CN115492575A - Alkali liquor modification and strengthening pressure relief method for coal bed rock burst drilling - Google Patents
Alkali liquor modification and strengthening pressure relief method for coal bed rock burst drilling Download PDFInfo
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- CN115492575A CN115492575A CN202211140609.XA CN202211140609A CN115492575A CN 115492575 A CN115492575 A CN 115492575A CN 202211140609 A CN202211140609 A CN 202211140609A CN 115492575 A CN115492575 A CN 115492575A
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- 239000003245 coal Substances 0.000 title claims abstract description 98
- 238000005553 drilling Methods 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000011435 rock Substances 0.000 title claims abstract description 24
- 238000005728 strengthening Methods 0.000 title claims abstract description 16
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- 230000004048 modification Effects 0.000 title description 11
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- 229920001971 elastomer Polymers 0.000 claims description 14
- 238000002347 injection Methods 0.000 claims description 13
- 239000007924 injection Substances 0.000 claims description 13
- 239000000203 mixture Substances 0.000 claims description 5
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- 230000002708 enhancing effect Effects 0.000 claims 5
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- 230000015572 biosynthetic process Effects 0.000 abstract description 2
- 230000001737 promoting effect Effects 0.000 abstract description 2
- NIFIFKQPDTWWGU-UHFFFAOYSA-N pyrite Chemical compound [Fe+2].[S-][S-] NIFIFKQPDTWWGU-UHFFFAOYSA-N 0.000 description 5
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 4
- -1 form inorganic parts Inorganic materials 0.000 description 4
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 3
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 3
- 239000002734 clay mineral Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
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- 150000007524 organic acids Chemical class 0.000 description 2
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- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
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- 238000004458 analytical method Methods 0.000 description 1
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- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 229910052900 illite Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- VGIBGUSAECPPNB-UHFFFAOYSA-L nonaaluminum;magnesium;tripotassium;1,3-dioxido-2,4,5-trioxa-1,3-disilabicyclo[1.1.1]pentane;iron(2+);oxygen(2-);fluoride;hydroxide Chemical compound [OH-].[O-2].[O-2].[O-2].[O-2].[O-2].[F-].[Mg+2].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[K+].[K+].[K+].[Fe+2].O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2 VGIBGUSAECPPNB-UHFFFAOYSA-L 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000010412 perfusion Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 238000011197 physicochemical method Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 229910052952 pyrrhotite Inorganic materials 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
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- 239000011780 sodium chloride Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229910021653 sulphate ion Inorganic materials 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C41/00—Methods of underground or surface mining; Layouts therefor
- E21C41/16—Methods of underground mining; Layouts therefor
- E21C41/18—Methods of underground mining; Layouts therefor for brown or hard coal
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C37/00—Other methods or devices for dislodging with or without loading
- E21C37/16—Other methods or devices for dislodging with or without loading by fire-setting or by similar methods based on a heat effect
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Remote Sensing (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention relates to a method for modifying and strengthening pressure relief of a coal bed rock burst drilling alkali liquor, which is mainly used for injecting alkali liquor into holes in a coal wall. The invention is mainly characterized in that the formation of cracks is promoted, the integrity of the coal bed is destroyed, the mechanical property of the coal bed is weakened permanently, the impact tendency of the coal bed is reduced, and the invention also plays a role in promoting the crack expansion and strengthening the pressure relief effect by the neutralization reaction of the alkali liquor and the acidic substances in the coal bed.
Description
Technical Field
The invention belongs to the technical field of coal bed rock burst prevention and treatment, and particularly relates to a method for modifying and strengthening alkali liquor in a coal bed rock burst drilling hole for pressure relief.
Background
Coal is a main energy source in China, and has huge reserves, rock burst is one of the most serious dynamic disasters of coal mines under the current coal mining conditions, in order to prevent and treat rock burst, a large-diameter drilling pressure relief technology is fully applied to coal mines, the diameter of a general drilling hole is more than or equal to 150mm, the depth of the drilling hole is more than or equal to 15m, the distance between the drilling holes is 1-3 m, theoretically, effective pressure relief of a coal seam is a basic condition for preventing and treating rock burst, the large-diameter drilling pressure relief technology is considered as the most direct and effective method for relieving pressure of a coal body and transferring stress concentration, however, a large number of pressure relief drilling holes are constructed in a roadway of thousands of meters, a large amount of manpower, material resources and financial resources are consumed, meanwhile, geological coal seam conditions are complex and diverse, the mining technical conditions also have great influence on stress distribution, the pressure relief effect of the coal seam is not ideal, and the drilling pressure relief technology has great development and improvement space. Therefore, from the perspective of improving the pressure relief effect and reducing the labor, financial and time costs, according to the analysis of the existing research results, the physicochemical method is supposed to be used for modifying and relieving the pressure of the coal body material, and the alkali liquid pressure-maintaining perfusion strengthening method for the pressure relief effect of the coal bed rock burst drilling is provided due to the fact that the alkali property has a good matching degree in the coal bed modification.
The coal contains 14 kinds of macroelements, mainly C, H, O and N, which constitute the organic components of the coal, and S is not only the component of the organic substances in the coal, but also the important components of sulfate minerals and sulfides. Na, al, mg, ca, si, ti, K, fe and P mainly form inorganic parts, and minerals such as hydroxide, silicate, oxide, carbonate, sulfide, phosphate, sulfate and the like are main carriers: (1) si exists mainly in the form of quartz, clay minerals, silicates and aluminosilicates; (2) al exists mainly in the form of silicate and hydroxide; (3) fe: exists in sulfide (pyrite, marcasite, pyrrhotite, etc.), mainly contains pyrite, and partially also exists in the forms of carbonate mineral, hydroxide, oxide, sulfate, etc.; (4) mg is mainly carbonate and clay minerals; (5) na mainly exists in the forms of clay minerals, silicates and rock salt; (6) ca is present in coal mainly in carbonate (calcite), sulphate (gypsum), phosphate, silicate forms and organic states. (7) K exists in coal in the form of illite, feldspar and mica.
Except for main combustible organic coal matrix, the coal bed contains water and other impurity minerals, wherein sulfate minerals and sulfides account for large proportion, sulfate is strong acid and weak base salt, and H 2 The solution of S is weakly acidic, organic carboxylic acid in coal can also generate neutralization reaction in alkaline environment, and in addition, pyrite, marcasite and the like can generate a series of physicochemical and biochemical reactions in the mining process of medium-high sulfur coal seams to enable mine water to be acidic, and the phenomenon is shown in Shaan, jin, lu and Wan provincesThe main coal-producing provinces such as Mongolian, sichuan, gui and Gui are all widely existed. Therefore, the coal layer has an acidic environment in which a neutralization reaction can occur, and has a substance condition for neutralizing alkali.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the invention overcomes the defects of the prior art and provides a method for modifying and strengthening pressure relief of a coal bed rock burst drilling alkali liquor.
The technical scheme adopted by the invention for solving the problems in the prior art is as follows:
a method for modifying and strengthening the pressure relief of coal bed rock burst by drilling alkali liquor includes injecting alkali liquor into the holes on coal wall.
Preferably, pressure relief holes are drilled in the coal wall;
and filling alkali liquor into the pressure relief holes.
Preferably, the holes on the coal wall are sealed, and then alkali liquor is filled into the holes under the constant pressure.
Preferably, pressure relief holes are drilled in the coal wall;
the pressure relief hole is communicated with the alkali liquor supply device through a pipeline, and alkali liquor is filled into the pressure relief hole through the alkali liquor supply device.
Preferably, the alkali liquor supply device comprises an alkali liquor adding and mixing device and a high-pressure pump station which are connected in series, and an inlet and an outlet of the high-pressure pump station are respectively communicated with the alkali liquor adding and mixing device and the pressure relief hole.
And adding water and alkali liquor into the alkali liquor adding and mixing device, and filling the mixture into the pressure relief holes by a high-pressure pump station after mixing.
Preferably, a flow meter and a water pressure meter are arranged on a pipeline between the high-pressure pump station and the pressure relief hole.
Preferably, when the high-pressure pump station injects the alkali liquor into the pressure relief hole, the pressure value of the alkali liquor is observed through the water pressure gauge, and the pressure fluctuation range is kept to be less than 8%.
And (5) observing the numerical value of the flow meter, and closing the high-pressure pump station when the fluctuation range of the numerical value of the flow meter is less than 5%.
And modifying the coal bed by alkali liquor, continuously reducing the numerical value displayed by the hydraulic pressure meter, and detaching the pipeline between the high-pressure pump station and the pressure relief hole after the numerical value displayed by the hydraulic pressure meter is not changed for more than 120 h.
Preferably, a water injection end is arranged in the hole of the coal wall, and a capsule hole packer is arranged at the position, located on the outer side of the water injection end, in the hole.
The water injection end is connected with the alkali liquor supply device through a high-pressure pipe.
The capsule hole packer is connected with the capsule pump station through a high-pressure rubber pipe.
The alkali liquor supply device fills alkali liquor into the hole through the water injection end, the capsule pump station fills clear water into the capsule hole packer through the high-pressure rubber tube, and the water pressure pumped into the capsule hole packer is larger than or equal to the pressure of the alkali liquor filled into the hole.
Preferably, the alkali liquor supply device comprises an alkali liquor adding and mixing device and a high-pressure pump station which are connected in series, and an inlet and an outlet of the high-pressure pump station are respectively communicated with the alkali liquor adding and mixing device and the high-pressure pipe.
And adding water and alkali liquor into the alkali liquor adding and mixing device, and filling the mixture into the pressure relief holes by a high-pressure pump station after mixing.
Preferably, the high-pressure pipe and the high-pressure rubber pipe are both provided with a flowmeter and a water pressure meter.
When the high-pressure pipe is filled with the alkali liquor, the pressure value of the filled alkali liquor is observed through a water pressure meter on the high-pressure pipe, and the pressure fluctuation range is kept to be less than 8%.
And observing the numerical value of the flow meter on the high-pressure pipe, and closing the high-pressure pump station and the capsule pump station when the numerical value fluctuation range of the flow meter is less than 5%.
And modifying the coal bed by alkali liquor, continuously reducing the numerical value displayed by a hydraulic pressure meter on the high-pressure pipe, and detaching the high-pressure pipe and the high-pressure rubber pipe after the numerical value displayed by the hydraulic pressure meter is unchanged for more than or equal to 120 h.
Compared with the prior art, the invention has the following beneficial effects:
the method is mainly characterized in that alkali liquor is poured into the bottom of a pressure-relief drilling hole, or the alkali liquor is poured into the bottom of the hole after hole sealing by a hole sealing device for a certain time under pressure maintaining, so that acid substances in the coal bed are corroded by alkali, a neutralization reaction occurs, the formation of cracks is promoted, the integrity of the coal bed is damaged, the mechanical properties (uniaxial compressive strength, cohesion, friction angle and the like) of the coal bed are weakened permanently, the impact tendency (the indexes of the impact tendency of the weakened coal bed, namely the uniaxial compressive strength, the elastic energy index, the dynamic damage time and the impact energy index) of the coal bed is reduced, the aim of modifying the coal bed is fulfilled, the source substances of coal bed impact are eliminated, the function of promoting crack expansion is achieved, the range of a plastic ring is enlarged, and the pressure relief effect is strengthened. In addition, water serving as a pressure-maintaining pouring medium can enable the coal bed to absorb water to be saturated, mechanical properties are weakened, the impact tendency is reduced, and the purpose of modifying the coal bed and further strengthening the pressure relief effect is achieved.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a schematic diagram of the coal seam rock burst drilling alkali liquor modification and intensified pressure relief method.
In the figure: 1-water injection end, 2-capsule hole packer, 3-high pressure pipe, 4-flowmeter, 5-water pressure meter, 6-high pressure rubber pipe.
Detailed Description
As used in the specification and in the claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, that a person skilled in the art will be able to solve the technical problem within a certain error range, substantially to achieve the technical result.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "horizontal", and the like indicate orientations or positional relationships based on those shown in the drawings, only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the present invention, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.
The method for modifying and strengthening pressure relief of coal seam rock burst drilling alkali liquor is further described in detail below with reference to the accompanying drawings, but the method is not limited to the invention.
A method for modifying and strengthening pressure relief of coal bed rock burst by drilling alkali liquor is mainly characterized in that alkali liquor is injected into holes of a coal wall; or drilling pressure relief holes on the coal wall, and filling alkali liquor into the pressure relief holes.
The holes on the coal wall can be newly drilled pressure relief holes or waste drilled holes for gas extraction. No matter which kind of hole, all pour into hole bottom with alkali lye, modify the coal seam through alkali lye.
The path of modifying the coal bed by the alkali liquor is as follows:
(1) And (3) neutralization reaction: under alkaline conditions, organic acid and inorganic acid in the coal bed are subjected to neutralization reaction with alkali:
alkali + inorganic acid/organic acid (H) + ) → coal corrosion crack → alkalization modification to promote cracking
(2) Coal seam water absorption saturation: the coal bed is in a water-saturated state after absorbing water, the mechanical index is weakened, the impact tendency is reduced, and the aim of modifying the coal bed is fulfilled.
When the pressure relief drilling effect is poor and the pressure relief hole does not collapse, or when the pressure relief hole is drilled by adopting a small-diameter drilling hole to improve the construction efficiency, the method can effectively expand the plastic ring of the conventional pressure relief drilling hole, enlarge the pressure relief range, improve the pressure relief effect, modify the coal bed, reduce the impact tendency of the coal bed and strengthen the anti-impact effect.
Two examples are provided below for how the lye is poured into the bottom of the well:
example 1:
the pressure relief holes or other holes (such as waste gas extraction holes) are communicated with the alkali liquor supply device through pipelines, and alkali liquor is filled into the bottom of the holes through the alkali liquor supply device.
The alkali liquor supply device comprises an alkali liquor adding and mixing device and a high-pressure pump station which are connected in series, an inlet and an outlet of the high-pressure pump station are respectively connected with the alkali liquor adding and mixing device and a hole in a through mode, water and alkali liquor are added into the alkali liquor adding and mixing device, and after mixing, the high-pressure pump station is filled into the hole bottom.
And a flowmeter 4 and a water pressure meter 5 are arranged on a pipeline between the high-pressure pump station and the hole.
When the high-pressure pump station injects alkali liquor into the hole, the pressure value of the alkali liquor is observed through the water pressure meter 5, the pressure fluctuation range is kept to be less than 8%, and the optimal pressure is kept unchanged.
And observing the value of the flow meter 4, and preferably, closing the high-pressure pump station after the value of the flow meter 4 is stable when the fluctuation range of the value of the flow meter 4 is less than 5%.
And (5) withdrawing the equipment after the coal bed modification and pressure relief are finished. The completeness of coal bed modification can be judged by the numerical value of the water pressure meter 5.
Namely, when the coal bed is modified by the alkali liquor, the coal bed is corroded to generate cracks, and the alkali liquor can permeate into the cracks to further modify the coal bed contacted with the cracks. Therefore, the pressure of the alkali liquor in the hole is gradually reduced and reacts on the hydraulic pressure meter 5, and the value displayed by the hydraulic pressure meter 5 is continuously reduced. When the time length of the numerical value displayed by the hydraulic pressure meter 5 is not changed when the numerical value is more than or equal to 120h, or the numerical value displayed by the hydraulic pressure meter 5 is lower than a threshold value, the alkali liquor can be judged to finish the modification of the coal bed, and the pipeline between the high-pressure pump station and the hole is disassembled.
Example 2:
a water injection end 1 is arranged in a hole (containing a pressure relief hole) of the coal wall, and a capsule hole packer 2 is arranged at the position, located on the outer side of the water injection end 1, in the hole.
The water injection end 1 is connected with an alkali liquor supply device through a high-pressure pipe 3, the alkali liquor supply device comprises an alkali liquor adding and mixing device and a high-pressure pump station which are connected in series, and an inlet and an outlet of the high-pressure pump station are respectively communicated with the alkali liquor adding and mixing device and the high-pressure pipe 3. And adding water and alkali liquor into the alkali liquor adding and mixing device, and filling the mixture into the pressure relief holes by a high-pressure pump station after mixing.
The capsule hole packer 2 is connected with a capsule pump station through a high-pressure rubber pipe 6.
The alkali liquor supply device fills alkali liquor into the hole through the water injection end 1, the capsule pump station fills clear water into the capsule hole packer 2 through the high-pressure rubber pipe 6, and the water pressure pumped into the capsule hole packer 2 is larger than or equal to the pressure of the alkali liquor filled into the hole.
The high-pressure pipe 3 and the high-pressure rubber pipe 6 are both provided with a flowmeter 4 and a water pressure meter 5.
When the high-pressure pipe 3 is filled with the alkali liquor, the pressure value of the filled alkali liquor is observed through the water pressure meter 5 on the high-pressure pipe 3, the pressure fluctuation range is kept to be smaller than 8%, and the pressure inside the high-pressure pipe 3 and the high-pressure rubber pipe 6 is preferably kept unchanged.
And observing the numerical value of the flow meter 4 on the high-pressure pipe 3, and preferably closing the high-pressure pump station and the capsule pump station after the numerical value of the flow meter 4 is stable when the numerical value fluctuation range of the flow meter 4 is less than 5%.
The above-mentioned fluctuation ranges of the pressure and flow rate values refer to the comparison between the values measured by the water pressure meter 5 and the flow meter 4 at two points in time before and after the predetermined period of time. The time period is 5min-30min.
And (5) withdrawing the equipment after the coal bed modification and pressure relief are finished. The completeness of coal bed modification can be judged through the value of the water pressure gauge 5 on the high-pressure pipe 3.
Namely, when the coal seam is modified by the alkali liquor, the coal seam is corroded to generate cracks, and the alkali liquor can penetrate into the cracks to further modify the coal seam contacted with the cracks. Therefore, the pressure of the alkali liquor in the hole is gradually reduced and is reflected to the water pressure meter 5 on the high-pressure pipe 3, and the value displayed by the water pressure meter 5 is continuously reduced. When the time length of the numerical value displayed by the hydraulic pressure meter 5 is not changed when the numerical value is more than or equal to 120h, or the numerical value displayed by the hydraulic pressure meter 5 is lower than a threshold value, the alkali liquor can be judged to finish modifying the coal bed, and the high-pressure pipe 3 and the high-pressure rubber pipe 6 are disassembled.
And the double modification of the physical and chemical properties of the coal bed can be realized by pressurizing and filling the alkali liquor, and the elimination of an impact source is greatly promoted. The alkali liquor can corrode the impurity minerals of the coal body, promote the generation, the spreading and the expansion of cracks, better relieve the pressure of the coal bed, promote the stress transfer and ensure that the pressure relief range is wider and more uniform.
The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.
Claims (10)
1. The method for modifying and strengthening pressure relief of the alkali liquor in coal bed rock burst drilling is characterized by comprising the following steps:
and injecting alkali liquor into the holes of the coal wall.
2. The method for modifying and enhancing pressure relief of coal seam rock burst borehole alkali liquor according to claim 1, wherein:
drilling a pressure relief hole on the coal wall;
and filling alkali liquor into the pressure relief holes.
3. The method for modifying and enhancing pressure relief of coal seam rock burst borehole alkali liquor according to claim 1, wherein:
and sealing holes on the coal wall, and then filling alkali liquor into the holes under the constant pressure.
4. The method for modifying and strengthening pressure relief of coal seam rock burst borehole alkali liquor according to claim 2, characterized by comprising the following steps:
drilling a pressure relief hole on the coal wall;
the pressure relief hole is communicated with the alkali liquor supply device through a pipeline, and alkali liquor is filled into the pressure relief hole through the alkali liquor supply device.
5. The method for modifying and strengthening pressure relief of coal seam rock burst borehole alkali liquor according to claim 4, wherein:
the alkali liquor supply device comprises an alkali liquor adding and mixing device and a high-pressure pump station which are connected in series, an inlet and an outlet of the high-pressure pump station are respectively communicated with the alkali liquor adding and mixing device and the pressure relief hole,
and adding water and alkali liquor into the alkali liquor adding and mixing device, and after mixing, pouring the mixture into the pressure relief holes by a high-pressure pump station.
6. The method for modifying and enhancing pressure relief of coal seam rock burst borehole alkali liquor according to claim 4 or 5, wherein:
and a flowmeter (4) and a water pressure meter (5) are arranged on a pipeline between the high-pressure pump station and the pressure relief hole.
7. The method for modifying and enhancing pressure relief of coal seam rock burst borehole alkali liquor according to claim 6, wherein:
when the high-pressure pump station injects alkali liquor into the pressure relief hole, the pressure value of the alkali liquor is observed through the water pressure meter (5), the pressure fluctuation range is kept less than 8 percent,
observing the value of the flowmeter (4), closing the high-pressure pump station when the fluctuation range of the value of the flowmeter (4) is less than 5 percent,
and (3) modifying the coal bed by alkali liquor, continuously reducing the numerical value displayed by the water pressure meter (5), and disassembling a pipeline between the high-pressure pump station and the pressure relief hole when the time length of the numerical value displayed by the water pressure meter (5) is not changed when the numerical value is more than or equal to 120 hours.
8. The method for modifying and enhancing pressure relief of coal seam rock burst borehole alkali liquor according to claim 3, wherein:
a water injection end head (1) is arranged in a hole of the coal wall, a capsule hole packer (2) is arranged in the hole at the position outside the water injection end head (1),
the water injection end (1) is connected with an alkali liquor supply device through a high-pressure pipe (3),
the capsule hole packer (2) is connected with a capsule pump station through a high-pressure rubber pipe (6),
the alkali liquor supply device fills alkali liquor into the hole through the water injection end head (1), the capsule pump station fills clear water into the capsule hole sealing device (2) through the high-pressure rubber pipe (6), and the water pressure pumped into the capsule hole sealing device (2) is larger than or equal to the pressure of the alkali liquor filled into the hole.
9. The method for modifying and strengthening pressure relief of coal seam rock burst borehole alkali liquor according to claim 8, wherein:
the alkali liquor supply device comprises an alkali liquor adding and mixing device and a high-pressure pump station which are connected in series, an inlet and an outlet of the high-pressure pump station are respectively communicated with the alkali liquor adding and mixing device and the high-pressure pipe (3),
and adding water and alkali liquor into the alkali liquor adding and mixing device, and filling the mixture into the pressure relief holes by a high-pressure pump station after mixing.
10. The method for modifying and strengthening pressure relief of coal seam rock burst borehole alkali liquor according to claim 8 or 9, characterized by comprising the following steps:
the high-pressure pipe (3) and the high-pressure rubber pipe (6) are both provided with a flowmeter (4) and a water pressure meter (5),
when the high-pressure pipe (3) is filled with alkali liquor, the pressure value of the filled alkali liquor is observed through the water pressure meter (5) on the high-pressure pipe (3), the pressure fluctuation range is kept to be less than 8 percent,
observing the numerical value of the flowmeter (4) on the high-pressure pipe (3), closing the high-pressure pump station and the capsule pump station when the numerical value fluctuation range of the flowmeter (4) is less than 5 percent,
and (2) modifying the coal bed by alkali liquor, continuously reducing the numerical value displayed by the water pressure meter (5) on the high-pressure pipe (3), and disassembling the high-pressure pipe (3) and the high-pressure rubber pipe (6) when the numerical value displayed by the water pressure meter (5) is unchanged for more than or equal to 120 hours.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115355004A (en) * | 2022-09-20 | 2022-11-18 | 山东理工大学 | Method for modifying and strengthening pressure relief of red mud slurry for coal bed rock burst drilling |
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| CN103061766A (en) * | 2013-01-11 | 2013-04-24 | 河南理工大学 | Method for preventing and controlling coalbed rockburst through chemical reaction |
| CN104110270A (en) * | 2014-07-07 | 2014-10-22 | 辽宁工程技术大学 | Method for controlling coal bed sulfuretted hydrogen in dynamic alkali injection mode |
| CN114320292A (en) * | 2022-01-07 | 2022-04-12 | 辽宁工程技术大学 | Coal seam rock burst prevention and control method based on solution modification effect |
| CN115522975A (en) * | 2022-09-20 | 2022-12-27 | 山东理工大学 | Method for preventing and treating coal bed alkali liquor modification and fracturing pressure relief rock burst |
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| CN103061766A (en) * | 2013-01-11 | 2013-04-24 | 河南理工大学 | Method for preventing and controlling coalbed rockburst through chemical reaction |
| CN104110270A (en) * | 2014-07-07 | 2014-10-22 | 辽宁工程技术大学 | Method for controlling coal bed sulfuretted hydrogen in dynamic alkali injection mode |
| CN114320292A (en) * | 2022-01-07 | 2022-04-12 | 辽宁工程技术大学 | Coal seam rock burst prevention and control method based on solution modification effect |
| CN115522975A (en) * | 2022-09-20 | 2022-12-27 | 山东理工大学 | Method for preventing and treating coal bed alkali liquor modification and fracturing pressure relief rock burst |
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| CN115355004A (en) * | 2022-09-20 | 2022-11-18 | 山东理工大学 | Method for modifying and strengthening pressure relief of red mud slurry for coal bed rock burst drilling |
| CN115355004B (en) * | 2022-09-20 | 2024-03-19 | 山东理工大学 | Modification and reinforcement pressure relief method for red mud slurry for rock burst drilling of coal seam |
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