Planetary electro-hydraulic drive orientator for well deviation control

Abstract

The invention mainly relates to a planetary electro-hydraulic drive orientator for well deviation control. The orientator comprises a valve, a turbine device, an alternating-current generator, a variable-speed motor, a planetary speed reducing mechanism, an electric connection box, a long shell, a gear box, a stepped driving shaft, a driving bush, a bolt and a sealing ring. The orienting tool is characterized in that channel liquid flows into a turbine generator, power is transmitted to a gearbox driver of an electric motor, trapezoidal threads with a first pitch begin to transmit rotational motion, the bushing is driven to generate axial translation, and the spindle is rotated back into rotational motion through a lead screw part of a planetary roller with a larger pitch. Due to the pitch difference between the pitch of the first lead screw and the pitch of the planetary roller lead screw, the transmitted rotary motion is output and converted into torque which is lower in speed and higher in bearing capacity through the planetary lead screw part. Therefore, the directional tool enables the drilling direction of the well bottom drilling tool assembly to have the advantages of being higher in direction precision and larger in torque.

Description

Technical Field

[0001] The invention relates to a planetary electro-hydraulic driven orienter for well deviation control, belonging to the technical field of oil and natural gas exploitation drilling tools. Technical Background

[0002] Whether drilling vertical wells or inclined wells, many drilling operations require directional control to avoid the bottom of the well being away from the designed well position and miss the oil and gas layer, thus destroying the original well layout plan. When drilling vertical wells, the main task of well deviation control is to prevent and correct the deviation, and a drill bit assembly with a stabilizer is often used. Once it comes to drilling with a fixed trajectory, a combination of drill bits such as a whipstock, a screw drill with a bent joint and a bent housing, a turbine drill with a bent joint or an eccentric stabilizer, and a jet drill bit can control the direction of wellbore drilling to varying degrees. In terms of trajectory controllability, the fastest progress is the use of positive displacement hydraulic motors and turbines with bent pipes, bent joints, or stabilizers.

[0003] Coiled tubing is a seamless, steel pipe that can be thousands of feet long. They are designed to collect and transport liquids or gases in oil and gas wells and are often used in the development and maintenance of oil fields. Coiled tubing and downhole mud pumps are used to turn the drill bit to deepen the wellbore, which is a more efficient way of drilling. The connection time required for complex rotary drilling is often reduced. In coiled tubing drilling, a downhole directional drilling tool assembly with a mud pump is connected to the end of the coiled tubing string. Usually, the motor has a fixed or adjustable bend joint or housing to change the drilling direction. However, since the coiled tubing cannot be rotated from the ground, the BHA is connected to a directional tool to adjust the bend of the motor to point to the desired drilling direction. The drive systems of these directional tools have their own advantages. Based on this, this paper proposes an electro-hydraulic drive guide for coiled tubing drilling with a planetary screw drive, which makes the drilling direction of the bottom hole drilling tool assembly have the advantages of higher directional accuracy, high torque and low speed. Summary of the invention

[0004] The object of the present invention is to overcome many technical problems associated with the transmission of a directional bottom hole assembly in a coiled tubing application.

[0005] To achieve the above purpose, the technical solution adopted by the present invention to solve this problem is: a planetary electro-hydraulic driven directional device for well inclination control is proposed for a coiled tubing directional tool. The directional device is composed of a channel fluid, a fluid guide valve, a turbine, an AC generator, a positioning sensor, an electrical connection box, a slip ring connector, a variable speed motor, a central tube, a gear box, a driver, a first screw, an input transmission shaft, a drive bushing, a long housing, a nut bushing, an axial moving part, a set screw, a main screw, a roller, a spline, a planet carrier, an output transmission shaft, an O-ring, an elastic retaining ring, a fluid output channel, and a connecting housing.

[0006] Its technical features are mainly as follows: the fluid defines the input channel through a rotating guide valve and drives the turbine, the turbine main shaft is connected to the AC generator, the positions of the generator and the center tube are monitored by sensors respectively, the cable is connected from the generator to the variable speed motor through an electrical connection box, there is also a guide ring support between the center tube and the variable speed motor, the gearbox is controlled by the variable speed motor, the drive is connected to the gearbox and has a boss positioning on one side, the variable speed motor, the gearbox and the drive are all in close contact with the inner wall of the long outer shell, the first lead screw and the outer shell leave a rotatable gap internal space, and rotate at a uniform speed or variable speed under the action of the drive, there is a bearing support, the inner side is meshed with the drive bushing part, there is no contact between the drive bushing and the input shaft, and it can move freely in the axial direction under the rotation of the first lead screw, the drive bushing is connected to the planetary screw nut bushing at the bottom, and there is a set screw Strengthen the connection between the two parts. The spline is located on the screw nut bushing to constrain the rotation. The inner side of the roller is meshed with the main screw and performs planetary motion along the raceway. The outer sides of both ends of the roller are meshed with the inner gear ring of the nut. Both ends of the roller are supported by planetary carriers. The roller, the main screw and the nut are all in point contact, which can ensure the coordinated work of the roller and the nut and synchronous axial movement along the screw. There is a threaded connection between the main screw and the input shaft, which is output to the output transmission shaft at a low speed and high load. The fluid finally flows through the channel outlet. There is a threaded connection between the output shaft housing and the main screw, and two O-rings are installed. The elastic retaining ring is used to position the inner ring of the bearing. The main screw is output to the output transmission shaft at a low speed and high load. The fluid finally flows through the channel outlet. The output shaft housing is used to connect subsequent guide devices such as elbows and elbows, so that the drilling direction can be adjusted accurately to 1°.

[0007] A planetary electro-hydraulic driven orienter for well inclination control, characterized in that the pitch of the main screw thread of the planetary roller screw is relatively larger than the pitch of the first screw thread by 10 to 1000 times.

[0008] A planetary electro-hydraulic driven orienter for well deviation control, characterized in that the difference in rotation angle or speed between the lead screw drive and the output shaft depends on the pitch difference and inherent transmission ratio of the reducer device.

[0009] A planetary electro-hydraulic driven direction finder for well deviation control, characterized in that it further comprises a gear box connected between the variable speed motor and the lead screw drive, wherein the gear box can support bidirectional continuous drive.

[0010] A planetary electro-hydraulic driven direction finder for well inclination control, characterized in that: if a valve or turbine is blocked or stuck, resulting in insufficient power, a cable can be passed through a continuous oil pipe to transmit electrical energy from the ground to the direction finder, reducing dependence on single power generation by the turbine. A slip ring connection box in the center tube for connecting the direction finder allows the cable to withstand a 360° rotation angle and also passes through the center tube to the output shaft.

[0011] A planetary electro-hydraulic driven orienter for well inclination control, characterized in that the planet carrier ensures that the rollers have the same spacing to avoid mutual friction affecting the stress state.

[0012] A planetary electro-hydraulic driven direction finder for well inclination control, characterized in that: the tool face orientation accuracy is 1°, the orientation range is 400°, it can rotate continuously, the rotation power comes from the drilling fluid flow through the turbine, and sufficient pump pressure and displacement are required.

[0013] The beneficial effects of the present invention are as follows: (1) by driving the turbine and the AC generator to generate AC power control, variable speed rotation can be achieved, which is convenient for better control of orientation, saves energy loss and improves orientation efficiency; (2) the planetary ball screw has a compact and reliable structure, good rigidity, adapts to harsh environments and supports bidirectional continuous rotation, the tool face orientation accuracy is high and the range is wide; (3) the "fishtail" phenomenon in drilling can be reduced, the distortion of the entire wellbore can be reduced, and the extension and solid completion operations of continuous tubing drilling are convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A schematic diagram of the cross-sectional structure of an electro-hydraulic driven direction finder of a planetary electro-hydraulic driven direction finder for well deviation control according to the present invention;

[0015] Figure 2 It is a partial assembly diagram of the planetary roller screw of the electro-hydraulic driven orienter of the planetary electro-hydraulic driven orienter for well deviation control of the present invention;

[0016] Figure 3 It is a partial exploded view of the planetary roller screw of the electro-hydraulic driven orienter of the planetary electro-hydraulic driven orienter for well deviation control of the present invention;

[0017] Figure 4 It is a partial cross-sectional enlarged view of a planetary roller screw of an electro-hydraulic driven orienter of a planetary electro-hydraulic driven orienter for well deviation control of the present invention;

[0018] Figure 5 A schematic diagram of a drilling system implemented by an electro-hydraulic driven directional tool of a planetary electro-hydraulic driven directional device for well deviation control according to the present invention;

[0019] Channel fluid 1, fluid rotary guide valve 2, turbine 3, AC generator 4, positioning sensor 5, electrical connection box 6, slip ring connector 7, speed motor 8, center tube 9, gear box 10, driver 11, first lead screw 12, input transmission shaft 13, drive bushing 14, long housing 15, nut bushing 16, set screw 17, main lead screw 18, roller 19, spline 20, planet carrier 21, output transmission shaft 22, O-ring 23, circlip 24, connecting housing 25. DETAILED DESCRIPTION

[0020] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described with reference to the accompanying drawings.

[0021] The specific embodiments of the present invention described herein are only used for the purpose of explaining the present invention and cannot be understood as limiting the present invention in any way. Under the guidance of the present invention, technicians can conceive of any possible changes based on the present invention, which should be regarded as belonging to the scope of the present invention. It should be noted that when an element is referred to as "arranged on" another element, it can be directly on the other element or there can also be a central element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be a central element at the same time. The terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection, or it can be a connection between the two elements, it can be directly connected, or it can be indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for illustrative purposes and do not represent the only implementation method.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0023] like Figure 1The figure shows a schematic diagram of the overall structure of the directional tool according to the technology of this subject. The matching line arrows illustrate how to connect the two ends of the input and output. The fluid 1 defines the input channel through the rotating guide valve 2, and the ball-casting device is lowered to 2 places to intercept the flow. The fluid 1 drives the turbine 3 to rotate. The main shaft of the turbine 3 is connected to the AC generator 4. The positions of the generator 4 and the center tube 9 are respectively monitored by sensors 5. The cable is connected from the generator 4 to the variable speed motor 8 through the electrical connection box 6. There is also a guide ring support between the center tube 9 and the variable speed motor 8. The gear box 10 is controlled by the variable speed motor 8. The driver 11 is connected to the gear box 10 and has a boss on one side for positioning. The variable speed motor 8, the gear box 10, and the driver 11 are all in close contact with the inner wall of the long housing 15. The first lead screw 12 and the housing 15 leave a rotatable gap internal space. Under the action of the driver 11, it rotates at a uniform speed or variable speed. It is supported by a bearing and the inner side is partially meshed with the drive bushing 14. There is no contact between the drive bushing 14 and the input shaft 13, and it can move freely along the axial direction under the rotation of the first lead screw 12. The driving bushing 14 is connected to the planetary screw nut bushing 16 at the bottom, and a set screw 17 is provided to strengthen the connection between the two parts. The spline 20 is located on the screw nut bushing 16 to constrain the rotation. The inner side of the roller 19 is meshed with the main screw 18, and the roller 19 moves in a planetary manner along the raceway. The outer sides of both ends of the roller 19 are meshed with the inner gear ring of the nut. The roller 19 is supported by a planetary carrier 21 at both ends. The roller 19 is in point contact with the main screw 18 and the nut 16, which can ensure the coordinated work of the roller 19 and the nut 16, and the main screw moves synchronously along the axial direction of the screw. There is a threaded connection between 18 and the input shaft 13, and the output is output to the output transmission shaft 22 at a low speed and high load. The fluid 1 finally flows through the channel outlet. There is a threaded connection between the output shaft housing 22 and the main screw 18, and two O-rings 23 are installed. The elastic retaining ring 24 is used to position the inner ring of the bearing. The main screw 18 is rotated at a low speed and high load to output the output transmission shaft 22. The fluid 1 finally flows through the channel outlet. The output shaft housing 25 is used to connect subsequent guide devices such as elbows and elbows, so that the drilling direction can be adjusted accurately to 1°.

[0024] When the slip ring connector box 7 is configured, the cable can adapt to the torsion angle of the directional tool up to 360°, so that the cable can be passed through the continuous tube to directly provide power to the motor 8 to drive the directional device. The directional data can also be quickly transmitted to the ground through the cable, and the control signal and electric energy can also be quickly transmitted from the ground to the directional device, reducing the dependence on the single power generation of the turbine.

[0025] like Figures 2 to 4 The planetary roller screw shown here mainly shows the structure of the planetary screw mechanism to correspond to Figure 1, the size ratio can be used as a reference but is not exclusive, wherein the planet carrier 21 ensures that the rollers 19 have the same spacing to avoid mutual friction affecting the stress state. The outer sides of the rollers 19 are meshed with the inner gear ring of the nut 16, and the rollers 19 are in point contact with the main screw 18 and the nut 16, which can ensure that the rollers 19 and the nut 16 work in coordination and move synchronously along the axial direction of the main screw 18, and the main screw 18 rotates and outputs at a low speed and high load, and the pitch of the main screw 18 thread is relatively larger than the pitch of the first screw 12 thread. The difference in rotation angle or speed between the screw drive 11 and the output shaft 22 depends on the pitch difference and inherent transmission ratio of the reducer device.

[0026] Reference Figure 5 An example of a curved well system is shown, in which a wellbore with an inclination section 254 is being formed. In the example of drilling shown, the drilling system includes a bottom hole assembly directional sub 200, which is sent downhole through a suitable transmission connection tool or drill collar 260. In the drilling operation shown, the drill bit 262 is powered by a positive displacement motor 265, and depending on the application, the motor 265 can work in conjunction with the curved housing 210 and the directional tool 200 to ultimately control the desired drilling direction.

[0027] The above description is only a preferred embodiment of the present invention and is not intended to limit the spirit and principle of the present invention. Any modifications, equivalent substitutions, improvements, etc. made should be included in the scope of the present invention.

Claims

1. A planetary electro-hydraulic driven directional device for well inclination control, the directional tool comprising a channel fluid (1), a fluid guide valve (2), a turbine (3), an AC generator (4), a positioning sensor (5), an electrical connection box (6), a slip ring connector (7), a variable speed motor (8), a central tube (9), a gear box (10), a driver (11), a first lead screw (12), an input transmission shaft (13), a drive bushing (14), a long housing (15), a nut bushing (16), a set screw (17), a main lead screw (18), a roller (19), a spline (20), a planet carrier (21), an output transmission shaft (22), an O-ring (23), an elastic retaining ring (24) and a connecting housing (25); The technical features thereof are as follows: the fluid (1) is defined as an input channel through a rotary guide valve (2), and a ball-dropping device is lowered to (2) to intercept the flow, the fluid (1) drives the turbine (3) to rotate, the main shaft of the turbine (3) is connected to an AC generator (4), the positions of the generator (4) and the center tube (9) are respectively monitored by sensors (5) and limited by built-in bosses of the housing (15), the cable is connected from the generator (4) to the variable speed motor (8) through an electrical connection box (6), there are also guide rings and bearings between the center tube (9) and the variable speed motor (8), and the gear box (10) is connected by a variable speed motor (11). The motor (8) is controlled, the driver (11) is connected to the gear box (10) and has a boss on one side for positioning, the variable speed motor (8), the gear box (10) and the driver (11) are all in close contact with the inner wall of the long housing (15), and each section of the long housing (15) is threadedly connected. The first lead screw (12) and the housing (15) have a rotatable gap internal space, and rotate at a constant speed or at a variable speed under the action of the driver (11). The first lead screw (12) is supported by a bearing and is meshed with a driving bushing (14) partly. There is no contact between the driving bushing (14) and the input shaft (13), and there is no contact between the first lead screw (12) and the housing (15). The roller (19) is freely movable in the axial direction under the rotation of the planetary screw (12). The driving bushing (14) is connected to the planetary screw nut bushing (16) at the bottom. A set screw (17) is provided to strengthen the connection between the two parts. A spline (20) is provided on the screw nut bushing (16) to limit its rotation. The inner side of the roller (19) is meshed with the main screw (18) and performs planetary motion along the raceway. The outer sides of the two ends of the roller (19) are meshed with the inner gear ring of the nut. The two ends of the roller (19) are supported by a planetary carrier (21). The roller (19) is in point contact with the main screw (18) and the nut (16). This can ensure that the roller (19) is in point contact with the main screw (18) and the nut (16). (19) and the nut (16) work in coordination, and synchronously move along the axial direction of the screw (18). The main screw (18) and the input shaft (13) are threadedly connected, and the output is output to the output transmission shaft (22) at a low speed and high load. The fluid (1) finally flows through the channel outlet. The output shaft housing (22) and the main screw (18) are threadedly connected, and two O-rings (23) are installed. The elastic retaining ring (24) is used to position the inner ring of the output bearing. The connecting housing (25) is used to connect subsequent guide devices such as elbows and elbow joints, so that the drilling direction can be adjusted accurately to every 1°.

2. A planetary electro-hydraulic driven direction finder for well deviation control according to claim 1, characterized in that: The pitch of the thread of the main screw (18) of the planetary roller screw is relatively larger than the pitch of the thread of the first screw (12), by 10 to 1000 times.

3. A planetary electro-hydraulic driven direction finder for well deviation control according to claim 1, characterized in that: The difference in rotation angle or speed between the screw drive (11) and the output shaft (22) depends on the pitch difference and the inherent transmission ratio of the reducer device.

4. A planetary electro-hydraulic driven direction finder for well deviation control according to claim 1, characterized in that: It further comprises a gear box (10) connected between the variable speed motor (8) and the screw drive (11), wherein the gear box (10) supports bidirectional continuous drive.

5. The planetary electro-hydraulic driven direction finder for well deviation control according to claim 1, characterized in that: If the valve (2) or turbine (3) is blocked or stuck, resulting in insufficient power, the cable can be passed through the continuous oil pipe to transmit electrical energy from the ground to the direction finder. The slip ring connection box (7) connected to the direction finder in the center tube (9) allows the cable to withstand a 360° rotation angle and can also pass through the center tube (9) to the output shaft (22).

6. A planetary electro-hydraulic driven direction finder for well deviation control according to claim 1, characterized in that: The planet carrier (21) ensures that the rollers (19) have the same spacing to avoid mutual friction affecting the stress state.

7. A planetary electro-hydraulic driven direction finder for well deviation control according to claim 1, characterized in that: The tool face has an orientation accuracy of 1° and an orientation range of 400°. It can rotate continuously. The rotation power comes from the power generated by the flow of drilling fluid flowing through the turbine (3), which requires sufficient pump pressure and displacement.

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