CN117420043A - System and method for simulating geological carbon dioxide sequestration and methane yield increase of coal reservoir - Google Patents
System and method for simulating geological carbon dioxide sequestration and methane yield increase of coal reservoir Download PDFInfo
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- CN117420043A CN117420043A CN202311359048.7A CN202311359048A CN117420043A CN 117420043 A CN117420043 A CN 117420043A CN 202311359048 A CN202311359048 A CN 202311359048A CN 117420043 A CN117420043 A CN 117420043A
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- 239000003245 coal Substances 0.000 title claims abstract description 144
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 84
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 81
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 42
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 39
- 230000009919 sequestration Effects 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 37
- 239000011435 rock Substances 0.000 claims abstract description 68
- 238000007789 sealing Methods 0.000 claims abstract description 55
- 238000003860 storage Methods 0.000 claims abstract description 52
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 43
- 238000000926 separation method Methods 0.000 claims abstract description 30
- 238000006073 displacement reaction Methods 0.000 claims abstract description 25
- 239000007788 liquid Substances 0.000 claims abstract description 25
- 238000004088 simulation Methods 0.000 claims abstract description 16
- 230000001965 increasing effect Effects 0.000 claims abstract description 12
- 239000007789 gas Substances 0.000 claims description 49
- 238000001514 detection method Methods 0.000 claims description 28
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 28
- 239000011707 mineral Substances 0.000 claims description 28
- 238000006243 chemical reaction Methods 0.000 claims description 26
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 22
- 229910052799 carbon Inorganic materials 0.000 claims description 22
- 238000001179 sorption measurement Methods 0.000 claims description 21
- 230000033558 biomineral tissue development Effects 0.000 claims description 18
- 239000008398 formation water Substances 0.000 claims description 13
- 238000012360 testing method Methods 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 11
- 229920006395 saturated elastomer Polymers 0.000 claims description 11
- 230000003068 static effect Effects 0.000 claims description 9
- 238000004090 dissolution Methods 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 238000002360 preparation method Methods 0.000 claims description 7
- 230000008859 change Effects 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 6
- 230000007704 transition Effects 0.000 claims description 6
- 230000000638 stimulation Effects 0.000 claims description 5
- 229910002091 carbon monoxide Inorganic materials 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 claims description 2
- 238000009933 burial Methods 0.000 abstract description 4
- 238000002347 injection Methods 0.000 description 11
- 239000007924 injection Substances 0.000 description 11
- 238000002474 experimental method Methods 0.000 description 7
- 230000035699 permeability Effects 0.000 description 7
- 229920001971 elastomer Polymers 0.000 description 6
- 238000011156 evaluation Methods 0.000 description 5
- 238000004364 calculation method Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000000605 extraction Methods 0.000 description 3
- 230000014759 maintenance of location Effects 0.000 description 3
- 241000282414 Homo sapiens Species 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010792 warming Methods 0.000 description 2
- 101100314150 Caenorhabditis elegans tank-1 gene Proteins 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000012854 evaluation process Methods 0.000 description 1
- 238000013401 experimental design Methods 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000004083 survival effect Effects 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
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- 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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/164—Injecting CO2 or carbonated water
-
- 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
- E21B43/006—Production of coal-bed methane
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/0806—Details, e.g. sample holders, mounting samples for testing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/088—Investigating volume, surface area, size or distribution of pores; Porosimetry
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
- G01N5/02—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by absorbing or adsorbing components of a material and determining change of weight of the adsorbent, e.g. determining moisture content
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
- G01N5/04—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N7/00—Analysing materials by measuring the pressure or volume of a gas or vapour
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N7/00—Analysing materials by measuring the pressure or volume of a gas or vapour
- G01N7/14—Analysing materials by measuring the pressure or volume of a gas or vapour by allowing the material to emit a gas or vapour, e.g. water vapour, and measuring a pressure or volume difference
Abstract
The invention discloses a system and a method for simulating geological carbon dioxide sequestration and methane yield increase of a coal reservoir, and belongs to the technical field of geochemistry. In an analog system, CO 2 The gas tank, the stratum water storage tank and the rock sample storage tank are connected in parallel between the first transverse diversion pipe and the second transverse diversion pipe; the transverse flow guiding pipe I is connected with the front flow guiding cavity of the clamp holderThe rear diversion cavity is connected with a gas-liquid separator, and the gas-liquid separator is connected with CO 2 ‑CH 4 Separation equipment is connected with CO 2 ‑CH 4 Separating equipment and methane and CO respectively 2 The collecting bottles are connected; and a displacement pump is arranged at one end of the second transverse flow guiding pipe. The simulation system can directly simulate coal reservoir environments with different burial depths, and can directly evaluate and estimate CO on the basis 2 Actual sealing quantity in deep coal seam and sealing quantity of different sealing modes, and increasing yield of methane; in addition, the system can realize different phase state CO 2 Meeting the requirement of CO from coal reservoirs with different burial depths 2 The experimental requirements of the sealing.
Description
Technical Field
The invention belongs to the technical field of geochemistry, and particularly relates to a system and a method for simulating geological carbon dioxide storage and methane yield increase of a coal reservoir.
Background
With the rapid development of the global industry, a large amount of CO 2 Is discharged into an ecological system, the concentration of carbon dioxide in the atmosphere is continuously increased, the greenhouse effect is continuously accumulated, and a series of problems caused by global climate warming seriously threaten sustainable survival of human beings. In recent years, the problem of reducing carbon and reducing carbon is emphasized by various industries. Wherein CO 2 Is one of the most potential technical methods for controlling carbon dioxide emission, and a plurality of COs 2 Geological sequestration projects also demonstrate their technical feasibility, by reducing carbon dioxide emissions and capturing them, it is possible to reduce the concentration of greenhouse gases in the atmosphere, slow down the rate of global warming, and provide longer adaptation and adjustment times for human society and ecosystems.
CO 2 By capturing and sequestering carbon dioxide is meant capturing and sequestering carbon dioxideIn geologic bodies such as oil-gas fields, gas layers, saline water layers and the like, CO 2 Geological sealing helps to largely offset the inextensible carbon emissions. After carbon dioxide is charged into the deep coal seam, different types of sequestration processes can occur, mainly including adsorption sequestration, static sequestration (sequestration type of pore fissures in coal stored in free form under the constraints of formation or hydrodynamic forces), dissolution sequestration (CO) 2 CO is blocked in the form of carbonate ions dissolved in water 2 ) And mineralization sequestration (with minerals and dissolved CO 2 Is used for sealing CO through formation water reaction 2 )。
At present, the sealing reaction process in the geological sealing process of carbon dioxide is based on the traditional CO 2 The process of sequestering geochemical reactions, the CO is presumed only from typical chemical reaction equations 2 The post-filling sequestration process is thus not representative of CO in the subsurface geologic volume 2 The uncertainty of the reaction process, which actually occurs after filling, further leads to the fact that the accuracy of the estimated value of the sealing quantity in the actual deep coal seam sealing potential evaluation process is to be questioned, and the method is particularly characterized in that the sealing quantity and CO of different modes cannot be accurately calculated 2 The actual total sealing amount of (C) is also difficult to evaluate and calculate CO 2 Sealing and displacing CH in deep coal seam 4 The economic benefit brought by the sealing process cannot be effectively evaluated.
For example, chinese patent CN215369806U discloses a system for geological sequestration of carbon dioxide in cooperation with biological stimulation of coalbed methane, comprising a first injection well, a second injection well and a production well, which are sequentially arranged, as well as a supercritical carbon dioxide injection system, a coalbed methane biological injection system and a gas production extraction system; the supercritical carbon dioxide injection system is communicated with the first injection well, the coalbed methane biological injection system is communicated with the second injection well, the production well is communicated with the gas production extraction system, the system for carbon dioxide geological sequestration and coalbed methane biological yield increase provided by the scheme can only analyze the carbon dioxide sequestration quantity of a specified buried coal reservoir by utilizing carbon dioxide to displace free coalbed methane in the coalbed methane, and can not accurately calculate the carbon dioxide sequestered quantity based on different sequestration forms,then, errors exist in estimating the yield increasing effect of the coal bed; in addition, when the system is used for simulating the environment in the coal reservoir, supercritical carbon dioxide needs to be independently input, the operation is complex, the application range is small, the conversion of different phase carbon dioxide cannot be realized, and the supercritical CO under the condition of the in-situ reservoir is difficult to carry out 2 Extraction and permeability testing.
Accurate CO 2 The geological sequestration calculation evaluation method is one of key factors influencing the sequestration potential of the carbon dioxide in the deep coal seam, and determines the CO aiming at the deep coal seam 2 Design and planning of the sealing project. Therefore, there is a need to develop more accurate and realistic deep coal seam CO 2 Geological sequestration evaluation systems and methods.
Disclosure of Invention
The invention aims to solve the problems in the prior art, and provides a system and a method for simulating geological carbon dioxide sequestration and methane yield increase of a coal reservoir, which can accurately calculate the amount of carbon dioxide sequestered based on different sequestration forms and can accurately estimate the coal seam yield increase effect.
The technical scheme of the invention is as follows: a carbon dioxide geological sequestration and coal reservoir methane production increase simulation system comprises CO 2 A gas tank, a formation water storage tank, a rock sample storage tank, a clamp and a gas-liquid separator; CO 2 The gas tank, the stratum water storage tank and the rock sample storage tank are connected in parallel between the first transverse diversion pipe and the second transverse diversion pipe; the transverse flow guide pipe I is connected with a front flow guide cavity of the clamp holder, a rear flow guide cavity of the clamp holder is connected with a gas-liquid separator, and a gas delivery pipe of the gas-liquid separator is connected with CO 2 -CH 4 Separation equipment is connected with CO 2 -CH 4 Separation equipment is respectively connected with a methane collecting bottle and CO 2 The collecting bottles are connected; the booster pump is communicated with the transverse diversion pipe I; one end of the transverse flow guide pipe II is provided with a displacement pump; the heater is in communication with the rock sample tank and the holder.
Further, the rock sample in the rock sample storage tank and the experimental coal sample in the clamp are respectively detected by a first mineral analyzer and a second mineral analyzer to obtain the carbon element content.
Further, in CO 2 Gas tank, formation water tank, rock sample tank and holder both ends, gas inlet end of gas-liquid separator and CO 2 The air inlet ends of the collecting bottles are respectively provided with a flowmeter.
Further, a pressure gauge and a temperature gauge are connected to the holder to monitor the temperature and pressure values in the holder.
Further, the other end of the transverse flow guiding pipe II and CO 2 The collection bottles are communicated for CO 2 Is recovered.
The process for evaluating and calculating the geological carbon dioxide sequestration amount and the methane increment of the coal reservoir by using the simulation system comprises the following steps:
①CO 2 dissolution sealing quantity M Dissolving Is determined by: CO injection into formation water storage tanks using displacement pumps 2 Until the difference value of the numerical values displayed by the flow meters at the two ends of the inlet and the outlet of the stratum water storage tank is not changed, the difference value of the numerical values displayed by the flow meters at the two ends of the stratum water storage tank is CO 2 The dissolved flow in the stratum water is calculated to obtain CO 2 Is a dissolution sealing amount M of (2) Dissolving ；
②CO 2 Mineralization sealing quantity M of (2) Mineralization Is determined by: for measuring C% of carbon element content of rock sample in rock sample storage tank by mineral analyzer Initially, the method comprises And bearing the rock sample to obtain the initial mass M of the rock sample Initially, the method comprises Dissolving CO in stratum water storage tank by using displacement pump 2 The stratum water after the treatment is displaced into a rock sample storage tank to carry out saturated water operation on the rock sample until the difference value of the numerical values displayed by the flow meters at the two ends of the inlet and the outlet of the rock sample storage tank is not changed, the rock sample is dried, and the content C% of carbon element in the dried rock sample is measured by a mineral analyzer I Terminal (A) Measuring mass M of final rock sample Terminal (A) Obtaining CO 2 Mineralization of (M) Mineralization ＝(M Terminal (A) *C％ Terminal (A) -M Initially, the method comprises *C％ Initially, the method comprises )*CO 2 Molecular weight/C molecular weight;
③CO 2 adsorption sealing quantity M of (2) Adsorption of Is determined by: experimental coal sample in clamp holder measured by mineral analyzer IIInitial carbon content C% Coal primary Weighing the experimental coal sample to obtain the initial mass M of the experimental coal sample Coal primary Dissolving CO in stratum water storage tank by using displacement pump 2 The stratum water after the treatment is displaced into the clamp holder to carry out saturated water operation on the experimental coal sample, and meanwhile, excess CO is introduced into the clamp holder by using the displacement pump 2 The gas is heated to dry the experimental coal sample by opening the heater until the difference value of the numerical values displayed by the flowmeter at the inlet and the outlet of the clamp is equal, and the dried experimental coal sample is weighed to obtain the final mass M of the experimental coal sample Coal terminal The second mineral analyzer is used for measuring the content C% of carbon element in the experimental coal sample Coal terminal Calculated to obtain CO 2 Amount M of mineral reaction with the test coal sample Reaction ，M Reaction ＝(M Coal terminal *C％ Coal terminal -M Coal primary *C％ Coal primary )*CO 2 Molecular weight/C molecular weight, and obtaining CO according to the quality change of the coal samples before and after saturated water operation 2 Total consumption M in coal sample Total consumption = M Coal terminal -M Coal primary The method comprises the steps of carrying out a first treatment on the surface of the Total consumption minus CO 2 The reaction quantity with mineral substances in coal to obtain CO 2 Adsorption and storage amount of (a), namely M Adsorption of ＝M Total consumption of -M Reaction ；
④CO 2 Separation amount M of (2) Separation Is determined by: in the step (3), excess CO is introduced into the system by using a displacement pump 2 Excess CO 2 CH replaced in experimental coal sample 4 The gas enters a gas-liquid separator along with part of coal bed water and is separated out, and then passes through CO 2 -CH 4 The separation equipment separates two gases, and redundant CO is obtained according to the display value of the flowmeter 2 Volume V of (2) Residual CO2 And CH (CH) 4 Volume V of (2) CH4 And then obtain the separated CO 2 Mass M of (2) Separation And CH (CH) 4 Mass M of (2) CH4 ，M CH4 Namely, increasing the yield of methane;
⑤CO 2 static sealing quantity M of (2) Static sealing ＝M Introducing into -M Dissolving -M Mineralization -M Adsorption of -M Reaction -M Separation According to CO 2 Experimental initial and final difference value displayed by flowmeter at gas outlet end of gas tank to determine CO 2 On the basis of which the CO introduced into the system is known 2 Is the total mass M of (2) Introducing into ，CO 2 Total sealing quantity M of (2) Total amount of sealing ＝M Introducing into -M separation.
Further, in order to simulate the environments of coal reservoirs with different depths, a heater and a booster pump are required to be opened to change the temperature and the pressure of an experimental coal sample so as to carry out a sealing experiment, and the temperature and the pressure environments can be monitored in real time through a pressure gauge and a thermometer which are connected with a clamp holder.
Further, in deep coal seams, CO 2 The phase transition is carried out, and the supercritical state is used for acting on the coal reservoir to simulate supercritical CO 2 Damage to coal reservoirs requiring supercritical CO 2 The preparation method comprises the following specific preparation processes: placing the experimental coal sample into a clamp holder, evacuating air in the clamp holder by using a vacuum pump communicated with a detection cavity of the clamp holder, enabling the pressure value in the clamp holder to reach-0.19 MPa, maintaining the pressure, and using a booster pump to carry out CO (carbon monoxide) 2 The gas in the gas tank is increased to not less than 8MPa, so that CO therein 2 The gas is changed from the gas state to the liquid state, and the liquid state CO is processed by a condenser 2 Temperature adjustment, CO utilization of displacement pump 2 Introducing into a holder, heating the inside of the holder to a temperature of not lower than 32deg.C by a heater to obtain CO 2 Transition to the supercritical state.
Compared with the prior art, the invention has the following advantages:
1. the simulation system disclosed by the application can directly simulate the environments of coal reservoirs with different burial depths, and can directly evaluate and calculate CO on the basis 2 Actual sealing amount in deep coal seam and sealing amount of different sealing modes, including dissolution sealing amount M Dissolving Mineralization sealing quantity M Mineralization Adsorption sealing quantity M Adsorption of Amount M of reaction with mineral substances in the experimental coal sample Reaction CO 2 Separation amount M of (2) Separation Then according to CO 2 Total sealing quantity M of (2) Total amount of sealing Obtaining CO 2 Static sequestration of (2) static sequestration quantity M, CO disclosed in the present application 2 The geological storage calculation evaluation method is more accurate and more practical;
2. the simulation system disclosed by the application can be used for directly obtaining the increased yield of methane when the calculation and evaluation of the geological carbon dioxide sealing quantity are carried out, so that the economic benefit increased in the geological sealing process can be estimated conveniently;
3. the simulation system disclosed by the application can realize different phase states of CO 2 To meet the requirement of CO from coal reservoirs with different burial depths 2 The experiment requirement during sealing can be met, and the CO can be effectively measured through a permeability test 2 And entering the coal reservoir to cause damage to the coal reservoir.
Drawings
FIG. 1 is a schematic diagram of a carbon dioxide geological sequestration and coal reservoir methane stimulation simulation system;
FIG. 2 is a schematic structural view of the detection cylinder;
wherein 1-CO 2 Gas tank, 2-stratum water storage tank, 3-rock sample storage tank, 4-clamp, 5-gas-liquid separator, 6-methane collecting bottle and 7-CO 2 Collecting bottle, 8-first transverse flow guiding pipe, 9-second transverse flow guiding pipe and 10-CO2-CH 4 The separation device comprises a separation device, an 11-booster pump, a 12-displacement pump, a 13-mineral analyzer I, a 14-mineral analyzer II, a 15-heater, a 16-pressure gauge, a 17-thermometer and an 18-condenser;
41-detecting cavity, 42-vacuum pump, 43-auxiliary pump, 44-buffer tank;
441-detecting cylinder, 442-front end cover, 443-rear end cover, 444-auxiliary baffle ring, 445-guide sleeve, 446-driving piston, 447-front rock chamber, 448-rear rock core chamber, 449-bearing rubber sleeve, 440-elastic backing plate, 4401-strain gauge, 4402-displacement sensor, 4403-wire, 4404-axial pressurizing port, 4405-axial pressure relief port, 4406-detecting port, 4407-annular pressurizing port, 4408-front diversion cavity, 4409-rear diversion cavity;
101-valve one, 102-valve two, 103-valve five, 104-valve six, 105-valve seven, 106-valve eight, 107-valve four, 108-valve nine, 109-valve ten, 110-valve eleven, 111-valve twelve, 112-valve two.
Detailed Description
The following description of the present invention is provided with reference to the accompanying drawings, but is not limited to the following description, and any modifications or equivalent substitutions of the present invention should be included in the scope of the present invention without departing from the spirit and scope of the present invention.
To better evaluate deep coal seam to CO 2 Is used for accurately calculating CO 2 Sealing quantity and methane yield, in this embodiment, a carbon dioxide geological sealing quantity and methane yield simulation system for coal reservoirs is disclosed, including CO 2 Gas tank 1, formation water tank 2, rock sample tank 3, gripper 4, gas-liquid separator 5, methane collection bottle 6, and CO 2 Collecting bottle 7, CO 2 The gas tank 1, the stratum water storage tank 2 and the rock sample storage tank 3 are connected in parallel between the transverse diversion pipe I8 and the transverse diversion pipe II 9 through diversion branch pipes.
In CO 2 Gas tank 1, formation water storage tank 2, rock sample storage tank 3, holder 4, inlet end of gas-liquid separator 5 and CO 2 The air inlet ends of the collecting bottles 7 are respectively provided with a flowmeter. One flowmeter (the flowmeters in the figure are denoted by A1, A2 … … a 10) is provided.
In CO 2 The two ends of the gas tank 1 are respectively provided with a valve I11 and a valve III 12 for controlling gas output, the two ends of the stratum water storage tank 2 are respectively provided with a valve V13 and a valve V14, and the two ends of the rock sample storage tank 3 are respectively provided with a valve V15 and a valve V16.
The transverse flow guide pipe I8 is connected with a front flow guide cavity of the clamp holder 4, a rear flow guide cavity of the clamp holder 4 is connected with the gas-liquid separator 5 through the flow guide pipe, and a gas outlet pipe of the gas-liquid separator 5 is connected with the CO2-CH 4 Separation apparatus 10 is connected to CO2-CH 4 Separation apparatus 10 is associated with methane collection bottle 6 and CO, respectively 2 The collecting bottles 7 are connected through a flow guiding pipe.
The booster pump 11 is communicated with the transverse diversion pipe I8 through a diversion pipeline, the outlet end of the booster pump 11 is provided with a valve IV 107, one end of the transverse diversion pipe II 9 is provided with a displacement pump 12, and the other end of the transverse diversion pipe II is communicated with CO 2 The collecting bottle 7 is communicated through a diversion branch pipe.
The rock sample or experimental coal sample in the rock sample storage tank 3 and the clamp 4 can be detected by a first mineral analyzer 13 and a second mineral analyzer 14 respectively.
The heater 15 is connected with the rock sample storage tank 3 and the clamp 4 through diversion pipelines respectively to heat and dry the rock sample and the coal sample.
A pressure gauge 16 and a temperature gauge 17 are connected to the holder 4 for monitoring the temperature and pressure values in the holder 4.
The holder 4 comprises a detection cavity 41, a vacuum pump 42 and an auxiliary pump 43, wherein a front diversion cavity of the detection cavity 41 is communicated with a transverse diversion pipe I8, a rear diversion cavity is connected with the gas-liquid separator 5 through the diversion pipe, the vacuum pump 42 is communicated with the front end face of the detection cavity through a buffer tank 44, the auxiliary pumps 43 are arranged in total and are respectively communicated with the detection cavity 41, and a pressure gauge is respectively arranged on the diversion pipe connecting the detection cavity 41 with the buffer tank 44 and the auxiliary pump 43.
The detection chamber 41 includes a detection cylinder 441, a front end cover 442, a rear end cover 443, an auxiliary baffle ring 444, a guide sleeve 445, a driving piston 446, a front core chamber 447, a rear core chamber 448, a carrier rubber sleeve 449, an elastic cushion 440, a strain gauge 4401, and a displacement sensor 4402.
The detection cylinder 441 has a hollow tubular structure, the rear end face of which is connected to the rear end cover 443, the front end face of which is connected to the front end cover 442 via the guide sleeve 445, and the detection cylinder 441, the front end cover 442, the rear end cover 443, and the guide sleeve 445 are coaxially distributed.
The front rock chamber 447 and the rear rock chamber 448 are of a convex columnar structure, one ends of the front rock chamber 447 and the rear rock chamber 448 are embedded in the detection cylinder 441 and are coaxially distributed with the detection cylinder 441, the other ends of the front rock chamber 447 and the rear rock chamber 448 respectively extend out of the front end cover 442 and the rear end cover 443, a front diversion cavity 4403 coaxially distributed with the detection cylinder 441 is arranged in the front rock chamber 447, a rear diversion cavity 4409 coaxially distributed with the detection cylinder 441 is arranged in the rear rock chamber 448, the front rock chamber 447 is in sliding connection with the front end cover 442 and the detection cylinder 441 through an auxiliary baffle ring 444 and is propped against the driving piston 446, the driving piston 446 is embedded in the front end cover 442 and is positioned between the front end cover 442 and the guide sleeve 445, at least one axial pressurizing opening 4404 is arranged on the side surface of the front end cover 442 corresponding to the rear end surface of the driving piston 446, an axial pressure releasing opening 4405 is arranged on the outer side surface of the guide sleeve 445 corresponding to the front end surface of the driving piston 446, and the axial pressurizing opening 4404 and the axial pressurizing opening 4405 are respectively communicated with the driving piston 446 and are communicated with an auxiliary pump 43 through the guide pipe.
The bearing rubber sleeve 449 is embedded in the detection cylinder 441 and is propped against the inner side surface of the detection cylinder 441, the bearing rubber sleeve 449 is coaxially distributed with the detection cylinder 441, two ends of the bearing rubber sleeve 449 are respectively connected with auxiliary baffle rings 444 arranged at two ends of the detection cylinder 441 and are coated on the outer side surfaces of a front rock chamber 447 and a rear rock core chamber 448, an elastic backing plate 440 and a strain gauge 4401 are both positioned in the bearing chamber, the elastic backing plate 440 is propped against the front end surface of the rear rock core chamber 448 and is coaxially distributed, a detection port 4406 and an annular pressurizing port 4407 are arranged on the side wall of the bearing chamber corresponding to the detection cylinder 441, the detection port 4406 is connected with a thermometer 17, and the annular pressurizing port 4407 is in clearance communication with the bearing rubber sleeve 449 and the detection cylinder 441 and is simultaneously communicated with an auxiliary pump 43 through a honeycomb duct; at least one strain gage 4401, wherein each strain gage 4401 is electrically connected with a lead 4403, and the other end of the lead 4403 is positioned outside the detection cylinder 441 through a rear end cover 443; the displacement sensor 4402 is located outside the detection cylinder 441 and is connected to a portion of the front core chamber 447 located outside the detection cylinder 441.
1、CO 2 Sealing test experiment
The specific process for carrying out evaluation calculation on the geological carbon dioxide sequestration quantity and the methane increment of the coal reservoir by using the simulation system is as follows:
①CO 2 dissolution sealing quantity M Dissolving Is determined by: the first, third and sixth valves (101/102/104) are opened, and CO is injected into the stratum water storage tank 2 by using the displacement pump 12 2 Stopping gas injection until the difference of the values displayed by the flow meters at the two ends of the inlet and the outlet of the stratum water storage tank 2 is no longer changed, wherein the difference of the values displayed by the flow meters (A3 and A4) at the two ends of the stratum water storage tank 2 is CO 2 The dissolved flow in the stratum water can calculate the CO according to the mass volume formula 2 Is a dissolution sealing amount M of (2) Dissolving . And (3) injection: the formation water tank capacity can be set according to the requirements of the experiment, for example, the formation water amount is designed to be 100mL in the embodiment,the formation water tank capacity may be set at 120mL.
②CO 2 Mineralization sealing quantity M of (2) Mineralization Is determined by: the first, third and sixth valves (101/102/104) are closed, the first mineral analyzer 13 is used for measuring the carbon content of the rock sample in the rock sample tank 3, then the fifth, sixth and eighth valves (103/104/106) are opened, and the displacement pump 12 is used for dissolving CO in the stratum water storage tank 2 2 The stratum water after the treatment is displaced into a rock sample storage tank 3 to carry out saturated water operation on a rock sample (a top-bottom plate rock sample of a test coal sample, which is in a cylinder shape of 100mm (d) by 100mm (h)) in the rock sample storage tank until the difference value of values displayed by flow meters at the two ends of an inlet and an outlet of the rock sample storage tank 3 is not changed (A5 and A6), then valves five, six and eight (103/104/106) are closed, a valve nine 108 and a heater 15 are opened, the rock sample after the saturated water operation in the rock sample storage tank 3 is dried, the carbon element content in the dried rock sample is measured by a mineral analyzer I13 again, and the mass M of the initial rock sample is used Initially, the method comprises And its initial carbon content C% Initially, the method comprises Mass M of final rock sample Terminal (A) Final carbon content C% Terminal (A) Can obtain CO 2 Mineralization of (C), i.e. M Mineralization ＝(M Terminal (A) *C％ Terminal (A) -M Initially, the method comprises *C％ Initially, the method comprises )*CO 2 Molecular weight/C molecular weight.
③CO 2 Adsorption sealing quantity M of (2) Adsorption of Is determined by: the valve nine 108 and the heater 15 were closed, and the initial carbon element content C% of the experimental coal sample (experimental coal sample selected from a cylindrical sample of 50mm (d) by 100mm (h) or a cylindrical sample of 25mm (d) by 50mm (h)) in the holder 4 was measured by the mineral analyzer two 14 Coal primary And weighing the experimental coal sample to obtain the initial mass M of the experimental coal sample Coal primary The valves five, six, eleven and twelve (103/104/110/111) are opened to dissolve CO in the formation water storage tank 2 by the displacement pump 12 2 The stratum water after the treatment is displaced into the clamp 4 to carry out saturated water operation on the experimental coal sample, meanwhile, the first valve and the third valve (101/102) are opened, and excessive CO is introduced into the clamp 4 by the displacement pump 12 2 Gas up to the difference in values displayed by the flow meters (A7, A8) at the inlet and outlet ends of the holder 4Equal, valve one, three, five, six and eleven (101/102/103/104/110) are closed, valve ten 109 and heater 15 are opened to dry the experimental coal sample after saturated water operation, heater 15 and valve ten 109 are closed, the dried experimental coal sample is weighed, then the carbon element content of the experimental coal sample is measured by mineral analyzer two 14, and the initial mass M of the experimental coal sample is calculated Coal primary And its initial carbon content C% Coal primary Final mass M of experimental coal sample Coal terminal Final carbon content C% Coal terminal Calculated out CO 2 Amount M of reaction with mineral substances in test coal sample Reaction ，M Reaction ＝(M Coal terminal *C％ Coal terminal -M Coal primary *C％ Coal primary )*CO 2 Molecular weight/C molecular weight, and obtaining CO according to the quality change of the coal samples before and after saturated water operation 2 Total consumption M in coal sample Total consumption of ＝M Coal terminal -M Coal primary The method comprises the steps of carrying out a first treatment on the surface of the Total consumption minus CO 2 The reaction quantity with mineral substances in coal to obtain CO 2 Adsorption and storage amount of (a), namely M Adsorption of ＝M Total consumption of -M Reaction ；
④CO 2 Separation amount M of (2) Separation Is determined by: in step (3), excess CO is introduced into the system by means of displacement pump 12 2 Excess CO 2 CH replaced in experimental coal sample 4 The gas will enter the gas-liquid separator 5 with part of the coal seam water and be separated out, and then go through CO 2 -CH 4 The separation device 10 performs separation of two gases, excess CO according to the value displayed by the flow meter (A10) 2 Volume V of (2) Residual CO2 CH is obtained from the difference between the two flow meters (A9, A10) 4 Volume V of (2) CH4 Obtaining the separated CO according to a mass-volume formula 2 Mass M of (2) Separation And CH (CH) 4 Mass M of (2) CH4 ，M CH4 Namely, increasing the yield of methane;
⑤CO 2 static sealing quantity M of (2) Static sealing ＝M Introducing into -M Dissolving -M Mineralization -M Adsorption of -M Reaction -M Separation ，CO 2 Gas tank1 flow meter at the outlet end shows experimental initial and final difference to determine CO 2 On the basis of which the CO introduced into the system can be known according to the mass-volume formula 2 Is the total mass M of (2) Introducing into ，CO 2 Total sealing quantity M of (2) Total amount of sealing ＝M Introducing into -M Separation Finally separating out CO 2 CO can be re-introduced through the diversion pipeline 2 The gas tank is recycled.
Since the deep coal seam is in a high-temperature and high-pressure environment, when an experiment is performed, in order to simulate the environments of coal reservoirs with different depths, the heater 15, the booster pump 11 and corresponding valves can be opened to change the temperature and the pressure of the experimental coal sample so as to perform a sealing experiment (for example, simulate the environment of a reservoir with the depth of 1000m and the temperature of 35 ℃ and the pressure of 9 MPa), and the temperature and the pressure environments can be monitored in real time by the pressure gauge 16 and the temperature gauge 17 which are connected with the clamp 4.
2. Supercritical CO 2 Preparation and permeability test
In deep coal seams, CO due to its relatively high temperature and pressure 2 The phase transition is carried out, the coal reservoir is acted in a supercritical state, and the system can simulate supercritical CO at the same time 2 Damage to coal reservoirs can be done by supercritical CO using the above system 2 Preparation and permeability test.
(1) Supercritical CO 2 Preparation
Placing experimental coal sample (cylindrical sample) into the holder 4, evacuating air in the holder 4 by using the vacuum pump 42 to make the pressure value in the holder 4 reach-0.19 MPa and maintaining pressure, then opening the valves III and IV (102/107), and using the booster pump 11 to pump CO 2 The gas in the gas tank 1 is increased to 9MPa, so that CO therein 2 The gas is changed from gas state to liquid state, then the valve IV 107 is closed, the valve II 112 is opened, and the liquid CO is discharged through the condenser 18 2 Tempering, closing valve two 112, opening valves one 101 and ten 109, CO using displacement pump 12 2 Into the holder 4, and raising the temperature in the holder 4 to 35 ℃ by the heater 15 to make CO 2 Transition to the supercritical state.
(2) Permeability test
The corresponding valves are opened, the booster pump 11, the auxiliary pump 43 of the clamp holder 4 and the heater 15 are utilized to increase the temperature and the pressure in the clamp holder 4, the shaft pressure and the ring pressure are respectively increased by 1MPa, 3MPa and 3MPa, and the heater 15 is utilized to increase the temperature in the clamp holder 4 to the experimental design temperature (such as room temperature 25 ℃). And then continuously supplying carbon dioxide into the clamp 4, keeping the temperature and the air pressure in the clamp 4 stable for 12 hours, reaching adsorption balance, and continuously recording the pressure and the temperature value of the coal sample in the adsorption process. After adsorption balance, closing the ventilation valve, discharging the pressure in the clamp 4, closing the system program, and completing the experiment, and calculating the permeability value of the sample according to the recorded result.
Before the permeability test of the coal sample, the porosity test is carried out on the coal sample by using a porosity tester, the length and the diameter of the sample are measured by using a vernier caliper, and the porosity data, the length and the diameter of the experimental coal sample are taken as basic data to be input into a system.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent structures or equivalent processes or direct or indirect application in other related arts are included in the scope of the present invention.
Claims (8)
1. A carbon dioxide geological sequestration amount and coal reservoir methane incremental yield simulation system is characterized by comprising CO 2 A gas tank, a formation water storage tank, a rock sample storage tank, a clamp and a gas-liquid separator;
CO 2 the gas tank, the stratum water storage tank and the rock sample storage tank are connected in parallel between the first transverse diversion pipe and the second transverse diversion pipe;
the transverse flow guide pipe I is connected with a front flow guide cavity of the clamp holder, a rear flow guide cavity of the clamp holder is connected with a gas-liquid separator, and a gas delivery pipe of the gas-liquid separator is connected with CO 2 -CH 4 Separation equipment is connected with CO 2 -CH 4 Separation equipment is respectively connected with a methane collecting bottle and CO 2 Collecting bottleConnecting;
the booster pump is communicated with the transverse diversion pipe I;
one end of the transverse flow guide pipe II is provided with a displacement pump;
the heater is in communication with the rock sample tank and the holder.
2. A carbon dioxide geological sequestration and coal reservoir methane production simulation system according to claim 1, wherein the rock sample in the rock sample storage tank and the experimental coal sample in the holder are respectively tested for carbon element content by a first mineral analyzer and a second mineral analyzer.
3. A carbon dioxide geological sequestration and coal reservoir methane stimulation simulation system according to claim 1, wherein the system is configured to simulate the production of carbon dioxide in the form of CO 2 Gas tank, formation water tank, rock sample tank and holder both ends, gas inlet end of gas-liquid separator and CO 2 The air inlet ends of the collecting bottles are respectively provided with a flowmeter.
4. A carbon dioxide geological sequestration and coal reservoir methane stimulation simulation system according to claim 1, wherein pressure gauges and thermometers are attached to the holders to monitor the temperature and pressure values within the holders.
5. The carbon dioxide geological sequestration and coal reservoir methane stimulation simulation system according to claim 1, wherein the other end of the transverse flow guide pipe II is connected with CO 2 The collection bottles are communicated for CO 2 Is recovered.
6. A method for evaluating and calculating the geological carbon dioxide sequestration amount and the methane sequestration amount of a coal reservoir, which is based on the simulation system for the geological carbon dioxide sequestration amount and the methane sequestration amount of the coal reservoir according to any one of claims 1 to 5, and comprises the following specific processes:
①CO 2 dissolution sealing quantity M Dissolving Is determined by: by means ofDisplacement pump injecting CO into formation water storage tank 2 Until the difference value of the numerical values displayed by the flow meters at the two ends of the inlet and the outlet of the stratum water storage tank is not changed, the difference value of the numerical values displayed by the flow meters at the two ends of the stratum water storage tank is CO 2 The dissolved flow in the stratum water is calculated to obtain CO 2 Is a dissolution sealing amount M of (2) Dissolving ；
②CO 2 Mineralization sealing quantity M of (2) Mineralization Is determined by: for measuring C% of carbon element content of rock sample in rock sample storage tank by mineral analyzer Initially, the method comprises And bearing the rock sample to obtain the initial mass M of the rock sample Initially, the method comprises Dissolving CO in stratum water storage tank by using displacement pump 2 The stratum water after the treatment is displaced into a rock sample storage tank to carry out saturated water operation on the rock sample until the difference value of the numerical values displayed by the flow meters at the two ends of the inlet and the outlet of the rock sample storage tank is not changed, the rock sample is dried, and the content C% of carbon element in the dried rock sample is measured by a mineral analyzer I Terminal (A) Measuring mass M of final rock sample Terminal (A) Obtaining CO 2 Mineralization of (M) Mineralization ＝(M Terminal (A) *C％ Terminal (A) -M Initially, the method comprises *C％ Initially, the method comprises )*CO 2 Molecular weight/C molecular weight;
③CO 2 adsorption sealing quantity M of (2) Adsorption of Is determined by: measuring initial carbon element content C% of experimental coal sample in clamp by mineral analyzer II Coal primary Weighing the experimental coal sample to obtain the initial mass M of the experimental coal sample Coal primary Dissolving CO in stratum water storage tank by using displacement pump 2 The stratum water after the treatment is displaced into the clamp holder to carry out saturated water operation on the experimental coal sample, and meanwhile, excess CO is introduced into the clamp holder by using the displacement pump 2 The gas is heated to dry the experimental coal sample by opening the heater until the difference value of the numerical values displayed by the flowmeter at the inlet and the outlet of the clamp is equal, and the dried experimental coal sample is weighed to obtain the final mass M of the experimental coal sample Coal terminal The second mineral analyzer is used for measuring the content C% of carbon element in the experimental coal sample Coal terminal Calculated to obtain CO 2 Amount M of reaction with mineral substances in test coal sample Reaction ，M Reaction ＝(M Coal terminal *C％ Coal terminal -M Coal primary *C％ Coal primary )*CO 2 Molecular weight/C molecular weight, and obtaining CO according to the quality change of the coal samples before and after saturated water operation 2 Total consumption M in coal sample Total consumption of ＝M Coal terminal -M Coal primary The method comprises the steps of carrying out a first treatment on the surface of the Total consumption minus CO 2 The reaction quantity with mineral substances in coal to obtain CO 2 Adsorption and storage amount of (a), namely M Adsorption of ＝M Total consumption of -M Reaction ；
④CO 2 Separation amount M of (2) Separation Is determined by: in the step (3), excess CO is introduced into the system by using a displacement pump 2 Excess CO 2 CH replaced in experimental coal sample 4 The gas enters a gas-liquid separator along with part of coal bed water and is separated out, and then passes through CO 2 -CH 4 The separation equipment separates two gases, and redundant CO is obtained according to the display value of the flowmeter 2 Volume V of (2) Residual CO2 And CH (CH) 4 Volume V of (2) CH4 And then obtain the separated CO 2 Mass M of (2) Separation And CH (CH) 4 Mass M of (2) CH4 ，M CH4 Namely, increasing the yield of methane;
⑤CO 2 static sealing quantity M of (2) Static sealing ＝M Introducing into -M Dissolving -M Mineralization -M Adsorption of -M Reaction -M Separation According to CO 2 Experimental initial and final difference value displayed by flowmeter at gas outlet end of gas tank to determine CO 2 On the basis of which the CO introduced into the system is known 2 Is the total mass M of (2) Introducing into ，CO 2 Total sealing quantity M of (2) Total amount of sealing ＝M Introducing into -M Separation 。
7. The method for evaluating and calculating the geological carbon dioxide sequestration amount and the methane increment of the coal reservoir according to claim 6, wherein in order to simulate the environment of the coal reservoirs with different depths, a heater and a booster pump are required to be turned on to change the temperature and the pressure of the experimental coal sample so as to perform sequestration experimental simulation, and the temperature and the pressure can be monitored in real time through a pressure gauge and a thermometer connected with a clamp.
8. The method for evaluating and calculating the geological carbon dioxide sequestration and methane sequestration of coal reservoirs of claim 6, wherein the CO is in a deep coal seam 2 The phase transition is carried out, and the supercritical state is used for acting on the coal reservoir to simulate supercritical CO 2 Damage to coal reservoirs requiring supercritical CO 2 The preparation method comprises the following specific preparation processes: placing the experimental coal sample into a clamp holder, evacuating air in the clamp holder by using a vacuum pump communicated with a detection cavity of the clamp holder, enabling the pressure value in the clamp holder to reach-0.19 MPa, maintaining the pressure, and using a booster pump to carry out CO (carbon monoxide) 2 The gas in the gas tank is increased to not less than 8MPa, so that CO therein 2 The gas is changed from the gas state to the liquid state, and the liquid state CO is processed by a condenser 2 Temperature adjustment, CO utilization of displacement pump 2 Introducing into a holder, heating the inside of the holder to a temperature of not lower than 32deg.C by a heater to obtain CO 2 Transition to the supercritical state.
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