet, and it is in a shrinking state.

2. The pressurized sliding packer for oil wells according to claim 1, characterized in that: A sealing ring (2) is provided between the inner wall of the small diameter end of the connecting collar and the tool body (1). The sealing ring (2) is located on the outer side of the connecting thread between the small diameter end of the connecting collar and the tool body (1).

3. The pressurized sliding packer for oil wells according to claim 1, characterized in that: The inner sleeve (5) is a sleeve-type structure with a convex ring formed on the inner wall at one end. The convex ring is threaded to the outer wall of the tool body (1). The outer wall of the inner sleeve (5) is tightly fitted with the inner elastic sleeve (3) and the inner wall of the locking sleeve (7).

4. The pressurized sliding packer for oil wells according to claim 1, characterized in that: One end of the outer pressure sleeve (6) is fitted outside the inner elastic sleeve (3), and the inner wall of the other end forms a convex ring. The convex ring is threaded to the outer wall of the tool body (1), and the bottom surface of the convex ring end of the outer pressure sleeve (6) is a conical bottom.

5. The pressurized sliding packer for oil wells according to claim 1, characterized in that: The locking sleeve (7) is a sleeve-type structure with a convex ring formed on the inner wall of one end. The convex ring is placed between the inner bushing (5) and the convex ring of the outer pressure sleeve (6).

6. The pressurized sliding packer for oil wells according to claim 1, characterized in that: The tool body (1) is fitted with a retaining ring (8), and the retaining ring (8) is set tightly against the end face of the locking sleeve (7).

Images