CN106437685A - Method for determining sources of water produced in coalbed methane discharge and mining and coalbed methane discharge and mining method - Google Patents
Method for determining sources of water produced in coalbed methane discharge and mining and coalbed methane discharge and mining method Download PDFInfo
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- CN106437685A CN106437685A CN201610922098.5A CN201610922098A CN106437685A CN 106437685 A CN106437685 A CN 106437685A CN 201610922098 A CN201610922098 A CN 201610922098A CN 106437685 A CN106437685 A CN 106437685A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 148
- 238000000034 method Methods 0.000 title claims abstract description 56
- 238000005065 mining Methods 0.000 title claims abstract description 47
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title abstract description 10
- 239000003245 coal Substances 0.000 claims abstract description 75
- 238000004519 manufacturing process Methods 0.000 claims abstract description 17
- 238000004458 analytical method Methods 0.000 claims abstract description 14
- 239000004615 ingredient Substances 0.000 claims abstract description 5
- 239000002352 surface water Substances 0.000 claims description 23
- 238000000605 extraction Methods 0.000 claims description 22
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 7
- 239000011707 mineral Substances 0.000 claims description 7
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 5
- 238000012360 testing method Methods 0.000 claims description 4
- 238000011010 flushing procedure Methods 0.000 claims description 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 abstract 1
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 229910052749 magnesium Inorganic materials 0.000 abstract 1
- 239000011777 magnesium Substances 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 7
- 238000003325 tomography Methods 0.000 description 6
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 5
- 238000005070 sampling Methods 0.000 description 4
- 239000003643 water by type Substances 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 239000003651 drinking water Substances 0.000 description 3
- 235000020188 drinking water Nutrition 0.000 description 3
- 239000008398 formation water Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 238000009533 lab test Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000003032 molecular docking Methods 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000004457 water analysis Methods 0.000 description 1
- 235000020681 well water Nutrition 0.000 description 1
- 239000002349 well water Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/10—Locating fluid leaks, intrusions or movements
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/006—Production of coal-bed methane
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- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Fluid Mechanics (AREA)
- Environmental & Geological Engineering (AREA)
- Geochemistry & Mineralogy (AREA)
- Geophysics (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention relates to a method for determining sources of water produced in coalbed methane discharge and mining and a coalbed methane discharge and mining method. The method mainly comprises the steps that sources of water are judged by detecting or analyzing the content of all or several of ingredients including Na<+>, K<+>, Ca<2+>, magnesium<2+>, SO42-, Cl-, HCO3- and CO32- in water and then formulating corresponding discharge and mining methods and relevant water plugging measures according to different water production sources. Water source judgment can be assisted by conducting water sample acquisition and analysis after a coal bed gas production well reaches a stable discharge and mining stage, and accordingly appropriate discharge and mining methods are formulated. More information about a formation and a well body structure can be also obtained, and a help is provided for exploration and development of the coal bed gas well. For example, a reference can be provided for well spacing, so that faults can be effectively avoided during well spacing, the pressure of discharge and mining work can be reduced, and the number of drilled abandoned wells can be also decreased. In addition, the gas production rate of the coal bed gas well can be also predicted according to the result.
Description
Technical field
The invention belongs to Coal-seam Gas Recovery Technologies field, determine output water source in coal bed gas extraction particularly to a kind of
Method and CBM Drainage mining method, are particularly suited for the high coal bed gas well of aquifer yield.
Background technology
During the mining of coal bed gas well, it is frequently encountered the big well of aquifer yield, because these water can be to coal bed gas well
Produce impact, be typically necessary and it is processed, and processing mode because of the source of water difference difference, therefore, really
Where fixed output quota water outlet is derived from, and finding out optimal processing scheme (as water blockoff scheme) just becomes an important work of coal bed gas well mining
Make.
Generally, these output waters are frequently not from coal seam, and the output water analysiss to coal bed gas well, can also obtain more
Many information with regard to stratum and casing programme, the mining for coal bed gas well provides help.
At present, still there is no a kind of method determining output water source in coal bed gas extraction.
Content of the invention
(1) technical problem to be solved
In order to solve the problems referred to above of prior art, the present invention provides output water source in a kind of determination coal bed gas extraction
Method, it can help judge the source of coal bed gas WIH, thus formulating suitable discharge and mining method.
The present invention also provides a kind of CBM Drainage mining method, and it can first determine the source of output water in coal bed gas extraction,
Again according to the separate sources of coal bed gas WIH, to carry out operation thereafter, to be conducive to improving the reasonability of discharge and mining method, help
Get out the quantity of disused well in minimizing.
(2) technical scheme
In order to achieve the above object, the main technical schemes that the present invention adopts include：
A kind of method in output water source in determination coal bed gas extraction, it is by being checked or analyzed in following ingredients in water
All or appoint the source to judge output water for several contents：Na+、K+、Ca2+、Mg2+、SO4 2-、Cl-、HCO3 -、CO3 2-, it includes
Following steps：
S1, Criterion model；
Corresponding composition or the content becoming packet in S2, detection water；
S3 is compared with master pattern, determines that output water is originated.
By said method it may be determined that the source of output water, and then provide foundation for the mining of coal bed gas well, especially
It is that the method is simple, reliable, and accuracy is high, easy to utilize.
The method in output water source in the determination coal bed gas extraction of one embodiment of the invention, it is by being checked or analyzed water
In middle following ingredients arbitrary group or appoint several groups of the content source to judge output water：
Become packet one, Na++K+；
Become packet two, Ca2++Mg2+.
Become packet three, SO4 2-+Cl-；
Become packet four, HCO3 -+CO3 2-.
The method in output water source in the determination coal bed gas extraction of one embodiment of the invention, wherein：
Step S1 includes：
S11, the drafting primary trilinear chart of skin, wherein, component one and component two are relative edge, component three and the component four of diamond-shaped pattern
For another group of relative edge of diamond-shaped pattern, the maximum of component one and component three is the first summit, component two and the component of diamond-shaped pattern
Four maximum is the second summit of diamond-shaped pattern, and the first summit is relative with the second summit；
S12, from mineral water, surface water, the high yield water not water of gas-producing well output, the product after fractured well mining intended duration
Water outlet and high-yield well stablize aerogenesis after five kinds of water of output water as master sample, diamond-shaped pattern is set up subregion；
Step S3 includes：
S31, determine testing result falls into which subregion of diamond-shaped pattern；
S32, determine the source of output water according to the subregion that testing result is fallen into.
Wherein, the partitioned mode in step S12 includes：
Choose mineral water as master sample, obtain into packet one (weight portion) 0%～17%, become packet two (weight portion)
83%～100%, packet three (weight portion) 0%～12%, the region of one-tenth packet four (weight portion) 88%～100% are become, as
A1 area, chooses surface water as master sample, obtains into packet one (weight portion) 17%～42%, becomes packet two (weight portion)
58%～83%, packet three (weight portion) 0%～15%, the region of one-tenth packet four (weight portion) 85%～100% are become, as A2
Area.
In order to simplify operation, convenient to carry out, and do not affect its accuracy, preferably, on the basis of A1 area, A2 area, knot
Close impact to gas production, extension obtain into packet one (weight portion) 0%～42%, become packet two (weight portion) 57%～
100% region, as A area, represents drinkable water region.
Wherein, the partitioned mode in step S12 includes：
The water choosing high yield water not gas-producing well output as master sample, obtain into packet one (weight portion) 42%～
76%th, become packet two (weight portion) 27%～57%, become packet three (weight portion) 0%～57%, become packet four (weight portion)
43%～100% region, as B0Area.
In order to simplify operation, convenient to carry out, and do not affect its accuracy, preferably, in B0On the basis of area, in conjunction with to product
The impact of tolerance, extension obtains into packet one (weight portion) 42%～76%, becomes the area of packet two (weight portion) 27%～57%
Domain, as B area, indicates the coal seam aqua region that surface water invades.
Wherein, the partitioned mode in step S12 includes：
Choose output water after a year for the fractured well mining as master sample, obtain into packet one (weight portion) 80%～
100%th, become packet two (weight portion) 0%～20%, become packet three (weight portion) 31%～82%, become packet four (weight portion)
18%～69% region, as C1 area, chooses the output water after aerogenesis stablized by high-yield well as master sample, obtains into packet
One (weight portion) 76%～100%, one-tenth packet two (weight portion) 0%～24%, one-tenth packet three (weight portion) 0%～31%, one-tenth
The region of packet four (weight portions) 69%～100%, as C2 area.
In order to simplify operation, convenient to carry out, and do not affect its accuracy, preferably, on the basis of C1 area, C2 area, knot
Close impact to gas production, extension obtain into packet one (weight portion) 76%～100%, become packet two (weight portion) 0%～
27% region, as C area, represents coal seam aqua region.
The method in output water source in the determination coal bed gas extraction of any of the above-described embodiment, it is to reach in coal seam gas production well
Water sampling and analysis is done to after mining stable phase.
The present invention also provides a kind of discharge and mining method of coal bed gas well, and it comprises the steps：
First, the whole or several content by being checked or analyzed in following ingredients in water judges coming of output water
Source：Na+、K+、Ca2+、Mg2+、SO4 2-、Cl-、HCO3 -、CO3 2-, it comprises the steps：
S1, Criterion model；
Corresponding composition or the content becoming packet in S2, detection water；
S3 is compared with master pattern, determine output water source be following in which：Represent the A in drinkable water region
Area, the C area indicating the surface water B area of coal seam aqua region invading, representing coal seam aqua region；
Two：According to the determination result in output water source, execution step three, step 4 or step 5；
Three：When output water is originated as A area, represent that this well is just completion or just carried out well-flushing, root with clear water
According to aquifer yield situation, continue mining for a period of time after, repeated execution of steps one and step 2；
Four：When output water is originated as B area, represent that this well is immersed by stratum water, find out EXIT POINT and carry out water blockoff
Operation；
Five：When output water is originated as C area, no matter the current aquifer yield of this mouthful of well is how many, continue mining it is not necessary to worry other
Water layer invades problem.
By said method, can first determine the source of output water, and then provide foundation for the mining of coal bed gas well, then enter
Row operation thereafter, is conducive to improving the reasonability of discharge and mining method, contributes to reducing the quantity getting out disused well.Especially, determine
The method in output water source is simple, reliable, and accuracy is high, easy to utilize.
The discharge and mining method of the coal bed gas well of one embodiment of the invention, in step one, determines output water in coal bed gas extraction
During source, it is to do water sampling and analysis after coal seam gas production well reaches mining stable phase.
The discharge and mining method of the coal bed gas well of one embodiment of the invention, in step 4, looks for always according to drilling well and log data
Go out water-yielding stratum, provide foundation for block exploitation in future.
(3) beneficial effect
The invention has the beneficial effects as follows：
The method in output water source in the determination coal bed gas extraction of the present invention, it can be by reaching mining in coal bed gas well
Do water sampling and analysis after stable phase, help judge the source of water, thus formulating suitable discharge and mining method and related water blockoff
Measure.More information with regard to stratum and casing programme can also be obtained, the exploration for coal bed gas well and exploitation provide help.Example
As provided with reference to so that tomography can be effectively shielded from well spacing for well spacing, reduce the pressure of mining work, also may be used
Reduce the quantity getting out disused well.Furthermore it is also possible to predict the gas production of coal bed gas well according to this result.
Brief description
Fig. 1 is the subregion schematic diagram in the method in output water source of first embodiment of the invention；
Fig. 2 is the subregion schematic diagram in the method in output water source of second embodiment of the invention；
Fig. 3 is the schematic diagram (numbering GSS-042 well) of the first application examples of second embodiment of the invention；
Fig. 4 is the schematic diagram (numbering GSS-030V well) of the second application examples of second embodiment of the invention；
Fig. 5 is comparison schematic diagram (numbering GSS-042 well and numbering GSS- of two application examples of second embodiment of the invention
030V well)；
Fig. 6 is the result schematic diagram (numbering GSS-042 well) of the present invention first application examples.
Fig. 7 is the generalized section of the well in the present invention second application examples.
Fig. 8 is the result schematic diagram (numbering GSS-030V well) of the present invention second application examples.
Specific embodiment
In order to preferably explain the present invention, in order to understand, below in conjunction with the accompanying drawings, by specific embodiment, to this
Bright it is described in detail.
Referring to Fig. 1 (Fructus Kaki village South 67 mouthfuls of coal bed gas well output waters of block and earth's surface drinking water water sample analysis figure), the present invention one
The method in output water source in the determination coal bed gas extraction of individual embodiment, it includes following step：
Step 1, block is chosen
Fructus Kaki village South block is one of earliest block of Coalbed Methane In China exploration and development, up to the present, has reached business
The stage of exploitation.Due to having carried out close to vicennial exploration and development, this block has various different production well type, including sleeve pipe
Well, open hole well, Short Radius Horizontal Wells (SRHD), horizontally-butted wells (SIS) etc..This block is selected to be primarily intended to by different wells
Contrast between type, different process, different aquifer yield, the well institute output water of gas production is analyzing shallow layer surface water source and shallow
Layer surface water invades the impact to coal bed gas well gas production.
Step 2, water sample is chosen and laboratory test
In order to be contrasted, we acquire the Fructus Kaki village south output water of 67 mouthfuls of coal bed gas wells, three differences in block simultaneously
Local surface water and the mineral water water sample of two different plates, deliver to same detection unit and carry out water sample chemical examination.
Step 3, laboratory data is analyzed
Then by among obtained result of laboratory test input water chemistry software AqQA.Create skin uncle's three lines shown in Fig. 1
Figure.According to the property of water sample, coal bed gas well well type, the technique used with reference to coal bed gas well aerogenesis situation, we are by trilinear chart
In diamond-shaped portion be divided into five regions.Two water samples in the A1 of region are mineral waters；Three water samples in the A2 of region are
Surface water；Region B is 7 mouthfuls of high yield water but the output water water sample of not gas-producing well；Region C1 is the product after 8 mouthfuls of fractured wells produce a year
Water outlet；Region C2 is the output water water sample of 52 mouthfuls of stable high yield wells.
From the point of view of the situation in this five areas, surface water and mineral water have low Na++K+High Ca2++Mg2+Feature, and coal seam
Water then has contrary characteristic.Therefore can be determined that, the water sample in the B area in the middle of surface water and coal seam water should be surface water
Mixing with coal seam water.Well aquifer yield in this area is typically all very high, it is inferred that diluting coal because surface water invades
Layer water, so Na++K+Content decrease.Simultaneously because the proportion that in mixing water, surface water accounts for is larger, this be just understood that for
What Ca2++Mg2+The reason ion increases relative to coal seam water.
Summary situation, in conjunction with the impact to gas production, we can repartition into the rhombus part of Fig. 1 as figure
Three areas of (Fructus Kaki village South 67 mouthfuls of coal bed gas well output waters of block and earth's surface drinking water water sample analysis figure) shown in 2, A area is drinkable
Aqua region, the most of drinking water related with our daily life is all in this region.B area coal seam water is invaded by surface water.C
Area is mainly coal seam water although the reason some wells are because of pressure break causes chloride ion content to increase, but after mining, will not
Affect the aerogenesis of this well.At present, in this area, the average daily output tolerance of 60 mouthfuls of wells has been over 3,700 sides/sky.
Carefully consult the well history of seven mouthfuls of wells in B area, it is seen that all these well all has different degrees of and surface water
UNICOM ground may.They have plenty of, and cementing quality is problematic, and upper formation water has immersed coal seam；Have plenty of sleeve pipe quality not conforming to
Lattice, upper formation water directly enters pit shaft from telescopic joint gap；Have plenty of because Geological Reasons, particularly the depositing of tomography
Upper formation water is made to directly invade coal seam；Also have the reason being because pressure break, cause ganging up of surface water and coal seam.
In order to further illustrate the present invention, below we pass through examples comparative once fractured well and horizontally-butted wells in construction
During the stratum water immersion that is likely to result in.We have selected each 12 mouthfuls of wells of two kinds of well type respectively, by their water sample chemical examination knot
Fruit is put in the trilinear chart of Fig. 3 and Fig. 4.As long as can see that either well position suitable is selected in pressure break or level docking, construction
Quality has no problem, and most of well is all without the invasion causing stratum water.But, every kind of construction has exception.This 24
In mouth well, pressure break and level docking have a well to fall in B area.
We are analyzed by real data and figure separately below, and to be what reason causes this two mouthfuls of wells shallow
The situation of layer water immersion.This two mouthfuls of wells are all placed in the bottom of legend in figs. 3 and 4.For the ease of contrast by this two mouthfuls
Well is placed individually into the trilinear chart shown in Fig. 5, and (before and after GSS-042 well pressure break, output water Dui Bitu ＆GSS-030V horizontally-butted wells produce
Water outlet figure), and increased the chemical analysis data of fractured well output water before pressure break.
GSS-042 well is carried out output water contrast before and after pressure break, as can see from Figure 5 before and after pressure break same well product
Go out water constituent and there occurs great changes, (at h1 in Fig. 6, represent before and after pressure break that aquifer yield there occurs very big from its product water curve
Change) it is also seen that after pressure break aquifer yield substantially increase.Accordingly it is concluded that this well is likely to during pressure break
Cause the destruction of pit shaft, because the cementing quality of this well is fine, eliminate the possibility that cement sheath is worn by pressure, thus it is speculated that should
This is to cause the hanging section of upper sleeve in fracturing process to be worn by pressure, and surface water is hence into pit shaft.Due to this well aquifer yield
It is not very big, the level of breakage of sleeve pipe should not seriously, as long as adhering to that mining still can be with aerogenesis.
Fig. 7 is the profile of horizontally-butted wells in the second application examples, from the figure, it can be seen that this branch has passed through two greatly
Tomography, up to 200 meters of coal seam drop h2, and more than 200 meter of fault throw is so that shallow layer surface water is easy to be imported into production
Well.Because surface water and other stratum water can enter pit shaft by tomography, so the aquifer yield of this well is very big (Fig. 8), put down
All water yield per day up to 40 is multi-party.So big aquifer yield discharge was adopted work and is brought huge pressure, through the row of nearly 2 years
Adopt, liquid level is still above more than 200 meter of more than coal seam.The mining input of this well is inherently wasted, and the mining to it
Also help will not be brought to other wells.
And due to there is no the method for the present invention at that time it is impossible to concrete condition is learnt in timely analysis, result in these wells
Discarded, waste substantial amounts of resource.
And after adopting method of the present invention analysis, can correspondingly select the operation of next step according to analysis result, tool
Body：
When output water source is defined as A area through said method, represent that this well should be just completion or just used clear
Water has carried out well-flushing, according to aquifer yield situation, continues mining for a period of time, can reuse same method and continue to determine output
The source of water.
When output water source is defined as B area through said method, represent that this well is immersed by stratum water, using correlation
Method is found out EXIT POINT and is carried out water-blocking operation；Meanwhile, water-yielding stratum is found out according to drilling well and log data, the block for future is opened
Send out and foundation is provided.
When output water source is defined as C area through said method, no matter the current aquifer yield of this mouthful of well is how many, continue mining,
There is no concern that other water layers invade problem.
Whereby, according to the difference in output water source, formulate corresponding discharge and mining method and related water blockoff measure, can be coal
The mining of layer gas provides help.In addition, understanding through above-mentioned analysis, when selecting horizontally-butted wells well spacing, before must carrying out
The geological analysis work of phase, avoids big tomography as far as possible.
In sum, the method that in the determination coal bed gas extraction of the present invention, output water is originated, it can be by coal bed gas
Well does water sampling and analysis after reaching mining stable phase, help judge the source of water, thus formulate suitable discharge and mining method with
Related water blockoff measure.More information with regard to stratum and casing programme can also be obtained, be exploration and the exploitation of coal bed gas well
Help is provided.For example, it is possible to provide with reference to so that can be effectively shielded from tomography in well spacing for well spacing, minimizing mining works
Pressure, also can reduce the quantity getting out disused well.Furthermore it is also possible to predict the gas production of coal bed gas well according to this result.
Claims (10)
1. a kind of determine coal bed gas extraction in output water source method it is characterised in that its by being checked or analyzed in water under
A whole or source to judge output water for several contents in row composition：Na+、K+、Ca2+、Mg2+、SO4 2-、Cl-、HCO3 -、
CO3 2-, it comprises the steps：
S1, Criterion model；
Corresponding composition or the content becoming packet in S2, detection water；
S3 is compared with master pattern, determines that output water is originated.
2. the method determining output water source in coal bed gas extraction as claimed in claim 1 is it is characterised in that it passes through detection
Or arbitrary group in following ingredients in analysis water or appoint several groups of the content source to judge output water：
Become packet one, Na++K+；
Become packet two, Ca2++Mg2+.
Become packet three, SO4 2-+Cl-；
Become packet four, HCO3 -+CO3 2-.
3. as claimed in claim 2 determine coal bed gas extraction in output water source method it is characterised in that：
Step S1 includes：
S11, the drafting primary trilinear chart of skin, wherein, component one and component two are the relative edge of diamond-shaped pattern, and component three and component four are Pedicellus et Pericarpium Trapae
Another group of relative edge of shape figure, the maximum of component one and component three is the first summit of diamond-shaped pattern, component two and component four
Maximum is the second summit of diamond-shaped pattern, and the first summit is relative with the second summit；
S12, from mineral water, surface water, the high yield water not water of gas-producing well output, the output water after fractured well mining intended duration
Stablize five kinds of water of the output water after aerogenesis as master sample with high-yield well, diamond-shaped pattern is set up subregion；
Step S3 includes：
S31, determine testing result falls into which subregion of diamond-shaped pattern；
S32, determine the source of output water according to the subregion that testing result is fallen into.
4. the method determining output water source in coal bed gas extraction as claimed in claim 3 is it is characterised in that in step S12
Partitioned mode include：
Choose mineral water as master sample, obtain into packet one (weight portion) 0%～17%, become packet two (weight portion) 83%
～100%, packet three (weight portion) 0%～12%, the region of one-tenth packet four (weight portion) 88%～100% are become, as A1 area,
Choose surface water as master sample, obtain into packet one (weight portion) 17%～42%, become packet two (weight portion) 58%～
83%th, packet three (weight portion) 0%～15%, the region of one-tenth packet four (weight portion) 85%～100% are become, as A2 area.
5. as claimed in claim 4 determine coal bed gas extraction in output water source method it is characterised in that：
On the basis of A1 area, A2 area, in conjunction with the impact to gas production, extension obtain into packet one (weight portion) 0%～42%,
Become the region of packet two (weight portion) 57%～100%, as A area, represent drinkable water region.
6. the method determining output water source in coal bed gas extraction as claimed in claim 3 is it is characterised in that in step S12
Partitioned mode include：
The water choosing high yield water not gas-producing well output, as master sample, obtains into packet one (weight portion) 42%～76%, becomes
Packet two (weight portions) 27%～57%, become packet three (weight portion) 0%～57%, become packet four (weight portion) 43%～
100% region, as B0Area.
7. as claimed in claim 6 determine coal bed gas extraction in output water source method it is characterised in that：
In B0On the basis of area, in conjunction with the impact to gas production, extension obtains into packet one (weight portion) 42%～76%, composition
The region of group two (weight portions) 27%～57%, as B area, indicates the coal seam aqua region that surface water invades.
8. the method determining output water source in coal bed gas extraction as claimed in claim 3 is it is characterised in that in step S12
Partitioned mode include：
Choose output water after a year for the fractured well mining as master sample, obtain into packet one (weight portion) 80%～100%,
Become packet two (weight portion) 0%～20%, become packet three (weight portion) 31%～82%, become packet four (weight portion) 18%～
69% region, as C1 area, chooses the output water after aerogenesis stablized by high-yield well as master sample, obtains into packet one (weight
Amount part) 76%～100%, become packet two (weight portion) 0%～24%, become packet three (weight portion) 0%～31%, become packet four
The region of (weight portion) 69%～100%, as C2 area.
9. as claimed in claim 8 determine coal bed gas extraction in output water source method it is characterised in that：
On the basis of C1 area, C2 area, in conjunction with the impact to gas production, extension obtain into packet one (weight portion) 76%～
100%th, become the region of packet two (weight portion) 0%～27%, as C area, represent coal seam aqua region.
10. a kind of discharge and mining method of coal bed gas well is it is characterised in that it comprises the steps：
One：According to any one method in claim 1 to 9, determine output water source be following in which：Expression can be drunk
The A area in Water District domain, the C area indicating the surface water B area of coal seam aqua region invading, representing coal seam aqua region；
Two：According to the determination result in output water source, execution step three, step 4 or step 5；
Three：When output water is originated as A area, represent that this well is just completion or just carried out well-flushing with clear water, according to product
Water yield situation, continue mining for a period of time after, repeated execution of steps one and step 2；
Four：When output water is originated as B area, represent that this well is immersed by stratum water, find out EXIT POINT and carry out water-blocking operation；
Five：When output water is originated as C area, no matter the current aquifer yield of this mouthful of well is how many, continue mining it is not necessary to worry other water layers
Intrusion problem.
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