CN110469306A - Coal seam oil reservoir underground detonation direction and location crack gas injection produces gas method - Google Patents
Coal seam oil reservoir underground detonation direction and location crack gas injection produces gas method Download PDFInfo
- Publication number
- CN110469306A CN110469306A CN201910716482.3A CN201910716482A CN110469306A CN 110469306 A CN110469306 A CN 110469306A CN 201910716482 A CN201910716482 A CN 201910716482A CN 110469306 A CN110469306 A CN 110469306A
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- Prior art keywords
- coal seam
- well
- gas
- oil reservoir
- coal
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- 239000003245 coal Substances 0.000 title claims abstract description 74
- 238000002347 injection Methods 0.000 title claims abstract description 29
- 239000007924 injection Substances 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000005474 detonation Methods 0.000 title claims abstract description 19
- 239000007789 gas Substances 0.000 claims abstract description 81
- 238000011084 recovery Methods 0.000 claims abstract description 32
- 238000002485 combustion reaction Methods 0.000 claims abstract description 17
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000001301 oxygen Substances 0.000 claims abstract description 14
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 14
- 238000005553 drilling Methods 0.000 claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 23
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 23
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 14
- 229910002091 carbon monoxide Inorganic materials 0.000 claims description 14
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 13
- 239000001257 hydrogen Substances 0.000 claims description 13
- 229910052739 hydrogen Inorganic materials 0.000 claims description 13
- 239000001569 carbon dioxide Substances 0.000 claims description 10
- 150000002431 hydrogen Chemical class 0.000 claims description 8
- 238000001914 filtration Methods 0.000 claims description 6
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 5
- 239000000428 dust Substances 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 230000009471 action Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims 2
- 239000003795 chemical substances by application Substances 0.000 description 4
- 210000003128 head Anatomy 0.000 description 4
- 239000002699 waste material Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 238000002309 gasification Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 210000000158 ommatidium Anatomy 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 239000003870 refractory metal Substances 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000006467 substitution reaction Methods 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
-
- 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
- E21B43/247—Combustion in situ in association with fracturing processes or crevice forming processes
-
- 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
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)
- Air Supply (AREA)
Abstract
The embodiment of the present invention provide a kind of underground detonation direction and location crack gas injection of coal seam oil reservoir produce gas method, the coal seam oil reservoir detonation direction and location crack produce gas method include: building horizontal channel, in deep layer coal seam Directional Drilling fetch water horizontal well；A plurality of mutually independent crack is formed to horizontal well in segments perforating and fracturing using oil pipe injection mode；Surface at each section of pressure break perforation drills through a gas recovery well by gas injection well injection air, oxygen and steam, keeps strata pressure more than 22.17 megapascal；From horizontal well well head, to seat earth tripping in igniter, using advance sparking mode, so that coal seam temperature reaches 578 degrees Celsius or more；The advance sparking mode is lighted a fire since the gas recovery well of end, and sectional combustion coal seam has been burnt one section, has been discharged by gas recovery well, then burns next section.
Description
Technical field
The present invention relates to a kind of deep coal underground gasification recovery method more particularly to a kind of underground detonation of coal seam oil reservoir are fixed
Gas method is produced to positioning gas injection crack.
Background technique
The success of coal underground gasification technology is often depending on good connectivity between injection well and producing well.The company of getting through
Connect the method that reverse combustion is generally taken in road.So-called burning is exactly to light coal seam in first mouth subsurface, is burnt to second mouth direction
It carries out, and blasts gasifying agent at second mouth simultaneously, gasifying agent side pushes ahead, the direction of propulsion in coal combustion direction and gasifying agent
On the contrary.Reverse combustion mode the most frequently used also feasible method when being also opening connecting passages in current engineering.
In realizing process of the present invention, at least there are the following problems in the prior art for inventor's discovery: reverse combustion is caused
It burns insufficient, coal resources waste.
Summary of the invention
Detonation direction and location crack produces gas method to the embodiment of the present invention with providing a kind of coal seam oil reservoir, can solve insufficient combustion
The problems such as burning, due to permeability low the problem of can not burning, and reducing coal resources waste.
A kind of the embodiment of the invention provides coal seam oil reservoir detonation direction and location crack gas injection produces gas method, the coal seam
Oil reservoir detonation direction and location crack produce gas method include:
Horizontal channel is constructed, the Directional Drilling water intaking horizontal well in deep layer coal seam；
A plurality of mutually independent crack is formed to horizontal well in segments perforating and fracturing using oil pipe injection mode；
Surface at each section of pressure break perforation drills through a gas recovery well
By gas injection well injection air, oxygen and steam, keep strata pressure more than 22.17 megapascal；
From horizontal well well head, to seat earth tripping in igniter, using advance sparking mode, so that coal seam temperature reaches
578 degrees Celsius or more；The advance sparking mode is lighted a fire since the gas recovery well of end, and sectional combustion coal seam has burnt one
Section, is discharged, then burn next section by gas recovery well；
Oxygen and coal combustion generate carbon dioxide and heat；
After combustion reaction, oxygen is all consumed, and carbon dioxide and coal generate carbon monoxide under the action of heat
And hydrogen；
Heat acts on the coal seam of dry section, releases coal bed gas；Carbon monoxide is reacted with hydrogen, carbon dioxide and hydrogen
Generate methane；
Carbon monoxide, hydrogen, methane is discharged by gas recovery well.
Preferably, the coal seam oil reservoir detonation direction and location crack produce gas method further include: by horizontal well to shaft bottom
Nuke rubbish is injected in coal seam, reacts with the remaining coal in underground and generates carbon monoxide and methane.
Preferably, it is provided with dust filtering device in the gas recovery well and gas injection well, by dust-filtering and stays in underground.
Preferably, 50 meters are spaced between each gas recovery well.
Preferably, packer is provided in the gas recovery well.
Above-mentioned technical proposal has the following beneficial effects: because the technological means lighted a fire using protrusive, is reached
Burning sufficiently, produces coal bed gas of the preservation in coal seam in advance, preferably utilizes the technical effect of natural energy source.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the main view of arrangement well pattern of the invention；
Fig. 2 is the plan view of igniter of the invention；
Drawing reference numeral: 1. ground, 2. coal seams, 3. gas injection wells, 4. gas recovery wells, 5. horizontal channels, 6. igniters.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The embodiment of the invention provides a kind of coal seam oil reservoir detonation direction and location crack produces gas method, institute as shown in Figure 1, Figure 2
Show, the coal seam oil reservoir detonation direction and location crack produce gas method include:
Horizontal channel 5 is constructed, the Directional Drilling water intaking horizontal well in deep layer coal seam；The horizontal channel is located in coal seam 2, convenient
Heat coal seam；
A plurality of mutually independent crack is formed to horizontal well in segments perforating and fracturing using oil pipe injection mode；What is formed splits
Coal bed fracturing can be facilitated the coal bed gas overflowed in coal seam, and pressure break goes out to facilitate setting gas recovery well by seam；
Surface at each section of pressure break perforation drills down to a gas recovery well 4 from ground 1；In this way, by horizontal
Channel is divided into multiple sections, facilitates segmentation extraction coal bed gas, carbon monoxide, hydrogen, and underground combustion can be observed by gas recovery well
Burn situation；
Air, oxygen and steam are injected by gas injection well 3, keep strata pressure more than 22.17 megapascal；The pressure is to occur
One of the condition of following chemical reactions, interior air, oxygen and the steam injected of gas injection well is as gasifying agent；
From horizontal well well head, to seat earth tripping in igniter 6, using advance sparking mode, so that coal seam temperature reaches
To 578 degrees Celsius or more；The advance sparking mode is lighted a fire since the gas recovery well of end, and sectional combustion coal seam has been burnt
It one section, is discharged, then burnt next section by gas recovery well；The gas recovery well of the end is to deviate from gas injection well and shaft bottom is connected
A farthest gas recovery well burns to gas injection well direction；The method is fired better than the flexible igniting of previous retroversion using protrusive
It burns, while convenient for monitoring, the oxygen injected by pipeline is preferably utilized, the microcrack generated in coal seam disconnects bulk
Coal seam block, reduces the density of seam suitably, and combustion-supporting gas spreads out, and burns more abundant, maximumlly improves effective gas
The generation of body；
Oxygen and coal combustion generate carbon dioxide and heat；Condition of the generated heat as following chemical reactions；
After combustion reaction, oxygen is all consumed, and carbon dioxide and coal generate carbon monoxide under the action of heat
And hydrogen；That is the reduction reaction of carbon dioxide, CO2+ C==2CO -162.4MJ/kmol；
Heat acts on the coal seam of dry section, releases coal bed gas；Carbon monoxide is reacted with hydrogen, carbon dioxide and hydrogen
Generate methane；Methanation reaction: CO+3H2==CH4+H2O+206.4MJ/kmol；2CO+2H2==CH4+CO2+247.4MJ/
kmol；CO2+4H2==CH4+2H2O+165.4MJ/kmol；
Carbon monoxide, hydrogen, methane is discharged by gas recovery well, the gas recovery well, gas injection bottom are provided with multiple packings
Device, for preventing fires.
Preferably, the coal seam oil reservoir detonation direction and location crack produce gas method further include: by horizontal well to shaft bottom
Nuke rubbish is injected in coal seam, reacts with the remaining coal in underground and generates carbon monoxide and methane；Thermal energy is generated by nuke rubbish, it will be remaining
Coal chemically reacted, output carbon monoxide and methane.
Preferably, it is provided with dust filtering device in the gas recovery well and gas injection well, by dust-filtering and stays in underground；It keeps away
Exempt from dust to be discharged by gas recovery well and gas injection well, prevents dust explosion.
Preferably, it is spaced 50 meters between each gas recovery well, facilitates the coal in every section of gas recovery well sufficiently to react, avoids
Energy waste.
Preferably, packer is provided in the gas recovery well；Packer is for placing explosion and sectional combustion.
Specific embodiment:
1, reasonable well spacing, Directional Drilling water intaking horizontal well, constructs horizontal channel in coal seam.
2, optimize structure in well, using oil pipe injection mode, to pressurize, one body technique of perforation carries out horizontal well fracturing,
The a plurality of mutually independent crack of stroke.Pressure break spacing 50m.
3, the surface at each section of pressure break perforation, it is horizontally arranged to drill through ommatidium, as gas recovery well.
4, from horizontal well well head, as the flexible igniter of coal seam tripping in, device front end is equipped with refractory metal shell, built-in
Positioning system and igniter head, auxiliary gas injection pipeline provide combustion-supporting oxygen material, the igniting of device outer jet, microcrack periphery of igniting in time
Coal seam.
5, to be combusted flexible probe and pipeline are pushed ahead, and continuation is burnt forward completely, light coal at next place's perforation
Layer.
6, the method stretches better than previous retroversion and lights a fire, and is burnt using protrusive, preferably sharp while convenient for monitoring
With the oxygen injected by pipeline, the microcrack generated in coal seam disconnects bulk coal seam block, subtracts the density of seam suitably
Few, combustion-supporting gas spreads out, and burns more abundant, the maximized generation for improving available gas.
Above-described specific embodiment has carried out further the purpose of the present invention, technical scheme and beneficial effects
It is described in detail, it should be understood that being not intended to limit the present invention the foregoing is merely a specific embodiment of the invention
Protection scope, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should all include
Within protection scope of the present invention.
Claims (5)
1. a kind of underground detonation direction and location crack gas injection of coal seam oil reservoir produces gas method, which is characterized in that the coal seam oil reservoir
Detonation direction and location crack produces gas method
Horizontal channel is constructed, the Directional Drilling water intaking horizontal well in deep layer coal seam；
A plurality of mutually independent crack is formed to horizontal well in segments perforating and fracturing using oil pipe injection mode；
Surface at each section of pressure break perforation drills through a gas recovery well；
By gas injection well injection air, oxygen and steam, keep strata pressure more than 22.17 megapascal；
From horizontal well well head, to seat earth tripping in igniter, using advance sparking mode, so that coal seam temperature reaches 578
Degree Celsius or more；The advance sparking mode is lighted a fire since the gas recovery well of end, and sectional combustion coal seam has been burnt one section,
It is discharged, then burnt next section by gas recovery well；
Oxygen and coal combustion generate carbon dioxide and heat；
After combustion reaction, oxygen is all consumed, and carbon dioxide and coal generate carbon monoxide and hydrogen under the action of heat
Gas；
Heat acts on the coal seam of dry section, releases coal bed gas；Carbon monoxide reacts generation with hydrogen, carbon dioxide and hydrogen
Methane；
Carbon monoxide, hydrogen, methane is discharged by gas recovery well.
2. coal seam oil reservoir as described in claim 1 detonation direction and location crack produce gas method, which is characterized in that the coal seam
Oil reservoir detonation direction and location crack produce gas method further include: nuke rubbish is injected to shaft bottom coal seam by horizontal well, it is surplus with underground
Remaining coal reaction generates carbon monoxide and methane.
3. coal seam oil reservoir as described in claim 1 detonation direction and location crack produce gas method, which is characterized in that the gas production
It is provided with dust filtering device in well and gas injection well, by dust-filtering and stays in underground.
4. coal seam oil reservoir as described in claim 1 detonation direction and location crack produce gas method, which is characterized in that it is described each
50 meters are spaced between gas recovery well.
5. coal seam oil reservoir as described in claim 1 detonation direction and location crack produce gas method, which is characterized in that the gas production
Packer is provided in well.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910716482.3A CN110469306A (en) | 2019-08-05 | 2019-08-05 | Coal seam oil reservoir underground detonation direction and location crack gas injection produces gas method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910716482.3A CN110469306A (en) | 2019-08-05 | 2019-08-05 | Coal seam oil reservoir underground detonation direction and location crack gas injection produces gas method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110469306A true CN110469306A (en) | 2019-11-19 |
Family
ID=68509430
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910716482.3A Pending CN110469306A (en) | 2019-08-05 | 2019-08-05 | Coal seam oil reservoir underground detonation direction and location crack gas injection produces gas method |
Country Status (1)
| Country | Link |
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| CN (1) | CN110469306A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114278270A (en) * | 2020-09-27 | 2022-04-05 | 中国石油大学(北京) | Methane in-situ control combustion-explosion fracturing method and device |
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| CN114278270A (en) * | 2020-09-27 | 2022-04-05 | 中国石油大学(北京) | Methane in-situ control combustion-explosion fracturing method and device |
| CN114278270B (en) * | 2020-09-27 | 2023-09-26 | 中国石油大学(北京) | Methane in-situ control blasting fracturing method and device |
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Application publication date: 20191119 |
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