Gas extraction production line for directional drilling of non-magnetic drill rod

Abstract

The invention discloses a gas extraction production line for directional drilling of a non-magnetic drill rod, relates to the technical field of coal mine gas extraction, and is used for solving the major problems which are not effectively solved in the existing gas extraction, in particular to the problems of difficult drilling, difficult hole forming and shallow drilling depth. The device comprises a directional drilling machine, a slurry pump truck, a measuring system and a drill bit assembly. Through precise track adjustment of the directional drilling machine, complex geological structures can be avoided, gas enrichment areas can be successfully drilled, and the problem of drilling difficulty is solved; efficient directional drilling steering and branching are achieved in cooperation with a specially-designed drill bit assembly, the drilling layout is optimized, the hole forming rate is increased, and the problem that hole forming is difficult is solved; by means of the stable torque transmission and guiding effects of the non-magnetic drill rod and in combination with the automatic rod replacing device, long-distance drilling can be achieved, the drilling depth is greatly increased, and the problem that the drilling depth is small is solved.

Description

Technical Field

[0001] This invention relates to the field of coal mine gas extraction technology, specifically, a gas extraction production line using non-magnetic drill rod directional drilling. Background Art

[0002] During coal formation, plant remains accumulate and are buried deep, undergoing complex biochemical and physicochemical changes. In this process, organic matter from the plants gradually transforms into coal, while simultaneously producing large amounts of methane-based gas. Some of this gas exists in a free state within the pores and fissures of the coal seam and surrounding rock, while some adheres to the coal surface in an adsorbed state.

[0003] Methane gas is found in coal seams and surrounding rock strata, and is associated with coal. Coal seams are the primary storage site for methane gas, and its content is closely related to factors such as the degree of coal metamorphism, burial depth, and geological structure. Generally speaking, the higher the degree of coal metamorphism and the greater the burial depth, the higher the methane content of the coal seam. In areas with complex geological structures, the occurrence and migration of methane gas are also significantly affected. For example, in some synclinal structural areas, methane gas tends to accumulate.

[0004] During coal mining, the original stress balance of the coal body is disrupted, leading to coal fragmentation and changes in pore structure. This causes a large amount of previously adsorbed gas to desorb and transform into a free state, releasing it into the mine space, which greatly increases the gas emission. If ventilation is inadequate or gas extraction measures are insufficient, gas can easily accumulate. When it reaches a certain concentration, it can trigger an explosion if it encounters a source of ignition, seriously threatening the safe production of the coal mine.

[0005] With the continued growth of global energy demand, coal, as a crucial basic energy source, is being mined on an ever-expanding scale. However, as coal mining depths gradually increase, the number of coal seams prone to coal and gas outbursts is also increasing, making gas disasters one of the key factors restricting safe coal mine production. Gas drainage, as a crucial means of preventing and controlling gas disasters, still faces many significant challenges that have not yet been effectively resolved.

[0006] Existing technologies for gas drainage drilling have significant shortcomings. Traditional drilling equipment faces extreme difficulty when encountering complex geological conditions, such as hard rock layers, faults, and folds. Ordinary drilling rigs have limited power and torque, making it difficult to effectively break rocks, resulting in slow drilling speeds or even halting drilling altogether – this is the problem of "drilling difficulty." For example, in some deep coal mines, when encountering hard quartzite layers, traditional drilling rigs often require hours or even days to barely drill a short distance, severely impacting the overall progress of gas drainage.

[0007] Meanwhile, existing technologies also face numerous challenges in borehole formation. Due to the lack of precise borehole trajectory control technology, boreholes are prone to deviation and fail to extend along the predetermined path, resulting in poor borehole quality and an inability to effectively penetrate gas-rich areas. Furthermore, in special geological areas such as soft coal seams or fractured zones, boreholes are highly susceptible to collapse and diameter reduction, making borehole formation exceptionally difficult. Statistics show that in some complex geological conditions, the borehole formation rate is even less than 50%, with a large number of boreholes being scrapped due to failure to form, resulting in a significant waste of resources.

[0008] Furthermore, existing gas drainage boreholes are generally shallow. On the one hand, the strength and stability of drill rods limit the increase in borehole depth. Ordinary drill rods are prone to bending, deformation, or even breakage during long-distance drilling, failing to provide stable torque transmission and guidance for the drill bit. On the other hand, as borehole depth increases, the difficulty of removing cuttings increases. Traditional cuttings removal methods cannot effectively remove rock cuttings from deep boreholes, leading to borehole blockage and further limiting the borehole depth. Currently, most gas drainage boreholes only reach a depth of a few hundred meters, far from meeting the needs of efficient gas drainage from deep coal seams.

[0009] In summary, the shortcomings of existing gas drainage technologies in drilling, hole formation, and drilling depth severely restrict the effectiveness and efficiency of gas drainage, thereby affecting coal mine safety. Therefore, it is necessary to develop a new type of gas drainage production line to solve technical problems such as difficult drilling, difficult hole formation, and shallow drilling depth, improve gas drainage efficiency, ensure safe coal mine production, and reduce the threat of gas disasters to coal mining. This invention, a non-magnetic drill rod directional drilling gas drainage production line, is based on this background. Through innovative design of key components such as the directional drilling rig, mud pump truck, measurement system, and drill bit assembly, it aims to overcome existing technical challenges and promote the advancement of gas drainage technology. Summary of the Invention

[0010] The purpose of this invention is to provide a gas extraction production line using a non-magnetic drill rod directional drilling system that solves the problem of gas extraction, effectively addresses the gas extraction difficulties caused by the increase in coal mining depth, significantly improves gas extraction efficiency, and ensures safe production in coal mines.

[0011] To achieve the above-mentioned technical objectives, the technical solution adopted by the present invention is as follows:

[0012] A gas extraction production line for non-magnetic drill rod directional drilling includes a directional drilling rig, mud pump truck, measurement system, and drill bit assembly;

[0013] The directional drilling rig is used for trajectory adjustment, composite rock breaking, feeding and pulling. It has a drive device and a control system that can precisely control the rotation and propulsion speed.

[0014] The mud pump truck is used for screw motor rotation and cuttings discharge. It is equipped with a mud pump, which can provide stable and sufficient power to the screw motor and effectively remove rock cuttings from the borehole.

[0015] The mud pumps used are high-flow, high-pressure pumps.

[0016] The measurement system is used for trajectory measurement and monitoring. It adopts high-precision measurement sensors and can measure the inclination and azimuth parameters of the borehole in real time, and transmit the measurement data to the operation terminal for display and analysis in real time.

[0017] The drill bit assembly, used for directional drilling steering and branching, includes a directional drill bit and a non-magnetic drill rod. The guiding angle of the directional drill bit can be flexibly adjusted within the range of 10 to 45 degrees to achieve precise control of the drilling direction and ensure drilling under complex geological conditions. The non-magnetic drill rod is used to connect to the directional drilling rig and provides stable torque transmission and guidance for the entire drilling process.

[0018] The non-magnetic drill rod is made of non-magnetic alloy material, which ensures that it will not deform or be damaged due to force during drilling. At the same time, the non-magnetic characteristics ensure the normal operation of the measurement system and will not interfere with the measurement data.

[0019] By adopting the above technical solutions, the precise trajectory adjustment of the directional drilling rig can avoid complex geological structures and successfully drill into gas-rich areas, solving the problem of "difficult drilling". With the help of specially designed drill bit components, efficient directional drilling turning and branching can be achieved, optimizing the drilling layout, improving the hole formation rate, and solving the problem of "difficult hole formation". With the help of the stable torque transmission and guiding effect of the non-magnetic drill rod, combined with the automatic rod changing device, long-distance drilling can be achieved, greatly increasing the drilling depth and solving the problem of "shallow drilling depth".

[0020] Directional drilling rigs specifically include the following working steps.

[0021] S1, Initial trajectory adjustment: The initial position, inclination angle and azimuth angle parameters of the borehole are obtained using the measurement system, and the data is input into the control system of the directional drilling rig as the reference for trajectory adjustment;

[0022] S2, Real-time monitoring and adjustment: During the drilling process, the measurement system continuously monitors the borehole trajectory parameters in real time and feeds the data back to the control system;

[0023] Once the trajectory deviates from the preset path, the control system quickly calculates adjustment parameters. Operators then control the power head angle adjustment device of the directional drilling rig to change the drilling direction of the drill rod, achieving precise trajectory adjustment.

[0024] S3, composite rock crushing: the directional drilling rig starts the directional drill bit, which drives the directional drill bit and the non-magnetic drill rod to rotate. The cutting teeth of the directional drill bit cut and grind the rock during the rotation, breaking the rock into small pieces.

[0025] S4, axial pressure assistance, applies axial pressure to the directional drilling rig while the directional drill bit rotates, allowing the cutting teeth of the directional drill bit to cut into the rock more effectively and enhancing the crushing effect; for rocks with higher hardness, high-pressure mud provided by the mud pump truck is simultaneously transported to the directional drill bit through the internal channel of the non-magnetic drill rod, using high-pressure jet to assist in crushing the rock and improve rock crushing efficiency.

[0026] S5, feed, as the rock breaks, the directional drilling rig pushes the directional drill bit and non-magnetic drill rod forward, allowing the directional drill bit to continue to penetrate deeper into the formation;

[0027] The feed rate is adjusted in real time based on factors such as rock hardness and borehole diameter to ensure a smooth and efficient drilling process.

[0028] S6, Pulling out: When a section of drilling is completed or the directional drill bit needs to be replaced, the directional drill will start pulling out, pulling the directional drill bit in the opposite direction and slowly pulling it out of the borehole.

[0029] During the extraction process, close attention must be paid to changes in the load of the directional drilling rig to prevent damage to the drill bit or stuck drill accidents caused by excessive resistance.

[0030] Compared with the prior art, the present invention,

[0031] First, it improves drilling efficiency and accuracy. Directional drilling rigs are equipped with high-precision drive devices that can precisely control the drill rod rotation speed and feed rate. Combined with real-time measurement system feedback, it achieves precise control of the borehole trajectory, ensuring that the borehole drills along the predetermined path, reducing ineffective drilling and improving drilling efficiency. The automatic drill rod changing device can complete drill rod replacement in a short time, eliminating the need for frequent manual operation, further improving drilling efficiency, reducing manpower input, and lowering labor intensity.

[0032] Secondly, the system optimizes mud usage and slag removal. The mud pump truck is equipped with a high-flow, high-pressure mud pump, which not only provides powerful performance for the screw motor but also efficiently removes slag, maintaining borehole cleanliness and ensuring smooth drilling. The mud purification system purifies and recycles the discharged mud, reducing mud consumption costs and minimizing environmental pollution.

[0033] Third, to ensure equipment stability and safety, the non-magnetic drill rod is made of high-strength non-magnetic alloy material with high yield strength, capable of withstanding complex stresses during drilling, ensuring it does not deform or get damaged, and does not interfere with the measurement system, thus ensuring stable equipment operation. The mud pump truck's emergency braking device responds quickly to abnormal pressure or flow, ensuring the safety of equipment and personnel. Attached Figure Description

[0034] The present invention can be further illustrated by the non-limiting embodiments given in the accompanying drawings;

[0035] Figure 1 This is a schematic diagram of the gas extraction production line frame of the non-magnetic drill rod directional drilling of the present invention;

[0036] Figure 2 This is a flowchart of the working steps of the directional drilling rig of the present invention;

[0037] Figure 3 This is a flowchart of the steps for adjusting the guide angle of the directional drill bit of the present invention. Detailed Implementation

[0038] To enable those skilled in the art to better understand the present invention, the technical solution of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0039] like Figure 1 , Figure 2 , Figure 3 As shown, the gas extraction production line for non-magnetic drill rod directional drilling includes a directional drilling rig, a mud pump truck, a measurement system, and a drill bit assembly.

[0040] The directional drilling rig is used for trajectory adjustment, composite rock breaking, feeding and pulling. It has a drive device and a control system that can precisely control the rotation and propulsion speed.

[0041] The mud pump truck is used for screw motor rotation and cuttings discharge. It is equipped with a mud pump, which can provide stable and sufficient power to the screw motor and effectively remove rock cuttings from the borehole.

[0042] The measurement system is used for trajectory measurement and monitoring. It adopts high-precision measurement sensors and can measure the inclination and azimuth parameters of the borehole in real time, and transmit the measurement data to the operation terminal for display and analysis in real time.

[0043] The drill bit assembly, used for directional drilling steering and branching, includes a directional drill bit and a non-magnetic drill rod. The guiding angle of the directional drill bit can be flexibly adjusted within the range of 10 to 45 degrees to achieve precise control of the drilling direction and ensure drilling under complex geological conditions. The non-magnetic drill rod is used to connect to the directional drilling rig and provides stable torque transmission and guidance for the entire drilling process.

[0044] To further define it, the directional drilling rig specifically includes the following working steps:

[0045] S1, Initial trajectory adjustment: The initial position, inclination angle and azimuth angle parameters of the borehole are obtained using the measurement system, and the data is input into the control system of the directional drilling rig as the reference for trajectory adjustment;

[0046] S2, Real-time monitoring and adjustment: During the drilling process, the measurement system continuously monitors the borehole trajectory parameters in real time and feeds the data back to the control system;

[0047] S3, composite rock crushing: the directional drilling rig starts the directional drill bit, which drives the directional drill bit and the non-magnetic drill rod to rotate. The cutting teeth of the directional drill bit cut and grind the rock during the rotation, breaking the rock into small pieces.

[0048] S4, axial pressure assistance, applies axial pressure to the directional drilling rig while the directional drill bit rotates, allowing the cutting teeth of the directional drill bit to cut into the rock more effectively and enhancing the crushing effect; for rocks with higher hardness, high-pressure mud provided by the mud pump truck is simultaneously transported to the directional drill bit through the internal channel of the non-magnetic drill rod, using high-pressure jet to assist in crushing the rock and improve rock crushing efficiency.

[0049] S5, feed, as the rock breaks, the directional drilling rig pushes the directional drill bit and non-magnetic drill rod forward, allowing the directional drill bit to continue to penetrate deeper into the formation;

[0050] S6, Pulling out: When a section of drilling is completed or the directional drill bit needs to be replaced, the directional drill will start pulling out, pulling the directional drill bit in the opposite direction and slowly pulling it out of the borehole.

[0051] Furthermore, the directional drilling rig also includes an automatic rod changing device, which can automatically disassemble the drill rod and connect a new drill rod after the drill rod reaches the set drilling depth; the rod changing time does not exceed 10 minutes, improving drilling efficiency.

[0052] Furthermore, the guiding angle of the directional drill bit is adjusted using the following specific steps:

[0053] A1, Unlocking mechanism: The control system issues a command to activate the unlocking device of the guide angle adjustment mechanism;

[0054] The device is electrically driven to release the lock on the current guide angle, allowing the guide portion of the directional drill bit to be angled.

[0055] A2, Angle Adjustment: Based on the calculated adjustment value, the control system drives the adjustment mechanism to work. During the adjustment process, the angle sensor monitors the change of the guide angle in real time and feeds the data back to the control system.

[0056] The device is electrically driven, and the motor drives the guide component to rotate precisely through gear transmission.

[0057] A3, Precise Calibration: As the guide angle approaches the set value, the control system gradually reduces the adjustment speed for precise fine-tuning. By comparing the data fed back from the angle sensor with the target guide angle value, it continuously makes minute adjustments until the guide angle reaches the precise set value.

[0058] A4. Locking Angle: After the guide angle is adjusted to the correct position, the control system issues a locking command, and the locking device quickly activates to lock the adjusted guide angle.

[0059] To prevent changes in angle due to vibration or stress during drilling.

[0060] A5. Confirm again. The measurement system collects the drilling trajectory parameters again to confirm whether the adjusted guide angle meets the construction requirements. If the angle deviation is within the allowable range, continue drilling. If the deviation exceeds the range, repeat the above adjustment steps until the drilling direction meets the design requirements.

[0061] The mud pump truck is also equipped with a mud purification system, which can filter and purify the discharged mud, removing rock debris and impurities. The purified mud can be recycled, and the slag content of the purified mud is less than 8%, effectively reducing the consumption cost of mud.

[0062] The drill bit assembly also includes a borehole reaming device, which can enlarge the borehole after drilling is completed to increase the effective area for gas extraction.

[0063] The outer surface of the non-magnetic drill rod is coated with a wear-resistant coating with a thickness of 1 to 5 mm, which effectively improves the wear resistance of the non-magnetic drill rod and extends its service life.

[0064] The directional drilling rig, mud pump truck, measurement system and drill bit assembly communicate with each other via wireless communication modules to exchange data and control commands, enabling remote monitoring and automated operation of the entire production line.

[0065] The mud pump truck is equipped with an emergency braking device. When the pressure or flow rate of the mud pump becomes abnormal, the emergency braking device can automatically stop the operation of the mud pump within 20 seconds. The emergency braking device ensures the safety of equipment and personnel.

[0066] The cutting teeth of the drill bit assembly are detachable, which facilitates timely replacement after the cutting teeth wear out, thus improving the continuity of drilling.

[0067] The above provides a detailed description of the gas extraction production line for directional drilling without magnetic drill rods provided by this invention. The specific embodiments are described only to aid in understanding the method and core ideas of this invention. It should be noted that those skilled in the art can make various improvements and modifications to this invention without departing from its principles, and these improvements and modifications also fall within the scope of protection of the claims of this invention.

Claims

1. A gas extraction production line using non-magnetic drill rod directional drilling, characterized in that: Includes directional drilling rigs, mud pump trucks, measurement systems, and drill bit assemblies; The directional drilling rig is used for trajectory adjustment, composite rock breaking, feeding and pulling. It has a drive device and a control system that can precisely control the rotation and propulsion speed. The mud pump truck is used for screw motor rotation and cuttings discharge. It is equipped with a mud pump, which can provide stable and sufficient power to the screw motor and effectively remove rock cuttings from the borehole. The measurement system is used for trajectory measurement and monitoring. It adopts high-precision measurement sensors and can measure the inclination and azimuth parameters of the borehole in real time, and transmit the measurement data to the operation terminal for display and analysis in real time. The drill bit assembly, used for directional drilling steering and branching, includes a directional drill bit and a non-magnetic drill rod. The guiding angle of the directional drill bit can be flexibly adjusted within the range of 10 to 45 degrees to achieve precise control of the drilling direction and ensure drilling under complex geological conditions. The non-magnetic drill rod is used to connect to the directional drilling rig and provides stable torque transmission and guidance for the entire drilling process.

2. The gas extraction production line for non-magnetic drill rod directional drilling according to claim 1, characterized in that: The directional drilling rig specifically includes the following working steps. S1, Initial trajectory adjustment: The initial position, inclination angle and azimuth angle parameters of the borehole are obtained using the measurement system, and the data is input into the control system of the directional drilling rig as the reference for trajectory adjustment; S2, Real-time monitoring and adjustment: During the drilling process, the measurement system continuously monitors the borehole trajectory parameters in real time and feeds the data back to the control system; S3, composite rock crushing: the directional drilling rig starts the directional drill bit, which drives the directional drill bit and the non-magnetic drill rod to rotate. The cutting teeth of the directional drill bit cut and grind the rock during the rotation, breaking the rock into small pieces. S4, Axial Pressure Assist: While the directional drill bit rotates, the directional drilling machine applies axial pressure, which makes the cutting teeth of the directional drill bit cut into the rock more effectively and enhances the crushing effect. For rocks with high hardness, high-pressure mud provided by a mud pump truck is transported to the directional drill bit through the internal channel of the non-magnetic drill rod. The high-pressure jet helps to break the rock and improves the rock breaking efficiency. S5, feed, as the rock breaks, the directional drilling rig pushes the directional drill bit and non-magnetic drill rod forward, allowing the directional drill bit to continue to penetrate deeper into the formation; S6, Pulling out: When a section of drilling is completed or the directional drill bit needs to be replaced, the directional drill will start pulling out, pulling the directional drill bit in the opposite direction and slowly pulling it out of the borehole.

3. The gas extraction production line for non-magnetic drill rod directional drilling according to claim 2, characterized in that: The directional drilling rig also includes an automatic rod changing device, which can automatically disassemble the drill rod and connect a new drill rod after the drill rod reaches the set drilling depth.

4. The gas extraction production line for non-magnetic drill rod directional drilling according to claim 3, characterized in that: The specific steps for adjusting the guide angle of the directional drill bit are as follows. A1, Unlocking mechanism: The control system issues a command to activate the unlocking device of the guide angle adjustment mechanism; A2, Angle Adjustment: Based on the calculated adjustment value, the control system drives the adjustment mechanism to work. During the adjustment process, the angle sensor monitors the change of the guide angle in real time and feeds the data back to the control system. A3, Precise Calibration: As the guide angle approaches the set value, the control system gradually reduces the adjustment speed for precise fine-tuning. By comparing the data fed back from the angle sensor with the target guide angle value, it continuously makes minute adjustments until the guide angle reaches the precise set value. A4. Locking Angle: After the guide angle is adjusted to the correct position, the control system issues a locking command, and the locking device quickly activates to lock the adjusted guide angle. A5. Confirm again. The measurement system collects the drilling trajectory parameters again to confirm whether the adjusted guide angle meets the construction requirements. If the angle deviation is within the allowable range, continue drilling. If the deviation exceeds the range, repeat the above adjustment steps until the drilling direction meets the design requirements.

5. The gas extraction production line for non-magnetic drill rod directional drilling according to claim 4, characterized in that: The mud pump truck is also equipped with a mud purification system, which can filter and purify the discharged mud, remove rock debris and impurities from the mud, and the purified mud can be recycled. The slag content of the purified mud is less than 8%, which effectively reduces the consumption cost of mud.

6. The gas extraction production line for non-magnetic drill rod directional drilling according to claim 5, characterized in that: The drill bit assembly also includes a borehole reaming device, which can perform borehole reaming operation after drilling is completed to increase the effective area of ​​gas extraction.

7. The gas extraction production line for non-magnetic drill rod directional drilling according to claim 6, characterized in that: The outer surface of the non-magnetic drill rod is provided with a wear-resistant coating with a thickness of 1 to 5 mm, which effectively improves the wear resistance of the non-magnetic drill rod and extends its service life.

8. The gas extraction production line for non-magnetic drill rod directional drilling according to claim 7, characterized in that: The directional drilling rig, mud pump truck, measurement system, and drill bit assembly communicate with each other via a wireless communication module to exchange data and control commands, enabling remote monitoring and automated operation of the entire production line.

9. The gas extraction production line for non-magnetic drill rod directional drilling according to claim 8, characterized in that: The mud pump truck is equipped with an emergency braking device. When the pressure or flow rate of the mud pump becomes abnormal, the emergency braking device can automatically stop the operation of the mud pump within 20 seconds.

10. The gas extraction production line for non-magnetic drill rod directional drilling according to claim 9, characterized in that: The cutting teeth of the drill bit assembly are detachably connected, which facilitates timely replacement after the cutting teeth wear out, thereby improving the continuity of drilling.

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