CN204238921U - A kind of compound Coaliferous Gas Pool commingling production structure - Google Patents
A kind of compound Coaliferous Gas Pool commingling production structure Download PDFInfo
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- CN204238921U CN204238921U CN201420573312.7U CN201420573312U CN204238921U CN 204238921 U CN204238921 U CN 204238921U CN 201420573312 U CN201420573312 U CN 201420573312U CN 204238921 U CN204238921 U CN 204238921U
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Abstract
The utility model discloses a kind of compound Coaliferous Gas Pool commingling production structure, comprise straight well or inclined shaft, medium-thickness seam in straight well or inclined shaft or 2-5 girdle place perforation form perforation layer, 1-4 perforation layer forms fracturing section, the utility model adopts the many laminate structures of this compound Coaliferous Gas Pool, can enlarge markedly daily output tolerance and the gas deliverability of coal bed gas well, improves coal bed gas resource recovery ratio, save cbm development engineering funds to drop into, obtain better economy, environmental benefit.
Description
Technical field
The utility model relates to a kind of compound Coaliferous Gas Pool commingling production structure, belongs to and builds development technique field, coal seam.
Background technology
China's coal bed gas resource enriches, and prediction buried depth 2000m reaches 36.8 × 10 with shallow coal bed gas geological resources
12m
3suitable with conventional gas stock number, the exploitation of coal bed gas scale resource can alleviate China's conventional gas and oil energy shortage situation, reduces coal mine gas explosion occurrence probability, reduce coal production greenhouse Gas Emission amount, produce significant economy, environment, safety and social benefit.
The coal basin of China's tool coal bed gas resource potentiality to be exploited generally grows coal seam group, what cause coal bed gas resource relative distribution is distributed in multiple coal seam and interlayer sandstone, in siltstone reservoir, form compound Coaliferous Gas Pool, adopt single coal seam perforation, pressure break mode carries out coal bed gas Ground Developing, not only engineering funds has high input, and be difficult to obtain higher well yield, gas recovery ratio is low, the deficiency in economic performance of coal bed gas Ground Developing, in order to push forward China's coal bed gas Ground Developing work comprehensively, just need to solve the multiple seam coal bed gas conjunction of coal seam group development area to adopt, between coal bed gas and coal seam, sandstone gas closes and adopts this two large key technical problem.
Utility model content
The purpose of this utility model is: provide a kind of compound Coaliferous Gas Pool commingling production structure effectively to overcome the deficiency of coal bed gas Ground Developing technology under existing coal seam group developmental condition.
The technical solution of the utility model
A kind of compound Coaliferous Gas Pool commingling production method, adopts the series of processes of substratum perforation, staged fracturing, associating mining to carry out coal-formed gas Ground Developing;
Concrete steps are: pass through coal seam group from the straight well of ground construction " two opening structures " or deviated directional drilling high angle, hole termination depth is 40-50m apart from underseam distance, two open intermediate casing cementing, according to core log, gas detection logging, the result of geophysical log and sampling and testing selects thickness large, air content and gas saturation high, permeability is high and the coal seam of the tool property transformed and roof and floor thereof Sandstone Gas Bearing layer carries out substratum perforation, carry out fracturing section according to the vertical distance of perforation layer and divide fracturing section, fracturing is carried out from bottom to top again by back-up sand mode, pressure break terminates rear spy sand face and sand washing, to coal seam in all fracturing sections and Sandstone Gas Bearing layer associating mining.
In aforesaid compound Coaliferous Gas Pool commingling production method; develop and the Resource predication amount ensureing tool scale potentiality to be exploited in single perforation layer to take into account Seam Roof And Floor coal-formed gas; when perforation layer position is preferred; high seam should be avoided; prevent this layer from telling coal dust in a large number and affecting normal mining work; medium-thickness seam and gassiness roof and floor thereof can be used as a perforation layer; 2-5 girdle and folded Sandstone Gas Bearing layer thereof can be used as an alternative perforation layer, and single sandstone gas-bearing bed not can be used as a perforation layer.
In aforesaid compound Coaliferous Gas Pool commingling production method, in order to ensure that the major fracture length that pressure break is formed is greater than 200mm, the fracturing section quantity of individual well controls at 3-8, and adjacent fracturing section spacing is not less than 35m, and single fracturing section thickness is less than 16m.
In aforesaid compound Coaliferous Gas Pool commingling production method, for ensureing carrying out smoothly and reaching desirable reservoir reconstruction effect of staged fracturing construction, single fracturing section comprises 1-4 perforation layer, and injection aperture layer thickness is 2-8m.
In aforesaid compound Coaliferous Gas Pool commingling production method, adopt 102 type perforating guns, 127 type perforating bullet, 60 ° of phase place spiral perforations, hole density is 10-25 bullet/m.
In aforesaid compound Coaliferous Gas Pool commingling production method, after fracturing section divides, adopt and carry out fracturing from bottom to top, for ensureing pressing crack construction safety, in fracturing process, maximum pressure should lower than 38MPa, and discharge capacity is 6.0-11.0m
3/ min.
In aforesaid compound Coaliferous Gas Pool commingling production method, employing adds sand mode step by step and carries out fracture support, and average sand is than being 10-11%.In fracturing process, adopt stuff shutoff to form the layer position in crack, improve operation pressure further, to obtain better fracturing effect; The pressure break later stage adopts low discharge capacity, high sand ratio mode carries out back-up sand, to shorten the pressing crack construction cycle.
Compound Coaliferous Gas Pool commingling production mining overall process comprises draining overflow, liquid level falls in draining, build the pressure, nearly gas well gas pilot production, pressure control stable yields, production declines six stages (this six stage is all prior art), concrete mining scheme is formulated according to each exploitation interval reservoir pressure, air content, gas saturation and isothermal adsorption characteristics, and according to water, gas output and casing pressure, stream pressure, fluid column change adjustment in mining process.
A kind of compound Coaliferous Gas Pool commingling production structure, comprises straight well or inclined shaft, and the medium-thickness seam in straight well or inclined shaft or 2-5 girdle place perforation form perforation layer, and 1-4 perforation layer forms fracturing section.
In aforesaid compound Coaliferous Gas Pool commingling production structure, the thickness of described perforation layer is 2-8m.
In aforesaid compound Coaliferous Gas Pool commingling production structure, described adjacent fracturing section spacing is not less than 35m, and single fracturing section thickness is less than 16m.
Owing to have employed technique scheme, compared with prior art, the utility model adopts this compound Coaliferous Gas Pool commingling production method, daily output tolerance and the gas deliverability of coal bed gas well can be enlarged markedly, improve coal bed gas resource recovery ratio, save cbm development engineering funds to drop into, obtain better economy, environmental benefit.
Accompanying drawing explanation
Accompanying drawing 1 is compound Coaliferous Gas Pool commingling production mode schematic diagram.
Detailed description of the invention
Be that example is described in further detail the utility model below in conjunction with accompanying drawing and Liu Panshui mining area, Guizhou Province coal bed gas well, but not as to any restriction of the present utility model.
Embodiment of the present utility model: this coal bed gas well 5 is the cluster well of tool " two opening structures ", closely vertically passes through Longtan Coal Series, bores altogether and meets Lungtan Formation and be as thin as medium-thickness seam more than 30 layer, and cluster well one spuds in a diameter of phi 311.1mm, and one spuds in dark 54.77m; Two spud in a diameter of phi 215.9mm, and two spud in dark 966.34m.
Two exploitations are with after Φ 139.7mm intermediate casing cementing, according to preferred 9 the perforation layers of the achievement of core log, gas detection logging, geophysical log and sampling and testing, be respectively: I coal and roof and floor thereof, II coal and roof and floor thereof, III coal and roof and floor thereof, IV coal and top board thereof, V, VI coal and folded Sandstone Gas Bearing layer, VII coal and top board thereof, VIII coal and roof and floor thereof, Ⅸ coal and base plate thereof, Ⅹ coal and top board thereof; After perforation layer is preferred, adopt 102 type perforating guns, 127 type perforating bullet, 60 ° of phase place spiral perforations, hole density is 16 bullets/m, and each perforation layer 3 thickness 2-8m.
Be less than 16m to control single fracturing section thickness 4, adjacent fracturing section spacing 7 is not less than 35m, is basic principle, is divided into 3 fracturing sections according to the vertical distance of 9 perforation layers.Wherein: VIII coal and roof and floor thereof, Ⅸ coal and base plate thereof, Ⅹ coal and top board thereof belong to the 3rd fracturing section; IV coal and top board thereof, V, VI coal and folded Sandstone Gas Bearing layer, VII coal and top board thereof belong to the second fracturing section; I coal and roof and floor thereof, II coal and roof and floor thereof, III coal and roof and floor thereof belong to the first fracturing section, wherein mark the layer of Sandstone Gas Bearing up and down that 1 and 2 represent coal seam and coal seam respectively in figure, and each distance splitting pressure section is not little 35 meters.
Follow the 3rd fracturing section, the second fracturing section, the first fracturing section order carry out fracturing, carry out pressing crack construction with the casing pressure lower than 38MPa, operational discharge capacity controls at 6.0-11.0m
3/ min.Employing adds sand mode step by step and carries out fracture support, and average sand ratio controls at 10-11%.In fracturing process, stuff shutoff is adopted to form the layer position in crack; The pressure break later stage adopts low discharge capacity, high sand ratio mode carries out back-up sand.
After pressure break terminates, visit sand face and sand washing 6 to artificial bottom of a well, under enter oil pipe and mining pipe string, commingling production is carried out after installing oil pumper and air water pipeline in ground, compound Coaliferous Gas Pool commingling production scheme is formulated in conjunction with each exploitation interval reservoir pressure, air content, gas saturation and isothermal adsorption characteristics, and adjust according to water, gas output and casing pressure in actual mining process, stream pressure, fluid column change, mining process comprises draining overflow, liquid level falls in draining, build the pressure, nearly gas well gas pilot production, pressure control stable yields, six stages of production declines.
Claims (3)
1. a compound Coaliferous Gas Pool commingling production structure, comprises straight well or inclined shaft, it is characterized in that: the medium-thickness seam in straight well or inclined shaft or 2-5 girdle place perforation form perforation layer (3), and 1-4 perforation layer (3) forms fracturing section (4).
2. compound Coaliferous Gas Pool commingling production structure according to claim 1, is characterized in that: the thickness of described perforation layer (3) is 2-8m.
3. compound Coaliferous Gas Pool commingling production structure according to claim 1, is characterized in that: described adjacent fracturing section (4) spacing (7) is not less than 35m, and single fracturing section (4) thickness is less than 16m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420573312.7U CN204238921U (en) | 2014-09-30 | 2014-09-30 | A kind of compound Coaliferous Gas Pool commingling production structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420573312.7U CN204238921U (en) | 2014-09-30 | 2014-09-30 | A kind of compound Coaliferous Gas Pool commingling production structure |
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| CN204238921U true CN204238921U (en) | 2015-04-01 |
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| CN201420573312.7U Expired - Fee Related CN204238921U (en) | 2014-09-30 | 2014-09-30 | A kind of compound Coaliferous Gas Pool commingling production structure |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104453803A (en) * | 2014-09-30 | 2015-03-25 | 贵州省煤层气页岩气工程技术研究中心 | Combined coal-formed gas reservoir multilayer commingling production method and structure |
| CN105649578A (en) * | 2016-01-29 | 2016-06-08 | 西南石油大学 | Vertical-well double-layer partial-pressure commingling method and device for coalbed methane |
| CN111894528A (en) * | 2020-08-31 | 2020-11-06 | 西南石油大学 | Coal measure stratum multi-gas combined mining and capacity replacing method |
| CN112832717A (en) * | 2021-03-11 | 2021-05-25 | 中联煤层气有限责任公司 | Experimental device for simulating co-production of at least two gas producing layers and same shaft |
| CN113006749A (en) * | 2021-04-14 | 2021-06-22 | 中国矿业大学 | Coal series associated resource one-well multipurpose coordinated mining method |
-
2014
- 2014-09-30 CN CN201420573312.7U patent/CN204238921U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104453803A (en) * | 2014-09-30 | 2015-03-25 | 贵州省煤层气页岩气工程技术研究中心 | Combined coal-formed gas reservoir multilayer commingling production method and structure |
| CN104453803B (en) * | 2014-09-30 | 2017-10-10 | 贵州省煤层气页岩气工程技术研究中心 | Composite coal gas reservoir multilayer commingling production method and structure |
| CN105649578A (en) * | 2016-01-29 | 2016-06-08 | 西南石油大学 | Vertical-well double-layer partial-pressure commingling method and device for coalbed methane |
| CN111894528A (en) * | 2020-08-31 | 2020-11-06 | 西南石油大学 | Coal measure stratum multi-gas combined mining and capacity replacing method |
| CN111894528B (en) * | 2020-08-31 | 2022-05-24 | 西南石油大学 | Coal measure stratum multi-gas combined mining and capacity replacing method |
| CN112832717A (en) * | 2021-03-11 | 2021-05-25 | 中联煤层气有限责任公司 | Experimental device for simulating co-production of at least two gas producing layers and same shaft |
| CN113006749A (en) * | 2021-04-14 | 2021-06-22 | 中国矿业大学 | Coal series associated resource one-well multipurpose coordinated mining method |
| CN113006749B (en) * | 2021-04-14 | 2021-10-29 | 中国矿业大学 | Coal series associated resource one-well multipurpose coordinated mining method |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150401 Termination date: 20160930 |
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