High-temperature-resistant packer rubber sleeve

Abstract

The utility model relates to the technical field of downhole tool accessories, in particular to a high-temperature-resistant packer rubber sleeve. Comprising a middle cylinder, an outer rubber cylinder is arranged on the outer side of the middle cylinder, an inner rubber cylinder is arranged on the inner side of the middle cylinder, a plurality of penetrating holes are formed in the upper portion and the lower portion of the middle cylinder, the middle cylinder, the inner rubber cylinder and the outer rubber cylinder are integrally vulcanized and formed, connecting parts are arranged in the penetrating holes, and the connecting parts, the inner rubber cylinder and the outer rubber cylinder are integrally formed; and the end parts of the outer rubber barrel and the inner rubber barrel are inserted into the end rings on one sides of the outer rubber barrel and the inner rubber barrel. A mechanical interlocking structure of the inner rubber layer, the outer rubber layer and the middle cylinder is formed through the integral vulcanization molding design of the middle cylinder, the outer rubber cylinder and the inner rubber cylinder and the connection part embedded in the through hole. The high-temperature stability of the middle cylinder made of polytetrafluoroethylene and the elasticity of rubber have a synergistic effect, so that the material stability at high temperature is guaranteed, the radial expansion capacity is enhanced through the outward-protruding deformation design of the middle section, and the sealing performance is remarkably improved.

Description

Technical Field

[0001] This utility model relates to the field of downhole tool accessories technology, specifically to a high-temperature resistant packer rubber sleeve. Background Technology

[0002] Deep oil and gas resource development has become the most important area of ​​future oil and gas exploration and development. Deep oil and gas resource development is characterized by complex and variable reservoir structural stress, generally low natural production capacity, high temperature, and high construction pressure, which places increasingly higher demands on packer performance.

[0003] Due to the significant increase in well depth, pressure, and temperature, packer sleeves face extremely harsh working environments, which may lead to sealing failure, causing an increase in wellbore annular pressure, and in severe cases, major safety accidents. Therefore, the design of temperature resistance, pressure resistance, corrosion resistance, and creep resistance of packer sleeves and the development of high-performance packer sleeves are very important and urgent tasks.

[0004] The patent document with publication number CN206220914U discloses a packer with high temperature and high pressure resistance, corrosion resistance and creep resistance. Both ends of the packer are equipped with shoulder protective sleeves, which can effectively improve the mechanical performance and service life of the packer for well testing and completion, and reduce the risk of wellbore seal failure and increased casing pressure.

[0005] Patent document CN215761598U discloses a packer sleeve and a packer, comprising multiple sealing ring units sequentially along the axial direction. The multiple sealing ring units include a first sealing ring unit and a second sealing ring unit located downstream of the first sealing ring unit. The first sealing ring unit is made of a high-temperature resistant material, and the second sealing ring unit is made of graphite. It also includes a first metal sleeve covering the outside of the first sealing ring unit. The first metal sleeve has inwardly tapered ends and outwardly protruding ends, and has a horizontal section at its end face. Furthermore, it includes a second metal sleeve covering the outside of the second sealing ring unit and a third metal sleeve covering the outside of the third sealing ring unit.

[0006] In the prior art, a conical sleeve is installed at both ends of the rubber tube to prevent shoulder protrusion during the compression process. However, under high temperature conditions, the rubber tube softens. When high pressure is applied to the rubber tube, the softened shoulder of the rubber tube is prone to detach from the conical sleeve, forming a shoulder protrusion. Utility Model Content

[0007] The main objective of this invention is to provide a high-temperature resistant packer sleeve that can prevent shoulder protrusion at the sleeve's shoulder under high temperature and high pressure environments. This high-temperature resistant packer sleeve exhibits excellent sealing performance under high temperature and high pressure conditions.

[0008] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0009] A high-temperature resistant packer sleeve includes an intermediate cylinder, an outer sleeve on the outside of the intermediate cylinder, and an inner sleeve on the inside of the intermediate cylinder. Multiple perforations are provided at the upper and lower parts of the intermediate cylinder. The intermediate cylinder, the inner sleeve, and the outer sleeve are integrally vulcanized. A connecting part is provided in the perforation. The connecting part, the inner sleeve, and the outer sleeve are integrally formed. End rings are fixedly connected to the upper and lower ends of the intermediate cylinder. The ends of the outer sleeve and the inner sleeve are inserted into the end rings on one side.

[0010] Specifically, the intermediate cylinder includes an intermediate section, with vertical sections at both ends of the intermediate section. The intermediate section is integrally formed with the two vertical sections, and the middle part of the intermediate section protrudes outward.

[0011] Specifically, the intermediate cylinder is made of polytetrafluoroethylene.

[0012] Specifically, the inner and outer rubber tubes are made of high-temperature resistant rubber.

[0013] Specifically, the inner edge of the outer rubber tube is fitted with the outer edge of the middle section of the intermediate tube, and the outer edge of the inner rubber tube is fitted with the inner edge of the middle section of the intermediate tube.

[0014] Specifically, the inner edge of the inner tube is machined with a guide ring groove with an inverted V-shaped cross-section.

[0015] Specifically, the end ring has an insertion groove on the side facing the middle cylinder, and the vertical section is inserted into the insertion groove of the end ring on one side.

[0016] Specifically, the outer rubber tube has an outer ring groove at its end, and an outer convex ring is machined on the end ring. The outer convex ring is inserted and fixed in the outer ring groove. The inner rubber tube has an inner ring groove at its end, and an inner convex ring is machined on the end ring. The inner convex ring is inserted and fixed in the inner ring groove.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] 1. The integrated vulcanization design of the intermediate cylinder, outer rubber cylinder, and inner rubber cylinder, combined with the perforated embedded connecting part, forms a mechanically interlocking structure between the inner and outer rubber layers and the intermediate cylinder. The synergistic effect of the high-temperature stability of the PTFE intermediate cylinder and the elasticity of the rubber not only ensures the stability of the material at high temperatures, but also enhances the radial expansion capacity through the outward deformation design of the middle section, significantly improving the sealing performance.

[0019] 2. The end ring is fixed by inserting an outer convex ring and an inner convex ring into the outer and inner ring grooves, and reinforced with adhesive to form a multi-layered anti-detachment locking structure. This design effectively limits the lateral displacement of the rubber sleeve end under high pressure, avoiding shoulder detachment caused by high-temperature softening.

[0020] 3. The inverted V-shaped guide ring groove on the inner side of the inner rubber sleeve guides the inner rubber sleeve to expand evenly in a preset direction under axial pressure, avoiding asymmetrical deformation caused by local stress concentration. Combined with the arc-shaped protrusion structure of the intermediate cylinder, this achieves controllable deformation of the rubber sleeve under stress, improving the sealing interface fit.

[0021] 4. The intermediate cylinder is made of polytetrafluoroethylene (PTFE) and the inner and outer rubber cylinders are made of high-temperature resistant rubber. The temperature resistance and low coefficient of friction of PTFE can suppress high-temperature creep, while the joint formed after rubber vulcanization further strengthens the interface bonding, ensuring that the material does not delaminate or fail under extreme temperature and pressure conditions.

[0022] 5. The matching design of the vertical section of the intermediate cylinder and the insertion groove of the end ring enables rapid positioning and assembly of the rubber sleeve assembly. At the same time, the tight fit between the intermediate section and the inner and outer rubber sleeves reduces the impact of assembly errors on sealing performance and improves the overall structural reliability. Attached Figure Description

[0023] Figure 1 This is a cross-sectional view of the present invention.

[0024] Figure 2 This is a schematic diagram of the intermediate cylinder.

[0025] Figure 3 This is a schematic diagram of the end ring.

[0026] Figure 4 This is a schematic diagram showing the assembly of the outer rubber tube, inner rubber tube, and intermediate tube.

[0027] The parts in the attached diagram are named as follows: 1. Intermediate cylinder, 101. Intermediate section, 102. Vertical section, 103. Perforation, 2. Outer rubber cylinder, 201. Outer annular groove, 3. Inner rubber cylinder, 301. Inner annular groove, 4. Guide ring groove, 5. End ring, 501. Outer convex ring, 502. Inner convex ring, 503. Insertion ring groove, 6. Connecting part. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0029] Example 1: Refer to Figures 1-2 As shown, a high-temperature resistant packer sleeve includes an intermediate cylinder 1 made of polytetrafluoroethylene (PTFE). An outer sleeve 2 is disposed on the outer side of the intermediate cylinder 1, and an inner sleeve 3 is disposed on the inner side of the intermediate cylinder 1. Both the inner sleeve 3 and the outer sleeve 2 are made of high-temperature resistant rubber.

[0030] Multiple perforations 103 are provided at the upper and lower parts of the intermediate cylinder 1. The intermediate cylinder 1, the inner rubber cylinder 3 and the outer rubber cylinder 2 are integrally vulcanized. A connecting part 6 is provided in the perforation 103. The connecting part 6, the inner rubber cylinder 3 and the outer rubber cylinder 2 are integrally formed. An end ring 5 is fixedly connected to the upper and lower ends of the intermediate cylinder 1. The ends of the outer rubber cylinder 2 and the inner rubber cylinder 3 are inserted into the end ring 5 on one side.

[0031] The intermediate cylinder 1 includes an intermediate section 101, with vertical sections 102 at both ends. The intermediate section 101 and the two vertical sections 102 are integrally formed, and the middle part of the intermediate section 101 protrudes outward. The inner edge of the outer rubber cylinder 2 is fitted with the outer edge of the intermediate section 101 of the intermediate cylinder 1, and the outer edge of the inner rubber cylinder 3 is fitted with the inner edge of the intermediate section 101 of the intermediate cylinder 1.

[0032] The inner edge of the inner rubber cylinder 3 has a guide ring groove 4 with an inverted V-shaped cross section.

[0033] The end ring 5 has an insertion groove 503 on the side facing the middle cylinder 1, and the vertical section 102 is inserted into the insertion groove 503 of the end ring 5 on one side.

[0034] When the outer rubber tube 2, intermediate tube 1, and inner rubber tube 3 are integrally vulcanized in the mold, the high-temperature resistant rubber used to make the inner rubber tube 3 and outer rubber tube 2 enters the perforation 103. After the outer rubber tube 2, intermediate tube 1, and inner rubber tube 3 are integrally vulcanized in the mold, a connecting part 6 is formed inside the perforation 103. The connecting part 6 fixes the ends of the outer rubber tube 2 and inner rubber tube 3, thereby improving the connection strength of the outer rubber tube 2, intermediate tube 1, and inner rubber tube 3. This ensures that the inner rubber tube 3 and outer rubber tube 2 maintain the connection strength at their ends under high temperature and high pressure conditions, avoiding shoulder protrusion.

[0035] The middle section 101 of the intermediate cylinder 1 protrudes outward from the middle and is made of polytetrafluoroethylene, which provides high temperature resistance and can effectively deform and expand, thus achieving a sealing effect in high temperature and high pressure environments.

[0036] By setting the guide ring groove 4, after the ends of the intermediate cylinder 1, outer rubber cylinder 2 and inner rubber cylinder 3 are pressed, the middle part of the inner rubber cylinder 3 can smoothly bulge outward under the guidance of the guide ring groove 4.

[0037] Example 2: Based on Example 1, referring to... Figure 1 , Figure 3 and Figure 4 As shown, the outer rubber tube 2 has an outer ring groove 201 at its end, and an outer convex ring 501 is machined on the end ring 5. The outer convex ring 501 is inserted and fixed in the outer ring groove 201. The inner rubber tube 3 has an inner ring groove 301 at its end, and an inner convex ring 502 is machined on the end ring 5. The inner convex ring 502 is inserted and fixed in the inner ring groove 301.

[0038] The outer protruding ring 501 of the end ring 5 is inserted and fixed in the outer ring groove 201, and the inner protruding ring 502 is inserted and fixed in the inner ring groove 301. In this embodiment, the end ring 5 is bonded and fixed to the outer rubber tube 2 and the inner rubber tube 3 by adhesive. The end connection strength between the end ring 5 and the outer rubber tube 2 and the inner rubber tube 3 is high. After the end ring 5 squeezes the outer rubber tube 2, the inner rubber tube 3 and the intermediate tube 1, it can prevent the end ring 5 from separating from the outer rubber tube 2 and the inner rubber tube 3, and further avoid the occurrence of shoulder protrusion.

[0039] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A high temperature resistant packer rubber sleeve, comprising a middle sleeve (1), an outer rubber sleeve (2) arranged outside the middle sleeve (1), and an inner rubber sleeve (3) arranged inside the middle sleeve (1), characterized in that, Multiple perforations (103) are provided at the upper and lower parts of the intermediate cylinder (1). The intermediate cylinder (1), the inner rubber cylinder (3) and the outer rubber cylinder (2) are integrally vulcanized. A connecting part (6) is provided in the perforation (103). The connecting part (6), the inner rubber cylinder (3) and the outer rubber cylinder (2) are integrally formed. An end ring (5) is fixedly connected to the upper and lower ends of the intermediate cylinder (1). The ends of the outer rubber cylinder (2) and the inner rubber cylinder (3) are inserted into the end ring (5) on one side.

2. The high temperature resistant packer element of claim 1, wherein, The intermediate cylinder (1) includes an intermediate section (101), and vertical sections (102) are provided at both ends of the intermediate section (101). The intermediate section (101) and the two vertical sections (102) are integrally formed, and the middle part of the intermediate section (101) protrudes outward.

3. The high temperature resistant packer element of claim 1, wherein, The intermediate cylinder (1) is made of polytetrafluoroethylene.

4. The high temperature resistant packer element of claim 1, wherein, The inner rubber tube (3) and the outer rubber tube (2) are made of high-temperature resistant rubber.

5. The high temperature resistant packer element of claim 2, wherein, The inner edge of the outer rubber tube (2) is attached to the outer edge of the middle section (101) of the middle tube (1), and the outer edge of the inner rubber tube (3) is attached to the inner edge of the middle section (101) of the middle tube (1).

6. The high temperature resistant packer element of claim 1, wherein, The inner rubber cylinder (3) has a guide ring groove (4) with an inverted V-shaped cross-section machined in the middle of its inner edge.

7. The high temperature resistant packer element of claim 2, wherein, The end ring (5) has an insertion groove (503) on the side facing the middle cylinder (1), and the vertical section (102) is inserted into the insertion groove (503) of the end ring (5) on one side.

8. The high temperature resistant packer element of claim 1, wherein, The outer rubber tube (2) has an outer ring groove (201) at its end, and an outer convex ring (501) is machined on the end ring (5). The outer convex ring (501) is inserted and fixed in the outer ring groove (201). The inner rubber tube (3) has an inner ring groove (301) at its end, and an inner convex ring (502) is machined on the end ring (5). The inner convex ring (502) is inserted and fixed in the inner ring groove (301).

Images