High temperature and high pressure packer airproof rubber cylinder

Abstract

The application discloses a high-temperature and high-pressure packer air-tight rubber cylinder, which comprises a middle rubber cylinder, the middle rubber cylinder is symmetrically arranged in the up-down direction with the center horizontal plane as the center, first shoulder guards are arranged at the upper and lower ends of the middle rubber cylinder respectively, two groups of the first shoulder guards are symmetrically distributed with the center horizontal plane as the center, synthetic edge rubber cylinders are arranged outside the two groups of the first shoulder guards respectively, the synthetic edge rubber cylinder comprises an edge rubber cylinder, an edge rubber cylinder support ring and a second shoulder guard, the edge rubber cylinder, the edge rubber cylinder support ring and the second shoulder guard are integrally vulcanized and formed, two groups of the synthetic edge rubber cylinders are symmetrically distributed with the center horizontal plane as the center, pressure rings are arranged outside the two groups of the synthetic edge rubber cylinders respectively, and the two groups of the pressure rings are symmetrically distributed with the center horizontal plane as the center. The application has the advantages of simple structure, convenient operation, suitability for high-temperature and high-pressure working environments, difficulty in appearing shoulder protrusion instability, good sealing effect, recyclability, low setting force and the like.

Description

Technical Field

[0001] This invention belongs to the field of oilfield drilling and production technology, and in particular relates to a high-temperature and high-pressure packer airtight rubber sleeve. Background Technology

[0002] Currently, my country has a variety of oil reservoir types and development methods, broadly including self-flowing development, water injection development, gas-driven development, and thermal recovery development. Production enhancement measures include acidizing and fracturing. Therefore, different development methods are needed to address different development environments such as temperature and pressure. The requirements for temperature environments are mainly related to sealing materials, while the requirements for pressure environments are not only related to sealing materials but, more importantly, determined by the structure and form of the sealing components.

[0003] The downhole sealing environment is complex and harsh, and the continuous development of oil wells into deep and ultra-deep wells further complicates and intensifies the working environment. Furthermore, the working environment in deep and ultra-deep oilfields can experience abrupt changes due to pressure differentials and other factors, leading to porosity in the rubber seals and significantly reducing their lifespan. In the harsh downhole working environment, the combined effects of high temperature, high pressure, and corrosive media cause the performance of rubber or polymer materials used as seals to deteriorate rapidly with increasing temperature. The combined effects of high temperature and corrosive media can cause seal materials to lose their thermal stability and chemical resistance, rendering them unusable. Some rubber and polymer materials can only maintain stable operation for a short period under high temperature and high pressure conditions, resulting in significant waste of human and material resources. Summary of the Invention

[0004] The problem to be solved by the present invention is to provide an airtight rubber sleeve; especially in high temperature and high pressure working environment, it does not have "shoulder protrusion" instability, achieves a good sealing effect, can be recycled and reused, and has a low setting force.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a high-temperature and high-pressure packer airtight rubber sleeve, including a middle rubber sleeve, the middle rubber sleeve being symmetrically arranged in the vertical direction with the central horizontal plane as the center, the upper and lower ends of the middle rubber sleeve being respectively provided with first shoulders, two sets of first shoulders being symmetrically distributed with the central horizontal plane as the center, synthetic side rubber sleeves being provided on the outer side of the two sets of first shoulders, the two sets of synthetic side rubber sleeves being symmetrically distributed with the central horizontal plane as the center, and pressure rings being provided on the outer side of the two sets of synthetic side rubber sleeves, the two sets of pressure rings being symmetrically distributed with the central horizontal plane as the center.

[0006] Furthermore, the intermediate rubber tube is a cylindrical ring, and a first chamfer is provided at the outer edge of the top and the outer edge of the bottom of the intermediate rubber tube. A first annular groove is provided at the center of the intermediate rubber tube in the horizontal direction. The first annular groove is coaxial with the intermediate rubber tube, and the cross-section of the first annular groove is U-shaped.

[0007] Furthermore, the first shoulder guard is a frustum-shaped column, and the large circular surface of the first shoulder guard is provided with a second annular groove. The cross-section of the second annular groove is an isosceles trapezoid. The second annular groove is fitted onto the outer cylindrical surface of the middle rubber tube. The small circular surface of the first shoulder guard is provided with a third annular groove. The cross-section of the third annular groove is rectangular, and the end of the third annular groove contacts the synthetic edge rubber tube.

[0008] Furthermore, the synthetic edge rubber tube includes an edge rubber tube, an edge rubber tube support ring, and a second shoulder, wherein the edge rubber tube, the edge rubber tube support ring, and the second shoulder are integrally vulcanized.

[0009] Furthermore, the side rubber tube is a frustum-shaped cylinder, and the large circular surface of the side rubber tube is provided with a fourth annular groove. The cross-section of the fourth annular groove is an isosceles trapezoid. The fourth annular groove contacts the first shoulder guard. The small circular surface of the side rubber tube is provided with a fifth annular groove. The cross-section of the fifth annular groove is "V". The side rubber tube support ring is placed in the fifth annular groove.

[0010] Furthermore, the second shoulder guard is a cylindrical ring, with a fourth chamfer at the outer edge of the top of the second shoulder guard, a sixth annular groove at the bottom of the second shoulder guard, the sixth annular groove having an isosceles trapezoidal cross-section, the side rubber tube being placed in the sixth annular groove, a seventh annular groove at the top of the second shoulder guard, the seventh annular groove having a rectangular cross-section, and the pressure ring being placed in the seventh annular groove.

[0011] Furthermore, both the middle rubber tube and the side rubber tube are made of fluororubber, the first shoulder guard is made of polytetrafluoroethylene, and the second shoulder guard is made of 316 stainless steel.

[0012] Furthermore, the pressure ring is a boss-shaped cylinder, the small cylinder of the pressure ring is placed in the seventh annular groove, and the inner surface of the large cylinder of the pressure ring is provided with an eighth groove, the cross-section of which is rectangular.

[0013] Furthermore, the outer edge of the large cylindrical part of the pressure ring is provided with a fifth chamfer near the end of the small cylindrical part of the pressure ring, and the fifth chamfer is 45°.

[0014] Furthermore, the pressure ring is made of 42CrMo material.

[0015] The advantages and positive effects of this invention are:

[0016] 1. The present invention has a simple structure, is easy to operate, is suitable for high temperature and high pressure working environment, is not prone to "shoulder protrusion" instability, can achieve a good sealing effect, can be recycled and reused, and has a low setting force.

[0017] 2. The middle rubber cylinder of this invention is made of fluororubber. The middle rubber cylinder plays a major supporting role in the overall structure of the packer, while also inducing full deformation of the middle rubber cylinder. A U-shaped groove is designed in the middle of the middle rubber cylinder, which can induce full deformation of the middle rubber cylinder to obtain higher contact stress and improve the sealing ability of the packer.

[0018] 3. The first shoulder of the present invention is made of polytetrafluoroethylene, which can prevent the middle rubber tube from protruding and flowing outward along the annular space when it is deformed during setting, thereby improving the contact and maintaining the contact stress, and also has the function of preventing the rubber tube from protruding.

[0019] 4. The side rubber tube, side rubber tube support ring, and second shoulder of this invention are integrally vulcanized. The side rubber tube is made of fluororubber, and the side rubber tube support ring is made of alloy steel. This provides support for the side rubber tube. Under high loads, the rubber tube with the support ring is more likely to remain stable, and its stable deformation load is greater. The second shoulder is made of 316 stainless steel, which prevents the side rubber tube from protruding and flowing outward along the annular space during setting deformation, thereby improving contact and maintaining contact stress, and preventing shoulder protrusion of the rubber tube.

[0020] 5. The pressure ring of this invention is made of 42CrMo material and is a rigid component. It can apply axial pressure to the airtight rubber sleeve of the high-temperature and high-pressure packer, causing it to deform laterally, thereby achieving a sealing effect. The shape of the pressure ring facilitates full deformation of the side rubber sleeve, increasing the contact area between the side rubber sleeve and the inner wall of the sealing cylinder during setting, thus improving the sealing capacity. The two right-angle bends on the outer side are chamfered at 45°, which effectively avoids stress concentration caused by overall pressure on the structure, thereby improving the service life of the component. Attached Figure Description

[0021] Figure 1 This is a cross-sectional view of the overall structure of an embodiment of the present invention.

[0022] Figure 2 This is a cross-sectional view of the rubber tube in an embodiment of the present invention.

[0023] Figure 3 This is a cross-sectional view of the first shoulder guard according to an embodiment of the present invention.

[0024] Figure 4 This is a cross-sectional view of the synthetic edge rubber tube according to an embodiment of the present invention.

[0025] Figure 5 This is a cross-sectional view of the side rubber tube according to an embodiment of the present invention.

[0026] Figure 6 This is a cross-sectional view of the side rubber tube support ring according to an embodiment of the present invention.

[0027] Figure 7 This is a cross-sectional view of the second shoulder guard according to an embodiment of the present invention.

[0028] Figure 8 This is a cross-sectional view of the pressure ring according to an embodiment of the present invention.

[0029] In the picture:

[0030] 1. Middle rubber cylinder 1-1, First annular groove 1-2, First chamfer

[0031] 1-3, Center hole of the rubber tube;

[0032] 2. First shoulder guard 2-1, third annular groove 2-2, second annular groove

[0033] 2-3, Second chamfer;

[0034] 3. Side rubber tube 3-1, fifth annular groove 3-2, fourth annular groove

[0035] 3-3, Third chamfer;

[0036] 4. Side rubber sleeve support ring;

[0037] 5. Second shoulder guard 5-1, Seventh annular groove 5-2, Sixth annular groove

[0038] 5-3, Fourth chamfer;

[0039] 6. Pressure ring 6-1, eighth annular groove 6-2, pressure ring center hole

[0040] 6-3, Fifth chamfer. Detailed Implementation

[0041] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[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 can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0044] The embodiments of the present invention will be further described below with reference to the accompanying drawings:

[0045] like Figure 1 As shown, a high-temperature and high-pressure packer airtight rubber sleeve includes a middle rubber sleeve 1, which is symmetrically arranged vertically with the central horizontal plane as the center. The middle rubber sleeve 1 is provided with first shoulders 2 at its upper and lower ends, and two sets of first shoulders 2 are symmetrically distributed with the central horizontal plane as the center. Synthetic side rubber sleeves are provided on the outer side of the two sets of first shoulders 2, and two sets of synthetic side rubber sleeves are symmetrically distributed with the central horizontal plane as the center. Pressure rings 6 are provided on the outer side of the two sets of synthetic side rubber sleeves, and two sets of pressure rings 6 are symmetrically distributed with the central horizontal plane as the center.

[0046] This embodiment is suitable for high temperature and high pressure working environments, is not prone to "shoulder protrusion" instability, can achieve a good sealing effect, can be recycled and reused, and has a low setting force.

[0047] Specifically, such as Figure 2 As shown, the intermediate rubber cylinder 1 provided in this embodiment is a cylindrical annular body. The outer edge of the top of the intermediate rubber cylinder 1 and the outer edge of the bottom of the intermediate rubber cylinder 1 are provided with a first chamfer 1-2. The center of the intermediate rubber cylinder 1 in the horizontal direction is provided with a first annular groove 1-1. The first annular groove 1-1 is coaxial with the intermediate rubber cylinder 1. The cross-section of the first annular groove 1-1 is U-shaped. The diameter of the edge of the first annular groove 1-1 is consistent with the inner diameter of the central hole 1-3 of the intermediate rubber cylinder. The diameter of the center of the first annular groove 1-1 is larger than the inner diameter of the central hole 1-3 of the intermediate rubber cylinder.

[0048] In this embodiment, the middle rubber cylinder 1 is made of fluororubber. The middle rubber cylinder 1 plays a major supporting role in the overall structure of the packer, while also inducing full deformation of the middle rubber cylinder 1. A U-shaped groove is designed in the middle of the middle rubber cylinder 1, which can induce full deformation of the middle rubber cylinder 1 to obtain higher contact stress and improve the sealing capability of the packer.

[0049] The upper and lower ends of the middle rubber tube 1 are respectively provided with first shoulder guards 2, such as Figure 3 As shown, the first shoulder guard 2 is a frustum-shaped cylinder. The large circular surface of the first shoulder guard 2 has a second annular groove 2-2. The cross-section of the second annular groove 2-2 is an isosceles trapezoid. The inclination angle of the second annular groove 2-2 is consistent with the angle of the first chamfer 1-2 at the outer edge of the top and bottom of the middle rubber cylinder 1. The second annular groove 2-2 is fitted onto the outer cylindrical surface of the middle rubber cylinder 1. The small circular surface of the first shoulder guard 2 has a third annular groove 2-1. The cross-section of the third annular groove 2-1 is rectangular. The diameter of the third annular groove 2-1 is consistent with the inner diameter of the central hole 1-3 of the middle rubber cylinder. The end of the third annular groove 2-1 contacts the synthetic edge rubber cylinder.

[0050] In this embodiment, the first shoulder 2 is made of polytetrafluoroethylene, which can prevent the middle rubber tube 1 from protruding and flowing outward along the annular space when it is deformed during the setting process, thereby improving the contact and maintaining the contact stress, and also preventing the rubber tube from protruding.

[0051] The synthetic rubber sleeve comprises a rubber sleeve 3, a rubber sleeve support ring 4, and a second shoulder 5, all integrally vulcanized. The rubber sleeve 3, support ring 4, and shoulder 5 are made of fluororubber, while the support ring 4 is made of alloy steel. The support ring 4 provides support for the rubber sleeve 3. Under high loads, the rubber sleeve 3 with the support ring 4 is more stable and has a greater stable deformation load. The second shoulder 5 is made of 316 stainless steel, preventing the rubber sleeve 3 from protruding and flowing outwards along the annular space during setting deformation, thereby improving contact and maintaining contact stress, and preventing shoulder protrusion of the rubber sleeve.

[0052] Specifically, such as Figure 4 , Figure 5 As shown, the side rubber tube 3 is a frustum-shaped cylinder. The large circular surface of the side rubber tube 3 has a fourth annular groove 3-2. The cross-section of the fourth annular groove 3-2 is an isosceles trapezoid. The inclination angle of the fourth annular groove 3-2 is consistent with the angle of the second chamfer 2-3 at the outer edge of the top of the first shoulder 2. The fourth annular groove 3-2 is fitted onto the outer cylindrical surface of the first shoulder 2. The small circular surface of the side rubber tube 3 has a fifth annular groove 3-1. The cross-section of the fifth annular groove 3-1 is "V" shaped, as shown... Figure 6 As shown, the side rubber tube support ring 4 is placed in the fifth annular groove 3-1.

[0053] like Figure 4 , Figure 7As shown, the second shoulder guard 5 is a cylindrical ring. The second shoulder guard 5 has a fourth chamfer 5-3 at the outer edge of its top. The second shoulder guard 5 has a sixth annular groove 5-2 at its bottom. The sixth annular groove 5-2 has an isosceles trapezoidal cross section. The inclination angle of the sixth annular groove 5-2 is consistent with the angle of the third chamfer 3-3 at the outer edge of the top of the side rubber tube 3. The side rubber tube 3 is placed in the sixth annular groove 5-2. The second shoulder guard 5 has a seventh annular groove 5-1 at its top. The seventh annular groove 5-1 has a rectangular cross section. The diameter of the seventh annular groove 5-1 is larger than the inner diameter of the central hole 1-3 of the middle rubber tube. The pressure ring 6 is placed in the seventh annular groove 5-1.

[0054] like Figure 8 As shown, the pressure ring 6 is a boss-shaped cylinder. The small cylinder of the pressure ring 6 is placed in the seventh annular groove 5-1. The inner surface of the large cylinder of the pressure ring 6 is provided with an eighth annular groove 6-1. The cross-section of the eighth annular groove 6-1 is rectangular. The diameter of the eighth annular groove 6-1 is larger than the inner diameter of the pressure ring center hole 6-2. The inner diameter of the pressure ring center hole 6-2 is consistent with the inner diameter of the center hole 1-3 of the middle rubber tube. The outer edge of the large cylinder of the pressure ring 6 is provided with a fifth chamfer 6-3 near the end of the small cylinder of the pressure ring 6. The fifth chamfer 6-3 is 45°.

[0055] In this embodiment, the pressure ring 6 is made of 42CrMo material and is a rigid component. It can apply axial pressure to the airtight rubber sleeve of the high-temperature and high-pressure packer, causing it to deform laterally, thereby achieving a sealing effect. The shape of the pressure ring 6 facilitates the full deformation of the side rubber sleeve 3, increasing the contact area between the side rubber sleeve 3 and the inner wall of the sealing cylinder during setting, thus improving the sealing capability. The two right-angle bends on the outer side are chamfered at 45°, which effectively avoids stress concentration caused by overall pressure on the structure, thereby improving the service life of the component.

[0056] The advantages and positive effects of this invention are:

[0057] 1. The present invention has a simple structure, is easy to operate, is suitable for high temperature and high pressure working environment, is not prone to "shoulder protrusion" instability, can achieve a good sealing effect, can be recycled and reused, and has a low setting force.

[0058] 2. The middle rubber cylinder of this invention is made of fluororubber. The middle rubber cylinder plays a major supporting role in the overall structure of the packer, while also inducing full deformation of the middle rubber cylinder. A U-shaped groove is designed in the middle of the middle rubber cylinder, which can induce full deformation of the middle rubber cylinder to obtain higher contact stress and improve the sealing ability of the packer.

[0059] 3. The first shoulder of the present invention is made of polytetrafluoroethylene, which can prevent the middle rubber tube from protruding and flowing outward along the annular space when it is deformed during setting, thereby improving the contact and maintaining the contact stress, and also has the function of preventing the rubber tube from protruding.

[0060] 4. The side rubber tube, side rubber tube support ring, and second shoulder of this invention are integrally vulcanized. The side rubber tube is made of fluororubber, and the side rubber tube support ring is made of alloy steel. This provides support for the side rubber tube. Under high loads, the rubber tube with the support ring is more likely to remain stable, and its stable deformation load is greater. The second shoulder is made of 316 stainless steel, which prevents the side rubber tube from protruding and flowing outward along the annular space during setting deformation, thereby improving contact and maintaining contact stress, and preventing shoulder protrusion of the rubber tube.

[0061] 5. The pressure ring of this invention is made of 42CrMo material and is a rigid component. It can apply axial pressure to the airtight rubber sleeve of the high-temperature and high-pressure packer, causing it to deform laterally, thereby achieving a sealing effect. The shape of the pressure ring facilitates full deformation of the side rubber sleeve, increasing the contact area between the side rubber sleeve and the inner wall of the sealing cylinder during setting, thus improving the sealing capacity. The two right-angle bends on the outer side are chamfered at 45°, which effectively avoids stress concentration caused by overall pressure on the structure, thereby improving the service life of the component.

[0062] The embodiments of the present invention have been described in detail above, but the content described is only a preferred embodiment of the present invention and should not be considered as limiting the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the patent coverage of the present invention.

Claims

1. A high temperature high pressure packer gas tight rubber sleeve, characterized by: The middle rubber cylinder is symmetrically arranged in the up-down direction with the center horizontal plane as the center, the first shoulder is arranged at the upper end and the lower end of the middle rubber cylinder respectively, two groups of the first shoulder are symmetrically distributed with the center horizontal plane as the center, the synthetic side rubber cylinder is arranged outside the two groups of the first shoulder respectively, two groups of the synthetic side rubber cylinder are symmetrically distributed with the center horizontal plane as the center, the pressure ring is arranged outside the two groups of the synthetic side rubber cylinder respectively, two groups of the pressure ring are symmetrically distributed with the center horizontal plane as the center, the synthetic side rubber cylinder comprises a side rubber cylinder, a side rubber cylinder support ring and a second shoulder, the side rubber cylinder, the side rubber cylinder support ring and the second shoulder are integrally vulcanized and formed, the middle rubber cylinder and the side rubber cylinder are made of fluororubber, the first shoulder is made of polytetrafluoroethylene, the second shoulder is made of 316 stainless steel, the middle rubber cylinder is a circular annular columnar body, the top outer edge of the middle rubber cylinder and the bottom outer edge of the middle rubber cylinder are provided with a first chamfer, the horizontal center of the middle rubber cylinder is provided with a first annular groove, the first annular groove is coaxial with the middle rubber cylinder, the cross section of the first annular groove is in the shape of "U", the small circular surface of the side rubber cylinder is provided with a fifth annular groove, the cross section of the fifth annular groove is in the shape of "V", and the side rubber cylinder support ring is arranged in the fifth annular groove.

2. The high temperature and high pressure packer gas tight rubber cup of claim 1, wherein: The first shoulder is a circular truncated columnar body, the large circular surface of the first shoulder is provided with a second annular groove, the cross section of the second annular groove is in the shape of an isosceles trapezoid, the second annular groove is sleeved on the outer column surface of the middle rubber cylinder, the small circular surface of the first shoulder is provided with a third annular groove, the cross section of the third annular groove is in the shape of a rectangle, and the end of the third annular groove is in contact with the synthetic side rubber cylinder.

3. The high temperature and high pressure packer gas tight rubber cup of claim 1 or 2, characterized in that: The side rubber cylinder is a circular truncated columnar body, the large circular surface of the side rubber cylinder is provided with a fourth annular groove, the cross section of the fourth annular groove is in the shape of an isosceles trapezoid, and the fourth annular groove is in contact with the first shoulder.

4. The high temperature and high pressure packer gas tight rubber cup of claim 1 or 2, characterized in that: The second shoulder is a circular annular columnar body, the top outer edge of the second shoulder is provided with a fourth chamfer, the bottom of the second shoulder is provided with a sixth annular groove, the cross section of the sixth annular groove is in the shape of an isosceles trapezoid, the side rubber cylinder is arranged in the sixth annular groove, the top of the second shoulder is provided with a seventh annular groove, the cross section of the seventh annular groove is in the shape of a rectangle, and the pressure ring is arranged in the seventh annular groove.

5. A high temperature and high pressure packer gas tight rubber cup as claimed in claim 4, wherein: The pressure ring is a convex table columnar body, the small column of the pressure ring is arranged in the seventh annular groove, the inner surface of the large column of the pressure ring is provided with an eighth groove, and the cross section of the eighth groove is in the shape of a rectangle.

6. A high temperature and high pressure packer gas tight rubber cup according to claim 5, characterized in that: The large column outer edge of the pressure ring close to the end of the small column of the pressure ring is provided with a fifth chamfer, and the fifth chamfer is 45°.

7. The high temperature and high pressure packer gas tight rubber cup of claims 1 or 2, wherein: The pressure ring is made of 42CrMo material.

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