Multi-activation frequency conversion power short assembly

Abstract

The present application relates to the technical field of oil and gas drilling, and discloses a multiple-activation variable-frequency power short section assembly, which comprises a bypass turbine shaft, a turbine driving structure and the multiple-activation variable-frequency power short section assembly, a valve ball structure is arranged on the upper part of the bypass turbine shaft, and a static valve and a dynamic valve are arranged on the lower part of the bypass turbine shaft. The multiple-activation variable-frequency power short section assembly provided by the present application is provided with ball valve holes for shunting drilling fluid at the upper end of the turbine shaft, the flow direction of the well fluid is adjusted by changing the opening and closing state of different ball valve holes, the rotating speed of the turbine rotating driving structure is adjusted, the oscillation frequency of the turbine type hydraulic oscillator for drilling is adjusted, and the purpose of adjustable drilling parameters is achieved. Through the use of the valve ball, the turbine type hydraulic oscillator successfully realizes the transformation of two working modes within a certain number of times, and the service life and stability of the turbine type hydraulic oscillator for drilling are increased.

Description

Technical Field

[0001] This invention relates to the field of oil and gas drilling technology, specifically to a multi-activation variable frequency power sub assembly. Background Technology

[0002] In recent years, the oil industry has developed rapidly. To increase oil and gas production and improve extraction efficiency, drilling technologies such as directional wells, horizontal wells, and extended reach wells have been widely applied in oil fields. Due to the complexity of the wellbore trajectory, especially in sections with a large vertical ratio, the bottom drill string can easily "lie" on the well wall. The weight of the drill string generates significant friction, leading to drill string sticking and other issues during drilling. Especially during sliding drilling, the drill string remains relatively stationary with the wellbore rock for a certain period, generating even greater static friction. This reduces the pressure applied to the drill bit, resulting in a lower rate of penetration, longer drilling cycles, and increased drilling costs, severely limiting the development of drilling technology. Hydraulic oscillators are an effective tool for solving the problem of excessive friction between the drill string and the well wall.

[0003] The hydraulic oscillator uses the hydraulic energy of drilling fluid as its power source. By adjusting the nozzle structure inside the power sub assembly, it changes the flow area of ​​the drilling fluid, causing the drilling fluid to generate periodic pressure pulses. These pressure pulses act on the oscillating sub assembly, and the axial vibration of the oscillating sub assembly drives the drill string to vibrate periodically in the axial direction. This transforms the static friction state between the drill string and the wellbore rock into a dynamic friction state, reducing the frictional resistance between the drill string and the wellbore rock. This solves the problems of pressure buildup and sticking caused by excessive frictional resistance during drilling, and avoids excessive impact on the drill bit, thereby improving the mechanical drilling speed and reducing drilling costs.

[0004] Turbine-driven hydraulic oscillators, constructed entirely of metal, effectively overcome high-temperature challenges and are suitable for use in oil-based drilling mud. However, these existing turbine-driven hydraulic oscillators remain in a high-frequency operating state after completing their downhole tasks, unable to be shut off or have their operating frequency reduced. The oscillator's transmission components operate at high speed continuously, resulting in severe wear and impacting tool lifespan. If the hydraulic oscillator could be stopped or have its operating frequency reduced in non-working areas downhole via a switch, wear on the transmission components could be minimized, thereby increasing tool lifespan.

[0005] To address this, we propose a multi-activation variable frequency drive short-section assembly to overcome the shortcomings of existing technologies. Summary of the Invention

[0006] The purpose of this invention is to provide a multi-activation variable frequency power sub-assembly that solves the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a multi-activation variable frequency power sub assembly, comprising a bypass turbine shaft, a turbine drive structure, and a multi-activation variable frequency power sub assembly. A valve ball structure is provided on the upper part of the bypass turbine shaft, and a stationary valve and a dynamic valve are provided on the lower part of the bypass turbine shaft. The turbine drive structure is coaxially mounted on the bypass turbine shaft, and a screw housing is externally mounted on the turbine drive structure. An anti-drop connector is connected to the upper part of the screw housing, and a lower connector is connected to the lower part of the screw housing. A drainage hole is provided at one location on the multi-activation variable frequency power sub assembly.

[0008] Preferably, the bypass turbine shaft is provided with an axially penetrating axial flow channel and a radially penetrating ball valve orifice flow channel. The ball valve orifice flow channel connects the axial flow channel and the annulus between the bypass turbine shaft and the first sleeve. The upper part of the axial flow channel is connected to a perforated ball valve seat. The closing valve ball engages with the ball valve seat to close the axial flow channel, allowing all drilling fluid flow to flow into the turbine drive structure. The opening valve ball closes with the ball valve orifice flow channel, increasing the hydraulic pressure within the valve ball structure. The increased hydraulic pressure dislodges the closing valve ball, and all valve balls fall into the ball bag.

[0009] Preferably, the intermediate flow channel of the bypass turbine shaft is provided with a raised step, the raised step is connected to a ball bag, the ball bag can collect the valve ball falling into the intermediate flow channel and allow drilling fluid to pass through.

[0010] Preferably, the multi-activation variable frequency power sub assembly includes the bypass turbine shaft and the anti-drop joint; a first step portion with a decreasing diameter is provided on the bypass turbine shaft inside the anti-drop joint, and a first packer is provided on the first step portion, the first packer sealing the annulus between the bypass turbine shaft and the anti-drop joint.

[0011] Preferably, a ball valve seat is provided at one point of the ball valve orifice flow channel, the ball valve seat is connected to the first sleeve, the outer ring of the upper centralizing bearing is installed below the first sleeve, a multi-stage turbine rotor is installed below the outer ring of the upper centralizing bearing, a multi-stage turbine stator is installed at the bottom of the multi-stage turbine rotor, and both the multi-stage turbine rotor and the multi-stage turbine stator are disposed inside the screw housing.

[0012] Preferably, the bottom of the multi-stage turbine stator is equipped with the outer ring of the lower centralizing bearing, the outer ring of the lower centralizing bearing is connected to the inner ring of the lower centralizing bearing, the bottom of the outer ring of the lower centralizing bearing is connected to the second sleeve, the bottom of the second sleeve is provided with the second packer, the bottom of the second packer is equipped with the thrust bearing, and the bottom of the thrust bearing is...

[0013] Preferably, a second static valve locking seat is provided between the lower connector and the static valve, the static valve is connected to a first static valve locking seat, a static valve flow channel and a moving valve flow channel are respectively provided at one point of the static valve, and a valve connector is installed above the static valve.

[0014] Preferably, the outer wall of the ball bag is fixedly installed with the inner ring of the upper centering bearing, and the ball bag is equipped with a valve closing ball.

[0015] This invention provides a multi-activation variable frequency drive subassembly. This multi-activation variable frequency drive subassembly has the following advantages:

[0016] The multi-activation variable frequency power sub-assembly provided by this invention has a ball valve orifice at the upper end of the turbine shaft for diverting drilling fluid. By changing the opening and closing state of different ball valve orifices, the flow direction of the well fluid is adjusted, thereby adjusting the rotation speed of the turbine drive structure and thus adjusting the oscillation frequency of the drilling turbine hydraulic oscillator. This achieves the goal of adjustable drilling parameters. Through the use of the ball valve, the turbine hydraulic oscillator can be successfully switched between two working modes within a certain number of cycles, increasing the service life and stability of the drilling turbine hydraulic oscillator.

[0017] The multi-activation variable frequency power sub assembly provided by this invention has the characteristics of convenient operation, strong adaptability, simple structure and no impact on the drill string structure, which is of great significance for improving the tool life of hydraulic oscillators. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the multi-activation variable frequency power sub-assembly of the present invention;

[0019] Figure 2 This is a schematic diagram of the high-frequency mode of the multi-activation variable frequency power sub-section assembly of the present invention;

[0020] Figure 3 This is a schematic diagram of the high-frequency mode shutdown of the multi-activation variable frequency power sub-section assembly of the present invention.

[0021] Figure 4 This is a schematic diagram of the low-frequency mode of the multi-activation variable frequency power short section assembly of the present invention;

[0022] Figure 5 for Figure 1 Enlarged view of section I in the middle;

[0023] Figure 6 for Figure 2 Enlarged view of section I in the middle;

[0024] Figure 7 for Figure 3 Enlarged view of section I in the middle;

[0025] Figure 8 for Figure 4 Enlarged view of section I in the middle;

[0026] Figure 9 for Figure 1 Enlarged view at point II;

[0027] Figure 10 for Figure 1 Enlarged view of section III.

[0028] In the diagram: 100. Multi-activation variable frequency power short section assembly; 101. Axial flow channel; 1. Anti-drop joint; 2. First packer; 3. Ball valve orifice flow channel; 4. Ball valve seat; 5. First sleeve; 6. Raised step; 7. Outer ring of upper centralizing bearing; 8. Multi-stage turbine rotor; 9. Multi-stage turbine stator; 10. Screw housing; 11. Outer ring of lower centralizing bearing; 12. Inner ring of lower centralizing bearing; 13. Second sleeve; 1 4. Second packer; 15. Thrust bearing; 16. Third sleeve; 17. Valve disc rotor; 18. Lower connector; 19. Second stationary valve locking seat; 20. Stationary valve; 21. Dynamic valve; 22. First stationary valve locking seat; 23. Stationary valve flow passage; 24. Dynamic valve flow passage; 25. Valve connector; 26. Drain hole; 27. Bypass turbine shaft; 28. Ball bag; 29. ​​Inner ring of upper centralizing bearing; 30. Closing valve ball; 31. Opening valve ball. Detailed Implementation

[0029] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0030] A preferred embodiment of the multi-activation variable frequency drive sub-junction assembly provided by the present invention is as follows: Figures 1 to 10 As shown:

[0031] A multi-activation variable frequency power sub assembly includes a bypass turbine shaft 27, a turbine drive structure, and a multi-activation variable frequency power sub assembly 100. A valve ball structure is provided on the upper part of the bypass turbine shaft 27, and a static valve 20 and a dynamic valve 21 are provided on the lower part of the bypass turbine shaft 27. The turbine drive structure is coaxially sleeved on the bypass turbine shaft 27, and a screw housing 10 is sleeved on the outside of the turbine drive structure. An anti-drop connector 1 is connected to the upper part of the screw housing 10, and a lower connector 18 is connected to the lower part of the screw housing 10. A drainage hole 26 is provided at one point in the multi-activation variable frequency power sub assembly 100.

[0032] The bypass turbine shaft 27 is provided with an axially penetrating axial flow channel 101 and a radially penetrating ball valve orifice flow channel 3. The ball valve orifice flow channel 3 connects the axial flow channel 101 and the annulus between the bypass turbine shaft 27 and the first sleeve 5. The upper part of the axial flow channel 101 is connected to a perforated ball valve seat 4. The closing valve ball 30 is combined with the ball valve seat 4 to close the axial flow channel 101, so that all the drilling fluid flow flows into the turbine drive structure. The opening valve ball 31 is closed with the ball valve orifice flow channel 3, increasing the hydraulic pressure in the valve ball structure. The increased hydraulic pressure squeezes out the closing valve ball 30, and all the valve balls fall into the ball bag 28. The intermediate flow channel of the bypass turbine shaft 27 is provided with a raised step 6, which is connected to the ball bag 28. The ball bag 28 can collect the valve balls that fall into the intermediate flow channel and allow the drilling fluid to pass through. The outer wall of the ball bag 28 is fixedly installed with the inner ring 29 of the upper centering bearing, and the closing valve ball 30 is installed inside the ball bag 28.

[0033] The multi-activation variable frequency power sub assembly 100 includes a bypass turbine shaft 27 and an anti-drop joint 1; a first step portion with a decreasing diameter is provided on the bypass turbine shaft 27 inside the anti-drop joint 1, and a first packer 2 is provided on the first step portion, the first packer 2 sealing the annular space between the bypass turbine shaft 27 and the anti-drop joint 1.

[0034] A ball valve seat 4 is provided at one point in the ball valve orifice flow channel 3. The ball valve seat 4 is connected to the first sleeve 5. The outer ring 7 of the upper centralizing bearing is installed below the first sleeve 5. A multi-stage turbine rotor 8 is installed below the outer ring 7 of the upper centralizing bearing. A multi-stage turbine stator 9 is installed at the bottom of the multi-stage turbine rotor 8. Both the multi-stage turbine rotor 8 and the multi-stage turbine stator 9 are located inside the screw housing 10. The outer ring 11 of the lower centralizing bearing is installed at the bottom of the multi-stage turbine stator 9. The outer ring 11 of the lower centralizing bearing is connected to the inner ring 12 of the lower centralizing bearing. The bottom of the outer ring 11 is connected to the second sleeve 13, the bottom of the second sleeve 13 is provided with the second packer 14, the bottom of the second packer 14 is provided with the thrust bearing 15, the bottom of the thrust bearing 15 is provided with the third sleeve 16, the bottom of the third sleeve 16 is connected to the valve disc rotor 17, the lower connector 18 is provided with the second static valve locking seat 19 between the static valve 20 and the static valve 20, the static valve 20 is connected with the first static valve locking seat 22, the static valve 20 is provided with the static valve flow channel 23 and the moving valve flow channel 24 respectively, and the valve connector 25 is installed on the top of the static valve 20.

[0035] Working principle: The usage process of the multi-activation variable frequency power sub assembly 100 of the present invention is as follows:

[0036] The multi-activation variable frequency drive sub assembly 100 closes the axial flow channel 101 of the turbine shaft 27 by inserting a closing valve ball 30 inside the tool, allowing all the well fluid in the tool to flow into the turbine structure, increasing the turbine speed and operating frequency. When the multi-activation variable frequency drive sub assembly 100 needs to reduce the operating frequency, two opening valve balls 31 are inserted to block the channel from the turbine shaft 27 to the turbine drive structure. The pressure inside the axial flow channel 101 increases, squeezing the opening valve balls 31, which eventually fall into the intermediate flow channel along with the deformed opening valve balls 31. The channel is then fully opened, allowing drilling fluid to flow into both the axial flow channel 101 and the turbine drive structure simultaneously, reducing the turbine speed and operating frequency. Through the use of valve balls, the multi-activation variable frequency drive sub assembly 100 successfully switches between two operating modes within a certain number of cycles.

[0037] The above description is merely an illustrative embodiment of the present invention and is not intended to limit the scope of the invention. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principles of the present invention should fall within the scope of protection of the present invention. Furthermore, it should be noted that the components of the present invention are not limited to the overall application described above. Each technical feature described in the specification can be used individually or in combination as needed. Therefore, the present invention naturally covers other combinations and specific applications related to the inventive points of this case.

Claims

1. A multi-activation variable frequency drive sub-assembly, characterized in that: The assembly includes a bypass turbine shaft (27), a turbine drive structure, and a multi-activation variable frequency power sub assembly (100). The bypass turbine shaft (27) is provided with a valve ball structure on its upper part and a static valve (20) and a dynamic valve (21) on its lower part. The turbine drive structure is coaxially mounted on the bypass turbine shaft (27). A screw housing (10) is fitted outside the turbine drive structure. An anti-drop connector (1) is connected to the upper part of the screw housing (10), and a lower connector (18) is connected to the lower part of the screw housing (10). A drainage hole (26) is provided at one point in the multi-activation variable frequency power sub assembly (100). The bypass turbine shaft (27) is provided with an axially penetrating axial flow channel (101) and a radially penetrating ball valve orifice flow channel (3). A ball valve seat (4) is provided at one point of the ball valve orifice flow channel (3). The ball valve seat (4) is connected to the first sleeve (5). The ball valve orifice flow channel (3) connects the axial flow channel (101) and the annulus between the bypass turbine shaft (27) and the first sleeve (5). The upper part of the axial flow channel (101) is connected to the perforated ball valve seat (4). The closing valve ball (30) is combined with the ball valve seat (4) to close the axial flow channel (101) so that all the drilling fluid flow flows into the turbine drive structure. The opening valve ball (31) is closed with the ball valve orifice flow channel (3) to increase the hydraulic pressure in the valve ball structure. The increased hydraulic pressure squeezes out the closing valve ball (30), and the valve balls fall into the ball bag (28).

2. The multi-activation variable frequency power sub-assembly according to claim 1, characterized in that: The bypass turbine shaft (27) has a raised step (6) in the middle channel, which is connected to a ball bag (28) that can collect valve balls falling into the middle channel and allow drilling fluid to pass through.

3. The multi-activation variable frequency power sub-assembly according to claim 2, characterized in that: The multi-activation variable frequency power sub assembly (100) includes the bypass turbine shaft (27) and the anti-drop joint (1); the bypass turbine shaft (27) is provided with a first step portion with a decreasing diameter located inside the anti-drop joint (1), and a first packer (2) is provided on the first step portion, the first packer (2) sealing the annulus between the bypass turbine shaft (27) and the anti-drop joint (1).

4. The multi-activation variable frequency power sub-assembly according to claim 3, characterized in that: The outer ring (7) of the upper centralizing bearing is installed below the first sleeve (5). A multi-stage turbine rotor (8) is installed below the outer ring (7) of the upper centralizing bearing. A multi-stage turbine stator (9) is installed at the bottom of the multi-stage turbine rotor (8). Both the multi-stage turbine rotor (8) and the multi-stage turbine stator (9) are located inside the screw housing (10).

5. The multi-activation variable frequency power sub-assembly according to claim 4, characterized in that: The bottom of the multi-stage turbine stator (9) is equipped with the outer ring (11) of the lower centralizing bearing, the outer ring (11) of the lower centralizing bearing is connected to the inner ring (12) of the lower centralizing bearing, the bottom of the outer ring (11) of the lower centralizing bearing is connected to the second sleeve (13), the bottom of the second sleeve (13) is provided with the second packer (14), the bottom of the second packer (14) is equipped with the thrust bearing (15), the bottom of the thrust bearing (15) is provided with the third sleeve (16), the bottom of the third sleeve (16) is connected to the valve disc rotor (17).

6. The multi-activation variable frequency power sub-assembly according to claim 5, characterized in that: A second static valve locking seat (19) is provided between the lower connector (18) and the static valve (20). The static valve (20) is connected to a first static valve locking seat (22). The static valve (20) is provided with a static valve flow channel (23) and a moving valve flow channel (24) at one location. A valve connector (25) is installed above the static valve (20).

7. The multi-activation variable frequency power sub-assembly according to claim 6, characterized in that: The outer wall of the ball bag (28) is fixedly installed with the inner ring (29) of the upper centering bearing, and the ball bag (28) is equipped with a valve closing ball (30).

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