Petroleum casing pipe capable of enhancing external clamping force

Abstract

The utility model provides a petroleum casing pipe capable of enhancing external clamping force, which relates to the technical field of petroleum drilling, and is characterized in that outer circle parts at two ends of a casing pipe body are provided with friction-resistant grain structures, the two outer circle parts are positioned at positions clamped by an upper shackle, and one end part of the petroleum casing pipe is connected with a coupling; the length of the line structure in the length direction of the oil casing is 30-50 mm larger than that of the coupling. The grain structure is matched with the tooth plate for use, so that the friction coefficient of the sleeve is obviously improved, the friction force of the tooth plate for clamping the sleeve is increased, the success rate of clamping the sleeve by the indentation-free tooth plate is obviously improved, the damage of the sleeve is obviously reduced, the abrasion of the tooth plate is also obviously reduced, the replacement frequency of the tooth plate is also reduced, and the cost is reduced. The casing running operation time is saved, and considerable economic benefits are generated; meanwhile, as the friction force is large enough, the positive pressure of the indentation-free tooth plate on the casing pipe can be properly reduced, the deformation of the upper shackle part of the casing pipe is reduced, the upper shackle quality is improved, and the air tightness of a pipe column can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of oil drilling, and specifically, to an oil casing pipe with enhanced external clamping force. Background Technique

[0002] In downhole casing operations in oil and gas fields, casing power tongs are commonly used to make and break casing connections. Conventional casing power tongs use metal toothed jaws to grip the casing, providing reliable clamping. However, since the metal toothed jaws press into the surface of the casing, permanent indentations are left on the casing surface.

[0003] In special oil and gas fields, corrosion-resistant casings are used, and it is required that no indentations are left on the casing surface after the casing running operation, and damage to the casing during the casing running operation should be minimized. Measures taken include designing and manufacturing non-indentation casing power tongs. The non-indentation casing power tongs use non-indentation jaws to grip the casing and rely on the friction force of the non-indentation jaws on the casing to drive the casing to make and break connections. To have sufficient friction force, on the one hand, the non-indentation jaws should have a sufficiently high coefficient of friction, and on the other hand, the normal pressure of the non-indentation jaws on the casing should be large enough. Moreover, the outer circles of both ends of the currently used oil casing pipes at the positions where the connections are made and broken are smooth. Under the working condition of a large make and break torque of the casing, relying solely on increasing the friction force of the non-indentation jaws on the casing unilaterally cannot complete the task. Increasing the friction force of the non-indentation jaws on the casing unilaterally is limited, and excessive normal stress will cause excessive deformation of the make and break part of the casing, affecting the quality of making and breaking connections. Content of the Utility Model

[0004] The purpose of the utility model is to provide an oil casing pipe with enhanced external clamping force to solve one or more of the problems raised in the above background technique.

[0005] To achieve the above purpose, one of the purposes of the utility model is an oil casing pipe with enhanced external clamping force, including a casing body. Anti-friction texture structures are provided on the outer circular parts at both ends of the casing body. The two outer circular parts are located at the positions where the connections are made and broken. One end of the oil casing pipe is connected with a coupling. The length of the texture structure in the length direction of the oil casing pipe is 30 - 50 millimeters larger than the length of the coupling.

[0006] As a preferable implementable mode, the depth of the texture of the anti-friction texture structure is less than or equal to 1 millimeter.

[0007] As a preferable implementable mode, the anti-friction texture structure includes straight lines and mesh patterns.

[0008] As a preferable implementable mode, the cross-section of the texture of the anti-friction texture structure is any one or more of a triangle, an arc, and an ellipse.

[0009] As an achievable preferred mode, the patterns of the friction-resistant pattern structure include continuous patterns and discontinuous patterns.

[0010] Compared with the prior art, the utility model has the following beneficial effects:

[0011] The structure of the utility model is simple and ingeniously designed. When using this pattern structure in cooperation with the die plate, the friction coefficient of the casing is significantly increased, the friction force for the die plate to clamp the casing is increased. Due to the sufficiently large friction force, the success rate of the non-indentation die plate clamping the casing is significantly increased, the damage to the casing is significantly reduced, and at the same time, the wear of the die plate is also significantly reduced. Therefore, the replacement times of the die plate are reduced, the casing operation time is saved, and considerable economic benefits are generated; at the same time, due to the sufficiently large friction force, the normal pressure of the non-indentation die plate on the casing can be appropriately reduced, thereby reducing the deformation amount of the casing make-up and break-out part, improving the make-up and break-out quality, and improving the airtightness of the pipe string. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a structural diagram of an oil casing with enhanced external clamping force of the utility model;

[0013] Figure 2 is a structural diagram of the discontinuous pattern of an oil casing with enhanced external clamping force of the utility model;

[0014] Figure 3 is a structural diagram of the reticulate pattern of an oil casing with enhanced external clamping force of the utility model;

[0015] Figure 4 is a schematic diagram of a triangular cross-section;

[0016] Figure 5 is Figure 4 an enlarged schematic diagram of A in

[0017] Figure 6 is a schematic diagram of a circular arc cross-section;

[0018] Figure 7 is Figure 6 an enlarged schematic diagram of B in

[0019] Figure 8 is a schematic diagram of an elliptical cross-section;

[0020] Figure 9 is Figure 8 an enlarged schematic diagram of C in DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are only a part rather than all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0022] As Figure 1-2 shown, for an oil casing with enhanced external clamping force, anti-friction texture structures are provided on the outer circular parts at both ends of the oil casing. The two outer circular parts are located at the positions clamped by the make-up and break-out. One end of the oil casing is connected to a coupling. The length of the texture structure in the length direction of the oil casing is 30 - 50 mm greater than the length of the coupling. It should be noted that the outer circular texture at the end of the oil casing body is 30 - 50 mm longer than the outer circular texture of the coupling. The texture depth of the texture structure is less than or equal to 1 mm. The texture structure includes straight lines and mesh patterns. Due to the relatively long length of the casing, according to the method of mechanical drawing, two vertical lines are used as ellipsis in the middle of the casing body for illustration.

[0023] The cross-section of the texture is any one or more of a triangle, a circular arc, and an ellipse. The existing forms of the texture include continuous texture and discontinuous texture.

[0024] As Figure 1-2 shown, it is a schematic diagram of the texture structure at the outer circular parts at both ends of the oil casing in the make-up and break-out clamping positions. The texture forms include continuous texture and discontinuous texture. Figure 1 It is a schematic diagram of continuous texture, Figure 2 and it is discontinuous texture. Figure 3 It is a schematic diagram of the structure of the mesh texture.

[0025] Figure 4 It is a schematic diagram with a triangular cross-section, Figure 5 and it is Figure 4 an enlarged schematic diagram of A in

[0026] Figure 6 It is a schematic diagram with a circular arc cross-section, Figure 7 and it is Figure 6 an enlarged schematic diagram of B in

[0027] Figure 8 It is a schematic diagram with an elliptical cross-section, Figure 9 and it is Figure 8 an enlarged schematic diagram of C in

[0028] Figure 1-9The cross-sectional tooth height, root fillet, and tip fillet of the texture structure are described as follows. In the figure, both the root and tip of the tooth adopt arc transitions, which can reduce residual processing stress. Among them, the tooth height is <1 mm, the root fillet R ≥ 0.2 mm, and the tip fillet R ≥ 0.1 mm.

[0029] It should be noted that the external circumferential texture structure at both ends of the oil casing is particularly suitable for working conditions with a large make-up and break-out torque of the casing. In the working conditions with a large make-up and break-out torque of the casing, simply relying on increasing the friction force of the non-indentation die plate on the casing unilaterally can no longer complete the task. The increase in the friction force of the non-indentation die plate on the casing unilaterally is limited. Excessive normal stress will cause excessive deformation of the make-up and break-out part of the casing, seriously affecting the make-up and break-out quality. The use of the external circumferential texture structure at both ends of the oil casing significantly increases the friction coefficient of the casing, making the friction force large enough, but the normal stress is not too large, making it a reality to make up and break out the casing with a large torque.

[0030] The structure in this application is simple, with a small texture depth, convenient processing, low cost. The casing has been surface-treated, making it safe and reliable to use. This structure is used in combination with the die plate. The use of the casing with this texture structure significantly increases the friction coefficient, increasing the friction force of the die plate clamping the casing. Due to the large enough friction force, the success rate of the non-indentation die plate clamping the casing is significantly increased, and the damage to the casing is significantly reduced. At the same time, the wear of the die plate is also significantly reduced. Therefore, the replacement times of the die plate are reduced, saving the casing operation time and generating considerable economic benefits. At the same time, due to the large enough friction force, the normal pressure of the non-indentation die plate on the casing can be appropriately reduced, thereby reducing the deformation amount of the make-up and break-out part of the casing, improving the make-up and break-out quality, and improving the airtightness of the pipe string.

[0031] The above shows and describes the basic principles, main features, and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above embodiments. The above embodiments and the descriptions in the specification are only preferred examples of the present utility model and are not used to limit the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

Claims

1. An oil casing pipe for enhancing external clamping force, characterized in that, It includes a casing body (1), and anti-friction texture structures (2) are provided on the outer circular parts at both ends of the casing body (1). The two outer circular parts are located at the positions clamped by making and breaking joints. One end of the casing body is connected to a coupling (3), and the length of the texture structure in the length direction of the oil casing is 30 - 50 mm greater than the length of the coupling.

2. An oil casing for enhancing external clamping force as described in claim 1, characterized in that: The texture depth of the anti-friction texture structure (2) is less than or equal to 1 mm.

3. An oil casing pipe for enhancing external clamping force as described in claim 2, characterized in that: The anti-friction texture structure (2) includes straight lines and reticulate patterns.

4. An oil casing for enhancing external clamping force as described in claim 1, characterized in that: The cross-section of the texture of the anti-friction texture structure (2) is any one or more of a triangle, an arc, and an ellipse.

5. An oil casing for enhancing external clamping force as described in claim 1, characterized in that: The existing forms of the texture of the anti-friction texture structure (2) include continuous textures and discontinuous textures.

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