Abrasion and resistance reducing device for downhole tool

Abstract

The utility model discloses a wear and drag reduction device for downhole tools, which comprises an upper joint, a stator, a rotor, a turbine, a valve assembly and a lower joint, the stator is of a tubular structure, one end of the stator is fixedly connected with one end of the upper joint, the other end of the upper joint is the downhole tools, the rotor is arranged in the middle of the stator, and the turbine is arranged in the lower joint. The rotor is rotationally connected with the inner wall of the stator through the turbine, the valve assembly is arranged in the other end of the stator, one end of the rotor is connected with the control end of the valve assembly, and the exterior of the other end of the stator is fixedly connected with one end of the lower connector. The utility model has the characteristics of high concentricity, high rotating speed, high pressure difference and high vibration amplitude, solves the problems of complex structure, unobvious wear-reducing and resistance-reducing effect, short service life, frequent replacement and maintenance, increase of the cost and workload of drilling engineering and the like of a wear-reducing and resistance-reducing tool in the prior art, improves the drilling efficiency and reduces the construction cost. And the drilling time is greatly shortened.

Description

Technical Field

[0001] The utility model relates to an auxiliary equipment for oil drilling, in particular to a friction and drag reducing device for downhole tools. Background Art

[0002] With the widespread application of highly deviated wells and horizontal wells in the oil and gas industry, especially the increasing depth of horizontal drilling, the friction between the drill string and the tool string and the well wall or the inner wall of the casing has become increasingly prominent. This friction has seriously affected the drilling speed and sometimes even caused the pipe string to bend or lock. In order to solve these problems, many companies at home and abroad have developed friction and drag reduction tools based on different principles to reduce the friction between the drill tool and the well wall and improve drilling efficiency.

[0003] The commonly used friction and drag reduction tools currently have the following problems: first, most of these tools require axial movement of the pipe string and have a complex structure, which brings certain difficulties to operation; second, the friction and drag reduction effect is not obvious and cannot achieve the expected effect of reducing friction resistance; third, due to the complex structure, the service life of these tools is usually short and requires frequent replacement and maintenance, which increases the cost and workload of drilling projects.

[0004] In order to solve these problems, it is necessary to further improve the design and manufacturing of friction and drag reduction tools, simplify the structure, reduce tool components, and improve the stability and reliability of the tools. Research and testing of friction and drag reduction tools can be strengthened to ensure that their effects and performance in practical applications meet expectations.

[0005] In summary, further research and improvement are needed to address the problems of the currently commonly used friction and drag reduction tools in order to improve the effectiveness and life of the tools and better meet the needs of oil and gas drilling projects. Summary of the invention

[0006] The utility model aims to provide a friction and drag reducing device for downhole tools.

[0007] In order to achieve the above-mentioned purpose, the utility model is implemented according to the following technical scheme:

[0008] The utility model comprises an upper joint, a stator, a rotor, a turbine, a valve assembly and a lower joint, wherein the stator is a tubular structure, one end of the stator is fixedly connected to one end of the upper joint, the other end of the upper joint is connected to a downhole tool, the rotor is arranged in the middle of the stator, the rotor is rotatably connected to the inner wall of the stator through the turbine, the valve assembly is arranged inside the other end of the stator, one end of the rotor is connected to the control end of the valve assembly, and the other end of the stator is fixedly connected to one end of the lower joint.

[0009] Preferably, both ends of the rotor are rotatably connected to the inner wall of the stator through a first bearing and a second bearing respectively.

[0010] Preferably, there are multiple turbines, and each of the multiple turbines is connected between the rotor and the stator.

[0011] Furthermore, the valve assembly includes a movable valve, a nozzle, and a static valve, one end of the movable valve is fixedly connected to one end of the rotor, the end of the rotor connected to the movable valve is a hollow structure, and the inside of the movable valve is communicated with the outside of the rotor, the static valve is fixedly connected to the lower joint, the outlet positions of the static valve and the nozzle are provided with mutually staggered outlets, the movable valve and the static valve are rotationally connected by interference fit, the side of the movable valve and the side of the static valve are provided with outlets with corresponding positions, the side outlet position of the static valve is fixedly connected to one end of the nozzle, and the other end of the nozzle is communicated with the outside of the lower joint.

[0012] As an improvement, a protective tube is provided on the outer wall of the lower joint, the protective tube is located at the position where the nozzle is installed, a through hole is provided on the protective tube, and the position of the through hole on the protective tube corresponds to the position of the nozzle.

[0013] The beneficial effects of the utility model are:

[0014] The utility model is a friction and drag reduction device for downhole tools. Compared with the prior art, the utility model has the characteristics of high concentricity, fast rotation speed, high pressure difference and high vibration amplitude. It solves the problems of complex structure of friction and drag reduction tools in the prior art, unobvious friction and drag reduction effect, usually short service life, frequent replacement and maintenance, increased cost and workload of drilling projects, etc., improves drilling efficiency and greatly shortens drilling time. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the cross-sectional structure of the utility model;

[0016] Figure 2 This is a schematic diagram of the valve structure of the utility model;

[0017] Figure 3 It is a schematic diagram of the nozzle structure of the utility model;

[0018] Figure 4 It is a schematic diagram of the cross-sectional structure of the valve part of the utility model;

[0019] Figure 5 It is a schematic diagram of the external structure of the utility model.

[0020] In the figure: upper joint 1, stator 2, rotor 3, first bearing 4, turbine 5, second bearing 6, moving valve 7, nozzle 8, static valve 9, protective tube 10, lower joint 11. DETAILED DESCRIPTION

[0021] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. The schematic embodiments and descriptions of the present invention are used to explain the present invention but are not intended to limit the present invention.

[0022] like Figure 1-5 As shown: the utility model includes an upper joint 1, a stator 2, a rotor 3, a turbine 5, a valve assembly and a lower joint 11, the stator 2 is a tubular structure, one end of the stator 2 is fixedly connected to one end of the upper joint 1, the other end of the upper joint 1 is connected to a downhole tool, the rotor 3 is arranged in the middle of the stator 2, the rotor 3 is rotatably connected to the inner wall of the stator 2 through the turbine 5, the valve assembly is arranged inside the other end of the stator 2, one end of the rotor 3 is connected to the control end of the valve assembly, and the other end of the stator 2 is fixedly connected to one end of the lower joint 11.

[0023] Preferably, two ends of the rotor 3 are rotatably connected to the inner wall of the stator 2 via a first bearing 4 and a second bearing 6 respectively.

[0024] Preferably, there are multiple turbines 5 , and each of the multiple turbines 5 is connected between the rotor 3 and the stator 2 .

[0025] Further, the valve assembly includes a movable valve 7, a nozzle 8, and a static valve 9, one end of the movable valve 7 is fixedly connected to one end of the rotor 3, the end of the rotor 3 connected to the movable valve 7 is a hollow structure, and the inside of the movable valve 7 is communicated with the outside of the rotor 3, the static valve 9 is fixedly connected to the lower joint 11, and the outlet positions of the static valve 9 and the nozzle 8 are provided with mutually staggered outlets, the movable valve 7 and the static valve 9 are rotationally connected by interference fit, the side of the movable valve 7 and the side of the static valve 9 are provided with outlets of corresponding positions, the side outlet position of the static valve 9 is fixedly connected to one end of the nozzle 8, and the other end of the nozzle 8 is communicated with the outside of the lower joint 11.

[0026] As an improvement, a protective tube 10 is provided on the outer wall of the lower joint 11 , and the protective tube 10 is located at the position where the nozzle 8 is installed. A through hole is provided on the protective tube 10 , and the position of the through hole on the protective tube 10 corresponds to the position of the nozzle 8 .

[0027] The working principle of the utility model is as follows: the upper joint 1 is connected to the stator 2 through a thread, the stator 2 and the turbine 5, and the rotor 3 provide rotational power for the entire tool; the turbine 5 is connected to the rotor 3 through a key, and the rotor 3 is connected to the movable valve 7 through a thread, so as to transmit the rotational torque to the movable valve 7, and the movable valve 7 forms different flow cross sections with the static valve 9 and the nozzle 8 through relative rotation, thereby generating different fluid pressure differences to generate axial movement, and the rotor 3, the turbine 5, the movable valve 7 and the first bearing 4 together form a rotary assembly; the movable valve 7 performs relative rotational movement relative to the static valve 9 and the nozzle 8 and forms a fluid passage; the fluid such as water enters the tool through the inner flow channel of the upper joint 1, and is discharged from the tool from the inner flow channels of the nozzle 8 and the lower joint 11. Since multiple turbines 5, stators 2, and carbide bearing groups are used as power transmission components, and the nozzle 8 and the static valve 9 are used as discharge components, the utility model has the characteristics of coaxial rotation between the turbine and the housing, and at the same time, the oscillation force is generated by the change of the cross-sectional area of ​​the movable valve and the static valve. When the flow area of ​​the movable and static valves is the largest, the nozzle is opened. When the flow area is the smallest, it is completely closed. It has the characteristics of fast speed, high pressure difference and high vibration amplitude. It solves the problems of complex structure of friction and drag reduction tools and unclear friction and drag reduction effects in the existing technology, improves drilling efficiency and greatly shortens drilling time.

[0028] The above shows and describes the basic principle and main features of the utility model and the advantages of the invention. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the invention, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A friction and drag reducing device for downhole tools, characterized in that: The invention comprises an upper joint (1), a stator (2), a rotor (3), a turbine (5), a valve assembly and a lower joint (11); the stator (2) is a tubular structure; one end of the stator (2) is fixedly connected to one end of the upper joint (1); the other end of the upper joint (1) is connected to a downhole tool; the rotor (3) is arranged in the middle of the stator (2); the rotor (3) is rotatably connected to the inner wall of the stator (2) through the turbine (5); the valve assembly is arranged inside the other end of the stator (2); one end of the rotor (3) is connected to the control end of the valve assembly; the other end of the stator (2) is fixedly connected to one end of the lower joint (11).

2. The friction and drag reducing device for downhole tools according to claim 1, characterized in that: The two ends of the rotor (3) are rotatably connected to the inner wall of the stator (2) via a first bearing (4) and a second bearing (6) respectively.

3. The friction and drag reducing device for downhole tools according to claim 1, characterized in that: There are multiple turbines (5), and each of the multiple turbines (5) is arranged and connected between the rotor (3) and the stator (2).

4. The friction and drag reducing device for downhole tools according to claim 1, characterized in that: The valve assembly comprises a movable valve (7), a nozzle (8) and a static valve (9); one end of the movable valve (7) is fixedly connected to one end of the rotor (3); the end of the rotor (3) connected to the movable valve (7) is a hollow structure, and the inside of the movable valve (7) is in communication with the outside of the rotor (3); the static valve (9) is fixedly connected to the lower joint (11); outlets of the static valve (9) and the nozzle (8) are arranged at outlet positions that are offset from each other; the movable valve (7) and the static valve (9) are rotationally connected by interference fit; outlets of corresponding positions are arranged on the side of the movable valve (7) and the side of the static valve (9); the outlet position of the side of the static valve (9) is fixedly connected to one end of the nozzle (8); and the other end of the nozzle (8) is in communication with the outside of the lower joint (11).

5. The friction and drag reducing device for downhole tools according to claim 4, characterized in that: The outer wall of the lower joint (11) is provided with a protective tube (10), the protective tube (10) is located at a position where the nozzle (8) is installed, and a through hole is provided on the protective tube (10), and the position of the through hole on the protective tube (10) corresponds to the position of the nozzle (8).

Images