A device and method for detecting gas content in a directional hole based on bottom hole gas outburst

Abstract

The present invention belongs to the field of coal mining and coal mine safety technology, and relates to a directional borehole gas content detection device and method based on bottom hole gas outburst, including a device shell, a rubber tube mechanism, an action mechanism, and a temperature and pressure testing mechanism. The device shell is a hollow cylindrical structure, provided with an upper joint and a lower joint, and the water channel is closed by throttling the pressure difference, and the water pressure control mechanism is actuated to realize the expansion of the rubber tube to seal the bottom of the borehole, and the temperature and pressure testing mechanism detects the gas outburst parameters of the closed space at the bottom of the hole. The present invention quickly blocks a small area at the bottom of the hole, detects the gas outburst parameters in the bottom hole space, and uses the measured gas outburst parameters to invert the gas content of the coal seam at the detection point. It can obtain the distribution of coal seam gas content revealed by directional drilling while drilling, and realizes indirect, rapid, and multi-point acquisition of coal seam gas content parameters to guide the design and implementation of gas control measures. It is of great significance to improve the effect of gas control and realize accurate and efficient gas extraction, thereby ensuring safe production in mines.

Description

Technical Field

[0001] The invention belongs to the technical field of coal mining and coal mine safety, and relates to a device and method for detecting gas content in a directional hole based on gas outburst at the hole bottom. Background Art

[0002] Detecting and understanding the distribution of gas content in coal seams revealed by directional drilling is the basis for optimizing the design of gas extraction boreholes, supporting targeted permeability enhancement methods such as long-hole directional fracturing and hydraulic fracturing, improving the effectiveness of large-area gas prevention and control, and achieving precise and efficient gas extraction. For established directional long-hole drilling processes such as hard coal directional drilling and comb-drilling of the roof (floor) of crushed soft coal seams, the drilling length is generally greater than 300m. The use of traditional coal seam gas parameter measurement methods for directional long-hole coal seam gas parameter measurement has problems such as complex operation, large sampling workload, few measurement points, and small control areas. This can easily lead to misjudgment of regional outburst hazards and inability to accurately calculate the total amount of coal seam gas resources, affecting the design and implementation of gas control measures and detrimental to mine safety production. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide a directional hole gas content detection device and method based on hole bottom gas outburst, to achieve rapid sealing of the annular space at the bottom of the hole, to detect the gas outburst parameters of the closed space at the bottom of the hole, thereby indirectly obtaining the coal seam gas content, and realizing multi-point detection of the closed space at the bottom of a directional long borehole while drilling, that is, being able to obtain multi-point gas content.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a directional hole gas content detection device based on hole bottom gas outburst, comprising a device shell, a rubber cylinder mechanism, an action mechanism, and a temperature and pressure testing mechanism. The device shell is a hollow cylindrical structure, provided with an upper joint and a lower joint. The rubber cylinder mechanism is installed on the outside of the device shell near the upper joint end. The action mechanism is limited by the device shell to the hollow part of the device shell and can only move axially along the device shell. The temperature and pressure testing mechanism comprises a temperature and pressure testing mechanism shell, an air chamber and a tester. The temperature and pressure testing mechanism shell is fixed to the inside of the device shell near the lower joint end; the water channel is closed by throttling the pressure difference, and the water pressure control mechanism is actuated to realize the expansion of the rubber cylinder to seal the bottom of the borehole, and the temperature and pressure testing mechanism detects the gas outburst parameters in the enclosed space at the bottom of the hole.

[0005] Optionally, the rubber cylinder mechanism includes a sliding sleeve, two rubber cylinder fixing blocks, a rubber cylinder, a pressure relief joint and a rubber cylinder core shaft. The rubber cylinder is fixed to the outer wall of the rubber cylinder core shaft through the sliding sleeve and the rubber cylinder fixing block, and the pressure relief joint is connected to the rubber cylinder core shaft and the rubber cylinder fixing block.

[0006] Optionally, a first flow guide hole, a pressure relief hole, a first gas channel and a second flow hole are provided on the device housing.

[0007] Optionally, the action mechanism includes a throttling thrust push rod, a large reset spring, a push rod and a small reset spring. The throttling thrust push rod is provided with a throttling hole and a second guide hole near the upper joint end, and a first flow hole is provided near the push rod end; the large reset spring is installed on the outside of the throttling push rod, and the throttling push rod and the device casing work together to achieve positioning; the push rod is installed on the outside of the throttling thrust push rod end near the temperature and pressure test mechanism, and moves axially along the device casing between the device casing and the temperature and pressure test mechanism.

[0008] Optionally, the push rod is provided with a second gas channel, a piston is provided near the lower joint end of the push rod, and a small reset spring is installed on the outside of the temperature and pressure test mechanism. The limit is achieved by the joint action of the push rod and the temperature and pressure test mechanism shell.

[0009] Optionally, the housing of the temperature and pressure testing mechanism is provided with a third gas channel, and an air chamber connected to the third gas channel and a tester installation slot are provided inside, and the tester is installed in the tester installation slot.

[0010] Optionally, a temperature sensor and a pressure sensor are provided near the air chamber end of the tester for collecting the temperature and air pressure in the air chamber.

[0011] A method for detecting gas content in a directional hole based on bottom hole gas outburst is provided, using the above-mentioned device for detecting gas content in a directional hole based on bottom hole gas outburst, and includes the following steps:

[0012] S1, installation preparation: Assemble the housing, rubber cylinder mechanism, action mechanism, temperature and pressure test mechanism and other components in sequence, and install them between the bottom hole motor and the lower non-magnetic drill rod, with the lower joint installed close to the bottom hole motor;

[0013] S2, directional drilling: Directional drilling is carried out normally according to the directional drilling construction process to the designed detection position. During normal directional drilling, water inside the drill pipe flows through the throttling hole, the first flow hole, and the second flow hole, and passes through the directional hole gas content detection device where gas gushes out from the bottom of the hole. The resulting throttling pressure difference is insufficient to compress the large reset spring. During the entire normal drilling process, the directional hole gas content detection device based on the gas gushes out from the bottom of the hole is in an inoperative state. In this state, the first guide hole and the second guide hole are not connected, and the push rod piston isolates the first gas channel from the third gas channel and seals the third gas channel to prevent water from entering the gas chamber.

[0014] S3, while drilling measurement: stop drilling and continue to inject water to remove slag until the drill cuttings are completely removed from the bottom of the hole, increase the flow rate of the pump outside the hole to above the normal working flow rate, and set the upper limit pressure of the pump to value A; when the water flow in the drill pipe increases, the throttling pressure difference generated by the water flow through the throttling hole will compress the reset spring to a certain stroke, and the first flow hole near the end of the throttling thrust push rod near the temperature and pressure test mechanism will slide into the annular sliding groove set between the shell of the temperature and pressure test mechanism and the push rod, thereby cutting off the water flow inside the drill pipe, causing the pressure of the pump outside the hole to increase; the increased water pressure acts on the throttling thrust push rod to push the reset spring to full stroke, and at the same time, the throttling thrust push rod The temperature and pressure test piston is pushed in, and the small reset spring is compressed. At this time, the first guide hole and the second guide hole are aligned and connected, and the first gas channel, the second gas channel, and the third gas channel are connected. The upper limit pressure of the pump is set to value B. The water inside the drill pipe enters the space between the device housing and the rubber cylinder mechanism through the first guide hole and the second guide hole, causing the rubber cylinder to expand, thereby sealing the annular space between the drill hole and the device outer clamp, forming a closed space from the rubber cylinder to the bottom of the drill hole. The gas in the closed space flows into the air chamber through the first gas channel, the second gas channel, and the third gas channel. The tester collects the gas outflow parameters in the air chamber and stores them in the temperature and pressure tester.

[0015] S4, continue drilling: After the measurement of a measuring point is completed, the pressure of the external hole pump is removed, the large reset spring resets the throttling thrust rod, and the small reset spring resets the temperature and pressure test piston; the external hole pump is adjusted to the normal drilling working state, and the drilling construction is continued according to the directional drilling construction process;

[0016] S5, multi-point measurement: when the drilling is re-constructed to the designed detection position, repeat S3 and S4 to achieve multi-point continuous measurement;

[0017] S6. After the entire drilling construction is completed, the drilling tool is withdrawn and the measuring device is disassembled. The measured data is read from the tester, and the coal seam gas content is calculated based on the bottom hole gas emission parameters to complete the measurement work.

[0018] Optionally, the B value of the upper limit pressure of the pump is set to be greater than the A value.

[0019] The beneficial effects of the present invention are: the present invention provides a directional hole gas content detection device and method based on hole bottom gas outburst, which quickly blocks a small space at the hole bottom, detects the gas outburst parameters in the hole bottom space, and inverts the coal seam gas content at the detection point with the measured gas outburst parameters, and can obtain the coal seam gas content distribution revealed by the directional drilling hole while drilling, thereby realizing indirect, rapid, and multi-point acquisition of coal seam gas content parameters to guide the design and implementation of gas control measures, which is of great significance to improving the gas control effect and realizing accurate and efficient gas extraction, thereby ensuring safe production in mines.

[0020] Other advantages, objects, and features of the present invention will be described in part in the following description and, in part, will be apparent to those skilled in the art upon examination of the following description or may be learned from practice of the present invention. The objects and other advantages of the present invention may be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below with reference to the accompanying drawings, in which:

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0023] Figure markings: device housing 1, upper joint 2, lower joint 3, first flow guide hole 4, pressure relief hole 5, first gas channel 6, second flow hole 7, throttling thrust push rod 8, large return spring 9, push rod 10, small return spring 11, throttling hole 12, second flow guide hole 13, first flow hole 14, second gas channel 15, piston 16, temperature and pressure test mechanism housing 17, third gas channel 18, air chamber 19, tester 20. DETAILED DESCRIPTION

[0024] The following describes the embodiments of the present invention by means of specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0025] Among them, the accompanying drawings are only for illustrative purposes and represent only schematic diagrams rather than actual pictures, and should not be understood as limiting the present invention. In order to better illustrate the embodiments of the present invention, some parts of the accompanying drawings may be omitted, enlarged or reduced, and do not represent the dimensions of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions may be omitted in the accompanying drawings.

[0026] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "back", etc. indicating directions or positional relationships, they are based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0027] See also Figure 1 , is a directional hole gas content detection device based on hole bottom gas outburst, including a device shell 1, a rubber cylinder mechanism, an action mechanism, and a temperature and pressure testing mechanism. The device shell 1 is a hollow cylindrical structure, provided with an upper joint 2 and a lower joint 3. The rubber cylinder mechanism is installed on the outside of the device shell 1 near the upper joint 2 end. The action mechanism is limited by the device shell 1 to the hollow part of the device shell 1 and can only move axially along the device shell 1. The temperature and pressure testing mechanism includes a temperature and pressure testing mechanism shell 17, an air chamber 19 and a tester 20. The temperature and pressure testing mechanism shell 17 is fixed to the inside of the device shell 1 near the lower joint 3 end; the water channel is closed by throttling the pressure difference, and the water pressure control mechanism is activated to realize the expansion of the rubber cylinder to seal the bottom of the borehole, and the temperature and pressure testing mechanism detects the gas outburst parameters in the enclosed space at the bottom of the hole.

[0028] Optionally, the rubber cylinder mechanism includes a sliding sleeve, two rubber cylinder fixing blocks, a rubber cylinder, a pressure relief joint and a rubber cylinder core shaft. The rubber cylinder is fixed to the outer wall of the rubber cylinder core shaft through the sliding sleeve and the rubber cylinder fixing block, and the pressure relief joint is connected to the rubber cylinder core shaft and the rubber cylinder fixing block.

[0029] Optionally, the device housing 1 is provided with a first flow guide hole 4 , a pressure relief hole 5 , a first gas channel 6 and a second flow hole 7 .

[0030] Optionally, the action mechanism includes a throttling thrust push rod 8, a large reset spring 9, a push rod 10 and a small reset spring 11. The throttling thrust push rod 8 is provided with a throttling hole 12 and a second flow guide hole 13 at the end near the upper joint 2, and a first flow hole 14 is provided at the end near the push rod 10; the large reset spring 9 is installed on the outside of the throttling push rod 10, and the throttling push rod 10 and the device housing 1 work together to achieve position limiting; the push rod 10 is installed on the outside of the throttling thrust push rod 8 end near the temperature and pressure test mechanism, and moves axially along the device housing 1 between the device housing 1 and the temperature and pressure test mechanism. The push rod 10 is provided with a second The gas channel 15, a piston 16 is provided at the end of the push rod 10 near the lower joint 3, and the small reset spring 11 is installed on the outside of the temperature and pressure test mechanism. The limit is achieved by the joint action of the push rod 10 and the temperature and pressure test mechanism shell 17. The temperature and pressure test mechanism shell 17 is provided with a third gas channel 18, and an air chamber 19 connected to the third gas channel 18 and a tester 20 installation groove are provided inside. The tester 20 is installed in the tester 20 installation groove. The tester 20 is provided with a temperature sensor and a pressure sensor near the air chamber 19 for collecting the temperature and air pressure in the air chamber 19.

[0031] A method for detecting gas content in a directional hole based on bottom hole gas outburst is provided, using the above-mentioned device for detecting gas content in a directional hole based on bottom hole gas outburst, and includes the following steps:

[0032] S1, installation preparation: Assemble the housing, rubber cylinder mechanism, action mechanism, temperature and pressure test mechanism and other components in sequence, and install them between the bottom hole motor and the lower non-magnetic drill rod, with the lower joint 3 installed close to the bottom hole motor;

[0033] S2, directional drilling: Directional drilling is carried out normally according to the directional drilling process to the designed inspection position. During normal directional drilling, water in the drill pipe flows through the throttle hole 12, the first flow hole 14, and the second flow hole 7, and passes through the directional hole gas content detection device where gas gushes out from the bottom of the hole. The resulting throttling pressure difference is insufficient to compress the large reset spring 9. During the entire normal drilling process, the directional hole gas content detection device based on the gas gushes out from the bottom of the hole is in an inoperative state. In this state, the first guide hole 4 and the second guide hole 13 are disconnected, and the piston 16 of the push rod 10 isolates the first gas channel 6 from the third gas channel 18, sealing the third gas channel 18 to prevent water from entering the air chamber 19.

[0034] S3, while drilling measurement: stop drilling and continue to inject water to drain the slag until the drill cuttings are completely drained from the bottom of the hole, increase the flow rate of the pump outside the hole to above the normal operating flow rate, and set the upper limit pressure of the pump to value A; when the water flow in the drill pipe increases, the throttling pressure difference generated by the water flow through the throttling hole 12 will compress the reset spring 9 to a certain stroke, and the first flow hole 14 of the throttling thrust push rod 8 near the end of the temperature and pressure test mechanism will slide into the annular sliding groove provided between the temperature and pressure test mechanism housing 17 and the push rod 10, thereby cutting off the water flow inside the drill pipe, causing the pressure of the pump outside the hole to increase; the increased water pressure acts on the throttling thrust push rod 8 to push the reset spring 9 to its full stroke, and at the same time, the throttling thrust push rod 8 pushes the temperature and pressure test piston 16, The small reset spring 11 is compressed. At this point, the first guide hole 4 and the second guide hole 13 are aligned and connected, and the first gas channel 6, the second gas channel 15, and the third gas channel 18 are connected. The upper limit pressure of the pump is set to value B (B>A). The water inside the drill pipe enters the space between the device housing 1 and the rubber sleeve mechanism through the first guide hole 4 and the second guide hole 13, causing the rubber sleeve to expand, thereby sealing the annular space between the drill hole and the device external clamp, forming a closed space from the rubber sleeve to the bottom of the drill hole. The gas in the closed space flows into the air chamber 19 through the first gas channel 6, the second gas channel 15, and the third gas channel 18. The gas outflow parameters in the air chamber 19 are collected by the tester 20 and stored in the temperature and pressure tester 20.

[0035] S4, continue drilling: After the measurement of one measuring point is completed, the pressure of the outer hole pump is removed, the large reset spring 9 resets the throttling thrust rod 8, and the small reset spring 11 resets the temperature and pressure test piston 16; the outer hole pump is adjusted to the normal drilling working state, and the drilling construction is continued according to the directional drilling construction process;

[0036] S5, multi-point measurement: when the drilling is re-constructed to the designed detection position, repeat S3 and S4 to achieve multi-point continuous measurement;

[0037] S6, after the entire drilling construction is completed, the drilling tool is withdrawn and the measuring device is disassembled, the measured data is read from the tester 20, and the coal seam gas content is calculated based on the bottom hole gas emission parameters to complete the measurement work.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions, which should all be included in the scope of the claims of the present invention.

Claims

1. A directional hole gas content detection device based on hole bottom gas outburst, characterized by: The device comprises a housing, a rubber cylinder mechanism, an actuating mechanism, and a temperature and pressure testing mechanism. The housing is a hollow cylindrical structure provided with an upper joint and a lower joint. The rubber cylinder mechanism is mounted on the outer side of the housing near the upper joint. The actuating mechanism is limited by the housing to a hollow portion of the housing and can only move axially along the housing. The temperature and pressure testing mechanism comprises a housing, an air chamber, and a tester. The housing is fixed to the interior of the housing near the lower joint. The water channel is closed by throttling the pressure difference, and the water pressure control mechanism is actuated to expand the rubber cylinder and seal the bottom of the borehole. The temperature and pressure testing mechanism detects gas outburst parameters in the enclosed space at the bottom of the hole. The rubber cylinder mechanism includes a sliding sleeve, two rubber cylinder fixing blocks, a rubber cylinder, a pressure relief joint and a rubber cylinder core shaft. The rubber cylinder is fixed to the outer wall of the rubber cylinder core shaft through the sliding sleeve and the rubber cylinder fixing block. The pressure relief joint is connected to the rubber cylinder core shaft and the rubber cylinder fixing block. The device shell is provided with a first guide hole, a pressure relief hole, a first gas channel and a second flow hole. The action mechanism includes a throttling thrust push rod, a large reset spring, a push rod and a small reset spring. The throttling thrust push rod is provided with a throttling hole and a second guide hole near the upper joint end, and a first flow hole near the push rod end. The large reset spring is installed on the outside of the throttling push rod. The throttling push rod and the device housing work together to achieve limiting; the push rod is installed on the outside of the throttling thrust push rod end near the temperature and pressure test mechanism, and moves axially along the device housing between the device housing and the temperature and pressure test mechanism; the push rod is provided with a second gas channel, and a piston is provided at the lower joint end of the push rod, and a small reset spring is installed on the outside of the temperature and pressure test mechanism, and limiting is achieved by the joint action of the push rod and the temperature and pressure test mechanism housing; the temperature and pressure test mechanism housing is provided with a third gas channel, and an air chamber connected to the third gas channel and a tester installation slot are provided inside, and the tester is installed in the tester installation slot.

2. The device for detecting gas content in a directional hole based on bottom hole gas outburst according to claim 1, characterized in that: A temperature sensor and a pressure sensor are provided near the air chamber end of the tester to collect the temperature and air pressure in the air chamber.

3. A method for detecting gas content in a directional hole based on bottom hole gas outflow, using a device for detecting gas content in a directional hole based on bottom hole gas outflow as claimed in any one of claims 1 or 2, characterized in that: The following steps are involved: S1, installation preparation: Assemble the housing, rubber cylinder mechanism, action mechanism, temperature and pressure test mechanism and other components in sequence, and install them between the bottom hole motor and the lower non-magnetic drill rod, with the lower joint installed close to the bottom hole motor; S2, directional drilling: Construction is carried out normally to the designed inspection position according to the directional drilling construction process. During normal directional drilling, water in the drill pipe flows through the throttling hole, the first flow hole, and the second flow hole, and passes through the directional hole gas content detection device based on the gas outflow at the bottom of the hole. The throttling pressure difference generated is insufficient to drive the compression of the large reset spring. During the entire normal drilling process, the directional hole gas content detection device based on the gas outflow at the bottom of the hole is in an inoperative state. When the directional hole gas content detection device is in an inoperative state, the first guide hole and the second guide hole are not connected. The push rod piston isolates the first gas channel from the third gas channel and seals the third gas channel to prevent water from entering the gas chamber. S3, while drilling measurement: stop drilling and continue to inject water to remove slag until the drill cuttings are completely removed from the bottom of the hole, increase the flow rate of the pump outside the hole to above the normal working flow rate, and set the upper limit pressure of the pump to value A; when the water flow in the drill pipe increases, the throttling pressure difference generated by the water flow through the throttling hole will compress the reset spring to a certain stroke, and the first flow hole near the end of the throttling thrust push rod near the temperature and pressure test mechanism will slide into the annular sliding groove set between the shell of the temperature and pressure test mechanism and the push rod, thereby cutting off the water flow inside the drill pipe, causing the pressure of the pump outside the hole to increase; the increased water pressure acts on the throttling thrust push rod to push the reset spring to full stroke, and at the same time, the throttling thrust push rod The temperature and pressure test piston is pushed in, and the small reset spring is compressed. At this time, the first guide hole and the second guide hole are aligned and connected, and the first gas channel, the second gas channel, and the third gas channel are connected. The upper limit pressure of the pump is set to value B. The water inside the drill pipe enters the space between the device housing and the rubber cylinder mechanism through the first guide hole and the second guide hole, causing the rubber cylinder to expand, thereby sealing the annular space between the drill hole and the device outer clamp, forming a closed space from the rubber cylinder to the bottom of the drill hole. The gas in the closed space flows into the air chamber through the first gas channel, the second gas channel, and the third gas channel. The tester collects the gas outflow parameters in the air chamber and stores them in the temperature and pressure tester. S4, continue drilling: After the measurement of a measuring point is completed, the pressure of the external hole pump is removed, the large reset spring resets the throttling thrust rod, and the small reset spring resets the temperature and pressure test piston; the external hole pump is adjusted to the normal drilling working state, and the drilling construction is continued according to the directional drilling construction process; S5, multi-point measurement: when the drilling is re-constructed to the designed detection position, repeat S3 and S4 to achieve multi-point continuous measurement; S6. After the entire drilling construction is completed, the drilling tool is withdrawn and the detection device is disassembled. The measurement data is read from the tester, and the coal seam gas content is calculated based on the bottom hole gas emission parameters to complete the measurement work.

4. The method for detecting gas content in a directional hole based on bottom hole gas emission according to claim 3, characterized in that: Set the pump upper limit pressure B value to be greater than A value.

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