Ultrahigh-pressure combined air-tight seal rubber sleeve

Abstract

The invention discloses an ultrahigh-pressure combined air-tight seal rubber sleeve which comprises a middle rubber sleeve, two metal spacer rings and two end rubber sleeves, and the two sides of the middle rubber sleeve are sequentially connected with one metal spacer ring and one end rubber sleeve in an abutting mode respectively. The combined sealing rubber sleeve further comprises rubber sleeve shoulder pads, the rubber sleeve shoulder pads are arranged on the two end rubber sleeves in a wrapping mode, and meanwhile the rubber sleeve shoulder pads are located on the sides, away from the metal spacer rings, of the end rubber sleeves. Wherein the two symmetrically arranged metal spacer rings are parallel relative to the compression direction of the middle rubber sleeve; the wrapping direction of the rubber cylinder shoulder pad faces the middle rubber cylinder, the rubber cylinder shoulder pad is made of flexible metal and has extremely high ductility, and meanwhile the rubber cylinder shoulder pad is provided with a structural weak area in the circumferential direction. According to the ultrahigh-pressure combined gas seal rubber sleeve, the sealing performance can be effectively improved, the risk of sealing failure of a packer applying the ultrahigh-pressure combined gas seal rubber sleeve is reduced, and a powerful guarantee is provided for efficient exploration and development of ultra-deep oil and gas reservoirs.

Description

Technical Field

[0001] The invention belongs to the technical field of oil and gas wells, and in particular relates to an ultra-high pressure combined gas sealing rubber cylinder. Background Art

[0002] The packer is a downhole tool with elastic sealing elements, which can be used to seal the annular space between pipes of various sizes and the wellbore, as well as between pipes, and isolate the production layer to control the production (injection) fluid and protect the casing. With the gradual reduction of easily recoverable oil and gas resources and the gradual increase in the global economic demand for oil and gas resources, drilling activities are constantly shifting to high-risk and extremely challenging drilling environments such as complex geological areas, deep water, and extremely high temperature and pressure.

[0003] The existing rubber cartridge structures in China can be roughly divided into the following categories:

[0004] 1. The stack of pure rubber is supplemented with a steel spacer ring in the middle to prevent the seal from being skewed. Pure rubber has very low tear resistance under high temperature and high pressure. This design does not have any protective structure at both ends of the rubber cylinder, which will cause extrusion and tearing. The rubber cylinder cannot withstand high temperature and high pressure;

[0005] 2. The stack of vulcanized spring rubber is supplemented with a steel spacer ring in the middle to prevent the seal from deflecting. The original intention of the vulcanized spring rubber is to provide support for the rubber barrel through the spring, but in many cases, due to different spring designs, the tear resistance of pure rubber is very low under high temperature and high pressure. Under high temperature and high pressure, the spring will cut the rubber barrel, causing stress concentration, forming a pressure relief channel, and poor stability;

[0006] 3. Metal mesh + rubber ring + rubber intermediate rubber tube, the rubber inside and outside are vulcanized together. The rubber tube has good shear resistance and stability, but it is subject to the metal mesh molding process. The metal mesh is easy to creep, extrude, flip and shear under high temperature and high pressure, causing loss of sealing;

[0007] 4. In the form of metal mesh + PTFE ring + rubber intermediate rubber tube, in order to enhance the sealing of the metal mesh rubber tube, PTFE material as a filling material between the metal mesh and the rubber can prevent the middle rubber from being squeezed out, which is a good choice. The rubber tube has better shear resistance, stability and sealing. However, due to the metal mesh molding process, the metal mesh is prone to creeping extrusion, flipping and shearing under high temperature and high pressure, resulting in loss of sealing.

[0008] Packers are divided into permanent packers and retrievable packers. Retrievable packers are packers that can be unsealed by lifting, cutting and special tools, and the packers can be recovered from the bottom of the well to the ground. Compared with permanent packers, retrievable packers save grinding time and are easy to use. They are especially common in China.

[0009] If the metal bowl support ring is located on the right side of the rubber cartridge assembly, during the recovery of the retrievable packer, the metal bowl support ring on the right side is prone to encounter resistance and deformation during the lifting process, thus flipping over and getting stuck in the well, making it impossible to recover normally. The metal mesh rubber cartridge does not have this risk of getting stuck in the well during recovery, but its flexible characteristics cannot meet the stringent design requirements such as high temperature and high pressure API 11D1 V0 gas sealing.

[0010] With the deepening of exploration and development of ultra-deep oil and gas reservoirs in the Tarim Basin, the temperature and pressure resistance of the commonly used combined rubber cylinders at this stage are both 204℃ / 70MPa, and they do not have the properties of hydrogen sulfide resistance, which to a certain extent restricts the smooth implementation of completion operations of ultra-deep oil and gas wells with high gasoline ratios. Summary of the invention

[0011] The technical problem to be solved by the present invention is to provide an ultra-high pressure combined air-sealing rubber cylinder in response to the above-mentioned deficiencies in the prior art, and to upgrade the commonly used combined rubber cylinder with a temperature and pressure resistance of 204°C / 70MPa to an ultra-high pressure combined air-sealing rubber cylinder with a temperature and pressure resistance of 232°C / 105MPa, so as to solve the technical problem that the commonly used combined rubber cylinders have a temperature and pressure resistance of 204°C / 70Mpa and cannot meet the requirements for high-pressure oil and gas well completion.

[0012] The present invention adopts the following technical solutions:

[0013] An ultra-high pressure combined airtight sealing rubber cylinder comprises a middle rubber cylinder, two sides of the middle rubber cylinder are respectively provided with metal spacer rings and end rubber cylinders, and the end rubber cylinders are respectively covered with rubber cylinder shoulder guards, and the rubber cylinder shoulder guards are located on a side away from the metal spacer ring;

[0014] The metal spacer ring is arranged parallel to the compression direction of the middle rubber cylinder, and the covering direction of the rubber cylinder shoulder faces the middle rubber cylinder.

[0015] Specifically, the thickness of the rubber sleeve shoulder guard is 0.5 to 2 mm.

[0016] Specifically, a structural weak area is arranged on the circumferential direction of the rubber tube shoulder guard, and a covering surface with two sets of inclined angles is arranged on the inner side surface of the rubber tube shoulder guard, and the covering surface is abutted and connected with the end rubber tube.

[0017] Furthermore, the inclination angle of the covering surface ranges from 5 to 35 degrees.

[0018] Specifically, a special metal mesh structure is provided inside the end rubber cylinder, an outer contact surface is provided on one side of the outside of the end rubber cylinder, and an inner contact surface is provided on the other side accordingly, the outer contact surface is abutted and connected with the inner side surface of the rubber cylinder shoulder; the inner contact surface is abutted and connected with the outer side of the metal spacer ring.

[0019] Specifically, the contact surface between the end rubber sleeve and the metal spacer ring forms an inverted L-shaped contact surface.

[0020] Furthermore, a first outer annular surface is arranged outside the metal spacer ring, and a first contact surface, a second contact surface and a third contact surface are arranged in sequence outside the first outer annular surface along the axial direction; the end rubber sleeve is abutted and connected with the first contact surface, the second contact surface and the third contact surface.

[0021] Specifically, the contact surface of the middle rubber cylinder and the metal spacer ring forms a composite contact surface.

[0022] Furthermore, a fourth contact surface and a fifth contact surface are sequentially arranged on the inner side of the first outer annular surface along the axial direction, and the middle rubber sleeve is abutted and connected with the fourth contact surface and the fifth contact surface.

[0023] Specifically, a metal ring is arranged inside the middle rubber cylinder.

[0024] Compared with the prior art, the present invention has at least the following beneficial effects:

[0025] The invention discloses an ultra-high-pressure combined air-sealing rubber cylinder. The two end rubber cylinders and two rubber cylinder shoulder guards can ensure the deformation of the middle rubber cylinder at 232°C to achieve full sealing of the middle rubber cylinder. The two metal spacer rings can ensure that the middle rubber cylinder is not damaged when the tool is lowered to the bottom of the well. Through the middle rubber cylinder, two metal spacer rings, two end rubber cylinders and two rubber cylinder shoulder guards, the device can meet the high-temperature and high-pressure sealing requirements of 232°C / 105MPa.

[0026] Furthermore, the thickness of the rubber tube shoulder guard is 0.5 to 2 mm, which can ensure that the rubber tube shoulder guard is fully opened to achieve the effect of protecting the end rubber tube.

[0027] Furthermore, the inclination angle of the covering surface ranges from 5 to 35 degrees, and the rubber tube shoulder guard can be connected with the end rubber tube in abutting manner, while ensuring that the rubber tube shoulder guard is fully opened, thereby achieving the effect of protecting the end rubber tube.

[0028] Furthermore, the end rubber cylinder can not only fully open the seal, but also have a certain degree of anti-fluidity under the action of the metal mesh, thereby achieving the effect of auxiliary sealing and protecting the middle rubber cylinder.

[0029] Furthermore, the contact surface between the end rubber sleeve and the metal spacer ring forms an inverted L-shaped contact surface; the end rubber sleeve and the metal spacer ring are in contact connection, thereby achieving the effect of fixing the end rubber sleeve.

[0030] Furthermore, the middle rubber cylinder is connected with the metal spacer ring in abutting manner, thereby increasing the force-bearing area of ​​the middle rubber cylinder and achieving the effect of ensuring that the middle rubber cylinder is fully expanded and sealed.

[0031] Furthermore, a metal ring is arranged inside the middle rubber cylinder, and the middle rubber cylinder is in contact connection with the metal spacer ring, so as to ensure that the middle rubber cylinder does not have axial and circumferential flow under high temperature.

[0032] In summary, the performance of the ultra-high pressure combined air-sealing rubber cylinder of the present invention can reach 232°C / 105MPa, which can effectively ensure the success rate of completion operations of ultra-deep oil and gas wells with high gasoline ratio, reduce potential well control risks, and provide strong guarantee for the efficient exploration and development of ultra-deep oil and gas reservoirs.

[0033] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the structure of the present invention;

[0035] Figure 2 It is a stereogram of the present invention;

[0036] Figure 3 This is a schematic diagram of the rubber sleeve shoulder guard structure of the present invention;

[0037] Figure 4 This is a schematic diagram of the end rubber cylinder structure of the present invention;

[0038] Figure 5 This is a schematic diagram of the metal spacer ring structure of the present invention;

[0039] Figure 6 It is a schematic diagram of the structure of the intermediate rubber cylinder of the present invention.

[0040] Among them: 2. Rubber sleeve shoulder guard; 201. Structural weak area; 202. Covering surface; 3. End rubber sleeve; 301. External contact surface; 302. Internal contact surface; 4. Metal spacer ring; 401. First outer annular surface; 402. First contact surface; 403. Second contact surface; 404. Third contact surface; 405. Fourth contact surface; 406. Fifth contact surface; 5. Middle rubber sleeve; 501. Metal ring. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "one side", "one end", "one side" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0043] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0045] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0046] It should be further understood that the term "and / or" used in the present description and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0047] Various structural schematic diagrams of the embodiments disclosed in the present invention are shown in the accompanying drawings. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0048] The present invention provides an ultra-high pressure combined airtight sealing rubber cylinder, wherein a metal spacer ring and an end rubber cylinder are respectively abutted on both sides of a middle rubber cylinder; rubber cylinder shoulder guards are coated on the two end rubber cylinders, and the rubber cylinder shoulder guards are located on the side of the end rubber cylinder away from the metal spacer rings; the two symmetrically arranged metal spacer rings are parallel to the compression direction of the middle rubber cylinder; the coating direction of the rubber cylinder shoulder guards faces the middle rubber cylinder, and the rubber cylinder shoulder guards are made of flexible metal with extremely strong ductility, and at the same time, there is a structural weak area on the circumferential edge of the rubber cylinder shoulder guards; the present invention can effectively improve the sealing performance, reduce the risk of sealing failure of the packer using the rubber cylinder shoulder guard, and provide a strong guarantee for the efficient exploration and development of ultra-deep oil and gas reservoirs.

[0049] See also Figure 1 and Figure 2 The present invention discloses an ultra-high pressure combined airtight sealing rubber cylinder, comprising two end rubber cylinders 3, two metal spacer rings 4 and a middle rubber cylinder 5.

[0050] The two sides of the middle rubber cylinder 5 are respectively and sequentially connected to a metal spacer ring 4 and an end rubber cylinder 3; the two end rubber cylinders 3 are respectively covered with rubber cylinder shoulder guards 2, and at the same time, the rubber cylinder shoulder guards 2 are located on the side of the end rubber cylinder 3 away from the metal spacer ring 4.

[0051] Among them, the two symmetrically arranged metal spacer rings 4 are parallel to the compression direction of the middle rubber cylinder 5; the covering direction of the rubber cylinder shoulder guard 2 faces the middle rubber cylinder 5, the rubber cylinder shoulder guard 2 is made of flexible metal with extremely strong ductility, and a structural weak area 201 is circumferentially arranged on the rubber cylinder shoulder guard 2.

[0052] In the above solution, the thickness of the rubber sleeve shoulder guard 2 is 0.5-2 mm.

[0053] See also Figure 3 The inner side surface of the rubber sleeve shoulder guard 2 and the outer side surface of the end rubber sleeve 3 are provided with covering surfaces 202 with two sets of inclination angles, and the inclination angle range of the covering surfaces 202 with inclination angles is 5 to 35 degrees.

[0054] The covering surface 202 is in abutment connection with the end rubber sleeve 3 .

[0055] See also Figure 4A special metal mesh structure is arranged inside the end rubber cylinder 3, and an outer contact surface 301 and an inner contact surface 302 are arranged outside the end rubber cylinder 3; the outer contact surface 301 is abutted and connected with the covering surface 202; the inner contact surface 302 is abutted and connected with the fourth contact surface 405 and the fifth contact surface 406.

[0056] See also Figure 6 A metal ring 501 is provided inside the middle rubber tube 5; during the drilling process, the filling of the metal ring 501 can ensure that the middle rubber tube 5 does not expand inwardly in the circumferential direction under high temperature.

[0057] See also Figure 5 A first outer annular surface 401 is provided on the outside of the metal spacer ring 4, and the first outer annular surface is connected to a first contact surface 402, a second contact surface 403, a third contact surface 404, a fourth contact surface 405 and a fifth contact surface 406 on both sides thereof along the axial direction.

[0058] The end rubber sleeve 3 is in abutment with the first contact surface 402 , the second contact surface 403 and the third contact surface 404 , and the middle rubber sleeve 5 is in abutment with the fourth contact surface 405 and the fifth contact surface 406 .

[0059] In the above scheme, the end rubber cylinder 3 is in contact with the first contact surface 402, the second contact surface 403, and the third contact surface 404, so that the contact surface of the end rubber cylinder 3 and the metal spacer ring 4 forms an inverse "L"-shaped contact surface. During the setting process, the additional radial force generated by the metal spacer ring 4 on the end rubber cylinder 3 can be directly applied to the rubber cylinder shoulder guard 2 through step-by-step transmission, thereby promoting the circumferential deformation of the rubber cylinder shoulder guard 2.

[0060] In the above solution, the middle rubber tube 5 abuts against the fourth contact surface 405 and the fifth contact surface 406 , so that the contact surface of the middle rubber tube 5 and the metal spacer ring 4 forms a composite contact surface.

[0061] During the setting process, the radial force exerted by the metal spacer ring 4 on the intermediate rubber cylinder 5 can fully complete the circumferential deformation of the intermediate rubber cylinder 5 , and the arc-shaped fourth contact surface 405 can limit the radial deformation of the intermediate rubber cylinder 5 .

[0062] In the above solution, the material of the rubber sleeve shoulder guard 2 can be flexible metal.

[0063] Preferably, the material of the rubber sleeve shoulder guard 2 is one of red copper, copper alloy, aluminum alloy and the like.

[0064] The material of the metal spacer ring 4 is alloy steel.

[0065] The working process and principle of the ultra-high pressure combined air-sealing rubber cylinder of the present invention are as follows:

[0066] During the completion operation of ultra-deep oil and gas wells, the completion packer piston is pushed by the tubing pressure to axially squeeze the ultra-high pressure combined air-sealing rubber cylinder, so that the rubber cylinder completes circumferential expansion until it is sealed into the oil and gas well wall.

[0067] The ultra-high pressure combined airtight seal rubber cylinder of the present invention has the following characteristics:

[0068] During the completion of ultra-deep oil and gas wells, an ultra-high pressure combined air-tight rubber seal of the present invention is provided with a rubber seal shoulder 2, and a structural weak area 201 is formed on the rubber seal shoulder 2; thus, under the action of a relatively smaller axial sealing load, the structural weak area 201 can be deformed to allow the combined sealing rubber seal 1 to be seated, thereby completing the sealing of the rubber seal, thereby effectively improving the pressure-bearing performance of the combined air-tight rubber seal 1, and being able to withstand a higher sealing pressure difference. At the same time, a metal ring 501 is provided in the middle rubber seal 5 to fill it, so that under high temperature conditions, the inner circumferential expansion of the rubber seal is effectively reduced, and the risk of premature expansion and sealing of the rubber seal is reduced.

[0069] In summary, the ultra-high pressure combined air-sealing rubber cylinder of the present invention has a performance of up to 232°C / 105MPa, which can effectively ensure the success rate of completion operations of ultra-deep oil and gas wells with high gasoline ratio, reduce potential well control risks, and provide strong guarantee for the efficient exploration and development of ultra-deep oil and gas reservoirs.

[0070] The above contents are only for explaining the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. An ultra-high pressure combined air-sealing rubber cylinder, characterized in that: It comprises a middle rubber cylinder (5), the two sides of which are respectively provided with metal spacer rings (4) and end rubber cylinders (3), and the end rubber cylinders (3) are respectively covered with rubber cylinder shoulder guards (2), and the rubber cylinder shoulder guards (2) are located on a side away from the metal spacer ring (4); The metal spacer ring (4) is arranged parallel to the compression direction of the middle rubber cylinder (5), and the covering direction of the rubber cylinder shoulder guard (2) faces the middle rubber cylinder (5).

2. The ultra-high pressure combined airtight sealant cartridge according to claim 1, characterized in that: The thickness of the rubber sleeve shoulder guard (2) is 0.5-2 mm.

3. The ultra-high pressure combined airtight sealant cartridge according to claim 1, characterized in that: A structural weak area (201) is provided on the circumferential edge of the rubber sleeve shoulder guard (2), and a covering surface (202) having two sets of inclined angles is provided on the inner side surface of the rubber sleeve shoulder guard (2), and the covering surface (202) is abutted and connected with the end rubber sleeve (3).

4. The ultra-high pressure combined airtight sealant cartridge according to claim 3, characterized in that: The inclination angle of the covering surface (202) ranges from 5 to 35 degrees.

5. The ultra-high pressure combined air-sealing rubber cylinder according to claim 1, characterized in that: A special metal mesh structure is provided inside the end rubber sleeve (3); an outer contact surface (301) is provided on one side of the outside of the end rubber sleeve (3), and an inner contact surface (302) is provided on the other side; the outer contact surface (301) is abutted and connected with the inner side surface of the rubber sleeve shoulder guard (2); and the inner contact surface (302) is abutted and connected with the outer side of the metal spacer ring (4).

6. The ultra-high pressure combined airtight sealant cartridge according to claim 1, characterized in that: The contact surface between the end rubber sleeve (3) and the metal spacer ring (4) forms an inverted L-shaped contact surface.

7. The ultra-high pressure combined airtight sealant cartridge according to claim 6, characterized in that: A first outer annular surface (401) is arranged on the outside of the metal spacer ring (4), and a first contact surface (402), a second contact surface (403) and a third contact surface (404) are arranged on the outside of the first outer annular surface (401) in sequence along the axial direction; the end rubber sleeve (3) is abutted and connected with the first contact surface (402), the second contact surface (403) and the third contact surface (404).

8. The ultra-high pressure combined airtight sealant cartridge according to claim 1, characterized in that: The contact surface of the middle rubber cylinder (5) and the metal spacer ring (4) forms a composite contact surface.

9. The ultra-high pressure combined air-sealing rubber cylinder according to claim 8, characterized in that: A fourth contact surface (405) and a fifth contact surface (406) are sequentially arranged on the inner side of the first outer annular surface (401) along the axial direction, and the middle rubber sleeve (5) is abutted and connected with the fourth contact surface (405) and the fifth contact surface (406).

10. The ultra-high pressure combined airtight sealant cartridge according to claim 1, characterized in that: A metal ring (501) is arranged inside the middle rubber cylinder (5).

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