CN114441216A - Dry-type closed sampling method for underground deep hole of coal mine - Google Patents
Dry-type closed sampling method for underground deep hole of coal mine Download PDFInfo
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- CN114441216A CN114441216A CN202111577531.3A CN202111577531A CN114441216A CN 114441216 A CN114441216 A CN 114441216A CN 202111577531 A CN202111577531 A CN 202111577531A CN 114441216 A CN114441216 A CN 114441216A
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- 238000005070 sampling Methods 0.000 title claims abstract description 158
- 239000003245 coal Substances 0.000 title claims abstract description 90
- 238000000034 method Methods 0.000 title claims abstract description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 58
- 238000003825 pressing Methods 0.000 claims abstract description 21
- 238000005553 drilling Methods 0.000 claims abstract description 18
- 238000012360 testing method Methods 0.000 claims abstract description 8
- 238000007789 sealing Methods 0.000 claims description 58
- 238000003795 desorption Methods 0.000 claims description 40
- 230000000903 blocking effect Effects 0.000 claims description 13
- 238000012806 monitoring device Methods 0.000 claims description 13
- 230000009471 action Effects 0.000 claims description 9
- 238000004891 communication Methods 0.000 claims description 8
- 230000000630 rising effect Effects 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 5
- 230000000149 penetrating effect Effects 0.000 claims description 4
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 238000005507 spraying Methods 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 6
- 239000012530 fluid Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000004047 hole gas Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/04—Devices for withdrawing samples in the solid state, e.g. by cutting
- G01N1/08—Devices for withdrawing samples in the solid state, e.g. by cutting involving an extracting tool, e.g. core bit
Abstract
The invention discloses a coal mine underground deep hole dry-type closed sampling method which is realized by a coal mine underground deep hole dry-type closed sampling system and comprises the following steps: step 1, installing a non-coring bit to drill to a coring target hole depth; step 2, lifting the drill, and replacing a non-coring drill bit with a dry coal sample sampling device qualified in pressure test; step 3, conveying the dry coal sample sampling device to a preset coring point from an orifice; step 4, starting compressed air drilling or hydraulic drilling until the pressure value in the dry coal sample sampling device continuously and stably rises and is converted into sudden drop; and 5, sequentially withdrawing all drilling tools in the hole and taking out the coal sample. According to the method, the medium used for sampling drilling and pressurizing closing is changed by matching the air pressing device and the high-pressure water supply equipment, the problem of coal sample moisture distortion caused by the fact that a dry coal sample cannot be collected in the prior art is solved, and the problems of spraying holes, hole collapse and the like possibly existing in sampling in a coal bed are effectively avoided.
Description
Technical Field
The invention belongs to the technical field of geological exploration and coal mine safety, and relates to a coal mine underground deep hole dry-type closed sampling system and method.
Background
The gas content is a basic parameter in the aspects of mine gas disaster prediction and prevention, gas resource evaluation and development and the like. With the rapid development of technologies such as mine excavation and drilling and the increasing demand of mine energy extraction and efficiency improvement, the technical demand of deep hole coal bed gas content measurement is more and more urgent. The standard of the underground direct measurement method for the coal bed gas content is as follows: the actual time taken for the coal sample to be subjected to gas content measurement to be exposed to the coal sample tank and sealed should not exceed 5 min. In the actual production of coal mines, the sampling time of coal samples with deep-hole gas content is far longer than 5min, the gas content measurement result is often greatly different from the actual value, and misjudgment is caused for the safety production of coal mines and the exploration and development of gas resources.
In order to solve the problems, the technology for measuring the long-distance airtight sampling gas content of the coal mine underground coal seam is applied in the coal seam mining area, and a good effect is obtained, but because the technology carries out sampling and pressing on the airtight coal sample through water pressing, the dry coal sample cannot be collected, and the technology is limited in application of the broken soft high-gas coal seam, and because the broken soft high-gas coal seam is easy to have spray holes or collapse when meeting water, the technology cannot adopt clean water to carry out airtight sampling drilling and close the hole bottom of the coal sample. Therefore, a dry-type airtight sampling technology for a deep hole in a coal mine is urgently needed to meet the requirement of detecting gas occurrence information in a long distance and a large area in a coal seam, and guarantee safe and efficient production of a mine.
Disclosure of Invention
Aiming at the defects and shortcomings in the prior art, the invention provides a dry-type closed sampling method for a deep hole in a coal mine, and aims to solve the technical problem that in the prior art, a dry coal sample cannot be acquired by the deep hole in the coal mine.
In order to achieve the purpose, the invention adopts the following technical scheme:
a coal mine underground deep hole dry-type closed sampling method is realized by a coal mine underground deep hole dry-type closed sampling system and comprises the following steps:
step 4, starting compressed air drilling or compressed air combined hydraulic drilling until the pressure value in the dry coal sample sampling device continuously and stably rises and is converted into sudden drop;
and 5, sequentially withdrawing all drilling tools in the hole and taking out the coal sample.
The invention also has the following technical characteristics:
the coal mine underground deep hole dry-type closed sampling system comprises a compressed air device and a high-pressure water supply device which are arranged under a coal mine, wherein the compressed air device and the high-pressure water supply device are respectively connected with two inlet ends of a three-way converter, the outlet end of the three-way converter is communicated with the inlet end of a drill rod arranged in a drill hole through water, and the outlet end of the drill rod is connected with a sampling device;
the three-way converter is used for realizing the switching between the air compressing device and the high-pressure water supply equipment, so that the sampling device for completing sampling is sealed under the pressure action of the compressed air sent by the air compressing device, or the sampling device for completing sampling is sealed under the common pressure action of the compressed air sent by the air compressing device and the high-pressure water sent by the high-pressure water supply equipment.
Furthermore, the sampling device comprises a sampling outer cylinder, and a sampling drill bit and an upper joint which are coaxial with the sampling outer cylinder and are detachably and fixedly communicated are respectively arranged at two ends of the sampling outer cylinder;
the lower end of the upper joint extends into the sampling outer cylinder, the tail end of the upper joint is sequentially and coaxially communicated with a connecting sleeve and a pressing ball seat, and the lower end of the pressing ball seat is provided with a sampling inner cylinder and a sampling inner cylinder extension section; the pressing ball seat comprises a ball seat body, and an inner cavity with an open head end and an open tail end is arranged in the ball seat body;
a pushing cylinder is coaxially sleeved outside the connecting sleeve and the sampling inner cylinder; a desorption valve is arranged in the inner cavity and connected with the sampling inner cylinder; a sealing ball valve is arranged at one end, close to the sampling drill bit, in the sampling inner cylinder;
the high-pressure gas sent into the inner cavity by the compressed air device or the high-pressure water sent into the inner cavity by the high-pressure water supply equipment can pass through the overflowing hole arranged on the connecting sleeve and then push the hydraulic pushing head to axially move to close the sealing ball valve and the desorption valve.
Furthermore, the inner cavity comprises a first cavity, a second cavity and a third cavity which are sequentially communicated from top to bottom, and the inner side surface of the second cavity forms a limiting surface.
Furthermore, the sampling device also comprises a blocking ball, and the blocking ball can be connected with the limiting surface to form an annular sealing strip.
Furthermore, the hydraulic pushing head is limited by a power pin penetrating into the outer wall of the connecting sleeve.
Furthermore, the hydraulic pushing head is connected with the pushing cylinder through a fixing pin arranged at the tail end in a penetrating mode.
Furthermore, a desorption valve knob is arranged at the top end of the desorption valve and penetrates through a first through hole formed in the pressing ball seat body;
the sealing ball valve is arranged in a valve seat, the valve seat is embedded in the sampling inner cylinder, a sealing ball valve knob is arranged on the sealing ball valve, the sealing ball valve knob penetrates out of the valve seat through a window formed in the valve seat, and the window is communicated with a guide groove formed in the axial direction of the sampling inner cylinder; in the process that the pushing cylinder moves along the axial direction, the pushing block arranged on the inner wall of the pushing cylinder can push the desorption valve knob to rotate so as to close the desorption valve, and the pushing sheet arranged at the tail end of the pushing cylinder can slide along the guide groove so as to push the sealing ball valve knob to rotate so as to close the sealing ball valve.
Furthermore, the three-way converter comprises a three-way converter body, wherein a first interface end, a second interface end and a third interface end which are communicated are arranged on the three-way converter body, the first interface end is connected with the drill rod through a first communication pipe, the second interface end is communicated with the compressed air device through a high-pressure air pipe, the third interface end is communicated with the high-pressure water supply equipment through a high-pressure water pipe, a blocking ball feeding port is further formed in the outer wall of the converter body close to the first interface end, and a pressure monitoring device is arranged on the first communication pipe.
Further, the step 4 specifically includes: putting the plugging ball into the drill rod through the plugging ball putting port, starting the air pressing device to send high-pressure gas into the drill rod, sending the plugging ball into the inner cavity under the action of the high-pressure gas, continuously sending the high-pressure gas to carry out pressurization, and enabling the high-pressure gas to enter a sealed cavity formed by the sampling outer barrel, the bearing group, the connecting sleeve and the hydraulic pushing head through the flow hole;
if the pressure value monitored by the pressure monitoring device is kept continuously and stably within the preset time, switching the air compressing device and the high-pressure water supply equipment after the preset time is reached, sending high-pressure water for secondary pressurizing, and judging that the power pin is sheared and the sealing ball valve and the desorption valve are closed when the pressure value monitored by the pressure monitoring device is converted from continuous and stable rising to sudden falling;
if the pressure value monitored by the pressure monitoring device is changed from continuously and stably rising to suddenly falling within the preset time, the switching between the air compression device and the high-pressure water supply equipment is not required; and continuously pressing high-pressure gas until the sealing ball valve and the desorption valve are closed.
Compared with the prior art, the invention has the beneficial technical effects that:
(1) according to the method, through the change of the medium used for sampling drilling and pressurizing closing, the problem of coal sample moisture distortion caused by the fact that a dry coal sample cannot be collected in the prior art is solved, the problems of spraying holes, hole collapse and the like possibly existing in sampling in a coal bed can be effectively avoided, in-situ gas occurrence, gas-preserving and water-preserving coal sample sampling of the original water content can be achieved, and the measured values of the gas content, the water content and the like are more real and accurate.
(2) After the coring is completed, the desorption valves and the sealing ball valves at the two ends of the sampling inner cylinder can be closed in a linkage manner by means of gas pressure or water pressure, so that the sampling inner cylinder is sealed, the exposure time of the coal sample can be shortened to the maximum extent, and the gas loss and pollution of the coal sample or the rock sample are reduced.
(3) When the sampling outer cylinder drives the sampling drill bit to rotate, the sampling inner cylinder and the pushing cylinder do not rotate, so that the coal core damage caused by the rotation of the sampling inner cylinder is effectively avoided, and the sampling quality is improved. The method has simple operation process, saves time and labor during construction and is worth popularizing.
Drawings
FIG. 1 is a flow chart of the method of the present invention;
FIG. 2 is a schematic diagram of the overall structure of the sampling system;
FIG. 3 is a schematic structural diagram of a sampling device;
FIG. 4 is a partial schematic view of a sampling device;
FIG. 5 is a schematic view of a sealed ball valve;
FIG. 6 is a schematic diagram of the fluid flow direction in the sampling device, wherein the arrows in the diagram represent the fluid flow direction (a) before the plugging ball is inserted, (b) after the plugging ball is inserted and before the power pin is sheared, and (c) after the power pin is sheared.
The reference numerals in the figures denote:
1-a compressed air device, 2-a high-pressure water supply device, 3-a three-way converter, 4-water excrement, 5-a drill rod, 6-a sampling device, 7-a power pin, 8-a valve seat, 9-a bearing group, 10-a first communicating pipe, 11-a high-pressure air pipe, 12-a high-pressure water pipe, 13-a pressure monitoring device and 14-a blocking ball; 31-a first interface end, 32-a second interface end, 33-a third interface end, 61-a sampling outer cylinder, 62-a sampling drill bit, 63-an upper joint, 64-a connecting sleeve, 65-a pressing ball seat, 66-a sampling inner cylinder, 67-a sampling inner cylinder extension section, 68-a pushing cylinder and 69-a desorption valve; 81-window; 311-blocking the ball feeding port; 610-sealing ball valve, 611-hydraulic pushing head, 612-fixing pin; 641-overflowing hole, 651-ball seat body; 6511-first via; 661-guide groove, 681-push block, 682-push sheet, 691-desorption valve knob; 6101-sealing the ball valve knob; 652-inner cavity; 6521-first cavity, 6522-second cavity, 6523-third cavity, and A-spacing surface.
The invention is described in detail below with reference to the drawings and the detailed description.
Detailed Description
The present invention is not limited to the following embodiments, and all equivalent changes based on the technical solutions of the present invention fall within the protection scope of the present invention. The present invention will be described in further detail with reference to examples.
In describing the invention in terms of orientation, the terms "upper", "lower", "front", "rear", "left", "right", and the like, indicate an orientation or positional relationship merely to facilitate the description of the invention and to simplify the description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. Unless stated to the contrary, the terms "mounted," "connected," "fixed," and the like are to be construed broadly and may include, for example, a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
All parts in the present invention are those known in the art, unless otherwise specified.
Example 1:
the target mine of this embodiment is a certain colliery in Huainan, need implement along the coal seam deep hole, carries out the airtight sample of dry-type, and the sample is used for testing the original moisture content in coal seam and gas content.
As shown in fig. 1, following the above technical solution, the present embodiment discloses a method for dry-type closed sampling of a deep hole in a coal mine, which is implemented by a system for dry-type closed sampling of a deep hole in a coal mine.
The method comprises the following steps:
step 4, starting compressed air drilling or compressed air combined hydraulic drilling until the pressure value in the dry coal sample sampling device continuously and stably rises and is converted into sudden drop;
the method specifically comprises the following steps:
step 4, putting the plugging ball 14 into the drill rod 5 through the plugging ball putting port 311, starting the compressed air device 1 to send high-pressure gas into the drill rod 5, sending the plugging ball 14 into the inner cavity 652 under the action of the high-pressure gas, continuously sending the high-pressure gas to carry out pressurization, and sending the high-pressure gas into a sealed cavity defined by the sampling outer cylinder 61, the bearing group 9, the connecting sleeve 64 and the hydraulic pushing head 611 through the flow hole;
if the pressure value monitored by the pressure monitoring device 13 is kept continuously and stably within the preset time, switching the air compressing device 1 and the high-pressure water supply equipment 2 after the preset time is reached, sending high-pressure water for secondary pressurization, and judging that the power pin 8 is sheared, and closing the sealing ball valve 610 and the desorption valve 69 when the pressure value monitored by the pressure monitoring device 13 is changed from continuously and stably rising to suddenly falling;
if the pressure value monitored by the pressure monitoring device 13 is changed from continuously and stably rising to suddenly falling within the preset time, the switching between the air compressing device 1 and the high-pressure water supply equipment 2 is not required; continuing to pressurize the pressurized gas until the sealing ball valve 610 and the desorption valve 69 are closed;
and 5, sequentially withdrawing all drilling tools in the hole, and taking out the sampling inner cylinder 66.
As a preferred scheme of this embodiment, as shown in fig. 2, the coal mine underground deep hole dry-type closed sampling system includes an air compressing device 1 and a high-pressure water supply device 2 arranged in the coal mine underground, the air compressing device 1 and the high-pressure water supply device 2 are respectively connected to an inlet end of a three-way converter 3, an outlet end of the three-way converter 3 is further communicated with a drill rod 5 arranged in a drill hole through a water pipe 4, and the drill rod 5 is further connected with a sampling device 6; the air compression device 1 used in the embodiment is an air compressor, the air compressor is connected with an underground air supply pipeline, the high-pressure water supply equipment 2 is a slurry high-pressure pump, and the slurry high-pressure pump is connected with an underground water supply pipeline.
The three-way converter 3 is used for switching the air compressing device 1 and the high-pressure water supply equipment 2, so that the sampling device 6 which completes sampling is sealed under the pressure action of the compressed air fed by the air compressing device 1, or the sampling device 6 which completes sampling is sealed under the common pressure action of the compressed air fed by the air compressing device 1 and the high-pressure water fed by the high-pressure water supply equipment 2.
As a preferable scheme of the present embodiment, as shown in fig. 3 to 5, the sampling device 6 includes a sampling outer cylinder 61, and a sampling drill 62 and an upper joint 63 which are coaxial with and detachably and fixedly communicated with the sampling outer cylinder 61 are respectively provided at two ends of the sampling outer cylinder 61;
the lower end of the upper joint 63 extends into the sampling outer cylinder 61, the tail end of the upper joint 63 is sequentially and coaxially communicated with a connecting sleeve 64 and a pressing ball seat 65, and the lower end of the pressing ball seat is provided with a sampling inner cylinder 66 and a sampling inner cylinder extension section 67; the pressing ball seat 65 comprises a ball seat body 651, and an inner cavity 652 with an open head end and an open tail end is arranged in the ball seat body 651; the connecting sleeve 64 is used for realizing the lap joint of the sampling inner cylinder 66 and the upper joint 63, and can play a role in righting the sampling inner cylinder 66.
A pushing cylinder 68 is coaxially sleeved outside the connecting sleeve 64 and the sampling inner cylinder 66; a desorption valve 69 is arranged in the inner cavity 652, and the desorption valve 69 is connected with the sampling inner cylinder 66; a sealing ball valve 610 is arranged at one end of the sampling inner cylinder 66 close to the sampling drill bit 62; the outer wall of the connecting sleeve 64 is sleeved with a hydraulic pushing head 611;
because the existence of the connecting sleeve 64 can ensure that the sampling inner cylinder 66 and the pushing cylinder 68 which are respectively and fixedly connected with the connecting sleeve 64 can only slide along the axial direction, and the sampling inner cylinder extension section 37 can enter the inner cavity of the sampling drill bit 62 in the descending process of the sampling inner cylinder 6 and the pushing cylinder 68, so that the coal sample can enter the sampling inner cylinder 66.
The high pressure gas fed into the inner cavity by the compressed air device 1 or the high pressure water fed into the inner cavity by the high pressure water supply device 2 can push the hydraulic pushing head 611 to axially move to close the sealing ball valve 610 and the desorption valve 69 after the overflowing hole 641 arranged on the connecting sleeve 64.
The desorption valve 69 is kept in an open state in the sampling drilling process, when the coal core enters the sampling inner cylinder 66, water and impurities possibly existing in the sampling inner cylinder 66 can be extruded by the coal core and can be discharged through an inner hole of the desorption valve 69, so that the coal core sampling rate can be improved, and a relatively dry coal sample can be obtained; the desorption valve 69 can also be used as a test interface of the sampling inner cylinder 66, and after the sampling inner cylinder 66 is extracted from the device after sampling is finished, the desorption valve 69 can be directly connected with a test instrument, and then desorption test is carried out. When the sealing ball valve 610 is opened, a coal core obtained by sampling can enter the sampling inner cylinder 66 through the sealing ball valve 610, and when the sealing ball valve 610 is closed, the sealing ball valve 610 plays a role in sealing the coal core and preventing gas loss caused by desorption of the coal core, and in addition, the sealing ball valve 610 also plays a role in cutting off the coal core.
As a preferable solution of this embodiment, the inner cavity 652 includes a first cavity 6521, a second cavity 6522 and a third cavity 6523 that are sequentially communicated from top to bottom, and an inner side surface of the second cavity 6522 forms a limiting surface a.
As a preferable solution of this embodiment, the sampling device further includes a blocking ball 14, and after the blocking ball 14 enters the second cavity 6522 from the drill rod 5, since the diameter of the blocking ball is larger than that of the small-diameter end of the second cavity, the blocking ball 14 can be connected with the stop surface a to form an annular sealing strip.
As a preferable scheme of this embodiment, the hydraulic pushing head 611 is limited by a power pin 7 penetrating the outer wall of the connecting sleeve 64.
A gap is formed between the inner surface of the hydraulic pushing head 611 and the outer surface of the connecting sleeve 64, and a gap is also formed between the outer surface of the hydraulic pushing head 611 and the inner wall of the sampling outer cylinder 61, so that an inner sealing ring is arranged between the hydraulic pushing head 611 and the connecting sleeve 64, and an outer sealing ring is arranged between the hydraulic pushing head 611 and the sampling outer cylinder 61. The inner sealing ring and the outer sealing ring are used for filling the gap, so that after the blocking ball 14 is thrown into the inner cavity 652, gas or liquid flowing out of the overflowing hole 641 flows through the gap, and a sealing cavity cannot be formed among the sampling outer cylinder 61, the bearing set 9, the connecting sleeve 64 and the hydraulic pushing head 611.
The gas flow direction before the plugging ball is put in is shown in fig. 6(a), the gas flow direction before the power pin 612 is sheared after the plugging ball is put in is shown in fig. 6(b), after the power pin 612 is sheared, the hydraulic pushing head 611 moves downwards, the gap between the inner sealing ring 24 and the outer wall of the connecting sleeve is enlarged due to the reduction of the outer diameter of the lower end of the connecting sleeve, and as shown in fig. 6(c), high-pressure fluid leaks out from the gap, enters the sampling drill bit 62 along the annular gap between the sampling inner cylinder 66 and the sampling outer cylinder 61, and is discharged from the drill bit overflowing hole 14 on the sampling drill bit 62, so that the system pressure is suddenly reduced.
As a preferable solution of this embodiment, the hydraulic pushing head 611 is connected to the pushing cylinder 68 through a fixing pin 612.
A desorption valve knob 691 is arranged at the top end of the desorption valve 69, and the desorption valve knob 691 penetrates into a first through hole 6511 formed in the pressing ball seat body 651;
the sealing ball valve 610 is arranged in a valve seat 8, the valve seat 8 is embedded in the sampling inner cylinder 66, a sealing ball valve knob 6101 is arranged on the sealing ball valve 610, the sealing ball valve knob 6101 penetrates out of the valve seat through a window 81 arranged on the valve seat 8, and the window 81 is communicated with a guide groove 661 arranged along the axial direction of the sampling inner cylinder 66; during the axial movement of the push cylinder 68, the push block 681 disposed on the inner wall of the push cylinder 68 can push the desorption valve knob 691 to rotate to close the desorption valve 69, and the push tab 682 disposed at the rear end of the push cylinder 68 can slide along the guide groove 661 to push the sealing ball valve knob 6101 to rotate to close the sealing ball valve 610. The valve seat 8 is used for fixing the sealing ball valve 610, one end of the valve seat 8 is connected with the cylinder body of the sampling inner cylinder 66 through threads, and the other end of the valve seat 8 is connected with the sampling inner cylinder extension section 67 through threads.
The first through hole 6511 and the guide groove 661 may be coaxially disposed or may not be coaxially disposed according to specific construction conditions.
As a preferable scheme of this embodiment, the lower end of the upper joint 63 is sleeved with a bearing set 9, and the bearing set 9 is in threaded connection with the connecting sleeve 64. The guide slot 661 also prevents the push tab 682 from shifting radially, preventing the push tab 682 from coming into loose or non-contact with the sealing ball valve knob 6101, thereby causing the sealing ball valve 610 to fail to close.
As a preferable scheme of this embodiment, the three-way converter 3 includes a three-way converter body, the three-way converter body is provided with a first interface end 31, a second interface end 32, and a third interface end 33, which are communicated with each other, the first interface end 31 is connected to the drill rod 5 through a first communication pipe 10, the second interface end 32 is communicated with the compressed air device 1 through a high-pressure air pipe 11, the third interface end 33 is communicated with the high-pressure water supply equipment 2 through a high-pressure water pipe 12, a blocking ball input port 311 is further provided on an outer wall of the converter body near the first interface end 31, and the first communication pipe 12 is provided with a pressure monitoring device 13. Valves are arranged on the first communication pipe 10, the high-pressure air pipe 11 and the high-pressure water pipe 12, and the connection or the disconnection of the first communication pipe 10, the high-pressure air pipe 11 and the high-pressure water pipe 12 can be controlled through the valves.
The coal mine underground deep hole dry-type closed sampling system is used as follows:
the desorption valve 69 and the sealing ball valve 610 are kept in an open state before being pressed, the plugging ball 14 is put into the drill rod 5 and starts to be pressed by the compressed air device 1 or the high-pressure water supply device 2, the plugging ball 14 is sent into the pressing ball seat 65 to form an annular sealing strip, the high-pressure fluid entering the inner cavity 652 flows into a sealing cavity formed by the end surfaces of the hydraulic pushing head 611, the connecting sleeve 64, the sampling outer cylinder 66 and the bearing group 9 through the flow hole 641, the high-pressure fluid is continuously pumped to increase the pressure in the closed sampling device 6, the fluid pressure mainly acts on the hydraulic pushing head 611 at the moment, when the pressure is increased to a certain degree, the power pin 612 is sheared, the hydraulic pushing head 611 pushes the pushing cylinder 68 to slide together, the pushing sheet 682 at the lower end of the pushing cylinder 68 can push the sealing ball valve 610 to rotate, the pushing block 981 can drive the desorption valve knob 691 to rotate, so that the sealing ball valve 610 and the desorption valve 69 are closed in a linkage manner, and sealing the coal rock sample in the sampling inner cylinder.
The method has passed field experiments, and the dry coal sample is collected by changing the medium used for closing the sampling drilling and the pressurizing, so that the problem of coal sample moisture distortion caused by the fact that the dry coal sample cannot be collected in the prior art is solved, the problems of spray holes, hole collapse and the like possibly existing in sampling in a coal bed can be effectively avoided, in-situ gas occurrence, gas preservation of original water content and water preservation coal sample sampling can be realized, and the measured values of the gas content, the water content and the like are more real and accurate.
Claims (10)
1. A coal mine underground deep hole dry-type closed sampling method is characterized by being realized through a coal mine underground deep hole dry-type closed sampling system and comprising the following steps of:
step 1, installing a non-coring bit to drill to a coring target hole depth;
step 2, lifting the drill, and replacing a non-coring drill bit with a dry coal sample sampling device qualified in pressure test;
step 3, conveying the dry coal sample sampling device to a preset coring point from an orifice;
step 4, starting compressed air drilling or compressed air combined hydraulic drilling until the pressure value in the dry coal sample sampling device continuously and stably rises and is converted into sudden drop;
and 5, sequentially withdrawing all drilling tools in the hole and taking out the coal sample.
2. The coal mine underground deep hole dry-type closed sampling method according to claim 1, characterized in that the coal mine underground deep hole dry-type closed sampling system comprises an air pressing device (1) and a high-pressure water supply device (2) which are arranged under a coal mine, the air pressing device (1) and the high-pressure water supply device (2) are respectively connected with two inlet ends of a three-way converter (3), the outlet end of the three-way converter (3) is communicated with the inlet end of a drill rod (5) arranged in a drill hole through a water pipe (4), and the outlet end of the drill rod (5) is connected with a sampling device (6);
the three-way converter (3) is used for switching the air compressing device (1) and the high-pressure water supply equipment (2), so that the sampling device (6) which completes sampling is closed under the pressure action of the compressed air sent by the air compressing device (1), or the sampling device (6) which completes sampling is closed under the common pressure action of the compressed air sent by the air compressing device (1) and the high-pressure water sent by the high-pressure water supply equipment (2).
3. The dry-type closed sampling method for the deep hole in the coal mine well according to the claim 1, characterized in that the sampling device (6) comprises a sampling outer cylinder (61), and a sampling drill bit (62) and an upper joint (63) which are coaxial with the sampling outer cylinder (61) and are detachably and fixedly communicated are respectively arranged at two ends of the sampling outer cylinder (61);
the lower end of the upper joint (63) extends into the sampling outer cylinder (61), the tail end of the upper joint (63) is sequentially and coaxially communicated with a connecting sleeve (64) and a pressurizing ball seat (65), and the lower end of the pressurizing ball seat (65) is provided with a sampling inner cylinder (66) and a sampling inner cylinder extension section (67); the pressing ball seat (65) comprises a ball seat body (651), and an inner cavity (652) with an open head end and an open tail end is arranged in the ball seat body (651);
a pushing cylinder (68) is coaxially sleeved outside the connecting sleeve (64) and the sampling inner cylinder (66); a desorption valve (69) is arranged in the inner cavity (652), and the desorption valve (69) is connected with the sampling inner cylinder (66); a sealing ball valve (610) is arranged at one end of the sampling inner cylinder (66) close to the sampling drill bit (62);
the outer wall of the connecting sleeve (64) is sleeved with a hydraulic pushing head (611);
high-pressure gas sent into the inner cavity by the compressed air device (1) or high-pressure water sent into the inner cavity by the high-pressure water supply equipment (2) can pass through the overflowing hole (641) formed in the connecting sleeve (64) and then push the hydraulic pushing head (611) to axially move to close the sealing ball valve (610) and the desorption valve (69).
4. The dry-type closed sampling method for the deep hole in the coal mine well according to claim 3, wherein the inner cavity (652) comprises a first cavity (6521), a second cavity (6522) and a third cavity (6523) which are sequentially communicated from top to bottom, and a limiting surface (A) is formed on the inner side surface of the second cavity (6522).
5. The coal mine underground deep hole dry-type closed sampling method as defined in claim 4, characterized in that the sampling device further comprises a blocking ball (14), and the blocking ball (14) can be connected with the limiting surface (A) to form an annular sealing strip.
6. The coal mine underground deep hole dry-type closed sampling method as claimed in claim 3, characterized in that the hydraulic pushing head (611) is limited by a power pin (7) penetrating through the outer wall of the connecting sleeve (64).
7. The coal mine underground deep hole dry type closed sampling method as defined in claim 3, wherein the hydraulic pushing head (611) is connected with the pushing cylinder (68) through a fixed pin (612), and the outer walls of the upper joint (63) and the connecting sleeve (64) are also sleeved with a bearing set (9).
8. The dry-type closed sampling method for the deep hole under the coal mine well according to the claim 3, characterized in that a desorption valve knob (691) is arranged at the top end of the desorption valve (69), and the desorption valve knob (691) penetrates into a first through hole (6511) formed in the pressing ball seat body (651);
the sealing ball valve (610) is arranged in a valve seat (8), the valve seat (8) is embedded in a sampling inner cylinder (66), a sealing ball valve knob (6101) is arranged on the sealing ball valve (610), the sealing ball valve knob (6101) penetrates out of the valve seat through a window (81) arranged on the valve seat (8), and the window (81) is communicated with a guide groove (661) axially arranged along the sampling inner cylinder (66); in the process that the pushing cylinder (68) moves along the axial direction, a pushing block (681) arranged on the inner wall of the pushing cylinder (68) can push the desorption valve knob (691) to rotate so as to close the desorption valve (69), and a pushing sheet (682) arranged at the tail end of the pushing cylinder (68) can slide along the guide groove (661), so that the sealing ball valve knob (6101) is pushed to rotate so as to close the sealing ball valve (610).
9. The coal mine underground deep hole dry-type closed sampling method as defined in claim 2, wherein the three-way converter (3) comprises a three-way converter body, a first interface end (31), a second interface end (32) and a third interface end (33) which are communicated are arranged on the three-way converter body, the first interface end (31) is connected with the drill rod (5) through a first communication pipe (10), the second interface end (32) is communicated with the compressed air device (1) through a high-pressure air pipe (11), the third interface end (33) is communicated with the high-pressure water supply equipment (2) through a high-pressure water pipe (12), a blocking ball feeding port (311) is further arranged on the outer wall of the converter body close to the first interface end (31), and a pressure monitoring device (13) is arranged on the first communication pipe (12).
10. The coal mine underground deep hole dry-type closed sampling method as claimed in claim 1, wherein the step 4 specifically comprises: putting a plugging ball (14) into a drill rod (5) from a plugging ball putting port (311), starting a compressed air device (1) to send high-pressure gas into the drill rod (5), sending the plugging ball (14) into an inner cavity (652) under the action of the high-pressure gas, continuously sending the high-pressure gas into the inner cavity to carry out pressurization, and sending the high-pressure gas into a sealing cavity defined by a sampling outer cylinder (61), a bearing group (9), a connecting sleeve (64) and a hydraulic pushing head (611) through a flow hole;
if the pressure value monitored by the pressure monitoring device (13) is kept continuously and stably within the preset time, switching between the air pressing device (1) and the high-pressure water supply equipment (2) is carried out after the preset time is reached, high-pressure water is fed for secondary pressing, and when the pressure value monitored by the pressure monitoring device (13) is changed from continuously and stably rising to suddenly falling, the power pin (8) is judged to be cut off, and the sealing ball valve (610) and the desorption valve (69) are closed;
if the pressure value monitored by the pressure monitoring device (13) is changed from continuous and stable rising to sudden falling within the preset time, the switching between the air compression device (1) and the high-pressure water supply equipment (2) is not required; the high pressure gas continues to be forced in until the sealing ball valve (610) and the desorption valve (69) are closed.
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