CN106223995B - Down-hole coal bed region gas pumping effect analysis method based on monitoring historical data - Google Patents
Down-hole coal bed region gas pumping effect analysis method based on monitoring historical data Download PDFInfo
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- CN106223995B CN106223995B CN201610724582.7A CN201610724582A CN106223995B CN 106223995 B CN106223995 B CN 106223995B CN 201610724582 A CN201610724582 A CN 201610724582A CN 106223995 B CN106223995 B CN 106223995B
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- 239000003245 coal Substances 0.000 title claims abstract description 60
- 238000005086 pumping Methods 0.000 title claims abstract description 44
- 230000000694 effects Effects 0.000 title claims abstract description 41
- 238000012544 monitoring process Methods 0.000 title claims abstract description 33
- 238000004458 analytical method Methods 0.000 title claims abstract description 18
- 238000000605 extraction Methods 0.000 claims abstract description 62
- 238000005553 drilling Methods 0.000 claims abstract description 34
- 230000000153 supplemental effect Effects 0.000 claims abstract description 9
- 230000004907 flux Effects 0.000 claims description 6
- 238000011156 evaluation Methods 0.000 claims description 4
- 238000005065 mining Methods 0.000 claims description 4
- 238000005259 measurement Methods 0.000 claims description 2
- 238000011161 development Methods 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 235000013399 edible fruits Nutrition 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012067 mathematical method Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
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- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
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- Sampling And Sample Adjustment (AREA)
- Management, Administration, Business Operations System, And Electronic Commerce (AREA)
Abstract
Down-hole coal bed gas pumping effect analysis method in region provided by the invention based on monitoring historical data, if according to adjacent position and connecing the mash gas pumping drilling in coal seam to find time and being divided into dry hole control area including a., b. the extraction borehole in same control area is accessed into same drilling collector-shoe gear, the drilling collector-shoe gear is connect with gas pumping pipeline, c. it acquires the gas drainage supplemental characteristic of the pipeline between drilling collector-shoe gear and gas pumping pipeline and records, d. according to the gas drainage supplemental characteristic of acquisition, obtain gas drainage unit cumulant, and gas pumping effect is evaluated and is predicted；Analysis result of the invention more intuitively reflects the variation dynamic of coal bed gas extraction effect than monitoring data and development trend, the result of prediction improve the forecasting accuracy of gas pumping effect closer to time of day.
Description
Technical field
The present invention relates to underground coal mine monitoring technical field more particularly to it is a kind of based on monitoring historical data it is down-hole coal bed
Region gas pumping effect analysis method.
Background technique
Down-hole coal bed gas drainage is prevention and treatment high methane and projecting mine the coal and gas prominent accident in mining process
One of technical way.Mine, which passes through construction coal mash gas pumping drilling and is laid with gas pipeline, forms underground gas extraction pipe
The gas of preservation in coal seam is extracted out and is delivered to ground by net.To guarantee that the prominent hidden danger of coal-bed gas reduces in controlled range,
Mine must by digging coal seam gas bearing capacity and pressure extraction reduce in target value hereinafter, i.e. realize extraction it is up to standard, " coal mine
Gas drainage temporary provisions up to standard " (safety supervision total coal fill (2011) No. 163) carried out detailed regulation to this.Therefore, mine coal
The quality of layer gas pumping effect is directly related to coal bed gas extraction progress speed up to standard, and then affects coal mine excavation and be
It is no smoothly to take over.
Therefore, coal bed gas extraction live effect in specific region and its development trend in time and are accurately grasped for mine
The production deployment of well is most important, in order to monitor the operation conditions of coal mine gas extraction pipe network and the extraction effect of coal-bed gas
Fruit must carry out the real time measure to the gas parameter in extraction pipe network.Usually by the way that monitoring point is arranged on extraction pipeline, install
Gas drainage monitors terminal, and the modes such as methane concentration, flow, the pressure and temperature of real-time monitoring extraction gas in pipelines carry out
Monitoring.
But existing monitoring system generally can only gas concentration, wink in automatic, real-time monitoring gas pumping pipeline at present
Shi Liuliang, integrated flow, pressure and temperature do not have the function of being analyzed extracting result, can not intuitively reflect coal seam
The development tendency of gas pumping effect.Although field technician can use the side of manual analysis to above-mentioned monitoring data
Formula obtains the various indexs of reflection gas pumping effect, but this mode requires height, and efficiency to the technical level of Field Force
Slowly, it is unfavorable for the smooth timely development of extracting result appraisal, therefore, needs a kind of new technological means, it is existing to solve
Extraction monitoring data the technical issues of can not intuitively reflecting gas pumping effect.
Summary of the invention
In view of this, the present invention provides a kind of down-hole coal bed region gas pumping effect analysis based on monitoring historical data
Method, to solve the technical issues of existing extraction monitoring data can not intuitively reflect gas pumping effect.
Down-hole coal bed gas pumping effect analysis method in region provided by the invention based on monitoring historical data, comprising:
If a. according to adjacent position and connecing the mash gas pumping drilling in coal seam to find time and being divided into dry hole control area,
B. the extraction borehole in same control area is accessed into same drilling collector-shoe gear, the drilling collector-shoe gear and watt
The connection of this extraction pipeline,
C. it acquires the gas drainage supplemental characteristic of the pipeline between drilling collector-shoe gear and gas pumping pipeline and records,
D. according to the gas drainage supplemental characteristic of acquisition, gas drainage unit cumulant is obtained, and to gas pumping effect
It is predicted.
Further, gas drainage parameter includes gas extraction flow, gas density, gas pressure and record time, interval
The gas drainage parameter in control area is measured, gas drainage unit cumulant is obtained by following formula:
Wherein, qi is gas extraction flow, and Δ t is interval time, and Qi is gas drainage unit cumulant.
Further, the gas drainage unit cumulant for continuously acquiring the different time stage, after the n Δ t time of experience
Gas drainage unit cumulant the coal bed gas extraction effect in the control area is evaluated.
Further, pass through the gas remainder quantity W of control area gas pre-drainage rate γ and control area coalcy, to control zone
Coal bed gas extraction effect in domain is evaluated；
The control area gas pre-drainage rate γ is obtained by following formula:
Wherein, QzFor the gas gross reserves in the control area, Qn is the gas drainage list by n time interval Δ t
First cumulant.
The gas remainder quantity W of control area coalcyIt is obtained by following formula:
Wherein, L is control area bearing length, m；L is interior coal seam average propensity length in control area, m；M is
Control area is averaged coal seam thickness, m；ρ is the density of evaluation unit coal, t/m3, W0For the original gas bearing capacity of control area coal,
m3/t。
It further, is in the decaying of negative exponential function form with the extension of extraction time according to drilling gas extraction flow, it will
The historical data of the gas drainage parameter of monitoring carries out numerical fitting, obtains mash gas extraction flux depression coefficient and regression coefficient.
Further, the following gas pumping effect sometime is predicted by following formula:
Wherein, QT is the gas drainage cumulant of the following sometime T, and c0 is the initial mash gas extraction concentration that drills, ct t
Moment hole pumping and mining gas density, q0 are the initial gas drainage amount that drills, and b is regression coefficient, and P0 is the initial gas pressure in coal seam,
Pt is the coal-bed gas pressure of t moment, and β is mash gas extraction flux depression coefficient, and t is the extraction moment.
Beneficial effects of the present invention: the down-hole coal bed region gas drainage effect provided by the invention based on monitoring historical data
Fruit analysis method, analysis result more intuitively reflect the variation dynamic and hair of coal bed gas extraction effect than monitoring data
Exhibition trend；Extracting result prediction technique considers the variation of mash gas extraction concentration and coal-bed gas pressure simultaneously, makes the knot of prediction
Fruit is closer to time of day, to improve the forecasting accuracy of gas pumping effect, effectively may be used for coal mine technical staff
The extracting result analysis leaned on provides the foundation.
Detailed description of the invention
The invention will be further described with reference to the accompanying drawings and examples:
Fig. 1 is the principle of the present invention schematic diagram.
Fig. 2 is structural schematic diagram of the invention.
Specific embodiment
The invention will be further described with reference to the accompanying drawings and examples: Fig. 1 is the principle of the present invention schematic diagram, Fig. 2
It is structural schematic diagram of the invention.
As shown in Figure 1, the down-hole coal bed region gas pumping effect analysis based on monitoring historical data in the present embodiment
Method, including
If a. according to adjacent position and connecing the mash gas pumping drilling in coal seam to find time and being divided into dry hole control area,
B. the extraction borehole in same control area is accessed into same drilling collector-shoe gear, the drilling collector-shoe gear and watt
The connection of this extraction pipeline,
C. it acquires the gas drainage supplemental characteristic of the pipeline between drilling collector-shoe gear and gas pumping pipeline and records,
D. according to the gas drainage supplemental characteristic of acquisition, gas drainage unit cumulant is obtained, and to gas pumping effect
It is evaluated and is predicted.
As shown in Fig. 2, find time according to 4 adjacent position of mash gas pumping drilling and connecing, will be changed in coal seam be divided into it is multiple adjacent
Drilling control area 5, then same drilling confluence will be accessed in the mash gas pumping drilling 4 in same drilling control area 5
Device 3, drilling collector-shoe gear 3 are connected with gas pumping pipeline 1 is connect, and each drilling collector-shoe gear 3 installs extraction parameter monitoring
Sensor 2, extraction parameter monitoring sensor 2 can between at regular intervals Δ t measure the gas drainage in the drilling control area 5
Flow extraction flow qi, gas density ci, gas pressure pi, i=0,1,2 ..., n, and by time of measuring and corresponding measurement number
According to being recorded, in the present embodiment, the effect for the collector-shoe gear that drills be by it is same drilling control area in difference drill into
Row convergence carries out unified monitoring to the gas drainage parameter in the drilling control area by extraction parameter monitoring sensor 2, this
Field technical staff could be aware that, the extraction parameter monitoring sensor 2 in the present embodiment can use it is in the prior art can be with
It acquires this extraction flow extraction flow, gas density, gas pressure and sensor to be substituted, then this is repeated no more.
It in the present embodiment, is (q by the data preparation of preservation when recording extraction supplemental characteristici, ci, pi, ti) format
Monitoring history data set, Δ t carries out the calculating of a gas drainage unit cumulant Qi at regular intervals,
Δ t indicates interval time, and wherein Δ t is smaller, gas drainage unit cumulant QiPrecision is higher.
The gas drainage unit cumulant for continuously acquiring the different time stage is taken out according to the gas after the n Δ t time of experience
Unit cumulant is adopted to evaluate the coal bed gas extraction effect in the control area, after a stage, phases-time
For n Δ t, gas drainage total accumulation Qn:
The gas pre-drainage rate γ of drilling control area 5:
In formula, QzFor the gas gross reserves in the control area.
The gas gross reserves Q of drilling control area 5z:
Qz=L × l × m × ρ × W0 (4)
L-control area bearing length, m in formula；Interior coal seam average propensity length, m in l-control area；M-control
Region processed is averaged coal seam thickness, m；ρ-evaluation unit coal density, t/m3, W0The original gas bearing capacity of-control area coal,
m3/t。
The gas remainder quantity W of control area 5cy:
Control area gas pre-drainage rate γ and gas remainder quantity Wcy, as evaluation is by a stage, that is, n Δ t time
The coal bed gas extraction effect of drilling control area 5 afterwards.
The present embodiment, with the decaying of extraction time extended in negative exponential function form, is incited somebody to action according to drilling gas extraction flow
The historical data of the gas drainage parameter of monitoring carries out numerical fitting, obtains mash gas extraction flux depression coefficient and regression coefficient,
According to GAS Flow Theory in Coal Seam, drilling gas extraction flow when extraction t moment is expressed with following formula:
In formula, qtFor the gas drainage amount of t moment, m3/min；c0For the initial mash gas extraction concentration that drills, %；ctWhen for t
Carve hole pumping and mining gas density, %；q0For the initial gas drainage amount that drills, m3/min；B is regression coefficient；P0For initial watt of coal seam
This pressure, MPa；Pt is the coal-bed gas pressure of t moment, MPa；β is mash gas extraction flux depression coefficient, d-1；When t is extraction
It carves, d.
(the q that will be obtainedi, ci, pi, ti) format monitoring history data set, can be obtained using the mathematical method of numerical fitting
To the value of b and β, thus predictable future next stage sometime t when gas extraction flow.
Gas drainage total accumulation Q when future time instance TT:
After obtaining formula (6) and (7), the calculating of extracting result prediction index can be carried out, such as gas drainage always adds up
Time needed for amount QT reaches some setting value etc..After the effect assessment and prediction that have so carried out a stage, that is, it is transferred to down
Data monitoring, effect assessment and the prediction in one stage.
Gas pumping effect analysis method in the present embodiment can carry out down-hole coal bed region gas pumping effect fast
Speed analysis, due to also contemplating the variation of mash gas extraction concentration and coal-bed gas pressure in predictor formula, can be effective
Improve the forecasting accuracy of gas pumping effect.
Finally, it is stated that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting, although referring to compared with
Good embodiment describes the invention in detail, those skilled in the art should understand that, it can be to skill of the invention
Art scheme is modified or replaced equivalently, and without departing from the objective and range of technical solution of the present invention, should all be covered at this
In the scope of the claims of invention.
Claims (4)
1. a kind of down-hole coal bed region gas pumping effect analysis method based on monitoring historical data, it is characterised in that: including
If a. according to adjacent position and connecing the mash gas pumping drilling in coal seam to find time and being divided into dry hole control area,
B. the extraction borehole in same control area is accessed into same drilling collector-shoe gear, the drilling collector-shoe gear and gas are taken out
Pipeline connection is adopted,
C. it acquires the gas drainage supplemental characteristic of the pipeline between drilling collector-shoe gear and gas pumping pipeline and records,
D. according to the gas drainage supplemental characteristic of acquisition, gas drainage unit cumulant is obtained, and gas pumping effect is carried out
Evaluation and prediction；
Gas drainage parameter includes gas extraction flow, gas density, gas pressure and record time, interval measurement control area
Interior gas drainage parameter passes through the gas drainage unit cumulant in following formula obtaining step d:
Wherein, qiFor gas extraction flow, Δ t is interval time, QiFor gas drainage unit cumulant；
The following gas pumping effect sometime is predicted by following formula:
Wherein, QTFor the gas drainage cumulant of the following sometime T, c0For the initial mash gas extraction concentration that drills, ctFor t moment
Hole pumping and mining gas density, q0For the initial gas drainage amount that drills, b is regression coefficient, P0For the initial gas pressure in coal seam, Pt t
The coal-bed gas pressure at moment, β are mash gas extraction flux depression coefficient, and t is the extraction moment.
2. the down-hole coal bed gas pumping effect analysis method in region according to claim 1 based on monitoring historical data,
It is characterized by: the gas drainage unit cumulant in different time stage is continuously acquired, according to watt after the n Δ t time of experience
This extraction unit cumulant is evaluated and is predicted to the coal bed gas extraction effect in the control area.
3. the down-hole coal bed gas pumping effect analysis method in region according to claim 1 based on monitoring historical data,
It is characterized by: passing through the gas remainder quantity W of control area gas pre-drainage rate γ and control area coalcy, in control area
Coal bed gas extraction effect evaluated；
The control area gas pre-drainage rate γ is obtained by following formula:
Wherein, QzFor the gas gross reserves in the control area, Qn is to accumulate by the gas drainage unit of n time interval Δ t
Amount；
The gas remainder quantity W of the control area coalcyIt is obtained by following formula:
Wherein, L is control area bearing length, and l is coal seam average propensity length in control area, and m is flat for control area
Equal coal seam thickness, ρ are the density of control area coal.
4. the down-hole coal bed gas pumping effect analysis method in region according to claim 3 based on monitoring historical data,
It is characterized by: will be monitored with the extension of extraction time in the decaying of negative exponential function form according to drilling gas extraction flow
The historical data of gas drainage parameter carry out numerical fitting, obtain mash gas extraction flux depression coefficient and regression coefficient.
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| CN107967559B (en) * | 2017-11-21 | 2021-09-21 | 辽宁工程技术大学 | Gas extraction standard-reaching evaluation visual management system and method |
| CN110307035B (en) * | 2019-06-28 | 2021-02-12 | 贵州大学 | Device and method for testing coal bed gas basic parameters and predicting gas accumulation zone |
| CN110598244B (en) * | 2019-07-26 | 2021-03-12 | 中国矿业大学 | Gas cluster life cycle prediction and gas concentration prediction method based on same |
| CN112836350B (en) * | 2021-01-11 | 2024-03-08 | 中国矿业大学 | Real-time calculation method for gas extraction parameters of underground coal mine pipe network |
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