CN112682039B - Coal seam drilling and water injection construction process - Google Patents
Coal seam drilling and water injection construction process Download PDFInfo
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Abstract
The invention relates to a coal seam drilling water injection construction process which comprises a pull ring and a mounting frame, wherein an outer sleeve is arranged at the bottom of the pull ring, a water injection unit is sleeved on the outer sleeve, the water injection unit is positioned in the outer sleeve, the mounting frame is in a bench type structure, a limit groove is formed in the top of the mounting frame, the outer sleeve is positioned in the limit groove, and the outer sleeve is in threaded connection with the mounting frame. Through threaded connection setting, the effectual water injection unit that has fixed, cooperation simultaneously is connected articulated setting, the angle of adjustment activity gag lever post forms the auto-lock structure, stability has been increased, well accuse unit is confirmed the operating parameter of water injection unit according to coal seam real-time reference value, and after predetermineeing work, reacquire the environment reference value, the operating parameter of water injection unit is confirmed according to the comparison between the environment reference value, and according to the comparison of real-time environment reference value and the environment reference value last time when predetermineeing the time, reduce the risk of coal seam explosion, improve the water injection efficiency of water injection unit.
Description
Technical Field
The invention relates to the technical field of coal seam water injection, in particular to a coal seam drilling water injection construction process.
Background
The method for plugging the coal mine by using the cement can cause the defects of water leakage, loose plugging, low water pressure, unobvious water injection effect and the like, and is used for injecting water under pressure into the coal seam, so that the physical and mechanical properties and the structure of the coal seam are changed through the high-pressure action of the pressure water, the impact tendency of the coal seam is reduced, and the coal seam drilling water injector is developed. The existing coal seam water injector has certain problems when in use, such as difficult fixation of the water injector, scratch and damage to the pipeline in the use process, increased economic cost, even fracture, not only increased working difficulty, reduced working efficiency, but also certain economic loss.
When the existing coal seam injector is used for injecting water, working parameters of the injector are adjusted according to different depths of a coal seam and real-time coal seam parameters, and water injection efficiency is low.
Disclosure of Invention
Therefore, the invention provides a coal seam drilling water injection construction process which is used for solving the problem of low water injection efficiency caused by the fact that working parameters of a water injector are not adjusted according to different depths of a coal seam and real-time coal seam parameters in the prior art.
In order to achieve the above purpose, the invention provides a coal seam drilling water injection construction process, which comprises the following steps:
the method comprises the steps that firstly, a central control unit establishes a real-time coal seam environment matrix W by receiving data detected by a pressure detector, a dust detector and a humidity detector which are arranged at a coal seam drilling water injection destination in real time;
determining an environment adjusting parameter by the central control unit according to the depth of the current coal seam, and calculating a current coal seam real-time environment reference value e1 according to the determined environment adjusting parameter and according to the real-time pressure intensity of the coal seam in the coal seam environment matrix W, the real-time coal dust concentration of the coal seam and the real-time air dryness of the coal seam;
step three, the central control unit determines the working parameters of the water injection unit according to the environment reference value, and selects corresponding working parameters from the working matrix of the water injection unit;
step four, when the water injection unit works to the corresponding water injection time according to the corresponding selected water injection flow rate, the central control unit collects data in the real-time coal seam environment matrix, calculates a real-time environment reference value e2, compares the environment reference value e2 with the environment reference value e1, and adjusts the water injection flow rate Vi and the water injection time Ti of the working parameters of the water injection unit according to a comparison result;
Fifthly, if e2 is within a preset range of e1, the central control unit directly adjusts working parameters of the water injection unit, if e2 is not within the preset range of e1, the central control unit re-collects calculated environment reference values to be e22, if e22 is not within the preset range of e2, the real-time coal seam environment data acquisition of the central control unit is wrong, if e22 is within the preset range of e2, the central control unit compares the environment reference values of e22 with e1 to adjust the water injection unit and operates according to the adjusted working parameters, and when the water injection unit works to water injection time according to the adjusted water injection flow rate, the central control unit calculates real-time environment reference values and compares the real-time environment reference values with the previous environment reference values, and adjusts the working parameters of the water injection unit until water injection work is completed;
in the first step, for a coal seam environment matrix W (P, F, S), wherein P represents the pressure of the current water injection coal seam, F represents the coal dust concentration of the current water injection coal seam, and S represents the air dryness of the current water injection coal seam;
in the second step, the central control unit calculates the environmental reference value e by the following formula,
e＝a×P/P0+b×F/F0+c×(S/S0)
Wherein a, b and c are environmental adjustment parameters, P represents the pressure of the current water injection coal bed, F represents the coal dust concentration of the current water injection coal bed, S represents the air dryness of the current water injection coal bed, P0 represents the preset pressure of the current water injection coal bed, F0 represents the preset coal dust concentration of the current water injection coal bed, and S0 represents the preset air dryness of the current water injection coal bed.
Further, a preset coal seam depth matrix A0 and an environment adjusting parameter matrix B0 are further arranged in the central control unit, and for the preset coal seam depth matrix A0 (A1, A2, A3 and A4), wherein A1 is a first preset coal seam depth, A2 is a second preset coal seam depth, A3 is a third preset coal seam depth, A4 is a fourth preset coal seam depth, and the preset coal seam depths are gradually increased in sequence;
for the environmental conditioning parameter matrix set B0 (B1, B2, B3, B4), wherein B1 is a first preset environmental conditioning parameter, B2 is a second preset environmental conditioning parameter, B3 is a third preset environmental conditioning parameter, B4 is a fourth preset environmental conditioning parameter, and for the ith environmental conditioning parameter matrix Bi (ai, bi, ci), wherein ai represents an ith preset conditioning value of pressure, bi represents an ith preset conditioning value of coal dust concentration, ci represents an ith preset conditioning value of air dryness.
Further, when the central control unit determines the environmental reference value e, the central control unit selects a corresponding environmental adjustment parameter matrix according to the real-time depth A of the current coal seam,
when A is less than or equal to A1, the central control unit selects A1, B1 and c1 in the environment adjustment parameter matrix B1 to determine an environment reference value e;
when A1 is more than A and less than or equal to A2, the central control unit selects A2, B2 and c2 in the environment adjustment parameter matrix B2 to determine an environment reference value e;
when A2 is more than A and less than or equal to A3, the central control unit selects A3, B3 and c3 in the environment adjustment parameter matrix B3 to determine an environment reference value e;
when A3 is more than A and less than or equal to A4, the central control unit selects A4, B4 and c4 in the environment adjustment parameter matrix B4 to determine an environment reference value e;
when the central control unit selects ai, bi and ci to calculate the environment reference value e, i=1, 2,3,4, e=ai×p/p0+bi×f/f0+ci× (S/S0).
Further, an environment reference value matrix E0 and a water injection unit working parameter matrix Z0 are preset in the central control unit, and for the environment reference value matrix E0 (E1, E2, E3, E4), wherein E1 is a first preset environment reference value, E2 is a second preset environment reference value, E3 is a third preset environment reference value, and E4 is a fourth preset environment reference value; for a water injection unit working parameter matrix group Z0 (Z1, Z2, Z3 and Z4), wherein Z1 is a first preset water injection unit working reference parameter, Z2 is a second preset water injection unit working reference parameter, Z3 is a third preset water injection unit working reference parameter, and Z4 is a fourth preset water injection unit working reference parameter;
For an ith water injection unit working parameter matrix set Zi (Vi, ti), wherein Vi represents an ith preset water injection flow rate matrix, ti represents an ith preset water injection time matrix, and for an ith preset water injection flow rate matrix Vi (V1, V2, V3, V4), wherein V1 is a first preset water injection unit water injection flow rate, V2 is a second preset water injection unit water injection flow rate, V3 is a third preset water injection unit water injection flow rate, and V4 is a fourth preset water injection unit water injection flow rate;
for an i-th preset water injection time matrix Ti (T1, T2, T3, T4), wherein T1 is the water injection time of the first preset water injection unit, T2 is the water injection time of the second preset water injection unit, T3 is the water injection time of the third preset water injection unit, and T4 is the water injection time of the fourth preset water injection unit.
Further, when the central control unit determines the working parameters of the water injection unit according to the environmental reference value e1 acquired in real time,
when E1 is less than or equal to E1, the central control unit determines that the working parameter of the water injection unit is Z1, and selects V1 as the water injection flow rate of the water injection unit, and T1 as the water injection time of the water injection unit;
when E1 is more than or equal to E2, the central control unit determines that the working parameter of the water injection unit is Z2, V2 is selected as the water injection flow rate of the water injection unit, and T2 is the water injection time of the water injection unit;
When E2 is more than or equal to E1 and less than or equal to E3, the central control unit determines that the working parameter of the water injection unit is Z3, and selects V3 as the water injection flow rate of the water injection unit, and T3 as the water injection time of the water injection unit;
when E3 is more than or equal to E1 and less than or equal to E4, the central control unit determines that the working parameter of the water injection unit is Z4, and selects V4 as the water injection flow rate of the water injection unit, and T4 as the water injection time of the water injection unit.
Further, when the water injection unit runs for a preset time Ti according to the working parameter Zi, the central control unit collects the real-time coal seam environment matrix W and calculates a real-time environment reference value e2, compares e1 with e2, adjusts the water injection flow rate Vi and the water injection time Ti of the working parameter of the water injection unit according to the comparison result,
when e2 is less than or equal to 0.9×e1 and less than or equal to e1, the water injection unit works according to the water injection flow rate Vi and the water injection time Ti in the current working parameters;
when e2 is more than or equal to 0.8×e1 and less than 0.9×e1, the central control unit adjusts the water injection flow rate in the working parameters of the water injection unit to be V (i-1), and the water injection time is Ti;
when e1 is less than or equal to e2 and less than 1.1×e1, the central control unit adjusts the water injection flow rate in the working parameters of the water injection unit to V (i+1), and the water injection time is Ti;
when e2 is smaller than or equal to 1.2×e1 and is smaller than 1.2×e1, the central control unit adjusts the water injection flow rate in the working parameters of the water injection unit to V (i+1), and the water injection time is T (i+1).
Further, when e2 is more than or equal to 1.2×e1 or e2 is less than 0.8×e1, the central control unit performs secondary acquisition on the real-time coal seam environment matrix W and calculates a real-time environment reference value e22, compares e22 with e2,
if e2 is more than or equal to 0.9×e22 and less than 1.1×e22, the central control unit adjusts the water injection unit by taking e22 as a real-time environment reference value;
if e2 is more than or equal to 1.1×e22 or e2 is less than 0.9×e22, the central control unit judges that the real-time coal seam environment data acquisition is wrong.
Further, when the central control unit compares the real-time environment reference values e22 and e1 and adjusts the water injection flow rate Vi and the water injection time Ti of the working parameters of the water injection unit to be,
when e22 is smaller than e1 and is larger than or equal to 0.9×e1, the water injection unit works according to the water injection flow rate Vi and the water injection time Ti in the current working parameters;
when e22 is more than or equal to 0.8×e1 and less than 0.9×e1, the central control unit adjusts the water injection flow rate in the working parameters of the water injection unit to be V (i-1), and the water injection time is Ti;
when e1 is less than or equal to e22 and less than 1.1×e1, the central control unit adjusts the water injection flow rate in the working parameters of the water injection unit to V (i+1), and the water injection time is Ti;
when e22 is smaller than or equal to 1.2×e1 and is smaller than 1.1×e1, the central control unit adjusts the water injection flow rate in the working parameters of the water injection unit to V (i+1), and the water injection time is T (i+1);
When e22 is more than or equal to 1.2×e1, the central control unit adjusts the water injection flow rate in the working parameters of the water injection unit to V4, and the water injection time is T4;
when e22 is less than 0.8xe1, the central control unit adjusts the water injection flow rate in the working parameters of the water injection unit to be V (i-2), and the water injection time is T (i-1).
Further, if the water injection flow rate of the water injection unit is V1 or V4, the central control unit adjusts the water injection flow rate to be the water injection flow rate before or after the current water injection flow rate sequence, and takes V1 or V4 as the adjusted water injection flow rate; and if the water injection time of the water injection unit is T1 or T4, the central control unit adjusts the water injection time to be the water injection time before or after the current water injection time sequence, and takes T1 or T4 as the adjusted water injection time.
Further, a water injection device of coal seam water injection drilling construction technology includes:
the bottom of the pull ring is welded with an outer sleeve, a limiting ring is sleeved on the outer sleeve, and the limiting ring is in a hollow circular ring structure and is used for enabling the pull ring to drive the outer sleeve to rotate;
the mounting frame is in a stool-type structure, the mounting frame is arranged below the pull ring, a limiting groove is formed in the top of the mounting frame, the outer sleeve is located in the limiting groove, and the outer sleeve is in threaded connection with the mounting frame and used for supporting the outer sleeve;
The water injection unit is arranged in the outer sleeve, the outer sleeve is sleeved outside the water injection unit, a connecting block is arranged on the outer side wall of the water injection unit in a threaded manner, the connecting block is in a hollow circular structure, the top of the connecting block is hinged with movable limiting rods, the number of the movable limiting rods is three, the movable limiting rods are uniformly distributed on the connecting block, a hollow pipe is welded and arranged at the output end of the water injection unit, a one-way valve is arranged on the hollow pipe, the one-way valve is communicated with the hollow pipe, a flowmeter is arranged at the free end of the one-way valve, the flowmeter is communicated with the hollow pipe, a fixed pipe is welded and arranged at the free end of the hollow pipe, a rubber expansion body is arranged at the free end of the fixed pipe in a threaded manner, a water outlet pipe is connected with the free end of the rubber expansion body in a communicating manner, a water outlet pipe is connected with the free end of the limiting pipe in sequence, water outlet holes are uniformly distributed on the water outlet pipe, and the water injection unit is used for enabling water to sequentially pass through the hollow pipe, the fixed pipe, the rubber expansion body and the water outlet pipe to the water outlet pipe;
The central control unit is arranged on the mounting frame, establishes a real-time coal seam environment matrix by receiving data detected by the pressure detector, the dust detector and the humidity detector arranged at the aim of coal seam drilling water injection in real time, and adjusts water injection parameters.
Compared with the prior art, the method has the beneficial effects that the environment adjustment parameters of the coal bed are determined according to the depth of the coal bed, the real-time pressure intensity of the coal bed, the real-time coal dust concentration of the coal bed and the real-time air dryness of the coal bed are calculated according to the determined environment adjustment parameters, the current real-time environment reference value e of the coal bed is obtained, the working parameters of the water injection unit are determined according to the real-time reference value of the coal bed, when the working flow rate of the preset water injection unit is operated to the preset working time, the real-time pressure intensity of the current coal bed, the real-time coal dust concentration of the coal bed and the real-time air dryness of the coal bed are acquired again, the current real-time environment reference value of the coal bed is obtained and is compared with the last environment reference value, the working parameters of the water injection unit are determined according to the current environment, and the comparison of the real-time environment reference value and the last environment reference value is carried out at the preset time, the risk of explosion of the coal bed is reduced, and the water injection efficiency of the water injection unit is improved.
Particularly, when determining the environment reference value, the pressure intensity, the coal dust concentration and the air dryness of the current water injection coal bed are fully considered, a coal bed depth matrix and an environment adjustment parameter matrix are preset in the central control unit, different environment condition parameters are corresponding to different coal bed depths, and different environment condition parameters are corresponding to the current coal bed real-time depth, so that the accuracy of coal bed data statistics is improved, and the water injection efficiency of the water injection unit is further improved.
Further, the central control unit determines initial working parameters of the water injection unit according to the current real-time environment reference value of the coal seam, establishes a water injection unit working parameter matrix set, and corresponds to different working parameters of the water injection unit according to different ranges of the environment reference value, so that injected water can better permeate into the coal seam, floating dust in the air is reduced, the risk of coal seam explosion is reduced, and the working efficiency of the water injection unit is further improved.
In particular, the invention firstly determines the working parameters of the water injection unit according to the environment reference value, when the water injection unit works to the preset water injection time according to the preset water injection flow rate, the central control unit collects the real-time environment reference value, compares the environment reference value collected in real time with the last environment reference value after the error is eliminated, if the working parameters of the water injection unit do not need to be adjusted within the preset range of the last environment reference value, the effect of improving the environment by gradual water injection of the coal seam is realized, if the last environment reference value which is greater than or equal to 0.8 times is smaller than the last environment reference value which is 0.9 times, the water injection flow rate of the water injection unit is adjusted to the water injection flow rate before the current water injection flow rate sequence, if the real-time environment reference value is greater than or equal to the last environment reference value which is smaller than 1.1 times, the water injection flow rate after the water injection flow rate sequence is adjusted to the current environment reference value which is greater than 1.1 times, the water injection flow rate after the water injection unit is adjusted to the current environment reference value which is equal to the current water injection flow rate sequence, and the water injection flow rate after the water injection sequence is adjusted to the current water injection time sequence is adjusted to the current time which is 1.1 times,
If the real-time environment reference value is greater than or equal to 1.2 times of the last environment reference value, the central control unit adjusts the water injection flow rate to be V4, the water injection time to be V4, and if the real-time environment reference value is less than 0.8 times of the last environment reference value, the central control unit adjusts the water injection flow rate of the water injection unit to be two water injection flow rates before the current water injection flow rate sequence to be adjusted water injection flow rates, and simultaneously adjusts the water injection time to be the water injection time before the current water injection time sequence to be adjusted water injection time.
In particular, after the water injection unit works for a preset time according to a preset flow rate, the central control unit redetermines the environment reference value, compares the environment reference value with the environment reference value determined last time, adjusts the working parameters of the water injection unit if the environment reference value is within a certain range, and performs secondary acquisition on the environment reference value if the environment reference value is not within a certain range, so that the accuracy of the environment reference value is improved, and the water injection efficiency of the water injection unit is further improved.
Furthermore, the coal seam drilling water injection construction device provided by the invention effectively fixes the water injection unit through threaded connection, and simultaneously is matched with connection hinge connection to adjust the angle of the movable limiting rod to form a self-locking structure, so that the stability of the water injector is further maintained, the stability is increased, the working difficulty is reduced, the working efficiency and the economic benefit are increased, the fixing device can be moved through installing the fixing block to be matched with the bolt hole, the movement is convenient, the practicability of the device is improved, and the water injection efficiency of the water injection unit is further improved.
Drawings
FIG. 1 is a schematic structural view of a coal seam drilling water injection construction device according to the invention;
fig. 2 is a schematic structural view of a limiting ring of the coal seam drilling and water injection construction device;
fig. 3 is a schematic diagram of the position relationship of the limiting ring of the coal seam drilling water injection construction device.
Detailed Description
In order that the objects and advantages of the invention will become more apparent, the invention will be further described with reference to the following examples; it should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present invention, and are not intended to limit the scope of the present invention.
It should be noted that, in the description of the present invention, terms such as "upper," "lower," "left," "right," "inner," "outer," and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the apparatus or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, it should be noted that, in the description of the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to the specific circumstances.
Referring to fig. 1, the water injection device of the present invention for a coal seam water injection drilling construction process includes: the bottom of the pull ring 1 is welded with an outer sleeve 3, a limiting ring 4 is sleeved on the outer sleeve 3, and the limiting ring 4 is in a hollow circular ring structure and is used for enabling the pull ring 1 to drive the outer sleeve 3 to rotate; the mounting frame 5 is in a stool-type structure, the mounting frame 5 is arranged below the pull ring 1, a limiting groove 18 is formed in the top of the mounting frame 5, the outer sleeve 3 is positioned in the limiting groove 18, and the outer sleeve 3 is in threaded connection with the mounting frame 5 and is used for supporting the outer sleeve 3; the water injection unit 2, it sets up in the outer sleeve 3, the outer sleeve 3 cover is established outside the water injection unit 2, connecting block 7 is installed to the lateral wall screw thread of water injection unit 2, connecting block 7 is hollow ring structure setting, movable gag lever post 6 is installed in articulated at the top of connecting block 7, the quantity of movable gag lever post 6 is three and evenly distributed on connecting block 7, the output welding of water injection unit 2 installs hollow tube 8, be provided with check valve 9 on the hollow tube 8, check valve 9 and hollow tube 8 are the intercommunication setting, the free end of check valve 9 is provided with flowmeter 10, flowmeter 10 and hollow tube 8 are the intercommunication setting, the free end welding of hollow tube 8 installs fixed pipe 13, and the free end screw thread of fixed pipe 13 installs rubber expansion body 14, fixed pipe 13 and rubber expansion body 14 are the intercommunication setting, the free end welding of rubber expansion body 14 is connected with spacing pipe 15, the free end of spacing pipe 15 is connected with outlet pipe 16, outlet pipe 16 and water pipe 16 are the intercommunication setting up in proper order with spacing pipe 15 and rubber expansion body 14, and outlet pipe 16 are the intercommunication setting up, and outlet pipe 16 evenly distributes water outlet pipe 17, water outlet pipe 17 through the water outlet pipe 17 to the hollow tube 16 to the water injection unit is fixed to the hollow tube 16, the water outlet pipe 17 is used for the transmission hole of water pipe 17.
Specifically, in the embodiment of the present invention, the central control unit is disposed on the mounting frame 5, and establishes a real-time coal seam environment matrix by receiving data detected by the pressure detector, the dust detector and the humidity detector disposed at the destination of coal seam drilling water injection in real time, and adjusts water injection parameters.
Specifically, in the embodiment of the invention, the invention further provides a coal seam drilling water injection construction process, which comprises the following steps:
the method comprises the steps that firstly, a central control unit establishes a real-time coal seam environment matrix W by receiving data detected by a pressure detector, a dust detector and a humidity detector which are arranged at a coal seam drilling water injection destination in real time;
determining an environment adjusting parameter by the central control unit according to the depth of the current coal seam, and calculating a current coal seam real-time environment reference value e1 according to the determined environment adjusting parameter and according to the real-time pressure intensity of the coal seam in the coal seam environment matrix W, the real-time coal dust concentration of the coal seam and the real-time air dryness of the coal seam;
step three, the central control unit determines the working parameters of the water injection unit according to the environment reference value, and selects corresponding working parameters from the working matrix of the water injection unit;
Step four, when the water injection unit works to the corresponding water injection time according to the corresponding selected water injection flow rate, the central control unit collects data in the real-time coal seam environment matrix, calculates a real-time environment reference value e2, compares the environment reference value e2 with the environment reference value e1, and adjusts the water injection flow rate Vi and the water injection time Ti of the working parameters of the water injection unit according to a comparison result;
fifthly, if e2 is within a preset range of e1, the central control unit directly adjusts working parameters of the water injection unit, if e2 is not within the preset range of e1, the central control unit re-collects calculated environment reference values to be e22, if e22 is not within the preset range of e2, the real-time coal seam environment data acquisition of the central control unit is wrong, if e22 is within the preset range of e2, the central control unit compares the environment reference values of e22 with e1 to adjust the water injection unit and operates according to the adjusted working parameters, and when the water injection unit works to water injection time according to the adjusted water injection flow rate, the central control unit calculates real-time environment reference values and compares the real-time environment reference values with the previous environment reference values, and adjusts the working parameters of the water injection unit until water injection work is completed;
Referring to fig. 2-3, the bottom of the mounting frame 5 is welded with four fixing blocks 12, the fixing blocks 12 are arranged in rectangular arrays, the fixing blocks 12 are provided with two bolt holes 11, and the bolt holes 11 are correspondingly arranged.
Specifically, in the embodiment of the invention, the outer sleeve 3 is in a hollow cylindrical structure, the outer side wall of the outer sleeve 3 is provided with threads, the inner side wall of the limiting ring 4 is provided with threads, and the threads on the limiting ring 4 are matched with the threads of the outer sleeve 3 and are opposite to each other.
Specifically, in the embodiment of the present invention, an organic group sleeve is disposed outside the water injection unit 2, and the length of the water injection unit 2 is greater than that of the outer sleeve 3. The inner side wall of the limit groove 18 is provided with threads, and the threads of the limit groove 18 are matched with the threads of the outer sleeve 3 and are opposite to each other.
Specifically, in the embodiment of the present invention, the limiting ring 4 is formed by combining the fastening protruding block 401 and the moving block 402, the moving block 402 and the fastening protruding block 401 are welded and connected, and the fastening protruding blocks 401 are uniformly distributed on the outer side wall of the moving block 402.
Specifically, in the embodiment of the invention, when the device needs to be used, the pull ring 1 is rotated through the threaded connection arrangement of the outer sleeve 3, the mounting frame 5 and the limiting ring 4, so that the water injection unit 2 is fixed at a proper position, meanwhile, the movable limiting rod 6 is adjusted to a proper angle by matching with the hinged arrangement of the connecting block 7 and the movable limiting rod 6, a self-locking structure is formed, the water injection unit 2 is driven, the one-way valve 9 is opened, water injection data is monitored through the flowmeter 10, and water injection work is started by matching with the rubber expansion body 14, the water outlet pipe 16 and the water outlet hole 17.
Specifically, in the embodiment of the present invention, in the step one, for the coal seam environment matrix W (P, F, S), where P represents the pressure of the current water-injected coal seam, F represents the coal dust concentration of the current water-injected coal seam, and S represents the air dryness of the current water-injected coal seam.
In the embodiment of the present invention, in particular, in the second step, the environment reference value e is calculated as,
e＝a×P/P0+b×F/F0+c×(S/S0)
wherein a, b and c are environmental adjustment parameters, P represents the pressure of the current water injection coal bed, F represents the coal dust concentration of the current water injection coal bed, S represents the air dryness of the current water injection coal bed, P0 represents the preset pressure of the current water injection coal bed, F0 represents the preset coal dust concentration of the current water injection coal bed, and S0 represents the preset air dryness of the current water injection coal bed.
Specifically, in the embodiment of the present invention, a preset coal seam depth matrix A0 and an environment adjustment parameter matrix B0 are further provided in the central control unit, and for the preset coal seam depth matrix A0 (A1, A2, A3, A4), wherein A1 is a first preset coal seam depth, A2 is a second preset coal seam depth, A3 is a third preset coal seam depth, A4 is a fourth preset coal seam depth, and the preset coal seam depths gradually increase in sequence.
In particular, it is clear to the person skilled in the art that more than four parameters may be present in the matrix, or up to Xn, and that the invention is not limited to the number of parameters in the matrix, in particular with respect to implementation.
For the environmental conditioning parameter matrix set B0 (B1, B2, B3, B4), wherein B1 is a first preset environmental conditioning parameter, B2 is a second preset environmental conditioning parameter, B3 is a third preset environmental conditioning parameter, B4 is a fourth preset environmental conditioning parameter, and for the ith environmental conditioning parameter matrix Bi (ai, bi, ci), wherein ai represents an ith preset conditioning value of pressure, bi represents an ith preset conditioning value of coal dust concentration, ci represents an ith preset conditioning value of air dryness.
Specifically, in the embodiment of the present invention, the determination of ai, bi, and ci in the environmental conditioning reference matrix Bi may be a fixed value or not, for example, a1 is 0.3, b1 is 0.5, c1 is 0.45, a2 is 0.35, b2 is 0.55, c2 is 0.5, a3 is 0.4, b3 is 0.6, c3 is 0.55, a4 is 0.45, b4 is 0.65, and c4 is 0.6.
Specifically, in the embodiment of the invention, when the central control unit determines the environmental reference value e, the central control unit selects a corresponding environmental adjustment parameter matrix according to the real-time depth A of the current coal seam,
when A is less than or equal to A1, the central control unit selects A1, B1 and c1 in the environment adjustment parameter matrix B1 to determine an environment reference value e;
when A1 is more than A and less than or equal to A2, the central control unit selects A2, B2 and c2 in the environment adjustment parameter matrix B2 to determine an environment reference value e;
when A2 is more than A and less than or equal to A3, the central control unit selects A3, B3 and c3 in the environment adjustment parameter matrix B3 to determine an environment reference value e;
when A3 is more than A and less than or equal to A4, the central control unit selects A4, B4 and c4 in the environment adjustment parameter matrix B4 to determine an environment reference value e;
when the central control unit selects ai, bi and ci to calculate the environment reference value e, i=1, 2,3,4, e=ai×p/p0+bi×f/f0+ci× (S/S0).
Specifically, in the embodiment of the present invention, an environmental reference value matrix E0 and a water injection unit 2 working parameter matrix Z0 are preset in the central control unit, and for the environmental reference value matrix E0 (E1, E2, E3, E4), where E1 is a first preset environmental reference value, E2 is a second preset environmental reference value, E3 is a third preset environmental reference value, and E4 is a fourth preset environmental reference value; for the working parameter matrix group Z0 (Z1, Z2, Z3 and Z4) of the water injection unit 2, wherein Z1 is a first preset water injection unit 2 working reference parameter, Z2 is a second preset water injection unit 2 working reference parameter, Z3 is a third preset water injection unit 2 working reference parameter, and Z4 is a fourth preset water injection unit 2 working reference parameter.
For an ith water injection unit 2 working parameter matrix set Zi (Vi, ti), wherein Vi represents an ith preset water injection flow rate matrix, ti represents an ith preset water injection time matrix, and for an ith preset water injection flow rate matrix Vi (V1, V2, V3, V4), wherein V1 is a first preset water injection unit 2 water injection flow rate, V2 is a second preset water injection unit 2 water injection flow rate, V3 is a third preset water injection unit 2 water injection flow rate, and V4 is a fourth preset water injection unit 2 water injection flow rate.
For an i-th preset water injection time matrix Ti (T1, T2, T3, T4), wherein T1 is the water injection time of the first preset water injection unit 2, T2 is the water injection time of the second preset water injection unit 2, T3 is the water injection time of the third preset water injection unit 2, and T4 is the water injection time of the fourth preset water injection unit 2.
Specifically, in the embodiment of the present invention, when the central control unit determines the working parameters of the water injection unit 2 according to the environmental reference value e1 acquired in real time,
when E1 is less than or equal to E1, the central control unit determines that the working parameter of the water injection unit 2 is Z1, and selects V1 as the water injection flow rate of the water injection unit 2, and T1 as the water injection time of the water injection unit 2;
when E1 is more than or equal to E1 and less than or equal to E2, the central control unit determines that the working parameter of the water injection unit 2 is Z2, selects V2 as the water injection flow rate of the water injection unit 2, and T2 as the water injection time of the water injection unit 2;
When E2 is more than or equal to E1 and less than or equal to E3, the central control unit determines that the working parameter of the water injection unit 2 is Z3, selects V3 as the water injection flow rate of the water injection unit 2, and T3 as the water injection time of the water injection unit 2;
when E3 is more than or equal to E1 and less than or equal to E4, the central control unit determines that the working parameter of the water injection unit 2 is Z4, selects V4 as the water injection flow rate of the water injection unit 2, and T4 as the water injection time of the water injection unit 2.
Specifically, in the embodiment of the present invention, when the water injection unit 2 operates for a preset time Ti according to the working parameter Zi, the central control unit collects the real-time coal seam environment matrix W and calculates the real-time environment reference value e2, compares e1 with e2, adjusts the water injection flow rate Vi and the water injection time Ti of the working parameter of the water injection unit 2 according to the comparison result,
when e2 is less than or equal to 0.9×e1 and less than e1, the water injection unit 2 works according to the water injection flow rate Vi and the water injection time Ti in the current working parameters;
when e2 is more than or equal to 0.8×e1 and less than 0.9×e1, the central control unit adjusts the water injection flow rate in the working parameters of the water injection unit 2 to be V (i-1), and the water injection time is Ti;
when e1 is less than or equal to e2 and less than 1.1×e1, the central control unit adjusts the water injection flow rate in the working parameters of the water injection unit 2 to V (i+1), and the water injection time is Ti;
When e2 is smaller than or equal to 1.2×e1 and is smaller than 1.2×e1, the central control unit adjusts the water injection flow rate in the working parameters of the water injection unit 2 to be V (i+1), and the water injection time is T (i+1).
Specifically, in the embodiment of the present invention, when the environmental reference value is within the previous environmental reference value range, the working parameters of the water injection unit 2 are directly adjusted, and if the currently collected environmental reference value is not within the previous environmental reference value range, the accuracy of data collection is preferentially considered, and the data in the coal seam environment matrix is secondarily collected, so that the accuracy of the data is improved, and the error is reduced.
Specifically, in the embodiment of the invention, when e2 is more than or equal to 1.2×e1 or e2 is less than 0.8×e1, the central control unit performs secondary acquisition on the real-time coal seam environment matrix W and calculates a real-time environment reference value e22, compares e22 with e2,
if e2 is more than or equal to 0.9×e22 and less than 1.1×e22, the central control unit adjusts the water injection unit 2 by taking e22 as a real-time environment reference value;
if e2 is more than or equal to 1.1×e22 or e2 is less than 0.9×e22, the central control unit judges that the real-time coal seam environment data acquisition is wrong.
Specifically, in the embodiment of the present invention, by comparing the two environmental reference values, the probability of error is reduced, so that the data accuracy of the water injection unit 2 is improved, if the data acquired twice is within the preset range, the environmental reference value calculated by the data acquired twice is used as the reference value, and compared with the first environmental reference value, so as to adjust the working parameters of the water injection unit 2.
Specifically, in the embodiment of the present invention, when the central control unit compares the real-time environment reference values e22 and e1 and adjusts the water injection flow rate Vi and the water injection time Ti of the working parameters of the water injection unit 2 to be,
when e22 is smaller than e1 and smaller than 0.9×e1, the water injection unit 2 works according to the water injection flow rate Vi and the water injection time Ti in the current working parameters;
when e22 is more than or equal to 0.8×e1 and less than or equal to 0.9×e1, the central control unit adjusts the water injection flow rate in the working parameters of the water injection unit 2 to be V (i-1), and the water injection time is Ti;
when e1 is less than or equal to e22 and less than 1.1×e1, the central control unit adjusts the water injection flow rate in the working parameters of the water injection unit 2 to V (i+1), and the water injection time is Ti;
when e22 is smaller than or equal to 1.2×e1 and is smaller than 1.1×e1, the central control unit adjusts the water injection flow rate in the working parameters of the water injection unit 2 to V (i+1), and the water injection time is T (i+1);
when e22 is more than or equal to 1.2×e1, the central control unit adjusts the water injection flow rate in the working parameters of the water injection unit 2 to be V4, and the water injection time is T4;
when e22 is less than 0.8xe1, the central control unit adjusts the water injection flow rate in the working parameters of the water injection unit 2 to be V (i-2), and the water injection time is T (i-1).
Specifically, in the embodiment of the present invention, the central control unit adjusts the working parameters of the water injection unit 2 so as to gradually reduce the environmental reference value, improve the water injection efficiency of the water injection unit 2, and improve the permeability of the coal seam, so that the water injection unit 2 can adjust the water injection unit 2 according to the actual environmental reference value of the coal seam.
Specifically, in the embodiment of the present invention, if the water injection flow rate of the water injection unit 2 is V1 or V4, when the central control unit adjusts the water injection flow rate to be the water injection flow rate before or after the current water injection flow rate sequence, V1 or V4 is used as the adjusted water injection flow rate; and if the water injection time of the water injection unit 2 is T1 or T4, the central control unit adjusts the water injection time to be the water injection time before or after the current water injection time sequence, and takes T1 or T4 as the adjusted water injection time.
Having thus described the technical aspects of the present invention with reference to the preferred embodiments illustrated in the accompanying drawings, it will be readily understood by those skilled in the art that the scope of the present invention is not limited to such specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present invention, and such modifications and substitutions will be within the scope of the present invention.
Claims (10)
1. The coal seam drilling water injection construction process is characterized by comprising the following steps of:
the method comprises the steps that firstly, a central control unit establishes a real-time coal seam environment matrix W by receiving data detected by a pressure detector, a dust detector and a humidity detector which are arranged at a coal seam drilling water injection destination in real time;
Determining an environment adjusting parameter by the central control unit according to the depth of the current coal seam, and calculating a current coal seam real-time environment reference value e1 according to the determined environment adjusting parameter and according to the real-time pressure intensity of the coal seam in the coal seam environment matrix W, the real-time coal dust concentration of the coal seam and the real-time air dryness of the coal seam;
step three, the central control unit determines the working parameters of the water injection unit according to the environment reference value, and selects corresponding working parameters from the working matrix of the water injection unit;
step four, when the water injection unit works to the corresponding water injection time according to the corresponding selected water injection flow rate, the central control unit collects data in the real-time coal seam environment matrix, calculates a real-time environment reference value e2, compares the environment reference value e2 with the environment reference value e1, and adjusts the water injection flow rate Vi and the water injection time Ti of the working parameters of the water injection unit according to a comparison result;
fifthly, if e2 is within a preset range of e1, the central control unit directly adjusts the working parameters of the water injection unit, if e2 is not within the preset range of e1, the central control unit acquires data in the coal seam environment matrix in real time and calculates a real-time environment reference value as e22, if e22 is not within the preset range of e2, the real-time coal seam environment data acquisition of the central control unit is wrong, if e22 is within the preset range of e2, the central control unit compares the e22 as the environment reference value with e1 to adjust the water injection unit and operates according to the adjusted working parameters, and when the water injection unit works to water injection time according to the adjusted water injection flow rate, the central control unit acquires the data in the coal seam environment matrix in real time and calculates the real-time environment reference value and compares the real-time environment reference value with the previous environment reference value, and adjusts the working parameters of the water injection unit until water injection work is completed;
In the first step, for a coal seam environment matrix W (P, F, S), wherein P represents the pressure of the current water injection coal seam, F represents the coal dust concentration of the current water injection coal seam, and S represents the air dryness of the current water injection coal seam;
in the second step, the central control unit calculates the environmental reference value e by the following formula,
e＝a×P/P0+b×F/F0+c×(S/S0)
wherein a, b and c are environmental adjustment parameters, P represents the pressure of the current water injection coal bed, F represents the coal dust concentration of the current water injection coal bed, S represents the air dryness of the current water injection coal bed, P0 represents the preset pressure of the current water injection coal bed, F0 represents the preset coal dust concentration of the current water injection coal bed, and S0 represents the preset air dryness of the current water injection coal bed.
2. The coal seam drilling water injection construction process according to claim 1, wherein the central control unit is further provided with a preset coal seam depth matrix A0 and an environment adjustment parameter matrix B0, and for the preset coal seam depth matrix A0 (A1, A2, A3, A4), wherein A1 is a first preset coal seam depth, A2 is a second preset coal seam depth, A3 is a third preset coal seam depth, A4 is a fourth preset coal seam depth, and the preset coal seam depths gradually increase in sequence;
for the environmental conditioning parameter matrix set B0 (B1, B2, B3, B4), wherein B1 is a first preset environmental conditioning parameter, B2 is a second preset environmental conditioning parameter, B3 is a third preset environmental conditioning parameter, B4 is a fourth preset environmental conditioning parameter, and for the ith environmental conditioning parameter matrix Bi (ai, bi, ci), wherein ai represents an ith preset conditioning value of pressure, bi represents an ith preset conditioning value of coal dust concentration, ci represents an ith preset conditioning value of air dryness.
3. The coal seam drilling water injection construction process according to claim 2, wherein when the central control unit determines the environmental reference value e, the central control unit selects a corresponding environmental adjustment parameter matrix according to the real-time depth A of the current coal seam,
when A is less than or equal to A1, the central control unit selects A1, B1 and c1 in the environment adjustment parameter matrix B1 to determine an environment reference value e;
when A1 is more than A and less than or equal to A2, the central control unit selects A2, B2 and c2 in the environment adjustment parameter matrix B2 to determine an environment reference value e;
when A2 is more than A and less than or equal to A3, the central control unit selects A3, B3 and c3 in the environment adjustment parameter matrix B3 to determine an environment reference value e;
when A3 is more than A and less than or equal to A4, the central control unit selects A4, B4 and c4 in the environment adjustment parameter matrix B4 to determine an environment reference value e;
when the central control unit selects ai, bi and ci to calculate the environment reference value e, i=1, 2,3,4, e=ai×p/p0+bi×f/f0+ci× (S/S0).
4. A coal seam drilling water injection construction process according to claim 3, wherein an environment reference value matrix E0 and a water injection unit working parameter matrix Z0 are preset in the central control unit, and for the environment reference value matrix E0 (E1, E2, E3, E4), wherein E1 is a first preset environment reference value, E2 is a second preset environment reference value, E3 is a third preset environment reference value, and E4 is a fourth preset environment reference value; for a water injection unit working parameter matrix group Z0 (Z1, Z2, Z3 and Z4), wherein Z1 is a first preset water injection unit working reference parameter, Z2 is a second preset water injection unit working reference parameter, Z3 is a third preset water injection unit working reference parameter, and Z4 is a fourth preset water injection unit working reference parameter;
For an ith water injection unit working parameter matrix set Zi (Vi, ti), wherein Vi represents an ith preset water injection flow rate matrix, ti represents an ith preset water injection time matrix, and for an ith preset water injection flow rate matrix Vi (V1, V2, V3, V4), wherein V1 is a first preset water injection unit water injection flow rate, V2 is a second preset water injection unit water injection flow rate, V3 is a third preset water injection unit water injection flow rate, and V4 is a fourth preset water injection unit water injection flow rate;
for an i-th preset water injection time matrix Ti (T1, T2, T3, T4), wherein T1 is the water injection time of the first preset water injection unit, T2 is the water injection time of the second preset water injection unit, T3 is the water injection time of the third preset water injection unit, and T4 is the water injection time of the fourth preset water injection unit.
5. The coal seam drilling water injection construction process according to claim 4, wherein when the central control unit determines the working parameters of the water injection unit according to the environmental reference value e1 acquired in real time,
when E1 is less than or equal to E1, the central control unit determines that the working parameter of the water injection unit is Z1, and selects V1 as the water injection flow rate of the water injection unit, and T1 as the water injection time of the water injection unit;
when E1 is more than or equal to E2, the central control unit determines that the working parameter of the water injection unit is Z2, V2 is selected as the water injection flow rate of the water injection unit, and T2 is the water injection time of the water injection unit;
When E2 is more than or equal to E1 and less than or equal to E3, the central control unit determines that the working parameter of the water injection unit is Z3, and selects V3 as the water injection flow rate of the water injection unit, and T3 as the water injection time of the water injection unit;
when E3 is more than or equal to E1 and less than or equal to E4, the central control unit determines that the working parameter of the water injection unit is Z4, and selects V4 as the water injection flow rate of the water injection unit, and T4 as the water injection time of the water injection unit.
6. The coal seam drilling water injection construction process according to claim 5, wherein when the water injection unit operates for a preset time Ti according to the working parameter Zi, the central control unit collects the real-time coal seam environment matrix W and calculates a real-time environment reference value e2, compares e1 with e2, adjusts the water injection flow rate Vi and the water injection time Ti of the working parameter of the water injection unit according to the comparison result,
when e2 is less than or equal to 0.9×e1 and less than or equal to e1, the water injection unit works according to the water injection flow rate Vi and the water injection time Ti in the current working parameters;
when e2 is more than or equal to 0.8×e1 and less than 0.9×e1, the central control unit adjusts the water injection flow rate in the working parameters of the water injection unit to be V (i-1), and the water injection time is Ti;
when e1 is less than or equal to e2 and less than 1.1×e1, the central control unit adjusts the water injection flow rate in the working parameters of the water injection unit to V (i+1), and the water injection time is Ti;
When e2 is smaller than or equal to 1.2×e1 and is smaller than 1.2×e1, the central control unit adjusts the water injection flow rate in the working parameters of the water injection unit to V (i+1), and the water injection time is T (i+1).
7. The coal seam drilling water injection construction process according to claim 6, wherein when e2 is greater than or equal to 1.2xe1 or e2 is less than 0.8xe1, the central control unit performs secondary acquisition on the real-time coal seam environment matrix W and calculates a real-time environment reference value e22, compares e22 with e2,
if e2 is more than or equal to 0.9×e22 and less than 1.1×e22, the central control unit adjusts the water injection unit by taking e22 as a real-time environment reference value;
if e2 is more than or equal to 1.1×e22 or e2 is less than 0.9×e22, the central control unit judges that the real-time coal seam environment data acquisition is wrong.
8. The coal seam drilling water injection construction process according to claim 7, wherein when the central control unit compares the real-time environment reference values e22 and e1 and adjusts the water injection flow rate Vi and the water injection time Ti of the working parameters of the water injection unit to be,
when e22 is smaller than e1 and is larger than or equal to 0.9×e1, the water injection unit works according to the water injection flow rate Vi and the water injection time Ti in the current working parameters;
when e22 is more than or equal to 0.8×e1 and less than 0.9×e1, the central control unit adjusts the water injection flow rate in the working parameters of the water injection unit to be V (i-1), and the water injection time is Ti;
When e1 is less than or equal to e22 and less than 1.1×e1, the central control unit adjusts the water injection flow rate in the working parameters of the water injection unit to V (i+1), and the water injection time is Ti;
when e22 is smaller than or equal to 1.2×e1 and is smaller than 1.1×e1, the central control unit adjusts the water injection flow rate in the working parameters of the water injection unit to V (i+1), and the water injection time is T (i+1);
when e22 is more than or equal to 1.2×e1, the central control unit adjusts the water injection flow rate in the working parameters of the water injection unit to V4, and the water injection time is T4;
when e22 is less than 0.8xe1, the central control unit adjusts the water injection flow rate in the working parameters of the water injection unit to be V (i-2), and the water injection time is T (i-1).
9. The coal seam drilling water injection construction process according to claim 8, wherein if the water injection flow rate of the water injection unit is V1 or V4, the central control unit adjusts the water injection flow rate to be the water injection flow rate before or after the current water injection flow rate sequence, and takes V1 or V4 as the adjusted water injection flow rate; and if the water injection time of the water injection unit is T1 or T4, the central control unit adjusts the water injection time to be the water injection time before or after the current water injection time sequence, and takes T1 or T4 as the adjusted water injection time.
10. A water injection device based on the coal seam drilling water injection construction process of any one of claims 1-9, comprising:
The bottom of the pull ring is welded with an outer sleeve, a limiting ring is sleeved on the outer sleeve, and the limiting ring is in a hollow circular ring structure and is used for enabling the pull ring to drive the outer sleeve to rotate;
the mounting frame is in a stool-type structure, the mounting frame is arranged below the pull ring, a limiting groove is formed in the top of the mounting frame, the outer sleeve is located in the limiting groove, and the outer sleeve is in threaded connection with the mounting frame and used for supporting the outer sleeve;
the water injection unit is arranged in the outer sleeve, the outer sleeve is sleeved outside the water injection unit, a connecting block is arranged on the outer side wall of the water injection unit in a threaded manner, the connecting block is in a hollow circular structure, the top of the connecting block is hinged with movable limiting rods, the number of the movable limiting rods is three, the movable limiting rods are uniformly distributed on the connecting block, a hollow pipe is welded and arranged at the output end of the water injection unit, a one-way valve is arranged on the hollow pipe, the one-way valve is communicated with the hollow pipe, a flowmeter is arranged at the free end of the one-way valve, the flowmeter is communicated with the hollow pipe, a fixed pipe is welded and arranged at the free end of the hollow pipe, a rubber expansion body is arranged at the free end of the fixed pipe in a threaded manner, a water outlet pipe is connected with the free end of the rubber expansion body in a communicating manner, a water outlet pipe is connected with the free end of the limiting pipe in sequence, water outlet holes are uniformly distributed on the water outlet pipe, and the water injection unit is used for enabling water to sequentially pass through the hollow pipe, the fixed pipe, the rubber expansion body and the water outlet pipe to the water outlet pipe;
The central control unit is arranged on the mounting frame, establishes a real-time coal seam environment matrix by receiving data detected by the pressure detector, the dust detector and the humidity detector arranged at the coal seam drilling water injection destination in real time, and adjusts water injection parameters.
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| CN101845949B (en) * | 2010-04-28 | 2013-05-01 | 中国科学院力学研究所 | Indoor simulation device for testing injection/pressure fall of coal bed methane |
| CN103806914B (en) * | 2014-01-27 | 2015-11-11 | 冀中能源峰峰集团有限公司大淑村矿 | A kind of coal and gas outburst mine coal-mining method |
| CN104879168B (en) * | 2015-05-15 | 2017-03-01 | 山东科技大学 | A kind of coal seam high pressure water injection intelligent monitor system and its intelligent control method |
| CN105927266B (en) * | 2016-07-01 | 2018-05-08 | 山东唐口煤业有限公司 | A kind of high-pressure hydraulic fracturing water injection system for coal seams and the automatically-monitored method of water filling |
| CN108645775A (en) * | 2018-05-11 | 2018-10-12 | 山东科技大学 | A kind of non-uniform stress coal-bed flooding seepage flow wetting three dimensional taest system |
| CN110273702B (en) * | 2019-05-31 | 2021-03-30 | 山东科技大学 | Coal seam step-by-step water injection accurate control system and water injection method |
| CN110308246B (en) * | 2019-07-02 | 2020-09-01 | 中国矿业大学 | Outburst elimination technology for water injection of outburst coal seam and outburst elimination effect test method |
| CN111814015B (en) * | 2020-07-09 | 2024-09-06 | 精英数智科技股份有限公司 | Method and device for detecting coal seam water injection effect, electronic equipment and storage medium |
| CN111779451B (en) * | 2020-07-10 | 2022-04-01 | 淮南矿业(集团)有限责任公司 | Fixed-point water injection drilling method for goaf |
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