Multi-point torque excitation type underground generating device

Abstract

The utility model discloses a multi-point torque excitation type underground generating device which comprises an outer pipe, a sliding sleeve connected to the right end of the outer pipe through pipe threads, a shaft barrel connected to the outer side of the sliding sleeve in a clearance fit mode through a hole and a shaft, the diameter of the shaft barrel is the same as that of the sliding sleeve, and the multi-point torque excitation type underground generating device further comprises an outer pipe, an occupied seat is installed in an open groove in the outer pipe and connected with the shaft barrel through threads. A power valve is placed in a groove formed in the occupied seat, meanwhile, the outer end of the power valve is connected with a power hammer, and the power valve and the power hammer are placed in the occupied seat in a hole-shaft clearance fit mode. According to the multi-point torque excitation type underground generating device, the torque load generated by the tool structure is transmitted to the power assembly, so that foreign matters in drilling fluid can be effectively dispersed or vibrated off, and the stability of the tool is improved. And when the torque load is transmitted to the PDC drill bit, the instantaneous bit pressure of the PDC drill bit is increased, so that the PDC drill bit can drill more effectively, the drilling speed is increased, and the stick-slip phenomenon of the PDC drill bit is effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of oil drilling, in particular to a multi-point torque excitation downhole generating device. Background Technique

[0002] A downhole generating device refers to equipment installed in oil and gas wells or other downhole environments. Through its specific working principle and structural design, it generates certain effects or performs certain functions downhole. These effects or functions may include, but are not limited to, generating vibration, impact, pressure fluctuation, heat, chemical reaction, etc., for the purpose of serving oil and gas exploration, exploitation, production increase or other downhole operations;

[0003] At present, the widely used circumferential load impact device in the market. During the working process of the tool, when the drilling fluid passes through the throttle nozzle, the pressure of the drilling fluid in the central pipe increases, and a pressure difference is generated before and after the throttle nozzle. The upper end of the throttle nozzle is a high-pressure flow channel, and the lower end is a low-pressure flow channel; under the adjustment of the commutator, the pressure chambers at both ends of the pendulum are periodically and alternately connected to the high-pressure flow channel and the low-pressure flow channel. The pressure difference in the high- and low-pressure chambers drives the pendulum to reciprocate circumferentially, and the pendulum collides with the impact cylinder to generate periodic high-frequency and low-amplitude torsional impact loads. Thus, the energy of the drilling fluid is converted into circumferential reciprocating impact loads. However, with the gradual depletion of shallow oil and gas resources, the drilling engineering is gradually developing towards fields with severe environmental conditions such as deep wells. The hardness and plasticity of deep formation rocks increase, and the difficulty of rock breaking also increases significantly. Stick-slip phenomena are likely to occur, resulting in problems such as drill bit damage, low drilling speed, and high drilling costs. The effect of the existing circumferential load impact device in alleviating the stick-slip phenomenon of the lower drill string is weakened, and there are defects such as unstable performance and short service life, resulting in unsatisfactory rock breaking effect;

[0004] Therefore, we propose a multi-point torque excitation downhole generating device that can well solve the above problems. Content of the Utility Model

[0005] The purpose of the utility model is to provide a multi-point torque excitation downhole generating device to solve the problems in the above background technique that the effect of the existing circumferential load impact device in the current market in alleviating the stick-slip phenomenon of the lower drill string is weakened, and there are defects such as unstable performance and short service life, resulting in unsatisfactory rock breaking effect.

[0006] To achieve the above purpose, the utility model provides the following technical solution: A multi-point torque excitation downhole generating device includes an outer pipe, the right end of which is connected with a sliding sleeve through pipe threads, and the outer side of the sliding sleeve is connected with a shaft cylinder through clearance fit of a hole and a shaft, and the shaft cylinder has the same diameter as the sliding sleeve;

[0007] It further includes: an outer tube, inside which a seat is installed with grooves, and the seat is connected to the shaft cylinder by threads. A power valve is placed in the groove inside the seat. At the same time, a power hammer is connected to the outer end of the power valve. Moreover, the power valve and the power hammer are placed inside the seat through clearance fit of a hole and a shaft. The outer tube has a throttling orifice set in a groove on its right inner side, and the bottom of the throttling orifice corresponds to the seat. The right side of the seat is adhesively connected to the inner wall of the outer tube through a washer.

[0008] Preferably, a stroke cavity is set in a groove on the left inner side of the outer tube, and the seat is connected to the stroke cavity by screws.

[0009] Preferably, a cover plate is fixedly connected to the outer end of the stroke cavity by screws, and the cover plate is installed inside the left side of the outer tube.

[0010] Preferably, the stroke reversing sleeve is positioned by the bottom keyway and placed inside the stroke cavity through transitional fit of a hole and a shaft.

[0011] Preferably, upper and lower notches are respectively set in grooves at the upper and lower ends of the stroke reversing sleeve, and the upper and lower notches are of the same size. A positioning opening is provided at the bottom of the stroke reversing sleeve.

[0012] Preferably, an empty groove is set in a groove above the power valve, and the bottom of the empty groove corresponds to the upper notch. At the same time, the empty groove communicates with the upper notch.

[0013] Preferably, the punch piston and the stroke cavity are placed inside the stroke reversing sleeve through clearance fit, and are welded after clearance fit of a hole and a shaft with the cover plate.

[0014] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0015] The torque load generated by the tool structure is transmitted to the power assembly, which can effectively disperse or remove foreign substances in the drilling fluid and improve the stability of the tool. And when the torque load is transmitted to the PDC bit, the instantaneous drilling pressure of the PDC bit is increased, enabling the PDC bit to drill more effectively, improving the drilling speed, and effectively reducing the stick-slip phenomenon of the PDC bit. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is the main sectional structure schematic diagram of the present utility model;

[0017] Figure 2 is the three-dimensional structure schematic diagram of the stroke reversing sleeve of the present utility model;

[0018] Figure 3 is the bottom view structure schematic diagram of the stroke reversing sleeve of the present utility model;

[0019] Figure 4 is the top view structure schematic diagram of the stroke reversing sleeve of the present utility model.

[0020] In the figure: 1. Outer tube; 2. Power valve; 3. Power hammer; 4. Occupying seat; 5. Throttle orifice; 6. Gasket; 7. Sliding sleeve; 8. Shaft cylinder; 9. Filter cylinder; 10. Cover plate; 11. Stroke cavity; 12. Stroke reversing sleeve; 13. Punch piston; 14. Positioning opening; 15. Upper notch; 16. Lower notch; 17. Empty notch. Specific embodiments

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0022] The present utility model provides the following technical solutions:

[0023] In an embodiment, to solve the problems of poor drillability, low mechanical rotation speed, long drilling cycle, etc. that occur during deep hard formation drilling, and also to solve the problem that the existing circumferential load shocker has an unsatisfactory effect. It can not only perform circumferential load shock, but also perform axial load shock, and discloses:

[0024] The outer tube 1, its right end is connected with a sliding sleeve 7 through a pipe thread, and the outer side of the sliding sleeve 7 is connected with a shaft cylinder 8 through a clearance fit of hole and shaft, and the shaft cylinder 8 has the same diameter as the sliding sleeve 7;

[0025] It further includes: the outer tube 1, inside which an occupying seat 4 is installed in a groove, and the occupying seat 4 is connected with the shaft cylinder 8 through a thread. Inside the occupying seat 4, a power valve 2 is placed in a groove. At the same time, the outer end of the power valve 2 is connected with a power hammer 3. Moreover, the power valve 2 and the power hammer 3 are placed inside the occupying seat 4 through a clearance fit of hole and shaft. The outer tube 1, on the right side inside, has a throttle orifice 5 arranged in a groove, and the bottom of the throttle orifice 5 corresponds to the occupying seat 4. And the right side of the occupying seat 4 is adhesively connected to the inner wall of the outer tube 1 through a gasket 6.

[0026] On the left side inside the outer tube 1, a stroke cavity 11 is arranged in a groove, and the stroke cavity 11 is connected with the occupying seat 4 through a screw. The outer end of the stroke cavity 11 is fixedly connected with a cover plate 10 through a screw, and the cover plate 10 is installed inside the left side of the outer tube 1.

[0027] The stroke reversing sleeve 12 is positioned in direction through the bottom key position and placed inside the stroke cavity 11 through a transition fit of hole and shaft. The upper and lower ends of the stroke reversing sleeve 12 are respectively provided with an upper notch 15 and a lower notch 16, and the upper notch 15 and the lower notch 16 are of the same size. And a positioning opening 14 is arranged at the bottom of the stroke reversing sleeve 12.

[0028] An empty slot 17 is provided with a groove above the power valve 2, and an upper notch 15 corresponds to the bottom of the empty slot 17. At the same time, the empty slot 17 is communicated with the upper notch 15. The punch piston 13 and the stroke cavity 11 are placed in the stroke reversing sleeve 12 by clearance fit. The filter cartridge 9 and the cover plate 10 are welded and connected after clearance fit of the hole and shaft.

[0029] As Figure 1 shown, when the drilling fluid is conveyed through the tool, under the action of the stroke reversing sleeve 12, the punch piston 13 impacts up and down in the stroke cavity 11, and the impact load generated is transmitted to the power assembly, improving the stability of the downhole speed-up tool. The instantaneous drilling pressure of the PDC bit is increased, enabling the PDC bit to drill more effectively and improving the drilling speed.

[0030] As Figures 2 - 4 shown, the upper notch 15 and the lower notch 16 with a certain angle interval are arranged at the upper and lower ends of the stroke reversing sleeve 12. When the power valve 2 swings circumferentially, it will be communicated with the upper notch 15 and the lower notch 16 respectively, enabling the punch piston 13 to make an axial up-and-down impact movement along the stroke reversing sleeve 12 in the stroke cavity 11. A pressure relief groove is provided on the stroke cavity 11. When the punch piston 13 impacts up and down, the drilling fluid flows into the power assembly from the pressure relief groove, increasing the pressure difference between the high-pressure and low-pressure cavities in the power assembly, making the circumferential torsional impact of the power valve 2 smoother and faster. And during the downhole drilling process, the impact load generated by the up-and-down impact movement of the punch piston 13 is transmitted to the power assembly, which can effectively disperse or shake off the impurities and foreign objects in the drilling fluid, greatly reducing the probability of blockage caused by excessive impurities and foreign objects in the drilling fluid in the power assembly, improving the overall stability of the tool. And when the torque load is transmitted to the PDC bit, the instantaneous drilling pressure of the PDC bit is increased, improving the drilling ability of the PDC bit, and thus improving the drilling speed;

[0031] The upper notch 15 and the lower notch 16 with a certain angle interval are arranged above and below the stroke reversing sleeve 12. When the power valve 2 rotates counterclockwise, the empty slot 17 on the power valve 2 is communicated with the lower notch 16 at the lower part of the stroke reversing sleeve 12, and the drilling fluid pressure will cause the punch piston 13 to generate an upward impact load. When the power valve 2 rotates clockwise, the empty slot 17 on the power valve 2 is communicated with the upper notch 15 at the upper part of the stroke reversing sleeve 12, and the drilling fluid pressure will cause the punch piston 13 to generate a downward impact load. Every time the power valve 2 rotates once, the punch piston 13 impacts axially once.

[0032] The content not described in detail in this specification belongs to the prior art well-known to those skilled in the art. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A multi-point torque excitation downhole generating device, comprising an outer tube (1), the right end of which is connected to a sliding sleeve (7) through a pipe thread, and the outer side of the sliding sleeve (7) is connected to a shaft cylinder (8) through a hole-shaft clearance fit, and the shaft cylinder (8) and the sliding sleeve (7) have the same diameter; It is characterized in that Also includes: The outer tube (1) has a slotted inner portion and a seat (4) installed therein, and the seat (4) is connected to the shaft cylinder (8) through a thread, and a power valve (2) is placed in the inner slotted inner portion of the seat (4), and a power hammer (3) is connected to the outer end of the power valve (2), and the power valve (2) and the power hammer (3) are placed inside the seat (4) through a hole-shaft clearance fit; The outer tube (1) has a throttling water hole (5) formed in a groove on its right side, and a seat (4) is provided at the bottom of the throttling water hole (5), and the right side of the seat (4) is connected to the inner wall of the outer tube (1) through a gasket (6).

2. The multi-point torque excitation downhole generating device according to claim 1, characterized in that: The left inner groove of the outer tube (1) is provided with a stroke chamber (11), and the stroke chamber (11) is connected to a seat (4) via screws.

3. The multi-point torque excitation downhole generating device according to claim 2, characterized in that: The outer end of the stroke chamber (11) is fixedly connected to a cover plate (10) by means of screws, and the cover plate (10) is installed inside the left side of the outer tube (1).

4. The multi-point torque excitation downhole generating device according to claim 3 is characterized in that: The stroke reversing sleeve (12) is positioned in direction by a bottom key and is placed inside the stroke cavity (11) through a hole-shaft transition fit.

5. The multi-point torque excitation downhole generating device according to claim 4, characterized in that: The stroke reversing sleeve (12) is respectively slotted with an upper slot (15) and a lower slot (16) at the upper and lower ends thereof, and the upper slot (15) and the lower slot (16) are of the same size, and a positioning opening (14) is provided at the bottom of the stroke reversing sleeve (12).

6. The multi-point torque excitation downhole generating device according to claim 5, characterized in that: The upper groove of the power valve (2) is provided with an empty groove (17), and the bottom of the empty groove (17) corresponds to the upper groove opening (15), and the empty groove (17) is communicated with the upper groove opening (15).

7. The multi-point torque excitation downhole generating device according to claim 1, characterized in that: The punch piston (13) and the stroke chamber (11) are placed in the stroke reversing sleeve (12) through clearance fit, and the filter cartridge (9) and the cover plate (10) are welded and connected after the hole-shaft clearance fit.

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