AU2018403373A1 - Reciprocating sampling method and device for use in fixed-point sampling of gas content - Google Patents
Reciprocating sampling method and device for use in fixed-point sampling of gas content Download PDFInfo
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- AU2018403373A1 AU2018403373A1 AU2018403373A AU2018403373A AU2018403373A1 AU 2018403373 A1 AU2018403373 A1 AU 2018403373A1 AU 2018403373 A AU2018403373 A AU 2018403373A AU 2018403373 A AU2018403373 A AU 2018403373A AU 2018403373 A1 AU2018403373 A1 AU 2018403373A1
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- core tube
- coal core
- coal
- hollow drill
- sampling
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- 238000005070 sampling Methods 0.000 title claims abstract description 74
- 238000000034 method Methods 0.000 title claims abstract description 26
- 239000003245 coal Substances 0.000 claims abstract description 169
- 238000005553 drilling Methods 0.000 claims abstract description 35
- 238000007789 sealing Methods 0.000 claims abstract description 14
- 238000000605 extraction Methods 0.000 claims description 13
- 238000003795 desorption Methods 0.000 description 4
- 239000000428 dust Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000029052 metamorphosis Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
Classifications
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B25/00—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or core extractors
- E21B25/06—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or core extractors the core receiver having a flexible liner or inflatable retaining means
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
-
- 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
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2294—Sampling soil gases or the like
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- Life Sciences & Earth Sciences (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Chemical & Material Sciences (AREA)
- Pathology (AREA)
- Immunology (AREA)
- General Physics & Mathematics (AREA)
- General Health & Medical Sciences (AREA)
- Biochemistry (AREA)
- Analytical Chemistry (AREA)
- Geochemistry & Mineralogy (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Molecular Biology (AREA)
- Biomedical Technology (AREA)
- Soil Sciences (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The present invention relates to a reciprocating sampling method and device for use in fixed-point sampling of gas content, wherein the method comprises the following steps: 1) performing sectional drilling, according to a predetermined drilling path, on a hollow drill which has a coal core tube fixed at the front end thereof; 2) when the hollow drill drills to a predetermined depth for sampling, pushing the coal core tube to the front end of the hollow drill for fixation, and when the hollow drill once again drills to a sampling length and a coal sample enters within the coal core tube, inflating an air bag at the front end of the coal core tube and sealing the front end of the coal core tube after the expansion of the air bag; 3) taking out the sealed coal core tube along the inner hole of the hollow drill, and taking out the coal sample from the coal core tube after the air bag is deflated, thus completing fixed-point sampling.
Description
Field of the Invention
The present invention relates to the field of geological drilling technologies, and in particular, to a reciprocating sampling method and device for use in fixed-point sampling of gas content.
Description of Related Art A desorption method is mainly used at present to directly measure a gas content of a coal seam underground, which specifically includes the following three steps: 1. drilling in a newly exposed coal wall, a stone gate, or a rock roadway to collect a coal sample; 2. performing natural desorption underground and measuring a gas content; and 3. measuring the content of residual gas in a laboratory. Steps 2 and 3 have mature theory, and accordingly have a negligible impact on a measured value of the gas content. However, step 1 involves fixed-point sampling and calculation of a gas loss, which are two main factors responsible for an error in the measured value of the gas content. Underground measurement of the gas content in a coal mine necessarily resorts to a core extraction method using a coal core tube and a fixed-point sampling method based on orifice sampling. The main drawback of the orifice sampling lies in low purity of an obtained coal sample and a high level of "sample mixing", failing to implement fixed-point sampling. In the method using the coal core tube, a drilling tool is quickly withdrawn after completion of drilling for sampling, and the coal core tube is delivered to the hole bottom for drilling and core extraction; during sampling, sampling is implemented by drilling based on friction between the coal core tube and the coal seam; and after sampling completion, a drill is withdrawn, and a coal sample is taken out and placed into a special coal tank. This method can really achieve fixed-point sampling, but has the following problem: A sampling time in this method is far longer than a stipulated sampling time of 5 min. One end of the obtained coal sample is exposed for a long time. The friction between the coal core tube and the coal seam produces heat, causing temperature rise of the coal sample, inducing metamorphosis, and accelerating gas desorption in the coal sample. During a time period from drilling completion to delivery of the coal core tube to the hole bottom, gas in a target coal sample section on the hole bottom has begun to escape; however, a gas emission in this period is not considered in calculation of a gas loss in the obtained coal sample. Drilling in a soft coal seam has low stability, and re-drilling after the drill is withdrawn easily deviates from a predetermined drilling path, resulting in poor application of the sampling method using the coal core tube in the soft coal seam.
SUMMARY OF THE INVENTION To solve the foregoing problems, reduce the labor intensity of a sampling operation, and improve sampling accuracy and quality, the present invention provides a reciprocating sampling method for use in fixed-point sampling of gas content, which specifically includes the following steps:
1) performing sectional drilling, according to a predetermined drilling path, on a hollow drill which has a coal core tube fixed at the front end thereof; wherein after each section of drilling, the hollow drill is allowed to be stationary, the coal core tube and a coal seam which enters the coal core tube are taken out together along an inner hole of the hollow drill; and after the coal seam is taken out from the coal core tube, the coal core tube is pushed to the front end of the hollow drill along the inner hole of the hollow drill and is fixed, and then, a next section of drilling is performed along the predetermined drilling path;
2) when the hollow drill drills to a predetermined depth for sampling, disposing an air bag for sealing and connected to an inflation pipe at an opening at the front end of the coal core tube, and then pushing the coal core tube to the front end of the hollow drill along the inner hole of the hollow drill and fixing the coal core tube; when the hollow drill once again drills to a sampling length and a coal sample enters the coal core tube, inflating the air bag at the front end of the coal core tube via the inflation pipe, and sealing the front end of the coal core tube after expansion of the air bag; and
3) taking out the sealed coal core tube along the inner hole of the hollow drill, and taking out the coal sample from the coal core tube after the air bag is deflated, thus completing fixed-point sampling.
In the method of the present invention, the coal core tube is provided inside the hollow drill, and thus it is not required to withdraw the drill during the whole process from drilling to sampling. Sampling is implemented by operations of pushing the coal core tube in and taking it out, thus dramatically improving the sampling speed and making a sampling time shorter than a stipulated time of 5 min. By use of the method of the present invention, it is not required to withdraw and advance the drill in the whole drilling process, thus guaranteeing that the hollow drill performs drilling along a predetermined path all along. In this way, precision of fixed-point sampling can be improved, so that the sampling method using the coal core tube is applicable to a soft coal seam.
When a sampling point is reached, the drill is still used to perform drilling, thus solving the problem in the conventional sampling method that the generation of heat by friction between the coal core tube and the coal seam causes temperature rise of the coal sample, induces metamorphosis, and accelerates gas desorption in the coal sample. After the coal sample enters the coal core tube, the orifice of the coal core tube is sealed by expansion of the air bag after inflation, thus thoroughly preventing gas from escaping in the sampling process, and guaranteeing measurement accuracy of the gas content in the coal sample.
In addition, a large amount of dust is discharged during drilling in the conventional sampling method using the coal core tube. The method of the present invention resorts to a reciprocating drilling manner, and coal powder is completely taken out with the coal core tube, so that no dust leaks out in the whole process, without affecting the working environment.
To achieve the sampling method of the present invention, the present invention further provides a reciprocating sampling device for use in fixed-point sampling of gas content, which includes: a hollow drill, a coal core tube, and a core extraction rod.
The coal core tube is a cylinder with an opening on one end, and an outer diameter of the cylinder matches an inner diameter of the hollow drill; a front coal core tube limiter and a rear coal core tube limiter for fixing the coal core tube are provided on the front end of an inner sidewall of the hollow drill, the front coal core tube limiter being a fixing limiter, and the rear coal core tube limiter being a one-way limiter disposed backward; and the core extraction rod is a rigid drill rod provided with a removable connector at the front end, the connector being used to drive the rear coal core tube limiter and connected to the coal core tube.
A circular groove is provided in an inner sidewall at the opening of the coal core tube; an air bag is fitted inside the circular groove and is connected to an inflation pipe; and the inflation pipe is connected to an inflation valve.
Further, the inflation valve is disposed at the rear portion of the coal core tube.
Further, a sealing bag body is nested inside the coal core tube, and has an opening direction same as that of the coal core tube; and the air bag is connected at the opening of the sealing bag body.
Further, the one-way limiter is a limiting block resiliently connected to the inner sidewall of the hollow drill, and one end of the limiting block has an inclined surface and the other end has a vertical surface.
Further, the front coal core tube limiter is a circular limiting boss arranged along the inner sidewall of the hollow drill.
Further, an engaging protrusion is provided on the rear end of the coal core tube; the connector is a column matching an inner hole of the hollow drill, and the column has an opening at its front end; and a quick fastener used to be connected to the engaging protrusion is provided on the front end of the column.
The sampling device is used to implement the sampling method disclosed in the present invention, and has the following working principle: When sampling is required, an air inlet pipe of an external inflation mechanism is connected to the inflation valve of the inflation pipe on the coal core tube, and then the coal core tube is pushed via the core extraction rod to the front end of the hollow drill along an inner hole of the hollow drill. The front end of the coal core tube first triggers the rear coal core tube limiter, and drives it to move to lose limiting efficacy. The coal core tube is continuously pushed in till its rear end is located before the rear coal core tube limiter, and then the rear coal core tube limiter is reset to fix the coal core tube. In this case, the hollow drill performs drilling, and stops drilling after a coal sample completely enters the coal core tube. The air bag is inflated and the orifice of the coal core tube is closed after expansion of the air bag. Afterwards, the connector is connected to the top end of the core extraction rod, and the core extraction rod with the connector is pushed in along the inner hole of the hollow drill. The connector first drives the rear coal core tube limiter to move, and is connected to the engaging protrusion provided on the rear end of the coal core tube. Finally, the core extraction rod and the coal core tube are taken out together to complete sampling.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic structural diagram of a sampling device in the present invention.
DETAILED DESCRIPTION OF THE INVENTION Embodiment 1
A reciprocating sampling method for use in fixed-point sampling of gas content specifically includes the following steps:
1) Sectional drilling is performed, according to a predetermined drilling path, on a hollow drill which has a coal core tube fixed at the front end thereof. After each section of drilling, the hollow drill is allowed to be stationary, and the coal core tube and a coal seam which enters the coal core tube are taken out together along an inner hole of the hollow drill. After the coal seam is taken out from the coal core tube, the coal core tube is pushed to the front end of the hollow drill along the inner hole of the hollow drill and is fixed, and then, a next section of drilling is performed along the predetermined drilling path.
2) When the hollow drill drills to a predetermined depth for sampling, an air bag for sealing and connected to an inflation pipe is disposed at an opening at the front end of the coal core tube, and the coal core tube is then pushed to the front end of the hollow drill along the inner hole of the hollow drill and is fixed. When the hollow drill once again drills to a sampling length and a coal sample enters within the coal core tube, the air bag at the front end of the coal core tube is inflated via the inflation pipe, and the front end of the coal core tube is sealed after expansion of the air bag.
3) The sealed coal core tube is taken out along the inner hole of the hollow drill, and the coal sample is taken out from the coal core tube after the air bag is deflated, thus completing fixed-point sampling.
Embodiment 2
As shown in FIG. 1, a reciprocating sampling device for use in fixed-point sampling of gas content includes a hollow drill 1, a coal core tube 2, and a core extraction rod 4. The coal core tube 2 is a cylinder with an opening on one end, and an outer diameter of the cylinder matches an inner diameter of the hollow drill 1. A front coal core tube limiter 7 and a rear coal core tube limiter 6 for fixing the coal core tube 2 are provided on the front end of an inner sidewall of the hollow drill 1. The front coal core tube limiter 7 is a fixing limiter, and the rear coal core tube limiter 6 is a one-way limiter disposed backward. The core extraction rod 4 is a rigid drill rod provided with a removable connector 3 at the front end. The connector 3 is used to drive the rear coal core tube limiter 6 and connected to the coal core tube 2.
A circular groove is provided in an inner sidewall at the opening of the coal core tube 2. An air bag 5 is fitted inside the circular groove, and is connected to an inflation pipe 11. The inflation pipe 11 is connected to an inflation valve 12 which is disposed at the rear portion of the coal core tube 2. When not inflated, the whole air bag 5 is flat and clings to the circular groove, without impeding a coal sample from entering the coal core tube 2 through the opening of the coal core tube 2. After being inflated under a certain pressure, the air bag 5 completely expands and closes the opening of the coal core tube 2.
A sealing bag body 10 is nested inside the coal core tube 2, and has an opening direction same as that of the coal core tube 2. The air bag 5 is connected at the opening of the sealing bag body 10. The air bag 5 and the sealing bag body 10 are integrally connected. Thus, after the air bag expands by inflation, the coal sample can be wholly sealed inside the sealing bag body 10.
The one-way limiter is a limiting block resiliently connected to the hollow drill. One end of the limiting block has an inclined surface and the other end has a vertical surface. The vertical surface is disposed towards a limiting direction. When pushed on the vertical surface, the limiting block can effectively limit the coal core tube; while when pushed on the inclined surface, the limiting block can be pressed to the inner sidewall of the hollow drill or the coal core tube, thus being unable to limit the coal core tube.
The front coal core tube limiter 7 is a circular limiting boss arranged along the inner sidewall of the hollow drill 1.
An engaging protrusion 8 is provided on the rear end of the coal core tube 2. The connector 3 is a column matching an inner hole of the hollow drill 1, and a quick fastener 9 used to be connected to the engaging protrusion 8 is provided on the front end of the column. After the quick fastener 9 is connected to the engaging protrusion 8, the connector 3 is connected onto the rear end of the coal core tube 2 to form a whole. The connector 3 is provided with a through hole for arrangement of the inflation pipe, so that the inflation pipe is easily connected to the inflation valve 12 on the coal core tube 2 during sampling.
In this embodiment, the connector 3 may be in threaded connection with the core extraction rod 4. A specific structure of the quick fastener 9 may be in the form of a quick connector frequently used in the prior art, provided that the connector 3 can be pushed to be quickly connected to the engaging protrusion 8 on the rear end of the coal core tube and can be rapidly separated therefrom after the coal core tube is taken out. The connection manner between the connector 3 and the coal core tube 2 may be replaced with other frequently used means, such as threaded connection or magnetic attraction.
Claims (7)
1. A reciprocating sampling method for use in fixed-point sampling of gas content,
comprising the following steps:
1) performing sectional drilling, according to a predetermined drilling path, on a
hollow drill which has a coal core tube fixed at the front end thereof; wherein after
each section of drilling, the hollow drill is allowed to be stationary, the coal core tube
and a coal seam which enters the coal core tube are taken out together along an inner
hole of the hollow drill; and after the coal seam is taken out from the coal core tube,
the coal core tube is pushed to a front end of the hollow drill along the inner hole of
the hollow drill and is fixed, and then, a next section of drilling is performed along the
predetermined drilling path;
2) when the hollow drill drills to a predetermined depth for sampling, disposing an air
bag for sealing and connected to an inflation pipe at an opening at a front end of the
coal core tube, and then pushing the coal core tube to the front end of the hollow drill
along the inner hole of the hollow drill and fixing the coal core tube; when the hollow
drill once again drills to a sampling length and a coal sample enters the coal core tube,
inflating the air bag at the front end of the coal core tube via the inflation pipe, and
sealing the front end of the coal core tube after expansion of the air bag; and
3) taking out the sealed coal core tube along the inner hole of the hollow drill, and
taking out the coal sample from the coal core tube after the air bag is deflated, thus
completing fixed-point sampling.
2. A reciprocating sampling device for use in fixed-point sampling of gas content,
comprising: a hollow drill, a coal core tube, and a core extraction rod, wherein the
coal core tube is a cylinder with an opening on one end, and an outer diameter of the
cylinder matches an inner diameter of the hollow drill; a front coal core tube limiter
and a rear coal core tube limiter for fixing the coal core tube are provided on the front end of an inner sidewall of the hollow drill, the front coal core tube limiter being a fixing limiter, and the rear coal core tube limiter being a one-way limiter disposed backward; and the core extraction rod is a rigid drill rod provided with a removable connector at a front end, the connector being used to drive the rear coal core tube limiter and connected to the coal core tube; and a circular groove is provided in an inner sidewall at the opening of the coal core tube; an air bag is fitted inside the circular groove and is connected to an inflation pipe; and the inflation pipe is connected to an inflation valve.
3. The reciprocating sampling device for use in fixed-point sampling of gas content according to claim 2, wherein the inflation valve is disposed at a rear portion of the coal core tube.
4. The reciprocating sampling device for use in fixed-point sampling of gas content according to claim 2 or 3, wherein a sealing bag body is nested inside the coal core tube, and has an opening direction same as that of the coal core tube; and the air bag is connected at the opening of the sealing bag body.
5. The reciprocating sampling device for use in fixed-point sampling of gas content according to claim 2, wherein the one-way limiter is a limiting block resiliently connected to the hollow drill, and one end of the limiting block has an inclined surface and the other end has a vertical surface.
6. The reciprocating sampling device for use in fixed-point sampling of gas content according to claim 2, wherein the front coal core tube limiter is a circular limiting boss arranged along the inner sidewall of the hollow drill.
7. The reciprocating sampling device for use in fixed-point sampling of gas content according to claim 6, wherein an engaging protrusion is provided on the rear end of the coal core tube; the connector is a column matching an inner hole of the hollow drill, and the column has an opening at its front end; and a quick fastener used to be connected to the engaging protrusion is provided on the front end of the column.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810037322.1 | 2018-01-16 | ||
| CN201810037322.1A CN107991129A (en) | 2018-01-16 | 2018-01-16 | Reciprocating sampling method and device for gas bearing capacity spot sampling |
| PCT/CN2018/112672 WO2019140975A1 (en) | 2018-01-16 | 2018-10-30 | Reciprocating sampling method and device for use in fixed-point sampling of gas content |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU2018403373A1 true AU2018403373A1 (en) | 2020-08-27 |
| AU2018403373B2 AU2018403373B2 (en) | 2020-12-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2018403373A Ceased AU2018403373B2 (en) | 2018-01-16 | 2018-10-30 | Reciprocating sampling method and device for use in fixed-point sampling of gas content |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN107991129A (en) |
| AU (1) | AU2018403373B2 (en) |
| WO (1) | WO2019140975A1 (en) |
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| CN107991129A (en) * | 2018-01-16 | 2018-05-04 | 河南理工大学 | Reciprocating sampling method and device for gas bearing capacity spot sampling |
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| JP5920739B1 (en) * | 2014-11-14 | 2016-05-18 | 基礎地盤コンサルタンツ株式会社 | Ground sampling device and ground sampling method |
| CN105806650B (en) * | 2016-04-11 | 2018-05-04 | 中国地震局地球物理勘探中心 | Totally enclosed type soil layer surveys age sample soil sampler |
| CN107576773B (en) * | 2017-09-19 | 2019-11-05 | 湖南科技大学 | Coal sample sampler and coal and gas prominent monitoring system and prediction technique |
| CN107991129A (en) * | 2018-01-16 | 2018-05-04 | 河南理工大学 | Reciprocating sampling method and device for gas bearing capacity spot sampling |
| CN208350408U (en) * | 2018-01-16 | 2019-01-08 | 河南理工大学 | Reciprocating sampler for gas bearing capacity spot sampling |
-
2018
- 2018-01-16 CN CN201810037322.1A patent/CN107991129A/en active Pending
- 2018-10-30 AU AU2018403373A patent/AU2018403373B2/en not_active Ceased
- 2018-10-30 WO PCT/CN2018/112672 patent/WO2019140975A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| CN107991129A (en) | 2018-05-04 |
| AU2018403373B2 (en) | 2020-12-10 |
| WO2019140975A1 (en) | 2019-07-25 |
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