Rotary steerable drilling control assembly and method

Abstract

This invention belongs to the field of oil and gas drilling technology, specifically relating to a rotary steerable drilling control component and method. The rotary steerable drilling control component is disposed within a drill collar and includes: a first short section fixedly disposed within the drill collar, wherein a turbine generator and a first non-contact conditioning plate are electrically connected to each other within the first short section; and a second short section rotatably disposed within the drill collar, wherein a torque motor, a second non-contact conditioning plate, and a stabilizing platform are electrically connected to each other within the second short section, wherein the rotor of the torque motor is fixedly connected to the first short section; wherein the first and second non-contact conditioning plates are configured to transmit electrical energy and data signals wirelessly.

Description

Technical Field

[0001] This invention belongs to the field of oil and gas drilling technology, specifically, it relates to a rotary steerable drilling control component and a rotary steerable drilling control method. Background Technology

[0002] Rotary steerable drilling systems are high-tech drilling systems in the oil and gas industry. The stabilization platform is the core of this technology, its main function being to create a relatively geostable platform within the system, unaffected by drill pipe rotation. This ensures the tool face of the steerable drilling tool remains stable during rotation, thus achieving the guiding function. A typical stabilization platform consists of a turbine generator, torque motor, electronics compartment, and telemetry and communication electronic systems.

[0003] The stabilizing platform controls the drilling direction according to pre-set instructions or down-the-way instructions. The stabilizing platform mainly controls the important parameter of tool face angle. During directional drilling, drilling fluid drives the wing ribs to extend in the specified direction and strike the well wall to generate thrust, so that the drilling tool drills in the designed direction; during straight drilling, the resultant force of the telescopic wing ribs extending evenly and sequentially to strike the well wall is equivalent to zero.

[0004] The turbine generator is essentially the system's power generator. It uses the flow of drilling fluid to drive a turbine, which generates electricity to power downhole tools. The turbine rotates clockwise. The generated alternating current is rectified, regulated, and filtered before supplying power to the electrical and electronic equipment throughout the platform. In addition to powering the system, the turbine generator also acts as a receiver for downlink commands. These commands are sent downhole by adjusting the drilling fluid flow rate. The platform's receiving circuitry detects changes in the generator's AC voltage and frequency, thus receiving the downlink control commands.

[0005] The torque motor rotates counterclockwise. It generates torque opposite to that of the turbine generator, and the control circuit keeps the shaft stable at a specified tool face angle. The CPU, after D / A conversion, synthesis, and PWM processing, controls the current of the MOSFET, i.e., the torque motor current, thereby adjusting the torque motor torque.

[0006] Above the torque motor is a sealed electronic compartment, which mainly consists of four functional circuits: power supply, detection, communication, and control. The electronic compartment contains a rate gyroscope for detecting the angular velocity and rotational trend of the stabilizing platform, a three-axis gravity accelerometer and a three-axis fluxgate magnetometer for calculating the well inclination angle and tool face angle, as well as downlink signal receiver circuitry, short-range communication, and control circuitry.

[0007] During operation, with the tool face angle as the control target, the conditioned signals from the gyroscope and accelerometer are first converted using an A / D converter. Then, the CPU calculates the rotational angular velocity, well inclination angle, and tool face angle. If the tool face angle is smaller than the preset angle, the CPU, through a control method, outputs a corresponding voltage from the D / A converter, which, after a series of transformations, drives a MOSFET to increase the current of the torque motor. This increases the torque, causing the tool itself to rotate counterclockwise, closer to the preset tool face angle, thus achieving a closed-loop adjustment. This allows the measured tool face angle to quickly track the target tool face angle. In short, the process of stabilizing the platform control is essentially the process of adjusting the torque motor current.

[0008] Conventional stabilization platforms are suspended inside the drill collar, integrating a turbine generator, torque motor, and electronics compartment. The entire stabilization platform is subject to various disturbances, including the counter-torque of the generator turbine, the counter-torque of the torque motor turbine, drilling fluid turbulence, and viscous resistance. In particular, the counter-torque of the generator turbine and torque motor turbine is also affected by factors such as displacement, resulting in numerous interference factors and significantly increasing the difficulty of control. Therefore, there is an urgent need to develop a device and method to reduce the control difficulty of stabilization platforms. Summary of the Invention

[0009] To address the technical problems described above, this invention aims to provide a rotary steerable drilling control component that can reduce the difficulty of controlling a stable platform.

[0010] This invention also proposes a rotary steerable drilling control method, which can reduce the control difficulty of a stable platform.

[0011] According to the present invention, a rotary steerable drilling control assembly is provided, disposed within a drill collar, comprising:

[0012] A first short section is fixedly installed inside the drill collar, and a turbine generator and a first non-contact conditioning plate are electrically connected to each other inside the first short section;

[0013] A second short section is rotatably disposed inside the drill collar. Inside the second short section are a torque motor, a second non-contact conditioning plate, and a stabilizing platform that are electrically connected to each other. The rotor of the torque motor is fixedly connected to the first short section.

[0014] The first and second non-contact conditioning boards are configured to transmit electrical energy and data signals wirelessly.

[0015] In one specific embodiment, a conditioning circuit is also provided in the first short section. The turbine generator is electrically connected to the first non-contact conditioning plate through the conditioning circuit. After the conditioning circuit processes the electrical energy generated by the turbine generator, it transmits it to the second non-contact conditioning plate through the first non-contact conditioning plate.

[0016] In one specific embodiment, a pulse and circuit are further provided in the first short section. The pulse and circuit are electrically connected to the turbine generator and the first non-contact conditioning board. The pulse and circuit are configured to detect changes in the AC voltage and frequency of the turbine generator and transmit them to the second non-contact conditioning board through the first non-contact conditioning board.

[0017] In one specific embodiment, the stabilization platform includes a motor drive circuit, a central control circuit, a data acquisition board, and sensors.

[0018] In one specific embodiment, the second non-contact conditioning board is connected to the data acquisition board and the sensor to transmit electrical energy; the second non-contact conditioning board is connected to the central control circuit to transmit electrical energy and data signals; the sensor is connected to the central control circuit through the data acquisition board to transmit data signals; the central control circuit is connected to the torque motor through the motor drive circuit to transmit command signals.

[0019] In one specific embodiment, the first short section is coaxially fixed inside the drill collar by a fastener.

[0020] In one specific embodiment, the housing of the turbine generator is fixedly connected to the first short section, and the turbine of the turbine generator is coaxially rotatably disposed on the outside of the first short section.

[0021] In one specific embodiment, the second short section is coaxially rotatably disposed inside the drill collar via a bearing, the housing of the torque motor is fixedly connected to the second short section, and the output shaft of the torque motor extends to the outside of the second short section, thereby being fixedly connected to the first short section.

[0022] In one specific embodiment, a seal is provided between the output shaft of the torque motor and the second short section.

[0023] In one specific embodiment, an upper disc valve is provided at the end of the second short section away from the first short section.

[0024] According to the present invention, a rotary steerable drilling control method is also provided, in which the electrical energy and data signals generated by the turbine generator are transmitted to the stabilization platform wirelessly using the rotary steerable drilling control component proposed according to the present invention.

[0025] Compared with the prior art, the advantages of this application are as follows.

[0026] This invention sets the turbine generator and the stabilization platform on the first and second short sections, respectively. The first short section is fixedly connected to the drill collar, and the second short section is connected to the drill collar when it rotates. Compared with the existing rotary steerable drilling system, this invention can eliminate the interference between the generator turbine and the torque motor turbine, thereby reducing the control difficulty of the stabilization platform, improving the control accuracy of the stabilization platform, reducing the response time, and providing support for rapid and accurate downhole drilling. Attached Figure Description

[0027] The invention will now be described with reference to the accompanying drawings.

[0028] Figure 1 This is a schematic diagram of an embodiment of the rotary steerable drilling control assembly proposed according to the present invention;

[0029] Figure 2 A control system diagram of the rotary steerable drilling control assembly according to the present invention is shown.

[0030] The reference numerals in the figure are as follows:

[0031] 10. Drill collar;

[0032] 20. First short section; 21. Turbine; 22. Turbine generator; 23. Seal; 201. Conditioning circuit; 202. First non-contact conditioning plate; 203. Pulse and circuit;

[0033] 30. First fastener;

[0034] 40. Second fastener;

[0035] 60. First bearing;

[0036] 70. Second short section; 701. Torque motor; 702. Motor drive circuit; 703. Second non-contact conditioning board; 704. Central control circuit; 705. Data acquisition board; 706. Accelerometer; 707. Fluxgate; 708. Gyroscope;

[0037] 80. Second bearing;

[0038] 90. Upper plate valve; 100. Rotary steerable drilling control assembly.

[0039] In this application, all drawings are schematic and are used only to illustrate the principles of the invention, and are not drawn to scale. Detailed Implementation

[0040] The invention will now be described with reference to the accompanying drawings.

[0041] It should be noted that the directional terms or qualifiers such as "left" and "right" used in this application are all specific to the referenced material. Figure 1In other words, they are not used to define the absolute position of the components involved, but can vary depending on the specific circumstances.

[0042] Figure 1 The structure of a rotary steerable drilling control assembly 100 according to the present invention is shown. Figure 1 As shown, the rotary steerable drilling control assembly 100 is disposed inside the drill collar 10 and mainly includes a first sub-section 20 and a second sub-section 70.

[0043] The first short section 20 has a cylindrical overall structure and is coaxially fixed inside the drill collar 10, forming an annular channel for drilling fluid flow between the outer wall of the first short section 20 and the inner wall of the drill collar 10. A turbine generator 22 and a first non-contact conditioning plate 202, which are electrically connected to each other, are disposed inside the first short section 20.

[0044] The second short section 70 has a cylindrical overall structure and is coaxially rotatably disposed inside the drill collar 10. An annular channel for drilling fluid flow is formed between the outer wall of the second short section 70 and the inner wall of the drill collar 10. A torque motor 701, a second non-contact conditioning plate 703, and a stabilizing platform, which are electrically connected to each other, are disposed within the second short section 70. The rotor of the torque motor 701 is fixedly connected to the first short section 20.

[0045] The first non-contact conditioning board 202 and the second non-contact conditioning board 703 are configured to transmit electrical energy and data signals wirelessly. The first non-contact conditioning board 202 and the second non-contact conditioning board 703 employ multi-stage filtering technology to achieve noise reduction, filtering, waveform conversion, waveform phase locking, and waveform inversion, thereby significantly improving the signal-to-noise ratio under high-temperature and vibration conditions downhole.

[0046] In this configuration, when the drilling fluid flows inside the drill collar 10, the turbine generator 22 can convert the kinetic energy of the drilling fluid into electrical energy, and then transmit the electrical energy to the second non-contact conditioning plate 703 wirelessly through the first non-contact conditioning plate 202. The second non-contact conditioning plate 703 then transmits the electrical energy to the stabilizing platform and torque motor 701, thereby powering the stabilizing platform and torque motor 701.

[0047] In one specific embodiment, a pulse and circuit 203 is further provided within the first short section 20, which is electrically connected to the turbine generator 22 and the first non-contact conditioning plate 202. The pulse and circuit 203 is configured to detect changes in the AC voltage and frequency of the turbine generator 22 and generate corresponding data signals, which are transmitted to the second non-contact conditioning plate 703 via the first non-contact conditioning plate 202.

[0048] In this setup, by adjusting the drilling fluid flow rate, downlink commands can be transmitted to the rotary steerable drilling control assembly 100. Specifically, the downlink commands and drilling fluid flow rates are mutually corresponding. When a downlink command needs to be transmitted to the rotary steerable drilling control assembly 100, the drilling fluid flow rate is adjusted to the flow rate corresponding to that command. As the drilling fluid flow rate changes, the AC voltage and frequency of the turbine generator 22 also change. The pulse and circuit 203 detects the changes in the AC voltage and frequency of the turbine generator 22 and generates a corresponding data signal. This data signal is then transmitted to the second non-contact conditioning plate 703 via the first non-contact conditioning plate 202. The second non-contact conditioning plate 703 then transmits the data signal to the stabilization platform, which controls the torque motor 701 to perform corresponding actions based on the data signal.

[0049] The present invention sets the turbine generator 22 and the stabilization platform on the first short section 20 and the second short section 70, respectively. Compared with the rotary steerable drilling system in the prior art, the present invention can eliminate the interference between the turbine 21 of the generator and the turbine of the torque motor, thereby reducing the control difficulty of the stabilization platform, improving the control accuracy of the stabilization platform, reducing the response time, and providing support for rapid and accurate drilling downhole.

[0050] In one specific embodiment, a conditioning circuit 201 is also provided within the first short section 20. The conditioning circuit 201 is configured to rectify, regulate, and filter the AC power generated by the turbine generator 22. The turbine generator 22 is electrically connected to the first non-contact conditioning board 202 through the conditioning circuit 201. After processing the electrical energy generated by the turbine generator 22, the conditioning circuit 201 transmits it to the second non-contact conditioning board 703 through the first non-contact conditioning board 202.

[0051] In one specific embodiment, the stabilization platform includes a motor drive circuit 702, a central control circuit 704, a data acquisition board 705, and sensors. In this embodiment, the sensors mainly include an accelerometer 706, a fluxgate magnetometer 707, and a gyroscope 708.

[0052] The second non-contact conditioning board 703 connects to the data acquisition board 705, accelerometer 706, fluxgate 707, and gyroscope 708. The electrical energy generated by the turbine generator 22 is transmitted to the second non-contact conditioning board 703 via the first non-contact conditioning board 202, and then the second non-contact conditioning board 703 transmits the electrical energy to the data acquisition board 705, accelerometer 706, fluxgate 707, and gyroscope 708.

[0053] The second non-contact conditioning board 703 is connected to the central control circuit 704. The electrical energy generated by the turbine generator 22 is transmitted from the first non-contact conditioning board 202 to the second non-contact conditioning board 703, which then transmits the electrical energy to the central control circuit 704. The pulse circuit 203 detects changes in the AC voltage and frequency of the turbine generator 22 and generates corresponding data signals. These data signals are then transmitted from the first non-contact conditioning board 202 to the second non-contact conditioning board 703, which in turn transmits the data signals to the central control circuit.

[0054] Accelerometer 706, fluxgate magnetometer 707, and gyroscope 708 are connected to central control circuit 704 via data acquisition board 705. Data signals acquired by accelerometer 706, fluxgate magnetometer 707, and gyroscope 708 are transmitted to data acquisition board 705, which then transmits these signals to central control circuit 704. Central control circuit 704 can calculate the spatial attitude of the stabilized platform, including inclination angle, azimuth angle, tool face angle, and rotational speed. For example, central control circuit 704 calculates the gravity tool face using data signals acquired by accelerometer 706 and the magnetic tool face using data signals acquired by fluxgate magnetometer 707, thus determining the current position of the stabilized platform.

[0055] The central control circuit 704 is connected to the torque motor 701 via the motor drive circuit 702. The central control circuit 704 adjusts the tool face of the torque motor 701 according to the tool face set by the downlink command, and provides corresponding signals to the motor drive circuit 702 to drive the torque motor 701. The motor drive circuit 702 includes modules such as power supply circuit, signal conversion, and power amplification. After receiving the signal from the central control circuit 704, the motor drive circuit 702 drives and controls the torque motor 701, quickly adjusting its position. An upper plate valve 90 is fixedly installed at the end of the second short section 70 furthest from the first short section 20, and a lower plate valve (not shown in the figure) is also fixedly installed inside the drill collar 10 to cooperate with the upper plate valve 90. Since the rotor of the torque motor 701 is fixedly connected to the first short section 20 and the drill collar 10, after the torque motor 701 rotates, the housing of the torque motor 701 will drive the second short section 70 to rotate relative to the drill collar 10, thereby causing the upper plate valve 90 to rotate relative to the lower plate valve. This completes the position adjustment of the upper plate valve 90 and the lower plate valve, further stabilizing the relative position of the drill pipe, completing the flow channel and position control of the fully rotary steerable platform, and realizing the function of obtaining different magnitudes of thrust based on the flow rate of drilling fluid in the flow channel, thus adjusting the drilling angle. Adjusting the drilling angle through the relative movement of the upper plate valve 90 and the lower plate valve is well known to those skilled in the art and will not be described further.

[0056] In one specific embodiment, the first short section 20 is coaxially fixed within the drill collar 10 by a fastener. For example... Figure 1As shown, the first short section 20 is coaxially fixed inside the drill collar 10 by the first fixing member 30 and the second fixing member 40, which are respectively located at both ends of the first short section 20. It is easy to understand that the first fixing member 30 and the second fixing member 40 have axially penetrating channels for drilling fluid to flow through them.

[0057] In one specific embodiment, the housing of the turbine generator 22 is fixedly connected to the first short section 20, and the turbine 21 of the turbine generator 22 is coaxially rotatably disposed on the outside of the first short section 20. When the drilling fluid flows through the annular channel between the first short section 20 and the drill collar 10, the drilling fluid can drive the turbine 21 to rotate, thereby enabling the turbine generator 22 to convert the kinetic energy of the drilling fluid into electrical energy.

[0058] In one specific embodiment, the second short section 70 is coaxially rotatably mounted within the drill collar 10 via a bearing. For example... Figure 1 As shown, the second short section 70 is coaxially and rotatably mounted inside the drill collar 10 via the first bearing 60 and the second bearing 80.

[0059] In one specific embodiment, the housing of the torque motor 701 is fixedly connected to the second short section 70, and the output shaft of the torque motor 701 extends axially to the outside of the second short section 70, thereby being fixedly connected to the first short section 20. It is readily understood that the output shaft of the torque motor 701 can also be fixedly connected to the drill collar 10 via a fixing element, wherein the output shaft of the torque motor 701 is fixed relative to the drill collar 10.

[0060] In one specific embodiment, a seal 23 is provided between the output shaft of the torque motor 701 and the second short section 70.

[0061] In one embodiment of the present invention, a rotary steerable drilling control method is provided, wherein electrical energy and data signals generated by a turbine generator 22 are transmitted wirelessly using the rotary steerable drilling control component provided according to the present invention. Figure 2 It transmits data to a stable platform via non-contact transmission.

[0062] This invention separates the turbine generator 22 from the stabilizing platform, reducing the control interference of the turbine generator 22 on the stabilizing platform and enabling precise and rapid control. Compared with traditional rotary steering technology, this invention has a simpler structure, lower cost, faster response speed, and better system stability, making it suitable for widespread application in the oil drilling field.

[0063] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0064] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0065] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0066] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the present invention. Although the present invention 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 make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A rotary steerable drilling control assembly, disposed within a drill collar (10), characterized in that, include: A first short section (20) is fixedly installed inside the drill collar (10), and a turbine generator (22) and a first non-contact conditioning plate (202) are electrically connected to each other inside the first short section (20); A second short section (70) is rotatably disposed within the drill collar (10). A torque motor (701), a second non-contact conditioning plate (703), and a stabilizing platform are electrically connected to each other within the second short section (70). The rotor of the torque motor (701) is fixedly connected to the first short section (20). The first non-contact conditioning board (202) and the second non-contact conditioning board (703) are configured to transmit electrical energy and data signals wirelessly.

2. The rotary steerable drilling control assembly according to claim 1, characterized in that, A conditioning circuit (201) is also provided in the first short section (20). The turbine generator (22) is electrically connected to the first non-contact conditioning plate (202) through the conditioning circuit (201). After the conditioning circuit (201) processes the electrical energy generated by the turbine generator (22), it transmits it to the second non-contact conditioning plate (703) through the first non-contact conditioning plate (202).

3. The rotary steerable drilling control assembly according to claim 1, characterized in that, A pulse and circuit (203) is also provided in the first short section (20), the pulse and circuit (203) being electrically connected to the turbine generator (22) and the first non-contact conditioning plate (202). The pulse and circuit (203) is configured to detect the AC voltage and frequency changes of the turbine generator (22) and transmit them to the second non-contact conditioning plate (703) through the first non-contact conditioning plate (202).

4. The rotary steerable drilling control assembly according to claim 1, characterized in that, The stabilization platform includes a motor drive circuit (702), a central control circuit (704), a data acquisition board (705), and sensors.

5. The rotary steerable drilling control assembly according to claim 4, characterized in that, The second non-contact conditioning board (703) connects the data acquisition board (705) and the sensor to transmit electrical energy; The second non-contact conditioning board (703) is connected to the central control circuit (704) and transmits electrical energy and data signals; The sensor is connected to the central control circuit (704) through the data acquisition board (705) to transmit data signals; The central control circuit (704) is connected to the torque motor (701) through the motor drive circuit (702) to transmit command signals.

6. The rotary steerable drilling control assembly according to any one of claims 1 to 5, characterized in that, The first short section (20) is coaxially fixed inside the drill collar (10) by a fastener.

7. The rotary steerable drilling control assembly according to claim 6, characterized in that, The housing of the turbine generator (22) is fixedly connected to the first short section (20), and the turbine (21) of the turbine generator (22) is coaxially rotatably disposed on the outside of the first short section (20).

8. The rotary steerable drilling control assembly according to any one of claims 1 to 5, characterized in that, The second short section (70) is coaxially rotatably disposed inside the drill collar (10) via a bearing. The housing of the torque motor (701) is fixedly connected to the second short section (70). The output shaft of the torque motor (701) extends to the outside of the second short section (70) and is thus fixedly connected to the first short section (20).

9. The rotary steerable drilling control assembly according to claim 8, characterized in that, A seal (23) is provided between the output shaft of the torque motor (701) and the second short section.

10. The rotary steerable drilling control assembly according to any one of claims 1 to 5, characterized in that, An upper valve (90) is provided at the end of the second short section (70) away from the first short section (20).

11. A rotary steerable drilling control method, characterized in that, Using the rotary steerable drilling control assembly according to any one of claims 1 to 10, the electrical energy and data signals generated by the turbine generator (22) are transmitted to the stabilization platform wirelessly.

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