CN116575900B - In-situ coal partition controllable gasification hydrogen production and CO 2 Sealing and storing integrated method - Google Patents
In-situ coal partition controllable gasification hydrogen production and CO 2 Sealing and storing integrated method Download PDFInfo
- Publication number
- CN116575900B CN116575900B CN202310829606.5A CN202310829606A CN116575900B CN 116575900 B CN116575900 B CN 116575900B CN 202310829606 A CN202310829606 A CN 202310829606A CN 116575900 B CN116575900 B CN 116575900B
- Authority
- CN
- China
- Prior art keywords
- coal
- gasification
- sealing
- well
- pillar
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000003245 coal Substances 0.000 title claims abstract description 255
- 238000002309 gasification Methods 0.000 title claims abstract description 128
- 238000007789 sealing Methods 0.000 title claims abstract description 93
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 70
- 238000000034 method Methods 0.000 title claims abstract description 45
- 239000001257 hydrogen Substances 0.000 title claims abstract description 31
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 31
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 30
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 29
- 238000005192 partition Methods 0.000 title claims abstract description 17
- 238000002347 injection Methods 0.000 claims abstract description 54
- 239000007924 injection Substances 0.000 claims abstract description 54
- 238000005553 drilling Methods 0.000 claims abstract description 37
- 238000003860 storage Methods 0.000 claims abstract description 8
- 238000000638 solvent extraction Methods 0.000 claims abstract description 4
- 230000035699 permeability Effects 0.000 claims description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 27
- 230000001965 increasing effect Effects 0.000 claims description 17
- 238000006243 chemical reaction Methods 0.000 claims description 15
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 12
- 239000001301 oxygen Substances 0.000 claims description 12
- 229910052760 oxygen Inorganic materials 0.000 claims description 12
- 230000015572 biosynthetic process Effects 0.000 claims description 11
- 238000002485 combustion reaction Methods 0.000 claims description 9
- 230000000903 blocking effect Effects 0.000 claims description 8
- 238000002955 isolation Methods 0.000 claims description 8
- 239000012530 fluid Substances 0.000 claims description 7
- 238000006479 redox reaction Methods 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 6
- 239000011435 rock Substances 0.000 claims description 6
- 241000486463 Eugraphe sigma Species 0.000 claims description 4
- 239000002352 surface water Substances 0.000 claims description 4
- 230000001133 acceleration Effects 0.000 claims description 3
- 230000005484 gravity Effects 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 230000003204 osmotic effect Effects 0.000 claims description 3
- 230000009466 transformation Effects 0.000 claims description 3
- 230000002708 enhancing effect Effects 0.000 claims description 2
- 230000009919 sequestration Effects 0.000 abstract description 14
- 230000008569 process Effects 0.000 abstract description 6
- 238000005755 formation reaction Methods 0.000 description 8
- 230000007797 corrosion Effects 0.000 description 5
- 238000005260 corrosion Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 238000006722 reduction reaction Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 238000009834 vaporization Methods 0.000 description 3
- 230000008016 vaporization Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000009933 burial Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 150000002431 hydrogen Chemical class 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 239000003570 air Substances 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 238000010960 commercial process Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000037361 pathway Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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 DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/16—Modification of mine passages or chambers for storage purposes, especially for liquids or gases
Abstract
The invention discloses an in-situ coal partition controllable gasification hydrogen production and CO 2 Sealing and storing integrated method, which belongs to drilling exploitation and CO 2 The technical field of geological storage; the method comprises the steps of selecting in-situ coal gasification to produce hydrogen and sealing CO 2 Is a position of (2); constructing an injection well and a production well, wherein the injection well is communicated with the production well through a plurality of horizontal wells with intervals; partitioning between multiple horizontal wells to divide the coal seam into multiple COs 2 A sealing area; CO 2 The periphery boundary of the sealing and storing area is an isolated coal pillar; and then each CO 2 The sealing and storing area is divided into a plurality of gasification areas, and hydraulic fracturing is carried out in each gasification area one by one; the coal bodies in each gasification zone are gasified in turn, and CO is gradually formed in the gasification process 2 Sealing and storing the geologic body; after gasification in CO 2 Sequestration of geological CO 2 Sealing and storing; the invention realizes the energy utilization and the production H of deep non-acquirable coal 2 At the same time realize large-scale CO sealing 2 Solving the problem of CO in coal beds 2 Poor injectability, CO 2 The problem of reduced sealing capacity.
Description
Technical Field
The invention belongs to drilling exploitation and CO 2 The technical field of geological sequestration relates to an in-situ coal partition controllable gasification hydrogen production and cavity-making sequestration CO 2 An integrated method.
Background
CO 2 Geological sequestration is currently internationally recognized hopefully for achieving CO 2 An emission reduction geological treatment method with great potential. Currently, CO 2 The main target geologic body comprises deep salty water layer, oil-gas field under exploitation or exhaustion, deep non-recoverable coal layer, and brown water layerMartial arts, and the like. Compared with other geologic bodies, due to CO 2 Methane (CH) which is injected into coal seam and can displace 4 ) Collect greenhouse gas emission reduction and energy development into a whole, so that CO 2 The coal seam sealing has better economy. However, the permeability of coal beds in coal fields in China is generally low, and the permeability is reduced along with the increase of the burial depth or the ground stress; CH (CH) 4 The pressure increases with the depth of burial of the coal seam, resulting in CO 2 Reduced diffusion rate, CO 2 The amount of sealing is reduced. And CO 2 Injection into the coal seam also causes the coal seam to expand in volume, causing the permeability of the coal seam to decay dramatically.
Currently, deep non-shearable formations are mostly fractured (including hydraulic and supercritical CO 2 Nitrogen foam, etc.) increases coal seam permeability, but in deep formations, earth stress, CO 2 Under the influence of the volume expansion of the coal bed caused by long-term injection, the artificial fracture is gradually closed, so that the permeability is reduced again, and the CO of the coal bed is severely restricted 2 Injectability and coal seam sequestration of CO 2 Is a commercial process of (a).
Underground coal gasification is an important means for changing deep non-coal-mining layer resources into recoverable resources, but due to the influence of coal seam geology, incomplete combustion of organic matters pollutes an aquifer, and the reasons that the area of a combustion cavity is not easy to control, surrounding rock is collapsed, the aquifer leaks water, a combustion surface is destroyed, and the like, the underground coal gasification fails.
Disclosure of Invention
The invention overcomes the defects of the prior art and provides the in-situ coal partition controllable gasification hydrogen production and CO 2 Sealing and storing integrated method to realize energy utilization and production H of deep non-acquirable coal 2 Simultaneously, the artificial reconstruction of the geologic body is utilized to seal CO in a large scale 2 Realize clean energy production and carbon negative emission reduction integration. Solving the problem of CO in coal seam 2 Poor injectability, CO 2 The problem of reduced sealing capacity.
In order to achieve the above purpose, the present invention is realized by the following technical scheme.
In-situ coal partition controllable gasification hydrogen production and CO 2 The sealing and storing integrated method comprisesThe method comprises the following steps:
1) Determining hydrogen production and CO sealing for in-situ coal gasification 2 Is defined by the position of: selecting a coal-containing zone with depth more than 1500m or ground stress more than 37.5 MPa;
2) Constructing an injection well and a production well, and constructing a plurality of horizontal wells with intervals between the injection well and the production well, wherein the injection well is communicated with the production well through the horizontal wells; partitioning between multiple horizontal wells to divide the coal seam into multiple COs 2 A sealing area; CO 2 The periphery boundary of the sealing and storing area is an isolated coal pillar; the width of the isolated coal pillar is determined according to the bearing capacity of the isolated coal pillar, so that the bearing capacity of the isolated coal pillar is larger than the maximum load born by the isolated coal pillar;
3) Each CO 2 The sealing and storing area is divided into a plurality of gasification areas, and hydraulic fracturing is carried out in each gasification area one by one; the long side size of the gasification zone is 2 times of the interval between horizontal wells; short side size = hydraulic fracturing section spacing x number of hydraulic fracturing sections within the gasification zone;
4) Sequentially carrying out gasification reaction on the coal bodies in each gasification zone to obtain gasification products from the production well; transformation of low permeability coal into high permeability, high porosity CO during gasification 2 Sealing and storing the geologic body;
5) After gasification is finished, introducing supercritical CO into an injection well 2 Store it in each CO 2 And sealing the storage area and then sealing holes.
Preferably, the method is used for in-situ coal gasification hydrogen production and CO sealing 2 Is selected from the group consisting of: a heat-resistant trap formation existing between the target coal seam and the main aquifer; the heat-resistant trap stratum is positioned in the roof of the coal seam, and the distance between the heat-resistant trap stratum and the coal seam is more than or equal to 5 times the thickness of the coal seam;
equivalent permeability of the heat-resistant trap stratum at 300 DEG Ck eq ≤0.05×10 -3 μm 2 And equivalent permeability at 800 DEG Ck eq ≤1.2×10 -3 μm 2 The method comprises the steps of carrying out a first treatment on the surface of the Equivalent permeability coefficientK eq The expression is:
wherein ,K eq is equivalent osmotic coefficient;H i is the firstiThe thickness of the layer formation;K i is the firstiPermeability coefficient of the layer formation;iand taking the value of the number of the stratum within the range of not less than 100m according to the thickness of the coal seam 5-30 times above the coal seam roof, and taking the value as a positive integer. Equivalent permeability coefficientK eq And permeability ofk eq The relation of (2) is:
where ρ is the fluid density, g is the gravitational acceleration, μ is the hydrodynamic viscosity.
Preferably, when used for in situ coal gasification hydrogen production and CO sequestration 2 The ground stress conditions of the position of (2) are: vertical stress sigma v Greater than horizontal maximum principal stress sigma H I.e. sigma v ＞σ H； or σH ＞σ v ＞σ h ，σ h The horizontal minimum main stress is adopted, and at the moment, an injection well, a production well and a horizontal well are arranged in a U-shaped spindle type directional long drilling mode;
the U-shaped spindle type directional long drilling hole consists of an injection well, a production well and 3n horizontal wells with intervals, wherein n is more than or equal to 2 and is a positive integer; one end of the plurality of horizontal wells is connected with the bottom of the injection well, and the other end of the plurality of horizontal wells is connected with the bottom of the production well.
More preferably, the distance between two adjacent horizontal wells is determined according to the width of the corresponding isolated coal pillar or the propagation distance of the hydraulic fracture; the spacing for both the 3n and 3n-1 horizontal wells is 2 times the hydraulic fracture propagation distance; for the 3n-2 and 3n-3 horizontal wells, the spacing is the width of the isolated coal pillar.
Preferably, the isolating coal pillar comprises a coal pillar in the y direction and a coal pillar in the x direction, the width of the isolating coal pillar is a, and the load P of the born overburden layer is as follows:
wherein, gamma is the average gravity of the overlying strata; a is the width of the isolated coal pillar; b is the size perpendicular to the gasification zone of the isolated coal column; h is the depth of the coal seam; θ is the overburden collapse angle; l is the length of the coal pillar;
isolation coal pillar with width of a and maximum load P capable of bearing max The method comprises the following steps:
wherein c is the cohesive force of the coal pillar, phi is the internal friction angle of the coal pillar, and m is the thickness of the coal seam;
when P is less than P max When the coal pillar is separated, the coal pillar is kept stable; otherwise, increasing the width of the coal pillar and enhancing the compressive bearing capacity of the coal pillar; and calculates the lower limit of the width of the isolated coal pillar.
Preferably, in a gasification zone, plugging, perforating and hydraulic fracturing operations are finished in the horizontal wells at the two sides of the gasification zone after plugging, perforating and hydraulic fracturing are finished in the horizontal wells in the middle of the gasification zone; so that the hydraulic fractures of each horizontal well in the gasification zone are in complete communication.
Preferably, if the horizontal well is disposed in the coal seam, the perforation direction is perpendicular to the minimum principal stress and parallel to the horizontal maximum principal stress, and the shots are fired toward the adjacent horizontal well; if the horizontal well is arranged in the top or bottom of the coal seam, the perforation direction is perpendicular to the coal-rock interface, and the shot is launched into the coal seam.
Preferably, oxygen is introduced into the injection well, the coal body in the gasification zone is ignited, and supercritical water is introduced when the combustion temperature reaches more than 374 ℃; and sequentially gasifying the coal bodies in each gasification zone to obtain gasification products from the production well.
Preferably, temporary blocking valves are respectively arranged on the horizontal wells of the gasification areas and the isolation coal pillars; regulating the horizontal well within the range of each gasification zone and isolating temporary blocking valves in coal pillars, and introducing oxygen into the injection well to form a complete airflow passage from the injection well, the gasification zone and the production wellThe method comprises the steps of carrying out a first treatment on the surface of the When the oxygen concentration in the production well is rapidly increased, an ignition device in the gasification zone is put in and ignited; when the coal bed burns and the temperature rises to above 374 ℃, surface water is heated to steam and is introduced into an injection well, and then the pressure is increased to above 22.1MPa, so that the water becomes a supercritical state; carrying out oxidation-reduction reaction on the coal in the gasification zone, and collecting products in a production well; interval injection of O 2 Repeating the steps of coal combustion heating and oxidation reduction reaction with supercritical water until the porosity of the coal body in the gasification zone is increased to less than or equal to 40% to form CO 2 And a sealing area.
Preferably, after the gasification reaction of the coal in the coal-containing area is finished, the surface CO 2 Through the injection well, gradually pressurizing to above 7.3MPa to make CO 2 Becomes a supercritical state; temporary blocking valves in an isolated coal pillar are regulated to be filled with CO in sequence 2 And a sealing area.
Compared with the prior art, the invention has the following beneficial effects:
the invention utilizes supercritical water (SCW) to gasify deep non-acquirable in-situ coal to prepare hydrogen, and utilizes a high-porosity cavity generated by gasification reaction to increase CO 2 The injectability and the sealing capacity not only realize the energy utilization production H of deep non-recoverable coal 2 Can also utilize artificial transformation geologic body to seal CO in large scale 2 Realize clean energy production and carbon negative emission reduction integration.
According to the relation between the coal bed and the main aquifer, the invention selects in-situ coal supercritical water gasification hydrogen production and cavity preparation and CO sealing 2 Is used for the subsequent drilling, partitioning, exploitation and sealing, and ensures the CO 2 Is effectively sealed.
The invention sets the sealing area under the premise of setting the sealing area in CO 2 The periphery boundary of the sealing area is provided with an isolation coal pillar, the width of the isolation coal pillar is determined by the load of the overlying strata, the compression bearing capacity of the coal pillar is enhanced, and the CO is ensured 2 Environmental stability during the bulk of the sequestration process.
The invention divides a plurality of COs 2 Sealing the storage area, and then at CO 2 On the basis of the sealing area, a plurality of gasification areas are divided into areasSpecific gasification and sealing can prevent CO 2 The non-uniformity of the sealing in the coal seam can be controlled and monitored in a partitioned manner, so that the gasified coal seam can be effectively and fully utilized, and the CO is improved 2 Is a sealing amount of (a).
Drawings
Figure 1 is a perspective view of a U-spindle well according to the present invention.
FIG. 2 is a schematic diagram of a system including U-spindle drilling, coal pillar isolation, and CO 2 A partial plan view of the seal-up area.
FIG. 3 is CO 2 Local plane distribution diagrams of the sealing area and the gasification area.
FIG. 4 is a schematic diagram showing the flow direction of supercritical water and gasification reaction produced fluid in a horizontal drilling and gasification zone.
FIG. 5 is a schematic diagram showing the flow direction of supercritical water and gasification reaction produced fluid in a horizontal drilling and gasification zone.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the invention is further described in detail by combining the embodiments and the drawings. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. The following describes the technical scheme of the present invention in detail with reference to examples and drawings, but the scope of protection is not limited thereto.
Referring to FIGS. 1-4, the embodiment provides an in-situ coal supercritical water partition controllable gasification hydrogen production and cavity-making CO sealing method 2 The integrated method is to utilize supercritical water (SCW) to gasify deep non-acquirable in-situ coal to prepare hydrogen by gasification, and then utilize high-porosity cavity generated by gasification reaction to produce CO 2 And (5) sealing and storing. The method comprises the following five steps:
step one: in-situ coal supercritical water gasification hydrogen production and cavity preparation and CO sealing 2 Is the position of (2)
In-situ coal supercritical water gasification hydrogen production and cavity preparation and CO sealing 2 The region of (2) is a coal-containing region having a depth of 1500m or less or having a ground stress of 37.5MPa or more.
On the basis of satisfying the above conditions, a "heat-resistant trap formation" existing between the target coal seam and the main aquifer may be preferable. The heat-resistant trap stratum is characterized in that:
(a) The distance between the two layers is not less than 5 times of the thickness of the coal bed;
(b) Equivalent permeability of "heat resistant trap" at 300 °ck eq Not more than 0.05X10 -3 μm 2 And equivalent permeability at 800 DEG Ck eq Not more than 1.2X10 -3 μm 2 . Equivalent permeability coefficientK eq The expression is:
wherein ,K eq is equivalent osmotic coefficient;H i is the firstiThe thickness of the layer formation;K i is the firstiPermeability coefficient of the layer formation;iand taking the value of the number of the stratum within the range of not less than 100m according to the thickness of the coal seam 5-30 times above the coal seam roof, and taking the value as a positive integer. Equivalent permeability coefficientK eq And permeability ofk eq The relation of (2) is:
where ρ is the fluid density, g is the gravitational acceleration, μ is the hydrodynamic viscosity.
Step two: constructing U-shaped spindle type directional long drilling holes to divide a coal seam into a plurality of CO 2 Sealing area
1. Engineering geological conditions for selecting the construction of the U-shaped-spindle directional long drilling hole are as follows:
(a) When the local ground stress condition is: vertical stress sigma v Greater than horizontal maximum principal stress sigma H (i.e. sigma) v ＞σ H ) The method comprises the steps of carrying out a first treatment on the surface of the Or have sigma H ＞σ v ＞σ h (σ h For horizontal minimum principal stress), in which case a U-spindle-shaped setting is preferredDrilling holes to the long sides.
(b) When the local ground stress condition is: the principal stress in the horizontal direction is not less than the vertical stress, i.e. sigma H Or sigma h ≥σ v A conventional vertical well plan is selected.
The adoption of the U-shaped spindle type directional long drilling hole can be matched with a plurality of horizontal wells only by drilling one injection well 1 and one production well 2, so that the number of the plurality of injection wells and the number of the production wells in the traditional drilling mode are greatly reduced.
2. The U-shaped spindle type directional long drilling hole consists of an injection well 1, a production well 2 and 3n (n is more than or equal to 2 and is a positive integer) horizontal wells with certain intervals. One end of the plurality of horizontal wells is connected with the bottom of the injection well 1, and the other end of the plurality of horizontal wells is connected with the bottom of the production well 2. The interval between the injection well 1 and the production well 2 is preferably 500 to 5000 mm, and the injection well is U-shaped in cross section or elevation. The injection well 1 is used for injecting supercritical water and oxygen or air; the production well 2 is hydrogen, CO and CH 4 、CO 2 Etc. producing wells.
3. The top view of all horizontal wells is in the form of spindles. A plurality of horizontal wells may be disposed within the coal seam or may be disposed in a roof or floor of the coal seam. When the mechanical strength of the coal bed is high and the horizontal well is stable and does not collapse, the arrangement scheme in the coal bed is optimized; otherwise, a top or bottom plate arrangement is employed.
4. The distance between two adjacent horizontal wells is determined according to the width of the isolated coal pillar or the hydraulic fracture propagation distance obtained by field test. For the 3 n-th and 3n-1 th horizontal wells, the distance between the two horizontal wells is 2 times of the hydraulic fracture propagation distance; for the 3n-2 and 3n-3 horizontal wells, the spacing is the width of the isolated coal pillar.
In this embodiment, as shown in fig. 1, the horizontal well has 9 drilling holes, namely, a first drilling hole 301, a second drilling hole 302, a third drilling hole 303, a fourth drilling hole 304, a fifth drilling hole 305, a sixth drilling hole 306, a seventh drilling hole 307, an eighth drilling hole 308, and a ninth drilling hole 309,9, one end of which is connected to the injection well 1, and the other end of which is connected to the production well 2, so as to form a U-shaped spindle directional long drilling hole. The upper coal seam area in fig. 1 is a coal seam 4, and the lower part of the coal seam 4 is a coal seam 5.
5、CO 2 The sealing areas are arranged between the drilling holes, CO 2 The periphery boundary of the sealing area is an isolated coal pillar, wherein CO 2 The size of the sequestration zone and the isolated coal pillar is determined as follows:
(a) Isolating coal pillar: the method comprises the steps of including a coal pillar in the y direction and a coal pillar in the x direction, wherein the width of an isolated coal pillar is determined according to the bearing capacity:
the width of the isolated coal pillar is a, and the load P of the born overburden layer is as follows:
wherein, gamma is the average gravity of the overlying strata; a is the width of the isolated coal pillar; b is the size perpendicular to the gasification zone of the isolated coal column; h is the depth of the coal seam; θ is the overburden collapse angle; l is the length of the coal pillar.
Isolation coal pillar with width of a and maximum load P capable of bearing max The method comprises the following steps:
wherein c is the cohesive force of the coal pillar, phi is the internal friction angle of the coal pillar, and m is the thickness of the coal seam.
When P is less than P max When the isolated coal pillar is stable. Otherwise, the width of the coal pillar is increased, so that the compressive bearing capacity of the coal pillar is enhanced. And reversely calculating the lower limit of the width of the isolated coal pillar by the formula.
In this embodiment, the value γ=25000N/m 3 A is 120m, b is 100m, H is 1500m, θ is 70 °, and L is 100m, if P= 897725186035N
c is 5×10 6 Pa, phi takes the value of 30 °, and m takes the value of 5m, pmax= 1078808422108N. Namely, when the width of the coal pillar is 120m, the bearing capacity requirement can be met.
(b) On the basis of ensuring the stability of the isolated coal pillar, CO 2 Short side dimension of the containment zone, i.e. CO 2 The dimension of the sealing area in the y direction is 2 times of the horizontal well spacing, or the sealing area is on site4 times of the propagation distance of the hydraulic fracture obtained by the test;
（c）CO 2 the long side dimension of the containment zone, i.e. CO 2 The size of the sealing area in the x direction is determined according to the size and number of the gasification areas divided in the sealing area and comprehensively considers CO 2 The amount of scheduled sealing in the sealing area.
(c) Binding CO 2 Determining CO in the axial direction of the drill hole as a result of the short side dimension d of the containment zone and the length of the directional long drill hole 2 Number of seal-up areas.
CO in the present embodiment 2 The sealing areas are divided into 6, as shown in FIG. 2, and are respectively the first CO indicated by the dashed line boxes in the figure 2 A sequestration zone 601, a second CO 2 A sequestration zone 602, a third CO 2 The sequestration area 603, fourth CO 2 The sequestration zone 604, fifth CO 2 Seal zone 605, sixth CO 2 And a save area 606.
CO 2 The isolated coal pillars in the y direction of the sealing area are respectively: first isolated coal column 701, second isolated coal column 702, third isolated coal column 703, fourth isolated coal column 704, fifth isolated coal column 705, sixth isolated coal column 706, seventh isolated coal column 707, eighth isolated coal column 708, and ninth isolated coal column 709.
CO 2 The isolated coal pillars in the x direction of the sealing area are respectively: a first laterally isolated coal pillar 801 and a second laterally isolated coal pillar 802.
Step three, each CO 2 The sealing area is divided into a plurality of gasification areas, and hydraulic fracturing is performed in the gasification areas. The method comprises the following steps:
1. each CO 2 The sealing area is divided into a plurality of gasification areas: the size of the long side (i.e. y direction) of the gasification zone is 2 times of the horizontal drilling interval; short side dimension = hydraulic fracturing section spacing x number of hydraulic fracturing sections within the gasification zone. The hydraulic fracturing segment spacing is determined according to the stress shadow range actual measurement result when adjacent hydraulic fractures propagate.
In this embodiment, a CO 2 The sealing and storing area is divided into two gasification areas, and 12 gasification areas, namely a fracturing section, are formed in a conformal manner; as shown in FIG. 3, a first CO 2 The storage area 601 is divided into the firstA fracturing section 901 and a second fracturing section 902.
2. Directional perforation in each fracture zone: if the horizontal well is arranged in the coal seam, the perforation direction is perpendicular to the minimum principal stress and parallel to the horizontal maximum principal stress, and the shots are launched towards the adjacent horizontal well; if the horizontal well is arranged in the top or bottom of the coal seam, the perforation direction is perpendicular to the coal-rock interface, and the shot is launched into the coal seam.
The perforation process is as follows:
(a) Plugging: firstly, in a second drilling hole 302, plugging two ends of a first fracturing section 901 of a horizontal well formed by the second drilling hole 302 by adopting a third temporary plugging valve 1103 and a fourth temporary plugging valve 1104 which can be repeatedly opened and closed and are high-temperature resistant and corrosion resistant;
(b) Perforation direction: if the horizontal well formed by the first borehole 301, the second borehole 302, and the third borehole 303 is in the coal seam, the direction of the directional perforation is: the perforation direction is perpendicular to the minimum principal stress and parallel to the horizontal maximum principal stress, and the horizontal well shots formed by the second borehole 302 are fired toward two adjacent horizontal wells, namely the first borehole 301 and the second borehole 302.
If the horizontal wells formed by the first borehole 301, the second borehole 302, and the third borehole 303 are in the top-bottom rock layer, the direction of the directional perforation is perpendicular to the coal-rock interface, and the shot is launched towards the coal seam.
3. For CO 2 Each fracturing section in the sealing area sequentially develops large-displacement hydraulic fracturing, wherein the large-displacement hydraulic fracturing is performed at a liquid injection rate of not less than 3m 3 And/min, thereby producing a complex slotted mesh in each gasification zone. The contact area of the coal body and SCW is increased after the volume fracturing, so that the reaction efficiency is greatly increased.
The method specifically comprises the following steps:
(a) After the plugging, perforating and large-displacement hydraulic fracturing are completed in the first fracturing segment 901 of the second drilling hole 302, the plugging, perforating and fracturing operations are repeatedly completed in the first fracturing segment 901 of the first drilling hole 301 and the first fracturing segment 901 of the third drilling hole 303. So that the hydraulic fractures of the first borehole 301 and the third borehole 303 are fully in communication with the hydraulic fractures of the second borehole 302. Thereby forming a first CO 2 A first vaporization region within the sequestration region 601.
(b) Repeating step (a) to form a first CO 2 A second vaporization region in the sequestration region 601, and the remaining individual vaporization regions.
As shown in FIG. 3, in the figure, with a first CO 2 The sealing area 601 is taken as an example, and 9 high-temperature-resistant corrosion-resistant temporary plugging valves arranged on each fracturing section of the horizontal well are respectively as follows: a first temporary plugging valve 1101, a second temporary plugging valve 1102, a third temporary plugging valve 1103, a fourth temporary plugging valve 1104, a fifth temporary plugging valve 1105, a sixth temporary plugging valve 1106, a seventh temporary plugging valve 1107, an eighth temporary plugging valve 1108, and a ninth temporary plugging valve 1109;
CO 2 the 6 high-temperature-resistant corrosion-resistant temporary plugging valves arranged in the isolation coal pillar of the sealing area are respectively as follows:
a temporary shutoff valve 101 located in the first isolated coal column 701 and in the first borehole 301;
a temporary shutoff valve 102 located in the first isolated coal column 701 and in the second borehole 302;
a temporary shutoff valve 103 located in the first isolated coal column 701 and in the third borehole 303;
a temporary block valve 104 located in the second isolated coal column 702 and in the first borehole 301;
a temporary block valve 105 located in a second isolated coal column 702 and in a second borehole 302;
a temporary block valve 106 located in the second isolated coal column 702 and in the third borehole 303;
as well as perforations 12 and hydraulic fracturing fractures 13.
Step four, introducing oxygen into the injection well 1, igniting the coal body in the gasification zone, and introducing SCW when the combustion temperature reaches above 374 ℃; gasifying the coal in each gasifying zone in turn to obtain H from the production well 2 2 、CH 4 、CO 2 And gasifying the product. Simultaneously, the low permeability coal bed is transformed into high permeability and high porosity CO 2 Sealing and storing the geologic body. The method comprises the following steps:
1. regulating the horizontal well within the range of each gasification zone and the high-temperature-resistant corrosion-resistant temporary blocking valve in the isolating coal pillar, and introducing oxygen into the injection well 1 to form the gas mixture from the injection well 1 and CO 2 First CO 2 First in the seal area 601A gasification zone (first fracturing section 901), a complete gas flow path for production well 2; when the oxygen concentration in the production well 2 increases rapidly, the ignition device in the first gasification zone (first fracturing section 901) is put in and ignited.
2. When the coal bed burns and the temperature rises to above 374 ℃, the surface water is heated to steam and is introduced into the injection well 1, and then the pressure is increased to above 22.1MPa, so that the water becomes a supercritical state. And carrying out oxidation-reduction reaction on the coal in the first gasification zone, and collecting H in the production well 2 2 、CH 4 、CO 2 And the like.
3. Obtained by indoor experiment 2 Based on the relation between SCW flow, temperature, gasification time and coal porosity, O is injected at intervals 2 Repeating the steps of burning coal, heating and oxidation-reduction reaction with SCW. Until the porosity of the coal body in the gasification zone is increased to not more than 40%. Thereby greatly increasing the permeability of the coal bed, simultaneously manufacturing a large number of micro pores and macroscopic cavity structures in the coal body to form a first CO 2 And a save area 601.
4. Repeating the above steps to form all CO 2 And a sealing area.
Referring to FIG. 4, the first CO in this embodiment 2 For example, the first gasification zone in the storage zone 601 is the specific process of the fourth step is:
(a) All temporary shut-off valves in the second borehole 302 are opened: a third temporary plugging valve 1103, a fourth temporary plugging valve 1104, an eighth temporary plugging valve 1108, and a temporary plugging valve 102 located in the first isolated coal column 701 and in the second borehole 302, and a temporary plugging valve 105 located in the second isolated coal column 702 and in the second borehole 302; a complete airflow path is created from the injection well 1 to the production well 2 while keeping the temporary shut-in valves of the other wells fully closed. And then at the first CO 2 Three ignition devices 14 are arranged in a first gasification zone (a first fracturing section 901) in the sealing and storing zone 601, surface oxygen is introduced into a coal seam through an injection well 1, and after the oxygen concentration in a production well 2 approaches the injection well 1, the three ignition devices 14 in the first gasification zone (the first fracturing section 901) are sequentially ignited. The temperature sensor is used for monitoring the temperature after coal combustion, and when the temperature is increased to be more than 374 ℃, the surface water is heatedSteam is introduced into the injection well 1 and pressurized to 22.1MPa or more, so that water becomes a supercritical state.
(b) The third temporary plugging valve 1103 (keeping the fourth temporary plugging valve 1104 open) of the second borehole 302 in the first gasification zone (first fracturing section 901) is closed and the first temporary plugging valve 1101, the fifth temporary plugging valve 1105 (keeping the second temporary plugging valve 1102, the sixth temporary plugging valve 1106 closed) in the first borehole 301 and the third borehole 303 in the first gasification zone (first fracturing section 901) is opened. Supercritical water is caused to form the pathway of injection well 1, the first gasification zone (first fracture section 901), production well 2. The direction of the arrow in fig. 4 is the flow direction 15 of supercritical water and produced fluid.
(c) In the first gasification zone (first fracturing section 901), hydrogen in the extremely strong oxidant, namely supercritical water, is replaced by utilizing the reducibility of carbon in coal, so that H is generated 2 The method comprises the steps of carrying out a first treatment on the surface of the At the same time, the solid organic matters in the coal body are oxidized into gaseous CO and CH 4 、CO 2 Etc. The contact area of supercritical water and coal is increased by utilizing a complex seam net structure, so that H is further increased 2 Yield and production efficiency.
(d) After the gasification reaction of the coal in the first gasification zone (the first fracturing section 901) is finished, the gasification reaction is carried out on the coal in the second gasification zone (the second fracturing section 902). At this time, the fourth temporary plugging valve 1104 in the second gasification zone (second fracturing section 902) is closed, the second temporary plugging valve 1102 and the sixth temporary plugging valve 1106 are opened, and supercritical water is allowed to form a passage of injection well 1, the second gasification zone (second fracturing section 902), production well 2, see fig. 5. The direction of the arrow in fig. 5 is the flow direction 15 of supercritical water and produced fluid.
(e) In the second gasification zone (second fracturing section 902), the gasification reaction is carried out and H generated by the reaction is carried out in the production well 2 、CO、CH 4 、CO 2 And pumping to the ground.
(f) Repeating the above steps until all CO 2 And (5) ending the reaction of the coal body in the gasification zone in the sealing zone. Thereby completing the manufacture of H by gasifying coal 2 A pore/cavity process in the coal.
Through the steps, the method is realIn-situ regional continuous in-situ coal supercritical water gasification H production 2 And manufacture of stored CO 2 And (3) a cavity process.
Step five, after gasification is finished, introducing supercritical CO into the injection well 2 Store it in each CO 2 And sealing the storage area and then sealing holes. Realizing long-term CO sealing in artificially transformed geologic body 2 。
1. After the gasification reaction of the coal in the target coal-containing zone is finished, the surface CO 2 CO is pumped through the injection well 1 and gradually pressurized to 7.3MPa or higher 2 Becomes a supercritical state. Temporary blocking valves in an isolated coal pillar are regulated to be filled with CO in sequence 2 And a sealing area.
The method comprises the following specific steps:
(a) At the first CO 2 In the shut-in zone 601, the temporary shut-in valves (first temporary shut-in valve 1101-ninth temporary shut-in valve 1109) of all fracturing zones in the well are opened. Opening a temporary plugging valve 101 located in a first isolated coal column 701 and located in a first borehole 301, a temporary plugging valve 103 located in the first isolated coal column 701 and located in a third borehole 303, and a temporary plugging valve 105 located in a second isolated coal column 702 and located in a second borehole 302; and closing the temporary plugging valve 102 located in the first isolated coal column 701 and in the second borehole 302, the temporary plugging valve 104 located in the second isolated coal column 702 and in the first borehole 301, and the temporary plugging valve 106 located in the second isolated coal column 702 and in the third borehole 303. CO in well to be produced 2 When the concentration increases rapidly, the temporary plugging valve 101 positioned in the first isolated coal pillar 701 and positioned in the first drilling hole 301, the temporary plugging valve 103 positioned in the first isolated coal pillar 701 and positioned in the third drilling hole 303, and the temporary plugging valve 105 positioned in the second isolated coal pillar 702 and positioned in the second drilling hole 302 are closed, and CO is continuously injected according to the preset pressure 2 . Stopping CO injection when wellhead pressure increases rapidly 2 . Thereby supercritical CO 2 Injection of first CO 2 Within the seal area 601.
(b) Repeating the above step by adjusting CO 2 Opening and closing temporary blocking valves in the isolating coal pillar in the y direction of the sealing and storing area, and sequentially carrying out CO (carbon monoxide) remaining 2 The sealing area is filled with CO 2 。
With high-strength, corrosion-resistant materialsPlugging the injection well 1 and the production well 2 to realize CO 2 And (5) long-term geological storage.
While the invention has been described in detail in connection with specific preferred embodiments thereof, it is not to be construed as limited thereto, but rather as a result of a simple deduction or substitution by a person having ordinary skill in the art to which the invention pertains without departing from the scope of the invention defined by the appended claims.
Claims (10)
1. In-situ coal partition controllable gasification hydrogen production and CO 2 The sealing and storing integrated method is characterized by comprising the following steps of:
1) Determining hydrogen production and CO sealing for in-situ coal gasification 2 Is defined by the position of: selecting a coal-containing zone with depth more than 1500m or ground stress more than 37.5 MPa;
2) Constructing an injection well (1) and a production well (2), and constructing a plurality of horizontal wells with intervals between the injection well (1) and the production well (2), wherein the injection well (1) is communicated with the production well (2) through the horizontal wells; partitioning between multiple horizontal wells to divide the coal seam into multiple COs 2 A sealing area; CO 2 The periphery boundary of the sealing and storing area is an isolated coal pillar; the width of the isolated coal pillar is determined according to the bearing capacity of the isolated coal pillar, wherein the bearing capacity of the isolated coal pillar is smaller than the maximum load born by the isolated coal pillar;
3) Each CO 2 The sealing and storing area is divided into a plurality of gasification areas, and hydraulic fracturing is carried out in each gasification area one by one; the long side size of the gasification zone is 2 times of the interval between horizontal wells; short side size = hydraulic fracturing section spacing x number of hydraulic fracturing sections within the gasification zone;
4) Sequentially carrying out gasification reaction on coal bodies in each gasification zone, and obtaining gasification products from the production well (2); transformation of low permeability coal into high permeability, high porosity CO during gasification 2 Sealing and storing the geologic body;
5) After gasification is finished, introducing supercritical CO into an injection well 2 Store it in each CO 2 A sealing-up area for sealing up the storage area,and then sealing holes.
2. An in situ coal partition controllable gasification hydrogen and CO as claimed in claim 1 2 The sealing and storing integrated method is characterized in that the method is used for in-situ coal gasification hydrogen production and CO sealing and storing 2 Is selected from the group consisting of: a heat-resistant trap formation existing between the target coal seam and the main aquifer; the heat-resistant trap stratum is positioned in the roof of the coal seam, and the distance between the heat-resistant trap stratum and the coal seam is more than or equal to 5 times the thickness of the coal seam;
equivalent permeability of the heat-resistant trap stratum at 300 DEG Ck eq ≤0.05×10 -3 μm 2 And equivalent permeability at 800 DEG Ck eq ≤1.2×10 -3 μm 2 The method comprises the steps of carrying out a first treatment on the surface of the Equivalent permeability coefficientK eq The expression is:
wherein ,K eq is equivalent osmotic coefficient;H i is the firstiThe thickness of the layer formation;K i is the firstiPermeability coefficient of the layer formation;ithe value is a positive integer according to the number of stratum within the range of 5-30 times of the thickness of the coal seam above the coal seam roof and not less than 100 m; equivalent permeability coefficientK eq And equivalent permeability ofk eq The relation of (2) is:
where ρ is the fluid density, g is the gravitational acceleration, μ is the hydrodynamic viscosity.
3. An in situ coal partition controllable gasification hydrogen and CO as claimed in claim 1 2 The sealing and storing integrated method is characterized in that when the method is used for in-situ coal gasification hydrogen production and CO sealing and storing 2 The ground stress conditions of the position of (2) are: vertical stress sigma v Greater than waterFlat maximum principal stress sigma H I.e. sigma v ＞σ H； or σH ＞σ v ＞σ h ，σ h The horizontal minimum main stress is adopted, and at the moment, the injection well (1), the production well (2) and the horizontal well are arranged in a U-shaped spindle type directional long drilling mode;
the U-shaped spindle type directional long drilling hole consists of an injection well (1), a production well (2) and 3n horizontal wells with intervals, wherein n is more than or equal to 2 and is a positive integer; one end of the plurality of horizontal wells is connected with the bottom of the injection well (1), and the other end of the plurality of horizontal wells is connected with the bottom of the production well (2).
4. An in-situ coal partition controllable gasification hydrogen and CO as claimed in claim 3 2 The sealing and storing integrated method is characterized in that the distance between two adjacent horizontal wells is determined according to the width of a corresponding isolated coal pillar or the propagation distance of hydraulic cracks; the spacing for both the 3n and 3n-1 horizontal wells is 2 times the hydraulic fracture propagation distance; for the 3n-2 and 3n-3 horizontal wells, the spacing is the width of the isolated coal pillar.
5. An in situ coal partition controllable gasification hydrogen and CO as claimed in claim 1 2 The sealing and storing integrated method is characterized in that the isolating coal pillar comprises a coal pillar in the y direction and a coal pillar in the x direction, the width of the isolating coal pillar is a, and the load P of the born overlying strata is as follows:
wherein, gamma is the average gravity of the overlying strata; a is the width of the isolated coal pillar; b is the size perpendicular to the gasification zone of the isolated coal column; h is the depth of the coal seam; θ is the overburden collapse angle; l is the length of the coal pillar;
isolation coal pillar with width of a and maximum load P capable of bearing max The method comprises the following steps:
wherein c is the cohesive force of the coal pillar, phi is the internal friction angle of the coal pillar, and m is the thickness of the coal seam;
when P is less than P max When the coal pillar is separated, the coal pillar is kept stable; otherwise, increasing the width of the coal pillar and enhancing the compressive bearing capacity of the coal pillar; and calculates the lower limit of the width of the isolated coal pillar.
6. An in situ coal partition controllable gasification hydrogen and CO as claimed in claim 1 2 The sealing and storing integrated method is characterized in that in one gasification zone, sealing, perforating and hydraulic fracturing operations are finished in the horizontal wells at the two sides of the gasification zone after sealing, perforating and hydraulic fracturing are finished in the horizontal wells in the middle of the gasification zone; so that the hydraulic cracks of each horizontal well in the gasification zone are completely communicated.
7. The in-situ coal partition controllable gasification hydrogen production and CO according to claim 6 2 The sealing and storing integrated method is characterized in that if the horizontal well is arranged in the coal seam, the perforation direction is vertical to the minimum main stress and parallel to the horizontal maximum main stress, and the shots are launched towards the adjacent horizontal well; if the horizontal well is arranged in the top or bottom of the coal seam, the perforation direction is perpendicular to the coal-rock interface, and the shot is launched into the coal seam.
8. An in situ coal partition controllable gasification hydrogen and CO as claimed in claim 1 2 The sealing and storing integrated method is characterized in that oxygen is introduced into an injection well (1), coal bodies in a gasification area are ignited, and supercritical water is introduced when the combustion temperature reaches more than 374 ℃; and sequentially gasifying the coal bodies in each gasification zone to obtain gasification products from the production well (2).
9. The in-situ coal partition controllable gasification hydrogen production and CO according to claim 8 2 The sealing and storing integrated method is characterized in that temporary blocking valves are respectively arranged on the horizontal well of each gasification zone and the isolating coal pillar; regulating each gasification zoneIntroducing oxygen into the injection well (1) to form a complete airflow path from the injection well (1), the gasification zone and the production well (2); when the oxygen concentration in the production well (2) is rapidly increased, an ignition device in the gasification zone is put in and ignited; when the coal bed burns and the temperature rises to above 374 ℃, surface water is heated to steam and is introduced into an injection well (1), and then the pressure is increased to above 22.1MPa, so that the water becomes a supercritical state; carrying out oxidation-reduction reaction on the coal in the gasification zone, and collecting products in a production well (2); interval injection of O 2 Repeating the steps of coal combustion heating and oxidation reduction reaction with supercritical water until the porosity of the coal body in the gasification zone is increased to less than or equal to 40% to form CO 2 And a sealing area.
10. An in situ coal partition controllable gasification hydrogen and CO as claimed in claim 9 2 The sealing and storing integrated method is characterized in that after the gasification reaction of coal in the coal-containing area is finished, the surface CO is obtained 2 Through the injection well (1), and gradually pressurizing to above 7.3MPa, CO is produced 2 Becomes a supercritical state; temporary blocking valves in an isolated coal pillar are regulated to be filled with CO in sequence 2 And a sealing area.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310829606.5A CN116575900B (en) | 2023-07-07 | 2023-07-07 | In-situ coal partition controllable gasification hydrogen production and CO 2 Sealing and storing integrated method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310829606.5A CN116575900B (en) | 2023-07-07 | 2023-07-07 | In-situ coal partition controllable gasification hydrogen production and CO 2 Sealing and storing integrated method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116575900A CN116575900A (en) | 2023-08-11 |
| CN116575900B true CN116575900B (en) | 2023-09-15 |
Family
ID=87536145
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310829606.5A Active CN116575900B (en) | 2023-07-07 | 2023-07-07 | In-situ coal partition controllable gasification hydrogen production and CO 2 Sealing and storing integrated method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116575900B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117052366B (en) * | 2023-10-11 | 2023-12-22 | 太原理工大学 | Method for in-situ exploitation and energy efficient utilization of deep organic rock ore layer |
| CN117489319A (en) * | 2023-11-15 | 2024-02-02 | 中国矿业大学(北京) | Method for heat insulation and preservation of coal seam in-situ coal gasification process |
| 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 |
Citations (30)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101113670A (en) * | 2007-09-04 | 2008-01-30 | 新奥能源研究院有限公司 | Coal underground gasifying technology |
| CN101315026A (en) * | 2008-07-01 | 2008-12-03 | 李文军 | Underground coal gasification system and producing process |
| CN102418476A (en) * | 2011-10-24 | 2012-04-18 | 国鼎(大连)投资有限公司 | Deep coal and coal bed gas combined mining method |
| CN103670338A (en) * | 2012-09-21 | 2014-03-26 | 新奥气化采煤有限公司 | Method for extracting coalbed methane and coal together |
| CN104564011A (en) * | 2015-02-11 | 2015-04-29 | 新奥气化采煤有限公司 | Underground gasification method |
| CN104696005A (en) * | 2015-02-03 | 2015-06-10 | 太原理工大学 | Method for synchronously extracting residual coalbed methane and sealing and preserving carbon dioxide in old mined-out area of coal mine |
| CN105041290A (en) * | 2015-02-13 | 2015-11-11 | 新奥气化采煤有限公司 | Multilayer coal seam gasification furnace and coal seam gasification method |
| CN105525903A (en) * | 2015-08-10 | 2016-04-27 | 柴兆喜 | Upward gas injection coal roadway gasifier type gasification mine |
| CN205297520U (en) * | 2015-08-10 | 2016-06-08 | 柴兆喜 | Go up to gas injection coal road gasifier formula gasification mine |
| CN107091078A (en) * | 2017-06-15 | 2017-08-25 | 新疆国利衡清洁能源科技有限公司 | Underground coal gasification passage and its method |
| CN110552677A (en) * | 2019-09-05 | 2019-12-10 | 中国矿业大学(北京) | Mine type coal underground gasification furnace and gasification method |
| CN111173491A (en) * | 2020-03-09 | 2020-05-19 | 山东科技大学 | Pre-control structure of underground gasification furnace, gasification furnace and gasification method |
| CN112081558A (en) * | 2020-10-10 | 2020-12-15 | 西安科技大学 | Coal underground gasification and coalbed methane collaborative mining method, structure and construction method |
| CN112483062A (en) * | 2020-12-17 | 2021-03-12 | 西安科技大学 | Underground interlayer type coal in-situ gasification mining method and system |
| CN112483063A (en) * | 2020-12-17 | 2021-03-12 | 西安科技大学 | Underground interlayer type coal in-situ gasification mining system and construction method thereof |
| CN112878978A (en) * | 2021-01-29 | 2021-06-01 | 中国矿业大学 | Supercritical water fracturing synergistic hydrogen production method for underground coal gasification |
| WO2021109922A1 (en) * | 2019-12-03 | 2021-06-10 | 中国矿业大学 | Method for designing width of isolation coal pillar and gasifier in underground gasification under aquifer facing overlying strata |
| CN113653470A (en) * | 2021-10-21 | 2021-11-16 | 西南石油大学 | Coal bed in-situ hydrogen production and coal bed gas development integrated method and structure |
| CN113775376A (en) * | 2021-08-17 | 2021-12-10 | 西安科技大学 | In-situ pyrolysis and CO of oil-rich coal2Geological sealing and storing integrated method |
| CN114233265A (en) * | 2021-12-31 | 2022-03-25 | 西安交通大学 | Coal in-situ pyrolysis poly-generation and carbon dioxide sequestration system and method |
| CN114412433A (en) * | 2022-01-20 | 2022-04-29 | 中国矿业大学 | Deep coal in-situ fluidization mining method based on heat extraction power generation |
| CN114876438A (en) * | 2022-05-08 | 2022-08-09 | 太原理工大学 | Coal mining method for in-situ hydrogen production of filling coal |
| CN114876428A (en) * | 2022-04-27 | 2022-08-09 | 陕西省煤田地质集团有限公司 | Modularization and cascade development method for underground in-situ conversion of oil-rich coal |
| CN115075778A (en) * | 2021-03-11 | 2022-09-20 | 中国石油化工股份有限公司 | Coal bed gas/coal bed integrated recovery method and device, electronic equipment and medium |
| CN115559700A (en) * | 2022-10-25 | 2023-01-03 | 中国地质调查局水文地质环境地质调查中心 | With CO 2 Underground coal gasification method for high geothermal abnormal region by combining geological sequestration technology |
| CN115596426A (en) * | 2022-10-26 | 2023-01-13 | 中国石油化工股份有限公司（Cn） | double-L-shaped underground gasification well spacing method for deep coal |
| WO2023007467A2 (en) * | 2021-07-30 | 2023-02-02 | Ohio State Innovation Foundation | Systems and methods for generation of hydrogen by in-situ (subsurface) serpentinization and carbonization of mafic or ultramafic rock |
| CN115977603A (en) * | 2023-02-22 | 2023-04-18 | 大连理工大学 | Gas-water CO-injection CO based on multistage fracturing 2 Hydrate sealing cover layer generation system and regulation and control method |
| CN116066052A (en) * | 2023-03-07 | 2023-05-05 | 太原理工大学 | Method for carrying out post-side filling-in-situ gasification collaborative recovery of residual coal post in residual mining area |
| CN116066803A (en) * | 2023-01-10 | 2023-05-05 | 重庆大学 | Coal seam in-situ direct combustion energy taking system and method |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6969123B2 (en) * | 2001-10-24 | 2005-11-29 | Shell Oil Company | Upgrading and mining of coal |
| US20150292303A1 (en) * | 2009-03-11 | 2015-10-15 | Maurice B. Dusseault | Process for sequestration of fluids in geological formations |
| CN103437748B (en) * | 2013-09-04 | 2016-08-10 | 新奥气化采煤有限公司 | Coal underground gasifying furnace and coal underground gasification method |
| US20230016334A1 (en) * | 2021-07-13 | 2023-01-19 | Terracoh Inc. | Systems and methods for carbon dioxide sequestration injection |
-
2023
- 2023-07-07 CN CN202310829606.5A patent/CN116575900B/en active Active
Patent Citations (30)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101113670A (en) * | 2007-09-04 | 2008-01-30 | 新奥能源研究院有限公司 | Coal underground gasifying technology |
| CN101315026A (en) * | 2008-07-01 | 2008-12-03 | 李文军 | Underground coal gasification system and producing process |
| CN102418476A (en) * | 2011-10-24 | 2012-04-18 | 国鼎(大连)投资有限公司 | Deep coal and coal bed gas combined mining method |
| CN103670338A (en) * | 2012-09-21 | 2014-03-26 | 新奥气化采煤有限公司 | Method for extracting coalbed methane and coal together |
| CN104696005A (en) * | 2015-02-03 | 2015-06-10 | 太原理工大学 | Method for synchronously extracting residual coalbed methane and sealing and preserving carbon dioxide in old mined-out area of coal mine |
| CN104564011A (en) * | 2015-02-11 | 2015-04-29 | 新奥气化采煤有限公司 | Underground gasification method |
| CN105041290A (en) * | 2015-02-13 | 2015-11-11 | 新奥气化采煤有限公司 | Multilayer coal seam gasification furnace and coal seam gasification method |
| CN105525903A (en) * | 2015-08-10 | 2016-04-27 | 柴兆喜 | Upward gas injection coal roadway gasifier type gasification mine |
| CN205297520U (en) * | 2015-08-10 | 2016-06-08 | 柴兆喜 | Go up to gas injection coal road gasifier formula gasification mine |
| CN107091078A (en) * | 2017-06-15 | 2017-08-25 | 新疆国利衡清洁能源科技有限公司 | Underground coal gasification passage and its method |
| CN110552677A (en) * | 2019-09-05 | 2019-12-10 | 中国矿业大学(北京) | Mine type coal underground gasification furnace and gasification method |
| WO2021109922A1 (en) * | 2019-12-03 | 2021-06-10 | 中国矿业大学 | Method for designing width of isolation coal pillar and gasifier in underground gasification under aquifer facing overlying strata |
| CN111173491A (en) * | 2020-03-09 | 2020-05-19 | 山东科技大学 | Pre-control structure of underground gasification furnace, gasification furnace and gasification method |
| CN112081558A (en) * | 2020-10-10 | 2020-12-15 | 西安科技大学 | Coal underground gasification and coalbed methane collaborative mining method, structure and construction method |
| CN112483063A (en) * | 2020-12-17 | 2021-03-12 | 西安科技大学 | Underground interlayer type coal in-situ gasification mining system and construction method thereof |
| CN112483062A (en) * | 2020-12-17 | 2021-03-12 | 西安科技大学 | Underground interlayer type coal in-situ gasification mining method and system |
| CN112878978A (en) * | 2021-01-29 | 2021-06-01 | 中国矿业大学 | Supercritical water fracturing synergistic hydrogen production method for underground coal gasification |
| CN115075778A (en) * | 2021-03-11 | 2022-09-20 | 中国石油化工股份有限公司 | Coal bed gas/coal bed integrated recovery method and device, electronic equipment and medium |
| WO2023007467A2 (en) * | 2021-07-30 | 2023-02-02 | Ohio State Innovation Foundation | Systems and methods for generation of hydrogen by in-situ (subsurface) serpentinization and carbonization of mafic or ultramafic rock |
| CN113775376A (en) * | 2021-08-17 | 2021-12-10 | 西安科技大学 | In-situ pyrolysis and CO of oil-rich coal2Geological sealing and storing integrated method |
| CN113653470A (en) * | 2021-10-21 | 2021-11-16 | 西南石油大学 | Coal bed in-situ hydrogen production and coal bed gas development integrated method and structure |
| CN114233265A (en) * | 2021-12-31 | 2022-03-25 | 西安交通大学 | Coal in-situ pyrolysis poly-generation and carbon dioxide sequestration system and method |
| CN114412433A (en) * | 2022-01-20 | 2022-04-29 | 中国矿业大学 | Deep coal in-situ fluidization mining method based on heat extraction power generation |
| CN114876428A (en) * | 2022-04-27 | 2022-08-09 | 陕西省煤田地质集团有限公司 | Modularization and cascade development method for underground in-situ conversion of oil-rich coal |
| CN114876438A (en) * | 2022-05-08 | 2022-08-09 | 太原理工大学 | Coal mining method for in-situ hydrogen production of filling coal |
| CN115559700A (en) * | 2022-10-25 | 2023-01-03 | 中国地质调查局水文地质环境地质调查中心 | With CO 2 Underground coal gasification method for high geothermal abnormal region by combining geological sequestration technology |
| CN115596426A (en) * | 2022-10-26 | 2023-01-13 | 中国石油化工股份有限公司（Cn） | double-L-shaped underground gasification well spacing method for deep coal |
| CN116066803A (en) * | 2023-01-10 | 2023-05-05 | 重庆大学 | Coal seam in-situ direct combustion energy taking system and method |
| CN115977603A (en) * | 2023-02-22 | 2023-04-18 | 大连理工大学 | Gas-water CO-injection CO based on multistage fracturing 2 Hydrate sealing cover layer generation system and regulation and control method |
| CN116066052A (en) * | 2023-03-07 | 2023-05-05 | 太原理工大学 | Method for carrying out post-side filling-in-situ gasification collaborative recovery of residual coal post in residual mining area |
Non-Patent Citations (10)
| Title |
|---|
| CO2 enhanced in-situ oxy-coal gasification based carbon-neutral conventional power generating systems;V. Prabu;《Energy》;第84卷;全文 * |
| Coal measure energy production and the reservoir space utilization in China under carbon neutral target;Run Chen1;《FRONTIERS IN EARTH SCIENCE》;全文 * |
| King coal: restoring the monarchy by underground gasification coupled to CCS;Younger, PL;《7th Petroleum Geology Conference》;全文 * |
| 利用深层煤炭地下气化技术建设煤穴储气库的可行性研究;孔令峰;《天然气工业》;第36卷(第3期);全文 * |
| 化石能源低碳循环开采技术及新疆示范工程;梁杰;《工程研究-跨学科视野中的工程》;第8卷(第4期);全文 * |
| 国内外煤炭地下气化试验及其对新疆煤炭地下气化的启示;韦波;《煤炭科技》;第43卷(第4期);全文 * |
| 煤层地下气化开采技术风险综合评价及应对策略研究;张朋;《中国优秀硕士论文全文库工程科技I辑》(第3期);全文 * |
| 煤炭地下气化技术进展;杨甫;《科技导报 》;第38卷(第20期);全文 * |
| 煤炭地下气化腔CO2埋存的研究进展及发展趋势;李龙龙;《力学学报》;第55卷(第3期);全文 * |
| 超临界CO2驱替煤层CH4装置及试验研究;梁卫国;《煤炭学报》;第39卷(第8期);全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN116575900A (en) | 2023-08-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN116575900B (en) | In-situ coal partition controllable gasification hydrogen production and CO 2 Sealing and storing integrated method | |
| US10655441B2 (en) | Stimulation of light tight shale oil formations | |
| CN101798915B (en) | Method for improving recovery ratio of thick-layer massive thickened oil by utilizing subsection fireflooding exploitation | |
| US20150125210A1 (en) | Excavated underground caverns for fluid storage | |
| CN103670338A (en) | Method for extracting coalbed methane and coal together | |
| Jia et al. | Numerical modeling on air injection in a light oil reservoir: recovery mechanism and scheme optimization | |
| WO2008027506A2 (en) | Method of storage of sequestered greenhouse gasses in deep underground reservoirs | |
| CN112610191B (en) | Method for exploiting natural gas hydrate reservoir permeable by cover layer by utilizing branch horizontal well | |
| CN112127866B (en) | Process for developing deep coal bed by using underground coal gasification technology | |
| JP2012519587A (en) | Method for isolating fluid in the formation | |
| RU2358099C1 (en) | Procedure for development of high viscous oil | |
| CN107575185A (en) | A kind of method in underground using the effect extraction coal bed gas that colds and heat succeed each other | |
| CN108915649B (en) | Oil reservoir pressure plugging and flooding process mode optimization method | |
| CN106837277A (en) | Oil reservoir recovery method and device | |
| US20130223935A1 (en) | Methods and arrangements for carbon dioxide storage in subterranean geological formations | |
| CN108086958A (en) | Gas hydrates frost well cementation hydrogen-oxygen displacement harmonic extraction method | |
| CN201794571U (en) | Sectional gas injection tube column | |
| Dang et al. | Lessons learned and experiences gained in developing the waterflooding concept of a fractured basement-granite reservoir: A 20-year case study | |
| CN111827997A (en) | Exploitation method for improving recovery ratio of low-pressure tight oil reservoir | |
| CN112855111B (en) | Underground gasification system and method for electric heating coal bed | |
| CN114961668A (en) | Fracture-type hot dry rock reservoir double-inclined-well segmented regulation and enhanced heat recovery method | |
| CN117823112B (en) | In-situ coal supercritical water gasification hydrogen production different-layer mining method and device | |
| Ge et al. | Reservoir Management Makes a Marginal Field Fruitful in Bohai | |
| CN113006764B (en) | Multi-branch hydrate replacement mining method | |
| CN111550222B (en) | Method for exploiting natural gas hydrate by injecting steam |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |