Thermal compensation oil casing coupling

Abstract

The utility model relates to the technical field of casing couplings, and discloses a thermal compensation oil casing coupling which comprises a connecting hoop and a pipeline, a protection assembly is arranged on the outer wall of the connecting hoop, and the protection assembly is used for protecting the connecting hoop and the pipeline from excessive deformation and damage in the axial direction when the connecting hoop and the pipeline expand with heat and contract with cold. An adjusting assembly is arranged on one side of the connecting hoop and used for dynamically adjusting the pre-tightening force, the protection assembly comprises a limiting ring, the limiting ring is fixedly connected to the outer wall of the connecting hoop, and the other side of the elastic corrugated pipe is fixedly connected to the inner side of the connecting ring. According to the utility model, when the connecting hoop is tightened, the gasket is extruded and deformed, and meanwhile, the elastic corrugated pipe achieves the effect of buffering the axial stress and the radial stress by virtue of the good elasticity and the telescopic characteristic of the elastic corrugated pipe when the connecting hoop and the pipeline expand with heat and contract with cold, so that the problem that the traditional equipment cannot adapt to expansion with heat and contract with cold is solved; and the working efficiency of mining operation is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of casing coupling, especially to the thermal compensation petroleum casing coupling. BACKGROUND

[0002] Petroleum, as an important energy resource in the world, plays a vital role in the development of modern industry and social economy. It is widely used in many fields such as transportation, chemical industry, and power, and is the key driving force for the advancement of various industries. In the complex and critical industrial field of oil exploitation, the petroleum casing plays an important role, and the petroleum casing coupling is a key connecting component in the petroleum casing system, which is responsible for tightly connecting individual casings together to form a continuous and stable wellbore protection and transportation system. It not only ensures the firm and reliable connection between the casings, can withstand the pressure from the formation, the impact force of the fluid in the wellbore, and other external forces, but also ensures the good sealing of the entire connection part to prevent the leakage of valuable resources such as petroleum and natural gas during transportation, thereby maintaining the normal operation of oil exploitation and ensuring the safety of the exploitation environment.

[0003] The traditional equipment mainly uses conventional thread connection to deal with the thermal expansion and contraction of the coupling. The matching threads are processed on the casing end and the coupling interior, and the initial connection and fixation are achieved by screwing and relying on thread friction. In terms of technical principles, the thermal expansion coefficients of the casing and the coupling materials are considered, and materials with similar coefficients are selected to expect that the expansion or contraction amplitudes of the two are similar when the temperature changes to reduce the connection problems.

[0004] However, when the casing and the coupling deform due to temperature changes, the existing technology cannot fully dynamically buffer and effectively adjust the stress on the connection part. For example, when the temperature rises and expands, although the material coefficient matching can coordinate part of the expansion, there is no effective buffering and adjusting mechanism for axial tension, extrusion stress, etc. Only relying on thread friction and rubber sealing cannot fully absorb and disperse stress, resulting in loose and deformed connection parts, affecting the stability and sealing of the system. Therefore, the thermal compensation petroleum casing coupling is proposed to solve the above problems. UTILITY MODEL CONTENTS

[0005] To make up for the above shortcomings, the utility model provides a thermal compensation petroleum casing coupling, aiming to improve the problem of insufficient comprehensive compensation in the existing technology when dealing with the thermal expansion and contraction of the pipeline and the coupling due to temperature changes.

[0006] To achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A thermally compensated oil casing coupling comprises a coupling and a pipe. The outer wall of the coupling is provided with a protective component for protecting the coupling and the pipe from excessive deformation and damage in the axial direction due to thermal expansion and contraction. An adjustment component is provided on one side of the coupling for dynamically adjusting the preload force.

[0008] The protective assembly includes a limiting ring, which is fixedly connected to the outer wall of the connecting hoop, and one side of the limiting ring is fixedly connected to an elastic bellows, which is corrugated. The outer wall of the pipe is provided with a thread, and the outer wall of the pipe is fixedly connected to the connecting ring, and the other side of the elastic bellows is fixedly connected to the inner side of the connecting ring;

[0009] As a further description of the above technical solution:

[0010] The adjustment assembly includes a washer, which is fixedly connected to one end of the connecting collar and is used to prevent the fluid in the wellbore from leaking out from the connection portion between the connecting collar and the pipeline;

[0011] As a further description of the above technical solution:

[0012] A butterfly spring washer 1 is provided on one side of the washer, and the butterfly spring washer 1 is used to accurately adjust and maintain the preload force;

[0013] As a further description of the above technical solution:

[0014] A butterfly spring washer 2 is provided on one side of the butterfly spring washer 1, and the butterfly spring washer 2 is used to buffer the stress concentration in the axial direction when the pipeline undergoes thermal expansion and contraction, fluid flow impact, etc.;

[0015] As a further description of the above technical solution:

[0016] A butterfly spring pad 3 is provided on one side of the butterfly spring pad 2, and a gasket is fixedly connected to one side of the butterfly spring pad 3. The butterfly spring pad 3 is used to cooperate with the gasket to improve the sealing effect;

[0017] As a further description of the above technical solution:

[0018] The butterfly spring pad is made of spring steel, which has high strength and good elastic limit, can withstand large loads and recover to its original shape after unloading.

[0019] As a further description of the above technical solution:

[0020] The elastic bellows is made of nitrile rubber, which makes it have good oil resistance, wear resistance and aging resistance, and can well resist the erosion of oil during use.

[0021] The utility model has the following beneficial effects:

[0022] In the utility model, when the connecting hoop is tightened, the gasket will be squeezed and deformed to fill the tiny gap between the connecting hoop and the pipe. At the same time, when the connecting hoop and the pipe produce thermal expansion and contraction, the elastic bellows can expand or contract accordingly in the axial and radial directions as the connecting hoop and the pipe expand and contract due to its good elasticity and retractable properties, thereby achieving the effect of buffering axial stress and radial stress, solving the problem that traditional equipment cannot adapt to thermal expansion and contraction, and improving the working efficiency of mining operations.

[0023] In the utility model, when the connecting hoop is connected and installed with the pipeline, the butterfly spring group three is compressed by tightening the connecting hoop. The butterfly spring group three can accurately generate and control the size of the preload force based on its specific elastic characteristics, and at the same time drive the butterfly spring group two and the butterfly spring group one to move synchronously, thereby achieving the effect of precise control and maintenance of the preload force, solving the problem of component deformation caused by stress concentration in traditional equipment, and improving the operation stability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a three-dimensional schematic diagram of the thermal compensation petroleum casing coupling proposed by the utility model;

[0025] Figure 2 This is a schematic diagram of the structure inside the elastic bellows of the thermal compensation petroleum casing coupling proposed by the present invention;

[0026] Figure 3 This is a structural schematic diagram of one side of the connecting collar of the thermal compensation petroleum casing coupling proposed by the utility model.

[0027] Legend:

[0028] 1. Connecting hoop; 2. Pipe; 3. Thread; 4. Connecting ring; 5. Limiting ring; 6. Elastic bellows; 7. Washer; 8. Butterfly spring washer 1; 9. Butterfly spring washer 2; 10. Butterfly spring washer 3; 11. Gasket. DETAILED DESCRIPTION

[0029] 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 embodiments described are only 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 making creative efforts are within the scope of protection of the present invention.

[0030] Reference Figure 1 and Figure 2The utility model provides an embodiment of a thermally compensated oil casing coupling, comprising a coupling ferrule 1 and a pipe 2. The outer wall of the coupling ferrule 1 is provided with a protective component, which is used to protect the coupling ferrule 1 and the pipe 2 from excessive deformation and damage in the axial direction due to thermal expansion and contraction. An adjustment component is provided on one side of the coupling ferrule 1. The main function of this component is to dynamically adjust the preload force to meet the needs of different working conditions and ensure the stability and sealing of the connection. The adjustment component is used to dynamically adjust the preload force.

[0031] The protective component includes a limit ring 5, which is fixedly connected to the outer wall of the connecting hoop 1. An elastic bellows 6 is fixedly connected to one side of the limit ring 5, which limits the range of movement of the elastic bellows 6 and ensures that it can freely expand and contract within a certain range without exceeding the design limit. The design of the limit ring 5 enables it to form a stable connection with the connecting hoop 1 and provide additional support. The elastic bellows 6 is corrugated so that it can effectively absorb and buffer the deformation caused by thermal expansion and contraction of the pipe 2 when the temperature changes. The outer wall of the pipe 2 is provided with threads 3. These threads 3 not only enhance the connection effect with the connecting hoop 1, but also provide additional friction to ensure a stable connection between the two. A connecting ring 4 is fixedly connected to the outer wall of the pipe 2. The connecting ring 4 is intended to provide a firm connection point for the elastic bellows 6 to further enhance the overall stability of the system. The other side of the elastic bellows 6 is fixedly connected to the inner side of the connecting ring 4.

[0032] Specifically, when the connecting hoop 1 and the sleeve 2 are connected and installed, it is necessary to apply sufficient and appropriate pre-tightening force to the connection part to ensure that the two are tightly connected to prevent loosening during subsequent operation. When the operator manually screws the pipe 2 into the connecting hoop 1, the main function of the connecting hoop 1 is to fix the pipe 2 to ensure its stability and sealing. As the temperature of the medium increases, the pipe 2 will produce axial and radial dimensional elongation due to thermal expansion. In this process, the elastic bellows 6 is particularly critical. It has a corrugated structure, which enables it to undergo elastic stretching under the action of thermal stress. shape, the elastic properties of the elastic bellows 6 enable it to effectively absorb the elongation of the pipe 2, thereby preventing the pipe 2 from being damaged due to excessive stress and ensuring the safe operation of the system. On the contrary, when the medium temperature drops, the pipe 2 will shrink, and the elastic bellows 6 will shrink accordingly and return to its initial state. This process ensures a tight connection between the pipe 2 and the connecting hoop 1, preventing loose gaps due to shrinkage, thereby maintaining the sealing and stability of the pipe 2. In addition, the elastic bellows 6 can also effectively reduce vibration and noise caused by temperature changes, thereby improving the durability and reliability of the entire system.

[0033] Reference Figure 3The adjusting component includes a gasket 7, which is made of nitrile rubber, so that it has good oil resistance, wear resistance and aging resistance, and effectively prevents the performance of the gasket 7 from being degraded or damaged due to oil corrosion. The gasket 7 is fixedly connected to one end of the connecting hoop 1. The gasket 7 is used to prevent the fluid in the wellbore from leaking out from the connection part of the connecting hoop 1 and the pipeline 2. A butterfly spring washer 8 is provided on one side of the gasket 7. It is made of spring steel, so that it has a high elastic limit and fatigue strength, and can maintain good elastic performance during long-term use. The butterfly spring washer 8 is used to assume the role of precise adjustment and maintenance of the preload force. A butterfly spring washer 2 9 is provided on one side of the butterfly spring washer 8, which is also made of spring steel to have the same performance. The butterfly spring washer 2 9 is used to buffer the stress concentration in the axial direction when the pipeline 2 undergoes thermal expansion and contraction, fluid flow impact and other factors.

[0034] Specifically, when the oil casing coupling and casing are installed for the first time, it is necessary to ensure that the connection between the two is tight and stable to cope with various external forces that may be borne during subsequent operation, such as formation pressure, impact force generated by fluid flow in the wellbore, etc. By tightening the connecting hoop 1, the butterfly spring pad 3 10 can be effectively compressed. In this process, the pressure exerted by the connecting hoop 1 causes the butterfly spring pad 3 10 to undergo corresponding compression deformation, thereby storing elastic potential energy, thereby providing elastic support for the system, and also generating a pre-tightening force between the connecting hoop 1 and the pipeline 2. The pre-tightening force is very important for the stability of the connection. At the same time, the butterfly spring pad 2 9 is also affected and moves accordingly.

[0035] Refer to the figure Figure 3 A butterfly spring pad three 10 is provided on one side of the butterfly spring pad two 9. The design of the butterfly spring pad three 10 is intended to further improve the sealing effect of the system. A gasket 11 is fixedly connected to one side of the butterfly spring pad three 10. The butterfly spring pad three 10 is used to cooperate with the gasket 11 to improve the sealing effect. The butterfly spring pad three 10 is made of spring steel, which has high strength and good elastic limit. It can withstand large loads and recover to its original shape after unloading. The elastic bellows 6 is made of nitrile rubber, which has good oil resistance, wear resistance and aging resistance, and can resist oil erosion well when in use.

[0036] Specifically, the butterfly spring washer 29, with its unique elastic compression mechanism, can effectively withstand and disperse the stress applied in the axial direction, prevent damage to the connection part due to excessive axial stress, thereby ensuring the reliability of the connection part and reducing the potential failure risk caused by vibration or temperature change. When the connecting hoop 1 is installed and in a stationary state, the butterfly spring washer 18 plays its elastic role and applies uniform pressure to the gasket 7. The pressure applied by the butterfly spring washer 18 to the gasket 7 can be evenly transmitted to the contact surface between the gasket 7 and the connecting hoop 1. This uniform pressure enhances the fit between the gasket 7 and the surface of the connecting hoop 1, thereby significantly improving the sealing effect, and can effectively prevent the leakage of fluids such as oil, gas, and water in the wellbore, ensuring the safe and efficient operation of the system, so that the entire system achieves good stability, sealing and safety.

[0037] Working principle: When using this device, the operator manually screws the pipe 2 into the inside of the connecting hoop 1. When the temperature of the medium in the pipe 2 rises, the pipe 2 will produce axial and radial elongation due to thermal expansion, and the elastic bellows 6 will undergo elastic stretching deformation under the action of thermal stress. Its corrugated structure can be stretched and expanded, thereby absorbing the elongation of the pipe 2 and preventing the pipe from being damaged by excessive stress due to thermal expansion. On the contrary, when the medium temperature drops, the pipe 2 will shrink, and the elastic bellows 6 will shrink accordingly to return to its initial state, maintaining a close connection with the pipe 2, preventing the pipe 2 from loosening due to shrinkage, and ensuring the sealing and stability of the pipe 2. At the same time, by tightening the connecting hoop 1, the butterfly spring pad 3 10 is compressed. When the connecting hoop is tightened, 1, the pressure applied to the butterfly spring washer 3 10 causes it to produce corresponding compression deformation, thereby storing elastic potential energy, and at the same time generating a pre-tightening force between the connecting hoop 1 and the pipe 2, which will synchronously drive the butterfly spring washer 2 9 to move. The butterfly spring washer 2 9 bears and disperses the stress in the axial direction through its own elastic compression mechanism, avoiding damage to the connection part caused by excessive axial stress. At the same time, when the connecting hoop 1 is installed and in a static state, the butterfly spring washer 1 8 applies pressure to the gasket 7 by virtue of its own elasticity. The pressure applied by the butterfly spring washer 1 8 on the gasket 7 will be evenly transmitted to the contact surface between the gasket 7 and the connecting hoop 1, thereby enhancing the fit between the gasket 7 and the surface of the connecting hoop 1, thereby significantly improving the sealing effect and preventing leakage of fluids such as oil, gas and water in the wellbore.

[0038] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A thermally compensated petroleum casing coupling, comprising a coupling collar (1) and a pipe (2), characterized in that: The outer wall of the connecting hoop (1) is provided with a protective component, which is used to protect the connecting hoop (1) and the pipe (2) from excessive deformation and damage in the axial direction when they expand and contract due to heat. An adjustment component is provided on one side of the connecting hoop (1), which is used to dynamically adjust the preload force. The protective assembly comprises a limiting ring (5), the limiting ring (5) is fixedly connected to the outer wall of the connecting hoop (1), one side of the limiting ring (5) is fixedly connected to an elastic bellows (6), the elastic bellows (6) is corrugated, the outer wall of the pipe (2) is provided with a thread (3), the outer wall of the pipe (2) is fixedly connected to a connecting ring (4), and the other side of the elastic bellows (6) is fixedly connected to the inner side of the connecting ring (4).

2. The thermally compensated petroleum casing coupling according to claim 1, characterized in that: The adjustment assembly comprises a gasket (7), which is fixedly connected to one end of the connecting hoop (1). The gasket (7) is used to prevent the fluid in the wellbore from leaking out from the connection portion between the connecting hoop (1) and the pipeline (2).

3. The thermally compensated petroleum casing coupling according to claim 2, characterized in that: A butterfly spring washer (8) is provided on one side of the washer (7), and the butterfly spring washer (8) is used to precisely adjust and maintain the preload force.

4. The thermally compensated petroleum casing coupling according to claim 3, characterized in that: A butterfly spring pad 2 (9) is provided on one side of the butterfly spring pad 1 (8), and the butterfly spring pad 2 (9) is used to buffer stress concentration in the axial direction when the pipeline (2) experiences thermal expansion and contraction, or fluid flow impact factors.

5. The thermally compensated petroleum casing coupling according to claim 4, characterized in that: A butterfly spring pad three (10) is provided on one side of the butterfly spring pad two (9), and a gasket (11) is fixedly connected to one side of the butterfly spring pad three (10). The butterfly spring pad three (10) is used to cooperate with the gasket (11) to improve the sealing effect.

6. The thermally compensated petroleum casing coupling according to claim 5, characterized in that: The butterfly spring pad three (10) is made of spring steel.

7. The thermally compensated petroleum casing coupling according to claim 1, characterized in that: The elastic bellows (6) is made of nitrile rubber.

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