CN112343659A - Coal rock coal directional cross-layer drilling coal seam gas pressure measuring method - Google Patents
Coal rock coal directional cross-layer drilling coal seam gas pressure measuring method Download PDFInfo
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- CN112343659A CN112343659A CN202011281738.1A CN202011281738A CN112343659A CN 112343659 A CN112343659 A CN 112343659A CN 202011281738 A CN202011281738 A CN 202011281738A CN 112343659 A CN112343659 A CN 112343659A
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- coal
- gas pressure
- coal seam
- rock
- pressure measuring
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- 239000003245 coal Substances 0.000 title claims abstract description 101
- 239000011435 rock Substances 0.000 title claims abstract description 43
- 238000005553 drilling Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000007789 sealing Methods 0.000 claims abstract description 35
- 229920000742 Cotton Polymers 0.000 claims description 8
- 239000011083 cement mortar Substances 0.000 claims description 7
- 238000009530 blood pressure measurement Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- 239000004568 cement Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
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Classifications
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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
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/18—Special adaptations of signalling or alarm devices
-
- 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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
- E21B33/138—Plastering the borehole wall; Injecting into the formation
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
Abstract
The invention relates to a coal seam gas pressure measuring method, in particular to a coal rock coal directional cross-layer drilling coal seam gas pressure measuring method, which comprises the following steps: drilling downwards from the coal wall of the roadway to the direction of the coal seam floor by using a directional drilling machine, wherein the drilled holes firstly enter the rock stratum from the coal seam floor, and then penetrate through the coal seam floor and then enter the coal seam, so that the head section and the tail section of the drilled holes are positioned in the coal seam, and the middle section of the drilled holes is positioned in the rock stratum; placing a measuring part of a gas pressure measuring device in a drill hole, and placing a gas collecting part in the gas pressure measuring device in a rock stratum at the middle section of the drill hole; grouting and sealing the drill hole, wherein the sealing depth extends from the hole opening of the drill hole to the middle rock stratum of the drill hole, and a gas collecting part in the gas pressure measuring device leaks out of the sealing section; and after hole sealing is carried out on the hole sealing section, observing the coal bed gas pressure for a period of time to obtain a coal bed gas pressure measured value.
Description
Technical Field
The invention relates to a method for measuring gas pressure of a coal bed, in particular to a method for measuring gas pressure of a coal bed of coal rock coal directional cross-layer drilling.
Background
The gas pressure is an important index in the basic parameters of the coal bed gas, the gas flow and the power in the coal body are reflected, and the gas pressure is also an important mark of the potential capacity of gas outburst, and has important significance for gas treatment and extraction of coal mines.
In a mine for measuring gas pressure by drilling holes in a cross layer in unconditional construction, the gas pressure of a coal bed is generally measured by adopting the coal bed bedding drilling holes, but the tightness of the coal bed bedding pressure measuring drilling holes is difficult to ensure due to the influence of coal body cracks, so that the measured value of the gas pressure is smaller. In recent years, bedding drilling pressure measurement is basically adopted in coal mines with unconditional construction of bedding drilling, and the sealing length is more than 50m so as to ensure the air tightness of the drilling. The gas pressure measurement needs better hole sealing conditions, has more influence factors in the bedding hole pressure measurement process, and cannot eliminate the interference and influence of cracks in the coal bed on the pressure measurement result.
Disclosure of Invention
In order to solve the problems, the coal-rock coal directional cross-layer drilling coal seam gas pressure measuring method provided by the invention can accurately measure the gas pressure of the coal seam.
In order to achieve the purpose, the invention adopts the technical scheme that:
a coal rock coal directional cross-layer drilling coal seam gas pressure measuring method comprises the following steps:
and 4, after hole sealing is carried out on the hole sealing section for T hours, observing the coal bed gas pressure for T days to obtain a coal bed gas pressure measured value.
Preferably, the bore is a continuous smooth arcuate bore.
Preferably, the trailing end of the borehole penetrates the entire coal seam.
Preferably, in step 4, t.gtoreq.24 and T.gtoreq.30.
Preferably, the length of the hole sealing section is not less than 5 meters; the rock bore section in the borehole is greater than 5 meters.
Preferably, the gas pressure measuring device comprises a pressure measuring pipe, cotton yarn, a gas collecting pipe, a baffle, a cement mortar pool, an injection pump and a pressure gauge, wherein the front end of the pressure measuring pipe is the gas collecting pipe, the cotton yarn and the baffle are sleeved at the joint of the pressure measuring pipe and the gas collecting pipe, the pressure gauge is arranged at the rear end of the pressure measuring pipe, and a valve is arranged between the pressure gauge and the pressure measuring pipe; the feed end of the grouting pump is connected to the cement mortar pool through a hose, and the discharge end of the grouting pump is connected to a gap between the drill hole and the piezometer tube through a hose.
Preferably, the piezometric tube is composed of spliced galvanized tubes with the diameter of 20mm, the length of each galvanized tube is 3m, and the joints of two adjacent galvanized tubes are connected by tube hoops after being wound by raw material belts.
Preferably, the length of the gas collecting pipe is 3m, and a plurality of gas passing holes with the diameter of 5mm are formed in the surface of the gas collecting pipe.
The beneficial effects of the invention are as follows:
according to the coal-rock coal directional cross-layer drill hole, the drill hole is provided with one section of coal-bed section hole sealing and one section of rock section hole sealing, so that the air tightness of the drill hole is guaranteed, gas is effectively sealed, the measured gas pressure can reflect the actual condition, the measured gas pressure is more accurate, and the phenomenon that the measured pressure is influenced by the coal-bed crack and is lower than the actual pressure only by using the coal-bed drill hole for measuring the pressure is eliminated.
The middle-crossing arc-shaped drill hole can more accurately select a target coal-seeing point, has large length, and is selected to be distributed in a region which is not influenced by mining, is not in a coal seam pressure relief region, and is not near an extraction drill hole and a ground well.
Drawings
FIG. 1 is a schematic diagram of the direction of drilling holes in the coal seam gas pressure measurement method for coal-rock coal directional cross-layer drilling.
FIG. 2 is a schematic diagram of an arc-shaped drilling hole sealing process in the coal-rock coal directional cross-layer drilling coal seam gas pressure measurement method.
Fig. 3 is a gas pressure rising curve diagram of a No. 1 pressure measuring hole in the embodiment of the method for measuring the gas pressure of the coal seam of the coal-rock coal directional cross-layer drilled hole.
Fig. 4 is a gas pressure rising curve diagram of a No. 2 pressure measuring hole in the embodiment of the method for measuring the gas pressure of the coal seam of the coal-rock coal directional cross-layer drilled hole.
The reference numerals include:
1-laneway; 2-coal bed; 3-sealing the hole section; 4, drilling; 5-piezometric tube; 6-cotton yarn; 7-a gas collecting pipe; 8-cement slurry; 9-a valve; 10-a baffle plate; 11-a cement mortar pool; 12-grouting pump; 13-pressure gauge.
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.
As shown in fig. 1 and fig. 2, the method for measuring gas pressure of a coal seam 2 of a coal-rock coal directional cross-layer drilled hole 4 provided in this embodiment includes the following steps:
and 4, after hole sealing is carried out on the hole sealing section 3 for 24 hours, observing the gas pressure of the coal seam 2 for 30 days to obtain the gas pressure measured value of the coal seam 2.
Preferably, the bore 4 is a continuous smooth arcuate hole. The tail end of the drill hole 4 penetrates through the whole coal seam 2, and the gas pressure can be accurately measured.
The length of the hole sealing section 3 is not less than 5 m; the section of rock bore in the borehole 4 is greater than 5 metres.
The gas pressure measuring device comprises a pressure measuring pipe 5, cotton yarn 6, a gas collecting pipe 7, a baffle plate 10, a cement mortar pool 11, an injection pump 12 and a pressure gauge 13, wherein the gas collecting pipe 7 is arranged at the front end of the pressure measuring pipe 5, the cotton yarn 6 and the baffle plate 10 are sleeved at the joint of the pressure measuring pipe 5 and the gas collecting pipe 7, the pressure gauge 13 is arranged at the rear end of the pressure measuring pipe 5, and a valve 9 is arranged between the pressure gauge 13 and the pressure measuring pipe 5; the feed end of the grouting pump 12 is connected into the cement mortar pool 11 through a hose, and the discharge end of the grouting pump 12 is connected into a gap between the drill hole 4 and the piezometer tube 5 through a hose.
The piezometric tube 5 comprises the galvanized pipe of the concatenation of diameter 20mm, and the length of every galvanized pipe is 3m, connects with the ferrule after the junction twines with the raw material area between two adjacent galvanized pipes.
The length of the gas collecting pipe 7 is 3m, and a plurality of gas passing holes with the diameter of 5mm are formed in the surface of the gas collecting pipe.
Example 1
In this embodiment, 2 pressure measurement sites are set in a certain mine, and first, a drill hole 4 is formed, as shown in fig. 1, and parameters of the drill hole 4 are shown in table 1.
TABLE 1 arc-shaped Long drilling parameters for a given mine
After the opening is completed, the valve 9 is closed, and the pressure measuring tube 5 with the gas collection tube 7 is inserted into the borehole 4, as shown in fig. 2, wherein the baffle 10 cooperates with the cotton gauze 6, which functions to determine the centrality of the gas collection tube 7 and the pressure measuring tube 5 in the borehole 4 and at the same time to limit the distance the cement slurry 8 enters the borehole 4. After the position of the pressure measuring pipe 5 is determined, the injection of cement slurry 8 into the gap between the pressure measuring pipe 5 and the borehole 4 by the injection pump 12 is started. And stopping grouting when the drill hole 4 is full of slurry, sealing the hole opening by using yellow mud, and finishing the hole sealing of the pressure measuring hole. And after the hole sealing time reaches 24 hours, installing a pressure gauge 13 and a three-way valve 9 on the exposed part of the four-way pipe, and strictly checking that the pressure measuring pipe 5 and the ball valve, the ball valve switch, the ball valve and the pressure gauge 13 are airtight. The time for normally observing the gas pressure is generally about 30 days.
TABLE 2 gas pressure measurement results of No. 3 coal seam, No. 2 coal seam and 2 coal seam
As shown in table 2, the pressure in the pressure measuring hole No. 1 at the pressure measuring point a rapidly increases to 0.18MPa in 7 days, increases to 0.18-0.2 MPa after 5 days of stabilization, then increases to the maximum value of 0.29MPa, and tends to stabilize after 19 days, and the specific pressure increase curve is shown in fig. 3.
The pressure increase curve of the gas pressure of the pressure measuring hole No. 2 at the pressure measuring place B is shown in figure 4, the pressure of the pressure measuring hole rapidly increases to 0.14MPa in 4 days, slowly increases to the value of 0.16MPa after being stabilized for 4 days, reaches the maximum value of 0.18MPa after being stabilized for 2 days, and tends to be stable after 11 days.
TABLE 3 comparison of the effects of arc drilling and full coal seam pressure measurement drilling
As can be seen from Table 3, the data measured by ordinary borehole pressure measurement is relatively small, mainly the coal seam 2 itself fracture and rock are relatively high in development degree, even if the hole sealing depth reaches 50m, some gas still seeps out from the fracture, and certain deviation is brought to the measurement of gas pressure. The coal-rock coal directional cross-layer drilling coal seam gas pressure measuring method has the advantages of rock hole section hole sealing, higher accuracy and about 20% improvement compared with the common drilling pressure measuring result.
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. A coal rock coal directional cross-layer drilling coal seam gas pressure measuring method is characterized by comprising the following steps:
step 1, drilling a hole downwards from the coal wall of a roadway to the direction of a coal seam floor by using a directional drilling machine, wherein the drilled hole firstly enters a rock stratum from the coal seam floor, and then penetrates through the coal seam floor and then enters the coal seam, so that the head section and the tail section of the drilled hole are located in the coal seam, and the middle section of the drilled hole is located in the rock stratum;
step 2, placing a measuring part of the gas pressure measuring device in the drill hole, and placing a gas collecting part in the gas pressure measuring device in a rock stratum at the middle section of the drill hole;
step 3, grouting and sealing the drill hole, wherein the sealing depth extends from the drill hole opening to the middle rock stratum of the drill hole, and a gas collecting part in the gas pressure measuring device leaks from the sealing section;
and 4, after hole sealing is carried out on the hole sealing section for T hours, observing the coal bed gas pressure for T days to obtain a coal bed gas pressure measured value.
2. The method for measuring the gas pressure of the coal seam of the coal-rock coal directional cross-layer drilled hole according to claim 1, characterized by comprising the following steps: the drilling holes are continuous smooth arc-shaped holes.
3. The method for measuring the gas pressure of the coal seam of the coal-rock coal directional cross-layer drilled hole according to claim 1, characterized by comprising the following steps: the tail end of the borehole penetrates the entire coal seam.
4. The method for measuring the gas pressure of the coal seam of the coal-rock coal directional cross-layer drilled hole according to claim 1, characterized by comprising the following steps: in step 4, T is not less than 24, and T is not less than 30.
5. The method for measuring the gas pressure of the coal seam of the coal-rock coal directional cross-layer drilled hole according to claim 1, characterized by comprising the following steps: the length of the hole sealing section is not less than 5 m; the rock bore section in the borehole is greater than 5 meters.
6. The method for measuring the gas pressure of the coal seam of the coal-rock coal directional cross-layer drilled hole according to claim 1, characterized by comprising the following steps: the gas pressure measuring device comprises a pressure measuring pipe, cotton yarn, a gas collecting pipe, a baffle, a cement mortar pool, a grouting pump and a pressure gauge, wherein the front end of the pressure measuring pipe is the gas collecting pipe, the cotton yarn and the baffle are sleeved at the joint of the pressure measuring pipe and the gas collecting pipe, the pressure gauge is arranged at the rear end of the pressure measuring pipe, and a valve is arranged between the pressure gauge and the pressure measuring pipe; the feed end of the grouting pump is connected to the cement mortar pool through a hose, and the discharge end of the grouting pump is connected to a gap between the drill hole and the piezometer tube through a hose.
7. The method for measuring the gas pressure of the coal seam of the coal-rock coal directional cross-layer drilled hole according to claim 6, characterized by comprising the following steps: the piezometric tube comprises the galvanized pipe of the concatenation of diameter 20mm, and the length of every galvanized pipe is 3m, connects with the ferrule after the sealing tape twines between two adjacent galvanized pipes.
8. The method for measuring the gas pressure of the coal seam of the coal-rock coal directional cross-layer drilled hole according to claim 6, characterized by comprising the following steps: the length of the gas collecting pipe is 3m, and a plurality of gas passing holes with the diameter of 5mm are formed in the surface of the gas collecting pipe.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2020107753021 | 2020-08-04 | ||
| CN202010775302 | 2020-08-04 |
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| CN112343659A true CN112343659A (en) | 2021-02-09 |
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Citations (9)
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|---|---|---|---|---|
| CN103161447A (en) * | 2013-03-12 | 2013-06-19 | 中国矿业大学 | Method of conducting bedding pressure measuring through directional drilling |
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| CN109707371A (en) * | 2018-11-19 | 2019-05-03 | 太原理工大学 | A kind of quickly measurement coal bed drilling depth mechanism and method |
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| CN110424949A (en) * | 2019-06-24 | 2019-11-08 | 中国矿业大学 | The Inversion Calculation method that coal-bed gas parameter is quickly tested with brill |
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2020
- 2020-11-16 CN CN202011281738.1A patent/CN112343659A/en active Pending
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| CN109751075A (en) * | 2019-03-08 | 2019-05-14 | 湖南科技大学 | Middle hard coal seam concordant drilling gas administering method |
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Address after: 113122 No.11 Binhe Road, Shenfu New District, Fushun City, Liaoning Province Applicant after: Shenyang Research Institute Co.,Ltd. Address before: 113122 No.11 Binhe Road, Shenfu New District, Fushun City, Liaoning Province Applicant before: CCTEG (China Coal Technology and Engineering Group Corp.) |
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