CN114961551A - All-metal axial double-plunger rotary impact type downhole positive displacement motor - Google Patents

Abstract

The application relates to an all-metal axial double-plunger rotary impact type downhole positive displacement motor which comprises an upper joint, an impact module, a double-plunger rotary part and an output shaft. The impact module is connected with the pressure spring through an impact valve block, and a hemisphere is oscillated by the flow distribution impact valve block to form impact force crushed rock; the flow distribution plate and the flow distribution shaft are combined to form a double flow distribution mechanism which is respectively connected with the impact module channel and the double-plunger rotating part channel and is in differential connection with the upper channel and the lower channel of the stator by 30 degrees; the double-plunger rotary component consists of an upper rotary component and a lower rotary component, any rotary component is connected with the rotor rotary wheel through a plunger stator, N balls are arranged on the rotary wheel, a thrust bearing is arranged between the upper rotor rotary wheel and the lower rotor rotary wheel, the drilling fluid of the double-distributing mechanism pushes the upper plunger stator to do axial linear motion, the bumps distributed on the surface of the rotary wheel push the rotor rotary wheel to move and rotate for a certain angle, and meanwhile, the lower plunger stator resets to a starting point through the rotary axial direction of the rotor wheel and discharges drilling fluid, so that the reciprocating stator plunger moves to push the rotor rotary wheel to rotate circularly and output torque. The high-temperature-resistant rotary impact mechanism has the characteristics of high temperature resistance, rotary impact and large torque.

Description

All-metal axial double-piston rotary impact type downhole volumetric motor

technical field

The present application relates to downhole motors, and more particularly, to an all-metal axial double-piston rotary impact type downhole positive displacement motor.

Background technique

At present, bottom-hole power motor-driven drilling is an inevitable choice for drilling in deep, ultra-deep and high-temperature formations. Downhole power motors mainly include screw motors and turbine motors. Conventional screw motors cannot be used under high temperature conditions of ≥180 °C. The current machining level of the stator of the all-metal screw motor cannot guarantee the machining accuracy; the turbine motor is a non-displacement motor, and has the characteristics of high speed and low torque, which is not suitable for deep drilling; and the plunger structure has good sealing performance and large torque, and is suitable for hard formations. The rotary impact method is more conducive to crushing rock. Therefore, a motor with an all-metal plunger structure and rotary impact operating characteristics is more conducive to drilling in deep, ultra-deep, high-temperature formations and hard rock formations.

In view of the phenomenon of drilling in the above, the rotary impact type volume motor is an inevitable choice for deep earth, ultra-deep and high temperature deep and hard rock drilling.

SUMMARY OF THE INVENTION

In order to carry out effective drilling in deep, ultra-deep wells and high temperature geothermal and hard rock formations, the present invention provides an all-metal axial double-piston rotary impact type downhole volume motor.

This application provides an all-metal axial double-piston rotary impact type downhole volume motor, which specifically adopts the following technical solutions:

All-metal axial double-plunger rotary impact type downhole volume motor, including the upper joint, impact module and double-plunger rotary parts and other components.

The impact module is connected by the impact valve block and the pressure spring, and the hemispherical oscillation is impacted by the impact valve block;

The distribution plate and the distribution shaft are combined to form a double distribution mechanism, which is respectively connected with the impact module and the double plunger stator channel. Through the connection with the impact module channel and the cooperation of the pressure spring, the high pressure chamber and the low pressure chamber are intermittently opened and closed. The oscillating hemisphere; and The difference between the upper and lower passages of the stator is 30°, so that the high and low pressure in the double plunger cavity are alternately converted.

The double-plunger rotary part is composed of upper and lower rotary parts, and any rotary part will be composed of the plunger stator and the rotor rotary wheel. The inner rotor of the rotary part is a rotary wheel, and N balls are placed on the rotary upper part, and a thrust bearing is placed in the middle of the upper and lower rotor rotary wheels.

The distribution plate and the distribution shaft are combined to form a double distribution mechanism, which is respectively connected with the impact module and the double plunger rotary component channel. Through the connection with the impact module channel and the cooperation of the pressure spring, the high pressure chamber and the low pressure chamber are intermittently opened and closed. The oscillating hemisphere; The difference between the upper and lower channels of the stator is 30°, so that the high and low pressure in the double plunger cavity are alternately converted.

The rotation of the upper plunger stator bump pushes the rotor wheel to give way, and then the lower plunger stator distributes the flow through the distribution shaft.

By adopting the above technical solution, the pressure impact valve block impacts the elastic hemisphere, which effectively increases the drilling effect of the motor, and at the same time improves the stress of the bottom hole motor stuck.

Preferably, the plunger stator is used as the hydraulic force to convert into mechanical rotational force, and the leakage of the plunger is almost negligible, which improves the conversion efficiency of motor kinetic energy.

Through the above technical solution, the linear motion conversion of the plunger stator drives the rotary motion of the rotor with the balls.

The upper ball is preferably rotated to reduce the friction force of the mating surface, and the conversion efficiency is higher.

Thrust bearing is used between the up and down rotation of the rotor, which effectively reduces the axial impact force of the plunger and makes the circumferential movement of the motor rotor more flexible.

To sum up, the present application includes at least one of the following beneficial technical effects:

1. The impact module is connected by the impact valve block and the pressure spring, and the hemisphere is oscillated by the impact valve block through the flow distribution to form the impact force to break the rock and realize the effect of the motor impacting the broken rock and drilling;

2. The distribution plate and the distribution shaft are combined into a double distribution mechanism, which are respectively connected with the impact module and the double plunger stator channel. Through the connection with the impact module channel and the cooperation of the pressure spring, the high pressure chamber and the low pressure chamber are intermittently opened and closed. ; The difference between the upper and lower passages of the stator is 30°, so that the high and low pressure in the double plunger cavity are alternately converted.

3. The axial linear motion of the plunger and stator is converted into the rotary motion of the rotor. The piston is a volumetric type with good sealing, which reduces the kinetic energy loss of the motor due to leakage and improves the output efficiency of the motor;

Description of drawings

1 is a schematic diagram of the overall structure of an all-metal axial double-piston rotary impact type downhole positive displacement motor in an embodiment of the present application;

Figure 2 is a schematic view of the overall structure of the shell cutaway in the all-metal axial double-piston rotary impact type downhole volume motor;

Figure 3 is a schematic diagram of the internal structure of the shell and stator in the all-metal axial double-piston rotary impact type downhole volume motor;

Figure 4 is a schematic diagram showing the structure of the upper end of the impact;

Figure 5 is an oblique view showing the impact structure;

Figure 6 is a schematic diagram showing the impact bottom structure;

Figure 7 is a schematic diagram showing the water inlet end cover of the motor;

Figure 8 is a schematic diagram of the structure of the motor distribution shaft;

FIG. 9 is a schematic diagram showing the rotary structure and assembly of the motor;

Figure 10 is a schematic diagram showing the structure of the plunger stator;

Figure 11 is a schematic diagram of the structure of the stator fixed housing;

Figure 12 is a schematic diagram of the structure of the motor distribution plate;

Figure 13 is a schematic view of the rotor structure of the motor with thrust bearing;

Figure 14 is a schematic diagram of the structure of the water outlet component at the bottom of the motor;

Figure 15 is a schematic diagram of the outer casing structure of the motor belt distribution;

Figure 16 is a schematic diagram of the motor spline shaft structure

Description of reference numbers:

1. Upper joint; 2. Impact module; 201, impact valve block; 202, pressure spring; 203, semicircular through hole; 204, water inlet; 205, high pressure channel; 206, bearing; 207, impact inclined hole; 208, Steel ball; 209, hemisphere; 210, tension spring; 211, bolt hole; 212, impact lower base; 213, upper end cover; 214, distribution shaft; 215, upper distribution hole; 216, lower distribution hole; 217, impact water hole ; 3. Double plunger rotary parts; 301, on the stator limit block; 302, on the rotor rotary wheel; 303, distribution water inlet; 304, thrust bearing; 305, distribution plate; 306, water outlet plate; 307, Lower seal; 308, ball; 309, rotor water inlet; 310, rotor water outlet; 311, Bafang shaft; 312, stator outer cylinder; 313, rotor rotary wheel; 314, plunger stator; 315, plunger stator lower; 316, plunger sealing ring; 317, stator bump; 318, stator water hole; 319, lower stator limit block; 320, valve plate nozzle; 321, water outlet hole; 322, water hole in outer cylinder; 4, Splined shaft.

Detailed ways

The present application will be further described in detail below in conjunction with accompanying drawings 1-8.

The implementation of the present application discloses an all-metal axial double-piston rotary impact type downhole positive displacement motor. 2 and 3, the all-metal axial double plunger rotary impact type downhole volume motor includes an upper joint 1, an impact module 2, an impact base 212, an impact hemisphere 209, a plunger stator 314 and a rotor rotary wheel 302. Among them, the water inlet 204 is defined to connect the shock valve block 201 to the shock pressure spring 202 and the semicircular through hole 203; the water distribution inlet 303 is connected to the distribution shaft 214 for distribution, the stator bump 317, the plunger stator 314, the rotor The upper rotary wheel 302 is matched to form an upper rotary part; the lower rotor rotary wheel 313, the lower plunger stator 315, the distribution plate 305, the water outlet plate 306 and the lower seal 307 are connected and matched to form a lower rotary part.

3 and 4 , the shock valve block 201 is connected to the pressure spring 202. When the hydraulic pressure pushes the shock valve block 201 down to the shock hemisphere 209, the channel cavity of the water inlet hole 204 is connected to the shock water hole 217. When the force decreases, the pressure spring 202 bounces up the impact valve block 201, the channel of the impact water hole 217 is closed, the pressure of the water inlet hole 204 increases again, and the impact hemisphere 209 is pressed down by the impact valve block 201, and the impact hemisphere 209 passes around the The tension spring 210 is connected, and after being impacted, due to the inertia and elasticity of the tension spring 210, the impact hemisphere 209 oscillates up and down, so that the motor impacts and breaks the rock.

5 and 6 , the impact valve block 201 is connected with the steel ball 208 and is displaced axially by hydraulic pressure.

7 and 8, the upper end cover 213 is connected with the distribution shaft 214, and the distribution shaft 214 is assembled with the distribution plate 305, so that when the plunger cavity 314 on the plunger stator is filled with high-pressure drilling fluid, the water outlet plate 306 and the plunger stator The cavity formed by the lower 315 is connected to the low pressure channel. When the 314 on the plunger stator moves axially, it pushes the plunger to rotate and the rotor rotates to give way to the rotation, the lower 315 of the plunger stator moves to the highest point of rotation, and then the distribution plate 305 distributes the flow, enters the high-pressure drilling fluid, and pushes the 315 shaft under the plunger stator. The reciprocating motion of the plunger pushes the rotor to give way to continuous rotation.

9 and 10 , N stator bumps 317 are processed on the end of the plunger stator 314 , and the stator limit blocks 319 are embedded between the plunger stator 314 to limit the circumferential position of the plunger stator 314 .

11 , 12 and 13 , it is defined that the upper distribution hole 215 cooperates with the rotor water inlet 309 to form a channel opened through a certain angle, and the channel closed after a certain angle, and then the drilling fluid is discharged through the distribution plate nozzle 320 .

13, 14, 15 and 16, it is defined that the rotor water outlet 310 is connected with the water outlet hole 321, and the water outlet hole 321 is connected with the outer cylinder water hole 322, and the octagonal shaft 311 is connected with the spline shaft 4 to output torque.

The above are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore: all equivalent changes made according to the structure, shape and principle of the present application should be covered within the scope of the present application. Inside.

Claims (8)

1. An all-metal axial double-plunger rotary impact downhole volume motor, characterized in that it comprises an upper joint (1), an impact module (2), a double-plunger rotary component (3) and an output shaft (4). The impact module (2) is connected with the pressure spring (202) by the impact valve block (201), and oscillates the hemisphere (209) through the impact valve block (201) to form impact crushed rock; the valve plate (305) and the valve shaft (214) ) are combined into a double distribution mechanism, which are respectively connected with the impact module (2) and the double plunger rotating part (3); the double plunger rotating part (3) is composed of two upper and lower rotating parts. The stator (314) is connected with the rotor turning wheel (302), the rotor turning wheel (302) is processed with N upper and lower turning wheels, and the upper rotor turning wheel (302) and the lower rotor turning wheel (313) are placed in the middle The push bearing (304) makes the high-pressure drilling fluid push the upper plunger stator (314) to move axially and linearly through the flow distribution mechanism, and the stator bumps (317) distributed on the surface push the rotor rotary wheel (302) to give way to rotate at a certain angle, At the same time, the lower plunger stator (315) is axially reset to the starting point by the rotation of the rotor wheel (302) and the drilling fluid is discharged, so that the reciprocating plunger stator (315) moves to push the rotor wheel (302) to rotate again and again, and the output torque. 2. The all-metal axial double-piston rotary impact downhole volumetric motor according to claim 1, characterized in that: when the hydraulic pressure presses the impact valve block (201) down the impact hemisphere (209), the water inlet (201) 204) The channel cavity is connected to the impact water hole (217), when the hydraulic pressure decreases, the pressure spring (202) bounces the impact valve block (201), the impact water hole (217) channel is closed, and the water inlet hole (204) ) The pressure of the chamber increases again, and the impact hemisphere (209) is pressed down by the impact valve block (201), and the impact hemisphere (209) is connected by a tension spring (210) around it. , so that the impact hemisphere (209) oscillates up and down, forming the impact force of the motor to break the rock. 3. The all-metal axial double-piston rotary impact downhole volume motor according to claim 1, characterized in that: the distribution plate (305) and the distribution shaft (214) are combined into a dual distribution mechanism, which is respectively connected with the impact module (305) and the distribution shaft (214). 2) It is connected with the channel of the double plunger rotary part (3), and through the channel connection with the impact module (2), the compression spring (202) cooperates to open and close the oscillating hemisphere (209) intermittently between the high pressure chamber and the low pressure chamber; and the stator The difference between the upper and lower channels is 30°, so that the high and low pressure in the double plunger cavity are alternately converted. 4. The all-metal axial double-piston rotary impact type downhole volume motor according to claim 3, characterized in that: the double flow distribution mechanism is connected to the impact module (2), and the impact valve block (201) is connected to the steel ball (208) connected, the hydraulic pressure produces axial displacement, the impact inclined hole (207) is connected with the low pressure channel to form a pressure relief channel, and the high pressure channel (205) is connected with the water inlet hole (204) to complete the flow distribution process of the impact module (2). 5. The all-metal axial double-piston rotary impact type downhole volume motor according to claim 1, characterized in that: the upper end cover (213) is connected to the distribution shaft (214), and the distribution shaft (214) is connected to the distribution plate (214). 305) Assemble and cooperate so that when the plunger cavity on the plunger stator (314) is filled with high-pressure drilling fluid, the cavity formed by the water outlet tray (306) and the plunger stator (315) is connected to the low-pressure channel. When the upper plunger stator (314) moves axially, it pushes the plunger to rotate and the rotor to give way to the rotation, and the lower plunger stator (315) moves to the highest point of rotation, and then the flow distribution plate (305) distributes the flow, enters the high-pressure drilling fluid, and pushes the The plunger moves axially under the stator (315), and the reciprocating motion of the plunger pushes the rotor to give way and rotate continuously. 6. The all-metal axial double plunger rotary impact type downhole volume motor according to claim 1, characterized in that: the end of the plunger stator (314) is machined with N stator bumps (317), and the stator limit block The lower part (319) is embedded between the upper part (314) of the plunger stator to limit the circumferential position of the plunger stator (314). 7. The all-metal axial double-piston rotary impact type downhole volumetric motor according to claim 1, characterized in that: the upper distribution hole (215) is defined to cooperate with the rotor water inlet (309) to form a channel opening through a certain angle. , turn a certain angle to close the channel, and then discharge the drilling fluid through the nozzle (320) of the flow distribution plate. 8. The high temperature-resistant all-metal ball-type plunger downhole drilling tool according to claim 1, wherein the rotor water outlet (310) is defined to be connected with the water outlet (321), and the water outlet (321) is connected to the outer cylinder The water hole (322) is connected, and the octagonal shaft (311) is connected with the spline output shaft (4) to output torque.

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