Connecting device of oil well fracturing pipeline

Abstract

The utility model relates to a connecting device of an oil well fracturing pipeline, which comprises a connecting pipe communicated with the end part of the pipeline, the inner side and the outer side of the connecting pipe are respectively provided with an internal thread and an external thread, the connecting pipe is communicated with a sleeve, the outer side of the sleeve is provided with a thread A matched with the internal thread, and the two ends of the sleeve are respectively sleeved in the connecting pipe; the outer side of the connecting pipe is sleeved with a nut, and the nut is provided with a thread B matched with the external thread; the nuts on the two sides of the sleeve are connected through a spring; force in the axial direction of the connecting pipe is applied to the nut through the spring, so that friction force among the nut, the connecting pipe and the casing pipe is increased, looseness among the nut, the connecting pipe and the casing pipe is prevented, and the device is simple, efficient, safe and reliable.

Description

Technical Field

[0001] The utility model relates to the technical field of fracturing pipelines, in particular to a connecting device for oil well fracturing pipelines. Background Art

[0002] In the oilfield industry, fracturing and production stimulation of oil and gas fields are usually completed using fracturing pipes, and fracturing pipes are connected by fracturing pipe joints. During the fracturing operation, the high-pressure fluid in the fracturing pipe line will cause a large impact force on the pipeline, causing the fracturing pipe joints to vibrate. Existing fracturing pipe joints usually use bolts and nuts to fasten the fracturing pipe, but the bolts and nuts are prone to loosening during the vibration of the joint, resulting in gaps between the fracturing pipe and the joint, and even the joint falling off. Therefore, the fastening device of the joint needs to be checked and adjusted frequently, which seriously affects work efficiency. Therefore, a fracturing pipeline connection device that can prevent the fastening device from loosening is needed. Utility Model Content

[0003] The utility model addresses the deficiencies of the existing technology and provides a connection device for oil well fracturing pipelines, which is simple, efficient, safe, reliable and easy to operate, and wherein a spring applies a force to the nut along the axial direction of the connecting pipe, thereby increasing the friction between the nut, the connecting pipe and the casing, and preventing the nut, the connecting pipe and the casing from loosening.

[0004] The utility model is realized by the following technical scheme, which provides a connecting device for an oil well fracturing pipeline, comprising a connecting pipe connected to an end portion of the pipeline, wherein the inner and outer sides of the connecting pipe are respectively provided with an internal thread and an external thread, the connecting pipe is connected to a casing, the outer side of the casing is provided with a thread A adapted to the internal thread, and the two ends of the casing are respectively sleeved in the connecting pipe; a nut is sleeved on the outer side of the connecting pipe, and the nut is provided with a thread B adapted to the external thread; the nuts on both sides of the casing are connected by a spring; a force along the axial direction of the connecting pipe is applied to the nut by the spring, thereby increasing the friction between the nut, the connecting pipe and the casing, and preventing the nut, the connecting pipe and the casing from loosening.

[0005] As an optimization, a slide rail extending along the axial direction of the sleeve is fixedly provided on the outside of the sleeve, and a number of sliders are slidably provided on the slide rail, and a non-slip surface is provided on the side of the slider facing the adjacent nut; the spring is located between the sliders, and the spring drives the slider to move toward the nut; the spring applies a force to the slider toward the nut, thereby increasing the friction between the slider and the nut, thereby preventing the nut, the connecting pipe and the sleeve from loosening.

[0006] As an optimization, a locking tooth A is provided on the side of the slider facing the adjacent nut, and a locking tooth B matching the locking tooth A is provided on the side of the nut facing the slider; the locking teeth A and B prevent the nut from rotating.

[0007] As an optimization, the slide rails are arranged in sequence along the circumference of the sleeve, and the slider is sleeved on the sleeve; by sleeved on the sleeve, the slider is prevented from being offset.

[0008] As an optimization, the rotation directions of the internal thread and the external thread are opposite; if the connecting pipe and the sleeve are loose, the nut and the connecting pipe are tightened; if the nut and the connecting pipe are loose, the connecting pipe and the sleeve are tightened; the internal thread and the external thread with opposite rotation directions ensure that the nut, the connecting pipe and the sleeve are tightened.

[0009] The beneficial effects of the utility model are as follows: a force is applied to the slider toward the nut by the spring, thereby increasing the friction between the slider and the nut, and at the same time increasing the friction between the connecting pipe and the sleeve, thereby preventing the nut, the connecting pipe and the sleeve from loosening; the locking teeth A and the locking teeth B prevent the nut from rotating, thereby preventing the nut from loosening on the connecting pipe; the internal thread and the external thread with opposite rotation directions ensure that the nut, the connecting pipe and the sleeve are fastened. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a cross-sectional view of the utility model;

[0011] Figure 2 This is a schematic diagram of the structure of the utility model;

[0012] Figure 3 This is a schematic diagram of the slider structure of the utility model;

[0013] Figure 4 This is a schematic diagram of the nut structure of the utility model;

[0014] As shown in the figure:

[0015] 1. Pipeline, 2. Connecting pipe, 3. Casing, 4. Nut, 5. Slider, 6. Spring, 301. Slide rail, 401. Lock tooth B, 501. Lock tooth A. DETAILED DESCRIPTION

[0016] In order to clearly illustrate the technical features of this solution, this solution is described below through specific implementation methods.

[0017] like Figures 1-4The connecting device of the oil well fracturing pipeline of the utility model shown includes a connecting pipe 2 connected to the end of the pipeline 1, and the inner and outer sides of the connecting pipe 2 are respectively provided with internal threads and external threads. The connecting pipe 2 is connected to a casing 3, and the outer side of the casing 3 is provided with a thread A that matches the internal thread, and the two ends of the casing 3 are respectively sleeved in the connecting pipe 2; a nut 4 is sleeved on the outer side of the connecting pipe 2, and a thread B that matches the external thread is opened on the nut 4; the nuts 4 on both sides of the casing 3 are connected by a spring 6; the pipeline 1 and the connecting pipe 2 are fixedly connected; the axes of the pipeline 1, the connecting pipe 2 and the casing 3 are the same; the spring 6 is sleeved on the outside of the collar, and the spring 6 extends axially along the casing 3.

[0018] The sleeve 3 is rotated on the connecting pipe 2 to connect the sleeve 3 to the connecting pipe 2, and the nut 4 is rotated on the connecting pipe 2. The nut 4 moves toward the sleeve 3 until the nut 4 fixes the connecting pipe 2 on the sleeve 3; the spring 6 contracts and applies a force along the axial direction of the connecting pipe 2 to the nut 4, and the friction between the nut 4 and the connecting pipe 2 increases. At the same time, the friction between the connecting pipe 2 and the sleeve 3 increases.

[0019] like Figure 1 and Figure 2 The outer side of the sleeve 3 shown is fixed with a slide rail 301 extending axially along the sleeve 3, and a number of sliders 5 are slidably provided on the slide rail 301, and the slider 5 is provided with an anti-slip surface on the side facing the adjacent nut 4; the spring 6 is located between the sliders 5, and the spring 6 drives the slider 5 to move toward the nut 4; two sliders 5 are slidably provided on the slide rail 301, and the sliders 5 are respectively located at both ends of the slide rail 301.

[0020] The sleeve 3 is rotated on the connecting pipe 2 to connect the sleeve 3 to the connecting pipe 2, and the nut 4 is rotated on the connecting pipe 2. The nut 4 moves toward the slider 5. The slider 5 moves toward each other on the slide rail 301 under the push of the nut 4 until the nut 4 fixes the connecting pipe 2 on the sleeve 3; the spring 6 contracts under the drive of the slider 5 and applies a force to the slider 5 toward the nut 4, the friction between the slider 5 and the nut 4 increases, and at the same time, the friction between the nut 4 and the connecting pipe 2 increases, and the friction between the connecting pipe 2 and the sleeve 3 increases.

[0021] like Figure 2-Figure 4 The slider 5 shown is provided with a locking tooth A501 on the side facing the adjacent nut 4, and the nut 4 is provided with a locking tooth B401 matching the locking tooth A501 on the side facing the slider 5; the locking tooth A501 can be a straight tooth, and the straight tooth is directed along the surface extending axially of the connecting tube 2 in the direction of rotation when the nut 4 rotates toward the slider 5.

[0022] Rotate the sleeve 3 on the connecting pipe 2 and connect the sleeve 3 to the connecting pipe 2, rotate the nut 4 on the connecting pipe 2, the nut 4 moves toward the slider 5, and the slider 5 moves toward each other on the slide rail 301 under the push of the nut 4 until the nut 4 fixes the connecting pipe 2 to the sleeve 3; the nut 4 and the slider 5 are engaged and connected by the lock tooth A501 and the lock tooth B401, and the spring 6 contracts under the drive of the slider 5 to apply a force to the slider 5 to move toward the nut 4, and the friction between the slider 5 and the nut 4 increases. At the same time, the friction between the nut 4 and the connecting pipe 2 increases, and the friction between the connecting pipe 2 and the sleeve 3 increases; when the nut 4 rotates in the direction away from the slider 5, the spring 6 applies a force to the slider 5 to move toward the nut 4, and the slide rail 301 clamps the slider 5 to prevent the slider 5 from deviating, and the lock tooth A501 clamps the lock tooth B401 to prevent the nut 4 from rotating.

[0023] like Figure 2 The slide rails 301 are arranged in sequence along the circumference of the sleeve 3 , and the slider 5 is sleeved on the sleeve 3 .

[0024] The slider 5 slides on the sleeve 3 along the axial direction of the sleeve 3 .

[0025] like Figure 2 The rotation directions of the internal thread and the external thread are opposite; if the connection pipe 2 and the sleeve 3 are loose, the nut 4 and the connection pipe 2 should be tightened more.

[0026] In the actual production process, the sleeve 3 is rotated on the connecting pipe 2 and the sleeve 3 is connected to the connecting pipe 2, and the nut 4 is rotated on the connecting pipe 2. The nut 4 moves toward the slider 5, and the slider 5 moves toward each other on the slide rail 301 under the push of the nut 4 until the nut 4 fixes the connecting pipe 2 to the sleeve 3; the nut 4 and the slider 5 are engaged and connected by the lock tooth A501 and the lock tooth B401. The spring 6 contracts under the drive of the slider 5 and applies a force to the slider 5 to move toward the nut 4. The friction between the slider 5 and the nut 4 increases. At the same time, the friction between the nut 4 and the connecting pipe 2 increases, and the friction between the connecting pipe 2 and the sleeve 3 increases; when the nut 4 rotates in the direction away from the slider 5, the spring 6 applies a force to the slider 5 to move toward the nut 4, and the slide rail 301 clamps the slider 5 to prevent the slider 5 from deviating, and the lock tooth A501 clamps the lock tooth B401 to prevent the nut 4 from rotating.

[0027] Of course, the above description is not limited to the above examples. The technical features not described in the present invention can be achieved through or by adopting existing technologies, and will not be repeated here. The above embodiments and drawings are only used to illustrate the technical solution of the present invention and are not limitations of the present invention. The present invention is described in detail with reference to the preferred implementation methods. Ordinary technicians in this field should understand that the changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention do not depart from the purpose of the present invention and should also fall within the scope of protection of the claims of the present invention.

Claims

1. A connecting device for an oil well fracturing pipeline, comprising a connecting pipe (2) connected to an end of a pipeline (1), wherein the inner and outer sides of the connecting pipe (2) are respectively provided with internal threads and external threads, the connecting pipe (2) is connected to a casing (3), the outer side of the casing (3) is provided with threads A adapted to the internal threads, and the two ends of the casing (3) are respectively sleeved in the connecting pipe (2); characterized in that: A nut (4) is sleeved on the outside of the connecting pipe (2), and a thread B matching the external thread is provided on the nut (4); the nuts (4) on both sides of the sleeve (3) are connected via a spring (6).

2. The connecting device for oil well fracturing pipeline according to claim 1, characterized in that: A slide rail (301) extending axially along the sleeve (3) is fixedly provided on the outer side of the sleeve (3); a plurality of sliders (5) are slidably provided on the slide rail (301); and a side of the slider (5) facing the adjacent nut (4) is provided with an anti-slip surface; a spring (6) is located between the sliders (5), and the spring (6) drives the slider (5) to move toward the nut (4).

3. The connecting device for oil well fracturing pipeline according to claim 2, characterized in that: The slider (5) is provided with a locking tooth A (501) on the side facing the adjacent nut (4), and the nut (4) is provided with a locking tooth B (401) adapted to the locking tooth A (501) on the side facing the slider (5).

4. The connecting device for oil well fracturing pipeline according to claim 2, characterized in that: The slide rails (301) are arranged in sequence along the circumference of the sleeve (3), and the slider (5) is sleeved on the sleeve (3).

5. The connecting device for oil well fracturing pipeline according to claim 1, characterized in that: The internal and external threads rotate in opposite directions.

Images