CN110017125A - A kind of recovery method and system of shale gas - Google Patents
A kind of recovery method and system of shale gas Download PDFInfo
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- CN110017125A CN110017125A CN201910353071.2A CN201910353071A CN110017125A CN 110017125 A CN110017125 A CN 110017125A CN 201910353071 A CN201910353071 A CN 201910353071A CN 110017125 A CN110017125 A CN 110017125A
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000011084 recovery Methods 0.000 title claims abstract description 13
- 239000007789 gas Substances 0.000 claims abstract description 229
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims abstract description 45
- 238000002347 injection Methods 0.000 claims abstract description 29
- 239000007924 injection Substances 0.000 claims abstract description 29
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 21
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 21
- 239000001301 oxygen Substances 0.000 claims abstract description 21
- 238000000197 pyrolysis Methods 0.000 claims abstract description 14
- 239000011148 porous material Substances 0.000 claims abstract description 8
- 239000011159 matrix material Substances 0.000 claims abstract description 4
- 239000007787 solid Substances 0.000 claims abstract description 4
- 238000005065 mining Methods 0.000 claims description 16
- 238000009423 ventilation Methods 0.000 claims description 12
- 238000003795 desorption Methods 0.000 claims description 9
- 239000008246 gaseous mixture Substances 0.000 claims description 9
- 229930195733 hydrocarbon Natural products 0.000 claims description 9
- 150000002430 hydrocarbons Chemical class 0.000 claims description 9
- 239000004215 Carbon black (E152) Substances 0.000 claims description 7
- 238000001514 detection method Methods 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 39
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 abstract description 22
- 229910002092 carbon dioxide Inorganic materials 0.000 abstract description 11
- 239000001569 carbon dioxide Substances 0.000 abstract description 11
- 238000002485 combustion reaction Methods 0.000 abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 11
- 238000010438 heat treatment Methods 0.000 abstract description 6
- 239000000446 fuel Substances 0.000 abstract description 5
- 238000003912 environmental pollution Methods 0.000 abstract description 2
- 230000009878 intermolecular interaction Effects 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 10
- 238000005516 engineering process Methods 0.000 description 5
- 230000035699 permeability Effects 0.000 description 5
- 238000001179 sorption measurement Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000005553 drilling Methods 0.000 description 3
- -1 methane Chemical class 0.000 description 3
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000009738 saturating Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance 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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
- E21B43/241—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection combined with solution mining of non-hydrocarbon minerals, e.g. solvent pyrolysis of oil shale
-
- 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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
- E21B43/243—Combustion in situ
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/70—Combining sequestration of CO2 and exploitation of hydrocarbons by injecting CO2 or carbonated water in oil wells
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
A kind of recovery method and system of shale gas, this method is to be passed through pure oxygen into shale gas reservoir, and controlled burning is carried out with the free state shale gas preferentially diffused out in reservoir in horizontal well, the heat that burning generates can be transmitted to shale gas reservoir, it improves the free energy of shale gas and reduces intermolecular interaction force, make the desorbing gas such as the methane being adsorbed in shale matrix pores network, and solid kerogen pyrolysis is made to generate pyrolysis gas, to obtain shale gas；The system includes gas injection module, gas collection module and gas flow adjustment module.The configuration of the present invention is simple, it is easy to implement, the degree of burning can be controlled by the supply amount of oxygen, without additional fuel for heating, good economy performance, combustion product is mainly water and carbon dioxide, and environmental pollution is small.
Description
Technical field
The invention belongs to shale gas exploitation technical field more particularly to the recovery methods and system of a kind of shale gas.
Background technique
Shale gas refers to the Unconventional gas preserved in series of rocks based on preservation Yu Yifu organic shale, mainly to inhale
Attached state and free state exist, and are a kind of cleaning, the efficient energy.The main component of shale gas is the hydrocarbons such as methane, main
Crack, hole and other reservoir spaces are present in free state on body, kerogen, clay particle and hole are present in ADSORPTION STATE
Surface, minute quantity are stored in kerogen, asphalitine and petroleum with solubilised state.
The shale gas resource very abundant in China, technically recoverable resources are 36 tcms, are conventional gas
1.6 times, there is huge commercial value.However, shale gas reservoir has porosity low and seeps compared to traditional oil and gas reservoir
The low characteristic of saturating rate.Therefore, flow resistance of the shale gas in reservoir is big, and production efficiency is low and exploitation difficulty is big.The page of China
Rock gas reservoir buried depth is big, and generally 2000-3500 meters, simultaneously because its heterogeneity is extremely strong, these are all opened for shale gas
The maturation for adopting technology adds difficulty.Currently, water fracturing technique be using most extensively be also most successful shale gas exploitation technology,
But hydraulic fracturing technology is needed using the fracturing fluid for being largely mixed with chemical substance, on the one hand can be to groundwater resources and soil ring
Border damages, and on the other hand can also consume a large amount of water resource.So hydraulic fracturing technology is not suitable for Xinjiang of China and river
The water-deficient areas such as south.Currently, have through the method for explosion and improve shale gas gas production rate, but the safety of the method still needs
Textual criticism.It is exploited in addition, also having through microwave heating shale gas reservoir, but its energy utilization rate is low, higher cost opens
Adopt inefficiency.
Therefore, it is necessary to a kind of safer, more economical, more efficient shale gas exploitation method and system be provided, to adapt to
The demand in market.
Summary of the invention
In view of this, being burnt the purpose of the present invention is to provide a kind of recovery method of shale gas and system by part
The imflammable gas such as the methane in shale gas reservoir, without providing additional fuel from external, promote adsorbed gas desorption and
Kerogenic pyrolysis improves the permeability of shale gas reservoir, to improve the production efficiency and yield of shale gas.
To achieve the above object, the invention provides the following technical scheme:
A kind of recovery method of shale gas comprising step:
Obtain shale gas reservoir；
The burning well in shale gas reservoir is chosen, pure oxygen is injected into the burning well, makes to diffuse out in pure oxygen and reservoir
Hydrocarbon mixing, form flammable gaseous mixture；
Flammable gaseous mixture a little fight to generate heat；
The heat generated to shale reservoir transmitting, makes the desorbing gas being adsorbed in shale matrix pores network, and
Solid kerogen pyrolysis is set to generate pyrolysis gas, to obtain shale gas.
Further, it is further comprised the steps of: before the igniting
Set ideal oxygen values, detect the pure oxygen amount of injection, according to the signal fed back after detection to pure oxygen input quantity into
Row is adjusted, and oxygen concentration is made to be maintained at the ideal oxygen values of setting.
Further, it is further comprised the steps of: after the igniting
It closes and injects the gas injection module of pure oxygen into shale gas reservoir and carry out the bored well of setting time threshold value.
To achieve the above object, the present invention also provides following technical solutions:
A kind of mining system of shale gas, including shale gas reservoir, the mining system of the shale gas further include:
Gas injection module, for injecting pure oxygen into shale gas reservoir；
The flow of gas flow adjustment module, the pure oxygen for injecting to gas injection module is adjusted；
Gas collection module, for collecting desorption and pyrogenous origin shale gas.
Further, the gas injection module includes ventilation pipe, and the shale gas reservoir includes being connected to ventilation pipe
Horizontal well, the pure oxygen are transferred into horizontal well by ventilation pipe.
Further, the ventilation pipe is equipped with the gas concentration of igniter and the pure oxygen amount for detecting injection
Detector.
Further, the pipeline is telescopic pipeline, in the extending direction and horizontal well of the telescopic pipeline
Extending direction it is identical, can be according to requiring the different location being delivered to pure oxygen in horizontal well.
Further, the shale gas reservoir further includes vertical shaft, and the horizontal well is connected to the vertical shaft, the gas injection mould
Block includes the metallic sleeve gasket for being mounted on horizontal well Yu vertical shaft junction.
Further, the vertical shaft includes several horizontal wells, and the gas injection module is only connected to one of horizontal well,
It is not connected to other horizontal wells for gas collection.
Further, the gas collection module includes collecting pipe, and the collecting pipe is connected to the horizontal well for gas collection,
The desorption enters collecting pipe by the horizontal well for gas collection with pyrogenous origin shale gas.
It can be seen from the above technical proposal that the recovery method and system structure of the shale gas of the embodiment of the present invention are simple,
Without providing additional fuel from external, promote adsorbed gas desorption and kerogenic pyrolysis, improve the infiltration of shale gas reservoir
Saturating rate, to improve the production efficiency of shale gas.
Compared with prior art, the beneficial effects of the present invention are:
1, the present invention be to shale gas reservoir inject high-purity oxygen, and with the hydrocarbon mixing after-burning in reservoir
It burns, improves the porosity and permeability of shale using the heat that burning generates.
2, the present invention carries out combustion reaction using pure oxygen and shale gas, and the flame temperature of pure oxygen burning is higher, the heat provided
Amount is more sufficient, the shale gas in shale gas reservoir is desorbed more abundant with kerogen pyrolysis.
3, the present invention carries out heat production by the burning of the shale gas such as pure oxygen and hydrocarbon, such as methane, stores up shale gas
Gas in layer expands since temperature raises, increases the pressure in burning well, and shale gas is promoted to flow into collecting pipe.
4, combustion product of the invention is carbon dioxide and water, and there are no pollution to the environment；Meanwhile in shale gas reservoir,
The adsorption capacity of carbon dioxide is better than methane, and the carbon dioxide for generation of burning can displace methane molecule from reservoir pore space
Come, improves the output of shale gas.
Detailed description of the invention
Fig. 1 is the flow chart of the recovery method of shale gas of the present invention.
Fig. 2 is the schematic diagram of the mining system of shale gas of the present invention.
Fig. 3 is the connection schematic diagram of gas injection module and horizontal well in the mining system of shale gas of the present invention.
Fig. 4 is the schematic diagram of the horizontal well selection of horizontal well arrangement and burning in the mining system of shale gas of the present invention.
Wherein: 1- vertical shaft, 2- horizontal well (gas collection), 3- horizontal well (burning), 4- shale gas reservoir, 5- gas injecting pipe, 6-
Metallic sleeve gasket.
Specific embodiment
The invention discloses a kind of recovery method of shale gas and systems, pass through the methane in part burning shale gas reservoir
Equal imflammable gas, without providing additional fuel from external, promote adsorbed gas desorption and kerogenic pyrolysis, improve page
The permeability of rock gas reservoir, to improve the production efficiency of shale gas.
As shown in Figure 1, the recovery method of shale gas of the invention comprising step:
S101: shale gas reservoir is obtained.
Wherein, after obtaining suitable shale gas reservoir, drilling well is carried out to shale gas reservoir and obtains vertical shaft, every mouthful of vertical shaft exists
Multiple horizontal wells are connected within the scope of shale gas reservoir, and one of horizontal well is selected to use as burning.In one embodiment, may be used
To bore three mouthfuls of vertical shafts, every mouthful of vertical shaft connects three mouthfuls of water horizontal wells within the scope of shale gas reservoir.In other embodiments, vertical shaft and
The quantity for the horizontal well connecting with vertical shaft determines according to actual needs.
S102: choosing the burning well in shale gas reservoir, inject pure oxygen into the burning well, makes diffusion in pure oxygen and reservoir
Hydrocarbon mixing out, forms flammable gaseous mixture.
Wherein, in one embodiment, it in order to enable shale reservoir transmitting heat is fast in subsequent step, selects close to intermediate
Burning well of the horizontal well as burning, remaining non-burning horizontal well used is as collection gas well.
S103: flammable gaseous mixture a little fight to generate heat.
Wherein, it is lighted a fire by igniter to gaseous mixture, a large amount of heat of burning generation, which can have shale gas reservoir, to be added
The effect of heat makes shale gas reservoir generate the crack for being conducive to gas flowing.The high temperature and high pressure environment that burning generates can drive storage
Methane in layer is flowed to the gas collection horizontal well of low pressure.
Wherein, the carbon dioxide of generation of burning has stronger adsorption capacity than methane, can displace in reservoir pore space
Methane molecule improves gas production；Also, combustion product is carbon dioxide and water, and there are no pollution to the environment.
The heat that the transmitting of S104: Xiang Suoshu shale reservoir generates keeps the gas being adsorbed in shale matrix pores network de-
It is attached, and solid kerogen pyrolysis is made to generate pyrolysis gas, to obtain shale gas.
Wherein, it is further comprised the steps of: before the igniting
Set ideal oxygen values, detect the pure oxygen amount of injection, according to the signal fed back after detection to pure oxygen input quantity into
Row is adjusted, and oxygen concentration is made to be maintained at the ideal oxygen values of setting.
It is further comprised the steps of: after the igniting
It closes and injects the gas injection module of pure oxygen into shale gas reservoir and carry out the bored well of setting time threshold value.
Specifically, closing gas injection module after igniting and carrying out bored well, the time of bored well is the time threshold set, should
Time threshold can according to the actual situation depending on, after the pressure of shale gas reservoir is stablized, by gas collection module to horizontal well and
Gas in vertical shaft is collected.
The mining system of shale gas of the invention comprising:
Shale gas reservoir；
Gas injection module, for injecting pure oxygen into shale gas reservoir, by injecting high-purity oxygen to shale gas reservoir, and
With the methyl hydride combustion in reservoir, improve the porosity and permeability of shale using the heat that burning generates, the fire of pure oxygen burning
Flame temperature is higher, and the heat provided is more sufficient, the shale gas in shale gas reservoir is desorbed more abundant with kerogen pyrolysis；
The flow of gas flow adjustment module, the pure oxygen for injecting to gas injection module is adjusted；
Gas collection module, for collecting desorption and pyrogenous origin shale gas.
The present invention carries out heat production by the burning of the shale gas such as pure oxygen and methane, makes the gas and burning in shale gas reservoir
Product expands since temperature raises, increases the pressure in burning well, promotes flowing of the shale gas into collection gas well.
After the shale gas reservoir chooses, drilling well is carried out to shale gas reservoir and obtains vertical shaft, every mouthful of vertical shaft is in shale
Multiple horizontal wells are connected within the scope of gas reservoir, horizontal well is used as burning and gas collection.In one embodiment, three mouthfuls can be bored to erect
Well, every mouthful of vertical shaft connect three mouthfuls of water horizontal wells within the scope of shale gas reservoir.In other embodiments, it vertical shaft and is connect with vertical shaft
The quantity of horizontal well determine according to actual needs.
In one embodiment, in order to keep shale reservoir transmitting heat in subsequent step fast, level of the selection close to centre
Burning well of the well as burning, remaining non-burning horizontal well used is as collection gas well.
The gas injection module includes ventilation pipe, and the shale gas reservoir includes the horizontal well being connected to ventilation pipe, institute
It states pure oxygen and horizontal well is transferred by ventilation pipe.Pure oxygen is admitted in horizontal well by ventilation pipe, in horizontal well with
The mixing of the hydrocarbons such as the methane being desorbed out in shale gas reservoir forms flammable gaseous mixture.
The ventilation pipe is equipped with the gas concentration detector of igniter and the pure oxygen amount for detecting injection.It is logical
Igniter to be crossed to light a fire to flammable gaseous mixture, burning generates the effect that a large amount of heat can have heating to shale gas reservoir,
Shale gas reservoir is set to generate the crack for being conducive to gas flowing.The high temperature and high pressure environment that burning generates can drive the methane in reservoir
It is flowed to the gas collection horizontal well of low pressure；Meanwhile the carbon dioxide for generation of burning has stronger adsorption capacity than methane, can replace
Methane molecule in reservoir pore space out improves gas production.
In one embodiment, ideal oxygen values are set, by setting ideal oxygen values, are detected using gas concentration
The pure oxygen amount of device detection injection, is adjusted pure oxygen input quantity according to the signal fed back after detection, is maintained at oxygen concentration
The ideal oxygen values of setting.
The pipeline is telescopic pipeline, the extending direction in the extending direction and horizontal well of the telescopic pipeline
It is identical, so as to can be according to requiring the different location being delivered to pure oxygen in horizontal well.
The shale gas reservoir further includes vertical shaft, and the horizontal well is connected to the vertical shaft, and the gas injection module includes peace
Mounted in the metallic sleeve gasket of horizontal well and vertical shaft junction.
The vertical shaft includes several horizontal wells, and the gas injection module is only connected to one of horizontal well, with other use
It is not connected in the horizontal well of gas collection.
The vertical shaft includes several, and each vertical shaft includes several horizontal wells, and several horizontal wells are erected with corresponding
Well connection.The function of burning and gas collection can be achieved in each horizontal well, improves the utilization efficiency of pit shaft.It is selected as burning
Horizontal well 2 around the horizontal well used is by by the horizontal well as gas collection, so that each horizontal well is efficiently utilized,
The breadth and depth of shale gas exploitation is set to be greatly improved.
The gas collection module includes collecting pipe, and the collecting pipe is connected to the horizontal well for gas collection, the desorption
Collecting pipe is entered by gas collection horizontal well with pyrogenous origin shale gas.
It after igniting, closes gas injection module and carries out bored well, the time of bored well is the time threshold set, the time threshold
Can according to the actual situation depending on, after shale gas reservoir pressure stablize after, by gas collection module in horizontal well and vertical shaft
Gas is collected.
It is further described below with reference to the one embodiment of specific attached drawing to the mining system of shale gas of the present invention.
As shown in Fig. 2, according to existing construction technology, by choosing suitable shale gas reservoir 4 and drilling through three mouthfuls of vertical shafts
1, every mouthful of vertical shaft is all connected with three mouthfuls of water horizontal wells.Second horizontal well 3 that second mouthful of vertical shaft connects in Fig. 2 is selected to use as burning
Horizontal well, be used for combustion heating.Horizontal well 3 and vertical shaft junction are equipped with metallic sleeve gasket 6, for the close of horizontal well
Envelope.Remaining horizontal well 2 is used to gas collection.
As shown in figure 3, before combustion heating, gas injecting pipe 5 protrudes into the horizontal well 3 of burning, and by the opening of horizontal well 3
End is sealed by metallic sleeve gasket 6.Igniter and gas concentration detection device are housed simultaneously on gas injecting pipe 5.Input
After pure oxygen, oxygen concentration is monitored by gas concentration detection device, stops gas transmission after reaching required concentration, and carry out igniting behaviour
Make.The retractable in horizontal well 3 of gas injecting pipe 5 makes oxygen convenient for pure oxygen to be delivered to the different location in horizontal well 3
It mixes more evenly, burns more abundant, heat transfer is also more uniform with imflammable gas such as methane.
In one embodiment, can suitably continue to be passed through pure oxygen in reaction process to achieve the purpose that control extent of reaction.
The amount of oxygen being specifically passed through according to the actual situation depending on.
In one embodiment, carry out bored well after gas injection igniting, the time of bored well is 15 days, can according to the actual situation and
It is fixed.
In one embodiment, after the pressure in shale gas reservoir is stablized, gas collection operation is carried out, collecting pipe pair is passed through
Shale gas in each gas collection horizontal well 2 and vertical shaft 1 is collected.
The mining system of shale gas in Fig. 2 is a repeatable structural unit.For example, the level of the gas collection in Fig. 2
Well 2 can be used as the horizontal well of burning, and mode of operation is same as above, and the function of burning and gas collection can be achieved in each horizontal well,
The utilization efficiency of pit shaft is improved, it is specific as shown in Figure 4.This repeatable unit can be expanded horizontal and vertical, in Fig. 4
Horizontal well 3 and 3 ' can be used as burning well, and being selected as horizontal well 2 around the horizontal well that burning is used will be by as gas collection
Horizontal well has obtained the breadth and depth of shale gas exploitation greatly to efficiently utilize each horizontal well
It improves.
The configuration of the present invention is simple can control the degree of burning by the supply amount of oxygen；In the horizontal well internal combustion of sealing
It burns, flame does not enter in vertical shaft, securely and reliably；Without additional fuel for heating, good economy performance；Combustion product is mainly water
And carbon dioxide, environmental pollution are small.Meanwhile the function of burning and gas collection can be achieved in each horizontal well, improves pit shaft
Utilization efficiency.
Compared with prior art, the beneficial effects of the present invention are:
1, the present invention be to shale gas reservoir inject high-purity oxygen, and with the hydrocarbon mixing after-burning in reservoir
It burns, improves the porosity and permeability of shale using the heat that burning generates.
2, the present invention carries out combustion reaction using pure oxygen and shale gas, and the flame temperature of pure oxygen burning is higher, the heat provided
Amount is more sufficient, the shale gas in shale gas reservoir is desorbed more abundant with kerogen pyrolysis.
3, the present invention carries out heat production by the burning of the shale gas such as pure oxygen and hydrocarbon, such as methane, stores up shale gas
Gas in layer expands since temperature raises, increases the pressure in burning well, and shale gas is promoted to flow into collecting pipe.
4, combustion product of the invention is carbon dioxide and water, and there are no pollution to the environment；Meanwhile in shale gas reservoir,
The adsorption capacity of carbon dioxide is better than methane, and the carbon dioxide for generation of burning can displace methane molecule from reservoir pore space
Come, improves the output of shale gas.
The above is only a preferred embodiment of the present invention, it is not intended to restrict the invention, it is noted that for this skill
For the those of ordinary skill in art field, without departing from the technical principles of the invention, can also make it is several improvement and
Modification, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (10)
1. a kind of recovery method of shale gas, which is characterized in that itself comprising steps of
Obtain shale gas reservoir；
The burning well in shale gas reservoir is chosen, injects pure oxygen into the burning well, so that diffused out in pure oxygen and reservoir
Hydrocarbon mixing forms flammable gaseous mixture；
Flammable gaseous mixture a little fight to generate heat；
The heat generated to shale gas reservoir transmitting, makes the desorbing gas being adsorbed in shale matrix pores network, and make
Solid kerogen pyrolysis generates pyrolysis gas, to obtain shale gas.
2. the recovery method of shale gas according to claim 1, which is characterized in that further comprised the steps of: before the igniting
Ideal oxygen values are set, the pure oxygen amount of injection is detected, pure oxygen input quantity is adjusted according to the signal fed back after detection
Section, makes oxygen concentration be maintained at the ideal oxygen values of setting.
3. the recovery method of shale gas according to claim 1, which is characterized in that further comprised the steps of: after the igniting
It closes and injects the gas injection module of pure oxygen into shale gas reservoir and carry out the bored well of setting time threshold value.
4. a kind of mining system of shale gas, including shale gas reservoir, which is characterized in that the mining system of the shale gas also wraps
It includes:
Gas injection module, for injecting pure oxygen into shale gas reservoir；
The flow of gas flow adjustment module, the pure oxygen for injecting to gas injection module is adjusted；
Gas collection module, for collecting desorption and pyrogenous origin shale gas.
5. the mining system of shale gas according to claim 4, which is characterized in that the gas injection module includes snorkel
Road, the shale gas reservoir include the horizontal well being connected to ventilation pipe, and the pure oxygen is transferred into level by ventilation pipe
Well.
6. the mining system of shale gas according to claim 5, which is characterized in that the ventilation pipe is equipped with igniting dress
It sets and for detecting the gas concentration detector for injecting pure oxygen amount.
7. the mining system of shale gas according to claim 5, which is characterized in that the pipeline is telescopic pipeline,
The extending direction of the telescopic pipeline is identical as the extending direction in horizontal well, can be according to requiring pure oxygen being delivered to level
Different location in well.
8. the mining system of shale gas according to claim 5, which is characterized in that the shale gas reservoir further includes erecting
Well, the horizontal well are connected to the vertical shaft, and the gas injection module includes being mounted on horizontal well and the metal of vertical shaft junction is close
Big envelope.
9. the mining system of shale gas according to claim 8, which is characterized in that the vertical shaft includes several levels
Well, the gas injection module are only connected to one of horizontal well, are not connected to other horizontal wells for gas collection.
10. the mining system of shale gas according to claim 9, which is characterized in that the gas collection module includes gas collecting tube
Road, the collecting pipe are connected to the horizontal well for gas collection, and the desorption and pyrogenous origin shale gas are by for gas collection
Horizontal well enters collecting pipe.
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| CN201910353071.2A CN110017125A (en) | 2019-04-29 | 2019-04-29 | A kind of recovery method and system of shale gas |
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| CN201910353071.2A CN110017125A (en) | 2019-04-29 | 2019-04-29 | A kind of recovery method and system of shale gas |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN113279727A (en) * | 2021-05-19 | 2021-08-20 | 苏州大学 | Shale gas exploitation system and method |
| CN113338888A (en) * | 2021-07-05 | 2021-09-03 | 中国矿业大学 | Method for promoting vertical shaft shale gas exploitation by horizontal branch well combustion explosion fracturing |
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| CN113338888A (en) * | 2021-07-05 | 2021-09-03 | 中国矿业大学 | Method for promoting vertical shaft shale gas exploitation by horizontal branch well combustion explosion fracturing |
| CN113338888B (en) * | 2021-07-05 | 2022-05-13 | 中国矿业大学 | Method for promoting vertical shaft shale gas exploitation by horizontal branch well combustion explosion fracturing |
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