CN114135249A - Reusable and automatic pressure supplementing gas extraction drilling and sealing system and working method thereof - Google Patents
Reusable and automatic pressure supplementing gas extraction drilling and sealing system and working method thereof Download PDFInfo
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- CN114135249A CN114135249A CN202111468824.8A CN202111468824A CN114135249A CN 114135249 A CN114135249 A CN 114135249A CN 202111468824 A CN202111468824 A CN 202111468824A CN 114135249 A CN114135249 A CN 114135249A
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- 238000007789 sealing Methods 0.000 title claims abstract description 250
- 238000000605 extraction Methods 0.000 title claims abstract description 101
- 238000005553 drilling Methods 0.000 title claims abstract description 46
- 230000001502 supplementing effect Effects 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims description 40
- 239000002002 slurry Substances 0.000 claims abstract description 57
- 238000011084 recovery Methods 0.000 claims abstract description 47
- 239000007788 liquid Substances 0.000 claims abstract description 29
- 238000003860 storage Methods 0.000 claims abstract description 27
- 239000003245 coal Substances 0.000 claims description 35
- 230000003014 reinforcing effect Effects 0.000 claims description 26
- 239000011435 rock Substances 0.000 claims description 24
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 22
- 230000008569 process Effects 0.000 claims description 17
- ZRALSGWEFCBTJO-UHFFFAOYSA-N Guanidine Chemical compound NC(N)=N ZRALSGWEFCBTJO-UHFFFAOYSA-N 0.000 claims description 16
- 238000007569 slipcasting Methods 0.000 claims description 15
- 239000004744 fabric Substances 0.000 claims description 10
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims description 8
- CHJJGSNFBQVOTG-UHFFFAOYSA-N N-methyl-guanidine Natural products CNC(N)=N CHJJGSNFBQVOTG-UHFFFAOYSA-N 0.000 claims description 8
- SWSQBOPZIKWTGO-UHFFFAOYSA-N dimethylaminoamidine Natural products CN(C)C(N)=N SWSQBOPZIKWTGO-UHFFFAOYSA-N 0.000 claims description 8
- 238000013461 design Methods 0.000 claims description 6
- 238000011161 development Methods 0.000 claims description 6
- 230000018109 developmental process Effects 0.000 claims description 6
- 238000005065 mining Methods 0.000 claims description 6
- 238000002347 injection Methods 0.000 claims description 5
- 239000007924 injection Substances 0.000 claims description 5
- 239000000284 extract Substances 0.000 claims description 4
- 238000002360 preparation method Methods 0.000 claims description 4
- 238000009933 burial Methods 0.000 claims description 3
- 238000004880 explosion Methods 0.000 claims description 3
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- 238000012423 maintenance Methods 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 238000004064 recycling Methods 0.000 claims description 3
- 230000017260 vegetative to reproductive phase transition of meristem Effects 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- 230000009471 action Effects 0.000 claims description 2
- 235000013399 edible fruits Nutrition 0.000 claims 1
- 238000005098 hot rolling Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 11
- 235000011187 glycerol Nutrition 0.000 description 7
- 208000010392 Bone Fractures Diseases 0.000 description 5
- 206010017076 Fracture Diseases 0.000 description 5
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- 238000004519 manufacturing process Methods 0.000 description 3
- 239000003566 sealing material Substances 0.000 description 3
- 230000008093 supporting effect Effects 0.000 description 3
- 239000012530 fluid Substances 0.000 description 2
- 239000011440 grout Substances 0.000 description 2
- 238000001802 infusion Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
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- 229920000742 Cotton Polymers 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000005422 blasting 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
- E21B33/138—Plastering the borehole wall; Injecting into the formation
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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
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
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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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/006—Production of coal-bed methane
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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
- E21B44/00—Automatic control systems specially adapted for drilling operations, i.e. self-operating systems which function to carry out or modify a drilling operation without intervention of a human operator, e.g. computer-controlled drilling systems; Systems specially adapted for monitoring a plurality of drilling variables or conditions
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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
- E21B47/06—Measuring temperature or pressure
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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
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
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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
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/18—Special adaptations of signalling or alarm devices
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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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Abstract
The reusable automatic pressure supplementing gas extraction drilling and sealing system comprises a liquid storage tank, a hole sealing and grouting pump assembly, a bag type hole sealing device, a negative pressure recovery pump assembly and a PLC automatic control system, wherein the bag type hole sealing device is installed outside a gas extraction pipe and extends into a drill hole, an inlet of the hole sealing and grouting pump assembly is connected with an outlet of the liquid storage tank, a grouting pipe and a recovery pipe penetrate through the bag type hole sealing device, an outlet of the hole sealing and grouting pump assembly is connected with a left port of the grouting pipe, an inlet of the negative pressure recovery pump assembly is connected with a left port of the recovery pipe, and an outlet of the negative pressure recovery pump assembly is connected with an inlet at the top of the liquid storage tank through a filter; the PLC automatic control system comprises a PLC controller, an electromagnetic valve, a pressure gauge and a pressure sensor. The invention realizes repeated grouting and pressure supplementing, repeated use of slurry and hole sealing devices, solves the problems of low gas extraction concentration, quick attenuation and poor extraction effect, improves the extraction efficiency of the drilled hole, and realizes intelligent and automatic drilling and hole sealing.
Description
Technical Field
The invention belongs to the technical field of underground gas prevention and control, and particularly relates to a reusable and automatic pressure supplementing gas extraction drilling and sealing system and a working method thereof.
Background
China is one of the most serious countries of coal mine gas disasters in the world, and the gas disasters affect the safe production of mines. At present, the most effective measure for reducing gas accidents and realizing the co-mining of coal and gas is to extract the gas in the coal seam of a mine. The quality of the hole sealing quality of the gas extraction drill hole directly influences the gas extraction effect of the coal seam. The main hole sealing processes of coal mine extraction drill holes in China at the present stage include cement slurry hole sealing, high polymer foam material hole sealing, bag type hole sealing device hole sealing, secondary hole sealing method hole sealing, double-plugging and one-injection pressurized hole sealing and the like.
The cement slurry hole sealing process has the advantages of low cost and convenient operation, and has the defects that the cement is easy to shrink after being solidified to cause air leakage, and the slurry cannot go deep into the cracks of the drilled holes to be sealed, so that the drilled holes can be leaked with air; the hole sealing of the high-molecular foamed polymer material has the advantages of short hole sealing time, high foaming times and the like, but the compression resistance of the foamed material is limited, and the foamed material is easy to deform under the conditions of high ground stress or mining interference, so that cracks are generated around a drilled hole in a hole sealing section, and the extraction effect is influenced; the bag-type hole sealing device has the characteristic of high hole sealing speed, but has low repeated utilization rate and high requirement on operators, and the hole sealing quality cannot be ensured; the secondary hole sealing method hole sealing process mainly adopts the method that after primary hole sealing, the micro expansion powder is blown into the drainage drill hole under pressure to achieve the effects of sealing the peripheral cracks of the drill hole and improving the extraction rate, and the defects that the micro expansion powder is easy to damp and agglomerate to influence the crack sealing.
The method has wide application and better extraction effect, namely ' two-plugging one-injection ' hole sealing with pressure ', and the ' two-plugging one-injection ' hole sealing with pressure can ensure that hole sealing materials (slurry) can well penetrate into peripheral cracks of the drill hole, effectively block a gas leakage channel and improve the sealing property. The existing problems are that the strength of two plugs is low, so that the grouting pressure is not high or is not high, the cracks around a drill hole cannot be tightly plugged, the purpose of one-plug cannot be achieved, and the extraction effect is poor. As the hole sealing pressure is reduced along with the lapse of time, the hole sealing material commonly adopted in the past can not realize the secondary slip casting and mend the pressure, and the hole sealing material can not be retrieved and used circularly after using.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides the reusable automatic pressure supplementing gas extraction drilling and sealing system which is convenient to operate, safe, reliable and high in construction efficiency and the working method thereof.
In order to solve the technical problems, the invention adopts the following technical scheme: the reusable automatic pressure supplementing gas extraction drilling and sealing system comprises a liquid storage tank, a hole sealing and grouting pump assembly, a bag type hole sealing device, a negative pressure recovery pump assembly and a PLC automatic control system, wherein the bag type hole sealing device is installed outside a gas extraction pipe and extends into a drill hole, the direction of the drill hole from an orifice to the bottom of the hole is from left to right, slurry is stored in the liquid storage tank, an inlet of the hole sealing and grouting pump assembly is connected with an outlet of the liquid storage tank, a grouting pipe and a recovery pipe penetrate through the bag type hole sealing device, an outlet of the hole sealing and grouting pump assembly is connected with a left port of the grouting pipe, an inlet of the negative pressure recovery pump assembly is connected with a left port of the recovery pipe, and an outlet of the negative pressure recovery pump assembly is connected with an inlet at the top of the liquid storage tank through a filter; the PLC automatic control system comprises a PLC controller, an electromagnetic valve, a pressure gauge and a pressure sensor, the electromagnetic valve and the pressure gauge are installed on the grouting pipe, the pressure sensor is connected between the output end of the pressure gauge and the input end of the PLC controller, and the output end of the PLC controller is connected with the input end of the electromagnetic valve and the input end of the hole sealing grouting pump assembly respectively.
The bag type hole sealing device comprises a left bag and a right bag which are coaxially arranged on the gas extraction pipe, the shapes of the left bag and the right bag are cylindrical, and cylindrical holes sleeved on the excircle of the gas extraction pipe are formed in the centers of the left bag and the right bag;
drilling forms the sealed section of slip casting between left bag and right bag, and the slip casting pipe stretches into right bag inside after passing left bag, the sealed section of slip casting in proper order from the left side to the right side, all is equipped with the check valve in left bag and right bag inside on the slip casting pipe, is equipped with the blast valve in the sealed section of slip casting inside on the slip casting pipe.
The outer circles of the left bag and the right bag are provided with annular sealing reinforcing structures; the annular sealing reinforcing structure comprises a plurality of sealing convex edge strips which are all in a circular ring shape, all the sealing convex edge strips are arranged at intervals along the direction of the central line of the bag, the cross section of each sealing convex edge strip is in a semicircular structure, and the sealing convex edge strips and the bag are manufactured into an integral structure; the excircle covers of left bag and right bag are equipped with wear-resisting elastic cloth cover.
End face reinforcing structures are arranged on the left end plane and the right end plane of the left bag and the right bag; the end face reinforcing structure comprises a plurality of convex rib reinforcing strips, all the convex rib reinforcing strips are uniformly arranged along the circumferential direction of the end face of the bag, each convex rib reinforcing strip is arranged along the radial direction of the bag, and the convex rib reinforcing strips and the bag are made into an integral structure.
And a manual ball valve is arranged outside the hole opening of the drilling hole on the recovery pipe, and the recovery openings are respectively communicated with the insides of the left bag, the grouting sealing section and the right bag on the recovery pipe.
The working method of the reusable and automatic pressure supplementing gas extraction drilling and sealing system sequentially comprises the following steps:
(1) judging and recognizing the geological features of coal seam gas extraction;
(2) installing and debugging a reusable and automatic pressure supplementing gas extraction drilling and sealing system;
(3) the hole sealing operation is carried out by manually controlling the reusable automatic pressure supplementing gas extraction drilling and hole sealing system of the drill hole;
(4) in the gas extraction process, the reusable automatic pressure supplementing gas extraction drilling and sealing system carries out automatic sealing operation;
(5) and after the gas extraction of the working surface is finished, recovering reusable slurry and equipment of the automatic pressure supplementing gas extraction drilling and hole sealing system.
The specific contents of the coal bed gas extraction geological feature judgment in the step (1) are as follows:
judging and recognizing the geological conditions of the gas according to the related indexes of the gas content, the gas pressure, the stability of surrounding rocks, the integrity of the drill hole and the ground stress of the coal seam, analyzing the feasibility of sealing the gas extraction drill hole, and primarily judging sealing parameters; the stability of the surrounding rock mainly refers to the stability of rock layers passing through a drilled hole, and the stability of the surrounding rock is divided into five grades, namely stable (no support and no falling block), stable (small blocks can fall without support), medium stable (local falling block after 1 month of maintenance is stable), unstable (the stable time is only a few days) and extremely unstable (easy caving) according to five parameters of three surrounding rock strength indexes (the strength of a coal roadway top plate, the strength of a bottom plate surrounding rock and the strength of two sides of surrounding rocks), burial depth, rock integrity indexes, the ratio of the thickness of a direct roof to mining height and the width of a coal pillar of a protective roadway; the drill hole integrity is divided into three grades of drill hole integrity (small cracks or basically no cracks), normal fracture (normal crack development) and severe fracture (maximum crack development); the gas content is divided into three grades of small (less than or equal to 8 m/t), large (8-12 m/t) and large (more than or equal to 12 m) flowering. The gas pressure is divided into three grades of low (less than or equal to 0.74 MPa), high (0.74-1.2 MPa) and extremely high (more than or equal to 1.2 MPa).
The specific operation process of the step (2) is as follows:
firstly, preparing equipment and components of a reusable and automatic pressure supplementing gas extraction drilling and sealing system, and simultaneously preparing slurry, wherein the slurry is prepared from guanidine gum, boron powder and glycerol; then connecting a reusable and automatic pressure supplementing gas extraction drilling and sealing system at a hole sealing place; debugging is carried out after connection; determining hole sealing parameters according to the judgment of the coal bed gas extraction geological features in the step (1); constructing and drilling and washing holes according to design requirements, ensuring the integrity of the drilled holes, avoiding the situations of deformation and hole collapse, and plugging the bag type hole sealing device, the gas extraction pipe, the grouting pipe and the recovery pipe into the drilled holes according to design hole sealing parameters; a working face hole sealing grouting pipeline is laid along the edge of the roadway; after the preparation work is finished, the whole set of hole sealing equipment is debugged to ensure smooth operation.
The specific operation process of the step (3) is as follows:
two bags are firstly subjected to 'two-plugging': the hole sealing grouting pump assembly is controlled to start grouting through the PLC, check valves in the left bag and the right bag are opened, the hole sealing grouting pump assembly extracts slurry in the liquid storage tank and fills the slurry into the left bag and the right bag, the left bag and the right bag expand radially, a plurality of sealing convex edge strips generate jacking pressure with the wall of a drill hole through the wear-resistant elastic cloth sleeves, and after the pressure of the hole sealing slurry in the left bag and the right bag reaches a specified value, the drill hole is firmly sealed by the left bag and the right bag at the left end and the right end of a hole sealing section, so that 'double plugging' is completed;
then, the grouting sealing section is subjected to 'first injection': and (2) continuously pressurizing and grouting the hole sealing grouting pump assembly, opening an explosion valve in the grouting sealing section due to the pressure action, grouting into the grouting sealing section by the hole sealing grouting pump assembly, closing a manual ball valve on the recovery pipe all the time in the grouting process, closing the manual ball valve at the pressure in the pressure grouting stage, closing the electromagnetic valve and the hole sealing grouting pump assembly by the PLC after the indication number of a pressure gauge on the grouting pipe is 2-2.5 times of the coal bed pressure and the pressure is stable, stopping grouting and completing 'one-shot'.
The specific operation process of the step (4) is as follows:
automatic pressure-supplementing grouting: in the gas extraction process, when the numerical value of a pressure gauge on a grouting pipe is transmitted to a PLC (programmable logic controller) through a pressure sensor, the PLC controls the opening and closing of an electromagnetic valve; when the numerical value of the pressure gauge is smaller than the coal seam pressure, generally considering that the numerical value of the pressure gauge is 1.2-1.5 times of the coal seam gas pressure, sending a signal to an electromagnetic valve and a hole sealing grouting pump assembly by a PLC (programmable logic controller), opening the electromagnetic valve, starting the hole sealing grouting pump assembly, performing grouting pressure compensation on a grouting sealing section through a grouting pipe, enabling the numerical value of the pressure gauge to reach a specified pressure, sending a closing signal to the electromagnetic valve and the hole sealing grouting pump assembly by the PLC, stopping automatic grouting, closing the electromagnetic valve, and continuing gas extraction operation;
and (3) recycling the slurry: after gas extraction of a certain drill hole on the working face is finished, opening a manual ball valve outside the drill hole, starting a negative pressure recovery pump assembly, extracting slurry in the hole sealing section, the left bag and the right bag, filtering by a filter, and then pumping back to the liquid storage tank; when the hole sealing pressure of the drilled hole is not extracted and reduced, the hole sealing grouting pump assembly extracts the slurry recovered in the liquid storage tank to realize grouting and pressure supplementing.
By adopting the technical scheme, the hole sealing can not be adopted for the conditions of large gas pressure, large ground stress, serious drilling breakage degree and large crack gap. The invention can be used for sealing holes under the conditions of large gas pressure, general ground stress and general drilling breakage degree. The invention can be used for sealing holes under the conditions of general gas pressure, large ground stress and general drill hole crushing degree.
The gas pressure and the ground stress meet the requirements, and when the hole sealing device is used for sealing holes, for the drilled holes with excessively developed cracks, the fluidity of the slurry is reduced by increasing the proportion of the guanidine gum and the boron powder in the slurry, and the supporting effect of the slurry on the drilled holes is enhanced. For general drilling holes in crack development, the proportion of glycerin in the slurry can be increased in a proper amount, the fluidity of the slurry is improved, and the cracks are better attached.
When the gas pressure is high, the hole sealing position pressure can be improved by increasing the length of the bag, the initial bag length is set to be 1m, the bag is gradually increased upwards by taking 0.5m as a unit, and the maximum length of the bag is 2.5 m. The initial length of the grouting sealing section is 1m, the maximum length is 3m, and the pressure at the grouting position can also be changed by adjusting the length of the grouting section by taking 0.5m as a unit. If the gas pressure is extremely large, the length of the bag reaches 2.5m, the length of the grouting sealing section reaches 3m, and the requirement of hole sealing pressure cannot be met, and whether the hole sealing is selected or not needs to be measured according to the hole sealing cost.
The bag is a double-layer bag, the inner layer bag is made of rubber with a certain thickness and comprises a sealing convex rib strip and a convex rib reinforcing strip, the sealing convex rib strip and the convex rib reinforcing strip are integrally arranged on the circumference, and the outer layer bag is a wear-resistant elastic cloth sleeve (made of cotton rib cloth). The inner layer bag has good expansion and contraction performance and plays a role in expansion and plugging. The friction of the inner layer bag and the inner wall of the drilled hole can be reduced while the outer layer bag is sealed and plugged in an expanding mode, and the service life of the inner layer bag is prolonged.
The gas drainage pipe penetrates into the center cylindrical hole of the inner-layer bag, the gas drainage pipe and the inner-layer bag stretch into the drill hole, high-pressure slurry is filled into the inner-layer bag, the inner-layer bag expands, the inner wall of the drill hole is not smooth and flat, and a plurality of depressions or protrusions are formed, so that a plurality of sealing convex edge strips of the excircle of the expanded inner-layer bag outwards push the wear-resistant elastic cloth cover, and the depressions or protrusions in different areas of the inner wall of the drill hole are tightly attached to each other, so that a better sealing effect is achieved. The outer sealing convex rib also has the effect of improving the bearing strength of the inner-layer bag, and after the wear-resistant elastic cloth sleeve is used and worn for many times, the sealing convex rib and the inner wall of the drill hole are in sliding friction when the inner wall of the drill hole moves, so that the abrasion of the excircle of the inner-layer bag body is reduced. The cross section of the sealing convex edge strip is of a semicircular structure, so that the sealing structure is convenient to produce and manufacture, the sealing area is increased after extrusion, and the sealing effect is good.
Be equipped with manual ball valve on the recovery tube, the recovery mouth that sets up on the recovery tube communicates with left bag, hole sealing section and right bag respectively for the extraction thick liquid, manual ball valve on the recovery tube only opens at the thick liquid recovery in-process, is in closed state under the usual state and maintains hole sealing section internal pressure always.
The whole operation process of the system is controlled by the PLC, the reading of a pressure gauge on the grouting pipe is displayed by the PLC, the opening and closing of the electromagnetic valve are controlled according to the pressure value, and the grouting and pressure supplementing are automatically carried out when the pressure of the slurry in the hole sealing section is reduced.
Because the grout can permeate the coal seam at the hole sealing in-process, consequently seted up fluid infusion mouth at the liquid storage pot top, through fluid infusion mouthful to replenishing the grout in the liquid storage pot.
The time required for completely drilling and extracting the working face is determined according to the actual extraction amount of the mine gas, and if the extraction time is not more than 10 days, the automatic grouting and pressure supplementing device can control automatic grouting and pressure supplementing through the PLC, does not need real-time inspection of workers, and cleans waste materials. And if the extraction time exceeds 10 days, the system is required to be periodically overhauled by taking 10 days as a unit, the running condition of the system is checked, and waste materials in the filter are cleaned.
In conclusion, the invention realizes repeated grouting and pressure compensation, and repeated use of the slurry and hole sealing device, solves the problems of low gas extraction concentration, fast attenuation and poor extraction effect, improves the extraction efficiency of the drilled hole, and realizes intelligent and automatic drilling and hole sealing. The problem of multiple grouting and pressure supplementing can be solved, the labor amount of extraction operation can be reduced, the expenditure of hole sealing of workers is reduced, hole sealing operation is more convenient and efficient, and automatic hole sealing is realized. The invention conforms to the current intelligent mining direction of coal mines, and builds an automatic grouting, pressure-compensating and hole-sealing system for working face drilling, which can be used, practical, effective and efficiently operated, by a unified intelligent integrated control platform. After the platform is implemented, automation of a drilling and hole sealing process of a working face can be realized, meanwhile, the integrated communication capacity of the working face is realized, integrated monitoring, scheduling and management application are realized, and safety, reliability, high efficiency, minimized cost and maximized benefit of a mine are realized. The method has obvious economic and social benefits for safe, efficient and intelligent production of the coal mine.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic cross-sectional view of a bladder of the present invention;
FIG. 3 is a schematic end view of a bladder of the present invention;
FIG. 4 is a schematic view showing the construction of a recovery pipe according to the present invention;
FIG. 5 is a hole sealing layout for cross-drilled gas extraction according to the present invention;
FIG. 6 is a hole sealing layout diagram when the method is used for gas extraction of the cross-cut borehole.
Detailed Description
As shown in fig. 1-6, the reusable automatic pressure supplementing gas extraction drilling and sealing system comprises a liquid storage tank 1, a hole sealing grouting pump assembly 2, a bag type sealing device, a negative pressure recovery pump assembly 3 and a PLC automatic control system, wherein the bag type sealing device is installed outside a gas extraction pipe 4 and extends into a drill hole 5, the drill hole 5 is in a direction from left to right from an orifice to the bottom of the hole, slurry is stored in the liquid storage tank 1, an inlet of the hole sealing grouting pump assembly 2 is connected with an outlet of the liquid storage tank 1, a grouting pipe 5 and a recovery pipe 6 are arranged in the bag type sealing device in a penetrating manner, an outlet of the hole sealing grouting pump assembly 2 is connected with a left port of the grouting pipe 5, an inlet of the negative pressure recovery pump assembly 3 is connected with a left port of the recovery pipe 6, and an outlet of the negative pressure recovery pump assembly 3 is connected with an inlet at the top of the liquid storage tank 1 through a filter 7; PLC automatic control system includes PLC controller 8, solenoid valve 9, manometer 10 and pressure sensor 11, and solenoid valve 9 and manometer 10 are installed on slip casting pipe 5, and pressure sensor 11 is connected between the output of manometer 10 and PLC controller 8's input, and PLC controller 8's output is connected with solenoid valve 9's input and hole sealing slip casting pump package 2's input respectively.
The bag type hole sealing device comprises a left bag 12 and a right bag 13 which are coaxially arranged on the gas extraction pipe 4, the left bag 12 and the right bag 13 are cylindrical in shape, and cylindrical holes 14 sleeved on the excircle of the gas extraction pipe 4 are formed in the centers of the left bag 12 and the right bag 13;
a grouting sealing section 15 is formed between the left bag 12 and the right bag 13 through the drill hole 5, the grouting pipe 5 sequentially penetrates through the left bag 12 and the grouting sealing section 15 from left to right and then extends into the right bag 13, check valves 16 are arranged on the grouting pipe 5 inside the left bag 12 and the right bag 13, and a blasting valve 17 is arranged on the grouting pipe 5 inside the grouting sealing section 15.
The outer circles of the left bag 12 and the right bag 13 are both provided with annular sealing reinforcing structures; the annular sealing reinforcing structure comprises a plurality of sealing convex rib strips 18 which are all in a circular ring shape, all the sealing convex rib strips 18 are arranged at intervals along the direction of the central line of the bag uniformly, the cross section of each sealing convex rib strip 18 is in a semicircular structure, and the sealing convex rib strips 18 and the bag are manufactured into an integral structure; the excircle of the left bag 12 and the right bag 13 is sleeved with a wear-resistant elastic cloth sleeve 19.
End face reinforcing structures are arranged on the left end plane and the right end plane of the left bag 12 and the right bag 13; the end face reinforcing structure comprises a plurality of convex rib reinforcing strips 20, all the convex rib reinforcing strips 20 are uniformly arranged along the circumferential direction of the end face of the bag, each convex rib reinforcing strip 20 is arranged along the radial direction of the bag, and the convex rib reinforcing strips 20 and the bag are made into an integral structure.
A manual ball valve 21 is arranged outside the opening of the drill hole 5 on the recovery pipe 6, and recovery ports 22 which are respectively communicated with the insides of the left bag 12, the grouting sealing section 15 and the right bag 13 on the recovery pipe 6.
The working method of the reusable and automatic pressure supplementing gas extraction borehole 5 hole sealing system sequentially comprises the following steps:
(1) judging and recognizing the geological features of coal seam gas extraction;
(2) installing and debugging a reusable and automatic pressure supplementing gas extraction borehole 5 hole sealing system;
(3) the hole sealing operation is carried out by a hole sealing system of the reusable and automatic pressure supplementing gas extraction drill hole 5 of the manual control drill hole 5;
(4) in the gas extraction process, the reusable automatic pressure supplementing gas extraction borehole 5 hole sealing system carries out automatic hole sealing operation;
(5) and after the gas extraction of the working surface is finished, recovering reusable slurry and equipment of the automatic pressure supplementing gas extraction drilling hole 5 and hole sealing system.
The specific contents of the coal bed gas extraction geological feature judgment in the step (1) are as follows:
judging and identifying the geological conditions of the gas according to the related indexes of the gas content, the gas pressure, the stability of surrounding rocks, the integrity of the drill hole 5 and the ground stress of the coal seam, analyzing the hole sealing feasibility of the gas extraction drill hole 5 and primarily judging hole sealing parameters; the stability of the surrounding rock mainly refers to the stability of a rock stratum through which the drill hole 5 passes, and the stability of the surrounding rock is divided into five grades, namely, stable (no support and no falling block), stable (small blocks can fall without support), medium stable (local falling block after 1 month of maintenance is stable), unstable (the stable time is only a few days) and extremely unstable (easy caving) according to five parameters of three surrounding rock strength indexes (the strength of a coal roadway top plate, the strength of a bottom plate surrounding rock and the strength of two sides of surrounding rocks), burial depth, rock integrity indexes, the ratio of the thickness of a direct roof to the mining height and the width of a coal pillar of a protective roadway; the integrity of the drill hole 5 is divided into three grades, namely the drill hole 5 is complete (the crack is small or basically not), normal fracture (the crack develops normally) and severe fracture (the crack develops greatly); the gas content is divided into three grades of small (less than or equal to 8 m/t), large (8-12 m/t) and large (more than or equal to 12 m) flowering. The gas pressure is divided into three grades of low (less than or equal to 0.74 MPa), high (0.74-1.2 MPa) and extremely high (more than or equal to 1.2 MPa), and the three grades are shown in the following table:
the gas pressure and the ground stress meet the requirements, and when the hole sealing method is used for sealing holes, for a drill hole with excessively developed cracks, the proportion of guanidine gum to boron powder in slurry is increased, for example, the proportion of guanidine gum: boron powder: the glycerol is 2: 2: 1, the slurry preparation ratio reduces the slurry fluidity and strengthens the supporting effect of the slurry on the drill hole, but the proportion of the guanidine gum and the boron powder in the slurry is not more than 85 percent, so that the problem that the slurry has poor fluidity and can not effectively block the crack is avoided. For general drilling holes in fracture development, the proportion of glycerol in the slurry can be increased in a proper amount, for example, guanidine gum, boron powder and glycerol are selected to be 2: 2: and 4, the slurry is prepared in a ratio of more than 4, the slurry fluidity is improved, and the gap is more fit, but the ratio of glycerin in the slurry is not more than 60%, so that the phenomenon that the slurry has too strong fluidity and flows out of a plugging area along the gap, and the too strong fluidity cannot provide enough supporting pressure is avoided.
When the gas pressure is high, the hole sealing position pressure can be improved by increasing the length of the bag, the initial bag length is set to be 1m, the bag is gradually increased upwards by taking 0.5m as a unit, and the maximum length of the bag is 2.5 m. The initial length of the grouting sealing section is 1m, the maximum length is 3m, and the pressure at the grouting position can also be changed by adjusting the length of the grouting section by taking 0.5m as a unit. If the gas pressure is extremely large, the length of the bag reaches 2.5m, the length of the grouting sealing section reaches 3m, and the requirement of hole sealing pressure cannot be met, and whether the hole sealing is selected or not needs to be measured according to the hole sealing cost.
The specific operation process of the step (2) is as follows:
firstly, preparing equipment and parts of a reusable and automatic pressure supplementing gas extraction borehole 5 hole sealing system, and simultaneously preparing slurry, wherein the slurry is prepared from guanidine gum, boron powder and glycerol; then connecting a reusable and automatic pressure supplementing gas extraction borehole 5 hole sealing system at a hole sealing site; debugging is carried out after connection; determining hole sealing parameters according to the judgment of the coal bed gas extraction geological features in the step (1); constructing a drill hole 5 and washing the hole according to design requirements, ensuring the integrity of the drill hole 5, avoiding the situations of deformation and hole collapse, and plugging the bag type hole sealing device together with the gas extraction pipe 4, the grouting pipe 5 and the recovery pipe 6 into the drill hole 5 according to design hole sealing parameters; paving 5 paths of working face hole sealing grouting pipes along the edge of the roadway; after the preparation work is finished, the whole set of hole sealing equipment is debugged to ensure smooth operation.
The specific operation process of the step (3) is as follows:
two bags are firstly subjected to 'two-plugging': the hole sealing grouting pump assembly 2 is controlled to start grouting through the PLC 8, check valves 16 in a left bag 12 and a right bag 13 are opened, the hole sealing grouting pump assembly 2 extracts slurry in the liquid storage tank 1 and fills the slurry into the left bag 12 and the right bag 13, the left bag 12 and the right bag 13 expand radially, a plurality of sealing convex edge strips 18 are pressed against the hole wall of the drill hole 5 through wear-resistant elastic cloth sleeves 19, and after the pressure of the hole sealing slurry in the left bag 12 and the right bag 13 reaches a specified value, the left bag 12 and the right bag 13 at the left end and the right end of a hole sealing section firmly seal the drill hole 5 to complete 'two-plugging';
then, the grouting sealing section 15 is injected with: the hole sealing grouting pump assembly 2 continues pressurizing grouting, the internal explosion valve 17 of the grouting sealing section 15 is opened due to the pressure effect, the hole sealing grouting pump assembly 2 starts grouting into the grouting sealing section 15, the manual ball valve 21 on the recovery pipe 6 is closed all the time in the grouting process, the stage is a pressurized grouting stage, after the indication of the pressure gauge 10 on the grouting pipe 5 is 2-2.5 times of the coal bed pressure and the pressure is stable, the PLC 8 closes the electromagnetic valve 9 on the grouting pipe 5 and the hole sealing grouting pump assembly 2, grouting is stopped, and 'one-shot grouting' is completed.
The specific operation process of the step (4) is as follows:
automatic pressure-supplementing grouting: in the gas extraction process, when the numerical value of a pressure gauge 10 on the grouting pipe 5 is transmitted to the PLC 8 through a pressure sensor 11, the PLC 8 controls the opening and closing of an electromagnetic valve 9; when the value of the pressure gauge 10 is smaller than the coal seam pressure, generally considering that the value of the pressure gauge 10 is 1.2-1.5 times of the coal seam gas pressure, the PLC 8 sends a signal to the electromagnetic valve 9 and the hole sealing grouting pump assembly 2, the electromagnetic valve 9 is opened, the hole sealing grouting pump assembly 2 is started, grouting and pressure compensation are carried out on the grouting sealing section 15 through the grouting pipe 5, the value of the pressure gauge 10 reaches the specified pressure, the PLC 8 sends a closing signal to the electromagnetic valve 9 and the hole sealing grouting pump assembly 2, automatic grouting is stopped, the electromagnetic valve 9 is closed, and gas extraction operation is continued;
and (3) recycling the slurry: after gas extraction of a certain drill hole 5 of the working face is finished, opening a manual ball valve 21 outside the drill hole 5, starting a negative pressure recovery pump assembly 3, extracting slurry in the hole sealing section, the left bag 12 and the right bag 13, filtering by a filter 7, and then pumping back to the liquid storage tank 1; when the hole sealing pressure of the drilled hole 5 is not extracted and reduced, the hole sealing grouting pump assembly 2 is used for extracting the recovered slurry in the liquid storage tank 1 to realize grouting and pressure supplementing.
Fig. 5 is a hole sealing layout diagram when the method is used for cross borehole gas extraction, and fig. 6 is a hole sealing layout diagram when the method is used for cross borehole gas extraction. A bag type hole sealing device is arranged in each drill hole, a plurality of grouting pipes 5 are arranged in parallel, a plurality of recovery pipes 6 are arranged in parallel, grouting and slurry supplementing are unified, slurry is recovered one by one, and equipment is recovered after drilling extraction is completed. The construction operation is simpler and more convenient, and the construction efficiency is greatly improved.
In the invention, the liquid storage tank 1, the hole sealing grouting pump assembly 2, the negative pressure recovery pump assembly 3, the filter, the valve, the PLC automatic control system and other parts are all in the prior art and are commercially available, so the specific structure is not described again.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described above, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. Reusable and automatic pressure supplementing gas extraction drilling and sealing system, which is characterized in that: the gas extraction and recovery system comprises a liquid storage tank, a hole sealing and grouting pump assembly, a bag type hole sealing device, a negative pressure recovery pump assembly and a PLC automatic control system, wherein the bag type hole sealing device is installed outside a gas extraction pipe and extends into a drill hole, the direction from the hole opening to the hole bottom of the drill hole is from left to right, slurry is stored in the liquid storage tank, an inlet of the hole sealing and grouting pump assembly is connected with an outlet of the liquid storage tank, a grouting pipe and a recovery pipe penetrate through the bag type hole sealing device, an outlet of the hole sealing and grouting pump assembly is connected with a left port of the grouting pipe, an inlet of the negative pressure recovery pump assembly is connected with a left port of the recovery pipe, and an outlet of the negative pressure recovery pump assembly is connected with an inlet at the top of the liquid storage tank through a filter; the PLC automatic control system comprises a PLC controller, an electromagnetic valve, a pressure gauge and a pressure sensor, the electromagnetic valve and the pressure gauge are installed on the grouting pipe, the pressure sensor is connected between the output end of the pressure gauge and the input end of the PLC controller, and the output end of the PLC controller is connected with the input end of the electromagnetic valve and the input end of the hole sealing grouting pump assembly respectively.
2. The reusable and automatic pressure supplementing gas extraction drilling and sealing system according to claim 1, characterized in that: the bag type hole sealing device comprises a left bag and a right bag which are coaxially arranged on the gas extraction pipe, the shapes of the left bag and the right bag are cylindrical, and cylindrical holes sleeved on the excircle of the gas extraction pipe are formed in the centers of the left bag and the right bag;
drilling forms the sealed section of slip casting between left bag and right bag, and the slip casting pipe stretches into right bag inside after passing left bag, the sealed section of slip casting in proper order from the left side to the right side, all is equipped with the check valve in left bag and right bag inside on the slip casting pipe, is equipped with the blast valve in the sealed section of slip casting inside on the slip casting pipe.
3. The reusable and automatic pressure supplementing gas extraction drilling and sealing system according to claim 2, characterized in that: the outer circles of the left bag and the right bag are provided with annular sealing reinforcing structures; the annular sealing reinforcing structure comprises a plurality of sealing convex edge strips which are all in a circular ring shape, all the sealing convex edge strips are arranged at intervals along the direction of the central line of the bag, the cross section of each sealing convex edge strip is in a semicircular structure, and the sealing convex edge strips and the bag are manufactured into an integral structure; the excircle covers of left bag and right bag are equipped with wear-resisting elastic cloth cover.
4. The reusable automatic pressure supplementing gas extraction borehole sealing system according to claim 2 or 3, characterized in that: end face reinforcing structures are arranged on the left end plane and the right end plane of the left bag and the right bag; the end face reinforcing structure comprises a plurality of convex rib reinforcing strips, all the convex rib reinforcing strips are uniformly arranged along the circumferential direction of the end face of the bag, each convex rib reinforcing strip is arranged along the radial direction of the bag, and the convex rib reinforcing strips and the bag are made into an integral structure.
5. The reusable and automatic pressure supplementing gas extraction drilling and sealing system according to claim 4, characterized in that: and a manual ball valve is arranged outside the hole opening of the drilling hole on the recovery pipe, and the recovery openings are respectively communicated with the insides of the left bag, the grouting sealing section and the right bag on the recovery pipe.
6. The working method of the reusable automatic pressure supplementing gas extraction drilling and sealing system according to claim 5 is characterized in that: the method sequentially comprises the following steps:
(1) judging and recognizing the geological features of coal seam gas extraction;
(2) installing and debugging a reusable and automatic pressure supplementing gas extraction drilling and sealing system;
(3) the hole sealing operation is carried out by manually controlling the reusable automatic pressure supplementing gas extraction drilling and hole sealing system of the drill hole;
(4) in the gas extraction process, the reusable automatic pressure supplementing gas extraction drilling and sealing system carries out automatic sealing operation;
(5) and after the gas extraction of the working surface is finished, recovering reusable slurry and equipment of the automatic pressure supplementing gas extraction drilling and sealing system.
7. The working method of the reusable and automatic pressure supplementing gas extraction drilling and sealing system according to claim 6, characterized by comprising the following steps: the specific contents of the coal bed gas extraction geological feature judgment in the step (1) are as follows:
judging and recognizing the geological conditions of the gas according to the related indexes of the gas content, the gas pressure, the stability of surrounding rocks, the integrity of the drill hole and the ground stress of the coal seam, analyzing the feasibility of sealing the gas extraction drill hole, and primarily judging sealing parameters; the stability of the surrounding rock mainly refers to the stability of rock layers passing through a drilled hole, and the stability of the surrounding rock is divided into five grades, namely stable (no support and no falling block), stable (small blocks can fall without support), medium stable (local falling block after 1 month of maintenance is stable), unstable (the stable time is only a few days) and extremely unstable (easy caving) according to five parameters of three surrounding rock strength indexes (the strength of a coal roadway top plate, the strength of a bottom plate surrounding rock and the strength of two sides of surrounding rocks), burial depth, rock integrity indexes, the ratio of the thickness of a direct roof to mining height and the width of a coal pillar of a protective roadway; the drill hole integrity is divided into three grades of drill hole integrity (small cracks or basically no cracks), normal fracture (normal crack development) and severe fracture (maximum crack development); the gas content is divided into three grades of small (less than or equal to 8 m/t), large (8-12 m/t) and great (more than or equal to 12 m) flowering due to the fact that the fruit is subjected to thin-wall hot rolling; the gas pressure is divided into three grades of low (less than or equal to 0.74 MPa), high (0.74-1.2 MPa) and extremely high (more than or equal to 1.2 MPa).
8. The working method of the reusable and automatic pressure supplementing gas extraction drilling and sealing system according to claim 7 is characterized in that: the specific operation process of the step (2) is as follows:
firstly, preparing equipment and components of a reusable and automatic pressure supplementing gas extraction drilling and sealing system, and simultaneously preparing slurry, wherein the slurry is prepared from guanidine gum, boron powder and glycerol; then connecting a reusable and automatic pressure supplementing gas extraction drilling and sealing system at a hole sealing place; debugging is carried out after connection; determining hole sealing parameters according to the judgment of the coal bed gas extraction geological features in the step (1); constructing and drilling and washing holes according to design requirements, ensuring the integrity of the drilled holes, avoiding the situations of deformation and hole collapse, and plugging the bag type hole sealing device, the gas extraction pipe, the grouting pipe and the recovery pipe into the drilled holes according to design hole sealing parameters; a working face hole sealing grouting pipeline is laid along the edge of the roadway; after the preparation work is finished, the whole set of hole sealing equipment is debugged to ensure smooth operation.
9. The working method of the reusable and automatic pressure supplementing gas extraction drilling and sealing system according to claim 8, characterized by comprising the following steps: the specific operation process of the step (3) is as follows:
two bags are firstly subjected to 'two-plugging': the hole sealing grouting pump assembly is controlled to start grouting through the PLC, check valves in the left bag and the right bag are opened, the hole sealing grouting pump assembly extracts slurry in the liquid storage tank and fills the slurry into the left bag and the right bag, the left bag and the right bag expand radially, a plurality of sealing convex edge strips generate jacking pressure with the wall of a drill hole through the wear-resistant elastic cloth sleeves, and after the pressure of the hole sealing slurry in the left bag and the right bag reaches a specified value, the drill hole is firmly sealed by the left bag and the right bag at the left end and the right end of a hole sealing section, so that 'double plugging' is completed;
then, the grouting sealing section is subjected to 'first injection': and (2) continuously pressurizing and grouting the hole sealing grouting pump assembly, opening an explosion valve in the grouting sealing section due to the pressure action, grouting into the grouting sealing section by the hole sealing grouting pump assembly, closing a manual ball valve on the recovery pipe all the time in the grouting process, closing the manual ball valve at the pressure in the pressure grouting stage, closing the electromagnetic valve and the hole sealing grouting pump assembly by the PLC after the indication number of a pressure gauge on the grouting pipe is 2-2.5 times of the coal bed pressure and the pressure is stable, stopping grouting and completing 'one-shot'.
10. The working method of the reusable and automatic pressure supplementing gas extraction drilling and sealing system according to claim 9, characterized by comprising the following steps: the specific operation process of the step (4) is as follows:
automatic pressure-supplementing grouting: in the gas extraction process, when the numerical value of a pressure gauge on a grouting pipe is transmitted to a PLC (programmable logic controller) through a pressure sensor, the PLC controls the opening and closing of an electromagnetic valve; when the numerical value of the pressure gauge is smaller than the coal seam pressure, generally considering that the numerical value of the pressure gauge is 1.2-1.5 times of the coal seam gas pressure, sending a signal to an electromagnetic valve and a hole sealing grouting pump assembly by a PLC (programmable logic controller), opening the electromagnetic valve, starting the hole sealing grouting pump assembly, performing grouting pressure compensation on a grouting sealing section through a grouting pipe, enabling the numerical value of the pressure gauge to reach a specified pressure, sending a closing signal to the electromagnetic valve and the hole sealing grouting pump assembly by the PLC, stopping automatic grouting, closing the electromagnetic valve, and continuing gas extraction operation;
and (3) recycling the slurry: after gas extraction of a certain drill hole on the working face is finished, opening a manual ball valve outside the drill hole, starting a negative pressure recovery pump assembly, extracting slurry in the hole sealing section, the left bag and the right bag, filtering by a filter, and then pumping back to the liquid storage tank; and after the slurry is pumped back, taking out the bag type hole sealing device at the hole sealing section in the drill hole, and when the hole sealing pressure of the drilled hole is not pumped, extracting the slurry recovered in the liquid storage tank through the hole sealing grouting pump assembly to realize grouting and pressure supplementing.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114607312A (en) * | 2022-03-11 | 2022-06-10 | 中国矿业大学 | Device and method for real-time multiple hole sealing |
| CN115929251A (en) * | 2022-12-05 | 2023-04-07 | 中国矿业大学(北京) | Downhole recyclable dynamic liquid injection hole sealing device and construction method |
| CN116122891A (en) * | 2023-03-01 | 2023-05-16 | 中国矿业大学(北京) | Device and method for improving extraction effect through secondary intelligent hole sealing of gas extraction drilling |
| CN117345173A (en) * | 2023-11-22 | 2024-01-05 | 中国矿业大学(北京) | High drainage roadway gas sectional drainage method |
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2021
- 2021-12-03 CN CN202111468824.8A patent/CN114135249A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114607312A (en) * | 2022-03-11 | 2022-06-10 | 中国矿业大学 | Device and method for real-time multiple hole sealing |
| CN115929251A (en) * | 2022-12-05 | 2023-04-07 | 中国矿业大学(北京) | Downhole recyclable dynamic liquid injection hole sealing device and construction method |
| CN116122891A (en) * | 2023-03-01 | 2023-05-16 | 中国矿业大学(北京) | Device and method for improving extraction effect through secondary intelligent hole sealing of gas extraction drilling |
| CN117345173A (en) * | 2023-11-22 | 2024-01-05 | 中国矿业大学(北京) | High drainage roadway gas sectional drainage method |
| CN117345173B (en) * | 2023-11-22 | 2024-05-10 | 中国矿业大学(北京) | High drainage roadway gas sectional drainage method |
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