CN117404069A - Continuous oil pipe dragging type supercritical water injection coal rock underground gasification method - Google Patents
Continuous oil pipe dragging type supercritical water injection coal rock underground gasification method Download PDFInfo
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- CN117404069A CN117404069A CN202311235173.7A CN202311235173A CN117404069A CN 117404069 A CN117404069 A CN 117404069A CN 202311235173 A CN202311235173 A CN 202311235173A CN 117404069 A CN117404069 A CN 117404069A
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- 239000003245 coal Substances 0.000 title claims abstract description 100
- 238000002309 gasification Methods 0.000 title claims abstract description 65
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 title claims abstract description 48
- 239000011435 rock Substances 0.000 title claims abstract description 25
- 238000002347 injection Methods 0.000 title claims abstract description 14
- 239000007924 injection Substances 0.000 title claims abstract description 14
- 230000008569 process Effects 0.000 claims abstract description 14
- 238000000926 separation method Methods 0.000 claims abstract description 9
- 238000007599 discharging Methods 0.000 claims abstract description 4
- 238000006243 chemical reaction Methods 0.000 claims description 11
- 239000007921 spray Substances 0.000 claims description 11
- 238000005553 drilling Methods 0.000 claims description 6
- 239000006227 byproduct Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- 239000005416 organic matter Substances 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 17
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 abstract description 4
- 229910002092 carbon dioxide Inorganic materials 0.000 abstract description 2
- 239000001569 carbon dioxide Substances 0.000 abstract description 2
- 238000010304 firing Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 12
- 238000002485 combustion reaction Methods 0.000 description 9
- 238000010276 construction Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 5
- 230000009466 transformation Effects 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 238000002407 reforming Methods 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 238000009933 burial Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 230000001131 transforming effect Effects 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
- E21B43/295—Gasification of minerals, e.g. for producing mixtures of combustible gases
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
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- 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)
- Geophysics (AREA)
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
Abstract
The invention provides a continuous oil pipe dragging type supercritical water injection coal rock underground gasification method. The method comprises the following steps: step 1: injecting water with the temperature of 374.3 ℃ or higher into a coal bed through a draggable continuous oil pipe, controlling the pressure in the continuous oil pipe and the pressure at the bottom of the well to be 22.1MPa or higher, injecting high-temperature and high-speed supercritical water jet to break up coal and rock, enabling supercritical water to react with coal to obtain combustible gas, and forming a gasification cavity; step 2: after forming the gasification cavity, dragging the draggable continuous oil pipe to the next position, and repeating the jet flow process to form another gasification cavity; step 3: discharging the combustible gas to the ground and recovering H by gas-water separation 2 . The technical scheme of the invention is that the underground coal gasification technology can be organically coupled with carbon dioxide capturing and utilizing and burying technologies while the power-assisted deep coal seam resources are efficiently utilized, and is expected to effectively absorb and digest coal combustionCO generated during the firing process 2 。
Description
Technical Field
The invention relates to a continuous oil pipe dragging type supercritical water injection coal rock underground gasification method, and belongs to the technical field of coal gasification.
Background
Underground coal gasification technology (UCG) is controlled combustion of underground coal in situ to produce CH 4 、H 2 The process of combustible gas such as CO and the like is a coal clean development and utilization technology integrating three processes of well construction, coal mining and gasification, can promote the development and utilization of deep coal seams, greatly improves the resource utilization efficiency, is used as a potential coal clean exploitation means, is not applied in a large scale due to the restriction of factors such as technology and economy, and still is in an engineering test stage and needs to be subjected to key technology attack. In addition, the existing engineering test projects mainly adopt shallow coal seams, and the technology is relatively mature.
However, compared with the shallow coal seam, the underground gasification of the deep coal is more advantageous in the aspect of environmental protection, but the deep coal seam has the characteristics of high ground stress, medium and high temperature, extremely low permeability, high saturation, strong compressibility and the like, and the key technology for restricting the development of the underground gasification of the deep coal is further required to be overcome.
In recent years, the key engineering technology of the UCG (deep coal reservoir) mainly surrounds the U-shaped gasifier construction technology and the controllable gas injection point back-off gasification process (CRIP). However, because underground coal gasification is in-situ combustion exploitation of coal, in order to keep combustion continuity, the drilling rate of a coal bed in a horizontal well section is theoretically required to reach 100%, and the well track control of the horizontal well and the underground accurate butt joint of the horizontal well and a production vertical well bring great challenges to the construction of a U-shaped gasification furnace. The CRIP technology is applicable to the feasibility of deep coal underground gasification engineering, but the coal seam is shallower in the current field test, and the applicability is still to be further practically checked.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide the underground coal and rock gasification method which is based on the dragging type continuous oil pipe and supercritical water injection coal and rock technology and is beneficial to the efficient utilization of deep coal seam resources.
In order to achieve the above purpose, the invention provides a continuous oil pipe dragging type supercritical water injection coal rock underground gasification method, which comprises the following steps:
step 1: injecting water with the temperature of 374.3 ℃ or higher into a coal bed through a draggable continuous oil pipe, controlling the pressure in the continuous oil pipe and the pressure at the bottom of the well to be 22.1MPa or higher, injecting high-temperature and high-speed supercritical water jet to break up coal and rock, enabling supercritical water to react with coal to obtain combustible gas, and forming a gasification cavity;
step 2: after forming the gasification cavity, dragging the draggable continuous oil pipe to the next position, and repeating the jet flow process to form another gasification cavity;
step 3: discharging the combustible gas to the ground and recovering H by gas-water separation 2 。
According to a specific embodiment of the present invention, preferably, the high temperature water is heated at the surface to a temperature of not less than 374.3 ℃ and then injected into the coal seam through the coiled tubing.
According to the specific embodiment of the invention, preferably, the high-temperature water is injected by adopting an oil pipe, and the annular space is in a closed state in the process, so that the heat preservation effect is realized while the bottom hole pressure is controlled.
According to the specific embodiment of the invention, the pressure in the oil pipe and the bottom hole pressure are preferably controlled to be more than 22.1MPa, so that the injected high temperature water can be in a supercritical state at 374.3 ℃.
According to a specific embodiment of the present invention, preferably, the step of ejecting the supercritical water jet at high temperature and high speed to break up coal and rock is implemented by a spray gun tool.
According to a specific embodiment of the present invention, preferably, the spray gun tool is a hole-making spray gun in CN114607278B or CN111395964B, which has good temperature and pressure resistance.
According to the specific embodiment of the invention, the high-temperature high-speed supercritical water jet flow is adopted to efficiently break the coal and rock, so that the subsequent reaction is quickened, the gasification cavity transformation effect is improved, the construction time is shortened, and the construction cost is saved. Meanwhile, jet flow can generate stress disturbance to form a pressure relief area, so that pressure relief, reflection increase and income improvement are realized, and cost reduction and efficiency increase are achieved.
According to the specific embodiment of the invention, the supercritical water forms supercritical water jet flow through the spray gun tool, so that the supercritical water continuously reacts with coal to convert coal chemical energy into hydrogen energy due to the characteristics of high temperature and high pressure, homogeneous oxidation and the like of the supercritical water while efficiently breaking coal and rock. Preferably, the reaction of supercritical water with coal comprises:
coal + supercritical water → CO 2 +H 2 +CH 4 ；
CO 2 +coal→co;
organic matter +O 2 →CO 2 +H 2 O。
According to a particular embodiment of the invention, the CO is preferably to be captured and/or separated at the surface 2 And injecting the coal bed into the gasification cavity.
According to a particular embodiment of the invention, the CO is preferably captured and/or separated in the gasification chamber 2 Reacts with carbon in the coal seam at high temperature to produce CO, which further reacts with water vapor (formed from supercritical water) to produce H 2 And CO 2 And obtaining the combustible gas.
According to a specific embodiment of the present invention, preferably, the main component of the combustible gas is CH 4 、H 2 CO, etc.
According to a specific embodiment of the present invention, preferably, the combustible gas formed in the gasification chamber is exhausted to the ground through the annulus, and the produced fluid is subjected to gas-water separation in the ground separation tank, and clean fuel H is separated and recovered 2 。
According to a specific embodiment of the invention, preferably, the method comprises the steps of: will beCO obtained by gas-water separation 2 And injecting the mixture into a gasification cavity of the coal bed to participate in the reaction in the gasification cavity. Through the reciprocating circulation process, the method is expected to effectively absorb and digest CO generated in the coal combustion process 2 。
According to a specific embodiment of the present invention, preferably, the method further comprises the steps of: and drilling the horizontal well into the coal seam, wherein the distances between the horizontal well and the top plate and the bottom plate of the coal seam are respectively more than or equal to 1m.
According to a specific embodiment of the present invention, the step 2 is preferably repeated, and the number of times of forming the gasification chamber is repeated is adjusted according to the actual stratum condition until the whole coal seam is fully utilized.
According to a particular embodiment of the invention, the method preferably comprises the following specific steps:
(1) Drilling a horizontal well to a target coal seam, wherein the distances between the horizontal well and a top plate and a bottom plate of the coal seam are respectively more than or equal to 1m;
(2) A continuous oil pipe provided with a spray gun tool is put into a coal bed;
(3) Injecting high-temperature water with the temperature of more than 374.3 ℃ into the coiled tubing from the ground;
(4) Controlling the pressure in the coiled tubing and the pressure at the bottom of the well to be more than 22.1MPa, spraying high-temperature and high-speed supercritical water jet at the bottom of the well to break coal and rock at the bottom of the well, enabling supercritical water to react with coal to obtain combustible gas, and forming a gasification cavity;
(5) After smoothly reforming the gasification cavity, dragging the continuous oil pipe to the next position, and repeating the steps (3) and (4), thereby forming a plurality of gasification cavities;
(6) The combustible gas is discharged out of the ground through an annulus, and H is recovered after gas-water separation on the ground 2 ；
(7) Separating the ground from the obtained CO 2 The byproducts are re-injected into the underground gasification cavity to participate in the reaction in the gasification cavity.
The continuous oil pipe dragging type supercritical water injection coal rock underground gasification method provided by the invention is suitable for deep coal seam resources, such as deep coal seams with the burial depth of 1500-3000 m.
The technical scheme of the invention is that the Underground Coal Gasification (UCG) technology can be used for capturing and utilizing carbon dioxide and is organically coupled with the burying technology (UCG-CCUS) while the power-assisted deep coal seam resources are utilized efficiently, and is expected to effectively absorb and digest CO generated in the coal combustion process 2 。
The method provided by the invention breaks the coal and rock by means of supercritical water jet impact, and breaks the coal and rock to improve the construction efficiency and gasification efficiency while forming a better reaction cavity, and can react in the gasification cavity, so that the gasification can be easier to carry out by breaking the coal blocks, the effect is better, and the jet can generate stress disturbance to form a pressure relief area, so that the pressure relief and permeability improvement can be realized. The cavitation gasification method has the advantages of increasing the contact area, improving the efficiency and the like. In addition, the method provided by the invention can realize multi-point transformation through one well and one pipe column, does not need ignition of a combustion well, has simple process, strong practicability and low cost, and can be used for transformation of a deep coal seam.
The invention provides a continuous oil pipe dragging type supercritical water injection coal rock underground gasification method by combining the advantages of a CRIP process, a continuous oil pipe technology and a supercritical water jet technology. The method of the invention can not only convey gasifying agent and igniter to the bottom of the well in UCG engineering, but also bind with temperature, pressure and other sensors to realize the combustion dynamic monitoring function, thereby controlling the injection of gasifying agent according to geological conditions and coal bed characteristics to ensure that the whole combustion process is stable and the produced components are optimal.
Drawings
Fig. 1 is a schematic diagram of a coal underground gasification method of coiled tubing dragging type supercritical water injection coal rock according to embodiment 1 of the present invention.
Detailed Description
The technical solution of the present invention will be described in detail below for a clearer understanding of technical features, objects and advantageous effects of the present invention, but should not be construed as limiting the scope of the present invention.
Example 1
The embodiment provides a continuous oil pipe dragging type supercritical water injection coal rock underground gasification method, which comprises the following steps:
(1) Drilling a horizontal well to a gasification reforming target coal seam with a burial depth of 1500-3000m, wherein the distances between the horizontal well and the top plate and the bottom plate of the coal seam are respectively more than or equal to 1m, so that the whole process is smoothly carried out in the target coal seam;
(2) The continuous oil pipe is utilized to send a spray gun tool to a preset reconstruction point, the spray gun tool uses a high-pressure resistant, temperature resistant and wear resistant spray gun (a hole-making spray gun in CN114607278B, CN 111395964B) developed by China university of Petroleum (Beijing), the bearing temperature is-30 ℃ to 100 ℃, the working pressure bearing pressure is 70MPa at maximum, the surface is subjected to phosphating treatment, the corrosion resistance is enhanced, the spraying speed can reach 250m/s, and the coal rock can be efficiently impacted and broken;
(3) Injecting high-temperature water with the temperature of more than or equal to 374.3 ℃ into the coiled tubing from the ground, injecting the high-temperature water into the tubing, wherein an annulus is in a closed state in the process, controlling the bottom hole pressure and simultaneously playing a role in heat preservation;
(4) The pressure in the continuous oil pipe and the pressure at the bottom of the well are controlled at 22.1MPa, high-temperature and high-speed supercritical water jet is sprayed at the bottom of the well, the characteristics of high temperature and high pressure, homogeneous oxidization and the like of supercritical water are utilized to continuously react with coal while the coal is crushed, a large amount of heat is released in the reaction process, the smooth proceeding of the subsequent reaction is maintained, the coal chemical energy is converted into hydrogen energy in the whole process, the combustible gas is obtained, and a gasification cavity is formed;
(5) After the gasification cavity is formed, the synchronous reforming effect of pressure relief and permeability increase can be achieved on the coal bed around the reformed cavity during reaction, and the gas yield is increased. After a first gasification cavity is smoothly transformed, dragging the continuous oil pipe to the next position, transforming the point spacing to 20m, determining a plurality of transformation points by adopting a geometric dividing method, dragging a spray gun by using the continuous oil pipe, and repeating the steps (3) and (4), thereby forming a plurality of gasification cavities;
(6) Discharging the combustible gas (gas-water mixture) from the ground through the annulus, and recovering H after gas-water separation on the ground 2 ；
(7) Separating the ground from the obtained CO 2 Gasification chamber with byproduct reinjection into the groundThe gasification chamber is used for trapping and utilizing again.
Fig. 1 is a schematic diagram of a coal underground gasification method of coiled tubing dragging type supercritical water injection coal rock according to embodiment 1 of the present invention. The dragging type continuous oil pipe can realize fixed-point, directional and multiple hydraulic jetting, can be combined with monitoring technologies such as temperature, pressure and the like to realize dynamic combustion monitoring, and reasonably selects the cavity-building times according to site construction conditions, construction requirements, reservoir conditions and the like.
Claims (10)
1. A continuous oil pipe dragging type supercritical water injection coal rock underground gasification method comprises the following steps:
step 1: injecting water with the temperature of 374.3 ℃ or higher into a coal bed through a draggable continuous oil pipe, controlling the pressure in the continuous oil pipe and the pressure at the bottom of the well to be 22.1MPa or higher, injecting high-temperature and high-speed supercritical water jet to break up coal and rock, enabling supercritical water to react with coal to obtain combustible gas, and forming a gasification cavity;
step 2: after forming the gasification cavity, dragging the draggable continuous oil pipe to the next position, and repeating the jet flow process to form another gasification cavity;
step 3: discharging the combustible gas to the ground and recovering H by gas-water separation 2 。
2. The method of claim 1, wherein the step of ejecting a high temperature, high velocity supercritical water jet to break up coal rock is accomplished by a lance tool;
preferably, the lance tool is a cavitation lance in CN114607278B or CN 111395964B.
3. The method of claim 1, wherein the reaction of supercritical water with coal comprises:
coal + supercritical water → CO 2 +H 2 +CH 4 ；
CO 2 +coal→co;
organic matter +O 2 →CO 2 +H 2 O。
4. A method according to claim 1 or 3, wherein the method further comprises capturing and/or separating CO at the surface 2 And injecting the coal bed into the gasification cavity.
5. The method according to claim 1 or 4, wherein CO is captured and/or separated in the gasification chamber 2 Reacts with carbon in the coal bed at high temperature to generate CO, and the CO further reacts with water vapor to generate H 2 And CO 2 And obtaining the combustible gas.
6. The method according to claim 1 or 4, wherein the main component of the combustible gas is CH 4 、H 2 、CO。
7. The method according to claim 1 or 4, wherein the method comprises the steps of: CO obtained by separating gas from water 2 And injecting the mixture into a gasification cavity of the coal bed to participate in the reaction in the gasification cavity.
8. The method of claim 1, wherein the method further comprises the steps of: and drilling the horizontal well into the coal seam, wherein the distances between the horizontal well and the top plate and the bottom plate of the coal seam are respectively more than or equal to 1m.
9. The method of claim 1, wherein step 2 is repeated and the number of times the gasification chamber is formed is adjusted according to the actual formation conditions until the entire coal seam is fully utilized.
10. The method according to any one of claims 1-9, comprising the specific steps of:
(1) Drilling a horizontal well to a target coal seam, wherein the distances between the horizontal well and a top plate and a bottom plate of the coal seam are respectively more than or equal to 1m;
(2) A continuous oil pipe provided with a spray gun tool is put into a coal bed;
(3) Injecting high-temperature water with the temperature of more than 374.3 ℃ into the coiled tubing from the ground;
(4) Controlling the pressure in the coiled tubing and the pressure at the bottom of the well to be more than 22.1MPa, spraying high-temperature and high-speed supercritical water jet at the bottom of the well to break coal and rock at the bottom of the well, enabling supercritical water to react with coal to obtain combustible gas, and forming a gasification cavity;
(5) After forming the gasification cavity, dragging the continuous oil pipe to the next position, and repeating the steps (3) and (4), thereby forming a plurality of gasification cavities;
(6) The combustible gas is discharged out of the ground through an annulus, and H is recovered after gas-water separation on the ground 2 ；
(7) Separating the ground from the obtained CO 2 The byproducts are re-injected into the underground gasification cavity to participate in the reaction in the gasification cavity.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117823112A (en) * | 2024-03-06 | 2024-04-05 | 太原理工大学 | In-situ coal supercritical water gasification hydrogen production different-layer mining method and device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117823112A (en) * | 2024-03-06 | 2024-04-05 | 太原理工大学 | In-situ coal supercritical water gasification hydrogen production different-layer mining method and device |
| CN117823112B (en) * | 2024-03-06 | 2024-04-30 | 太原理工大学 | In-situ coal supercritical water gasification hydrogen production different-layer mining method and device |
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