Rubber sleeve outburst prevention ring in packer

Abstract

The utility model discloses a rubber sleeve outburst prevention ring in a packer, which comprises an annular body and a through hole penetrating through the annular body, and the annular body is provided with a conical surface positioned on one side of the through hole and a first step positioned at the bottom of the conical surface. The annular body is provided with a cylindrical surface located on the other side of the through hole and a second step located at the bottom of the cylindrical surface. A plurality of cutting grooves which are uniformly distributed in the circumferential direction are formed in the annular body, the cutting grooves extend to the second step from the opening end of the conical surface, the annular body is divided into a plurality of rocker arms by the cutting grooves, and the rocker arms can swing relative to the part, corresponding to the cylindrical surface, of the annular body; the problems that after a steel bowl structure is additionally arranged on an existing outburst prevention ring, although the rubber barrel is protected against shearing damage, the outburst prevention ring cannot be evenly opened when the steel bowl is stressed and deformed, acting force generated on the rubber barrel is uneven, and the rubber barrel is difficult to be tightly attached to an outer side pipeline after being deformed are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of packer, especially to a rubber cylinder anti-sudden ring in packer. BACKGROUND

[0002] With the rapid breakthrough of domestic oil and gas well exploitation depth to 8000 meters (such as Tarim Fuman oilfield SHB5-7H well depth of 8520 meters), the working pressure of packer has jumped from 35MPa of conventional well to 105MPa (2023 well completion data statistics of northwest oilfield). Under the working condition of ultra-deep well and ultra-high pressure, 63.7% of the packer failure is directly attributed to the insufficient structural strength of the sealing assembly (China deep oil and gas well completion technology development report P89, 2023), which is specifically manifested as:

[0003] 1. Insufficient yield strength of material

[0004] The application case of Tarim Keshen 902 well (well depth 8036m) shows that when the yield strength of the sealing support ring material is <1100MPa, plastic deformation occurs under 98MPa pressure difference, resulting in the sudden drop of the rubber cylinder contact pressure from 52MPa to 19MPa (lower than the sealing threshold 35MPa), which causes the annulus pressure rate to reach 0.8MPa / h (safety standard <0.07MPa / h); Laboratory comparative test confirms that the use of yield strength 1200MPa 20CrNiMo alloy steel instead of traditional 35CrMo steel (835MPa) can extend the sealing life by 3.2 times (national oil and gas field equipment quality inspection center report NO.2023-CQES-012).

[0005] 2. Design defects of support structure

[0006] The research of Southwest Petroleum University in 2023 (DOI:10.3969 / j.issn.1000-7393.2023.04.011) shows that the traditional rubber cylinder internal steel skeleton has two major shortcomings: the rib plate thickness is only 2-3mm (demand ≥5mm), and the local stress concentration coefficient under non-uniform stress is as high as 4.3 The rib plate spacing is 45mm (optimization value ≤30mm), which causes the contact stress non-uniformity to reach 58%. The above defects directly cause the rubber cylinder tearing of SHB1-23 well in Shunbei oilfield during fracturing operation, and the single well economic loss exceeds 18 million yuan.

[0007] 3. Strength attenuation under dynamic load

[0008] The monitoring data of shale gas wells in Sichuan shows that under the action of 20-75 MPa alternating pressure (frequency 0.5 Hz), the fatigue strength of the traditional support structure decreases by 42% after 10^5 cycles; the crack propagation rate of the sealing assembly reaches 2.8*10^-8 m / cycle (allowable value <1*10^-8 m / cycle) (P61, Prediction Model of Fatigue Life of Shale Gas Fracturing Tool, Southwest Petroleum University, 2023).

[0009] The conventional packers currently used in the art all have the above problems, and the anti-burst ring used in the conventional packer is generally in a C-shaped symmetrical staggered arrangement form, which avoids damaging the rubber tube at the notch by staggered arrangement, but the notch of the C-shaped structure still exists, and the rubber tube may still be damaged by the shearing action of the notch, causing the packer to fail. Later, a steel bowl was added to the above C-shaped structure to prevent the rubber tube from being extruded by the notch, but the addition of the steel bowl caused the anti-burst ring of the C-shaped structure to be unable to adapt to the deformation of the steel bowl and open, which caused the extrusion stroke of the rubber tube to be short and uneven, making it difficult to seal against the outer pipeline wall.

[0010] Therefore, it is necessary to improve the structure of the anti-burst ring to solve the above problems. Content of the utility model

[0011] The utility model aims at providing a rubber tube anti-burst ring in a packer, solving the problem that the existing anti-burst ring cannot uniformly open when the steel bowl is deformed under stress after the addition of the steel bowl structure, which causes uneven force on the rubber tube and makes it difficult for the rubber tube to tightly adhere to the outer pipeline after deformation.

[0012] To achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0013] A rubber tube anti-burst ring in a packer, comprising a ring body and a through hole penetrating through the ring body, wherein a conical surface is arranged on one side of the through hole, and a first step is arranged at the bottom of the conical surface; a cylindrical surface is arranged on the other side of the through hole, and a second step is arranged at the bottom of the cylindrical surface; a plurality of cutting grooves are uniformly distributed along the circumference of the ring body, the cutting grooves extend from the opening end of the conical surface to the second step, and the cutting grooves divide the ring body into a plurality of rocker arms, which can swing relative to the corresponding part of the cylindrical surface on the ring body.

[0014] Preferably, the outer circumferential surface of the ring body comprises a first cylindrical surface and a first conical surface, the first cylindrical surface is located on one side of the opening end of the conical surface, the first conical surface is located on one side of the opening of the cylindrical surface, and the diameter of the first cylindrical surface is the same as the diameter of the bottom circle of the first conical surface.

[0015] Preferably, the width of the first step is smaller than the width of the second step.

[0016] Preferably, the material of the ring body is 20CrNiMo alloy steel.

[0017] Preferably, the steel bowl comprises a deformed side wall abutting the conical surface, an upper end of the deformed side wall is provided with a first limiting side wall, and a lower end of the deformed side wall is provided with a second limiting side wall abutting the first step.

[0018] Preferably, the ring body is an integrally formed structure.

[0019] Preferably, the surface of the first step is provided with a second conical surface inclined towards one side of the through hole.

[0020] Beneficial effects:

[0021] By uniformly distributing a plurality of cutting grooves along the circumference of the ring body, the ring body is divided into a plurality of rocker arms, and the cutting grooves are not penetrated through any position of the ring body, so that the plurality of rocker arms are connected as a whole at one end of the corresponding cylindrical surface, thereby avoiding the generation of a notch structure.

[0022] Meanwhile, the uniformly formed rocker arms can form uniform reaction force when they are opened outward, and the conical surface and the first step realize abutting of the steel bowl, so that the rocker arms can be opened when the steel bowl is deformed, thereby forming uniform force applied to the rubber cylinder, realizing that the rubber cylinder is tightly attached to the outer pipeline after being extruded, and ensuring the sealing effect. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a first perspective three-dimensional structure schematic view of an embodiment of the utility model;

[0024] Figure 2 It is a second perspective three-dimensional structure schematic view of an embodiment of the utility model;

[0025] Figure 3 It is a sectional structure schematic view of an embodiment of the utility model;

[0026] Figure 4 It is a structure schematic view of an embodiment of the utility model cooperating with the steel bowl;

[0027] In Figures 1 to 4 In the drawings, the correspondence between the component names or lines and the drawing numbers is as follows:

[0028] Ring body 1, through hole 2, conical surface 3, first step 4, cylindrical surface 5, second step 6, cutting groove 7, rocker arm 8, first cylindrical surface 9, first conical surface 10, steel bowl 11, deformed side wall 111, first limiting side wall 112, second limiting side wall 113, second conical surface 12. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the utility model will be apparently and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments.

[0030] Referring to Figures 1-4 The utility model discloses an embodiment provides a rubber cylinder anti-surge ring in packer, for installing to packer and supporting and evenly extruding rubber cylinder. Specifically includes annular body 1 and the through -hole 2 of passing through annular body 1, the through -hole 2 size is used for inserting to the center tube of packer, be equipped with on the annular body 1 conical surface 3 located one side of through -hole 2 and first step 4 located the bottom of conical surface 3, be equipped with on the annular body 1 cylindrical surface 5 located the other side of through -hole 2 and second step 6 located the bottom of cylindrical surface 5, through conical surface 3 and first step 4 realize the fitting of steel bowl 11, to guarantee that steel bowl 11 can fit conical surface 3 and deform after being extruded by rubber cylinder, and first step 4 forms the limit to the minimum bottom of steel bowl 11 deformation, cylindrical surface 5 and second step 6 are used for the limit structure of inserting in center tube cooperation and positioning.

[0031] Be equipped with on the annular body 1 several cutting grooves 7 along the circumferential uniform distribution, the cutting groove 7 from the opening end of conical surface 3 extends to the second step 6, the cutting groove 7 divides the annular body 1 into several rocker arms 8, the rocker arm 8 can swing relative to the part of corresponding cylindrical surface 5 on annular body 1;Cutting groove 7 is processed to second step 6, namely stop, so that the entire annular body 1 is still complete in the position corresponding to cylindrical surface 5, will not produce notched structure, and realize that several rocker arms 8 that are uniformly divided can swing deformation relative to the complete part, guarantee the opening action uniformity of rocker arm 8, to guarantee that the reaction force that rubber cylinder receives is uniform, can be uniformly convex when being extruded and tightly attached to the external pipeline to realize good sealing.

[0032] Specifically, in order to ensure that the rocker arm 8 can be stably opened outward, reduce the resistance of the swing point, the outer peripheral surface of the annular body 1 comprises a first cylindrical surface 9 and a first conical surface 10, the first cylindrical surface 9 is located on one side of the opening end of the conical surface 3, the first conical surface 10 is located on one side of the opening of the cylindrical surface 5, the diameter of the first cylindrical surface 9 is the same as the diameter of the bottom circle of the first conical surface 10, and the strength of the swing point is reduced by using the first conical surface 10, which is beneficial to the opening of the rocker arm 8.

[0033] Meanwhile, the width of the first step 4 is smaller than the width of the second step 6, the first step 4 is used for positioning the steel bowl 11, and the second step 6 is used for realizing a sealing fit and positioning, the first step 4 and the second step 6 have the same hole diameter as the through hole 2, and a second taper surface 12 inclined to the side of the through hole 2 is arranged on the surface of the first step 4, and the second taper surface 12 is used for positioning the steel bowl 11.

[0034] In order to ensure the structural stability and yield strength of the whole annular body 1 and prolong the service life, the material of the annular body 1 is 20CrNiMo alloy steel.

[0035] Specifically, in order to ensure the structural strength of the whole anti-popping ring, the annular body 1 is in an integral forming structure, and can be formed by machining or pre-forging and then machining, so as to mainly ensure the structural strength of the whole structure.

[0036] The steel bowl 11 is also used in cooperation with the rubber tube anti-popping ring, and the steel bowl 11 comprises a deformed side wall 111 abutting against the conical surface 3, the upper end of the deformed side wall 111 is provided with a first limiting side wall 112, the lower end of the deformed side wall 111 is provided with a second limiting side wall 113, and the second limiting side wall 113 abuts against the first step 4; the deformed side wall 111 is used for abutting against the swing arm 8 to be opened and deformed synchronously when the deformation of the rubber tube is maintained, so as to ensure that the reaction force can be uniformly applied to the rubber tube, the second limiting side wall 113 is positioned on the second taper surface 12, and the first limiting side wall 112 is used for forming a circumferential limiting for the rubber tube.

[0037] In the present application, unless otherwise clearly specified and limited, the terms such as "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or can be integrated; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the communication inside two elements or the interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0038] In the description of the present application, it should be pointed out that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship commonly used when the product of the present application is used, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second" and the like are only used for differentiation, and cannot be understood as indicating or implying relative importance.

[0039] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A rubber sleeve anti-surge ring in a packer, characterized in that: It includes an annular body (1) and a through hole (2) through the annular body (1). The annular body (1) is provided with a conical surface (3) on one side of the through hole (2) and a first step (4) at the bottom of the conical surface (3). The annular body (1) is provided with a cylindrical surface (5) on the other side of the through hole (2) and a second step (6) at the bottom of the cylindrical surface (5). The annular body (1) is provided with a plurality of cutting grooves (7) evenly distributed along the circumference. The cutting grooves (7) extend from the opening end of the conical surface (3) to the second step (6). The cutting grooves (7) divide the annular body (1) into a plurality of rocker arms (8). The rocker arms (8) can swing relative to the part of the annular body (1) corresponding to the cylindrical surface (5).

2. The rubber sleeve anti-protrusion ring in a packer according to claim 1, characterized in that: The outer peripheral surface of the annular body (1) includes a first cylindrical surface (9) and a first conical surface (10). The first cylindrical surface (9) is located on one side of the opening end of the conical surface (3), and the first conical surface (10) is located on one side of the opening of the cylindrical surface (5). The diameter of the first cylindrical surface (9) is the same as the diameter of the bottom circle of the first conical surface (10).

3. The rubber sleeve anti-protrusion ring in a packer according to claim 2, characterized in that: The width of the first step (4) is smaller than the width of the second step (6).

4. The rubber sleeve anti-surge ring in a packer according to any one of claims 1-3, characterized in that: The material of the annular body (1) is 20CrNiMo alloy steel.

5. The rubber sleeve anti-protrusion ring in a packer according to claim 4, characterized in that: The steel bowl (11) includes a deformable sidewall (111) that fits against the conical surface (3). The upper end of the deformable sidewall (111) is provided with a first limiting sidewall (112), and the lower end of the deformable sidewall (111) is provided with a second limiting sidewall (113). The second limiting sidewall (113) fits against the first step (4).

6. The rubber sleeve anti-surge ring in a packer according to claim 4, characterized in that: The ring-shaped body (1) is a one-piece molded structure.

7. The rubber sleeve anti-protrusion ring in a packer according to claim 6, characterized in that: The surface of the first step (4) is provided with a second conical surface (12) that is inclined toward the through hole (2).

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