CN109269955B - In-situ testing device and method for permeability of coal stratum - Google Patents
In-situ testing device and method for permeability of coal stratum Download PDFInfo
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- CN109269955B CN109269955B CN201811146484.5A CN201811146484A CN109269955B CN 109269955 B CN109269955 B CN 109269955B CN 201811146484 A CN201811146484 A CN 201811146484A CN 109269955 B CN109269955 B CN 109269955B
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- 239000003245 coal Substances 0.000 title claims abstract description 69
- 230000035699 permeability Effects 0.000 title claims abstract description 58
- 238000012360 testing method Methods 0.000 title claims abstract description 52
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000010998 test method Methods 0.000 claims abstract description 7
- 239000002002 slurry Substances 0.000 claims description 27
- 239000011435 rock Substances 0.000 claims description 20
- 230000015572 biosynthetic process Effects 0.000 claims description 15
- 238000012544 monitoring process Methods 0.000 claims description 4
- 230000001133 acceleration Effects 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 230000005484 gravity Effects 0.000 claims description 2
- 238000005553 drilling Methods 0.000 abstract description 15
- 239000007788 liquid Substances 0.000 abstract description 7
- 238000005259 measurement Methods 0.000 abstract description 5
- 238000000605 extraction Methods 0.000 description 5
- 239000011440 grout Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 239000012530 fluid Substances 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 230000005641 tunneling Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
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- Analytical Chemistry (AREA)
- Dispersion Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Fluid Mechanics (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
An in-situ testing device and method for permeability of a coal stratum relates to measurement of the permeability of the coal stratum. The in-situ testing device for the permeability of the coal stratum comprises an assembly of a grouting pipe I, a grouting pipe II, a pressure-controlled setting device I and a pressure-controlled setting device II. The in-situ testing method for the permeability of the coal stratum comprises the steps of constructing a testing drilling hole in the coal stratum, installing and debugging the in-situ testing device for the permeability of the coal stratum, placing the testing drilling hole into the testing drilling hole, grouting to a preset pressure value, recording pressure attenuation, processing data and the like in real time. The in-situ test method for the permeability of the coal stratum can realize in-situ test of the permeability at any position and measurement of the regional coal stratum permeability field by adjusting the length of the grouting pipe, the test device can be reused, and the test process only needs to determine the viscosity of the grouting liquid, the closed drilling length between the pressure-controlled setting device I and the pressure-controlled setting device II and real-time attenuation data of the pressure of the grouting liquid I along with time, so that the operation is simple and convenient, and the test result is reliable.
Description
Technical Field
The invention relates to a coal stratum permeability test, in particular to a coal stratum permeability in-situ test device and method.
Background
Under the influence of ground stress, tunnel tunneling and coal seam mining, fracture networks with different development degrees and different spatial scales exist in coal rock layers under the coal mine and coal rock bodies around gas extraction drilling holes, and the fracture networks show a dynamic expansion evolution trend along with the coal seam mining. The coal stratum permeability determination has extremely important practical significance and engineering value for evaluating the coal stratum extractability, reasonably spatially arranging gas extraction drilling holes, determining the reasonable hole sealing positions of the drilling holes, evolving the coal stratum permeability in the gas extraction process and the like; meanwhile, the redistribution of the coal rock mass stress, rock mass damage and the determination of the forming position of a fracture ring caused by the coal mine operation process such as roadway tunneling are key to the efficient and safe support of the subsequent roadway. However, the existing coal seam permeability coefficient measurement is mostly determined according to a coal seam gas flow theory, specifically comprises a roadway one-way flow method, a drilling radial method and a ball flow method for measuring the coal seam permeability, but the method is only limited to determining the permeability of a coal and rock reservoir to gas through the flow of the coal seam gas. Therefore, in the sealing of gas extraction drilling holes, the determination of the permeability of slurry by coal rock mass broken cracks, primary cracks and pores is not determined effectively, so that the effective determination of reasonable hole sealing positions and hole sealing lengths of the gas extraction drilling holes is not provided with effective basis.
Disclosure of Invention
The invention aims to provide a device and a method which are simple in structure, convenient to operate, safe, reliable and efficient, and are suitable for in-situ direct measurement of permeability of coal seams and rock strata in coal mines and determination of positions of fracture rings of coal and rock laneways.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
the in-situ coal stratum permeability testing device comprises a grouting pipe I and a grouting pipe II, wherein a stop valve I, a one-way valve I, a pressure gauge I, a pressure relief pipe I and a grouting head I are sequentially arranged on the grouting pipe I, and the tail end of the grouting pipe I is sealed; the pressure relief pipe I is provided with a pressure relief valve I; the grouting pipe II is sequentially provided with a stop valve II, a one-way valve II, a pressure gauge II, a pressure relief pipe II, a front slurry outlet head II and a rear slurry outlet head II, and the pressure relief pipe II is provided with a pressure relief valve II; grouting pipe I and grouting pipe II run through pressure-controlled setting device I and pressure-controlled setting device II in proper order, and preceding play thick liquid head II sets up in pressure-controlled setting device I's inside, and back play thick liquid head II sets up in pressure-controlled setting device II's inside, goes out thick liquid head I and sets up between pressure-controlled setting device I and pressure-controlled setting device II.
As a further improved technical scheme of the invention, the grouting pipes I and II are multi-section grouting pipes, and the lengths of the grouting pipes I and II are adjusted by adjusting the section numbers of the grouting pipes.
As a further improved technical scheme of the invention, each section of the multi-section grouting pipe is in threaded connection or plug connection.
An in situ testing method for permeability of a coal formation, comprising the steps of:
s1: constructing a test borehole in a coal formation;
s2: placing the coal formation permeability in situ test apparatus of any one of claims 1-3 at a measured location of a test borehole;
s3: closing the pressure release valve II, opening the stop valve II, injecting slurry II into the pressure-controlled setting device I and the pressure-controlled setting device II, and monitoring the pressure of the slurry II by the pressure gauge II; stopping grouting and closing the stop valve II after the reading of the pressure gauge II reaches a first preset value;
s4: closing the pressure release valve I, opening the stop valve I, grouting through the grouting pipe I, monitoring the pressure of the slurry I by the pressure gauge I, stopping the grouting pump and closing the stop valve I after the reading of the pressure gauge I reaches a second preset value;
s5: recording the readings of the pressure gauge I at intervals, and stopping recording when the recorded readings of the pressure gauge I are the same three times continuously;
s6: the permeability of the coal formation at the measured location is calculated from the (readings of the) pressure gauge recorded at each time interval.
As a further improved technical scheme of the present invention, the step S6 further includes a step S7: and opening the pressure relief valve I to relieve pressure, opening the pressure relief valve II to relieve pressure, and taking out the coal stratum permeability in-situ test device.
As a further improved technical scheme of the invention, the first preset value is more than 1.2 times of the second preset value.
As a further improved technical scheme of the invention, the second preset value is smaller than the sum of the tensile strength and the ground stress of the coal rock at the position of the measured point.
As a further improved technical solution of the present invention, the step S6 specifically includes: according to the readings of the pressure gauge I recorded at each time interval, the permeability calculation is carried out according to the formula (1):
in the formula (1), P t For the reading of the pressure gauge I at the time t, v is the kinematic viscosity of the grouting liquid injected by the grouting pipe I, g is gravity acceleration, L is the length of a sealed drilling hole between the pressure-controlled setting device I and the pressure-controlled setting device II, C is a constant related to the diameter of the drilling hole, the original pressure of a reservoir and the water content of the reservoir, K is the permeability coefficient of the reservoir of the coal rock massIn mD, where 1 md= 9.8697 ×10 -16 m 2 。
Compared with the prior art, the invention has the beneficial effects that:
according to the in-situ testing device for the permeability of the coal stratum, the in-situ fixed-point testing of the permeability at any position can be realized by adjusting the lengths of the grouting pipe I and the grouting pipe II; the determination of the coal stratum seepage field can be realized through the tests of the permeability of different positions; meanwhile, the permeability testing device can be reused. The in-situ test method for the permeability of the coal stratum can determine the permeability of the tested point in situ by only testing the viscosity of the injected slurry, the length of a sealed drilling hole between the pressure-controlled setting device I and the pressure-controlled setting device II and real-time attenuation data of the pressure of the slurry I along with time, and has the advantages of simple and convenient operation and reliable test result.
Drawings
FIG. 1 is a schematic structural diagram of an in situ coal formation permeability testing apparatus according to example 1 of the present invention;
FIG. 2 is a schematic diagram of an in situ test method for permeability of a 2-coal formation in accordance with an embodiment of the present invention;
FIG. 3 is a schematic diagram of a pressure decay test curve of a measured point in an in-situ test method of permeability of a 2-coal stratum according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of the in situ test of permeability of 3 coal strata according to an embodiment of the invention,
in fig. 1-3: 1-grouting pipe I, 2-grouting pipe II, 3-stop valve II, 4-check valve II, 5-manometer II, 6-relief pipe II, 7-relief valve II, 8-pressure-controlled setting device I, 9-front grout head II, 10-pressure-controlled setting device II, 11-rear grout head II, 12-end, 13-grout head I, 14-relief pipe I, 15-relief valve I, 16-manometer I, 17-check valve I, 18-stop valve I, 19-coal stratum, 20-test drilling, 21-grout head II, 22-grout I.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
example 1
As shown in fig. 1, an in-situ testing device for permeability of a coal stratum comprises a grouting pipe I1 and a grouting pipe II2 which are arranged in parallel; the grouting pipe I1 is sequentially provided with a stop valve I18, a one-way valve I17, a pressure gauge I16, a pressure relief pipe I14 and a grouting head I13. The end of the grouting pipe I1 is welded and sealed by a head 12. The pressure relief pipe I14 is provided with a pressure relief valve I15, and the grouting pipe II2 is provided with a stop valve II3, a one-way valve II4, a pressure gauge II5, a pressure relief pipe II6, a front grouting head II9 and a rear grouting head II11 in sequence. The pressure relief pipe II6 is provided with a pressure relief valve II7. The grouting pipe I1 and the grouting pipe II2 which are arranged in parallel sequentially penetrate through the pressure-controlled setting device I8 and the pressure-controlled setting device II10. The front pulp outlet head II9 is arranged in the pressure-controlled setting device I8, the rear pulp outlet head II11 is arranged in the pressure-controlled setting device II10, and the pulp outlet head I13 is arranged between the pressure-controlled setting device I8 and the pressure-controlled setting device II10. The grouting pipe I1 and the grouting pipe II2 are multi-section grouting pipes, all the sections of the multi-section grouting pipes are in threaded connection or are in plug connection, and the length of each grouting pipe can be conveniently adjusted by adjusting the number of the sections of the grouting pipe according to the positions of measured points.
Example 2
As shown in fig. 2, an in situ testing method for permeability of a coal formation comprises the following steps:
a. constructing a test borehole 20 in the coal formation 19;
b. after the in-situ testing device for the permeability of the rock stratum in the embodiment 1 is installed and debugged, the in-situ testing device is placed at the tested position of the test drilling hole 20;
c. the grouting pipe II2 is connected with a grouting pump on site, a pressure release valve II7 is closed, a stop valve II3 is opened, the grouting pump is started to start to inject slurry II21 into the pressure-controlled setting device I8 and the pressure-controlled setting device II10, and the grouting pressure of the slurry II21 is monitored by a pressure gauge II 5;
d. after the pressure of the slurry II21 monitored by the pressure gauge II5 meets the expected requirement, closing the grouting pump and the stop valve II3; the grouting pipe I1 is connected with a grouting pump, a pressure relief valve I15 is closed, a stop valve I18 is opened, the grouting pump is started to start filling the slurry I22, and the filling pressure of the slurry I22 is monitored by a pressure gauge I16;
e. after the pressure of the slurry I22 monitored by the pressure gauge I16 meets the expected requirement, closing the grouting pump and the stop valve I18, and recording the reading of the pressure gauge I16 at regular time intervals in real time;
f. stopping data recording after the reading of the pressure meter I16 is stabilized three times continuously;
g. opening a pressure relief valve I15 to relieve pressure of slurry I22;
h. opening a pressure relief valve II7 to relieve pressure of the slurry II 21;
i. and taking out the in-situ testing device for the permeability of the coal stratum to finish the test of the permeability of a tested point.
Preferably, the pressure of the slurry II21 monitored by the pressure meter II5 in the step c is not less than 1.2 times that of the slurry I22 monitored by the pressure meter I16 in the step d; d, the pressure of the slurry I22 monitored by the pressure gauge I16 is smaller than the sum of the tensile strength and the ground stress of the coal rock at the measured point; the readings of the pressure gauge I16 recorded in real time in step e are subjected to permeability calculation according to the following formula:
wherein: p (P) t -pressure of the blocked slurry I22 at time t, pa
V-kinematic viscosity of slurry I22, m 2 /s
g-gravity acceleration, m/s 2
Closed borehole length, m, between L-pressure controlled setting device I8 and pressure controlled setting device II10
C-constant related to the diameter of the test borehole, the reservoir original pressure, the reservoir water cut, etc
K-coal rock mass reservoir permeability coefficient, mD (1 md= 9.8697 ×10 -16 m 2 )
FIG. 3 shows a plot of the pressure decay at a test site measured according to the test method described above.
Example 3
As shown in fig. 4, the measurement was performed using the coal formation permeability in-situ test method in example 2, the positions of the measured points (from point a to point B … … to point N) were sequentially adjusted, and the steps (a) to (e) were repeated to obtain permeability distribution (seepage field) in the region of the coal formation.
The coal-rock crack is a channel for fluid seepage, and the fluid pressure is the driving force of seepage in the coal-rock crack, and the invention is based on the resistance and pressure evolution of seepage of sealed high-pressure liquid in the coal rock stratum so as to realize the determination of the permeability of the coal-rock crack channel. It is to be understood that the invention is not limited to the examples described above, but is capable of modification and variation in light of the above teachings by those skilled in the art, all of which are intended to be included within the scope of the appended claims.
Claims (6)
1. The in-situ testing method for the permeability of the coal stratum is based on an in-situ testing device for the permeability of the coal stratum, and comprises a grouting pipe I (1) and a grouting pipe II (2), wherein a stop valve I (18), a one-way valve I (17), a pressure gauge I (16), a pressure relief pipe I (14) and a grouting head I (13) are sequentially arranged on the grouting pipe I (1), and the tail end of the grouting pipe I (1) is sealed; the pressure relief pipe I (14) is provided with a pressure relief valve I (15); a stop valve II (3), a one-way valve II (4), a pressure gauge II (5), a pressure relief pipe II (6), a front slurry outlet head II (9) and a rear slurry outlet head II (11) are sequentially arranged on the grouting pipe II (2), and a pressure relief valve II (7) is arranged on the pressure relief pipe II (6); the grouting pipe I (1) and the grouting pipe II (2) sequentially penetrate through the pressure-controlled setting device I (8) and the pressure-controlled setting device II (10), the front grouting head II (9) is arranged in the pressure-controlled setting device I (8), the rear grouting head II (11) is arranged in the pressure-controlled setting device II (10), the grouting head I (13) is arranged between the pressure-controlled setting device I (8) and the pressure-controlled setting device II (10),
the method comprises the following steps: s1: constructing a test borehole in a coal formation; s2: placing the coal stratum permeability in-situ testing device at a tested position of a test drill hole; s3: closing the pressure release valve II (7), opening the stop valve II (3), injecting the slurry II (21) into the pressure-controlled setting device I (8) and the pressure-controlled setting device II (10), and monitoring the pressure of the slurry II (21) by the pressure gauge II (5); stopping grouting and closing the stop valve II (3) after the reading of the pressure gauge II (5) reaches a first preset value; s4: closing the pressure release valve I (15), opening the stop valve I (18), grouting through the grouting pipe I (1), monitoring the pressure of the slurry I (22) by the pressure gauge I (16), stopping the grouting pump and closing the stop valve I (18) after the reading of the pressure gauge I (16) reaches a second preset value; s5: recording the readings of the pressure gauge I (16) at intervals, and stopping recording when the recorded readings of the pressure gauge I (16) are the same three times in succession; s6: calculating the permeability of the coal stratum at the measured position according to the reading of the pressure gauge I (16) recorded at each time interval;
the step S6 specifically comprises the following steps: from the readings of the pressure gauge I (16) recorded at each time interval, the permeability calculation is performed according to formula (1):
in the formula (1), P t For the reading of the pressure gauge I (16) at time t, v is the kinematic viscosity of the slurry injected by the grouting pipe I (1), g is the gravity acceleration, L is the length of a closed drill hole between the pressure-controlled setting device I (8) and the pressure-controlled setting device II (10), C is a constant related to the diameter of the test drill hole, the original pressure of the reservoir and the water content of the reservoir, K is the permeability coefficient of the reservoir of the coal rock mass, and the unit is mD, wherein 1 mD= 9.8697 ×10 -16 m 2 。
2. The in-situ test method for permeability of coal rock stratum according to claim 1, wherein the grouting pipe I (1) and the grouting pipe II (2) are multi-section grouting pipes, and the grouting pipes I (1) and II (2) are adjusted in length by adjusting the number of sections of the grouting pipes.
3. The in situ testing method of permeability of coal rock stratum according to claim 2, wherein each section of the multi-section grouting pipe is in threaded connection or plug connection.
4. The in situ coal formation permeability testing method according to claim 1, wherein the step S6 further comprises a step S7 of: and opening the pressure relief valve I (15) to relieve pressure, opening the pressure relief valve II (7) to relieve pressure, and taking out the coal stratum permeability in-situ test device.
5. The in situ coal formation permeability testing method of claim 1, wherein the first predetermined value is greater than 1.2 times the second predetermined value.
6. The in situ testing method of coal formation permeability according to claim 1, wherein the second predetermined value is less than a sum of a tensile strength of the coal formation and a ground stress at the measured point location.
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| CN110243746A (en) * | 2019-07-01 | 2019-09-17 | 重庆大学 | A kind of device and method of layer-through drilling quick in situ test coal seam permeability |
| CN110987754B (en) * | 2019-11-28 | 2022-03-18 | 山东科技大学 | In-situ measurement method for coal seam permeability |
| CN110879188B (en) * | 2019-11-28 | 2020-10-09 | 山东科技大学 | Movable rapid coal and rock permeability measuring instrument |
| CN113216940B (en) * | 2021-04-27 | 2022-04-15 | 中国平煤神马能源化工集团有限责任公司 | Multi-point rock stratum pore pressure testing method and system |
| CN113153274B (en) * | 2021-04-30 | 2022-09-09 | 中国矿业大学 | Deep coal seam in-situ gas content measuring method |
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