CN110513100B - On-site experiment method for improving gas pressure measurement success rate - Google Patents
On-site experiment method for improving gas pressure measurement success rate Download PDFInfo
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- CN110513100B CN110513100B CN201910860374.3A CN201910860374A CN110513100B CN 110513100 B CN110513100 B CN 110513100B CN 201910860374 A CN201910860374 A CN 201910860374A CN 110513100 B CN110513100 B CN 110513100B
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- 238000000034 method Methods 0.000 title claims abstract description 48
- 238000009530 blood pressure measurement Methods 0.000 title claims abstract description 22
- 238000002474 experimental method Methods 0.000 title claims abstract description 18
- 239000003245 coal Substances 0.000 claims abstract description 53
- 239000011435 rock Substances 0.000 claims abstract description 16
- 239000002002 slurry Substances 0.000 claims description 27
- 238000005553 drilling Methods 0.000 claims description 20
- 239000000463 material Substances 0.000 claims description 10
- 238000007789 sealing Methods 0.000 claims description 9
- 239000011440 grout Substances 0.000 claims description 7
- 239000004568 cement Substances 0.000 claims description 6
- 239000010881 fly ash Substances 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
- 230000002787 reinforcement Effects 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000002817 coal dust Substances 0.000 claims description 3
- 238000007667 floating Methods 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000005452 bending Methods 0.000 claims description 2
- 238000005336 cracking Methods 0.000 claims description 2
- 238000009792 diffusion process Methods 0.000 claims description 2
- 238000000605 extraction Methods 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 4
- 230000003014 reinforcing effect Effects 0.000 abstract description 3
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 239000007788 liquid Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002775 capsule Substances 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000013433 optimization analysis Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- 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
- 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
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- 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
- E21B47/00—Survey of boreholes or wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The invention relates to an on-site experiment method for improving the success rate of gas pressure measurement, wherein the gas pressure of a soft and broken coal seam adopts a double-hole pressure measurement mode, the on-site experiment method comprises three procedures of measuring a loose circle of surrounding rock of a soft and broken coal seam roadway, reinforcing the surrounding rock of the coal seam roadway by echelon grouting, and measuring the gas pressure of an active coal seam on site by an active coal seam gas pressure measuring instrument, wherein the three procedures are sequentially carried out, so that the gas tightness in the gas pressure measuring process is ensured, and the accurate and efficient measurement of the gas pressure of the soft coal seam is realized. The on-site experiment method can improve the success rate of measuring the gas pressure of the soft and broken coal seam, improve the effect of measuring the gas pressure, and further provide reliable basis for optimizing the gas drainage technological parameters of the soft and broken coal seam. The field experiment method has simple procedure, convenient operation, low cost and high success rate.
Description
Technical Field
The invention belongs to the technical field of coal mine safety measurement, relates to measurement of gas pressure of a soft and broken coal seam under a coal mine, and particularly relates to a field experiment method for improving the success rate of gas pressure measurement.
Background
In recent ten years, a great deal of research on coal bed gas parameters (such as gas pressure, gas content and gas permeability), especially on the aspect of gas pressure measurement, has been carried out at home and abroad. The gas pressure is a core parameter for prediction and prevention of gas dynamic disasters, and currently, a direct measurement method is mainly adopted in the aspect of gas pressure measurement, and the gas pressure measurement is generally divided into a passive method and an active method according to different hole sealing principles. The passive hole sealing determination method adopts yellow mud, cement mortar, rubber rings, capsules and the like to perform hole sealing determination, and because the method lacks the plugging capability on micro cracks around a drill hole, gas leakage is easy to occur, and the measured gas pressure value is low. The active hole sealing pressure measuring method is proposed by Zhou Shining academy and the like in the 80 s of the 20 th century, the basic principle of the method is to seal liquid by using solid and seal gas by using liquid, and the pressure of hole sealing liquid is always higher than the gas pressure, so that the method is called as an effective method for accurately measuring the gas pressure of a coal seam.
The various coal bed gas pressure technologies play a powerful technical support for ensuring the safe production of coal mines, but various current testing technologies in production practice have different defects and limitations, for example, the gas pressure is more accurately and reliably measured in a rock roadway under general conditions, but the more accurate and reliable data is often difficult to measure by adopting the same technical scheme in a coal roadway, particularly a soft and broken coal bed.
The method solves the problem of on-site measurement of the gas pressure of the soft and broken coal body, so that the success rate of the gas pressure measurement of the soft and broken coal bed can be improved, the effect of the gas pressure measurement is improved, the reliable basis can be provided for optimizing the technological parameters of the gas drainage of the soft and broken coal bed, and the method has important significance for safe production and gas drainage of mines.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a method for measuring the gas pressure of soft fractured coal seams, which has simple procedures, low cost and easy operation. The field experiment method can realize accurate and efficient measurement of the gas pressure of the coal bed by adopting a double-hole pressure measurement mode of blocking cracks and reinforcing surrounding rocks by adopting echelon grouting in the measurement range of the gas pressure of the soft and broken coal bed under the condition of the soft and broken coal bed.
In order to achieve the purpose, the invention adopts the following technical scheme that the field experiment method for improving the gas pressure measurement success rate is carried out according to the following steps:
drilling: drilling two measuring holes and two grouting holes with the diameter of 75-93mm and the hole pitch of 2.5-3.5m in a coal seam within a pressure measuring range;
c, pipe column descending: inserting a slurry return pipe with the length of one half of the depth of the measuring hole and a slurry injection pipe with the length of three tenths of the depth of the slurry injection hole into the measuring hole and the slurry injection hole respectively, and sealing the slurry return pipe and the slurry injection pipe;
grouting material blending: fully mixing cement and fly ash according to a ratio of 3;
grouting: injecting the uniformly stirred grouting material into the grouting pipe through a grouting pump, temporarily stopping grouting when slurry flows out of the slurry return pipe, bending the outer end of the slurry return pipe, fastening the outer end by using a steel wire, and then continuing grouting;
and (3) grouting: when slurry overflows from the coal wall of the measuring yard in the grouting process, suspending grouting, continuing grouting after 30min intervals, and stopping grouting until the grouting pressure reaches 2-3 MPa;
and (3) gas pressure measurement: and after the grouting reinforcement is finished for 24H, the active coal seam gas pressure is measured in the measuring hole.
Also includes the preparation work: and (4) conveying grouting materials, grouting equipment and drilling equipment used for grouting to the selected measuring point position according to requirements, and then drilling.
And when drilling, the depth of the measuring hole and the grouting hole is 10m, and after drilling is finished, the floating coal dust is blown clean by compressed air.
Before grouting, measuring the surrounding rock loosening zone of the coal seam roadway, and measuring the cracking depth of the soft cracked coal seam roadway side by using a surrounding rock loosening zone tester.
And after grouting is completed for 1h, the external grouting pipe and equipment are dismantled.
The invention has the beneficial effects that: the gas tightness in the gas pressure measuring process is ensured by sealing and blocking the fracture and strengthening the surrounding rock through gradient grouting of the surrounding rock of the soft coal seam roadway, and the accurate and efficient measurement of the gas pressure of the soft coal seam is realized. The on-site experiment method can improve the success rate of measuring the gas pressure of the soft and broken coal seam, improve the effect of measuring the gas pressure, and further provide reliable basis for optimizing the gas drainage technological parameters of the soft and broken coal seam. The field experiment method has the advantages of simple procedure, convenient operation, low cost and high success rate.
Drawings
FIG. 1 is a schematic view of a survey and grout hole drilling arrangement of the present invention;
FIG. 2 is a plan view showing the arrangement of a grouting pipe and a slurry return pipe in the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and examples.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; in the description of the present invention, "a plurality" means two or more unless otherwise specified.
Examples
The field experiment method for improving the success rate of gas pressure measurement as shown in fig. 1 and fig. 2 is performed according to the following steps:
preparing before grouting, namely transporting grouting materials (cement and fly ash), drilling equipment, grouting equipment (the grouting equipment used in the embodiment is a 2ZBQ-50/2 synchronous pneumatic grouting pump) and a pipeline to a point needing to be measured, and then installing the equipment;
drilling: after the equipment is installed, selecting the positions of a measuring hole and a drilling hole of a grouting hole, and ensuring that the pitch between the grouting hole and the measuring hole is 2.5m-3.5m, wherein after the position of the drilling hole is selected with the pitch of 2.5m, drilling two measuring holes and two grouting holes with the diameters of 75-93mm in a coal bed within a pressure measuring range through drilling equipment; in the embodiment, the aperture selection of the measuring hole and the grouting hole is consistent with that of the gas pressure side hole, the value is 75mm, the depth of the drilled hole is 10m, and the use of multiple sets of drill bits and drill rods in the field actual measurement process is avoided;
after the drilling is completed, the floating coal dust is blown clean by compressed air.
A pipe column is lowered: inserting a slurry return pipe with the length being one half of the depth of the measuring hole and a grouting pipe with the length being three tenths of the depth of the grouting hole into the measuring hole and the grouting hole respectively, and sealing the slurry return pipe and the grouting pipe; the length of the grout pipe adopted in the embodiment is 5m, the length of the grouting pipe is 3m, the grouting pipe and the grout pipe are respectively inserted into the grouting hole and the measuring hole, and then the grouting pipe and the grout pipe are timely sealed and fixedly connected with the grouting hole and the measuring hole by adopting commonly-used expansion cement in a driving roadway.
Grouting material blending: debugging grouting equipment by a project member, preparing grouting materials according to the result of grouting parameter optimization analysis, respectively placing two main materials, namely cement and fly ash, into two slurry barrels according to the proportion of 3;
determining a surrounding rock loosening circle of the coal seam roadway, determining the breaking depth of the side part of the soft broken coal seam roadway by using a surrounding rock loosening circle tester, and specifically determining the breaking depth of the side part of the soft broken coal seam roadway by using a BA-II type surrounding rock loosening circle tester;
grouting: after the grouting slurry is mixed and evenly stirred, two slurry suction pipes of a grouting pump are placed into a slurry barrel, the proportioning requirement of cement and fly ash is met through flow control, when slurry flows out of a slurry return pipe, grouting is stopped temporarily, the outer end of the slurry return pipe is bent and fastened by a steel wire, and then grouting is continued; in the grouting process, the grouting pressure P is 2-3MPa, so that the gas extraction influence radius of which the diffusion radius of the main section of the slurry reaches more than 2 times under the condition of adopting echelon grouting is ensured;
and (3) grouting: when slurry overflows from the coal wall of the measuring field in the grouting process, the grouting is suspended, the grouting is continued after 30min intervals, and the grouting is stopped until the grouting pressure reaches 2.8 MPa;
in order to prevent the grout which is not initially set from being sprayed out, the external grouting pipe is forbidden to be removed immediately after the grouting is stopped, and the external grouting pipe and the equipment are removed after the grouting is stabilized for 1h
And (3) gas pressure measurement: and after the grouting reinforcement is completed for 24H, the active coal bed gas pressure is measured in the measuring hole.
Specifically, when the gas is measured on the soft and broken coal, the three steps of loose loop measurement, echelon grouting reinforcement and gas pressure measurement are carried out one by one in sequence and cannot be crossed; exceeding 24h after the echelon grouting reinforcement process is finished, and carrying out active coal seam gas pressure measurement
The method adopts a double-hole pressure measurement mode, the field experiment method comprises three procedures of measuring the loose circle of the surrounding rock of the soft fractured coal seam roadway, reinforcing the surrounding rock of the coal seam roadway by echelon grouting, and measuring the gas pressure of the active coal seam on the field, wherein the three procedures are sequentially carried out, and the surrounding rock of the soft coal seam roadway is blocked and the fractured crack is strengthened by echelon grouting, so that the gas tightness in the gas pressure measurement process is ensured, and the accurate and efficient measurement of the gas pressure of the soft coal seam is realized. The on-site experiment method can improve the success rate of measuring the gas pressure of the soft and broken coal seam, improve the effect of measuring the gas pressure, and further provide reliable basis for optimizing the gas drainage technological parameters of the soft and broken coal seam. The field experiment method has simple procedure, convenient operation, low cost and high success rate.
The above embodiments are merely illustrative of the present invention, and do not limit the scope of the present invention, and all designs identical or similar to the present invention are within the scope of the present invention.
Claims (3)
1. A field experiment method for improving the success rate of gas pressure measurement is characterized by comprising the following steps:
drilling: drilling two measuring holes and two grouting holes with the diameter of 75-93mm and the hole pitch of 2.5-3.5m in a coal seam within a pressure measuring range;
c, pipe column descending: inserting a grout return pipe with the length being one half of the depth of the measuring hole into the measuring hole, inserting a grouting pipe with the length being three tenths of the depth of the grouting hole into the grouting hole, and respectively sealing the inserted grout return pipe and the inserted grouting pipe;
grouting material blending: fully mixing cement and fly ash according to a ratio of 3;
grouting: injecting the uniformly stirred grouting material into the grouting pipe through a grouting pump, temporarily stopping grouting when slurry flows out of the slurry return pipe, bending the outer end of the slurry return pipe, fastening the outer end by using a steel wire, and then continuing grouting; in the grouting process, the grouting pressure P is 2-3MPa, so that the gas extraction influence radius of which the diffusion radius of the main section of the slurry reaches more than 2 times under the condition of adopting echelon grouting is ensured;
and (3) grouting: when slurry overflows from the coal wall of the measuring yard in the grouting process, suspending grouting, continuing grouting after 30min intervals, and stopping grouting until the grouting pressure reaches 2-3 MPa;
and (3) measuring the gas pressure: after the grouting reinforcement is completed for 24H, the active coal bed gas pressure is measured in the measuring hole;
during drilling, the depth of the measuring hole and the grouting hole is 10m, and after drilling is finished, floating coal dust is blown clean by compressed air;
before grouting, measuring the surrounding rock loosening zone of the coal seam roadway, and measuring the cracking depth of the soft cracked coal seam roadway side by using a surrounding rock loosening zone tester.
2. The field experiment method for improving the success rate of gas pressure measurement according to claim 1, further comprising the following steps: and (4) transporting grouting materials, grouting equipment and drilling equipment used for grouting to the selected measuring point position according to requirements, and then drilling.
3. The field experiment method for improving the success rate of gas pressure measurement according to claim 1, wherein the external grouting pipe and equipment are removed after grouting is completed for 1 h.
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