Underground pressure wind spot sampling device and process
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A technology of fixed-point sampling and air inlet, which is used in the extraction of undisturbed core devices, drilling equipment, earth-moving drilling, etc., can solve the problems of affecting the sampling effect, long sampling time, low success rate, etc. High-quality, simple-structured effects
Inactive Publication Date: 2014-08-06
CCTEG SHENYANG RES INST
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Problems solved by technology
Negative pressure injection makes the coal sample under negative pressure, which affects the desorption speed of the coal sample and destroys the desorption law of the coal sample, and the success rate of sampling is low due to the influence of the negative pressure; The coal sample is taken from the outer wall of the twist drill pipe. The coal sample flows from the inside to the outside and runs through the entire borehole. Affected by the disturbance of the twist drill pipe, the coal powder on the borehole wall may also be ground down. Therefore, the detailed sampling location of the coal sample It is unclear, which affects the sampling effect, and the twist drill pipe is affected by the ability of the drilling rig, and the sampling depth is shallow; the sampling drill bit must be replaced during the core pipe sampling drilling process, the procedure is more complicated, the sampling time is longer, and the desorption amount of the coal sample taken out Small, the measured gas content of the coal sample is small
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no. 1 example
[0017] see figure 1 , figure 2 , image 3 , Figure 4 , a downhole compressed air fixed-point sampling device, which is connected to the water transformer 4 with the compressed air joint 43 by the sample collection device 6 tubes, the double-walled drill pipe 3 connected to the water transformer 4 is connected to the drilling rig 5, and is connected by the double-walled drill pipe 3 The drill bit 1 is characterized in that: the outer wall of the drill bit 1 has four air outlet inclined holes 14, and the top of the drill bit 1 has an air inlet 15.
no. 2 example
[0019] see figure 1 , figure 2 , image 3 , Figure 4 , Figure 5 , a downhole compressed air fixed-point sampling device, which is connected to the water transformer 4 with the compressed air joint 43 by the sample collection device 6 tubes, the double-walled drill pipe 3 connected to the water transformer 4 is connected to the drilling rig 5, and is connected by the double-walled drill pipe 3 The drill bit 1 is characterized in that: the outer wall of the drill bit 1 has four air outlet inclined holes 14, and the top of the drill bit 1 has an air inlet 15.
[0020] Wherein: the drill bit 1 also includes an ejection tube body 2 with six ejection oblique holes 21 .
no. 3 example
[0022] see figure 1 , figure 2 , image 3 , Figure 4 , Figure 5 , a downhole compressed air fixed-point sampling device, which is connected to the water transformer 4 with the compressed air joint 43 by the sample collection device 6 tubes, the double-walled drill pipe 3 connected to the water transformer 4 is connected to the drilling rig 5, and is connected by the double-walled drill pipe 3 The drill bit 1 is characterized in that: the outer wall of the drill bit 1 has four air outlet inclined holes 14, and the top of the drill bit 1 has an air inlet 15.
[0023] Wherein: the drill bit 1 also includes an ejection tube body 2 with six ejection oblique holes 21 .
[0024] Wherein: drill bit 1 top is provided with drill bit outer tooth 12 four with drill bit outer tooth inner alloy 121 and drill bit outer tooth alloy 122, and drill bit inner tooth 13 three with drill bit inner tooth alloy 131.
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Abstract
The invention relates to an underground pressure wind spot sampling device. According to the underground pressure wind spot sampling device, a sample collection device is connected with a water converter with a pressure wind connector through a pipe, a double-wall drill pipe connected with the water converter is connected with a drilling machine, and the double-wall drill pipe is connected with a drilling bit. The underground pressure wind spot sampling device is characterized in that wind outlet inclined holes are formed in the outer wall of the drilling bit, and a wind inlet is formed in the top end of the drilling bit. The invention further discloses an underground pressure wind spot sampling process of the underground pressure wind spot sampling device. According to the underground pressure wind spot sampling device and process, positive-pressure sampling is realized, the drilling bit is provided with an injection pipe with injection inclined holes, and therefore negative-pressure smashed coal sampling is realized; besides, the structure is simple, spot sampling can be realized, the drilling bit does not need to be replaced, sampling is fast, and the quality of samples is high; according to the underground pressure wind spot sampling process, by the adoption of positive-pressure sampling, the influence of wind flow on the resolving speed of the coal samples can be reduced, as a result, coal powder below cuttings at the front end of the drilling bit can continuously and quickly enter the sample collection device through the center of the drill pipe, the sampling success rate is increased, and the determination result is more close to the actuality when the obtained coal samples are used for conducting gas content determination.
Description
technical field [0001] The invention relates to an underground compressed air sampling technology and a device, in particular to an underground coal mine compressed air sampling device and a sampling process. Background technique [0002] The determination of gas content is an essential raw data for gas emission prediction, gas control and gas drainage design. More than 70% of the mines in our country are high-gas mines, and the gas disaster restricts the safe mining of coal mines. Therefore, how to improve the sampling and measurement methods of the basic data of gas content has become a problem to be solved urgently. [0003] Researchers at home and abroad have conducted extensive and in-depth research on this issue. The current sampling methods include: negative pressure injection to take coal samples, twist drill pipe, core tube sampling, etc. Negative pressure injection makes the coal sample under negative pressure, which affects the desorption speed of the coal sample...
Claims
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Application Information
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