CN109252847A - The method and device of water and cryogen alternating fracturing control coal seam fracture extension - Google Patents
The method and device of water and cryogen alternating fracturing control coal seam fracture extension Download PDFInfo
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- CN109252847A CN109252847A CN201811364185.9A CN201811364185A CN109252847A CN 109252847 A CN109252847 A CN 109252847A CN 201811364185 A CN201811364185 A CN 201811364185A CN 109252847 A CN109252847 A CN 109252847A
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- 239000003245 coal Substances 0.000 title claims abstract description 195
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 114
- 238000000034 method Methods 0.000 title claims abstract description 33
- 239000002245 particle Substances 0.000 claims abstract description 10
- 239000006185 dispersion Substances 0.000 claims abstract description 8
- 230000008014 freezing Effects 0.000 claims abstract description 7
- 238000007710 freezing Methods 0.000 claims abstract description 7
- 239000007789 gas Substances 0.000 claims description 75
- 238000002347 injection Methods 0.000 claims description 18
- 239000007924 injection Substances 0.000 claims description 18
- 230000015654 memory Effects 0.000 claims description 15
- 239000012530 fluid Substances 0.000 claims description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
- 239000000243 solution Substances 0.000 claims description 8
- 238000004590 computer program Methods 0.000 claims description 6
- 239000000155 melt Substances 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 5
- 238000006073 displacement reaction Methods 0.000 claims description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 6
- 230000011218 segmentation Effects 0.000 abstract description 4
- 239000004615 ingredient Substances 0.000 description 10
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical group C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 6
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
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- 230000005012 migration Effects 0.000 description 2
- 230000037361 pathway Effects 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000000274 adsorptive effect Effects 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- IDGUHHHQCWSQLU-UHFFFAOYSA-N ethanol;hydrate Chemical compound O.CCO IDGUHHHQCWSQLU-UHFFFAOYSA-N 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 229910021389 graphene Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
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- 239000003208 petroleum Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000013517 stratification Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000031068 symbiosis, encompassing mutualism through parasitism Effects 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
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Classifications
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- 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
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
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- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
This application provides the method and devices of a kind of water and cryogen alternating fracturing control coal seam fracture extension, and this method comprises the following steps: filling the water into coal bed gas well, to form the man-made fracture extended along natural fissure to the first setting regions hydraulic fracturing.Then cryogen is injected into coal bed gas well, makes the water freezing in coal seam, the coal petrography particle of dispersion is freezed together, and then the first setting regions generates an artificial major fracture along the maximum main stress direction extension in stratum.It then continues to fill the water into coal bed gas well, with to the second setting regions hydraulic fracturing, then injects cryogen into coal bed gas well, extend artificial major fracture forward, pass through the second setting regions.It repeats the above steps, is filled the water and injected cryogen pressure break respectively to the n-th setting regions, artificial main through crack is made to cross the n-th setting regions.Replace pressure break by water and cryogen to realize that reservoir reconstruction effect can be improved to control man-made fracture trend in segmentation frost coal seam.
Description
Technical field
The application belongs to petroleum works fracturing technique field, in particular to a kind of water and cryogen replace fracturing control coal
The method and device of layer crack extension.
Background technique
For coal bed gas as the gas resource with coal association, symbiosis, main component is methane.In the recovery process of coal
In, coal bed gas is the main harmful source for causing underground coal mine that gas explosion and coal and gas prominent disaster accident occurs.Coal bed gas
As a kind of clean energy resource, rational exploitation and utilization can not only improve the condition of Safety of Coal Mine Production, can also play protection ring
The effect in border, while also there is strategic importance to the adjustment of national energy structure.China's coal bed gas resource is relatively abundanter, reserves position
It ranks the third of the world, development and utilization coal bed gas has important realistic price.But compared with conventional oil gas reservoir reservoir rock, coal petrography
Permeability is lower, and most of coalbed methane reservoir has the characteristics that low saturation, hyposmosis and low-pressure, arranges without effectively volume increase
It applies, the typically no economic productivity of coal bed gas well.Flowing of the coal bed gas in reservoir mainly passes through coal body itself fissure system, therefore
How to be effectively connected to pit shaft and coal seam natural fissure system becomes the key factor of coal-bed-gas production-increase.
In recent years, by independent research and technology transfer, China's Coalbed Methane Productivity has obtained rapid growth.Coal bed gas at present
The main body yield-increasing technology of exploitation first is that hydraulic fracturing.Since coal petrography has, soft, deformation is big and natural fissure is extremely developed
Feature, hydraulic fracture are easy to be extended along coal seam natural fissure, and the hydraulic fracture of formation is concentrated mainly near wellbore,
It is difficult to carry out pressure break to the coal seam of distant place, reservoir reconstruction range is small, and fracturing effect is poor, and to this, there has been no effective solutions to do at present
Method.
Summary of the invention
In order to overcome the drawbacks described above of the prior art, technical problem to be solved by the invention is to provide a kind of water and low temperature
Fluid replaces the method and device of fracturing control coal seam fracture extension, can replace pressure break by water and cryogen to realize
Segmentation frost coal seam, to control the trend of man-made fracture.
The specific technical solution of the present invention is:
The present invention provides the method for a kind of water and cryogen alternating fracturing control coal seam fracture extension, including walks as follows
It is rapid:
Coal bed gas well is obtained, the coal seam around the coal bed gas well has natural fissure；
It is filled the water into the coal bed gas well, to be formed manually to the first setting regions hydraulic fracturing around the coal bed gas well
Crack, the man-made fracture are extended along the natural fissure；
After first setting regions completes hydraulic fracturing, cryogen is injected into the coal bed gas well, makes coal seam
In water freezing, and then the coal petrography particle of dispersion is freezed together；
Continue to inject cryogen into the coal bed gas well, first setting regions is made to generate one along stratum maximum
The artificial major fracture of main stress direction extension；
After first setting regions completes cryogen pressure break, continue to fill the water into the coal bed gas well, to institute
The the second setting regions hydraulic fracturing for stating the first setting regions periphery, after second setting regions completes hydraulic fracturing, to
Cryogen is injected in the coal bed gas well, extends the artificial major fracture forward, and passes through the second setting regions；
It repeats the above steps, is filled the water and injected cryogen pressure break respectively to the n-th setting regions, make the artificial master
Crack continues to extend forward, and passes through the n-th setting regions, and wherein n is the positive integer more than or equal to 3.
In one preferred embodiment, first setting regions, second setting regions and described n-th
The range of setting regions is divided according to the saturation water absorbing capacity and water injection rate in the coal seam.
In one preferred embodiment, the n-th setting regions ring is located at the periphery of the (n-1)th setting regions.
In one preferred embodiment, it after completing water and cryogen alternating pressure break to the n-th setting regions, stands
Three days, so that the ice in coal seam melts completely.
In one preferred embodiment, it after the ice in coal seam melts completely, is implanted sequentially and takes into the coal seam
Sand liquid and displacement fluid complete pressure break so that filling proppant in artificial major fracture.
In one preferred embodiment, the cryogen is alcohol solution and/or liquid nitrogen.
In one preferred embodiment, the temperature of the cryogen is -196 DEG C to -30 DEG C.
In one preferred embodiment, the temperature of the water is 0 DEG C.
In addition, replacing fracturing control coal seam using water described in any of the above embodiments and cryogen the present invention also provides a kind of
The water of the method for crack extension and the device of cryogen alternating fracturing control coal seam fracture extension, comprising:
Module is obtained, is configured as obtaining coal bed gas well, the coal seam around the coal bed gas well has natural fissure；
Water injection module is configured as filling the water into the coal bed gas well, to the first setting area around the coal bed gas well
Domain hydraulic fracturing forms man-made fracture, and the man-made fracture is extended along the natural fissure；
First beam module is configured as after first setting regions completes hydraulic fracturing, to the coal bed gas
Cryogen is injected in well, makes the water freezing in coal seam, and then the coal petrography particle of dispersion is freezed together；
Second beam module is configured as continuing to inject cryogen into the coal bed gas well, makes described first to set
Determine region and generates an artificial major fracture along the maximum main stress direction extension in stratum；
Injection module is configured as after first setting regions completes cryogen pressure break, continues to the coal seam
Water filling in gas well, with the second setting regions hydraulic fracturing to the first setting regions periphery, in second setting regions
After completing hydraulic fracturing, cryogen is injected into the coal bed gas well, extends the artificial major fracture forward, and passes through the
Two setting regions；
Replicated blocks are configured as repeating the above steps, and are filled the water and injected cryogen respectively to the n-th setting regions
Pressure break extends the artificial major fracture continuation forward, and passes through the n-th setting regions, and wherein n is the positive integer more than or equal to 3.
In addition, the present invention also provides the devices of a kind of water and cryogen alternating fracturing control coal seam fracture extension, including
Memory and processor store computer program in memory, and the computer program is realized when being executed by the processor
Following steps: the method for water as described in any one of the above embodiments and cryogen alternating fracturing control coal seam fracture extension.
By above technical solution, the beneficial effects of the present application are as follows:
The method and device of water provided by the invention and cryogen alternating fracturing control coal seam fracture extension, with existing skill
Art is compared, and replaces pressure break by water and cryogen to realize segmentation frost coal seam, so that man-made fracture trend is controlled, so that people
More natural fissures in coal seam are linked up in work crack, improve reservoir reconstruction effect, increase coal bed gas migration pathway, improve coal bed gas
Recovery ratio.
Referring to following description and accompanying drawings, specific implementations of the present application are disclosed in detail, specify the original of the application
Reason can be in a manner of adopted.It should be understood that presently filed embodiment is not so limited in range.In appended power
In the range of the spirit and terms that benefit requires, presently filed embodiment includes many changes, modifications and is equal.
The feature for describing and/or showing for a kind of embodiment can be in a manner of same or similar one or more
It uses in a other embodiment, is combined with the feature in other embodiment, or the feature in substitution other embodiment.
It should be emphasized that term "comprises/comprising" refers to the presence of feature, one integral piece, step or component when using herein, but simultaneously
It is not excluded for the presence or additional of one or more other features, one integral piece, step or component.
Detailed description of the invention
Attached drawing described here is only used for task of explanation, and is not intended to limit model disclosed in the present application in any way
It encloses.In addition, shape and proportional sizes of each component in figure etc. are only schematical, it is used to help the understanding to the application, and
It is not the specific shape and proportional sizes for limiting each component of the application.Those skilled in the art, can under teachings of the present application
Implement the application to select various possible shapes and proportional sizes as the case may be.In the accompanying drawings:
Fig. 1 is the water of the application embodiment and cryogen replaces the method flow that fracturing control coal seam fracture extends
Figure；
Fig. 2 is the first setting fracture zone hydraulic fracturing man-made fracture schematic diagram of the application embodiment；
Fig. 3 is that the water of the application embodiment and cryogen replace fracturing artificial slit and extend schematic diagram；
Fig. 4 is finally obtained crack schematic diagram of communicating with each other after the completion of the pressure break of the application embodiment；
Fig. 5 is the water of the application embodiment and cryogen replaces the apparatus module that fracturing control coal seam fracture extends
Figure.
The appended drawing reference of the figures above: 1, region is transformed in the first hydraulic fracturing；2, coal bed gas well；3, man-made fracture；4, day
Right crack；5, artificial major fracture；6, the first setting regions；7, the second setting regions；8, the n-th setting regions；9；Communication is manually split
The natural fissure of seam；10, proppant；101, module is obtained；102, water injection module；103, the first beam module；104, second
Beam module；105, injection module；106, replicated blocks.
Specific embodiment
Below in conjunction with the attached drawing in the application embodiment, the technical solution in the application embodiment is carried out clear
Chu is fully described by, it is clear that described embodiment is only a part of embodiment of the application, rather than whole realities
Apply mode.Based on the embodiment in the application, those of ordinary skill in the art institute without creative efforts
The every other embodiment obtained, shall fall in the protection scope of this application.
It should be noted that it can directly on the other element when element is referred to as " being set to " another element
Or there may also be elements placed in the middle.When an element is considered as " connection " another element, it, which can be, is directly connected to
To another element or it may be simultaneously present centering elements.Term as used herein " vertical ", " horizontal ", " left side ",
" right side " and similar statement for illustrative purposes only, are not meant to be the only embodiment.
Unless otherwise defined, all technical and scientific terms used herein and the technical field for belonging to the application
The normally understood meaning of technical staff is identical.The term used in the description of the present application is intended merely to description tool herein
The purpose of the embodiment of body, it is not intended that in limitation the application.Term as used herein "and/or" includes one or more
Any and all combinations of relevant listed item.
As shown in Figure 1, the present invention provides the method for a kind of water and cryogen alternating fracturing control coal seam fracture extension, it should
Method includes the following steps:
S1: obtaining coal bed gas well 2, and the coal seam around the coal bed gas well 2 has natural fissure 4.
S2: filling the water into the coal bed gas well 2, to 6 hydraulic fracturing shape of the first setting regions around the coal bed gas well 2
At man-made fracture 3, the man-made fracture 3 is extended along the natural fissure 4.
S3: after first setting regions 6 completes hydraulic fracturing, cryogen is injected into the coal bed gas well 2, is made
Water freezing in coal seam, and then the coal petrography particle of dispersion is freezed together.
S4: continuing to inject cryogen into the coal bed gas well 2, and first setting regions 6 is made to generate one along ground
The artificial major fracture 5 of the maximum main stress direction extension of layer.
S5: after first setting regions 6 completes cryogen pressure break, continuing to fill the water into the coal bed gas well 2, with
To 7 hydraulic fracturing of the second setting regions of 6 periphery of the first setting regions, water filling pressure is completed in second setting regions 7
After splitting, cryogen is injected into the coal bed gas well 2, extends the artificial major fracture 5 forward, and passes through the second setting area
Domain 7.
S6: repeating the above steps, and is filled the water and is injected cryogen pressure break respectively to the n-th setting regions 8, make the people
The continuation of work major fracture 5 extends forward, and passes through the n-th setting regions 8, and wherein n is the positive integer more than or equal to 3.
In the present embodiment, attached drawing 2 is referred to, the coal bed gas well 2 for needing to be transformed is obtained first, to the coal bed gas well 2
Interior hydraulic fracturing forms the first hydraulic fracturing and region 1 is transformed.In turn, water can inject coal seam by coal bed gas well 2, fill coal seam
Divide water suction, and then pressure break is carried out to the first setting regions 6 around coal bed gas well 2, forms man-made fracture.In general,
Since many natural fissures 4 such as stratification, hugger are contained in coal seam, into coal seam, water filling carries out the man-made fracture 3 that pressure break obtains
It is extended mainly along natural fissure 4.Preferably, the temperature of the water can be 0 DEG C.On the one hand, it can reduce and not freeze
The temperature in area coal seam is freezed convenient for being subsequently implanted into cryogen.On the other hand, pass through in water artificial in frost subterranean zone
When major fracture 5, avoid being higher than 0 DEG C of thawing for leading to artificial 5 two sides ice body of major fracture because of coolant-temperature gage, to avoid artificial major fracture
Branch fractures, which occur, in 5 two sides causes water flow to be lost.
After water injection rate reaches requirement, the first setting regions 6 completes hydraulic fracturing.It should be noted that due to not
With coal seam coal petrography saturated water adsorptive value difference, therefore water injection rate is also different, and specific water injection rate is needed according to actual production
It needs to be configured, the application is not intended to be limited in any this.
Then, attached drawing 3 is referred to, injects cryogen into the coal bed gas well 2.The cryogen can choose alcohols
Aqueous solution and/or liquid nitrogen etc., for example, methanol aqueous solution and/or ethanol water.In general, the temperature of the cryogen
The degree upper limit needs to be set according to capacity of heat transmission size after coal petrography water suction in coal seam, needs to guarantee that cryogen can be in due course
The interior coal petrography fully charge that surrounding can be absorbed water.The lower limit of cryogen temperature should be according to the low temperature pole that fracturing unit is able to bear
Limit is to determine.Preferably, the temperature of the cryogen can be -196 DEG C to -30 DEG C.Cryogen temperature can not be excessively high,
It avoids causing cryogen that cannot effectively freeze hydraulic fracturing rapidly during injecting stratum because cryogen temperature is excessively high
The coal seam in region.
After injecting cryogen in coal seam, the water in coal seam freezes because of cold service, thus by the coal petrography particle of dispersion
It freezes together, interference of the coal seam natural fissure 4 to man-made fracture 3 can be substantially eliminated.Continue to infuse into the coal bed gas well 2
Enter cryogen, first setting regions 6 is made to generate an artificial major fracture along the maximum main stress direction extension in stratum
5, that is, complete the cryogen pressure break of the first setting regions 6.
Rule of judgment for the first setting regions 6 completion cryogen pressure break is that the pressure of injection cryogen is big suddenly
Width decline.This is because injecting cryogen into fracturing string, the coal petrography around pit shaft can freeze because of cold service, by coal
Rock particle freezes together, and the extension of man-made fracture 3 at this time is extended mainly along the maximum main stress direction in stratum.Manually leading
During crack 5 extends, since the head temperature of artificial major fracture 5 is very low, surrounding water suction coal petrography can equally freeze
Knot, artificial major fracture 5 extends further along later.When artificial major fracture 5 reaches the boundary of the first setting regions 6, due to
Coal petrography is relatively dry, and the coal petrography particle of artificial 5 front end of major fracture will not be freezed, and cryogen can be rapidly along waterpower at this time
Coal petrography natural fissure except fracturing reform region is extended, so that the cryogenic fluid pressure of injection can occur suddenly significantly
Decline.Thus, it is possible to be declined to a great extent suddenly by this pressure to judge that the first setting regions 6 completes cryogen pressure break.
After completing cryogen pressure break to the first setting regions 6, continue further in accordance with above-mentioned steps to the coal bed gas well
Interior water filling, with 7 hydraulic fracturing of the second setting regions to 6 periphery of the first setting regions.At this point, being carried out using water to coal seam
During pressure break, since the resistance that water is flowed along artificial major fracture 5 in frost subterranean zone is minimum, water can preferentially lead to
The end that this crack reaches crack is crossed, to realize the hydraulic fracturing to the second setting regions 7.In second setting regions 7
After completing hydraulic fracturing, still continues to inject cryogen into the coal bed gas well using above-mentioned steps, make the artificial master
Crack 5 extends forward, and passes through the second setting regions 7, completes 7 cryogen pressure break of the second setting regions.Similarly, using low
During warm fluid carries out pressure break to coal seam, flowed due to cryogen along artificial major fracture 5 in frost subterranean zone
Resistance is minimum, therefore cryogen can preferentially reach the end in crack by this crack, to realize to the second setting regions 7
Cryogen pressure break.
Assuming that there is n setting regions in coal seam, then to repeat the above steps, to the n-th setting regions 8 respectively carry out water filling and
Inject cryogen pressure break, extend the artificial major fracture 5 continuation forward, and pass through the n-th setting regions 8, wherein n be greater than
Positive integer equal to 3.In general, n-th setting regions 8 can be located at the periphery of the (n-1)th setting regions with ring.This
When, artificial major fracture 5 can be connected to surrounding natural fissure 4 (linking up the natural fissure 9 of man-made fracture).
After completing water and cryogen alternating pressure break to the n-th setting regions 8, need to stand three days, so that in coal seam
Ice melts completely.Then, attached drawing 4 is referred to, is implanted sequentially load fluid and displacement fluid into the coal seam, so that artificial major fracture
Proppant 10 is filled in 5, that is, completes the final pressure break to coal seam.
It should be noted that the range of the first setting regions 6, the second setting regions 7 and the n-th setting regions 8 can root
It is divided according to the saturation water absorbing capacity and water injection rate in the coal seam.And the saturation water absorbing capacity and water injection rate of different coal are not
Together, therefore, the application will divide the range of each region according to the case where practical coal seam, and specific range is not done herein
Any restriction.
Water of the invention and the method for cryogen alternating fracturing control coal seam fracture extension are handed over using water and cryogen
Pressure break is carried out for coal seam, can be segmented and realize that the subterranean zone to separate coal bed gas well freezes, to control distant place coal
The trend of man-made fracture 5 in layer links up more natural fissures 4 in coal seam so that the continuation of man-made fracture 5 extends forward.
Based on the same inventive concept, a kind of water and cryogen alternating fracturing control coal are additionally provided in the embodiment of the present invention
The device of layer crack extension, as described in the following examples.Since a kind of water and cryogen replace fracturing control coal seam fracture
A kind of method that the principle that the device of extension solves the problems, such as replaces the extension of fracturing control coal seam fracture with water and cryogen is similar,
Therefore the implementation of water and the device of cryogen alternating fracturing control coal seam fracture extension may refer to water and cryogen alternating
The implementation of the method for fracturing control coal seam fracture extension, overlaps will not be repeated.It is used below, term " unit " or
The combination of the software and/or hardware of predetermined function may be implemented in " module ".Although device is preferably described in following embodiment
It is realized with software, but the realization of the combination of hardware or software and hardware is also that may and be contemplated.
As shown in figure 5, a kind of expanded using water described in any of the above embodiments and cryogen alternating fracturing control coal seam fracture
The device of water and cryogen the alternating fracturing control coal seam fracture extension of the method for exhibition, comprising:
Module 101 is obtained, is configured as obtaining coal bed gas well 2, the coal seam around the coal bed gas well 2 has natural fissure
4；
Water injection module 102 is configured as filling the water into the coal bed gas well 2, to set to around the coal bed gas well 2 first
Determine 6 hydraulic fracturing of region and form man-made fracture 3, the man-made fracture 3 is extended along the natural fissure 4；
First beam module 103 is configured as after first setting regions 6 completes hydraulic fracturing, to the coal
Cryogen is injected in layer gas well 2, makes the water freezing in coal seam, and then the coal petrography particle of dispersion is freezed together；
Second beam module 104 is configured as continuing to inject cryogen into the coal bed gas well 2, makes described the
One setting regions 6 generates an artificial major fracture 5 along the maximum main stress direction extension in stratum；
Injection module 105 is configured as after first setting regions 6 completes cryogen pressure break, continues to described
Water filling in coal bed gas well 2 is set with 7 hydraulic fracturing of the second setting regions to 6 periphery of the first setting regions described second
After determining the completion of region 7 hydraulic fracturing, cryogen is injected into the coal bed gas well 2, prolongs the artificial major fracture 5 forward
It stretches, and passes through the second setting regions 7；
Replicated blocks 106 are configured as repeating the above steps, and are filled the water and injected low temperature respectively to the n-th setting regions 8
Fluid fracturing extends the continuation of artificial major fracture 5 forward, and passes through the n-th setting regions 8, and wherein n is more than or equal to 3
Positive integer.
In a preferred embodiment, first setting regions 6, second setting regions 7 and described n-th set
The range for determining region 8 can be divided according to the saturation water absorbing capacity and water injection rate in the coal seam.
In a preferred embodiment, 8 ring of the n-th setting regions is located at the periphery of the (n-1)th setting regions.
In addition, water and the device of cryogen alternating fracturing control coal seam fracture extension further include standing module (in figure not
Show), it is configured as after completing water and cryogen alternating pressure break to the n-th setting regions 8, three days is stood, so that coal seam
In ice melt completely.
In turn, water and cryogen alternating fracturing control coal seam fracture extension device further include pressure break module (in figure not
Show), it is configured as after the ice in coal seam melts completely, is implanted sequentially load fluid and displacement fluid into the coal seam, makes
It obtains and fills proppant 10 in artificial major fracture, complete pressure break.
In a preferred embodiment, the cryogen is alcohol solution and/or liquid nitrogen etc..
In a preferred embodiment, the temperature of the cryogen is -196 DEG C to -30 DEG C.
In a preferred embodiment, the temperature of the water is 0 DEG C.
In addition, the present invention also provides the devices of a kind of water and cryogen alternating fracturing control coal seam fracture extension, including
Memory and processor store computer program in memory, and the computer program is realized when being executed by the processor
Following steps: the method for water as described above and cryogen alternating fracturing control coal seam fracture extension.
In the present embodiment, the memory may include the physical unit for storing information, usually by information
It is stored again with the media using the methods of electricity, magnetic or optics after digitlization.Memory described in present embodiment again may be used
To include: to store the device of information, such as RAM, ROM in the way of electric energy；The device of information is stored in the way of magnetic energy, it is such as hard
Disk, floppy disk, tape, core memory, magnetic bubble memory, USB flash disk；Using the device of optical mode storage information, such as CD or DVD.
Certainly, there are also memories of other modes, such as quantum memory, graphene memory etc..
In the present embodiment, the processor can be implemented in any suitable manner.For example, the processor can be with
Take such as microprocessor or processor and storage can by (micro-) processor execute computer readable program code (such as
Software or firmware) computer-readable medium, logic gate, switch, specific integrated circuit (Application Specific
Integrated Circuit, ASIC), programmable logic controller (PLC) and the form etc. for being embedded in microcontroller.
The concrete function that the server that this specification embodiment provides, processor and memory are realized, can be with this
Aforementioned embodiments in specification contrast explanation.
In another embodiment, additionally provide a kind of software, the software for execute above-described embodiment and preferably
Technical solution described in embodiment.
In another embodiment, a kind of storage medium is additionally provided, above-mentioned software is stored in the storage medium,
The storage medium includes but is not limited to: CD, floppy disk, hard disk, scratch pad memory etc..
As can be seen from the above description, embodiment of the present invention realizes following technical effect: provided by the invention
Water and the method and device of cryogen alternating fracturing control coal seam fracture extension pass through water and low temperature compared with prior art
Fluid replaces pressure break to realize segmentation frost coal seam, so that man-made fracture trend is controlled, so that man-made fracture is linked up in coal seam more
More natural fissures improves reservoir reconstruction effect, increases coal bed gas migration pathway, improves coal bed gas recovery ratio.
Obviously, those skilled in the art should be understood that each module of the above-mentioned embodiment of the present invention or each step can be with
It is realized with general computing device, they can be concentrated on a single computing device, or be distributed in multiple computing devices
On composed network, optionally, they can be realized with the program code that computing device can perform, it is thus possible to by it
Store and be performed by computing device in the storage device, and in some cases, can be held with the sequence for being different from herein
The shown or described step of row, perhaps they are fabricated to each integrated circuit modules or will be multiple in them
Module or step are fabricated to single integrated circuit module to realize.In this way, the embodiment of the present invention be not limited to it is any specific hard
Part and software combine.
All articles and reference of present disclosure, including patent application and publication, pass through for various purposes
It quotes and is hereby incorporated by.Describing combined term " substantially by ... constitute " should include identified element, ingredient, component or step
And other elements, ingredient, component or step essentially without the basic novel feature for influencing the combination.Use term " packet
Containing " or " comprising " come describe element here, ingredient, component or step combination it is also contemplated that substantially by these elements, ingredient,
The embodiment that component or step are constituted.Here by using term " can with ", it is intended to illustrate that " can with " includes described
Any attribute is all optional.
Multiple element, ingredient, component or step can be provided by single integrated component, ingredient, component or step.Optionally
Ground, single integrated component, ingredient, component or step can be divided into multiple element, ingredient, component or the step of separation.It is used to
The open "a" or "an" for describing element, ingredient, component or step is not said to exclude other elements, ingredient, component
Or step.
It should be understood that above description is to illustrate rather than to be limited.By reading above-mentioned retouch
It states, many embodiments and many applications except provided example all will be aobvious and easy for a person skilled in the art
See.Therefore, the range of this introduction should not be determined referring to foregoing description, but should referring to preceding claims and this
The full scope of the equivalent that a little claims are possessed determines.For comprehensive purpose, all articles and with reference to including special
The disclosure of benefit application and bulletin is all by reference to being incorporated herein.Theme disclosed herein is omitted in preceding claims
Any aspect is not intended to abandon the body matter, also should not be considered as applicant the theme is not thought of as it is disclosed
Apply for a part of theme.
Claims (10)
1. a kind of method of water and cryogen alternating fracturing control coal seam fracture extension, which comprises the steps of:
Coal bed gas well is obtained, the coal seam around the coal bed gas well has natural fissure；
It fills the water into the coal bed gas well, is manually split with being formed to the first setting regions hydraulic fracturing around the coal bed gas well
Seam, the man-made fracture are extended along the natural fissure；
After first setting regions completes hydraulic fracturing, cryogen is injected into the coal bed gas well, is made in coal seam
Water freezing, and then the coal petrography particle of dispersion is freezed together；
Continue to inject cryogen into the coal bed gas well, keeps the first setting regions generation one maximum mainly along stratum
The artificial major fracture of stress direction extension；
After first setting regions completes cryogen pressure break, continue to fill the water into the coal bed gas well, to described the
Second setting regions hydraulic fracturing of one setting regions periphery, after second setting regions completes hydraulic fracturing, to described
Cryogen is injected in coal bed gas well, extends the artificial major fracture forward, and passes through the second setting regions；
It repeats the above steps, is filled the water and injected cryogen pressure break respectively to the n-th setting regions, make the artificial major fracture
Continuation extends forward, and passes through the n-th setting regions, and wherein n is the positive integer more than or equal to 3.
2. the method for water according to claim 1 and cryogen alternating fracturing control coal seam fracture extension, feature exist
In the range of first setting regions, second setting regions and n-th setting regions is according to the coal seam
Saturation water absorbing capacity and water injection rate are divided.
3. the method for water according to claim 1 and cryogen alternating fracturing control coal seam fracture extension, feature exist
In the n-th setting regions ring is located at the periphery of the (n-1)th setting regions.
4. the method for water according to claim 1 and cryogen alternating fracturing control coal seam fracture extension, feature exist
In, after completing water and cryogen alternating pressure break to the n-th setting regions, standing three days, so that the ice in coal seam melts completely.
5. the method for water according to claim 4 and cryogen alternating fracturing control coal seam fracture extension, feature exist
In after the ice in coal seam melts completely, load fluid and displacement fluid being implanted sequentially into the coal seam, so that in artificial major fracture
Proppant is filled, pressure break is completed.
6. the method for water according to claim 1 and cryogen alternating fracturing control coal seam fracture extension, feature exist
In the cryogen is alcohol solution and/or liquid nitrogen.
7. the method for water according to claim 1 and cryogen alternating fracturing control coal seam fracture extension, feature exist
In the temperature of the cryogen is -196 DEG C to -30 DEG C.
8. the method for water according to claim 1 and cryogen alternating fracturing control coal seam fracture extension, feature exist
In the temperature of the water is 0 DEG C.
9. a kind of replace the extension of fracturing control coal seam fracture using the described in any item water of the claims and cryogen
The device of water and cryogen the alternating fracturing control coal seam fracture extension of method characterized by comprising
Module is obtained, is configured as obtaining coal bed gas well, the coal seam around the coal bed gas well has natural fissure；
Water injection module is configured as filling the water into the coal bed gas well, to infuse to the first setting regions around the coal bed gas well
Hydraulic pressure splits to form man-made fracture, and the man-made fracture is extended along the natural fissure；
First beam module is configured as after first setting regions completes hydraulic fracturing, into the coal bed gas well
Cryogen is injected, makes the water freezing in coal seam, and then the coal petrography particle of dispersion is freezed together；
Second beam module is configured as continuing to inject cryogen into the coal bed gas well, makes first setting area
Domain generates an artificial major fracture along the maximum main stress direction extension in stratum；
Injection module is configured as after first setting regions completes cryogen pressure break, continues to the coal bed gas well
Interior water filling is completed with the second setting regions hydraulic fracturing to the first setting regions periphery in second setting regions
After hydraulic fracturing, cryogen is injected into the coal bed gas well, extends the artificial major fracture forward, and passes through second and sets
Determine region；
Replicated blocks are configured as repeating the above steps, and are filled the water and injected cryogen pressure respectively to the n-th setting regions
It splits, extends the artificial major fracture continuation forward, and pass through the n-th setting regions, wherein n is the positive integer more than or equal to 3.
10. the device of a kind of water and cryogen alternating fracturing control coal seam fracture extension, which is characterized in that including memory and
Processor stores computer program in memory, and the computer program realizes following step when being executed by the processor
It is rapid: the method for water as claimed in any one of claims 1 to 8 and cryogen alternating fracturing control coal seam fracture extension.
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| CN201811364185.9A CN109252847B (en) | 2018-11-16 | 2018-11-16 | Method and device for controlling coal seam crack expansion by alternately fracturing water and low-temperature fluid |
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| CN111222252A (en) * | 2020-01-20 | 2020-06-02 | 东北石油大学 | Method and system for predicting oil-water two-phase post-pressure productivity of low-saturation oil reservoir |
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| CN114575818A (en) * | 2022-03-31 | 2022-06-03 | 中国石油大学(北京) | Fracturing method based on gas-liquid driving pulse |
| CN118030005A (en) * | 2024-04-11 | 2024-05-14 | 四川泓腾能源集团有限公司 | Liquid nitrogen fracturing device and use method |
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| CN113586022A (en) * | 2021-06-04 | 2021-11-02 | 广州海洋地质调查局 | Method and device for increasing production and improving natural gas hydrate reservoir by freezing and fracturing |
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| CN114575818A (en) * | 2022-03-31 | 2022-06-03 | 中国石油大学(北京) | Fracturing method based on gas-liquid driving pulse |
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