CN103850671B - The well-arranging procedure of a kind of ground pump drainage coal bed gas - Google Patents
The well-arranging procedure of a kind of ground pump drainage coal bed gas Download PDFInfo
- Publication number
- CN103850671B CN103850671B CN201310408921.7A CN201310408921A CN103850671B CN 103850671 B CN103850671 B CN 103850671B CN 201310408921 A CN201310408921 A CN 201310408921A CN 103850671 B CN103850671 B CN 103850671B
- Authority
- CN
- China
- Prior art keywords
- well
- coal seam
- coal
- bed gas
- field
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Abstract
A well-arranging procedure for ground pump drainage coal bed gas, belongs to coal-bed gas exploitation field.Theoretical based on " gesture three ", utilize " gravitional force " of water in coal seam, according to the distribution characteristics of the gravitational field in coal seam, stress field, pressure field, in conjunction with the drilling technology feature of coal seam reservoirs occurrence and multi-branched horizontal well, U-shaped horizontal well, straight well (cluster well), select different well type, carry out the well spacing of ground pump drainage coal bed gas.The present invention efficiently solves the optimization allocation of well type and geological tectonic conditions in the pump drainage coal bed gas well spacing of ground, coal bed gas extraction feature, make full use of water sole energy " gravitional force " in discharge process in coal seam, according to " gesture " shaft building, according to the distribution characteristics of gravitational field, stress field, pressure field, in conjunction with different coal structural environment, reasonable Arrangement ground pump-drainage well well type, effectively increases drainage and step-down efficiency, is conducive to improving cbm development effect.
Description
Technical field
The present invention relates to the well-arranging procedure of a kind of ground pump drainage coal bed gas, belong to coal-bed gas exploitation field.
Background technology
The reasonability that well site deployment and well type are selected directly decides the effect of CBM Drilling cost and development.Coal bed gas is a kind of adsorbed gas, belongs to Unconventional forage.In mining process, natural energy and the artificial supplementation energy such as flexible drive, solution gas driving, hydraulic drives, air pressure driving in not having conventional gas to hide, the sole energy of coal bed gas desorb is impelled to be after water in coal seam reservoirs is discharged under self gravitation effect, coal seam reservoirs pressure reduces, and the coal seam desorption produced.So-called coal seam desorption refers to when coal seam reservoirs pressure reduces, the process that methane adsorption gas is overflowed from coal seam.The desorption in coal seam mainly contains depressurization desorption, intensification desorb, displacement desorption and diffusion desorb.Wherein, depressurization desorption is the most frequently used method, is also a kind ofly to contribute maximum mode to desorb.Namely depressurization desorption is when coal seam reservoirs pressure reduces, the process that methane adsorption gas is overflowed from coal seam, and the main path that coal seam reservoirs pressure reduces is exactly drainage and step-down.
At present, the main well type of ground pump drainage coal bed gas comprises straight well (cluster well), U-shaped horizontal well, multi-branched horizontal well.During well spacing, still the balanced well pattern in conventional gas and oil exploitation has been continued to use, the many factors such as target coal seam thickness, stability, buried depth, gas-bearing property, regional structure, orographic condition and surface state are considered, by the water in pump drainage coal seam reservoirs, to reduce coal seam reservoirs pressure, the coal bed gas generation desorb-diffusion-seepage flow adsorbed in coal seam reservoirs, and produce from the pump-drainage well of ground.But in well spacing process, lack the unique natural energy " gravitional force " in coal seam water discharge process and gravitational field, stress field, the making full use of of pressure field, well type and geological conditions, coal seam reservoirs physical property and coal bed gas extraction feature can not reach distributes rationally.
Summary of the invention
The object of this invention is to provide the well-arranging procedure of a kind of ground pump drainage coal bed gas, in order to solve in the pump drainage coal bed gas process of ground, the optimization allocation of well type and geological tectonic conditions, coal bed gas extraction feature, make full use of the unique natural energy " gravitional force " of water in discharge process in coal seam, according to " gesture " shaft building, according to the distribution characteristics of gravitational field, stress field, pressure field, in conjunction with the drilling technology feature of attitude of coal and multi-branched horizontal well, U-shaped horizontal well, straight well (cluster well), the different well type of choose reasonable, improves development effectiveness.
The object of the invention is to be realized by following proposal: the well-arranging procedure of a kind of ground pump drainage coal bed gas, it is characterized in that: theoretical based on " gesture three ", utilize " gravitional force " of water in coal seam, according to the gravitational field (being conducive to the discharge of coal seam water) in coal seam, stress field (the hugger in coal seam, fractuer direction depends on ancient stress direction), the distribution characteristics of pressure field (artificial pump drainage produces pressure funnel), in conjunction with coal seam reservoirs occurrence and multi-branched horizontal well, U-shaped horizontal well, the drilling technology feature of straight well (cluster well), select different well type, carry out the well spacing of ground pump drainage coal bed gas.
The well-arranging procedure of described a kind of ground pump drainage coal bed gas, it is characterized in that: before a development block well spacing, first coal seam's structural feature, geostatic stress and coal seam physical property research should be carried out according to seismic data, drilling data, the area that fluctuations is large, irregular or geostatic stress Relatively centralized, crack and hugger are grown, solid coefficient is less in coal seam, preferentially selects straight well or cluster well exploitation.
The well-arranging procedure of described a kind of ground pump drainage coal bed gas, it is characterized in that: the area weak at geostatic stress, coal seam solid coefficient is larger, utilize " gravitional force " of water in coal seam, according to the distribution characteristics of gravitational field, stress field, pressure field in coal seam, select multi-branched horizontal well or the exploitation of U-shaped well.
The well-arranging procedure of described a kind of ground pump drainage coal bed gas, it is characterized in that: the area weak at geostatic stress, coal seam solid coefficient is larger, for the monocline coal seam of stratigraphic dip between 2 °-8 ° and the both sides of the fold tectonic turn end of stratigraphic dip between 2-8 °, multi-branched horizontal well is selected to exploit, mining straight well is positioned at low position, and horizontal well master props up and arranges along coal seam updip direction with branch.
The well-arranging procedure of described a kind of ground pump drainage coal bed gas, it is characterized in that: the area weak at geostatic stress, coal seam solid coefficient is larger, stratigraphic dip is greater than to the steeper reservoir of 8 °, U-shaped well is preferentially selected to exploit, process well (horizontal well) is positioned at high-order bit, from high to low, is communicated with the mining well being in lower position, namely facilitate horizontal well construction, be conducive to again the drainage and step-down of mining straight well.
The well-arranging procedure of described a kind of ground pump drainage coal bed gas, it is characterized in that: the area weak at geostatic stress, coal seam solid coefficient is larger, for the mild stratum that acline, inclination angle are less than 2 °, multi-branched horizontal well is selected to exploit, mining straight well is positioned at low position, the landing point of horizontal well is in seat earth mud stone, according to seam inclination situation of change, determine the horizontal well landing point degree of depth, to guarantee that horizontal well master props up hole angle and keeps being greater than 90 ° all the time for principle, the branch of horizontal well enters coal seam with the hole angle of more than 90 °.
The invention has the beneficial effects as follows: the present invention efficiently solves the optimization allocation of well type and geological tectonic conditions in the pump drainage coal bed gas well spacing of ground, coal bed gas extraction feature, make full use of water sole energy " gravitional force " in discharge process in coal seam, according to " gesture " shaft building, according to the distribution characteristics of gravitational field, stress field, pressure field, in conjunction with different coal structural environment, reasonable Arrangement ground pump-drainage well well type, effectively increases drainage and step-down efficiency, is conducive to improving cbm development effect.
Accompanying drawing explanation
Fig. 1 is the schematic diagram carrying out ground pump drainage coal bed gas well spacing according to coal structure;
Fig. 2 is applicable to the multi-branched horizontal well schematic diagram that acline or seam inclination be less than the mild stratum of 2 °.
In figure: 1. the turn end of fold tectonic; 2. multi-branched horizontal well; 3. the stratigraphic dip steeper coal seam that is greater than 8 °; 4.U type well; 5. the monocline coal seam of stratigraphic dip between 2 °-8 °; 6. acline or the inclination angle mild stratum that is less than 2 °; 7. multi-branched horizontal well; 8. large, the irregular area of coal seam fluctuations; 9. straight well (or cluster well); 10. mining straight well; 11. coal petrographys; 12. horizontal well masters prop up; 13. seat earth mud stone; 14. horizontal well landing points.
Detailed description of the invention
Below in conjunction with specific embodiment, just the present invention is described further.Fig. 1 can be used as the present embodiment carries out ground pump drainage coal bed gas well spacing schematic diagram according to coal structure, and Fig. 2 can be used as the present embodiment and is applicable to the multi-branched horizontal well schematic diagram that acline or seam inclination be less than the mild stratum of 2 °.
According to seismic data, drilling data analysis, certain cbm development block structural configuration as shown in Figure 1, (1) be the fold tectonic turn end of stratigraphic dip between 2-8 °, (3) be monocline coal seam that stratigraphic dip is greater than 8 °, (5) be the monocline coal seam of stratigraphic dip between 2-8 °, (6) be the monocline coal seam that stratigraphic dip is less than 2 °, (8) are large, the irregular area of coal seam fluctuations.
Theoretical based on " gesture three ", utilize " gravitional force " of water in coal seam, according to the distribution characteristics of the gravitational field (being conducive to the discharge of coal seam water) in coal seam, stress field (hugger in coal seam, fractuer direction depend on ancient stress direction), pressure field (artificial pump drainage produces pressure funnel), in conjunction with the drilling technology feature of coal seam reservoirs occurrence and multi-branched horizontal well, U-shaped horizontal well, straight well (cluster well), select different well type, carry out the well spacing of ground pump drainage coal bed gas.
Base area stress and coal seam physical property achievement in research, if this development block geostatic stress Relatively centralized, crack and hugger is grown, coal seam solid coefficient is less than 1.0, then preferentially select straight well (or cluster well) to exploit.If this development block geostatic stress is weak, coal seam solid coefficient is more than or equal to 1.0, for making full use of " gravitional force " of water in coal seam, according to the distribution characteristics of gravitational field, stress field, pressure field in coal seam, select multi-branched horizontal well or the exploitation of U-shaped well.Concrete well-arranging procedure is as follows:
First, in the monocline coal seam (5) of stratigraphic dip between 2 °-8 ° and the both sides of the fold tectonic turn end (1) of stratigraphic dip between 2-8 °, multi-branched horizontal well (2) is selected to exploit; For being conducive to drainage and step-down, mining straight well is positioned at low position, and horizontal well master props up and arranges along coal seam updip direction with branch.
Secondly, stratigraphic dip is greater than to the steeper coal seam (3) of 8 °, preferentially selects U-shaped well (4) to exploit; For being conducive to drainage and step-down, process well (horizontal well) is positioned at high-order bit, from high to low, is communicated with, namely facilitates horizontal well construction, be conducive to again the drainage and step-down of mining straight well with the mining well being in lower position.
Then, acline or inclination angle are less than to the mild stratum (6) of 2 °, select multi-branched horizontal well (7) to exploit.The profile morphology of multi-branched horizontal well (7) as shown in Figure 2, mining straight well (10) is positioned at low position, coal seam, the landing point of multi-branched horizontal well (7) is in seat earth mud stone (13), according to the change of pitch angle situation of coal seam (11), determine horizontal well landing point (14) degree of depth, guarantee horizontal well master prop up (12) hole angle keep be greater than 90 ° all the time, the branch of horizontal well enters coal seam (11) with the hole angle of more than 91 °.
Finally, for large, the irregular area (8) of coal seam fluctuations, straight well (or cluster well) (9) are selected to exploit.
Claims (1)
1. the well-arranging procedure of a ground pump drainage coal bed gas, based on gesture three field theory, utilize the gravitional force of water in coal seam, according to the distribution characteristics of the gravitational field in coal seam, stress field, pressure field, in conjunction with the drilling technology feature of coal seam reservoirs occurrence and multi-branched horizontal well, U-shaped horizontal well, straight well, select different well type, carry out the well spacing of ground pump drainage coal bed gas; It is characterized in that:
Before development block well spacing, first coal seam's structural feature, geostatic stress and coal seam physical property research is carried out according to seismic data, drilling data, large, the irregular area of fluctuations or geostatic stress Relatively centralized, crack and hugger are grown, solid coefficient is less area in coal seam, select straight well or cluster well exploitation;
The area weak at geostatic stress, coal seam solid coefficient is larger, utilizes the gravitional force of water in coal seam, according to the distribution characteristics of gravitational field, stress field, pressure field in coal seam, selects multi-branched horizontal well or the exploitation of U-shaped well;
The area weak at geostatic stress, coal seam solid coefficient is larger, for the monocline coal seam of stratigraphic dip between 2-8 ° and the both sides of the fold tectonic turn end of stratigraphic dip between 2-8 °, multi-branched horizontal well is selected to exploit, mining straight well is positioned at low position, and horizontal well master props up and arranges along coal seam updip direction with branch;
The area weak at geostatic stress, coal seam solid coefficient is larger, is greater than the steeper reservoir of 8 ° for stratigraphic dip, select U-shaped well to exploit, process well is positioned at high-order bit, from high to low, is communicated with the mining well being in lower position;
The area weak at geostatic stress, coal seam solid coefficient is larger, for the mild stratum that acline, inclination angle are less than 2 °, multi-branched horizontal well is selected to exploit, mining straight well is positioned at low position, the landing point of horizontal well, in seat earth mud stone, according to the situation of change of seam inclination, determines the horizontal well landing point degree of depth, to guarantee that horizontal well master props up hole angle and keeps being greater than 90 ° all the time for principle, horizontal well branch enters coal seam with more than 90 ° hole angles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310408921.7A CN103850671B (en) | 2013-09-11 | 2013-09-11 | The well-arranging procedure of a kind of ground pump drainage coal bed gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310408921.7A CN103850671B (en) | 2013-09-11 | 2013-09-11 | The well-arranging procedure of a kind of ground pump drainage coal bed gas |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103850671A CN103850671A (en) | 2014-06-11 |
| CN103850671B true CN103850671B (en) | 2016-02-24 |
Family
ID=50858764
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310408921.7A Expired - Fee Related CN103850671B (en) | 2013-09-11 | 2013-09-11 | The well-arranging procedure of a kind of ground pump drainage coal bed gas |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103850671B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107237627A (en) * | 2017-05-20 | 2017-10-10 | 陕西延长石油(集团)有限责任公司研究院 | A kind of well spacing method for karst carbonate reservoir |
| CN107558984A (en) * | 2017-07-27 | 2018-01-09 | 山西晋城无烟煤矿业集团有限责任公司 | A kind of Mining Area Coal Seam gas well batch production development approach |
| CN107339093A (en) * | 2017-08-25 | 2017-11-10 | 辽宁工程技术大学 | A kind of drilling well for gas drainage method for arranging of imitative schneider zelkova leaf kank structure |
| CN108086957A (en) * | 2017-12-23 | 2018-05-29 | 山西蓝焰煤层气集团有限责任公司 | A kind of method of the U-shaped coal bed gas well construction in double coal seams |
| CN108590595B (en) * | 2018-04-10 | 2020-04-21 | 广东石油化工学院 | Method for exploiting non-diagenetic natural gas hydrate by utilizing F-shaped well group |
| CN108798625B (en) * | 2018-05-31 | 2021-03-26 | 中国神华能源股份有限公司 | Mine and mine construction method |
| CN112796730B (en) * | 2021-02-08 | 2022-04-12 | 太原理工大学 | Method for laying ground drilling well pattern in multi-horizontal cross-production area |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102926732A (en) * | 2012-10-12 | 2013-02-13 | 唐书恒 | Coalbed methane developing and well spacing method for high-water content coal reservoir of head plate |
-
2013
- 2013-09-11 CN CN201310408921.7A patent/CN103850671B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102926732A (en) * | 2012-10-12 | 2013-02-13 | 唐书恒 | Coalbed methane developing and well spacing method for high-water content coal reservoir of head plate |
Non-Patent Citations (3)
| Title |
|---|
| 刘家区煤层气产能主控地质因素分析;王秀茹;《中国煤层气》;20070430;第4卷(第2期);第26-29页 * |
| 密切值法在煤层气井井型优选中的应用研究;杨刚等;《石油钻探技术》;20130331;第41卷(第2期);摘要 * |
| 采动区地面井煤层气开发井位布置技术研究现状及发展趋势;刘军;《煤矿安全》;20130131;第44卷(第1期);摘要 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103850671A (en) | 2014-06-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103850671B (en) | The well-arranging procedure of a kind of ground pump drainage coal bed gas | |
| Tao et al. | Current status and geological conditions for the applicability of CBM drilling technologies in China: A review | |
| CN102080526B (en) | Method for extracting gas from bedding level fractured well of ground coal seam roof | |
| CN103362540B (en) | High gas layer pressure relief gas pumping mining method | |
| CN103306714B (en) | Coal seam group with near interval Di Chou holes in lane the mash gas harnessing method in a hole three | |
| CN102022133B (en) | Regional gas underground high-pressure jet hole digging, pressure relief and outburst prevention method | |
| CN101575983A (en) | Directional fracturing permeability improvement outburst elimination method in coal mine and device thereof. | |
| CN102493831B (en) | Method for extracting coal seam gas through ground fracturing and underground horizontal drill holes | |
| CN102392678A (en) | Gas drainage method combining surface and underground fracturing and permeability improvement | |
| CN111305891B (en) | Three-dimensional comprehensive efficient and accurate treatment technical method for coal-oil-gas coexisting mine | |
| CN206860155U (en) | Coal-series gas U-shaped well drilling and fracturing structure | |
| CN104100244A (en) | Well spacing method for coal bed gas communication well groups and application of well spacing method in fracturing yield increase | |
| CN103982137B (en) | Design method for underground hydraulic fracturing drilled hole azimuth angle of coal mine | |
| CN104453803A (en) | Combined coal-formed gas reservoir multilayer commingling production method and structure | |
| CN102518412A (en) | Method for mining coal and gas by hydraulic jet grouting washout | |
| CN206220946U (en) | The gas of coal measures three adopts the U-shaped well pattern structure of multiple-limb altogether | |
| CN109162713B (en) | Coal-water dual-resource mine mining method without changing overlying strata hydrogeological conditions | |
| CN102434192A (en) | Device and method for enhancing coal seam fracturing effect | |
| CN201763308U (en) | Fishbone well type structure | |
| CN103485773A (en) | Method for determining multi-branch horizontal well branch parameters | |
| CN201865653U (en) | CBM (coal bed methane) horizontal well system | |
| CN206000529U (en) | A kind of coal bed gas well with multi-lateral horizontal well system based on straight well transformation | |
| CN204252974U (en) | A kind of horizontal well well structure for the block fractured reservoir exploitation of deep layer | |
| CN102926732A (en) | Coalbed methane developing and well spacing method for high-water content coal reservoir of head plate | |
| CN103362541B (en) | High gassy and low permeability coal seam regionality increases the method for gas permeability of coal seam |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160224 Termination date: 20170911 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |