CN103628856A - Water resistance gas production well spacing method for coal-bed gas block highly yielding water - Google Patents
Water resistance gas production well spacing method for coal-bed gas block highly yielding water Download PDFInfo
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- CN103628856A CN103628856A CN201310676164.1A CN201310676164A CN103628856A CN 103628856 A CN103628856 A CN 103628856A CN 201310676164 A CN201310676164 A CN 201310676164A CN 103628856 A CN103628856 A CN 103628856A
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Abstract
The invention discloses a water resistance gas production well spacing method for a coal-bed gas block highly yielding water, relates to the technical field of coal-bed gas developing and well spacing methods, and aims to provide a water resistance gas production well spacing method for a coal-bed gas block highly yielding water, which has the advantages of high gas output, simple well spacing and simple control. According to the method, a well pattern formed by a producing well is included, and a freeze wall formed by a freeze well is also included; the freeze wall is arranged at a structural high position of the coal-bed gas block highly yielding water, and is higher than a coal-bed gas producing well. On the basis of the traditional well pattern, the freeze wall for resisting water is arranged at the structural high position of the coal-bed gas block highly yielding water to avoid the influence of water in a water-bearing layer on coal-bed gas exploitation. The well spacing scheme can effectively increase draining depressurization efficiency and improves the gas output of the coal-bed gas producing well in the block. In addition, the pressure of a high moisture content coal reservoir is reduced, the producing well can be converted into the freeze well to continue resisting water in the economy-exhausted period of the producing well, and the use value of the producing well is improved.
Description
Technical field
The present invention relates to cbm development well spacing method, particularly a kind of aerogenesis well spacing method that blocks water of high yield water coal bed gas block.
Background technology
Coal bed gas, also claims coal mine gas, is and the gas resource of coal association, symbiosis, and concrete composition is with CH
4be main, existence form be take ADSORPTION STATE as main, and small part exists with free state and solubilised state form, is a kind of potential clean energy resource, and reserves are very abundant.China's buried depth is less than 2000m coal bed gas geological resources and is about 36.81 trillion m
3stock number 38,000,000,000,000 m of the land conventional gas of ，Yu China
3substantially suitable.Under coal bed gas well, extraction or Ground Developing utilization can be alleviated the great demand of China to the energy very effectively, can make Gas Explosion Accidents in Coal Mines incidence significantly reduce simultaneously, effectively reduce greenhouse effect, Environmental Safety.
For the too high block of aquifer yield, can be because the water in aquifer carries out rapidly supply when producing, coal seam reservoirs pressure is difficult to drop to below critical desorption pressures, coal bed gas is difficult to output, gas production is too low, even if cause this block to have abundant coal bed gas resource amount, be also difficult to obtain higher output.And traditional method can only intercept top board limestone aquifer, for other aquifers, cannot intercept.
Application number is the cbm development well spacing method that 201210387874.8 patent document discloses the high moisture coal seam reservoirs of a kind of top board, comprise the little well pattern being formed by producing well, described The Small Well net layout is square, rectangle, rhombus, five-point type or plum blossom-shaped, has increased the pumped well that extracts top board limestone water in little well pattern; Described pumped well is located at coal bed gas and produces in little well pattern, and described pumped well creeps in roof limestone aquifer.This pattern of well can effectively increase drainage and step-down efficiency, improves the pumped well gas output of several mouthfuls of coal bed gas producing wells around.Pumped well can have precedence over coal bed gas producing well drilling operation around, and draws water; When reducing the high moisture coal seam reservoirs pressure of top board, drilling well that can be using recovered water as other coal bed gas well, the water source of pressing crack construction.Although the method has solved coal bed gas well aquifer yield when excessive, the problem that coal seam reservoirs pressure is difficult to drop to that critical desorption pressures is following, the major part in coal bed gas is difficult to desorb output, but the laying of this well spacing method pumped well when well spacing is more loaded down with trivial details, practice of construction is got up very difficult.And the pumped well quantity of laying is more, the quantity of the suction pump needing is also more; Different pumped wells has different situations, and corresponding, different suction pumps also has different situations, controls very complicated.
Summary of the invention
In order to overcome above-mentioned defect, the technical problem to be solved in the present invention is: provide that a kind of gas production is high, well spacing is easy, control the aerogenesis well spacing method that blocks water of simple high yield water coal bed gas block.
The present invention is that the technical scheme that solves the problems of the technologies described above employing is: a kind of aerogenesis well spacing method that blocks water of high yield water coal bed gas block, comprise the well pattern being formed by producing well, and also comprise the freezing wall being formed by freezing well; Described freezing wall is located at a structure high position for high yield water coal bed gas block, higher than coal bed gas producing well.
Described freezing wall is through aquifer.
The bottom of described freezing wall is positioned under coal seam and aquifer.
Described coal bed gas producing well creeps into target coal seam and produces, and creep into the following 40m～60m in object coal seam.
In the economic dry spells of described producing well, described producing well is converted to freezing well and continues to block water.
The invention has the beneficial effects as follows: the present invention is on the basis of conventional well network arrangements, high-order the increasing together for intercepting the freezing wall in aquifer of structure at high yield water coal bed gas block, avoid the impact on coal-bed gas exploitation of water in aquifer, this and other well spacing method is completely different, traditional additive method can only intercept top board limestone aquifer, the present invention can all intercept all aquifers, has greatly improved gas production.This pattern of well can effectively increase drainage and step-down efficiency, improves the gas output of coal bed gas producing well in this block.In addition, when reducing high yield water coal seam reservoirs pressure, in the economic dry spells of producing well, described producing well can be converted to freezing well and continue to block water, improve its value.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, illustrate the aerogenesis well spacing method that blocks water of a kind of high yield water coal bed gas block of the present invention.
Fig. 1 is hole pattern schematic diagram of the present invention;
Fig. 2 is hole pattern sectional drawing of the present invention;
Fig. 3 is the contrast that the present invention has or not freezing well gas output per well;
Fig. 4 is the contrast that the present invention has or not freezing well total gas production.
In figure: 1-producing well, the freezing well of 2-, 3-aquifer, 4-coal seam.
The specific embodiment
As shown in Figure 1-2, a kind of aerogenesis well spacing method that blocks water of high yield water coal bed gas block, comprises the well pattern consisting of producing well, also comprises the freezing wall consisting of freezing well; Described freezing wall is located at a structure high position for high yield water coal bed gas block, higher than coal bed gas producing well.
Producing well well pattern is exactly generally the spacing of 300 to 500 meters, if will reach good effect, generally will suitably increase freezing wall width according to block gas recovery well web area.
Described freezing wall is through aquifer.
The bottom of described freezing wall is positioned under coal seam and aquifer.The freezing wall degree of depth will be determined according to the degree of depth in local coal seam and aquifer, creeps under coal seam and aquifer.
Described coal bed gas producing well creeps into target coal seam and carries out draining production, generally need to creep into the following 40m～60m in object coal seam.
In the economic dry spells of described producing well, described producing well is converted to freezing well and continues to block water.
Instantiation:
China's Eastern Margin of Ordos Basin part coal bed gas block aquifer yield is larger, and reason roughly has following three kinds: 1, coal seam buried depth is shallow, and adjoining rock watery is strong; 2, near, there is diaclase; 3, fracturing methods is improper.Above three kinds of reasons all can cause reservoir and outside aquifer to occur directly to link up, externally in the excessive situation of aquifer water content, in mining process, water in outside aquifer is discharged continuously, disturbed the discharge of the water in coalbed methane reservoir, cause flowing bottomhole pressure (FBHP) to decline difficult, be difficult to obtain industrialness coal bed gas.
For this block, can take for the water in outside aquifer, to carry out the method for shutoff obstruct at the high-order freezing wall together that arranges of block structure, increase the discharge of water in coalbed methane reservoir, flowing bottomhole pressure (FBHP) is dropped near critical desorption pressures, coal bed gas is able to smooth output, has improved this block coal bed gas well yield.
The square well pattern of 300m * 300m of take is example, and by COMET3 software simulation, if at the high-order freezing well of a row that increases of square well pattern structure of 300m * 300m, the production effect of coal bed gas producing well obviously improves, and well yield obviously increases.After increasing pumped well, this block coal bed gas producing well accumulative total is increased production 420.7 ten thousand sides, increases production 7.0% when without center pumped well.If coal bed gas sale price is by 1.2 yuan/m
3calculate, can increase income 504.8 ten thousand yuan, far above approximately 2,000,000 yuan of freezing drilling costs.As can be seen here, this programme has very considerable economic benefit.
Should be understood that, the above-mentioned specific embodiment of the present invention is only for exemplary illustration or explain principle of the present invention, and do not form the restriction to invention.Therefore any modification of, making, be equal to replacement, improvement etc., within protection scope of the present invention all should be included in without departing from the spirit and scope of the present invention in the situation that.In addition, claims of the present invention are intended to contain whole variations and the modification in the equivalents that falls into claims scope and border or this scope and border.
Claims (6)
1. the aerogenesis well spacing method that blocks water of high yield water coal bed gas block, comprises the well pattern consisting of producing well, it is characterized in that: also comprise the freezing wall consisting of freezing well; Described freezing wall is located at a structure high position for high yield water coal bed gas block, higher than coal bed gas producing well.
2. the aerogenesis well spacing method that blocks water of high yield water coal bed gas block according to claim 1, is characterized in that: described freezing wall is through aquifer.
3. the aerogenesis well spacing method that blocks water of high yield water coal bed gas block according to claim 1, is characterized in that: the bottom of described freezing wall is positioned under coal seam and bottom, aquifer.
4. the aerogenesis well spacing method that blocks water of high yield water coal bed gas block according to claim 1, is characterized in that: described coal bed gas producing well creeps into target coal seam and produces.
5. the aerogenesis well spacing method that blocks water of high yield water coal bed gas block according to claim 5, is characterized in that: described coal bed gas producing well creeps into the following 40m～60m in object coal seam.
6. the aerogenesis well spacing method that blocks water of high yield water coal bed gas block according to claim 1, is characterized in that: in the economic dry spells of described producing well, described producing well is converted to freezing well and continues to block water.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109209327A (en) * | 2018-10-12 | 2019-01-15 | 广东石油化工学院 | A kind of high yield water coalbed methane well group Active Drainage gas production method of communication barrier |
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| US5507149A (en) * | 1994-12-15 | 1996-04-16 | Dash; J. Gregory | Nonporous liquid impermeable cryogenic barrier |
| US6854929B2 (en) * | 2001-10-24 | 2005-02-15 | Board Of Regents, The University Of Texas System | Isolation of soil with a low temperature barrier prior to conductive thermal treatment of the soil |
| CN101163860A (en) * | 2005-04-22 | 2008-04-16 | 国际壳牌研究有限公司 | Low temperature system for underground barriers |
| 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 |
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2013
- 2013-12-11 CN CN201310676164.1A patent/CN103628856A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5507149A (en) * | 1994-12-15 | 1996-04-16 | Dash; J. Gregory | Nonporous liquid impermeable cryogenic barrier |
| US6854929B2 (en) * | 2001-10-24 | 2005-02-15 | Board Of Regents, The University Of Texas System | Isolation of soil with a low temperature barrier prior to conductive thermal treatment of the soil |
| CN101163860A (en) * | 2005-04-22 | 2008-04-16 | 国际壳牌研究有限公司 | Low temperature system for underground barriers |
| CN101163852A (en) * | 2005-04-22 | 2008-04-16 | 国际壳牌研究有限公司 | Low temperature barriers for in situ processes |
| 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 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109209327A (en) * | 2018-10-12 | 2019-01-15 | 广东石油化工学院 | A kind of high yield water coalbed methane well group Active Drainage gas production method of communication barrier |
| CN109209327B (en) * | 2018-10-12 | 2020-10-23 | 广东石油化工学院 | Active drainage gas production method for high-water-yield coal bed gas well group of communication fault |
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