CN111042812A - Underground fixed-point sampling device and method - Google Patents
Underground fixed-point sampling device and method Download PDFInfo
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- CN111042812A CN111042812A CN202010034881.4A CN202010034881A CN111042812A CN 111042812 A CN111042812 A CN 111042812A CN 202010034881 A CN202010034881 A CN 202010034881A CN 111042812 A CN111042812 A CN 111042812A
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- 238000005070 sampling Methods 0.000 title claims abstract description 123
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000007789 sealing Methods 0.000 claims abstract description 48
- 238000005553 drilling Methods 0.000 claims abstract description 38
- 239000002775 capsule Substances 0.000 claims description 45
- 239000003245 coal Substances 0.000 claims description 24
- 238000000605 extraction Methods 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 229910000831 Steel Inorganic materials 0.000 claims description 10
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- 239000012530 fluid Substances 0.000 claims description 7
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- 239000003566 sealing material Substances 0.000 claims description 3
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
- E21B49/08—Obtaining fluid samples or testing fluids, in boreholes or wells
- E21B49/081—Obtaining fluid samples or testing fluids, in boreholes or wells with down-hole means for trapping a fluid sample
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
- E21B49/02—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells by mechanically taking samples of the soil
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
- E21B49/08—Obtaining fluid samples or testing fluids, in boreholes or wells
- E21B49/084—Obtaining fluid samples or testing fluids, in boreholes or wells with means for conveying samples through pipe to surface
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
Abstract
The invention relates to the technical field of downhole fixed-point sampling, in particular to a downhole fixed-point sampling device, wherein a double-wall drill rod comprises an inner-layer pipe and an outer-layer pipe which are sleeved, and a gas circulation gap is arranged between the inner layer pipe and the outer layer pipe, the first end of the inner layer pipe and the first end of the outer layer pipe are both connected on the sampling drill bit, and the position of the outer layer pipe close to the first end part is provided with a channel for communicating the gas circulation gap and the space in the drilled hole, the first end of the inner layer pipe is opened and leads the inside of the inner layer pipe to be communicated with the space in the drilled hole, the power end of the drilling machine is held on the pipe wall of the double-wall drill rod and can drive the sampling drill bit to rotate by the double-wall drill rod, the air tap is arranged at the second end of the outer layer pipe and seals the gas circulation gap at the second end of the outer layer pipe, and the air tap is provided with, the external port is communicated with a gas circulation gap to be used for sealing the gap between the outer layer pipe and the inner wall of the drill hole and providing rotary support for the double-wall drill rod. The invention also provides a corresponding underground fixed point sampling method.
Description
Technical Field
The invention relates to the technical field of underground fixed point sampling, in particular to an underground fixed point sampling device and method for a coal mine.
Background
The measurement of gas content needs fixed point sampling, and scientific research personnel at home and abroad have conducted extensive and deep research aiming at the fixed point sampling, and the current sampling means includes: the method comprises the steps of sampling coal samples by negative pressure injection, sampling by a twist drill rod and a core tube, and the like. The coal sample is in a negative pressure state by negative pressure injection, so that the desorption speed of the coal sample is influenced, the desorption rule of the coal sample is destroyed, and the sampling success rate is low under the influence of the negative pressure; the coal sampling of the twist drill rod is that the coal sampling is taken from the outer wall of the twist drill rod, the coal sampling flows from the inside to the outside, penetrates through the whole drill hole and is disturbed and influenced by the twist drill rod, and pulverized coal on the wall of the drill hole is possibly ground down, so that the detailed sampling place of the coal sampling is unclear, the sampling effect is influenced, and the sampling depth of the twist drill rod is shallow under the influence of the capacity of a drilling machine; the core tube sampling drilling process needs to be changed with a sampling drill bit, the procedure is complex, the sampling time is long, the desorption amount of the taken coal sample is small, and the measured gas content of the coal sample is small.
The detection of the position of the underground fire area is always a difficult problem, and the finding of the position of the fire area is targeted to take fire extinguishing measures, which is the key of underground fire extinguishing. At present, the direct detection means comprises pre-embedded temperature sensing elements and drilling detection. The embedded temperature sensing element has higher cost, and the goaf top plate can break the element. The distance of the drilling detection fire zone is longer, and the sampling difficulty is high.
The accurate collection of the goaf gas sample is the main basis for judging the change of gas indexes and the spontaneous combustion condition in the goaf. Because the gas in the goaf has poor mobility, the goaf mainly moves by the motion of gas molecules and diffusion effect. Currently, a negative pressure sampler and a vacuum pump are adopted for pumping. The air suction amount of the negative pressure sampler is small, and the position of the air to be sucked is uncertain. The vacuum pump also has the problem of small air extraction quantity. Therefore, the extracted gas sample can not necessarily reflect the real condition of the gas in the goaf, and is not beneficial to monitoring the natural ignition index gas of the goaf.
Disclosure of Invention
In order to solve the problems, the invention provides an underground fixed-point sampling device which is simultaneously suitable for sampling coal samples, rock samples, gas samples in fire zones and goafs and the like. The invention also provides a downhole fixed-point sampling method.
In order to achieve the purpose, the invention adopts the technical scheme that:
in a first technical scheme, the downhole fixed-point sampling device is used for sampling in a drill hole and comprises a double-wall drill rod, a sampling drill bit, a capsule with a bearing hole, a wind tap, a drilling machine and a sample collector, wherein the double-wall drill rod comprises an inner layer pipe and an outer layer pipe which are sleeved, a gas circulation gap is formed between the inner layer pipe and the outer layer pipe, a first end of the inner layer pipe and a first end of the outer layer pipe are both connected to the sampling drill bit, a channel for communicating the gas circulation gap with a space in the drill hole is arranged at a position, close to the first end, of the outer layer pipe, the first end of the inner layer pipe is open, the inner layer in the inner layer is communicated with the space in the drill hole, a power end of the drilling machine is held on the wall of the double-wall drill rod and can drive the sampling drill bit to rotate through the double-wall drill rod, the wind tap is arranged at a second end of, the air tap is provided with an external port which is communicated with the air circulation gap, the inner layer pipe penetrates through the air tap, and the sample collector is arranged at the outlet end of the air tap; the hole sealing capsule with the bearing is arranged at the inner section of the outer layer pipe, which is positioned in the drill hole, and is used for sealing the gap between the outer layer pipe and the inner wall of the drill hole and providing rotary support for the double-wall drill rod;
the pressure fluid can enter the drill hole through the external port and the gas circulation gap, and the sample to be sampled in the drill hole is led out to the sample collector from the inner layer pipe through the fluid pressure.
In the first technical solution, preferably, the hole sealing capsule with the bearing comprises a hole sealing capsule and a bearing, wherein an inner ring of the bearing is fixedly sleeved on an outer ring surface of the outer layer pipe, the hole sealing capsule is installed on an outer ring of the bearing, and the hole sealing capsule can radially expand to increase a radial area.
In the first technical solution, preferably, the sampling drill is provided with an ejector. .
In the first aspect, it is preferable that the sample collector is connected to a negative pressure supply device for supplying an internal negative pressure to the inner tube.
In the first technical scheme, preferably, the negative pressure providing device is an adjustable exhaust fan or an extraction high negative pressure pipeline.
In the first technical scheme, preferably, the air inlet of the negative pressure providing device is connected with the air outlet end of the inner pipe of the air tap through a steel wire framework rubber pipe, and the steel wire framework rubber pipe is provided with a sampling hole.
In the first technical means, it is preferable that the sample collection device is made of a transparent material and has a scale.
In a second aspect, a downhole fixed-point sampling method using the downhole fixed-point sampling device of any one of the first to third aspects, comprises
(1) The solid sample method was taken: the drilling machine drills to a sampling place, and the path through which the sample passes is cleaned by compressed air. Fixing a hole sealing capsule with a bearing on a drill rod, pushing the hole sealing capsule to a drill hole opening, and inflating the capsule to seal the drill hole; the drilling machine starts to drill, opens the compressed air and opens the negative pressure providing device, the sample cut by the drill bit reaches the sample collecting device through the inner pipe, when the sample reaches the collecting scale requirement, the compressed air is closed, the drilling is stopped and the negative pressure providing device is closed, and the solid sample is collected to the coal sample tank; deflating the hole sealing capsule with the bearing, separating the capsule wall from the drill hole orifice wall, starting a drilling machine to connect the drill rod outside the drill hole with a first connector, opening the first connector, detaching the hole sealing capsule with the bearing from the drill rod, and connecting the drill rod;
(2) adopting a method of sealing gas samples in the goaf: when sampling, firstly connecting an air inlet of the negative pressure providing device with a closed inner observation tube through a steel wire skeleton rubber tube, plugging a sampling hole with a rubber plug, starting the negative pressure providing device to perform air extraction, closing the negative pressure providing device after 3 minutes of air extraction, and opening the rubber plug of the sampling hole to take an air sample through a negative pressure sampler;
(3) adopting a fire area gas sample method: predicting the position of a fire area, driving a sampling drill bit and a double-wall drill rod to drill to the position of the preset fire area by using a drilling machine, plugging a drill hole opening by using rubber with a bearing after the drilling is stopped, sealing a hole between the bearing and the drill rod by using other sealing materials, closing a valve at the air inlet end of an air-water tap, opening an adjustable fan to extract a gas sample of the fire area, stopping a pump after 3 minutes, and taking the gas sample through a sampling port.
The beneficial effects of the invention are as follows:
1. this device utilizes the anti-circulation principle of compressed air and negative pressure suction to promote the circulation principle, makes the sample under the sample drill bit front end cuttings take out from double-walled drill rod center fast in succession, can realize the fixed point sample, need not change the drill bit moreover, and the sample is quick, sample quality is higher. The gas sample can rapidly reach the outside of the drill hole or the outside of the closed wall, and a reliable gas sample is obtained.
2. The hole sealing capsule with the bearing can fix and prevent capsule abrasion and air leakage caused by rotation of the double-wall drill rod in the sampling process.
3. The adjustable exhaust fan has the functions of speed regulation and pressure regulation, can promote the circulation of air flow in the double-wall drill rod, and can also utilize the adjustable exhaust fan 8 to suck part of samples when solid samples in the double-wall drill rod are accumulated to form blockage, so that the blocked part is dredged under the combined action of positive pressure and negative pressure.
4. In order to better observe the sample collection condition, the sample collection device can be made of transparent materials and marked with scales.
Drawings
FIG. 1 is a schematic structural diagram of a downhole fixed-point sampling device according to the present invention.
FIG. 2 is a schematic structural diagram of a downhole fixed-point sampling device according to the present invention for sampling gas.
FIG. 3 is a schematic view of a sealing capsule structure in the downhole fixed-point sampling device according to the present invention.
The reference numerals include:
1-sampling drill bit, 2-ejector, 3-double-wall drill rod, 4-hole sealing capsule with bearing, 5-air tap, 6-drilling machine, 7-sample collector, 8-negative pressure supply device, 9-valve, 10-drilling hole, 11-pressure gas, 12-drill rod holder, 13-air pressure air inlet direction, 14-air return direction, 15-coal powder or rock powder, 16-gas sampling port, 17-gauze, 18-sealing wall, 19-sampling point, 20-sampling hole, 21-steel wire skeleton rubber tube 41-hole sealing capsule, and 42-bearing.
Detailed Description
In order to make the purpose, technical solution and advantages of the present technical solution more clear, the present technical solution is further described in detail below with reference to specific embodiments. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present teachings.
Example 1
As shown in fig. 1-3, the downhole fixed-point sampling device proposed in this embodiment is used for sampling in a borehole 10, and comprises a double-wall drill rod 3, a sampling drill bit 1, a capsule 4 with a bearing hole, a pneumatic tap 5, a drilling machine 6 and a sample collector 7, wherein the double-wall drill rod 3 comprises an inner pipe and an outer pipe which are sleeved together, a gas circulation gap is formed between the inner pipe and the outer pipe, a first end of the inner pipe and a first end of the outer pipe are both connected to the sampling drill bit 1, a channel for communicating the gas circulation gap with the space in the borehole 10 is formed at a position of the outer pipe close to the first end, the first end of the inner pipe is open and enables the interior of the inner pipe to communicate with the space in the borehole 10, a power end of the drilling machine 6 is held on the wall of the double-wall drill rod 3 and can drive the sampling drill bit 1 to rotate through the double-wall drill rod 3, the pneumatic tap 5 is installed at a second end of the outer pipe and closes, the air tap 5 is provided with an external port which is communicated with the air circulation gap, the inner layer pipe is connected with the air tap 5, and the sample collector 7 is arranged at the outlet end of the air tap 5; the hole sealing capsule 4 with the bearing is arranged at the inner section of the outer layer pipe located in the drill hole 10, and the hole sealing capsule 4 with the bearing is used for sealing the gap between the outer layer pipe and the inner wall of the drill hole 10 and providing rotary support for the double-wall drill rod 3.
The pressure fluid can enter the borehole 10 through the external connection port and the gas circulation gap, and the sample to be sampled in the borehole 10 is led out to the sample collector 7 from the inner tube through the fluid pressure.
The hole sealing capsule 4 with the bearing comprises a hole sealing capsule 41 and a bearing 42, wherein the inner ring of the bearing 42 is fixedly sleeved on the outer ring surface of the outer layer pipe, the hole sealing capsule 41 is arranged on the outer ring of the bearing 42, and the hole sealing capsule 41 can radially expand to increase the radial area.
The ejector 2 is installed on the sampling drill bit 1, namely, the ejection hole is also formed in the drill bit.
The sample collector 7 is connected with a negative pressure supply device 8, and the negative pressure supply device 8 is used for supplying negative pressure to the inner layer pipe.
The negative pressure providing device 8 is an adjustable exhaust fan or an extraction high negative pressure pipeline.
The air inlet of the negative pressure providing device 8 is connected with the second end of the inner layer pipe through a steel wire framework rubber pipe 21, and a sampling hole 20 is arranged on the steel wire framework rubber pipe 21.
The sample collection device is made of transparent material and is provided with scales.
Example 2
A downhole fixed-point sampling method using the downhole fixed-point sampling device of example 1, comprising
(1) The solid sample method was taken: the drilling rig 6 drills to the sampling site and the path taken by the sample is cleaned by means of the pressurized gas 11. Fixing a hole sealing capsule 41 with a bearing 42 on a drill rod, pushing the capsule to the hole opening of the drill hole 10, and inflating the capsule to seal the drill hole 10; the drilling machine 6 starts to drill, pressure gas 11 is opened, the negative pressure providing device 8 is opened, a sample cut by the drill bit reaches the sample collecting device through the inner-layer pipe, when the sample meets the requirement of collecting scales, the pressure gas 11 is closed, the drilling is stopped, the negative pressure providing device 8 is closed, and the solid sample is collected to the coal sample tank; deflating the hole sealing capsule 41 with the bearing 42, starting the drilling machine 6 to connect the drill rod outside the drill hole 10 with a first joint and open after the capsule wall is separated from the hole opening wall of the drill hole 10, and connecting the drill rod after detaching the hole sealing capsule 41 with the bearing 42 from the drill rod;
(2) adopting a method of sealing gas samples in the goaf: when sampling, firstly connecting an air inlet of the negative pressure providing device 8 with the closed inner observation tube through the steel wire skeleton rubber tube 21, plugging the sampling hole 20 with a rubber plug, starting the negative pressure providing device 8 to perform air extraction, closing the negative pressure providing device 8 after 3 minutes of air extraction, and opening the rubber plug of the sampling hole 20 to take an air sample through the negative pressure sampler;
(3) adopting a fire area gas sample method: the position of a fire area is predicted, a sampling drill bit 1 and a double-wall drill rod 3 are driven by a drilling machine 6 to drill to the position of the preset fire area, after the drilling is stopped, an orifice of a drill hole 10 is sealed by rubber with a bearing 42, other sealing materials are used for sealing a gap between the bearing 42 and the drill rod, a valve 9 at the air inlet end of an air tap 5 is closed, an adjustable fan is opened at the moment to extract a gas sample of the fire area, after 3 minutes, a pump is stopped, and the gas sample is extracted through a gas sample extraction port 16.
Example 3
The present embodiment describes a downhole fixed-point sampling device and a corresponding sampling method in detail.
According to the invention, by utilizing the principle of reverse circulation of pressure gas 11, the pressure gas 11 enters an annular space between an inner pipe and an outer pipe of a double-wall drill rod 3 from a wind water faucet 5, when the pressure gas 11 reaches the bottom of a sampling drill bit 1, the pressure gas is divided into two paths, one path flows out from an air outlet of the sampling drill bit 1, the air current scours a sample cut by the sampling drill bit 1, so that the sample passes through a central hole of the sampling drill bit 1, a vortex barrier is formed at the bottom of the hole along with the rotation of the sampling drill bit 1, the barrier region is a high-pressure region, the interior of the barrier region is; the other path of air current reaches the bottom of the sampling drill bit 1 and is reflected back to flow out of the injection hole of the injector 2, the effect of guiding the air current to flow away from the inner-layer pipe of the double-wall drill rod 3 and take away a sample is achieved, meanwhile, the adjustable exhaust fan connected with the inner-layer pipe of the double-wall drill rod 3 is opened, two paths of air currents before negative pressure guiding are formed inside the double-wall drill rod, the flow of the inner-layer pipe of the double-wall drill rod 3 is increased, and the pressure is increased. During sampling, the drill rod holder 12 is opened, and a sealing capsule 41 with a bearing 42 is fitted on the double-walled drill rod 3 and the hole is sealed. Therefore, the pressure gas 11 carrying the pulverized coal can be prevented from flowing out of the hole from the space between the double-wall drill rod 3 and the hole wall, the air flow and the pressure of the inner-layer pipe of the double-wall drill rod 3 are increased, and the sampling rate and the sampling effect are improved. Under the action of triple wind force, samples at any fixed point flow out of the drill hole 10 from the bottom of the drill hole 10 along with wind flow from the inner layer pipe of the double-wall drill rod 3 and enter the sample collector 7, so that the separation of the wind samples is realized, and the purpose of sampling is achieved.
Specifically, the pressure gas 11 enters between the inner layer pipe and the outer layer pipe, the air inlet direction 13 of the pressure gas is shown in figure 1, the pressure gas enters the drill hole 10, the air return direction 14 is shown in figure 1, and the coal powder or rock powder 15 enters the inner layer pipe along with the gas. The sample collector 7 is hopper-shaped, the lower part is provided with a valve 9, the negative pressure providing device 8 is connected to the sample collector 7 through a pipeline, and a gauze is arranged at one end of the pipeline, which is positioned at the sample collector 7, so that the coal powder or the rock powder 15 is prevented from flowing into the negative pressure providing device 8.
The sampling drill bit 1 is used for cutting a sample and guiding the sample to flow through the middle of the sampling drill bit 1; the ejector 2 is integrated with the sampling drill bit 1 in the sampling drill bit 1, is a connecting device for connecting the sampling drill bit 1 and an inner pipe of a double-wall drill rod 3 of the double-wall drill rod 3, and utilizes recoil force to guide pressure gas 11 and a sample in a drill hole 10 to enter the inner pipe of the double-wall drill rod 3 from the drill bit by forming part of wind current of reflected current when the pressure gas 11 reaches the bottom of the sampling drill bit 1 and entering the inner pipe of the double-wall drill rod 3; the double-wall drill rod 3 is a channel for realizing the conversion of the inside and outside flow of the pressure gas 11 from the double-wall drill rod 3; the air tap 5 is a device for converting the circulation of the pressure gas 11 from the annular space of the double-wall drill rod 3 to the inner pipe of the double-wall drill rod 3; the sample collector 7 is a device for separating gas-solid mixed fluid of an inner layer pipe of the double-wall drill rod 3 to obtain pure samples with different particle sizes, and can reduce the dust concentration in the drilling process; the hole sealing capsule 4 with the bearing is used for sealing the space between the double-wall drill rod 3 and the wall of the drill hole 10, so that the wind flow in the drill hole 10 flows out from the inner-layer pipe of the double-wall drill rod 3 to form full reverse circulation, the air flow is ensured to pass through the inner-layer pipe of the double-wall drill rod 3, and a better sampling effect is achieved; adjustable air exhauster form great (more than or equal to 30kPa) in order to carry out the drainage with the air current of sampling drill bit 1 front end, make the inner pipe of more entering double-walled drilling rod 3 of air current, reach better sample effect under the combined action of pressure gas 11 and adjustable air exhauster.
The principle of gas sampling: the negative pressure effect of the adjustable exhaust fan is utilized to increase the gas flow in the closed wall 18 or the fire area, the gas in the closed wall 18 or the fire area is pumped out of the closed wall 18 or the fire area, and the sampling is carried out from the sampling hole 20 after the pump is stopped, so that a more reliable gas sample is obtained.
Sample drill bit 1 links to each other with ejector 2 is fixed, and ejector 2 connects annular space and ejector 2 inner space between sample drill bit 1 and the ejector 2, and double-walled drilling rod 3 includes: the double-wall drill pipe comprises an outer pipe, an inner pipe of a double-wall drill pipe 3, an inner pipe space of the double-wall drill pipe 3 and an annular space between the inner pipe and the outer pipe of the double-wall drill pipe 3, an ejector 2 is fixedly connected with the inner pipe of the double-wall drill pipe 3, the inner space of the ejector 2 is communicated with the inner pipe space of the double-wall drill pipe 3, the annular space between a sampling drill bit 1 and the ejector 2 is communicated with the annular space between the inner pipe and the outer pipe of the double-wall drill pipe 3, the inner pipe of the double-wall drill pipe 3 is spliced and sealed by a sealing ring, the outer pipe of the double-wall drill pipe 3 is in threaded connection, the inner pipe and the outer pipe of the double-wall drill pipe 3 are connected by welding, an air tap 5 adopts a double-layer cavity, an inner cavity of the air tap 5 is communicated with the inner pipe space of the double-wall drill pipe 3, the inner pipe, the outer, the wind and water faucet 5 can realize the communication conversion between the inner cavity of the water faucet and the outer cavity of the water faucet, the drilling machine 6 is clamped on the double-wall drill rod 3 to provide the rotation of the double-wall drill rod 3 and provide the power for pushing and retreating, and the sample collecting device is connected with the inner pipe of the double-wall drill rod 3 and is communicated with the inner pipe space of the double-wall drill rod 3. The hole sealing capsule 41 with the bearing 42 is connected with the double-wall drill rod 3 by the bearing 42.
The specific method for sampling by adopting the underground pressure gas 11 fixed-point sampling equipment comprises the following steps: in the drilling process, a drilling machine 6 drives a double-wall drill rod 3 to drill forwards, when the double-wall drill rod reaches a sampling position after a certain depth, pressure gas 11 is utilized to fully blow and wash residual samples in the internal space of a system from an air-water tap 5, an annular space of an inner pipe and an outer pipe of the double-wall drill rod 3, a sampling drill bit 1, an inner pipe of the double-wall drill rod 3, an air-water tap 5 and a sample collecting device, at the moment, the drill bit cuts coal bodies to obtain samples of sampling places, meanwhile, the pressure gas 11 enters the annular space between the inner pipe and the outer pipe of the double-wall drill rod 3 through an outer cavity of the water tap and then reaches the bottom of the drill bit, one part of the pressure gas 11 enters the internal space of an ejector 2 through an ejection hole of the ejector 2 to form ejection flow, the other part, the sample cut by the sampling drill bit 1 is washed, the sample enters the inner space of the ejector 2 through the air inlet of the drill bit, the adjustable exhaust fan is started during sampling, negative pressure is formed in the inner pipe of the sample collection device, the air faucet 5, the double-wall drill rod 3 and the inner space of the sampling drill bit 1, the sample flows to the sample collector 7 from the inner pipe space of the double-wall drill rod 3 through the inner pipe space of the air faucet 5 under the drive of the ejector flow and the negative pressure of the adjustable exhaust fan, the valve 9 at the moment is in a closed state, and the valve 9 can be opened to collect the sample after sampling.
The positive pressure sampling is adopted to reduce the influence of wind flow on the analysis speed of the coal sample, so that pulverized coal under the cuttings of the front section of the drill bit continuously and quickly enters the collecting device from the center of the drill rod, the sampling success rate is improved, and the obtained coal sample is closer to the reality in the determination result when the gas content is determined.
The foregoing is only a preferred embodiment of the present invention, and many variations in the specific embodiments and applications of the invention may be made by those skilled in the art without departing from the spirit of the invention, which falls within the scope of the claims of this patent.
Claims (8)
1. Fixed point sampling device in pit for sample in drilling, its characterized in that: the underground fixed-point sampling device comprises a double-wall drill rod, a sampling drill bit, a hole sealing capsule with a bearing, a wind water tap, a drilling machine and a sample collector, wherein the double-wall drill rod comprises an inner-layer pipe and an outer-layer pipe which are sleeved, a gas circulation gap is formed between the inner-layer pipe and the outer-layer pipe, the first end of the inner-layer pipe and the first end of the outer-layer pipe are both connected to the sampling drill bit, a channel for communicating the gas circulation gap with the space in a drill hole is arranged at the position, close to the first end, of the outer-layer pipe, a first end of the inner-layer pipe is opened and enables the inner layer to be communicated with the space in the drill hole, a power end of the drilling machine is held on the wall of the double-wall drill rod and can drive the sampling drill bit to rotate through the double-wall drill rod, the wind water tap is installed at the second end of the outer-, the inner pipe is connected with an inner pipe of the air tap, an inner pipe port is opened, the air tap inner pipe is connected to the sample collector, and the sample collector is arranged at the outlet end of the air tap; the hole sealing capsule with the bearing is arranged at the inner section of the outer layer pipe, which is positioned in the drill hole, and is used for sealing the gap between the outer layer pipe and the inner wall of the drill hole and providing rotary support for the double-wall drill rod;
the pressure fluid can enter the drill hole through the external port and the gas circulation gap, and the sample to be sampled in the drill hole is led out to the sample collector from the inner layer pipe through the fluid pressure.
2. The downhole localized sampling device of claim 1, wherein: the hole sealing capsule with the bearing comprises a hole sealing capsule and a bearing, wherein the inner ring of the bearing is fixedly sleeved on the outer ring surface of the outer layer pipe, the hole sealing capsule is arranged on the outer ring of the bearing, and the hole sealing capsule can radially expand to increase the radial area.
3. The downhole localized sampling device of claim 1, wherein: and the sampling drill bit is provided with an ejector.
4. The downhole localized sampling device of claim 1, wherein: the sample collector is connected with a negative pressure supply device which is used for providing negative pressure for the inner layer tube.
5. The downhole localized sampling device of claim 4, wherein: the negative pressure providing device is an adjustable exhaust fan or an extraction high negative pressure pipeline.
6. The downhole localized sampling device of claim 4, wherein: the air inlet of the negative pressure providing device is connected with the air outlet end of the inner pipe of the air tap through a steel wire framework rubber pipe, and the steel wire framework rubber pipe is provided with a sampling hole.
7. The downhole localized sampling device of claim 1, wherein: the sample collection device is made of transparent material and is provided with scales.
8. A downhole fixed-point sampling method using the downhole fixed-point sampling device according to any one of claims 1 to 7, characterized in that: comprises that
(1) The solid sample method was taken: the drilling machine drills to a sampling place, and the path through which the sample passes is cleaned by compressed air. Fixing a hole sealing capsule with a bearing on a drill rod, pushing the hole sealing capsule to a drill hole opening, and inflating the capsule to seal the drill hole; the drilling machine starts to drill, opens the compressed air and opens the negative pressure providing device, the sample cut by the drill bit reaches the sample collecting device through the inner pipe, when the sample reaches the collecting scale requirement, the compressed air is closed, the drilling is stopped and the negative pressure providing device is closed, and the solid sample is collected to the coal sample tank; deflating the hole sealing capsule with the bearing, separating the capsule wall from the drill hole orifice wall, starting a drilling machine to connect the drill rod outside the drill hole with a first connector, opening the first connector, detaching the hole sealing capsule with the bearing from the drill rod, and connecting the drill rod;
(2) adopting a method of sealing gas samples in the goaf: when sampling, firstly connecting an air inlet of the negative pressure providing device with a closed inner observation tube through a steel wire skeleton rubber tube, plugging a sampling hole with a rubber plug, starting the negative pressure providing device to perform air extraction, closing the negative pressure providing device after 3 minutes of air extraction, and opening the rubber plug of the sampling hole to take an air sample through a negative pressure sampler;
(3) adopting a fire area gas sample method: predicting the position of a fire area, driving a sampling drill bit and a double-wall drill rod to drill to the position of the preset fire area by using a drilling machine, plugging a drill hole opening by using rubber with a bearing after the drilling is stopped, sealing a hole between the bearing and the drill rod by using other sealing materials, closing a valve at the air inlet end of an air-water tap, opening an adjustable fan to extract a gas sample of the fire area, stopping a pump after 3 minutes, and taking the gas sample through a sampling port.
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Address after: 113122 No.11 Binhe Road, Shenfu demonstration area, Fushun City, Liaoning Province Applicant after: Shenyang Research Institute Co.,Ltd. Address before: 113122 No. 11 Binhe Road, Fushun Economic Development Zone, Fushun City, Liaoning Province Applicant before: CCTEG (China Coal Technology and Engineering Group Corp.) |
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Application publication date: 20200421 |