An expansion tool for a pipe body

Abstract

The present application belongs to the field of oil and gas field drilling, and particularly relates to an expansion tool for a pipe body. The expansion tool comprises a driving assembly, a base, and an expansion assembly. The driving assembly comprises a sleeve arranged at the top and a piston member connected with the sleeve. The expansion assembly comprises a first connecting rod, a group of second connecting rods, and a third connecting rod. The piston member is configured to move longitudinally to cause the sleeve to move, so as to drive the third connecting rod to move radially outward relative to the base through the first connecting rod and the second connecting rods. The present application can effectively prolong the service life of the joint of the downhole pipe, and improve the production efficiency of the oil and gas field. In addition, the present application also has good application value.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of oil and gas field drilling, in particular to an expanding tool for pipe body. BACKGROUND

[0002] For the oil and gas exploitation industry, the quality of pipe connection technology directly affects the safety of construction. A large amount of practical data shows that in the process of oil and gas exploitation, due to the complex working conditions underground, the inner wall of the oil pipe is prone to wear, corrosion or blockage, etc., which leads to the need for frequent repair and dredging of the pipeline. At the same time, the frequent accidents often concentrate in the connection part of the pipeline. Therefore, a kind of efficient and reliable pipe connection technology is of great significance to the oil and gas exploitation industry.

[0003] CN106925683A discloses a fuel assembly framework whole expanding device, which includes an expanding assembly, a lifting assembly, a support and a positioning assembly. The support is located at the lowermost end and supports the whole expanding device. The lifting assembly is arranged on the support and can lift and drive the expanding assembly and the positioning assembly to lift together. The positioning assembly is arranged at the front end of the lifting assembly and is used for positioning the position to be expanded. The expanding assembly is also arranged on the lifting assembly. The expanding assembly includes a plurality of expanding pipes, each of which can independently complete an expanding. The expanding sleeve in this scheme has a limited opening angle, which is only suitable for small amplitude expanding and cannot adapt to the connection of the downhole pipe string. In addition, patents CN211161567U and CN102794369B also cannot solve the above problems. SUMMARY

[0004] The purpose of the present application is to provide an expanding tool for pipe body, which can effectively expand the pipe of different thicknesses, thereby prolonging the service life of the downhole pipe joint and improving the production efficiency of the oil and gas field. In addition, the present application also has good application value.

[0005] According to the present application, an expanding tool for pipe body is provided, which comprises a driving assembly, the driving assembly comprising a sleeve arranged at the top, a piston member fixedly connected with the sleeve, a base sleeved on the outer wall surface of the piston member, and an expanding assembly capable of being driven by the driving assembly and used for widening the inner wall of the pipe body, the expanding assembly comprising a first connecting rod fixedly connected with the sleeve, a group of second connecting rods fixedly connected with the first connecting rod and the base respectively, and a third connecting rod fixedly connected with the second connecting rod, wherein the piston member is configured to move longitudinally to facilitate the movement of the sleeve, so as to drive the third connecting rod to move radially outward relative to the base through the first connecting rod and the second connecting rod.

[0006] In one embodiment, the third connecting rod is arranged in parallel with the base.

[0007] In one embodiment, the third connecting rod comprises a shaped rod with an arc-shaped top and a cross rod with an opening in the top, wherein the shaped rods and the cross rods are alternately arranged circumferentially on the outer periphery of the base.

[0008] In one embodiment, the shaped rods and the cross rods are arranged on the outer periphery of the base by the second connecting rod.

[0009] In one embodiment, the shaped rods and the cross rods are arranged in axial central symmetry.

[0010] In one embodiment, the cross rod comprises a support arranged inside, wherein a protruding tooth protruding out of the opening is arranged in the support, and a gasket capable of changing the protruding length of the tooth is arranged inside the support.

[0011] In one embodiment, the opening comprises a plurality of expansion portions for placing the tooth, and a connecting portion connecting any two adjacent expansion portions, wherein the expansion portions are evenly arranged on the cross rod.

[0012] In one embodiment, the tooth is configured as a column, and the top of the tooth is configured as any one of a sphere or an ellipse.

[0013] In one embodiment, the base, the third connecting rod and the group of second connecting rods form a parallelogram hinge mechanism.

[0014] In one embodiment, the sleeve is fixedly connected to the end of the piston member by a pin, so that the sleeve can move in the longitudinal direction by the driving of the piston member. BRIEF DESCRIPTION OF DRAWINGS

[0015] The present application will be described in detail below with reference to the accompanying drawings, in which:

[0016] Figure 1 A structural schematic diagram of the expansion tool for pipe body according to the present application is shown schematically;

[0017] Figure 2 A structural schematic diagram of the shaped rod in the expansion tool for pipe body is shown;

[0018] Figure 3 A structural schematic diagram of the cross rod in the expansion tool for pipe body is shown;

[0019] Figure 4 A Figure 1 A sectional view of A-A in FIG. 4, which specifically shows the arrangement of the shaped rod and the cross rod;

[0020] Figure 5 This is a cross-sectional view of the crossbar in the expansion joint tool used for pipe bodies, showing the positional relationship between the protruding teeth and the crossbar.

[0021] In the accompanying drawings, the same parts use the same reference numerals. The drawings are not drawn to scale. Detailed Implementation

[0022] The invention will now be further described with reference to the accompanying drawings.

[0023] Figure 1 A schematic diagram of the structure of an expansion tool 100 for a pipe body according to the present invention is shown. Figure 1 As shown, the pipe expansion tool 100 according to the present invention includes a drive assembly 10, a base 20, and an expansion assembly 30. The drive assembly 10 provides power to the pipe expansion tool 100, causing the expansion assembly 30 to expand or contract within the pipe (the same concept as in the hereinafter referred to as a pipe, not shown in the figures). The base 20 is sleeved on the outer wall of the drive assembly 10, providing fixed support for the expansion assembly 30. The expansion assembly 30 is fixedly connected to both the base 20 and the drive assembly 10. Furthermore, the expansion assembly 30, driven by the drive assembly 10, completes the expansion of the pipe.

[0024] According to the present invention, such as Figure 1 As shown, the drive assembly 10 includes a sleeve 11 and a piston 12. The sleeve 11 is located at the top of the drive assembly 10 and is fixedly connected to the expansion joint assembly 30. The piston 12 is located at the bottom of the drive assembly 10 and is fixedly connected to the sleeve 11. Additionally, a base 20 is sleeved on the outer wall of the piston 12 and is fixedly connected to the expansion joint assembly 30.

[0025] In one embodiment of the present invention, the piston 12 is capable of moving longitudinally, thereby driving the sleeve 11 to move longitudinally, and thus causing the expansion assembly 30 to expand or contract within the pipe.

[0026] According to the present invention, such as Figure 1As shown, the expansion joint assembly 30 includes a first connecting rod 31, a second connecting rod 32, and a third connecting rod 40. One end of the first connecting rod 31 is hinged to the outer wall of the sleeve 11, and the other end is hinged to the middle portion of the second connecting rod 32. Thus, the sleeve 11 can drive the first connecting rod 31 to move, thereby enabling the first connecting rod 31 to push / pull the second connecting rod 32. The second connecting rod 32 is hinged longitudinally to both the third connecting rod 40 and the sleeve 11, and laterally to the first connecting rod 31. Therefore, during the movement of the first connecting rod 31 driven by the sleeve 11, the second connecting rod 32 and the third connecting rod 40 can completely follow the movement of the first connecting rod 31.

[0027] In one embodiment of the present invention, the third connecting rod 40 is arranged parallel to the base 20, and the third connecting rod 40 moves radially outward relative to the base 20 under the combined drive of the first connecting rod 31 and the second connecting rod 32. Specifically, the third connecting rod 40 applies an outward pushing force to the inner wall of the pipe, thereby causing the pipe to expand and extend outward.

[0028] According to the present invention, the third connecting rod 40 includes a shaping rod 50. Figure 2 This is a schematic diagram of the shaping rod 50 in the expansion tool 100 used for pipe bodies. Figure 2 As shown, the top of the shaping rod 50 is configured as an arc surface. The top of the shaping rod 50 can effectively fit against the inner wall surface of the pipe. Therefore, when the third connecting rod 40 moves radially outward relative to the base 20, the top of the shaping rod 50 can uniformly press against the inner wall surface of the pipe.

[0029] According to the present invention, the third connecting rod 40 further includes a crossbar 60. Figure 3 This is a schematic diagram of the crossbar 60 in the expansion tool 100 used for pipe bodies. Figure 3 As shown, the top of the crossbar 60 has an opening 61. Furthermore, the crossbar 60 includes an internal support 62. The support 62 has protruding teeth 70 installed inside it. Figure 5 This is a cross-sectional view of the crossbar 60 in the expansion tool 100 for pipe bodies, specifically showing the positional relationship between the protruding teeth 70 and the crossbar 60. For example... Figure 5 As shown, the protruding tooth 70 can extend from the opening 61 at the top of the crossbar 60. Thus, when the third connecting rod 40 moves radially outward relative to the base 20, the protruding tooth 70 can apply an outward pushing force to the inner wall of the pipe. A gasket 63 is also provided inside the support 62. By increasing or decreasing the number of gaskets 63, the length of the protruding tooth 70 extending from the opening 61 is changed, thereby adjusting the force of the expansion tool 100 on the inner wall of the pipe to accommodate pipes of different thicknesses.

[0030] According to the present application, as shown in Figure 3 The opening 61 includes a plurality of expansion portions 611 capable of placing the protrusions 70, and connecting portions 612 connecting any two adjacent expansion portions 611. The expansion portions 611 are uniformly arranged on the crossbar 60. That is, the protrusions 70 are spaced apart from each other. In this way, the expansion tool 100 for the pipe body is more flexible in the expansion operation of the pipe.

[0031] In an embodiment of the present application, the protrusions 70 are configured in a columnar structure. The top of the protrusion 70 includes, but is not limited to, one of a spherical shape and an elliptical shape. In this way, when the third connecting rod 40 moves radially outward relative to the base 20, the protrusions 70 have a greater extrusion force on the inner wall of the pipe. In this way, the expansion tool 100 for the pipe body can more easily perform the expansion work on the pipe.

[0032] In another embodiment of the present application, when the third connecting rod 40 moves radially outward relative to the base 20, the protrusions 70 arranged on the crossbar 60 first extrude the inner wall of the pipe. Subsequently, the area where the protrusions 70 contact the inner wall deforms outwardly, and the areas on both sides of the area deform inwardly.

[0033] In order to avoid the above problems. Figure 4 For Figure 1 The cross-sectional view of the A-A plane specifically shows the arrangement of the shaping rods 50 and the crossbars 60. In an embodiment of the present application, as shown in Figure 4 The shaping rods 50 and the crossbars 60 are alternately arranged on the outer periphery of the base 20 in a circumferential direction, and the shaping rods 50 and the crossbars 60 are both arranged symmetrically along the axial center. In this way, the crossbars 60 extrude outwardly while the shaping rods 50 also extrude outwardly. In this way, the shaping rods 50 can effectively limit the wall on both sides of the area where the protrusions 70 contact the inner wall, thereby preventing the wall of the pipe from contracting inwardly, and ensuring that the wall of the pipe can simultaneously expand outwardly as a whole, thereby being more beneficial to the uniform expansion work of the pipe.

[0034] In a specific embodiment of the present application, the shaping rods 50 and the crossbars 60 are arranged on the outer periphery of the base 20 by the second connecting rods 32. In this way, the base 20, the third connecting rod 40, and the group of second connecting rods 32 form a parallelogram hinge mechanism. Through the above-mentioned parallelogram hinge mechanism, the expansion tool 100 for the pipe body can more easily perform the expansion work on the pipe.

[0035] In an embodiment of the present application, the sleeve 11 is fixedly connected to the end of the piston 12 by the pin 13.

[0036] The hydraulic mechanism composed of the sleeve 11 and the piston piece 12 and the linkage mechanism composed of the first connecting rod 31, the second connecting rod 32 and the third connecting rod 40 are cooperated to complete the expansion joint work of the pipeline, thereby prolonging the service life of the joint of the downhole pipeline and improving the efficiency of the oil and gas field production

[0037] The above merely describes the preferred embodiments of the present application, but the protection scope of the present application is not limited thereto. Those skilled in the art can easily make changes or modifications within the disclosure of the present application, and such changes or modifications shall be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. An expanding tool (100) for pipe body, comprising: a driving assembly (10) comprising a sleeve (11) arranged at the top and a piston member (12) fixedly connected with the sleeve (11), a base (20) sleeved on the outer wall surface of the piston member (12), and an expanding assembly (30) capable of being driven by the driving assembly (10), the expanding assembly (30) comprising a first connecting rod (31) fixedly connected with the sleeve (11), a group of second connecting rods (32) fixedly connected with the first connecting rod (31) and the base (20) respectively, and a third connecting rod (40) fixedly connected with the second connecting rod (32) and used for widening the inner wall of the pipe body, wherein the piston member (12) is configured to move longitudinally to cause the sleeve (11) to move, thereby driving the third connecting rod (40) to move radially outward relative to the base (20) through the first connecting rod (31) and the second connecting rod (32), the third connecting rod (40) comprising a shaping rod (50) arranged as an arc at the top and a cross rod (60) provided with an opening (61) at the top, wherein the shaping rod (50) and the cross rod (60) are alternately arranged on the outer periphery of the base (20) in the circumferential direction, the shaping rod (50) and the cross rod (60) are both arranged in axial central symmetry, the cross rod (60) comprises a support (62) arranged inside, and a protruding tooth (70) protruding out of the opening (61) is mounted in the support (62), the inner wall surface of the pipe is first extruded by the protruding tooth (70) on the cross rod (60) to cause the contacted area to be deformed outwardly, the wall surfaces on both sides of the area contacted by the protruding tooth (70) and the inner wall surface are effectively limited by the shaping rod (50), 2. A tool for expanding a tube according to claim 1, wherein a gasket (63) capable of changing the protruding length of the protruding tooth (70) is further arranged inside the support (62), the protruding length of the protruding tooth (70) from the opening (61) is changed by increasing or decreasing the number of gaskets (63), thereby adjusting the intensity of the expansion tool for pipe body to expand the inner wall of the pipe.

3. A tool for expanding a tube according to claim 2, wherein The third connecting rod (40) is arranged in parallel with the base (20).

4. The expansion tool for a pipe body according to claim 3, characterized by The shaping rod (50) and the cross rod (60) are arranged on the outer periphery of the base (20) through the second connecting rod (32).

5. A tool for expanding a tube end according to claim 4, wherein The opening (61) comprises a plurality of expansion portions (611) for placing the protruding tooth (70) and a connecting portion (612) connecting any two adjacent expansion portions (611), wherein the expansion portions (611) are uniformly arranged on the cross rod (60).

6. A tool for expanding a tube end according to claim 5, wherein The protruding tooth (70) is configured as a column, and the top thereof is arranged as any one of a sphere or an ellipse. The base (20), the third connecting rod (40), and the group of second connecting rods (32) form a parallelogram hinge mechanism.

7. A tool for expanding a tube according to claim 6, wherein The sleeve (11) is fixedly connected with the end of the piston member (12) through a pin (13), so that the sleeve (11) can move in the longitudinal direction by the driving of the piston member (12).

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