Drill rod capable of being used as casing pipe

Abstract

The utility model relates to the technical field of drill rods, and discloses a drill rod capable of being used as a sleeve. A first step surface and a second step surface are arranged in a pin cylinder part, and a first circular bead and a second circular bead which correspond to the first step surface and the second step surface respectively are arranged at a sleeve part, so that the first circular bead and the first step surface are connected in a sleeving manner; a first seal and a second seal are respectively formed between the second shoulder and the second step surface, and a third seal is formed through joint matching of the external thread at the pin cylinder part and the internal thread at the sleeve part. Fourth sealing can be achieved between the inner wall of the sleeve component and the outer wall of the pin cylinder component through the elastic extrusion piece, and then the sealing effect between the drill rods is greatly improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of drill pipes, in particular to a drill pipe capable of being used as a casing pipe. BACKGROUND

[0002] Drill pipes are usually used to connect surface equipment such as drilling machines located on the ground and drilling equipment or bottom hole devices located at the bottom of a well, and cooperate with drill bits to perform drilling operations. In the field of oil production, oil drill pipes are one of the indispensable important tools in oil drilling operations.

[0003] The two ends of a drill pipe are respectively provided with a pin barrel part and a box barrel part, and the connection of two adjacent drill pipes is achieved by inserting the pin barrel into the box barrel. The pin barrel and the box barrel in the prior art are respectively provided with external threads and internal threads, and the sealing effect is general. Patent No. 01110348358.X discloses a double-step threaded connection for connecting well drilling pipes. By adopting a unique double-step design, the first step surface and the second step surface are matched with the first shoulder and the second shoulder respectively, thereby achieving the purpose of enhancing the sealing effect. To some extent, this patent enhances the sealing effect between drill pipes, but in some specific use scenarios, such as using the drill pipe as a casing pipe, the sealing performance still cannot meet the use requirements. CONTENT OF THE UTILITY MODEL

[0004] In view of the above problems, the present application provides a drill pipe capable of being used as a casing pipe, which can greatly improve the sealing effect between drill pipes, thereby making it possible to use the drill pipe as a casing pipe, and further saving a large amount of drilling costs.

[0005] According to an aspect of an embodiment of the present application, a drill pipe capable of being used as a casing pipe is provided. The drill pipe capable of being used as a casing pipe comprises a drill pipe body, two ends of the drill pipe body are provided with a female-male joint, the female-male joint is respectively a box barrel part and a pin barrel part, the drill pipe body, the box barrel part and the pin barrel part are all hollow structures, the pin barrel part is used for being inserted into the box barrel part to realize the sequential connection of multiple drill pipe bodies, a first step surface and a second step surface are sequentially provided on the pin barrel part in a direction away from the drill pipe body, an external thread is provided between the second step surface to the end of the pin barrel part and the first step surface to the second step surface on the outer periphery of the pin barrel part, a reserved slot is opened at one end of the outer periphery of the pin barrel part close to the drill pipe body, an elastic extrusion piece is arranged in the reserved slot, a first shoulder and a second shoulder matched with the first step surface and the second step surface are respectively arranged at the inner wall of the box barrel part, and an internal thread is opened at the second shoulder to the end of the box barrel part and the first shoulder to the second shoulder.

[0006] In some embodiments, the elastic extrusion member comprises a steel ball, the preformed hole is a spherical groove, and the inner bottom of the spherical groove is connected to the outer sidewall of the steel ball by a spring.

[0007] In some embodiments, the elastic member is a semi-circular solid high-strength polyurethane, and the preformed groove matches the elastic member.

[0008] In some embodiments, the elastic member is a spindle-shaped solid high-strength polyurethane, and the preformed groove matches the elastic member.

[0009] In some embodiments, the outer diameter of the pin barrel part gradually decreases from the second step surface to the end of the pin barrel part.

[0010] The beneficial effects in the present application are: by setting the first step surface and the second step surface in the pin barrel part and setting the first shoulder and the second shoulder corresponding to the first step surface and the second step surface respectively in the sleeve part, and then forming the first seal and the second seal between the first shoulder and the first step surface and between the second shoulder and the second step surface respectively, forming the third seal by the outer thread of the pin barrel part and the inner thread of the sleeve part, and setting the elastic extrusion member, so that when the sleeve part and the pin barrel part are connected, the inner wall of the sleeve part and the outer wall of the pin barrel part can realize the fourth seal through the elastic extrusion member, thereby greatly improving the sealing effect between the drill pipes.

[0011] The above description is only a summary of the technical solutions of the present application, in order to more clearly understand the technical means of the present application, the specific embodiments of the present application can be implemented according to the content of the specification, and in order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0012] By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of illustrating the preferred embodiments and are not considered as limiting the present application. Moreover, the same reference symbols are used throughout the drawings to represent the same parts. In the drawings:

[0013] Figure 1 The overall structure of the drill pipe provided by the embodiments of the present application is shown in the schematic diagram;

[0014] Figure 2 The cross-sectional structure of the elastic extrusion member in two forms provided by the embodiments of the present application is shown in the schematic diagram.

[0015] The reference numerals in the specific embodiments are as follows:

[0016] Drill pipe 100, drill pipe body 110, pin barrel part 120, first step surface 121, second step surface 122, external thread 123, reserved groove 124, elastic extrusion piece 125, steel ball 125a, spring 125b, sleeve part 130, first shoulder 131, second shoulder 132, internal thread 133. DETAILED DESCRIPTION

[0017] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as understood by those skilled in the art to which the present application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and their specific terms in the specification and claims of the present application and the above description of drawings mean "comprise". Figure 1The drill pipe 100 which can be used as casing pipe comprises a drill pipe body 110 which will be used as casing pipe after subsequent use and will be left below the ground, and the strength requirement of the drill pipe is greater than that of the casing pipe, so the drill pipe can be set according to the existing drill pipe strength. The drill pipe body 110 is provided with a female-male joint at both ends, which is a sleeve part 130 and a pin part 120, and the outer diameter of the pin part 120 gradually decreases from the second step surface 122 to the end of the pin part 120. During drilling, the drill pipes are connected in sequence above the ground, and after the connection of a drill pipe, the drill pipe is drilled into the ground and connected with the next drill pipe, and the drilling operation is completed in this way, and the adjacent two drill pipes are connected through the sleeve part 130 and the pin part 120. The drill pipe body 110, the sleeve part 130 and the pin part 120 are all hollow structures, the pin part 120 is used to be inserted into the sleeve part 130 to realize the connection of the drill pipe body 110 in sequence, the pin part 120 is provided with a first step surface 121 and a second step surface 122 in sequence in the direction away from the drill pipe body 110, and the outer periphery of the pin part 120 is provided with an external thread 123 between the second step surface 122 and the end of the pin part 120 and between the first step surface 121 and the second step surface 122, after the connection of the sleeve part 130 and the pin part 120, the first step surface 121 will abut on the first shoulder 131, and the second step surface 122 will lap on the second shoulder 132 to complete double sealing. The starting tooth of the external thread 123 of the outer periphery of the pin part 120 is provided with a reserved groove 124 at one end close to the drill pipe body 110, and the reserved groove 124 is provided with an elastic extrusion part 125, when the sleeve part 130 and the pin part 120 are connected, the elastic part will be extruded by the inner wall of the sleeve part 130, and then the gap between the internal thread 133 and the external thread 123 can be closed to complete the third sealing, the inner wall of the sleeve part 130 is provided with a first shoulder 131 and a second shoulder 132 matched with the first step surface 121 and the second step surface 122 respectively, the internal thread 133 is opened at the second shoulder 132 to the end of the sleeve part 130 and at the first shoulder 131 to the second shoulder 132, and the internal thread 133 and the external thread 123 between the pin part 120 and the sleeve part 130 match each other to produce the fourth sealing.

[0018] From the above, in the embodiment of the present application, by setting the first step surface 121 and the second step surface 122 in the pin barrel component 120 and setting the first shoulder 131 and the second shoulder 132 corresponding to the first step surface 121 and the second step surface 122 respectively at the sleeve component 130, and then forming the first seal and the second seal between the first shoulder 131 and the first step surface 121 and between the second shoulder 132 and the second step surface 122 respectively, and by the outer thread 123 at the pin barrel component 120 and the inner thread 133 at the sleeve component 130 fitting together to form the third seal, and by setting the elastic extrusion piece 125, when the sleeve component 130 and the pin barrel component 120 are connected, the inner wall of the sleeve component 130 and the outer wall of the pin barrel component 120 can realize the fourth seal through the elastic extrusion piece 125, thereby greatly improving the sealing effect between the drill pipes.

[0019] In some embodiments, the elastic extrusion piece 125 includes a steel ball 125a, the reserved hole is a spherical groove, and the inner bottom of the spherical groove is connected to the outer side wall of the steel ball 125a through a spring 125b. In the embodiment of the present application, a specific setting mode of the elastic extrusion piece 125 is provided, which is to set the spherical groove and the steel ball 125a and the spring 125b in the spherical groove to form the elastic extrusion piece 125. When the inner thread 133 of the sleeve component 130 slides through the initial tooth position of the outer thread 123 of the pin barrel component 120, the steel ball 125a will close the gap between the inner thread 133 and the outer thread 123 under the push of the spring 125b. In the embodiment of the present application, the steel ball 125a and the spring 125b are set as the elastic extrusion piece 125, and the material of the steel ball 125a and the spring 125b is the same as that of the drill pipe, which can help to ensure the rigidity of the drill pipe as a whole.

[0020] In some embodiments, please refer to Figure 2 , Figure 2 The cross-sectional structure of the elastic extrusion piece in the two forms provided in the embodiment of the present application is shown in the figure. The elastic piece is a semi-circular ring-shaped solid high-strength polyurethane (such as Form 1 in Figure 2 ) or a spindle-shaped solid high-strength polyurethane (such as Form 2 in Figure 2 ), and the reserved groove 124 matches the elastic piece. High-strength polyurethane is used as the elastic extrusion piece 125 for sealing, and high-strength polyurethane has a certain elastic deformation and can adaptively deform to adjust according to the gap between the sleeve component 130 and the pin barrel component 120, so as to better fit the gap between the inner thread 133 and the outer thread 123, and the sealing effect is better.

[0021] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A drill pipe that can be used as a casing, comprising a drill pipe body, wherein both ends of the drill pipe body are provided with male and female openings, the male and female openings being a sleeve component and a pin component, respectively, characterized in that, The drill pipe body, the sleeve component, and the pin cylinder component are all hollow structures. The pin cylinder component is used to be inserted into the sleeve component to achieve the sequential connection of multiple drill pipe body sections. The pin cylinder component is provided with a first step surface and a second step surface in sequence along the direction away from the drill rod body. The outer periphery of the pin cylinder component is provided with external threads from the second step surface to the end of the pin cylinder component and from the first step surface to the second step surface. A reserved groove is provided on the outer periphery of the pin cylinder component at the end of the starting tooth of the external thread near the drill rod body. An elastic extrusion member is provided in the reserved groove. The inner wall of the sleeve component is provided with a first shoulder and a second shoulder that match the first step surface and the second step surface respectively. The second shoulder to the end of the sleeve component and the first shoulder to the second shoulder are both provided with internal threads.

2. A drill pipe that can be used as a casing according to claim 1, characterized in that, The elastic extrusion component includes a steel ball, and the reserved hole is a spherical groove. The inner bottom of the spherical groove is connected to the outer wall of the steel ball by a spring.

3. A drill pipe that can be used as a casing according to claim 1, characterized in that, The elastic element is a semi-circular solid high-strength polyurethane, and the reserved groove matches the elastic element.

4. A drill pipe that can be used as a casing according to claim 1, characterized in that, The elastic element is a spindle-shaped solid high-strength polyurethane, and the reserved groove matches the elastic element.

5. A drill pipe that can be used as a casing according to claim 1, characterized in that, The outer diameter of the pin cylinder component gradually decreases from the second stepped surface to the end of the pin cylinder component.

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