CN104763406A - Method for measuring extraction influence radius based on bedding drilling gas emission characteristics - Google Patents
Method for measuring extraction influence radius based on bedding drilling gas emission characteristics Download PDFInfo
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- CN104763406A CN104763406A CN201510045817.5A CN201510045817A CN104763406A CN 104763406 A CN104763406 A CN 104763406A CN 201510045817 A CN201510045817 A CN 201510045817A CN 104763406 A CN104763406 A CN 104763406A
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- gas
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
Abstract
A method for measuring an extraction influence radius based on bedding drilling gas emission characteristics comprises the following steps: 1) drilling observation holes; 2) measuring an initial gas emission amount of each observation hole, then constructing extraction holes, extracting by a networking manner after sealing all the observation holes and the extraction holes; 3) measuring a gas emission amount of each observation hole, then drawing a gas emission amount change curve; 4) applying a regression analysis to the gas emission amount change curve of each observation hole; 5) basing on the regression analysis result and a gas emission amount overall change curve; 6) figuring out a gas emission amount attenuation factor for the later period; and 7) determining a gas extraction influence radius. On one aspect, the method for measuring the extraction influence radius based on the bedding drilling gas emission characteristics overcomes the defects that the gas pressure value is difficult to measure, and an error between the real value and the measured value exists; on another aspect, the method for measuring the extraction influence radius based on the bedding drilling gas emission characteristics overcomes the defects that the gas tracing method is greatly influenced by manual operations, is low in reliability and is high in cost. Meanwhile, the problem that the model constructed by computer simulation method is too ideal is reduced. The method for measuring the extraction influence radius based on the bedding drilling gas emission characteristics is simple in operation, accurate in measurement, and substantially short in time consumption.
Description
Technical field
The invention belongs to the technical field of mine safety of gas pumping and control coal and gas prominent aspect, be specifically related to a kind of method of the characteristic measurement extraction radius of influence of gushing out based on concordant drilling gas.
Background technology
In the last few years, the method measuring the extraction radius of influence mainly contains: gas pressure index method, gas flow method, content's index method, tracer gas technique, computer simulation method etc.Pressure decline method is in coal seam, first make a call to row's pressure tap, loads onto pressure meter, tight-closed, then in its side construction drainage holes networking extraction; The pressure of periodic observation pressure tap, if the pressure of a certain pressure tap is less than Gas pre-drainage validity pressure index P
0, then this boring is the extraction radius of influence apart from the distance of drainage holes.It is noted that said determination method equipment needed thereby and personnel more, each pressure tap needs Continuous Observation, and the testing time is long, and measures coal-bed gas pressure and require higher to sealing quality, and the quality of sealing quality is the key ensureing measurement result.
At present, the gas pressure measurement of concordant boring remains the difficult problem that industry not yet effectively solves.In addition, by coal seam geological condition and the impact of exploiting disturbance, be difficult to measure coal-bed gas pressure continuously, exactly.Namely relative pressure index method is based on such consideration, and measure the amplitude that gas pressure declines, therefore comparing pressure decline method will have certain superiority.Measuring principle and the pressure decline method of content's index method are similar, all will measure coal-bed gas pressure, just separately get again coal sample and measure relevant parameter, as coal body solid coefficient, coal-bed gas absorption constant etc., indirectly try to achieve coal seam gas-bearing capacity.Compare pressure decline method, just the Validity Index investigating extraction radius is transformed to gas bearing capacity by gas pressure; Owing to measuring coal-bed gas pressure equally, and pressure decline method has the identical shortcoming being difficult to overcome.Tracer gas technique is at injecting hole both sides different distance construction drainage holes, detects the time of search gas and the relation determination extraction radius of distance by investigating.Although search gas is generally inert gas, detection sensitivity is high, injects another gas will certainly change coal seam reset pressure gradient to coal seam, and does not consider the difference of transport characteristics in coal seam of search gas and gas.Computer simulation method sets up drilling gas flow model based on GAS Flow Theory in Coal Seam, conditions setting, according to the solver simulation boring Gas Flow state around of establishment, but assumed condition is too idealized, can not simulated field actual conditions completely.
Summary of the invention
The present invention, in order to solve weak point of the prior art, provides a kind of simple to operate, method of measuring the shorter characteristic measurement extraction radius of influence of gushing out based on concordant drilling gas accurate, consuming time.
For solving the problems of the technologies described above, the present invention adopts following technical scheme: the method for the characteristic measurement extraction radius of influence of gushing out based on concordant drilling gas, comprises the following steps:
1) the some observation boring of the construction that keeps at a certain distance away at the fresh sudden and violent leakage rib place in tunnel, each observation drill center line is parallel to each other;
2) measure the initial outburst amount of gas of each observation boring, drainage holes of then constructing, by extraction of networking after all peepholes and drainage holes sealing of hole;
3) measure the gas emission of each peephole, then draw gas emission change curve;
4) regression analysis is carried out to the gas emission change curve of each peephole;
5) according to Regression Analysis Result and gas emission overall variation curve, analyze the segmenting feature of peephole gas emission, determine early stage and the later stage of gas emission decay characteristics, change curve carries out segment processing;
6) the gas emission change curve in regression analysis later stage, obtains the gas emission attenuation factor in later stage;
7) according to the catastrophe that later stage gas emission attenuation factor affects by extraction negative pressure, and in conjunction with hundred meters of drilling gas limit discharge values, the gas pumping radius of influence is determined.
In extraction circle of influence, part Gas-Flow is to drainage holes, and gas emission decay is very fast, and attenuation factor is larger; Beyond extraction circle of influence scope, gas emission presses exponential rule decay, and attenuation factor is less; The peephole gas emission attenuation factor affected by extraction in extraction circle of influence is obviously greater than at extraction circle of influence outward not by the peephole attenuation factor that extraction affects.
The whole process that drilling gas is gushed out is divided into early stage and later stage, the data spread of each observation on graph paper, obviously observes the turning point of a slope, and the front 5 ~ 7d being generally observation time is divided into early stage, is divided into the later stage after 5 ~ 7d; Because early stage, later stage attenuation factor difference are comparatively large, piecewise fitting correlation is apparently higher than overall fit correlation; Later stage because of the extraction time is longer than early stage, therefore mainly compares later stage attenuation factor when investigating each drilling gas outburst amount attenuation factor.
Adopt technique scheme, the present invention is using drilling gas outburst amount as inspection target, by making a call to row's nature bleeder off hole in extraction borehole both sides different distance, drilling gas outburst amount is measured with multilevel flow gauge, to gush out according to drilling gas the segmenting feature of catastrophe that attenuation factor affects by extraction negative pressure and Gas, and in conjunction with hundred meters of drilling gas limit discharge value determination gas pumping radiuses of influence.Compare other extraction radius of influence assay methods, instant invention overcomes gas pressure pH-value determination pH difficulty comparatively large, there is certain error in actual value and measured value; Tracer gas technique manual operation impact is comparatively large, and reliability is lower and cost is higher; The shortcomings such as too idealized set up by computer simulation method model, and simple to operate, measure accurately, consuming time shorter.
Accompanying drawing explanation
Fig. 1 is flow chart of the present invention;
Fig. 2 is that in the present invention, in tunnel, peephole and drainage holes arrange schematic diagram;
Fig. 3 is each peephole gas flow in early stage change and negative exponential function in the present invention, and namely early stage, drilling gas outburst amount changed matched curve in time;
Fig. 4 is the gas flow change of each peephole later stage and negative exponential function in the present invention, and namely drilling gas outburst amount changes matched curve in time the later stage.
Detailed description of the invention
As shown in Figure 1, the method for the characteristic measurement extraction radius of influence of gushing out based on concordant drilling gas of the present invention, comprises the following steps:
1) the some observation boring of the construction that keeps at a certain distance away at the fresh sudden and violent leakage rib place in tunnel, each observation drill center line is parallel to each other;
2) measure the initial outburst amount of gas of each observation boring, drainage holes of then constructing, by extraction of networking after all peepholes and drainage holes sealing of hole;
3) measure the gas emission of each peephole, then draw gas emission change curve;
4) regression analysis is carried out to the gas emission change curve of each peephole;
5) according to Regression Analysis Result and gas emission overall variation curve, analyze the segmenting feature of peephole gas emission, determine early stage and the later stage of gas emission decay characteristics, change curve carries out segment processing;
6) the gas emission change curve in regression analysis later stage, obtains the gas emission attenuation factor in later stage;
7) according to the catastrophe that later stage gas emission attenuation factor affects by extraction negative pressure, and in conjunction with hundred meters of drilling gas limit discharge values, the gas pumping radius of influence is determined.
In extraction circle of influence, part Gas-Flow is to drainage holes, and gas emission decay is very fast, and attenuation factor is larger; Beyond extraction circle of influence scope, gas emission presses exponential rule decay, and attenuation factor is less; The peephole gas emission attenuation factor affected by extraction in extraction circle of influence is obviously greater than at extraction circle of influence outward not by the peephole attenuation factor that extraction affects.
The whole process that drilling gas is gushed out is divided into early stage and later stage, the data spread of each observation on graph paper, obviously observes the turning point of a slope, and the front 5 ~ 7d being generally observation time is divided into early stage, is divided into the later stage after 5 ~ 7d; Because early stage, later stage attenuation factor difference are comparatively large, piecewise fitting correlation is apparently higher than overall fit correlation; Later stage because of the extraction time is longer than early stage, therefore mainly compares later stage attenuation factor when investigating each drilling gas outburst amount attenuation factor.
Be described for certain ore deposit actual measurement gas pumping radius of influence below:
For ease of comparative analysis, seven peepholes 1 of constructing altogether.Peephole is numbered 1
#, 2
#, 3
#, 4
#, 5
#, 6
#, 7
#hole, seven peepholes 1 are in the distribution of the both sides of drainage holes 2, and concrete layout as shown in Figure 2.First construction peephole 1, perpendicular to 3 times, tunnel side, perforate height 1.0m, aperture 113mm, hole depth 30m, 5 °, inclination angle, PVC hole sealing tube sealing of hole also measures drilling gas flow.Construction drainage holes 2 thereupon, perforate height 1.0m, aperture 113mm, hole depth 30m, 5 °, inclination angle, adopts polyurethane sealing of hole, hole sealing depth 9m, extraction negative pressure 13kPa.After starting extraction, the gas nature outburst amount in-periodic observation 1 to No. 7 hole.At the initial stage, the drilling gas outburst amount rate of decay is fast, needs observe every day.Afterwards, along with extraction time lengthening, the drilling gas outburst amount rate of decay is slack-off, and observing interval can extend gradually, and the later stage can be observed weekly once.
To nearly two months survey data and carry out exponential rule regression analysis, draw early stage, later stage drilling gas flux depression curve respectively as shown in Figure 3 and Figure 4.1
#namely hole gas flow in 5 days of test decays to zero, figure does not do show.In figure, equation is each peephole regression curve equation, meets exponential rule.
according to gas emission regression equation in figure, integration is carried out to it, can obtain in cumulative time t internal drilling Gas total amount:, when
time, boring limit firedamp drainage amount.For No. 4 holes, in 5.2 days early stages of holing, gas flux depression is very fast, and with this time point for boundary, two stages of calculating add up firedamp drainage amount respectively; Coal hole length 20m(hole depth 30m, deducting pre-gas-removing equivalent breadth is 10m), drilling gas nature outburst amount is:
Then hundred meters of drilling gas limit discharge values are as follows:
In like manner can calculate hundred meters of drilling gas limit discharge values of other boring as following table:
The each peephole of table 1 hundred meters of drilling gas limit discharge values
Interpretation of result
(1) analyze known to observation data, 1
#peephole gas flow affects by drainage holes, and sharply decay to zero in extraction in 5 days, attenuation factor is larger; 2
#, 3
#peephole attenuation factor reduces successively, drops to 0.1L/min in 18 days, 42 days respectively in test; 4
#, 5
#, 6
#, 7
#peephole attenuation factor is less, drops to 1.1L/min greatly in 50 days.
(2) drilling gas flux depression coefficient is investigated: 2
#, 3
#peephole later stage gas flow attenuation factor is respectively 0.0655,0.0667, and 4
#, 5
#, 6
#, 7
#peephole later stage gas flow attenuation factor is respectively 0.0202,0.0182,0.0219,0.0217, is 2
#with 3
#/ 3rd of a peephole, illustrates 2
#, 3
#peephole is in the extraction radius of influence, and boring part gas is around pumped under the effect of extraction negative pressure, and sudden change has appearred in gas flow.It can thus be appreciated that the extraction radius of influence should be equal to or greater than 3
#peephole controllable distance and be less than 4
#peephole controllable distance, namely the extraction radius of influence is between 2m ~ 2.5m.
(3) again as shown in Table 1,2
#, 3
#peephole hundred meters of drilling gas limit discharge values are significantly less than 4
#, 5
#, 6
#, 7
#peephole, show that these two peepholes are in extraction borehole control range, the gas amount of desorb and walkthrough is discharged through drainage holes, is not observed.Can see, 3 simultaneously
#peephole limit firedamp drainage amount is 2
#2.61 times of peephole, 4
#, 5
#, 6
#, 7
#peephole is in same level, is 3
#4.97 times of peephole, illustrate 3
#peephole has been in extraction circle of influence edge, and show that face is adopted through extraction in two months in this ore deposit, the hole pumping and mining radius of influence is 2m.After this along with the prolongation of time, the hole pumping and mining radius of influence affects less by extraction negative pressure.
Above embodiment is the unrestricted technical scheme of the present invention in order to explanation only, although with reference to above-described embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that: still can modify to the present invention or equivalent replacement, and not departing from any modification or partial replacement of the spirit and scope of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (3)
1. to gush out based on concordant drilling gas the method for the characteristic measurement extraction radius of influence, it is characterized in that: comprise the following steps,
1) the some observation boring of the construction that keeps at a certain distance away at the fresh sudden and violent leakage rib place in tunnel, each observation drill center line is parallel to each other;
2) measure the initial outburst amount of gas of each observation boring, drainage holes of then constructing, by extraction of networking after all peepholes and drainage holes sealing of hole;
3) measure the gas emission of each peephole, then draw gas emission change curve;
4) regression analysis is carried out to the gas emission change curve of each peephole;
5) according to Regression Analysis Result and gas emission overall variation curve, analyze the segmenting feature of peephole gas emission, determine early stage and the later stage of gas emission decay characteristics, change curve carries out segment processing;
6) the gas emission change curve in regression analysis later stage, obtains the gas emission attenuation factor in later stage;
7) according to the catastrophe that later stage gas emission attenuation factor affects by extraction negative pressure, and in conjunction with hundred meters of drilling gas limit discharge values, the gas pumping radius of influence is determined.
2. the method for the characteristic measurement extraction radius of influence of gushing out based on concordant drilling gas according to claim 1, is characterized in that: in extraction circle of influence, and part Gas-Flow is to drainage holes, and gas emission decay is very fast, and attenuation factor is larger; Beyond extraction circle of influence scope, gas emission presses exponential rule decay, and attenuation factor is less; The peephole gas emission attenuation factor affected by extraction in extraction circle of influence is obviously greater than at extraction circle of influence outward not by the peephole attenuation factor that extraction affects.
3. the method for the characteristic measurement extraction radius of influence of gushing out based on concordant drilling gas according to claim 1 and 2, it is characterized in that: the whole process that drilling gas is gushed out is divided into early stage and later stage, the data spread of each observation on graph paper, obviously observe the turning point of a slope, front 5 ~ the 7d being generally observation time is divided into early stage, is divided into the later stage after 5 ~ 7d; Because early stage, later stage attenuation factor difference are comparatively large, piecewise fitting correlation is apparently higher than overall fit correlation; Later stage because of the extraction time is longer than early stage, therefore mainly compares later stage attenuation factor when investigating each drilling gas outburst amount attenuation factor.
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Cited By (4)
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| CN105041370A (en) * | 2015-08-24 | 2015-11-11 | 安徽理工大学 | Two-dimensional flow field testing method applied to coal seam gas extraction by drilling boreholes down seam |
| CN106503357A (en) * | 2016-11-02 | 2017-03-15 | 河南理工大学 | Method based on the effective extraction radius of layer-through drilling Gas characteristic measurement |
| CN106644562A (en) * | 2016-09-14 | 2017-05-10 | 中国矿业大学(北京) | Simple and convenient method for detecting original content of gas |
| CN109490510A (en) * | 2018-11-01 | 2019-03-19 | 河南理工大学 | Method based on the layer-through drilling Gas characteristic measurement hydraulic flushing in hole radius of influence |
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Cited By (6)
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|---|---|---|---|---|
| CN105041370A (en) * | 2015-08-24 | 2015-11-11 | 安徽理工大学 | Two-dimensional flow field testing method applied to coal seam gas extraction by drilling boreholes down seam |
| CN106644562A (en) * | 2016-09-14 | 2017-05-10 | 中国矿业大学(北京) | Simple and convenient method for detecting original content of gas |
| CN106503357A (en) * | 2016-11-02 | 2017-03-15 | 河南理工大学 | Method based on the effective extraction radius of layer-through drilling Gas characteristic measurement |
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| CN109490510A (en) * | 2018-11-01 | 2019-03-19 | 河南理工大学 | Method based on the layer-through drilling Gas characteristic measurement hydraulic flushing in hole radius of influence |
| CN109490510B (en) * | 2018-11-01 | 2021-09-17 | 河南理工大学 | Method for measuring hydraulic punching influence radius based on cross-layer drilling gas emission characteristics |
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