CN109446602A - A kind of Numerical Experimental Method of surface vertical borehole extraction super high seam gas - Google Patents
A kind of Numerical Experimental Method of surface vertical borehole extraction super high seam gas Download PDFInfo
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Abstract
The invention discloses a kind of Numerical Experimental Methods of surface vertical borehole extraction super high seam gas, analyze software using gas coal rock rupture process, include the steps that establishing engineering document, establish mathematical calculation model and grid dividing, determine key parameter, boundary condition and control condition, numerical value calculate, analysis numerical result figure.The disadvantage that the present invention can make up for it large-scale Physical Experiment and field test is at high cost, operation is difficult, guarantee the validity and reliability of field ground drilling construction, be conducive to ensure mine safety production, also have highly important theory significance and more practical value for the economic benefit and social benefit that improve coal mine.
Description
Technical field
The present invention relates to Safety of Coal Mine Production technical fields, more particularly, to a kind of special with surface vertical borehole extraction
The Numerical Experimental Method of high seam gas.
Background technique
Coal mine gas disaster accident is referred to as " the first killer " of Safety of Coal Mine Production, with powerful destructiveness, and into
Row gas drainage is to prevent the essential measure of coal mine gas explosion.The gas drainage new classified method proposed from professor Yu Qixiang can
Find out, ground well drainage is suitable for different seam mining stages and different gas source spaces.In recent years, gas drainage
Ground drilling technology is also widely applied in colliery scene.
To solve the problems, such as that certain super high seam gas low content height are gushed out under the conditions of high tension coal mining, domestic some coal mines
(such as Datong Coal Group Company Tashan Mountain coal mine) has been carried out the test of surface vertical borehole draining coal seam gas, and extracting result is obvious.
However large-scale Physical Experiment and field test are at high cost, it is difficult to operate, and need one kind pre- to surface vertical borehole
The method that super high seam gas carries out numerical experimentation is taken out, is it to guarantee the validity and reliability of field ground drilling construction
His mine or super high seam ground drilling provide basic data and experience.
In numerical experimentation calculating field, true rupture process analysis method (Realistic Failure Process
Analysis, hereinafter referred to as RFPA) it is a kind of material breaks process based on finite element stress analysis and Statistical Damage point
Analyse numerical computation method, be one can simulation material progressive fracture until unstability overall process numerical experimentation tool.Especially
RFPA2DGas analyzes version, i.e. gas coal rock rupture process analyzes software, the numerical value being mainly used in coal seam containing gas rupture process
Simulation test research, numerical result can show to visual pattern rock stress field in coal seam containing gas rupture process, watt
The evolution in this flow field and the Spatial-temporal Characteristics of sound emission.It has certain application in mine rock mechanics and gas preventing and control field,
But there is presently no be based on RFPA2DGas analyzes the numerical value that version carries out surface vertical borehole extraction super high seam gas
Test, also nobody did substantially so far for the research of this respect, and document also rarely has.How different bore positions and difference are established
The mathematical calculation model of the spacing of wells carries out the setting of parameter assignment, boundary condition and control condition, and according to the meter to software
It calculates result to be analyzed ..., these are with RFPA2DGas analyzes version and carries out surface vertical borehole extraction super high seam gas
Numerical experimentation difficult point.
Summary of the invention
Present invention aim to address the technical operation at high cost of existing surface vertical borehole draining coal seam gas test is difficult
The technical issues of, the present invention utilizes gas coal rock rupture process analysis system, that is, RFPA2DGas analyzes version, provides and a kind of uses ground
Vertical drilling takes out the Numerical Experimental Method of super high seam gas in advance.
The present invention solves technical problem and adopts the following technical scheme that
A kind of Numerical Experimental Method of surface vertical borehole extraction super high seam gas, comprising the following steps:
Step 1, the engineering document of surface vertical borehole extraction super high seam gas is established:
The geologic information of practical mining site is acquired, the ground of surface vertical borehole extraction super high seam gas engineering is established
Matter overview engineering document；The content of the engineering document includes working face position and well upper and lower relation, coal seam situation, gas feelings
Condition, Seam Roof And Floor situation, geological structure situation, hydrological geological conditions；
The coal seam situation includes coal seam thickness, coal bed texture, seam inclination, seam hardness, working seam, coal, steady
Determine degree, index can be adopted；
The gas situation includes coal seam gas-bearing capacity, gas pressure, gas emission；
The Seam Roof And Floor situation includes rock title, thickness, lithologic character；
The geological structure includes tomography, fold.
Step 2, the mathematical calculation model and grid dividing of surface vertical borehole extraction super high seam gas are established:
(a) mathematical calculation model of surface vertical borehole extraction super high seam gas is established:
According to the actual conditions of construction site to the construction technology of surface vertical borehole draining coal seam gas, aperture, extraction
Negative pressure, closure mode are specifically determined；Using large-scale finite element analysis computation software RFPA2DGas analyzes version, distinguishes first
Mathematical calculation model when drilling borehole bottom location is located at coal seam top, coal seam middle part and bottom is established, is calculated by numerical value
Analysis, obtains optimal drilling borehole bottom location model；Then it establishes respectively again on this basis when the borehole bottom location that drills is best
The different spacings of wells mathematical calculation model；The different spacing of wells ranges of choice include 30m, 40m, 50m, 60m,
70m,80m；
(b) grid dividing of surface vertical borehole extraction super high seam gas mathematical calculation model:
Utilize RFPA2DGas analysis version carries out carrying out grid dividing while numerical experimentation modeling, and two work are same
It is configured in a interface, the unit grid of setup algorithm model divides number, and meter according to actual needs in set interface
Calculate the actual size of model；The described actual needs include the ratio of moulded dimension and actual conditions, computer server it is interior
Deposit size and computing capability；
In fact RFPA is utilized in step 22DThe foundation for the computation model that gas analysis version software carries out and grid dividing are
It carries out simultaneously, without carrying out repetitive operation, setting steps are simple and clear, this is also RFPA2DGas analyzes the superior of version software
Property.
Step 3, the key parameter of surface vertical borehole extraction super high seam gas mathematical calculation model is determined:
According to engineering site test data and Physical Experiment Data, the key parameter of mathematical calculation model is determined, including
Homogeneity, elasticity modulus, compression strength, Poisson's ratio, porosity, internal friction angle, pressure Lapie, permeability coefficient, gas bearing capacity system
Number, gas pressure coefficient, the permeability coefficient of coup.
Step 4, the boundary condition and control condition of surface vertical borehole extraction super high seam gas are set:
To make established surface vertical borehole extraction super high seam gas difference drill between borehole bottom location and different drillings
Away from mathematical calculation model numerical experimentation can be carried out under various geological conditions, to the boundary condition and control strip of computation model
Part carries out certain setting that simplifies, specific as follows:
(1) assume that rock mechanics parameters meet Weibull distribution；
(2) rock rupture is judged using Mohr-Coulomb strength criterion；
(3) displacement constraint is used to two boundary of model, bottom boundaries use rigid constraint, either displacement constraint or rigidity
Constraint refers both to non-displacement deformation；
(4) the stratification plane of weakness small to addition elasticity modulus between rock stratum and rock stratum and stretcher strain amount, i.e., using linear
Material replaces plane of weakness between layers；
(5) rock composition for determining coal seam Lao Ding, directly top, direct bottom and past, to old top with mantlerock part, modeling
Shi Jinhang accordingly simplifies, i.e., the pressure of overlying rock is replaced using 0.25MPa/m；
(6) loading method using vertical direction from reloading, i.e., from Gas-bearing Coal Seams to old top according to the bulk density of rock into
The load of row vertical direction, overburden portion are replaced using equally distributed power straight down；
(7) pressure of gas is controlled using head in coal body, i.e. it is high that 1MPa is equal to 100m head, and goaf gas gas
Body pressure is set as 0；
(8) it despite the gas in extraction coal seam, but is to solve for type and is still considered as plane strain problems, total calculating is set
Step, and consider that Y-direction is self-possessed, unit is calculated as empty elements method, ignores the influence that Seepage flow time calculates model.
Step 5, numerical value calculates:
Utilize RFPA2DGas analyzes version and carries out numerical value calculating, the RFPA2DThe numerical procedure of gas analysis version
Including Stress calculation analysis, Phase Transition Analysis and primitive Phase Transition Analysis.
Step 6, the computational results for analyzing surface vertical borehole extraction super high seam gas, obtain most reasonably drilling
Borehole bottom location and the most reasonable spacing of wells:
First according to the drilling borehole bottom location of foundation at the top of coal seam, in the middle part of coal seam and the numerical value of bottom calculate mould
Type passes through RFPA2DGas analysis version numerical value calculates coal bed gas extraction stress rupture figure, the coal for obtaining three computation models respectively
Body stress curve graph, sound emission figure, gas vector cloud atlas and gas flow curve graph are compared and show that surface vertical borehole is taken out
Most reasonably drill borehole bottom location when mining coal seam gas.
Secondly, after previous step determines most reasonable drilling borehole bottom location, the actual conditions at incorporation engineering scene, according to
The mathematical calculation model of the different spacings of wells of initial setting, passes through RFPA2DGas analysis version numerical value calculating obtains difference respectively
Coal bed gas extraction stress rupture figure, stress in coal bed curve graph, sound emission figure, the gas vector of spacing of wells mathematical calculation model
Cloud atlas and gas flow curve graph, are compared analysis；Drilling input cost and extracting result are comprehensively considered simultaneously, to obtain
Most reasonable spacing of wells when surface vertical borehole draining coal seam gas；The different spacing of wells ranges of choice include
30m、40m、50m、60m、70m、80m。
In step 6, judge whether computational results have reached expected reasonable result according to following standard:
Coal bed gas extraction stress rupture figure: draining coal seam gas can reduce coal seam gas-bearing capacity and gas pressure, and
Coal seam can be destroyed under the action of overburden pressure.Pass through stress rupture in observation coal bed gas extraction stress rupture figure
The size of range can be determined that whether the drilling borehole bottom location of setting and the spacing of wells are reasonable.Between reasonable borehole bottom location and drilling
It is maximum away from the stress rupture range in coal bed gas extraction stress rupture cloud atlas, entire Gas-bearing Coal Seams can be involved, without
It is only to concentrate on around drilling, i.e., should makes the coal seam between two drillings that perforation occur and destroy, utmostly reduce coal to realize
The purpose of layer gas bearing capacity and gas pressure.
Stress in coal bed curve graph: stress curve numerical value reflects the size of coal seam with gas different location stress value, rationally
Borehole bottom location and the spacing of wells stress curve extraction initial stage two drilling between coal body stress value answer it is relatively uniform, with
The increase of extraction time, peak stress are extended to two drillings are intermediate；In gas drainage mid-term stress curve, stress value should reach
It is maximum；And in the extraction later period, peak stress disappears, and coal seam with gas stress value is below a certain numerical value, and an approximate level
Straight line illustrates that the gas bearing capacity in Gas-bearing Coal Seams tends towards stability, without change dramatically.Illustrate the coalmass crevasse between two drillings
Perforation occurs to destroy.The gas bearing capacity in coal seam can be effectively reduced in such bore arrangement mode, realize good gas
Extracting result.
Sound emission figure: sound wave involves range, the i.e. spreading range in crack in sound emission figure reflection Gas-bearing Coal Seams, rationally
The sound emission of borehole bottom location and the spacing of wells be evenly distributed in entire Gas-bearing Coal Seams, illustrate the crack after gas drainage
Entire coal seam thickness can be expanded to；Rather than it is focusing only on borehole circumference or is sporadicly distributed in some position of coal seam.
Gas vector cloud atlas: gas polar plot is the trend of gas air-flow, if the gas bearing capacity in Gas-bearing Coal Seams
Bigger, intensive and coherent condition is presented in gas vector, and with the increase of extraction time, gas bearing capacity gradually decreases, and causes
Rarefaction state is presented in gas polar plot.Reasonable borehole bottom location and the gas vector of the spacing of wells should be by the concentrations at extraction initial stage point
Cloth becomes the sparse distribution in extraction later period, illustrates that the drilling borehole bottom location can play the role of reducing coal seam gas-bearing capacity, no
Severe aggregation or rarefaction state should be presented.
Gas flow curve graph: the gas flow curve presentation of reasonable borehole bottom location and the spacing of wells is the gentle stage
More, i.e., the stable extraction stage is longer, duration illustrated that this bore arrangement mode can more effectively and more fill at 10 to 14 days
Divide ground draining coal seam gas；Otherwise i.e. unreasonable, bore arrangement mode is undesirable.
The number to surface vertical borehole extraction super high seam gas is realized the invention has the following beneficial effects: the present invention
It is worth test method, makes up large-scale Physical Experiment and field test is at high cost, operation is difficult disadvantage, guarantee field ground drilling construction
Validity and reliability, be conducive to ensure mine safety production, for improve coal mine economic benefit and social benefit also have
Highly important theory significance and more practical value.
Detailed description of the invention
Fig. 1 is the flow chart of surface vertical borehole extraction super high seam gas Numerical Experimental Method of the present invention；
Fig. 2 is the schematic diagram of surface vertical borehole extraction super high seam difference borehole bottom location；
Fig. 3 is the schematic diagram of the surface vertical borehole extraction super high seam difference spacing of wells；
Fig. 4 is that RFPA is utilized in embodiment2DThe schematic diagram of boundary condition is set；
Fig. 5 is the numerical result figure that embodiment drilling borehole bottom location is located at the top of coal seam；
Fig. 6 is the numerical result figure that embodiment drilling borehole bottom location is located in the middle part of coal seam；
Fig. 7 is the numerical result figure that embodiment drilling borehole bottom location is located at bottom；
Fig. 8 is mash gas extraction current capacity contrast's curve graph when embodiment drilling borehole bottom location is located at coal seam different parts；
Fig. 9 be the embodiment spacing of wells be 50m when numerical result；
Figure 10 be the embodiment spacing of wells be 50m when stress of coal seam curve graph.
Specific embodiment
Technical solution of the present invention is further elaborated below with reference to embodiments and examples.
Specific embodiment: as shown in Figure 1, present embodiment is a kind of surface vertical borehole extraction super high seam gas
Numerical Experimental Method, comprising the following steps:
Step 1, the engineering document of surface vertical borehole extraction super high seam gas is established:
The geologic information of practical mining site is acquired, the ground of surface vertical borehole extraction super high seam gas engineering is established
Matter overview engineering document；The content of the engineering document includes working face position and well upper and lower relation, coal seam situation, gas feelings
Condition, Seam Roof And Floor situation, geological structure situation, hydrological geological conditions；
The coal seam situation includes coal seam thickness, coal bed texture, seam inclination, seam hardness, working seam, coal, steady
Determine degree, index can be adopted；
The gas situation includes coal seam gas-bearing capacity, gas pressure, gas emission；
The Seam Roof And Floor situation includes rock title, thickness, lithologic character；
The geological structure includes tomography, fold.
Step 2, the mathematical calculation model and grid dividing of surface vertical borehole extraction super high seam gas are established:
(a) mathematical calculation model of surface vertical borehole extraction super high seam gas is established:
According to the actual conditions of construction site to the construction technology of surface vertical borehole draining coal seam gas, aperture, extraction
Negative pressure, closure mode are specifically determined；Using large-scale finite element analysis computation software RFPA2DGas analyzes version, distinguishes first
Mathematical calculation model when drilling borehole bottom location is located at coal seam top, coal seam middle part and bottom is established, is calculated by numerical value
Analysis, obtains optimal drilling borehole bottom location model；Then it establishes respectively again on this basis when the borehole bottom location that drills is best
The different spacings of wells mathematical calculation model；The different spacing of wells ranges of choice include 30m, 40m, 50m, 60m,
70m,80m；
(b) grid dividing of surface vertical borehole extraction super high seam gas mathematical calculation model:
Utilize RFPA2DGas analysis version carries out carrying out grid dividing while numerical experimentation modeling, and two work are same
It is configured in a interface, the unit grid of setup algorithm model divides number, and meter according to actual needs in set interface
Calculate the actual size of model；The described actual needs include the ratio of moulded dimension and actual conditions, computer server it is interior
Deposit size and computing capability；
In fact RFPA is utilized in step 32DThe foundation for the computation model that gas analysis version software carries out and grid dividing are
It carries out simultaneously, without carrying out repetitive operation, setting steps are simple and clear, this is also RFPA2DGas analyzes the superior of version software
Property.
Step 3, the key parameter of surface vertical borehole extraction super high seam gas mathematical calculation model is determined:
According to engineering site test data and Physical Experiment Data, the key parameter of mathematical calculation model is determined, including
Homogeneity, elasticity modulus, compression strength, Poisson's ratio, porosity, internal friction angle, pressure Lapie, permeability coefficient, gas bearing capacity system
Number, gas pressure coefficient, the permeability coefficient of coup.
Step 4, the boundary condition and control condition of surface vertical borehole extraction super high seam gas are set:
To make established surface vertical borehole extraction super high seam gas difference drill between borehole bottom location and different drillings
Away from mathematical calculation model numerical experimentation can be carried out under various geological conditions, to the boundary condition and control strip of computation model
Part carries out certain setting that simplifies, specific as follows:
(1) assume that rock mechanics parameters meet Weibull distribution；
(2) rock rupture is judged using Mohr-Coulomb strength criterion；
(3) displacement constraint is used to two boundary of model, bottom boundaries use rigid constraint, either displacement constraint or rigidity
Constraint refers both to non-displacement deformation；
(4) the stratification plane of weakness small to addition elasticity modulus between rock stratum and rock stratum and stretcher strain amount, i.e., using linear
Material replaces plane of weakness between layers；
(5) rock composition for determining coal seam Lao Ding, directly top, direct bottom and past, to old top with mantlerock part, modeling
Shi Jinhang accordingly simplifies, i.e., the pressure of overlying rock is replaced using 0.25MPa/m；
(6) loading method using vertical direction from reloading, i.e., from Gas-bearing Coal Seams to old top according to the bulk density of rock into
The load of row vertical direction, overburden portion are replaced using equally distributed power straight down；
(7) pressure of gas is controlled using head in coal body, i.e. it is high that 1MPa is equal to 100m head, and goaf gas gas
Body pressure is set as 0；
(8) it despite the gas in extraction coal seam, but is to solve for type and is still considered as plane strain problems, total calculating is set
Step, and consider that Y-direction is self-possessed, unit is calculated as empty elements method, ignores the influence that Seepage flow time calculates model.
Step 5, numerical value calculates:
Utilize RFPA2DSoftware carries out numerical value calculating, the RFPA2DThe numerical procedure of gas analysis version includes answering
Power calculates analysis, Phase Transition Analysis and primitive Phase Transition Analysis.
Step 6, the computational results for analyzing surface vertical borehole extraction super high seam gas, obtain most reasonably drilling
Borehole bottom location and the most reasonable spacing of wells:
First according to the drilling borehole bottom location of foundation at the top of coal seam, in the middle part of coal seam and the numerical value of bottom calculate mould
Type passes through RFPA2DGas analysis version numerical value calculates coal bed gas extraction stress rupture figure, the coal for obtaining three computation models respectively
Body stress curve graph, sound emission figure, gas vector cloud atlas and gas flow curve graph are compared and show that surface vertical borehole is taken out
Most reasonably drill borehole bottom location when mining coal seam gas.
Secondly, after previous step determines most reasonable drilling borehole bottom location, the actual conditions at incorporation engineering scene, according to
The mathematical calculation model of the different spacings of wells of initial setting, passes through RFPA2DGas analysis version numerical value calculating obtains difference respectively
Coal bed gas extraction stress rupture figure, stress in coal bed curve graph, sound emission figure, the gas vector of spacing of wells mathematical calculation model
Cloud atlas and gas flow curve graph, are compared analysis；Drilling input cost and extracting result are comprehensively considered simultaneously, to obtain
Most reasonable spacing of wells when surface vertical borehole draining coal seam gas；The different spacing of wells ranges of choice include
30m、40m、50m、60m、70m、80m。
In step 6, judge whether computational results have reached expected reasonable result according to following standard:
Coal bed gas extraction stress rupture figure: draining coal seam gas can reduce coal seam gas-bearing capacity and gas pressure, and
Coal seam can be destroyed under the action of overburden pressure.Pass through stress rupture in observation coal bed gas extraction stress rupture figure
The size of range can be determined that whether the drilling borehole bottom location of setting and the spacing of wells are reasonable.Between reasonable borehole bottom location and drilling
It is maximum away from the stress rupture range in coal bed gas extraction stress rupture cloud atlas, entire Gas-bearing Coal Seams can be involved, without
It is only to concentrate on around drilling, i.e., should makes the coal seam between two drillings that perforation occur and destroy, utmostly reduce coal to realize
The purpose of layer gas bearing capacity and gas pressure.
Stress in coal bed curve graph: stress curve numerical value reflects the size of coal seam with gas different location stress value, rationally
Borehole bottom location and the spacing of wells stress curve extraction initial stage two drilling between coal body stress value answer it is relatively uniform, with
The increase of extraction time, peak stress are extended to two drillings are intermediate；In gas drainage mid-term stress curve, stress value should reach
It is maximum；And in the extraction later period, peak stress disappears, and coal seam with gas stress value is below a certain numerical value, and an approximate level
Straight line illustrates that the gas bearing capacity in Gas-bearing Coal Seams tends towards stability, without change dramatically.Illustrate the coalmass crevasse between two drillings
Perforation occurs to destroy.The gas bearing capacity in coal seam can be effectively reduced in such bore arrangement mode, realize good gas
Extracting result.
Sound emission figure: sound wave involves range, the i.e. spreading range in crack in sound emission figure reflection Gas-bearing Coal Seams, rationally
The sound emission of borehole bottom location and the spacing of wells be evenly distributed in entire Gas-bearing Coal Seams, illustrate the crack after gas drainage
Entire coal seam thickness can be expanded to；Rather than it is focusing only on borehole circumference or is sporadicly distributed in some position of coal seam.
Gas vector cloud atlas: gas polar plot is the trend of gas air-flow, if the gas bearing capacity in Gas-bearing Coal Seams
Bigger, intensive and coherent condition is presented in gas vector, and with the increase of extraction time, gas bearing capacity gradually decreases, and causes
Rarefaction state is presented in gas polar plot.Reasonable borehole bottom location and the gas vector of the spacing of wells should be by the concentrations at extraction initial stage point
Cloth becomes the sparse distribution in extraction later period, illustrates that the drilling borehole bottom location can play the role of reducing coal seam gas-bearing capacity, no
Severe aggregation or rarefaction state should be presented.
Gas flow curve graph: the gas flow curve presentation of reasonable borehole bottom location and the spacing of wells is the gentle stage
More, i.e., the stable extraction stage is longer, duration illustrated that this bore arrangement mode can more effectively and more fill at 10 to 14 days
Divide ground draining coal seam gas；Otherwise i.e. unreasonable, bore arrangement mode is undesirable.
Embodiment:
The present embodiment carries out surface vertical borehole extraction super high seam gas numerical experimentation to 8101 working face of Tashan Mountain coal mine.
Step 1, the engineering document of surface vertical borehole extraction super high seam gas is established:
8101 working face of area of Tong coal corporation in Shanxi group Tashan Mountain coal mine is located at a panel east, northern neighbouring seven peak mountain coal mines, south with
1070 air return lanes are boundary, and 1070 belt lane of connection, the lane Fu Yun, western part is 8102 goafs, and east is the area Shi Mei；8101 working faces
Strike length is 1445m, and tilt length 231.4m, working seam is the coal seam 3#~5#, and average coal seam thickness is 20.08m, is belonged to
Super high seam, from mine experience with mining over the years and Gas explosion burns measurement result: 3#~5# coal seam gas-bearing capacity average out to
1.78m3/ t, original gas pressure average out to 0.2MPa, Permeability Coefficent in Coal Seam are 171.71~428.8m2·MPa-2·d-1；
Working face is adjacent with 8102 goafs, coal column 8m；The working face was produced as a trial on November 15th, 2016, by the end of 2016
On November 24, in, working face head promote 25m, and tail promotes 34m.
It mainly includes the sum of mined bed, adjacent layer and country rock gas emission three that 8101 face gas, which are gushed out,.Normally
In the case of, the absolute gas emission rate of 8101 working faces is 25-35m3/ min encounters tomography, coal body during the advance of the face
When being crushed equal regions, gas emission is significantly increased, it is contemplated that 8101 working face absolute gas emission rates are up to 40m3/ min with
On；8101 working face relative abundance of methane 2.25m3/ t, wherein mined bed is 1.5m3/ t, upper contiguous seam and country rock are
0.75m3/t.8101 face gas administer general thought: taking based on being arranged by wind, it is main that hole extraction is vertically stood with ground
Means using upper corner pipe laying extraction cooperating face faces end head plugging, just adopt the measures such as hydrofracturing as supplementary means.
Step 2, the mathematical calculation model and grid dividing of surface vertical borehole extraction super high seam gas are established:
According to the actual conditions of construction site to the construction technology of surface vertical borehole draining coal seam gas, aperture, extraction
Negative pressure, closure mode etc. are specifically determined；Using large-scale finite element analysis computation software RFPA2DGas analyzes version, divides first
The borehole bottom location that Jian Li not drill is located at mathematical calculation model when coal seam top, coal seam middle part and bottom, as shown in Fig. 2,
Black layer is exactly coal seam；By numerical Analysis, show that optimal drilling borehole bottom location is to be located at bottom, then herein
On the basis of establish respectively again when drill borehole bottom location be located at bottom when the different spacings of wells (be followed successively by from small to large 40m,
50m, 60m) mathematical calculation model, as shown in Figure 3.Numerical model is analyzed using two dimensional plane strain, and three different drillings are eventually
The size of hole site mathematical calculation model is disposed as 50 × 100m, divides 100 × 200=20000 unit, each unit generation
Table 0.5m；The size of three different spacing of wells mathematical calculation models is disposed as 210 × 100m, divides 420 × 200=
84000 units, each unit represent 0.5m.
Step 3, the key parameter of surface vertical borehole extraction super high seam gas mathematical calculation model is determined:
According to engineering site test data or Physical Experiment Data, obtains the key parameter of mathematical calculation model, be shown in Table
1。
Table 1
Step 4, the boundary condition and control condition of surface vertical borehole extraction super high seam gas are set:
According to the physical resource of mining site, the rock composition of coal seam Lao Ding, directly top, direct bottom and past are determined, to old top
With mantlerock part, when modeling, is accordingly simplified, i.e., the pressure of overlying rock is replaced using 0.25MPa/m；To rock stratum and rock
It is added elasticity modulus and the small stratification plane of weakness of stretcher strain amount between layer, i.e., between layers weak is replaced using linear material
Face；Displacement constraint is used to two boundary of model, bottom boundaries use rigid constraint, and either displacement constraint or rigid constraint refers both to
Non-displacement deformation；Loading method is using vertical direction from reloading, i.e., Gas-bearing Coal Seams to old top are carried out according to the bulk density of rock
Vertical direction load, overburden portion are replaced using equally distributed power straight down；It is assumed that rock mechanics parameters meet
Weibull distribution, rock rupture are judged using Mohr-Coulomb strength criterion.
The up-and-down boundary of model is airtight rock stratum, i.e., the gas flow of rock stratum is 0 up and down, right boundary methane gas pressure
Power is 0.2MPa；Its primary condition are as follows: at the t=0 moment, methane gas pressure is 0.2MPa in coal seam.
According to engineering site test and Physical Experiment Data, the gas porous flow boundary condition of computation model is configured,
As shown in Figure 4.Scribe area is main setting parameter in Fig. 4, and wherein Heterogeneity is homogeneity, corresponding Weibull system
The parameter m in distribution function is counted, reflects the homogenieity of rock medium；Average Value is unit physical and mechanical parameter (such as bullet
Property modulus, intensity, Poisson's ratio, bulk density etc.) average value；Gas pressure is generally carried out using WaterHead on two boundary of coal seam
Control setting.
It drills borehole bottom location and the different spacings of wells in the surface vertical borehole extraction super high seam gas difference of foundation
Above-mentioned boundary condition and control condition are all made of in mathematical calculation model.
Step 5, numerical value calculates:
It drills borehole bottom location and the different spacings of wells in the surface vertical borehole extraction super high seam gas difference of foundation
In mathematical calculation model, total calculating step number is set as 200 steps, and is Seepage problems.Each computation model is all made of continuously
It calculates, failure criteria is all made of mole coulomb criterion in rock mechanics, is all made of Weibull statistical distribution functions to describe gas
Admittedly the breakoff phenomenon coupled.
Step 6, the computational results for analyzing surface vertical borehole extraction super high seam gas, obtain most reasonably drilling
Borehole bottom location and the most reasonable spacing of wells:
(1) numerical result of different drilling borehole bottom locations is analyzed
Numerical result such as Fig. 5 when surface vertical borehole borehole bottom location is located at Gas-bearing Coal Seams different parts extremely schemes
Shown in 7, wherein 1,4,7 refer to sound emission figure, 2,5,8 refer to gas polar plot, and 3,6,9 refer to stress rupture figure.Mash gas extraction flow pair
It is more as shown in Figure 8 than curve.
Comprehensive Correlation Fig. 5,6,7 can find that drilling borehole bottom location is arranged in stress rupture model when Gas-bearing Coal Seams bottom
Maximum is enclosed, entire Gas-bearing Coal Seams can be involved；And the stress rupture range at the top of coal seam and when middle part only concentrates on drilling
Surrounding and coal seam middle and upper part influence the extraction of Gas-bearing Coal Seams bottom smaller.In addition, sound emission is distributed in entirely in Fig. 7
In Gas-bearing Coal Seams, illustrate that crack can expand to entire coal seam thickness after gas drainage；And sound emission is only concentrated in Fig. 5
Sound emission can be distributed in Gas-bearing Coal Seams in borehole circumference, Fig. 6, but only sporadicly be distributed in bottom.It is sweared from gas
It can also be seen that, gas vector is in substantially always sparse horizontal distribution in Fig. 5 in spirogram, illustrates the drilling terminal location extraction
Gas out is less, and extracting result is very unsatisfactory；The distribution of gas vector is very intensive always in Fig. 6, and arrow intensively occurs, and says
The gas amount that the bright drilling terminal location extraction comes out is larger always, has certain effect for reducing the gas bearing capacity in coal seam
Fruit, but unobvious, because coal-bed gas vector still gathers appearance, gas bearing capacity or larger in coal seam；And gas in Fig. 7
Vector is become the sparse distribution in extraction later period from the integrated distribution at extraction initial stage, illustrates that the drilling borehole bottom location can play reduction
The effect of coal seam gas-bearing capacity, so that the gas bearing capacity in coal seam is from large to small, extracting result is obvious.
Three gas flow curves can be found in Comprehensive Correlation Fig. 8, and when drilling borehole bottom location is located at the top of coal seam, gas is taken out
The amount of adopting is not achieved calculating and requires, and flow curve is more gentle；And whole hole is when being located at coal seam middle part, although maximum value reaches meter
It calculates and requires, but the stabilization sub stage of flow curve is shorter, illustrates that extracting result is undesirable；When whole hole is located at bottom, gas
What flow curve was presented is that the gentle stage is more, i.e., the stable extraction stage is longer, illustrates that this bore arrangement mode can more have
Effect and more fully draining coal seam gas.
It can to sum up obtain, when the borehole bottom location that drills is located at Gas-bearing Coal Seams different parts, different journeys can occur for coal seam
The destruction of degree occurs to destroy most serious wherein drilling borehole bottom location is located at bottom, and the sound emission in coal seam also can almost involve
Entire coal seam, gas vector sum mash gas extraction flow curve variation tendency is reasonable, can maximum draining coal seam gas, take out
It is preferable to adopt effect.Accordingly, it is determined that it is more reasonable that the borehole bottom location of surface vertical borehole is arranged in Gas-bearing Coal Seams bottom.
(2) numerical result of the different spacings of wells is analyzed
Using RFPA2DGas analyzes version software to three kinds of different drillings when surface drilling borehole bottom location is located at bottom
Stress rupture, sound emission and gas vector in the case of spacing (40m, 50m, 60m) carry out numerical Analysis.By to score
Analysis discovery, when the spacing of wells is 40m and 50m, destructive perforation can occur for the coalmass crevasse between two drillings, and extracting result is bright
It is aobvious；When the spacing of wells is 60m, the coalmass crevasse between two drillings has been able to that perforation handover occurs, but destructiveness cannot occur
Perforation, extracting result be not fairly obvious.And when the spacing of wells is 40m, entire coal mine drilling arranges excessively intensive, construction cost
It can greatly increase.So on the basis of comprehensively considering drilling input cost and extracting result, it is final to determine that the spacing of wells is
50m is more reasonable.Stress rupture, sound emission and gas vector complex chart when the spacing of wells is 50m as shown in Figure 9 wherein, 10
Refer to sound emission figure, 11 refer to gas polar plot, and 12 refer to stress rupture figure, the stress of coal seam curve such as Figure 10 in different gas drainage stages
It is shown.
In conjunction with 8101 surface drilling mash gas extraction practical application effect of tunnel passing through solution cavity in Taishan mine, the invention will be further described.
1, drilling hole amount and the spacing of wells
According to above-mentioned numerical experimentation optimization analysis as a result, in conjunction with related round section joint ring correlation theory and tunnel passing through solution cavity in Taishan mine actual conditions,
Consider first weighting simultaneously and stop adopting not putting the influence of the factors such as coal, 8101 working face surface vertical borehole extractions are total to design arrangement 31
A drilling, moving towards direction arrangement spacing along working face is 50m, and the later period is reasonably adjusted according to face gas improvement situation between arrangement
Away from.During normal back production, 3~5 drilling extractions simultaneously are opened.Stop extraction when drilling into goaf 100m~120m,
Extraction is opened when drilling is located at release drainage away from working face 30m~40m.In drainage pump Selection utilization ground region gas pump station
2BEC87 type water ring vacuum pump, it is single to pump specified extraction ability as 735m3/min.Extraction main line is DN600 pipeline, extraction branch pipe
Road is DN300 pipeline.
2, hole structure
The vertical firedamp taking-out discharging drilling effective aperture in 8101 working face ground of tunnel passing through solution cavity in Taishan mine is 311mm, and wherein 0m~120m drills
Aperture is 425mm, lower ф 355 × 10mm casing, and 120m~end hole point (away from the coal seam 3#~5# 2m or 5m) is open-hole.
3,8101 working face surface drilling mash gas extraction effect analyses
According to tunnel passing through solution cavity in Taishan mine in-situ data, it is vertical that 8101 working faces on November 15th, 2016 start with ground 0#, 1#, 2#
Extraction is implemented in drilling, and by the end of on November 25th, 2016, extraction main pipe rail gas density was between 0.122%~2.154%, work
Making face absolute gas emission rate is 5.656m3/ min~10.23m3/ min, wherein the upper corner pipe laying scale that draws out methane be
0.59m3/ min~0.64m3/ min accounts for the 6.21%~9.01% of total amount；The surface vertical borehole scale that draws out methane daily is
2.09m3/ min~6.18m3/ min accounts for the 42.94%~60.22% of total amount；System wind resource assessment scale is 2.81m3/ min~
3.43m3/ min accounts for the 33.53%~48.05% of total amount.Three surface drilling gas drainage under suction same day cumulants having turned on exist
3013m3~8892m3Between, average every hole same day pumping volume is in 1004m3~2964m3Between, three holes add up extraction total amount
51165.6m3。
As seen through the above analysis, 8101 working face surface vertical borehole mash gas extraction of tunnel passing through solution cavity in Taishan mine works well, can
To continue to promote and apply in gas discharge in mine work.
Finally, it should be noted that embodiment of above and embodiment are merely illustrative of the technical solution of the present invention, rather than it is right
It is limited；Although referring to aforementioned embodiments or embodiment, invention is explained in detail, the ordinary skill of this field
Personnel are it is understood that it can still modify to technical solution documented by aforementioned embodiments and embodiment or right
Part of technical characteristic is equivalently replaced；And these are modified or replaceed, it does not separate the essence of the corresponding technical solution
The spirit and scope of each embodiment of the present invention or embodiment technical solution.
Claims (8)
1. a kind of Numerical Experimental Method of surface vertical borehole extraction super high seam gas, which comprises the following steps:
Step 1, the engineering document of surface vertical borehole extraction super high seam gas is established；
Step 2, the mathematical calculation model and grid dividing of surface vertical borehole extraction super high seam gas are established；
Step 3, the key parameter of surface vertical borehole extraction super high seam gas mathematical calculation model is determined；
Step 4, the boundary condition and control condition of surface vertical borehole extraction super high seam gas are set；
Step 5, numerical value calculates；
Step 6, the computational results for analyzing surface vertical borehole extraction super high seam gas, obtain the whole hole that most reasonably drills
Position and the most reasonable spacing of wells.
2. a kind of Numerical Experimental Method of surface vertical borehole extraction super high seam gas according to claim 1, special
Sign is that the step 1 specifically includes:
The geologic information of practical mining site is acquired, the geology for establishing surface vertical borehole extraction super high seam gas engineering is general
Condition engineering document；The content of the engineering document includes working face position and well upper and lower relation, coal seam situation, gas situation, coal
Layer roof and floor situation, geological structure situation, hydrological geological conditions；
The coal seam situation includes coal seam thickness, coal bed texture, seam inclination, seam hardness, working seam, coal, stablizes journey
Degree can adopt index；
The gas situation includes coal seam gas-bearing capacity, gas pressure, gas emission；
The Seam Roof And Floor situation includes rock title, thickness, lithologic character；
The geological structure includes tomography, fold.
3. a kind of Numerical Experimental Method of surface vertical borehole extraction super high seam gas according to claim 2, special
Sign is that the step 2 specifically includes:
(a) mathematical calculation model of surface vertical borehole extraction super high seam gas is established:
According to the actual conditions of construction site to the construction technology of surface vertical borehole draining coal seam gas, aperture, extraction negative pressure,
Closure mode is specifically determined；Using large-scale finite element analysis computation software --- gas coal rock rupture process analyzes software,
It establishes mathematical calculation model when drilling borehole bottom location is located at coal seam top, coal seam middle part and bottom respectively first, passes through
Numerical Analysis obtains optimal drilling borehole bottom location model；Then it is established respectively again when the whole hole location that drills on this basis
The mathematical calculation model of different spacings of wells when setting best；The different spacing of wells ranges of choice include 30m, 40m,
50m,60m,70m,80m；
(b) grid dividing of surface vertical borehole extraction super high seam gas mathematical calculation model:
Grid dividing is carried out while carrying out numerical experimentation modeling using gas coal rock rupture process analysis software, two work exist
It being configured in the same interface, the unit grid of setup algorithm model divides number according to actual needs in set interface,
With the actual size of computation model；The actual needs includes ratio, the computer server of moulded dimension and actual conditions
Memory size and computing capability.
4. a kind of Numerical Experimental Method of surface vertical borehole extraction super high seam gas according to claim 3, special
Sign is that the step 3 specifically includes:
According to engineering site test data and Physical Experiment Data, the key parameter of mathematical calculation model, including homogeneous are determined
Degree, elasticity modulus, compression strength, Poisson's ratio, porosity, internal friction angle, pressure Lapie, permeability coefficient, gas bearing capacity coefficient, watt
This pressure coefficient, the permeability coefficient of coup.
5. a kind of Numerical Experimental Method of surface vertical borehole extraction super high seam gas according to claim 4, special
Sign is that the step 4 specifically includes:
To make established surface vertical borehole extraction super high seam gas difference drilling borehole bottom location and the different spacings of wells
Mathematical calculation model can carry out numerical experimentation under various geological conditions, the boundary condition and control condition to computation model into
Row simplifies setting, specific as follows:
(1) assume that rock mechanics parameters meet Weibull distribution；
(2) rock rupture is judged using Mohr-Coulomb strength criterion；
(3) displacement constraint is used to two boundary of model, bottom boundaries use rigid constraint, either displacement constraint or rigid constraint
Refer both to non-displacement deformation；
(4) the stratification plane of weakness small to addition elasticity modulus between rock stratum and rock stratum and stretcher strain amount, that is, use linear material
Instead of plane of weakness between layers；
(5) rock composition for determining coal seam Lao Ding, directly top, direct bottom and past, to old top with mantlerock part, when modeling into
Row is corresponding to be simplified, i.e., the pressure of overlying rock is replaced using 0.25MPa/m；
(6) loading method is erected from Gas-bearing Coal Seams to old top according to the bulk density of rock using vertical direction from reloading
Histogram is replaced to load, overburden portion using equally distributed power straight down；
(7) pressure of gas is controlled using head in coal body, i.e. it is high that 1MPa is equal to 100m head, and goaf gas gas pressure
Power is set as 0；
(8) it despite the gas in extraction coal seam, but is to solve for type and is still considered as plane strain problems, total calculating step is set,
And considering that Y-direction is self-possessed, unit is calculated as empty elements method, ignores the influence that Seepage flow time calculates model.
6. a kind of Numerical Experimental Method of surface vertical borehole extraction super high seam gas according to claim 5, special
Sign is that the step 5 specifically includes:
Numerical value calculating is carried out using gas coal rock rupture process analysis software, the gas coal rock rupture process analysis software
Numerical procedure includes Stress calculation analysis, Phase Transition Analysis and primitive Phase Transition Analysis.
7. a kind of Numerical Experimental Method of surface vertical borehole extraction super high seam gas according to claim 6, special
Sign is that the step 6 specifically includes:
First according to the drilling borehole bottom location of foundation at the top of coal seam, in the middle part of coal seam and the mathematical calculation model of bottom, lead to
It crosses gas coal rock rupture process analysis software numerical value and calculates the coal bed gas extraction stress rupture for obtaining three computation models respectively
Figure, stress in coal bed curve graph, sound emission figure, gas vector cloud atlas and gas flow curve graph, are compared and show that ground is vertical
Most reasonably drill borehole bottom location when hole pumping and mining coal-bed gas；
Secondly, after previous step determines most reasonable drilling borehole bottom location, the actual conditions at incorporation engineering scene, according to preliminary
The mathematical calculation model of the different spacings of wells of setting is analyzed software numerical value calculating by gas coal rock rupture process and is obtained respectively
Coal bed gas extraction stress rupture figure, stress in coal bed curve graph, the sound emission figure, gas of different spacing of wells mathematical calculation models
Vector cloud atlas and gas flow curve graph, are compared analysis；Drilling input cost and extracting result are comprehensively considered simultaneously, thus
Obtain most reasonable spacing of wells when surface vertical borehole draining coal seam gas；The different spacing of wells range of choice packets
Include 30m, 40m, 50m, 60m, 70m, 80m.
8. a kind of Numerical Experimental Method of surface vertical borehole extraction super high seam gas according to claim 7, described
Step 6 in, judge whether computational results have reached expected reasonable result according to following standard:
Coal bed gas extraction stress rupture figure: the stress rupture that the stress rupture under reasonable borehole bottom location and the spacing of wells is tried hard to
Range is maximum, can involve entire Gas-bearing Coal Seams, rather than only concentrates on around drilling, i.e., should make the coal between two drillings
Perforation, which occurs, for layer destroys, to realize the purpose for utmostly reducing coal seam gas-bearing capacity and gas pressure；
Stress in coal bed curve graph: the reasonably coal between the drilling of extraction initial stage two of the stress curve under borehole bottom location and the spacing of wells
The stress value of body is answered relatively uniform, and with the increase of extraction time, peak stress is to the intermediate extension of two drillings；In gas drainage
In phase stress curve, stress value should reach maximum；And in the extraction later period, peak stress disappears, and coal seam with gas stress value is low
In same numerical value, and an approximate horizontal linear, show that the coalmass crevasse between two drillings occurs perforation and destroys, such drilling
The gas bearing capacity in coal seam can be effectively reduced in arrangement, realize good gas pumping effect；
Sound emission figure: the sound emission under reasonable borehole bottom location and the spacing of wells is evenly distributed in entire Gas-bearing Coal Seams, is said
The bright crack after gas drainage can expand to entire coal seam thickness；Rather than it is focusing only on borehole circumference or is sporadicly distributed in
Some position of coal seam；
Gas vector cloud atlas: the gas vector under reasonable borehole bottom location and the spacing of wells should be big by the gas bearing capacity at extraction initial stage
And integrated distribution become the extraction later period gas bearing capacity is small and sparse distribution, illustrate that the drilling borehole bottom location can play reduction coal
The effect of layer gas bearing capacity, will not be presented Severe aggregation or rarefaction state；
Gas flow curve graph: what the gas flow curve under reasonable borehole bottom location and the spacing of wells was presented is the gentle stage to be
Main, i.e., based on the stable extraction stage, duration showed that this bore arrangement mode being capable of effective fully extraction coal at 10 to 14 days
Layer gas；Otherwise i.e. unreasonable, bore arrangement mode is undesirable.
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