CN105787805A - Coal-bed gas well multi-coal seam combined drainage and mining technique evaluation method - Google Patents
Coal-bed gas well multi-coal seam combined drainage and mining technique evaluation method Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 48
- 238000005065 mining Methods 0.000 title claims abstract description 45
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- 238000012360 testing method Methods 0.000 claims description 13
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 238000005553 drilling Methods 0.000 claims description 5
- 230000035699 permeability Effects 0.000 claims description 5
- 238000011160 research Methods 0.000 claims description 4
- 238000003795 desorption Methods 0.000 claims description 3
- 238000003475 lamination Methods 0.000 claims description 3
- 230000006978 adaptation Effects 0.000 abstract 1
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- 238000011161 development Methods 0.000 description 7
- 239000002356 single layer Substances 0.000 description 3
- 241001347978 Major minor Species 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
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Abstract
The invention discloses a coal-bed gas well multi-coal seam combined drainage and mining technique evaluation method and belongs to the technical field of coal-bed gas exploitation. According to coal-bed gas geological exploration data and historical data, the method carries out comparison and analysis on reservoir parameters among a plurality of coal seams in a multi-coal seam region and combined-layer drainage and mining adaptation evaluation. Under an evaluation system above, the method comprises reservoir parameter single factor analysis, parameter weight assignment and final multi-parameter comprehensive assessment, and finally, realizes the purpose of judging whether target coal seams are suitable for combined-layer drainage and mining.
Description
Technical field
The present invention relates to the evaluation methodology of a kind of coal bed gas well multiple seam associating mining technology, belong to CBM exploration and development technical field.
Background technology
At present, China's cbm development is many based on monolayer pressure break monolayer mining.In China, under the geological conditions of low-permeability, low saturation and low reservoir pressure, the shaft building cost of investment of monolayer mining is huge, corresponding economy is produced effects and but might not be reached expection, and therefore increasing output increased economic recovery rate to greatest extent is that cbm development becomes the basis forming industrial sector from scientific research.The exploration and development technology of coal bed gas is proposed requirements at the higher level by this.
Closing layer mining is utilize same pit shaft that two and above coal seam are carried out cbm development simultaneously.But close two coal seam superpositions that layer mining is not simple to develop, the restriction of interlayer interference factor makes conjunction layer mining technology must be based on certain geological foundation, analyzes from parametric synthesis such as permeability, Gas content, reservoir pressure and porositys and considers whether two coal seams are suitable for carrying out closing layer mining.
Summary of the invention
In order to overcome the problem that existing multiple seam area cbm development production capacity is not enough, the present invention provides a kind of and judges that coal seam reservoirs is if appropriate for the evaluation methodology closing layer mining.
It is an object of the invention to provide the evaluation methodology of a kind of coal bed gas well multiple seam associating mining technology, solve coal bed gas after investigation and prospecting carries out, be evaluated target coal seam reservoir parameter analyzing, it is judged that whether target coal seam carries out closing layer mining.
This invention address that the technical scheme of problem: the evaluation methodology of a kind of coal bed gas well multiple seam associating mining technology, according to early stage drilling well, well logging, well testing and fracturing technique analysis, pass sequentially through single factor test, the judgement of multifactor weight analysis and Comprehensive Assessment and judge to close layer mining feasibility.
Further, the method contains following steps:
Step 1: according to the drilling well of target area target coal seam, well testing, well logging and pressure break analysis, it is determined that the Main Reservoirs parameter of layer mining is closed in impact, and each reservoir parameter carries out the influence degree of single factor analysis conjunction layer mining.
Step 2: the influence degree of production capacity is compared according to each reservoir parameter, composes weight to it.
Step 3: adopting matching degree parameter by arranging conjunction, comprehensive each parameter is analyzed between multiple seam whether be suitable for closing a layer mining.
Further, as preferably, for closing layer mining, its crucial reservoir parameter includes Gas content, permeability, porosity and desorption pressures.
Further, as preferably, introducing parameter perturbation degree concept；
Wherein:Parameter perturbation degree；
The single reservoir parameter value in a, b major-minor coal seam；
Absolute value changes between 0-1, when absolute value is more little, is about conducive to carrying out closing layer mining；For reservoir pressure single factor test, it is necessary to notice that necessary underlying seam reservoir pressure is more than superjacent, otherwise will cause that top reservoir water pours in down a chimney into underlying seam.
For single factor test, parameter perturbation degree can press value classification:
After single factor test Parameter analysis, it is necessary to carrying out each reservoir parameter composing weight, each weight factor changes between 0-1.
Further, as preferably, after composing weighted value, it is necessary to commingled producing well entirety is analyzed by comprehensive each parameter, now it is introduced back into concept conjunction and adopts matching degree:
；
Wherein:Matching degree is adopted in conjunction；
The parameter perturbation degree of the n-th factor；
The weight of the n-th factor；
For coupling degree of disturbance, can according to lower value classification:
Adopt matching degree according to conjunction and carry out grade classification, it is possible to feasibility is adopted in the conjunction comparing multiple seam area target block intuitively.
Further, as preferably, when the conjunction mining coal seam needing research is three and coal seam above, it is necessary first to respectively the conjunction layer workability in adjacent two coal seams is studied.If it is suitable that each adjacent lamination is adopted, then again comparing each reservoir on this basis, for the parameter that weight is bigger, two coal seams selecting its difference relatively large again carry out conjunction and adopt feasibility analysis simultaneously.
Detailed description of the invention
The evaluation methodology of a kind of coal bed gas well multiple seam associating mining technology, according to early stage drilling well, well logging, well testing and fracturing technique analysis, passes sequentially through single factor test, the judgement of multifactor weight analysis and Comprehensive Assessment and judges to close layer mining feasibility.
Further, the method contains following steps:
Step 1: according to the drilling well of target area target coal seam, well testing, well logging and pressure break analysis, it is determined that the Main Reservoirs parameter of layer mining is closed in impact, and each reservoir parameter carries out the influence degree of single factor analysis conjunction layer mining.
Step 2: the influence degree of production capacity is compared according to each reservoir parameter, composes weight to it.
Step 3: adopting matching degree parameter by arranging conjunction, comprehensive each parameter is analyzed between multiple seam whether be suitable for closing a layer mining.
For closing layer mining, first have to distinguish main mining coal seam and secondary coal seam.On this basis each parameter in each coal seam is carried out single factor analysis, on this basis in further weighted, explore the conjunction layer mining ability of whole coal bed gas well after each parameter combines.
For closing layer mining, its crucial reservoir parameter includes Gas content, permeability, porosity, desorption pressures etc..
Introduce parameter perturbation degree concept
Wherein:Parameter perturbation degree
The single reservoir parameter value in a, b major-minor coal seam
Absolute value changes between 0-1, whenAbsolute value is more little, is about conducive to carrying out closing layer mining.For reservoir pressure single factor test, it is necessary to notice that necessary underlying seam reservoir pressure is more than superjacent, otherwise will cause that top reservoir water pours in down a chimney into underlying seam.
For single factor test, parameter perturbation degree can press value classification:
Table 1 degree of disturbance classification chart
| Numerical range | ≥0.9 | 0.9~0.6 | 0.4~0.6 | 0.1~0.4 | ≤0.1 |
| Rank | Difference | Poor | Medium | Better | Good |
After single factor test Parameter analysis, it is necessary to carry out each reservoir parameter composing weight.Owing to the fast geological condition in each cbm development district is not quite similar, therefore this step is required for evaluation region concrete condition and is analyzed, it is however generally that most critical parameters is reservoir pressure and permeability factor, can give heavier ratio.Each weight factor changes between 0-1.
After composing weighted value, it is necessary to commingled producing well entirety is analyzed by comprehensive each parameter, now it is introduced back into concept conjunction and adopts matching degree
Wherein:Matching degree is adopted in conjunction
The parameter perturbation degree of the n-th factor
The weight of the n-th factor
For coupling degree of disturbance, can according to lower value classification:
Table is 2-in-1 adopts matching degree classification chart
| Numerical range | ≤0.5 | 0.5~0.7 | 0.7~0.9 | ≥0.9 |
| Rank | Disturb bigger | General interference | Lower interference | Noiseless |
Adopting matching degree according to conjunction and carry out grade classification, we can compare the conjunction of multiple seam area target block intuitively and adopt feasibility.This evaluation methodology is authentic and valid for quickly judging that feasibility is adopted in conjunction, but for particular block be evaluated simultaneously for needing evaluating and weight thereof to select flexibly and assignment, to ensure that the method can mate target block.
When the conjunction mining coal seam needing research is three and coal seam above, it is necessary first to respectively the conjunction layer workability in adjacent two coal seams is studied.If it is suitable that each adjacent lamination is adopted, then again comparing each reservoir on this basis, for the parameter that weight is bigger, two coal seams selecting its difference relatively large again carry out conjunction and adopt feasibility analysis, if all can achieve the goal needs simultaneously.
The evaluation methodology of this coal bed gas commingling production is adopted comparatively speaking just for singly adopting with conjunction, the judgement of its production efficiency and recovery ratio angle, can not instructing the parameters such as average daily gas production aquifer yield under given row degree of gathering and processing, this also needs to later stage further productivity simulation.
Claims (6)
1. the evaluation methodology of coal bed gas well multiple seam associating mining technology, it is characterised in that carry out single factor analysis according to the reservoir parameter of evaluating production capacity and multi-factor classification weight analysis carries out the conjunction layer in two coal seams and multiple coal seam and can adopt feasibility study.
2. the evaluation methodology of a kind of coal bed gas well multiple seam according to claim 1 associating mining technology, it is characterised in that containing following steps:
Step 1: according to the drilling well of target area target coal seam, well testing, well logging and pressure break analysis, it is determined that the Main Reservoirs parameter of layer mining is closed in impact, and each reservoir parameter carries out the influence degree of single factor analysis conjunction layer mining；
Step 2: the influence degree of production capacity is compared according to each reservoir parameter, composes weight to it；
Step 3: adopting matching degree parameter by arranging conjunction, comprehensive each parameter is analyzed between multiple seam whether be suitable for closing a layer mining.
3. the evaluation methodology of a kind of coal bed gas well multiple seam according to claim 2 associating mining technology, it is characterised in that for closing layer mining, its crucial reservoir parameter includes Gas content, permeability, porosity and desorption pressures.
4. the evaluation methodology of a kind of coal bed gas well multiple seam according to claim 2 associating mining technology, it is characterised in that introduce parameter perturbation degree concept
5. the evaluation methodology of a kind of coal bed gas well multiple seam according to claim 4 associating mining technology, it is characterised in that after composing weighted value, it is necessary to commingled producing well entirety is analyzed by comprehensive each parameter, is now introduced back into concept conjunction and adopts matching degree:
6. the evaluation methodology of a kind of coal bed gas well multiple seam according to claim 4 associating mining technology, it is characterized in that, when the conjunction mining coal seam needing research is three and coal seam above, it is necessary first to respectively the conjunction layer workability in adjacent two coal seams is studied；If it is suitable that each adjacent lamination is adopted, then again comparing each reservoir on this basis, for the parameter that weight is bigger, two coal seams selecting its difference relatively large again carry out conjunction and adopt feasibility analysis simultaneously.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108197421A (en) * | 2017-12-27 | 2018-06-22 | 中海石油(中国)有限公司 | A kind of tight gas and coal bed gas develop jointly Favorable Areas method for quantitatively evaluating |
| CN108335225A (en) * | 2018-01-30 | 2018-07-27 | 中国矿业大学 | One kind being directed to multiple seam high-ground stress area coal bed gas geological selection area analysis method |
| CN111396020A (en) * | 2020-02-24 | 2020-07-10 | 中石油煤层气有限责任公司 | Evaluation method for interference between coal-bed gas wells |
-
2016
- 2016-03-18 CN CN201610154842.1A patent/CN105787805A/en active Pending
Non-Patent Citations (3)
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| 倪小明等: ""樊庄地区3#和15#煤层合层排采的可行性研究"", 《天然气地球科学》 * |
| 罗开艳等: ""松河井田煤层群条件下合层排采煤层气可行性研究"", 《煤炭科学技术》 * |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108197421A (en) * | 2017-12-27 | 2018-06-22 | 中海石油(中国)有限公司 | A kind of tight gas and coal bed gas develop jointly Favorable Areas method for quantitatively evaluating |
| CN108197421B (en) * | 2017-12-27 | 2021-09-21 | 中海石油(中国)有限公司 | Quantitative evaluation method for beneficial zone of joint development of dense gas and coal bed gas |
| CN108335225A (en) * | 2018-01-30 | 2018-07-27 | 中国矿业大学 | One kind being directed to multiple seam high-ground stress area coal bed gas geological selection area analysis method |
| WO2019148704A1 (en) * | 2018-01-30 | 2019-08-08 | 中国矿业大学 | Coal bed gas geological selection area analysis method aiming at multiple-coal-bed high ground stress region |
| US11008859B2 (en) | 2018-01-30 | 2021-05-18 | China University Of Mining And Technology | Method for analyzing coalbed methane geological selection of multi-coalbed high ground stress region |
| CN108335225B (en) * | 2018-01-30 | 2021-10-29 | 中国矿业大学 | Geological area analysis method for coal bed gas in multi-coal-bed high-geostress area |
| CN111396020A (en) * | 2020-02-24 | 2020-07-10 | 中石油煤层气有限责任公司 | Evaluation method for interference between coal-bed gas wells |
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