Composite load special buckle casing pipe for ultra-deep oil and gas well

Abstract

The utility model relates to the field of oil casing connectors for oil drilling, and discloses a composite load special buckle casing for an ultra-deep oil gas well, which comprises an outer pipe, an inner pipe is fixedly connected inside the outer pipe, one end of the outer wall of the outer pipe is fixedly connected with an upper joint, and the other end of the outer pipe is fixedly connected with a lower joint. The outer wall of the outer pipe is fixedly connected with a rubber sleeve assembly, the rubber sleeve assembly is located on one side of the upper connector, the outer wall of the outer pipe is slidably connected with a floating head, one end of the outer pipe is provided with a central pipe, the central pipe is fixedly connected into the lower connector, and the outer wall of the outer pipe is fixedly connected with a plurality of connecting pieces. A hole groove is formed in each connecting piece. According to the utility model, through the cooperation of the rubber sleeve assembly, the floating head, the central pipe and other structures, the stress and pressure concentration generated by the movement of wellhead equipment or a pipeline are reduced or eliminated. By means of the design, abrasion of the rubber sleeve assembly and the pipeline structure can be reduced, and the service life is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of oil casing connector for oil drilling, especially to a special casing of composite load for ultra-deep oil and gas well. BACKGROUND

[0002] The special casing of composite load in ultra-deep oil and gas well is a key device for coping with extreme environment and complex working conditions. This casing design has multiple functions and characteristics, aiming to ensure the safety and efficiency of downhole operation, and ensure the stability and long-term reliability of the wellbore structure. The special casing of composite load plays a key role in ultra-deep oil and gas wells, with high strength, corrosion resistance and multiple sealing design to ensure the safety and efficiency of downhole operation, and is an indispensable part of modern oil and gas exploration.

[0003] In the special casing of composite load for ultra-deep oil and gas well, the pipe body is the main part of the casing, responsible for bearing the formation pressure around the wellbore, supporting the well wall and maintaining the stability of the wellbore. The joint is used to connect and fix the ends of the two casing pipe bodies, forming a continuous pipeline. It usually uses threads or other special designs to ensure the tightness and sealing of the connection. The sealing system is located in the connection part of the joint or casing, used to prevent oil and gas or well water from leaking from the pipeline interface to the wellbore or surface.

[0004] However, the sealing system in the traditional casing is often a rubber sealing ring, a metal sealing ring or a special sealant. This sealing method is relatively single, and can only seal the single casing connection position, still having the problem of downhole leakage, reducing its practicality. UTILITY MODEL CONTENTS

[0005] In order to make up for the above shortcomings, the utility model provides a special casing of composite load for ultra-deep oil and gas well, aiming to improve the sealing method of the sealing system in the traditional casing, which is relatively single and can only seal the single casing connection position, still having the problem of downhole leakage, reducing its practicality.

[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme: a special casing of composite load for ultra-deep oil and gas well, comprising an outer pipe, the inner pipe is fixedly connected inside the outer pipe, the upper joint is fixedly connected to one end of the outer pipe, and the lower joint is fixedly connected to the other end of the outer pipe.

[0007] Further, the outer pipe outer wall is fixedly connected with a rubber tube assembly.

[0008] Further, the rubber tube assembly is located on the side of the upper joint.

[0009] Further, the outer pipe outer wall is slidably connected with a floating head.

[0010] Further, the outer tube is provided with a center tube at one end.

[0011] Further, the center tube is fixedly connected inside the lower joint.

[0012] Further, the outer tube is provided with a center tube at one end.

[0013] Further, the outer tube is provided with a center tube at one end.

[0014] The utility model has the following beneficial effects:

[0015] 1. In the utility model, firstly, the floating head handles the linear expansion or distortion problem caused by well pressure change in the oil and gas well, and is connected with the wellhead equipment or pipeline, can freely move or rotate, when the well pressure changes, the floating head allows the upper part of the rubber tube assembly to move slightly in the horizontal direction, thereby reducing or eliminating the stress and pressure concentration caused by the movement of the wellhead equipment or pipeline. This design can reduce the wear of the rubber tube assembly and the pipeline structure, and prolong the service life.

[0016] 2. In the utility model, the outer tube is the outer structure of the casing, which is made of high-strength steel pipe or special alloy, and can bear the extreme load and pressure underground. The inner tube is the inner structure of the casing, which is located inside the outer casing and serves as the main closed pipeline for transporting oil and gas or other fluids. The connecting piece and the hole groove can be used as additional connecting structures. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 A perspective view of a special casing for super deep oil and gas wells with composite load is provided for the utility model;

[0018] Figure 2 A perspective view of a special casing for super deep oil and gas wells with composite load is provided for the utility model;

[0019] Figure 3 A perspective view of a special casing for super deep oil and gas wells with composite load is provided for the utility model;

[0020] LEGEND:

[0021] 1. Outer tube; 2. Inner tube; 3. Upper joint; 4. Rubber tube assembly; 5. Floating head; 6. Center tube; 7. Lower joint; 8. Connecting piece; 9. Hole groove. DETAILED DESCRIPTION

[0022] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described, obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0023] With reference to Figures 1-2 The present application provides an embodiment: a special casing of composite load for ultra-deep oil and gas well, comprising an outer pipe 1, an inner pipe 2 fixedly connected inside the outer pipe 1, an upper joint 3 fixedly connected to one end of the outer wall of the outer pipe 1, and a lower joint 7 fixedly connected to the other end of the outer pipe 1.

[0024] Specifically, in the sealing structure of the casing, the upper joint 3 is located at the top of the casing, which is fixedly connected with the pipeline at the upper part and supports the overall structure of the packer, the lower joint 7 is located at the bottom of the casing, which is connected with the pipeline or other equipment under the well and bears the sealing function of the bottom structure of the casing and the casing body, the center pipe 6 is responsible for transmitting oil and gas or other fluids, which is connected with the upper joint 3 and the lower joint 7 and ensures no leakage during the fluid transmission through the internal sealing element, the floating head 5 is a special design, which is used to deal with the linear expansion or distortion problem caused by the change of well pressure in the oil and gas well, which is installed at the upper part of the rubber sleeve assembly 4 and connected with the wellhead equipment or pipeline, and can move or rotate freely, the design principle of the floating head 5 allows the rubber sleeve assembly 4 to move slightly in the horizontal direction when the well pressure changes, thereby reducing or eliminating the stress and pressure concentration caused by the movement of the wellhead equipment or pipeline, which effectively reduces the wear of the rubber sleeve assembly 4 and the pipeline structure and prolongs the service life, and at the same time improves the safety and efficiency of the downhole operation.

[0025] With reference to Figure 3 The outer wall of the outer pipe 1 is fixedly connected with the rubber sleeve assembly 4, the rubber sleeve assembly 4 is located on one side of the upper joint 3, the outer wall of the outer pipe 1 is slidingly connected with the floating head 5, one end of the outer pipe 1 is provided with the center pipe 6, the center pipe 6 is fixedly connected inside the lower joint 7, and the outer wall of the outer pipe 1 is fixedly connected with a plurality of connecting pieces 8, and a hole slot 9 is formed in each connecting piece 8.

[0026] Specifically, the outer tube (1) as the outer structure of the casing, is usually made of high-strength steel pipe or special alloy, can withstand extreme load and pressure downhole, provide protection and support, the inner tube (2) is located inside the outer sleeve, as the main internal closed pipeline, for transporting oil and gas or other fluids, the connector (8) and the hole (9) are additional connection structure of the casing, the connector (8) is used to connect the above parts, to ensure the integrity and safety of the casing, the hole (9) can be used to install additional equipment or other customized operations when needed, providing flexibility and scalability, such design not only ensures the reliability and safety of the casing under high pressure, high temperature and complex formation conditions, but also allows customization and adaptation according to specific downhole needs, through reasonable inner and outer structure and connection design, the casing can effectively support the oil and gas production process, ensure the stability of the wellbore and the safe transportation of fluid.

[0027] Working principle: first in this casing sealing structure, the upper joint 3 is located at the top of the casing. It is fixedly connected with the upper pipeline, at the same time supports the overall structure of the packer, the lower joint 7 is located at the bottom of the casing. It is connected with the downhole pipeline or other equipment, at the same time bears the sealing function of the casing bottom structure and the casing body, the center tube 6 is responsible for the transmission of oil and gas or other fluids, connects the upper joint 3 and the lower joint 7, and ensures that there is no leakage in the transmission process of the fluid through the internal sealing element, the floating head 5 is mainly used to handle the linear expansion or distortion problem caused by well pressure change in the oil and gas well, and is connected with the wellhead equipment or pipeline, which can move or rotate freely. The floating head 5 allows the upper part of the rubber cylinder assembly 4 to move slightly in the horizontal direction when the well pressure changes, thereby reducing or eliminating the stress and pressure concentration caused by the movement of the wellhead equipment or pipeline. This design can reduce the wear and tear of the rubber cylinder assembly 4 and the pipeline structure, prolong its service life, and at the same time improve the safety and efficiency of downhole operation, and the inner part of the casing is inner and outer, the outer tube 1 is the outer structure of the casing, which is made of high-strength steel pipe or special alloy, can withstand extreme load and pressure downhole, the inner tube 2 is the inner structure of the casing, which is located inside the outer sleeve, as the main internal closed pipeline, for transporting oil and gas or other fluids, through the connector 8 and the hole 9, which can be used as additional connection structure.

[0028] Finally, it should be pointed out that: the above only for the preferred embodiments of the present application, and is not intended to limit the present application, although the present application has been described in detail with reference to the foregoing embodiments, for those skilled in the art, it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features, any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application, shall be included in the protection scope of the present application.

Claims

1. A special composite load casing for ultra-deep oil and gas wells, comprising an outer pipe (1), characterized in that: The outer pipe (1) is internally fixedly connected with an inner pipe (2), one end of the outer pipe (1) is fixedly connected with an upper joint (3), and the other end of the outer pipe (1) is fixedly connected with a lower joint (7).

2. The special coupling of the composite load of the ultra-deep oil and gas well according to claim 1, characterized in that: The outer pipe (1) is fixedly connected with a rubber tube assembly (4) on the outer wall.

3. The ultra-deep oil and gas well composite load special bucking casing of claim 2, wherein: The rubber tube assembly (4) is located on one side of the upper joint (3).

4. The ultra-deep oil and gas well composite load special casing of claim 3, wherein: The outer pipe (1) is slidably connected with a floating head (5) on the outer wall.

5. The ultra-deep oil and gas well composite load special bucking casing of claim 4, wherein: One end of the outer pipe (1) is provided with a center pipe (6).

6. The ultra-deep oil and gas well composite load special bucking casing of claim 5, wherein: The center pipe (6) is fixedly connected in the lower joint (7).

7. The ultra-deep oil and gas well composite load special bucking casing of claim 6, wherein: The outer pipe (1) is fixedly connected with a plurality of connecting pieces (8) on the outer wall.

8. The ultra-deep oil and gas well composite load special bucking casing of claim 7, wherein: A hole groove (9) is formed in each connecting piece (8).

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