An integrated ring for cementing

Abstract

This utility model belongs to the field of oil and gas drilling technology, and discloses an integrated ring plate for cementing with simple structure, good sealing performance, and convenient installation. It includes: a sealing sleeve and an integrated ring plate body; the sealing sleeve is annular, with annular second sealing groove and first sealing groove respectively provided on its inner and outer side walls, and a second sealing ring and a first sealing ring respectively provided in the second and first sealing grooves; the sealing sleeve is used to fit onto the surface casing, and the second sealing ring is located between the sealing sleeve and the surface casing; the integrated ring plate body has an axially penetrating central channel, and an inner mounting shoulder is provided at the upper part of the central channel; the sealing sleeve is embedded in the central channel and its lower end face is sealed to the inner mounting shoulder, and the first sealing ring is located between the sealing sleeve and the integrated ring plate body; a return fluid interface is provided on the outer side wall of the integrated ring plate body; the lower end of the integrated ring plate body is used for sealing insertion into the water guide casing.

Description

Technical Field

[0001] This utility model relates to the field of oil and gas drilling technology, specifically to an integrated ring plate for cementing. Background Technology

[0002] Cementing is a crucial step in offshore or onshore oil and gas well drilling, aiming to isolate the formation, support the wellbore structure, and ensure safe subsequent operations. Annular plates, as key connecting components in cementing operations, are primarily used to connect the riser to the surface casing, forming the basic seal and pressure barrier of the wellhead assembly.

[0003] Currently, traditional ring plates widely used both domestically and internationally typically employ a split structure, consisting of two semi-circular rings connected by multiple high-strength bolts. While this structure facilitates on-site installation, it suffers from several inherent drawbacks: 1) Poor sealing performance: Gaps exist between the mating surfaces, and even with sealing materials, leakage of drilling fluid or cement slurry is highly likely under high-temperature, high-pressure, and vibration conditions downhole, posing safety and environmental risks; 2) Low structural reliability: Bolted connections may loosen or fatigue fracture under long-term alternating loads, leading to ring plate structural failure; 3) Cumbersome installation process: Installation requires aligning the two semi-rings and tightening numerous bolts, resulting in low work efficiency and demanding high operator skills; 4) Limited functionality: Traditional ring plates typically lack additional fluid interfaces. For example, if cementing fluid return or pressure monitoring is required, a separate hole must be drilled in the riser, which not only weakens the riser structure but also increases the risk of drilling deck contamination.

[0004] Therefore, given the aforementioned problems with existing technologies, there is an urgent need for a new type of ring plate structure that can fundamentally improve sealing performance, simplify installation procedures, enhance structural integrity, and integrate multiple functions to meet the increasingly stringent requirements of modern drilling operations for safety, efficiency, and environmental protection. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model proposes an integrated ring plate for cementing that features a simple structure, good sealing performance, and convenient installation.

[0006] The integrated annular plate for cementing according to this utility model includes: a sealing sleeve and an integrated annular plate body; the sealing sleeve is annular, with annular second sealing groove and first sealing groove respectively provided on its inner and outer side walls, and a second sealing ring and a first sealing ring respectively provided in the second sealing groove and the first sealing groove; the sealing sleeve is used to fit onto the surface casing, and the second sealing ring is located between the sealing sleeve and the surface casing; the integrated annular plate body is provided with an axially penetrating central channel, and an inner mounting shoulder is provided at the upper part of the central channel; the sealing sleeve is embedded in the central channel and its lower end face is sealed to the inner mounting shoulder, and the first sealing ring is located between the sealing sleeve and the integrated annular plate body; a return fluid interface is provided on the outer side wall of the integrated annular plate body; the lower end of the integrated annular plate body is used to seal and insert into the water guide casing.

[0007] Furthermore, the inner mounting shoulder is formed as an inner conical surface, and the sealing sleeve includes an equal-diameter section away from the integral ring plate body and an inner conical section connected to the equal-diameter section and close to the integral ring plate body. The inner conical section is formed with an outer conical surface that matches the inner conical surface, and the first sealing ring is disposed on the equal-diameter section.

[0008] Furthermore, there are multiple return interfaces, which are evenly spaced along the same circumference of the outer wall of the integrated ring plate body.

[0009] Furthermore, an outer sealing groove is provided on the outer side of the integrated ring plate body, and an outer sealing ring is provided in the outer sealing groove. The lower end of the integrated ring plate body is inserted into the water guide sleeve, and the outer sealing ring is located between the two.

[0010] Furthermore, the first sealing ring, the second sealing ring, and the outer sealing ring are all O-rings.

[0011] Furthermore, a wellhead connector is also provided at the upper end of the integrated ring plate body.

[0012] Furthermore, the sealing sleeve and the surface sleeve are interference fit.

[0013] Furthermore, the sealing sleeve is prefabricated on the surface sleeve.

[0014] Furthermore, both the integrated ring plate body and the sealing sleeve are made of high-strength alloy steel.

[0015] Furthermore, a nitrided layer or a hard chrome layer is formed on the outer surface of the sealing sleeve.

[0016] Compared to traditional two-piece bolted ring plates, this utility model's integrated ring plate for cementing employs a single forged ring plate body, a prefabricated sealing sleeve, and a triple sealing structure of conical O-rings. This completely eliminates problems such as longitudinal joint leakage, bolt loosening and failure, and weakening of the water-proof guide tube by opening, greatly improving the sealing reliability and safety under high pressure and vibration conditions. The design of the return fluid interface not only avoids opening holes in the critical load-bearing component, the water guide sleeve, protecting its structural strength, but also enables functions such as deck cleaning operations, significantly improving the efficiency, environmental friendliness, and safety of cementing operations. The prefabricated-plug installation method also greatly shortens offshore operation time and reduces labor costs. High-strength alloy steel and surface hardening treatment greatly improve fatigue life, making it suitable for harsh conditions such as deep water, high temperature and high pressure, and high corrosion. Attached Figure Description

[0017] Figure 1 This is a structural schematic diagram of an integrated ring plate for cementing according to an embodiment of the present invention. Detailed Implementation

[0018] To better understand the purpose, structure, and function of this utility model, a more detailed description of this utility model is provided below with reference to the accompanying drawings.

[0019] Figure 1 The structure of an integral ring plate 100 for cementing according to an embodiment of the present invention is shown. For example... Figure 1 As shown, the integrated annular plate 100 for cementing may include: a sealing sleeve 1 and an integrated annular plate body 6; the sealing sleeve 1 is annular, with annular second sealing groove and first sealing groove respectively provided on its inner and outer side walls, and a second sealing ring 5 and a first sealing ring 2 respectively provided in the second sealing groove and the first sealing groove; the sealing sleeve 1 is used to fit onto the surface casing 3, and the second sealing ring 5 is located between the sealing sleeve 1 and the surface casing 3; the integrated annular plate body 6 is provided with an axially penetrating central channel 61, and an inner mounting shoulder 62 is provided at the upper part of the central channel 61; the sealing sleeve 1 is embedded in the central channel 61 and its lower end face is sealed to the inner mounting shoulder 62, and the first sealing ring 2 is located between the sealing sleeve 1 and the integrated annular plate body 6; a return fluid interface 7 is provided on the outer side wall of the integrated annular plate body 6; the lower end of the integrated annular plate body 6 is used to seal the insertion into the water guide casing (not shown in the figure).

[0020] In this embodiment of the utility model, the integrated annular plate 100 for cementing operates by first fitting the sealing sleeve 1 onto the surface casing 3, with the second sealing ring 5 providing an initial seal between them. Subsequently, the surface casing 3, carrying the sealing sleeve 1, is lowered into the well. The integrated annular plate body 6 is fixed to the platform wellhead. The surface casing 3 is then lowered so that the sealing sleeve 1 enters the central channel 61 of the integrated annular plate body 6 and reaches the inner mounting shoulder 62. The sealing sleeve 1 abuts against the inner mounting shoulder 62 to create a seal. Simultaneously, the second sealing ring 5 and the first sealing ring 2 respectively achieve simultaneous sealing between the sealing sleeve 1 and the surface casing 3 and the integrated annular plate body 6. The water guide casing is fitted into the lower end of the integrated annular plate body 6 to form an external seal. During cementing operations, cement slurry is evenly returned from the return interface 7.

[0021] The integrated ring plate 100 for cementing in this embodiment of the invention fundamentally eliminates the leakage risk of the traditional two-part ring plate mating surface through the integrated ring plate body 6. Furthermore, through the cooperation of the sealing sleeve 1 with the first sealing ring 2 and the second sealing ring 5, a double sealing barrier is established between the integrated ring plate body 6 and the surface casing 3, significantly improving the overall sealing reliability. The integrated return fluid interface 7 avoids opening holes in the water guide pipe, protecting its structural integrity.

[0022] In such Figure 1 In the preferred embodiment shown, the inner mounting shoulder 62 is formed as an inner conical surface. The sealing sleeve 1 may include a constant-diameter section away from the integral ring plate body 6 and an inner conical section connected to and close to the integral ring plate body 6. The inner conical section forms an outer conical surface 4 that matches the inner conical surface. The first sealing ring 2 is disposed on the constant-diameter section. In this embodiment, through the cooperation of the inner conical surface and the outer conical surface 4, automatic centering and guidance can be achieved during installation, ensuring that the sealing sleeve 1 and the integral ring plate body 6 are quickly and accurately positioned. At the same time, the conical surface pressing can further enhance the sealing effect. During the insertion of the integrated ring plate body 6, the cooperation of the inner conical surface and the outer conical surface 4 compresses the first sealing ring 2. Ultimately, the weight of the integrated ring plate body 6 and the outer sealing ring between it and the water guide casing form a seal, connecting the surface casing 3, the integrated ring plate body 6, and the water guide casing into a continuous, multi-layered sealed pressure enclosure. During cementing operations, the pressure inside the wellbore is effectively isolated by this sealing system, while the returned fluid is safely discharged through the return fluid interface 7 on the integrated ring plate body 6.

[0023] In such Figure 1 In the preferred embodiment shown, the number of return fluid interfaces 7 can be multiple (preferably four), and they are preferably evenly arranged at the same circumferential intervals along the outer wall of the integrated annular plate body 6. By setting multiple evenly distributed return fluid interfaces 7, redundancy is provided to prevent blockage of a single return fluid interface 7; at the same time, the uniform arrangement can ensure the stability of the annular return fluid flow field, improving the efficiency and quality of cementing operations.

[0024] In such Figure 1 In the preferred embodiment shown, an outer sealing groove 8 may be provided on the outer side of the integrated ring plate body 6, and an outer sealing ring is provided in the outer sealing groove 8. The lower end of the integrated ring plate body 6 is inserted into the water guide sleeve, and the outer sealing ring is disposed between the two. This embodiment achieves a reliable seal between the integrated ring plate body 6 and the water guide sleeve by providing an outer sealing groove and an outer sealing ring at the lower end of the integrated ring plate body 6, forming a third sealing barrier, thereby constituting a complete multi-layer sealing system from the inside out.

[0025] In a preferred embodiment, the first sealing ring 2, the second sealing ring 5, and the outer sealing ring can all be O-rings. O-rings offer advantages such as reliable sealing performance, low cost, and ease of procurement and replacement, ensuring practicality and economy.

[0026] In such Figure 1 In the preferred embodiment shown, a wellhead connector 63 is also provided at the upper end of the integrated annular plate body 6. This configuration enables the integrated annular plate body 6 to also integrate wellhead connection functionality, allowing direct connection to subsequent wellhead devices (such as blowout preventer assemblies or Christmas trees), simplifying the wellhead structure, reducing the number of parts, and improving installation efficiency.

[0027] In a preferred embodiment, the sealing sleeve 1 and the surface sleeve 3 may be an interference fit. This interference fit ensures that the sealing sleeve 1 and the surface sleeve 3 generate sufficient clamping force and sealing preload during initial installation, preventing relative movement and assisting the second sealing ring 5 in achieving a better sealing effect.

[0028] In another preferred embodiment, the sealing sleeve 1 can be prefabricated on the surface sleeve 3. The sealing sleeve 1 can be pre-installed on the surface sleeve 3 on the ground and lowered into the sea along with the sleeve, which simplifies the process and reduces the difficulty of high-altitude operations at sea, improves operational safety, and reduces the time spent at sea.

[0029] According to this utility model, in a preferred embodiment, both the integrated ring plate body 6 and the sealing sleeve 1 can be made of high-strength alloy steel. The selection of high-strength alloy steel ensures that the entire device has sufficient mechanical strength, toughness, and impact resistance, enabling it to withstand complex high-pressure and high-load conditions downhole, meet the requirements of API and other relevant standards, and guarantee the long-term service life of the equipment.

[0030] Furthermore, a nitrided layer or a hard chrome layer may be formed on the outer surface of the sealing sleeve 1 to improve the hardness, wear resistance and corrosion resistance of its sealing groove and mating surface, effectively preventing the sealing ring from being squeezed out under high pressure or the sealing surface from failing due to wear and corrosion, thus extending the maintenance cycle and service life of key components.

[0031] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application shall have the ordinary meaning as understood by one of ordinary skill in the art to which this utility model pertains.

[0032] In the description of this application, it should be understood that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This utility model is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An integrated ring plate for cementing, characterized in that, include: A sealing sleeve (1) and an integrated ring plate body (6); the sealing sleeve (1) is annular, and its inner side wall and outer side wall are respectively provided with annular second sealing groove and first sealing groove, and the second sealing groove and the first sealing groove are respectively provided with second sealing ring (5) and first sealing ring (2); the sealing sleeve (1) is used to fit on the surface sleeve (3), and the second sealing ring (5) is located between the sealing sleeve (1) and the surface sleeve (3); the integrated ring plate body (6) is provided with an axially penetrating central channel, and the upper part of the central channel is provided with an inner mounting shoulder; the sealing sleeve (1) is embedded in the central channel and its lower end face is sealed to the inner mounting shoulder, and the first sealing ring (2) is located between the sealing sleeve (1) and the integrated ring plate body (6); the outer side wall of the integrated ring plate body (6) is provided with a return liquid interface (7); the lower end of the integrated ring plate body (6) is used to seal the insertion into the water guide sleeve.

2. The integrated ring plate for cementing according to claim 1, characterized in that, The inner mounting shoulder is formed as an inner conical surface. The sealing sleeve (1) includes an equal-diameter section away from the integral ring plate body (6) and an inner conical section connected to the equal-diameter section and close to the integral ring plate body (6). The inner conical section is formed with an outer conical surface (4) that matches the inner conical surface. The first sealing ring (2) is disposed on the equal-diameter section.

3. The integrated ring plate for cementing according to claim 1 or 2, characterized in that, The number of return interfaces (7) is multiple, and they are evenly arranged at the same circumference along the outer side wall of the integrated ring plate body (6).

4. The integrated ring plate for cementing according to claim 1 or 2, characterized in that, An outer sealing groove (8) is provided on the outer side of the integrated ring plate body (6), and an outer sealing ring is provided in the outer sealing groove (8). The lower end of the integrated ring plate body (6) is inserted into the water guide sleeve and the outer sealing ring is located between the two.

5. The integrated ring plate for cementing according to claim 4, characterized in that, The first sealing ring (2), the second sealing ring (5) and the outer sealing ring are all O-rings.

6. The integrated ring plate for cementing according to claim 1 or 2, characterized in that, The upper end of the integrated ring plate body (6) is also provided with a wellhead connector.

7. The integrated ring plate for cementing according to claim 1 or 2, characterized in that, The sealing sleeve (1) and the surface sleeve (3) are interference fit.

8. The integrated ring plate for cementing according to claim 1 or 2, characterized in that, The sealing sleeve (1) is prefabricated on the surface sleeve (3).

9. The integrated ring plate for cementing according to claim 1 or 2, characterized in that, Both the integrated ring plate body (6) and the sealing sleeve (1) are made of high-strength alloy steel.

10. The integrated ring plate for cementing according to claim 9, characterized in that, The outer surface of the sealing sleeve (1) is formed with a nitrided layer or a hard chrome layer.

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