A mud driven rotary steerable drilling control system

Abstract

The present invention discloses a mud-driven directional drilling control system, which relates to the field of oil and gas drilling. The existing rotary directional drilling control system includes a generator, a motor, a pump, a rotary valve, etc., which has an extremely complex structure, poor reliability, and a high price; the system pressure is uncontrollable, and it is impossible to achieve refined directional drilling operations. The present invention relates to a mud-driven rotary directional drilling control system, which consists of an electromagnetic throttle valve, a radial thrust mechanism, a rotary directional tool mud pulse transmitter, an upper joint, a drill pipe, a battery, a power management module, a CPU, a measurement module, an amplifier controller group A, an electromagnetic pressure reducing valve, and a control valve group A. The core components of the present invention are only electromagnetic valves and amplifier controllers, and the control principle is simple and the reliability is good; the radial thrust mechanism is controlled by an electromagnetic valve, which avoids the use of high-temperature and high-pressure motors, pumps, dynamic seals, pressure compensation short sections and other expensive components, and the cost is low; the refined control of the radial thrust mechanism guide force can be achieved.

Description

Technical Field

[0001] The invention relates to the field of oil and gas drilling engineering, and in particular to a mud-driven rotary steerable drilling control system. Background Art

[0002] Long horizontal wells are an important means to promote the long-term economic development of shale gas. The formation of horizontal wells requires wellbore trajectory control. Currently, there are two main wellbore trajectory control technologies: bent screw sliding guidance and rotary guidance:

[0003] The cost of the bent screw sliding guidance technology is low, so my country's horizontal well guidance is still dominated by bent screw sliding guidance. For example, in 2020, the proportion of bent screw sliding guidance in Qinghai shale gas exceeded 83%. During the bent screw sliding guidance process, the drill string does not rotate, and the large friction resistance of the drill string is very easy to "support pressure", resulting in the ineffective transmission of drilling pressure. The mechanical drilling speed is usually only 1 / 10 to 1 / 5 of that of rotary drilling; "support pressure" makes it difficult to adjust and control the tool face, and the drilling time is reduced by more than 30%; and it is very easy to form a cuttings bed, with a high risk of adhesion and drill jamming.

[0004] Rotary steering technology is heavily dependent on imports and is expensive: the daily cost is 150,000 to 200,000 yuan. Calculated based on the average single well steering cycle of 45 days, the cost of rotary steering technology alone is 6.75 million to 9 million yuan, accounting for 10-20% of the total drilling cost. The outer diameter of the rotary steering tool is large, and the risk of stuck and economic risk is extremely high: the diameter of the wellbore of most production wells is 215.9 mm, the maximum diameter of the rotary steering is 210 mm, and the clearance is less than 6 mm, which is very easy to cause cuttings to get stuck and bury the drill. Therefore, at the 32nd National Natural Gas Academic Annual Conference in 2020, rotary steering technology was still listed as a typical bottleneck technology. In summary, rotary steering technology is the most effective means to solve the "support pressure" of long horizontal drilling, improve drilling efficiency, and shorten the well construction cycle.

[0005] The foreign rotary steerable systems mainly include directional patents such as US9556679B2, US9784036B2, US9528320, US9714564, US6109372B2, US9828804B2, and push-type patents such as US8672056B2, US9206644, US8672056B2, US7389830B2, and US9476263B2. These rotary steerable systems all adopt the drive and control modes of motor + pump + solenoid valve + push-block (hydraulic oil drive) and motor + rotary valve + push-block (mud drive). This type of control mode has the following main disadvantages:

[0006] (1) The demand for electric energy is large, and a generator is required. The motor's vibration resistance and speed control accuracy are high, which is difficult and the cost is high.

[0007] (2) This type of rotary guide involves multiple dynamic sealing structures such as generators, motors, pumps, and rotary valves. The structure is extremely complex and the reliability is poor;

[0008] (3) The system pressure of this type of control system is uncontrollable, and the guiding force of steerable drilling cannot be finely regulated. At the same time, these ultra-high temperature and ultra-high pressure motors, measurement and control circuits, high temperature and high pressure dynamic seals, pressure compensation short sections, etc. are all monopolized by foreign companies, forming a serious technical barrier, resulting in my country's rotary steering technology still being a bottleneck technology that has not been broken through.

[0009] Domestically, relevant rotary guide system patents such as CN201510134442.X, CN201810671572.0, and CN201811408149.8 have been applied for. Almost all of these patents adopt the driving and control modes of motor + pump + solenoid valve + push block (hydraulic oil drive) and motor + rotary valve + push block (mud drive), which are similar to foreign patents and also have technical difficulties such as uncontrollable guiding force, poor system reliability, and high cost.

[0010] Based on this, it is planned to invent a mud-driven steerable drilling control system to effectively solve the technical problems of the existing rotary steerable drilling system, such as uncontrollable steering force, poor system reliability and high cost. Summary of the invention

[0011] In order to overcome the shortcomings of the prior art, a mud-driven rotary steerable drilling control system is invented, which comprises a drill bit (1), an electromagnetic throttle valve (2), a radial thrust mechanism (3), a rotary steerable tool (4), a mud channel (5) inside the rotary steerable tool, a mud pulse transmitter (6), an annulus (7), an upper joint (8), a drill pipe (9), a battery / generator (10), a power management module (11), a CPU (12), a measurement module (13), an amplifier controller group A (14-1), an electromagnetic pressure reducing valve (15), and a control valve group A (16-1); the electromagnetic throttle valve (2) Installed between the drill bit (1) and the rotary steering tool (4), the system controls the pressure of the high-pressure mud in the mud channel (5) inside the rotary steering tool, thereby controlling the mud pressure of the control valve group A (16-1); an electromagnetic pressure reducing valve (15) is connected in series between the mud channel (5) inside the rotary steering tool and the control valve group A (16-1), so as to control the high-pressure mud pressure of the control valve group A (16-1); 1 to 4 two-position two-way electromagnetic cartridge valves A (17) are simultaneously connected to the left hydraulic chambers (307) and the electromagnetic pressure reducing valves (15) of 1 to 4 radial thrust mechanisms (3), forming a parallel relationship; 1 to 4 two-position two-way electromagnetic cartridge valves A (17) are ...), forming a parallel relationship; 1 to 4 two-position two-way electromagnetic cartridge valves A (17) are connected to the left hydraulic chambers (307) and the electromagnetic pressure reducing valve Four two-position two-way solenoid cartridge valves B (18) are simultaneously connected to the left hydraulic chambers (307) and the annulus (7) of one to four radial thrust mechanisms (3) to form a parallel relationship; a control valve group A (16-1) composed of the two-position two-way solenoid cartridge valves A (17) and the two-position two-way solenoid cartridge valves B (18) is controlled by an amplifier controller group A (14-1); the measuring module (13) is composed of a gyroscope (13-1), a magnetic flux meter (13-2), a gravity accelerometer (13-3), a mud pulse controller (13-4), a memory (13-5), and an in-pipe pressure sensor. The CPU (12) is connected to the gyroscope (13-1), magnetic flux meter (13-2), gravity accelerometer (13-3), mud pulse controller (13-4), memory (13-5), in-pipe pressure sensor (13-6), and out-pipe pressure sensor (13-7) in the measuring module (13) through lines to perform data transmission and signal control; the CPU (12) is connected to the amplifying controller (14) in the amplifying controller group A (14-1) through lines to perform data transmission and signal control.

[0012] The two-position two-way solenoid valve A (17) is a two-position two-way solenoid valve that is normally closed when the power is off, and the two-position two-way solenoid valve B (18) is a two-position two-way solenoid valve that is normally open when the power is off, so as to ensure that in the case of a power-off state or a measurement and control circuit failure, the left hydraulic chamber (307) is connected to the low-pressure mud in the annulus (7) and is disconnected from the high-pressure mud in the mud channel (5) inside the rotary steering tool, so as to ensure that the piston (303) is moved to the left under the elastic force of the spring (302), thereby causing the thrust block (305) to contract, thereby reducing the risk of drilling sticking in the well; at the same time, the consumption of electric energy in non-guided drilling operations is also reduced, so as to extend the service time of the rotary steering drilling system in the well.

[0013] The radial thrust mechanism A (3-1-1) is controlled by a control valve group D (16-4) composed of 1 to 4 parallel two-position two-way electromagnetic cartridge valves A (17) and 1 to 4 parallel two-position two-way electromagnetic cartridge valves B (18) to increase the liquid inlet and outlet speed of the left hydraulic chamber (307), thereby increasing the expansion and contraction frequency of the radial thrust mechanism A (3-1-1), improving the rotary steering control accuracy and speed, and realizing high-precision and high-speed drilling, while reducing the pressure of any one of the two-position two-way electromagnetic cartridge valves A (17) or the two-position two-way electromagnetic cartridge valve B ( 18) Failure and blockage risks; the control valve group D (16-4) is equipped with the same number of amplifying controllers (14) as the cartridge valves, wherein one two-position two-way solenoid cartridge valve A (17) or two-position two-way solenoid cartridge valve B (18) corresponds to one amplifying controller (14); or one to four parallel two-position two-way solenoid cartridge valves A (17) are equipped with one amplifying controller (14), and one to four parallel two-position two-way solenoid cartridge valves B (18) are equipped with one amplifying controller (14), thereby reducing the number of amplifying controllers (14) and improving synchronization.

[0014] The two-position two-way electromagnetic cartridge valve A (17) and the two-position two-way electromagnetic cartridge valve B (18) can be replaced by a two-position three-way electromagnetic cartridge valve (19); the function of the two-position three-way electromagnetic cartridge valve (19) is that when the power is off, the T port is connected to the left hydraulic chamber (307), ensuring that the piston (303) moves leftward under the elastic force of the spring (302), thereby prompting the thrust block (305) to contract, thereby reducing the risk of drilling sticking in the well; at the same time, it can also reduce the consumption of electric energy in non-guided drilling operations, thereby extending the downhole service time of the rotary guide drilling system.

[0015] When the right hydraulic chamber (308) is used to replace the spring (302), the piston (303) can move left and right with full hydraulic pressure. The left and right movement of the piston (303) in the 1 to 4 radial thrust mechanisms D (3-2-1) is controlled by a control valve group C (16-3) composed of a two-position four-way electromagnetic cartridge valve (20). When the two-position four-way electromagnetic cartridge valve (20) is powered off, the P port is connected to the right hydraulic chamber (308) and the T port is connected to the left hydraulic chamber (307). At this time, the right hydraulic chamber (308) is at high pressure and the left hydraulic chamber (307) is at low pressure, ensuring that the piston (303) moves left, thereby causing the thrust block (305) to contract, thereby reducing the risk of drilling sticking underground. At the same time, the consumption of electric energy in non-guided drilling operations is also reduced, thereby extending the underground service time of the rotary guide drilling system.

[0016] The radial thrust mechanism A (3-1-1) is controlled by a control valve group E (16-5) composed of 1 to 4 parallel two-position three-way electromagnetic cartridge valves (19) to increase the liquid inlet and outlet speed of the left hydraulic chamber (307), thereby increasing the expansion and contraction frequency of the radial thrust mechanism A (3-1-1), improving the rotary steering control accuracy and speed, achieving high-precision and high-speed drilling, and reducing the risk of failure and blockage of any one of the two-position three-way electromagnetic cartridge valves (19); the 1 to 4 parallel A control valve group E (16-5) composed of two-position three-way electromagnetic cartridge valves (19) connected in parallel is equipped with an amplifying controller group E (14-5) composed of 1 to 4 amplifying controllers (14), one two-position three-way electromagnetic cartridge valve (19) corresponding to one amplifying controller (14); or a control valve group E (16-5) composed of 1 to 4 two-position three-way electromagnetic cartridge valves (19) connected in parallel is equipped with one amplifying controller H (14-8), thereby reducing the number of amplifying controllers (14) and improving synchronization.

[0017] The radial thrust mechanism D (3-2-1) is controlled by a control valve group F (16-6) composed of 1 to 4 parallel two-position four-way electromagnetic cartridge valves (20) to increase the liquid inlet and outlet speeds of the left hydraulic chamber (307) and the right hydraulic chamber (308), thereby increasing the expansion and contraction frequency of the radial thrust mechanism D (3-2-1), improving the rotary steering control accuracy and speed, achieving high-precision and high-speed drilling, and reducing the risk of failure and blockage of any two-position four-way electromagnetic cartridge valve (20); A control valve group F (16-6) composed of 1 to 4 parallel two-position four-way solenoid cartridge valves (20) is equipped with an amplifying controller group F (14-6) composed of 1 to 4 amplifying controllers (14), one two-position four-way solenoid cartridge valve (20) corresponds to one amplifying controller (14); or a control valve group F (16-6) composed of 1 to 4 parallel two-position four-way solenoid cartridge valves (20) is equipped with one amplifying controller I (14-9), thereby reducing the number of amplifying controllers (14) and improving synchronization.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] (1) Compared with conventional generators, drive motors, high-pressure pumps, rotary valves, etc., the core components of the control system of the present invention are only solenoid valves and amplifier controllers, with simple control principles and good reliability.

[0020] (2) The extension and retraction of the radial thrust mechanism is controlled by an electromagnetic valve, which avoids the use of expensive components such as motors, pumps, high-temperature and high-pressure dynamic seals, and pressure compensation nipples, thereby reducing costs.

[0021] (3) The present invention installs an electromagnetic throttle valve between the drill bit and the rotary guide control tool. By controlling the throttling pressure of the electromagnetic throttle valve, the guide force of the radial thrust mechanism can be effectively controlled, thereby achieving refined control of the guide force of the radial thrust mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the mud-driven rotary steerable drilling control system of the present invention.

[0023] Figure 2 This is the schematic diagram of the two-position three-way solenoid valve mud-driven rotary steerable drilling control system.

[0024] Figure 3 This is the schematic diagram of the two-position four-way solenoid valve mud-driven rotary steerable drilling control system.

[0025] Figure 4 The schematic diagram of a control system for rotary steerable drilling with multiple two-position two-way solenoid valves connected in parallel to drive mud.

[0026] Figure 5 The schematic diagram of a control system for rotary steerable drilling with multiple two-position three-way solenoid valves connected in parallel to drive mud.

[0027] Figure 6 The schematic diagram of a control system for rotary steerable drilling with multiple two-position four-way solenoid valves connected in parallel to drive mud.

[0028] Figure 7 The schematic diagram of the mud-driven rotary steerable drilling control system is a single amplifier controller with multiple two-position two-way solenoid valves connected in parallel.

[0029] Figure 8 The schematic diagram of the mud-driven rotary steerable drilling control system is a single amplifier controller with multiple two-position three-way solenoid valves connected in parallel.

[0030] Fig. 9 The schematic diagram of the mud-driven rotary steerable drilling control system is a single amplifier controller with multiple two-position four-way solenoid valves connected in parallel.

[0031] In the figure: 1-drill bit, 2-electromagnetic throttle valve, 3-radial thrust mechanism, 3-1-1-radial thrust mechanism A, 3-1-2-radial thrust mechanism B, 3-1-3-radial thrust mechanism C, 3-2-1-radial thrust mechanism D, 3-2-2-radial thrust mechanism E, 3-2-3-radial thrust mechanism F, 301-plug, 302-spring, 303-piston, 304-connecting rod, 305-thrust block, 306 -body, 307-left hydraulic chamber, 308-right hydraulic chamber, 4-rotary steering tool, 5-mud channel inside the rotary steering tool, 6-mud pulse transmitter, 7-annulus, 8-upper joint, 9-drill pipe, 10-battery / generator, 11-power management module, 12-CPU, 13-measurement module, 13-1-gyroscope, 13-2-magnetic flux meter, 13-3-gravity accelerometer, 13-4-mud Pulse controller, 13-5-memory, 13-6-in-pipe pressure sensor, 13-7-out-pipe pressure sensor, 14-amplifier controller, 14-1-amplifier controller group A, 14-2-amplifier controller group B, 14-3-amplifier controller group C, 14-4-amplifier controller group D, 14-5-amplifier controller group E, 14-6-amplifier controller group F, 14-7-amplifier controller group G, 14-8-amplifier controller H, 14-9-amplifier controller I, 15-electromagnetic pressure reducing valve, 16-1-control valve group A, 16-2-control valve group B, 16-3-control valve group C, 16-4-control valve group D, 16-5-control valve group E, 16-6-control valve group F, 17-two-position two-way solenoid cartridge valve A, 18--two-position two-way solenoid cartridge valve B, 19-two-position three-way solenoid cartridge valve, 20-two-position four-way solenoid cartridge valve. DETAILED DESCRIPTION

[0032] In order to have a clearer understanding of the technical features, objectives and effects of the present invention, specific embodiments of the present invention are now described in conjunction with the accompanying drawings.

[0033] Depend on Figures 1 to 9As shown, this embodiment provides a mud-driven rotary steerable drilling control system, which comprises a drill bit (1), an electromagnetic throttle valve (2), a radial thrust mechanism (3), a rotary steerable tool (4), a mud channel (5) inside the rotary steerable tool, a mud pulse transmitter (6), an annulus (7), an upper joint (8), a drill pipe (9), a battery / generator (10), a power management module (11), a CPU (12), a measurement module (13), an amplifier controller group A (14-1), an electromagnetic pressure reducing valve (15), and a control valve group A (16-1); the electromagnetic throttle valve (2) is installed on the drill bit. A plurality of electromagnetic pressure reducing valves (15) are connected in series between the rotary guide tool internal mud channel (5) and the control valve group A (16-1) to control the high-pressure mud pressure of the control valve group A (16-1); one to four two-position two-way electromagnetic cartridge valves A (17) are simultaneously connected to the left hydraulic chambers (307) of one to four radial thrust mechanisms (3) and the electromagnetic pressure reducing valves (15) to form a parallel relationship; one to four two-position two-way electromagnetic cartridge valves A (17) are ... The two-position two-way electromagnetic cartridge valve B (18) is simultaneously connected to the left hydraulic chamber (307) and the annulus (7) of one to four radial thrust mechanisms (3) to form a parallel relationship; the control valve group A (16-1) composed of the two-position two-way electromagnetic cartridge valve A (17) and the two-position two-way electromagnetic cartridge valve B (18) is controlled by the amplifier controller group A (14-1); the measuring module (13) is composed of a gyroscope (13-1), a magnetic flux meter (13-2), a gravity accelerometer (13-3), a mud pulse controller (13-4), a memory (13-5), and an in-pipe pressure sensor (13-6), and an external pressure sensor (13-7); the CPU (12) is connected to a gyroscope (13-1), a magnetic flux meter (13-2), a gravity accelerometer (13-3), a mud pulse controller (13-4), a memory (13-5), an internal pressure sensor (13-6), and an external pressure sensor (13-7) in a measuring module (13) through lines for data transmission and signal control; the CPU (12) is connected to an amplifying controller (14) in an amplifying controller group A (14-1) through lines for data transmission and signal control.

[0034] Example 1: According to Figure 1The device is connected to a mud-driven directional drilling control system, wherein a gravity accelerometer (13-3) and a magnetic flux meter (13-2) measure the well inclination angle and the tool face angle in real time. If the measured well inclination angle is less than 10°, the CPU (12) turns off the gravity accelerometer (13-3) and turns on the magnetic flux meter (13-2). If the well inclination angle is greater than 10°, the CPU (12) turns off the magnetic flux meter (13-2) and turns on the gravity accelerometer (13-3) to improve the tool face angle measurement accuracy. When the in-pipe pressure sensor (13-6) measures the target tool face angle, the CPU (12) stores the target tool face angle in the memory (13-5) and controls the amplifier group A (14-1) to turn on and off. Specifically, when the radial thrust mechanism A (3-1-1) reaches the target tool face angle A±B (control angle), the two-position two-way solenoid valve A (17) and the two-position two-way solenoid valve B (18) are energized at the same time. At this time, the high-pressure mud in the mud channel (5) inside the rotary guide tool enters the left hydraulic chamber (307) of the radial thrust mechanism A (3-1-1) through the two-position two-way solenoid valve A (17). At the same time, the two-position two-way solenoid valve B (17) is closed to prevent the high-pressure fluid from flowing out. The 305-thrust block of the radial thrust mechanism A (3-1-1) is extended and supported on the well wall to rotate. The directional drilling system provides a guiding force to realize rotary directional drilling; when the radial thrust mechanism A (3-1-1) leaves the target tool face angle A±B (control angle) range, the two-position two-way electromagnetic cartridge valve A (17) and the two-position two-way electromagnetic cartridge valve B (18) are simultaneously powered off, at which time the high-pressure mud in the mud channel (5) inside the rotary directional tool enters the right hydraulic chamber (308) of the radial thrust mechanism A (3-1-1) through the two-position two-way electromagnetic cartridge valve B (18), the low-pressure mud in the annulus (7) is connected to the left hydraulic chamber (307), and the thrust block (305) of the radial thrust mechanism A (3-1-1) contracts.

[0035] Example 2: Figure 2As shown, a mud-driven directional drilling control system is connected, a gravity accelerometer (13-3) and a magnetic flux meter (13-2) are used to measure the well inclination angle and the tool face angle in real time. If the measured well inclination angle is less than 10°, the CPU (12) turns off the gravity accelerometer (13-3) and turns on the magnetic flux meter (13-2). If the well inclination angle is greater than 10°, the CPU (12) turns off the magnetic flux meter (13-2) and turns on the gravity accelerometer (13-3) to improve the measurement accuracy of the tool face angle. When the in-pipe pressure sensor (13-6) measures the target tool face angle A, the CPU (12) stores the target tool face angle in the memory (13-5) and controls the amplifier group B (14-2) to turn on and off. Specifically, when the radial thrust mechanism A (3-1-1) reaches the target tool face angle A±B (control angle), the two-position three-way electromagnetic cartridge valve (19) is energized. At this time, the high-pressure mud in the mud channel (5) inside the rotary guide tool enters the left hydraulic chamber (307) of the radial thrust mechanism A (3-1-1) through the two-position three-way electromagnetic cartridge valve (19). The radial thrust mechanism A (3-1-1) The thrust block (305) extends out and is supported on the well wall, providing a guiding force for the rotary steerable drilling system, thereby realizing rotary steerable drilling; when the radial thrust mechanism A (3-1-1) leaves the target tool face angle A±B (control angle) range, the two-position three-way electromagnetic cartridge valve (19) is powered off, and at this time, the high-pressure mud in the mud channel (5) inside the rotary steerable tool enters the right hydraulic chamber (308) of the radial thrust mechanism A (3-1-1) through the two-position three-way electromagnetic cartridge valve (19), and the low-pressure mud in the annulus (7) is connected to the left hydraulic chamber (307), and the thrust block (305) of the radial thrust mechanism A (3-1-1) contracts.

[0036] Example 3: Figure 3As shown, a mud-driven directional drilling control system is connected, a gravity accelerometer (13-3) and a magnetic flux meter (13-2) are used to measure the well inclination angle and the tool face angle in real time. If the measured well inclination angle is less than 10°, the CPU (12) turns off the gravity accelerometer (13-3) and turns on the magnetic flux meter (13-2). If the well inclination angle is greater than 10°, the CPU (12) turns off the magnetic flux meter (13-2) and turns on the gravity accelerometer (13-3) to improve the measurement accuracy of the tool face angle. When the in-pipe pressure sensor (13-6) measures the target tool face angle A, the CPU (12) stores the target tool face angle in the memory (13-5) and controls the amplifier group C (14-3) to turn on and off. Specifically, when the radial thrust mechanism A (3-1-1) reaches the target tool face angle A±B (control angle), the two-position four-way solenoid cartridge valve (20) is energized. At this time, the high-pressure mud in the mud channel (5) inside the rotary guide tool enters the left hydraulic chamber (307) of the radial thrust mechanism A (3-1-1) through the two-position four-way solenoid cartridge valve (20), and the low-pressure mud in the annulus (7) is connected to the right hydraulic chamber (308). The thrust block (305) of the thrust mechanism A (3-1-1) extends out and is supported on the well wall, providing a guiding force for the rotary steerable drilling system to achieve rotary steerable drilling; when the radial thrust mechanism A (3-1-1) leaves the target tool face angle A±B (control angle) range, the two-position four-way electromagnetic cartridge valve (20) is powered off, and at this time, the high-pressure mud in the mud channel (5) inside the rotary steerable tool enters the right hydraulic chamber (308) of the radial thrust mechanism A (3-1-1) through the two-position four-way electromagnetic cartridge valve (20), and the low-pressure mud in the annulus (7) is connected to the left hydraulic chamber (307), and the thrust block (305) of the radial thrust mechanism A (3-1-1) contracts.

[0037] The above description is only an illustrative embodiment of the present invention and is not intended to limit the scope of the present invention. Any equivalent changes and modifications made by any person skilled in the art without departing from the concept and principle of the present invention shall fall within the protection scope of the present invention.

Claims

1. A mud driven rotary steerable drilling control system, characterized in that: The invention comprises a drill bit (1), an electromagnetic throttle valve (2), a radial thrust mechanism (3), a rotary steering tool (4), a mud channel (5) inside the rotary steering tool, a mud pulse transmitter (6), an annulus (7), an upper joint (8), a drill pipe (9), a battery / generator (10), a power management module (11), a CPU (12), a measurement module (13), an amplifier controller group A (14-1), an electromagnetic pressure reducing valve (15), and a control valve group A (16-1); the electromagnetic throttle valve (2) is installed between the drill bit (1) and the rotary steering tool (4) to control the rotary steering tool. The pressure of the high-pressure mud in the mud channel (5) inside the tool is controlled, thereby controlling the mud pressure of the control valve group A (16-1); an electromagnetic pressure reducing valve (15) is connected in series between the mud channel (5) inside the rotary guide tool and the control valve group A (16-1) to control the high-pressure mud pressure of the control valve group A (16-1); 1 to 4 left hydraulic chambers (307) of the radial thrust mechanisms (3) are respectively connected in parallel with 1 to 4 two-position two-way electromagnetic cartridge valves A (17), and the two-way electromagnetic cartridge valves A (17) are connected to the annulus (7); the right hydraulic chambers (308) of the radial thrust mechanisms (3) One to four two-position two-way electromagnetic cartridge valves B (18) are connected in parallel, and the two-position two-way electromagnetic cartridge valves B (18) are connected to the electromagnetic pressure reducing valve (15); the control valve group A (16-1) composed of the two-position two-way electromagnetic cartridge valve A (17) and the two-position two-way electromagnetic cartridge valve B (18) is controlled by an amplifier controller group A (14-1); the measurement module (13) is composed of a gyroscope (13-1), a magnetic flux meter (13-2), a gravity accelerometer (13-3), a mud pulse controller (13-4), a memory (13-5), and an in-pipe pressure sensor (13 -6), and an external pressure sensor (13-7); the CPU (12) is connected to a gyroscope (13-1), a magnetic flux meter (13-2), a gravity accelerometer (13-3), a mud pulse controller (13-4), a memory (13-5), an internal pressure sensor (13-6), and an external pressure sensor (13-7) in a measuring module (13) through lines for data transmission and signal control; the CPU (12) is connected to an amplifying controller (14) in an amplifying controller group A (14-1) through lines for data transmission and signal control.

2. A mud driven rotary steerable drilling control system according to claim 1, characterized in that: The two-position two-way solenoid valve A (17) is a two-position two-way solenoid valve that is normally closed when the power is off, and the two-position two-way solenoid valve B (18) is a two-position two-way solenoid valve that is normally open when the power is off, so as to ensure that in the case of power off or measurement and control circuit failure, the left hydraulic chamber (307) remains connected to the low-pressure mud in the annulus (7) and remains disconnected from the high-pressure mud in the mud channel (5) inside the rotary steering tool, so as to ensure that the piston (303) moves to the left under the elastic force of the spring (302), thereby causing the thrust block (305) to contract, thereby reducing the risk of drill bit sticking in the well; at the same time, it also reduces the consumption of electric energy in non-guided drilling operations, so as to extend the service time of the rotary steering drilling system in the well.

3. A mud driven rotary steerable drilling control system according to claim 1, characterized in that: A radial thrust mechanism A (3-1-1) is controlled by a control valve group D (16-4) composed of 1 to 4 parallel two-position two-way electromagnetic cartridge valves A (17) and 1 to 4 parallel two-position two-way electromagnetic cartridge valves B (18) to increase the liquid inlet and outlet speed of the left hydraulic chamber (307), thereby increasing the expansion and contraction frequency of the radial thrust mechanism A (3-1-1), improving the rotary steering control accuracy and speed, and realizing high-precision and high-speed drilling. At the same time, the pressure of any one of the two-position two-way electromagnetic cartridge valves A (17) or the two-position two-way electromagnetic cartridge valve B (18) is reduced. 8) Failure and blockage risks; the control valve group D (16-4) is equipped with the same number of amplifying controllers (14) as the cartridge valves, wherein one two-position two-way solenoid cartridge valve A (17) or two-position two-way solenoid cartridge valve B (18) corresponds to one amplifying controller (14); or one to four parallel two-position two-way solenoid cartridge valves A (17) are equipped with one amplifying controller (14), and one to four parallel two-position two-way solenoid cartridge valves B (18) are equipped with one amplifying controller (14), thereby reducing the number of amplifying controllers (14) and improving synchronization.

4. A mud driven rotary steerable drilling control system according to claim 1, characterized in that: The two-position two-way solenoid cartridge valve A (17) and the two-position two-way solenoid cartridge valve B (18) are replaced by a two-position three-way solenoid cartridge valve (19); the function of the two-position three-way solenoid cartridge valve (19) is as follows: when the power is off, the T port is connected to the left hydraulic chamber (307), ensuring that the piston (303) moves leftward under the elastic force of the spring (302), thereby causing the thrust block (305) to contract, thereby reducing the risk of drilling stuck underground; at the same time, it also reduces the consumption of electric energy in non-guided drilling operations, thereby extending the underground service time of the rotary guide drilling system.

5. A mud driven rotary steerable drilling control system according to claim 1, characterized in that: When the right hydraulic chamber (308) is used to replace the spring (302), the piston (303) can move left and right with full hydraulic pressure. The left and right movement of the piston (303) in the radial thrust mechanism D (3-2-1) is controlled by the control valve group C (16-3) composed of a two-position four-way electromagnetic cartridge valve (20); when the two-position four-way electromagnetic cartridge valve (20) is powered off, the P port is connected to the right hydraulic chamber (308) and the T port is connected to the left hydraulic chamber (307). At this time, the right hydraulic chamber (308) is at high pressure and the left hydraulic chamber (307) is at low pressure, ensuring that the piston (303) moves left, thereby causing the thrust block (305) to contract, reducing the risk of drilling sticking underground; at the same time, it also reduces the consumption of electric energy in non-guided drilling operations, thereby extending the underground service time of the rotary guide drilling system.

6. A mud driven rotary steerable drilling control system according to claim 4, characterized in that: A radial thrust mechanism A (3-1-1) is controlled by a control valve group E (16-5) composed of 1 to 4 parallel two-position three-way electromagnetic cartridge valves (19) to increase the liquid inlet and outlet speed of the left hydraulic chamber (307), thereby increasing the expansion and contraction frequency of the radial thrust mechanism A (3-1-1), improving the rotary steering control accuracy and speed, achieving high-precision and high-speed drilling, and reducing the risk of failure and blockage of any one of the two-position three-way electromagnetic cartridge valves (19); the 1 to 4 parallel The control valve group E (16-5) composed of two-position three-way electromagnetic cartridge valves (19) is equipped with an amplifying controller group E (14-5) composed of 1 to 4 amplifying controllers (14), one two-position three-way electromagnetic cartridge valve (19) corresponds to one amplifying controller (14); or the control valve group E (16-5) composed of 1 to 4 parallel two-position three-way electromagnetic cartridge valves (19) is equipped with one amplifying controller H (14-8), thereby reducing the number of amplifying controllers (14) and improving synchronization.

7. A mud driven rotary steerable drilling control system according to claim 5, characterized in that: A radial thrust mechanism D (3-2-1) is controlled by a control valve group F (16-6) composed of 1 to 4 parallel two-position four-way electromagnetic cartridge valves (20) to increase the liquid inlet and outlet speeds of the left hydraulic chamber (307) and the right hydraulic chamber (308), thereby increasing the expansion and contraction frequency of the radial thrust mechanism D (3-2-1), improving the rotary steering control accuracy and speed, achieving high-precision and high-speed drilling, and reducing the risk of failure and blockage of any two-position four-way electromagnetic cartridge valve (20); the 1 to 4 parallel two-position four-way electromagnetic cartridge valves (20) are used to control the radial thrust mechanism D (3-2-1) and the control valve group F (16-6) to increase the liquid inlet and outlet speeds of the left hydraulic chamber (307) and the right hydraulic chamber (308), thereby increasing the expansion and contraction frequency of the radial thrust mechanism D (3-2-1), improving the rotary steering control accuracy and speed, and achieving high-precision and high-speed drilling, while reducing the risk of failure and blockage of any two-position four-way electromagnetic cartridge valve (20); A control valve group F (16-6) composed of four parallel two-position four-way solenoid cartridge valves (20) is equipped with an amplifying controller group F (14-6) composed of one to four amplifying controllers (14), one two-position four-way solenoid cartridge valve (20) corresponds to one amplifying controller (14); or a control valve group F (16-6) composed of one to four parallel two-position four-way solenoid cartridge valves (20) is equipped with one amplifying controller I (14-9), thereby reducing the number of amplifying controllers (14) and improving synchronization.

Images