CN115508496A - Water-rock reaction device and method for simulating atmospheric precipitation fluid and surrounding rock - Google Patents
Water-rock reaction device and method for simulating atmospheric precipitation fluid and surrounding rock Download PDFInfo
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Abstract
The invention discloses a water-rock reaction device and a water-rock reaction method for simulating atmospheric precipitation fluid and surrounding rock, which relate to the technical field of water-rock reaction and comprise the following steps: the reaction kettle is provided with a temperature control structure; the fluid injection structure comprises a fluid configuration component and an injection driving component, wherein the fluid configuration component is connected with the reaction kettle; the chemical signal acquisition structure is connected with the reaction kettle; the backflow structure has one end connected with the chemical signal acquisition structure and the other end connected with the fluid injection structure, and can backflow the fluid detected by the chemical signal acquisition structure into the fluid injection structure; the device can be through fluid injection structure configuration and to injecting the simulation atmosphere precipitation fluid of the temperature and the pressure of simulation certain degree of depth into reation kettle, utilize simulation atmosphere precipitation fluid to react with the rock specimen in the reation kettle to reaction solution after the monitoring reaction of chemical signal acquisition structure.
Description
Technical Field
The invention belongs to the technical field of water rock reaction, and particularly relates to a water rock reaction device and method for simulating atmospheric precipitation fluid and surrounding rock.
Background
The main oil-gas-containing basin in China has undergone or is undergoing the process of atmospheric precipitation fluid transformation, the atmospheric precipitation fluid can perform the corrosion transformation effect on the reservoir, and the current oil-gas exploration practice reveals the important oil-gas value of the reservoir transformed by the atmospheric precipitation. Atmospheric precipitation fluid migrates along the fracture system and continuously reforms the surrounding rock, the reservoir performance of the reformed surrounding rock is improved and promoted, the source of the fluid is mainly atmospheric precipitation, and carbon dioxide, soluble mineral components and the like can be dissolved in the process of contacting with the surrounding rock. The reservoir stratum transformed by the atmospheric precipitation fluid has a very wide distribution range, the carbonate rock strata series of the two major marine basins, namely the Tarim basin and the Sichuan basin, are particularly prominent, and the reservoir stratum is continuously transformed by the atmospheric precipitation from the surface life period to the deep burial period. The mechanism of the material and energy change and the dissolution and precipitation of the surrounding rock in the process of fluid rock interaction in the reconstruction process is not clear, so that the mechanism needs to be found out by carrying out an experiment for simulating the atmospheric precipitation fluid from the earth surface to the deep stratum to reconstruct the surrounding rock.
In actual geological environments, as the depth of the formation increases, the corresponding temperature and pressure also increase synchronously. In the atmosphere precipitation fluid surrounding rock experiment for simulating the formation environment, the biggest difficulty is that as the atmosphere precipitation enters a deep stratum from a shallow stratum, the atmosphere precipitation component is a dynamic change process, the atmosphere precipitation fluid continuously dissolves carbon dioxide, mineral components of the surrounding rock such as salts, gypsum minerals, carbonate rock minerals and the like are dissolved, and after the carbonate rock minerals in the fluid are supersaturated, the corresponding minerals can be precipitated under appropriate conditions. The atmosphere precipitation fluid surrounding rock experiment for simulating the formation environment is a dynamic dissolving and precipitating process of a fluid rock system containing three variables (temperature, pressure and minerals) on the whole, and a corresponding device and a method for simulating and quantitatively characterizing the process are lacked at present.
The existing water rock chemical reaction device mostly adopts a continuous flow method, a granular rock sample or a rock core sample is assembled in a reaction kettle, fluid enters the reaction kettle through a pipeline to react with the sample for a period of time, and the reaction process is calculated and presumed through the change of the microscopic morphology and the structural composition of the rock sample and the change of the concentration of ionic components in the fluid after the reaction. The device only designs a reaction kettle and a fluid booster pump, and can only simulate the water-rock reaction under the conditions of temperature and pressure at a certain depth, and the reaction pressure condition is single. Meanwhile, due to the lack of a corresponding fluid pressurization system, atmospheric precipitation fluid corresponding to the formation pressure condition cannot be prepared, and the reaction environment cannot be truly reproduced. However, only the reaction of atmospheric precipitation fluid and rock under the normal temperature and pressure environment of the earth surface is simulated, and the requirements of deep exploration and exploration of the reaction process and reaction mechanism of the deep fluid and rock are obviously not met.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a water-rock reaction device and a water-rock reaction method for simulating atmospheric precipitation fluid and surrounding rocks, wherein the device can be configured by a fluid injection structure and injects simulated atmospheric precipitation fluid for simulating the temperature and the pressure of a certain depth into a reaction kettle, utilizes the simulated atmospheric precipitation fluid to react with a rock sample in the reaction kettle, and monitors the reacted reaction solution by a chemical signal acquisition structure; the reaction of the simulated atmospheric precipitation fluid with the temperature and the pressure at different depths and the rock samples at different depths can be simulated through multiple experiments, and experimental basis is provided for reservoir transformation and prediction.
In order to achieve the above object, the present invention provides a water rock reaction device for simulating atmospheric precipitation fluid and surrounding rock, the device comprising:
the reaction kettle is provided with a temperature control structure;
the fluid injection structure comprises a fluid configuration component and an injection driving component, and the fluid configuration component is connected with the reaction kettle;
the chemical signal acquisition structure is connected with the reaction kettle;
and one end of the backflow structure is connected with the chemical signal acquisition structure, the other end of the backflow structure is connected with the fluid injection structure, and the backflow structure can enable fluid detected by the chemical signal acquisition structure to flow back into the fluid injection structure.
Optionally, the temperature control structure comprises a heating jacket, and the heating jacket is arranged on the outer side of the reaction kettle.
Optionally, the fluid dispensing assembly comprises:
the intermediate container is connected with the reaction kettle through a first pipeline, and a first valve, a preheater and a second valve are sequentially arranged on the first pipeline from one end close to the intermediate container to one end close to the reaction kettle;
the gas cylinder is connected with the intermediate container through a second pipeline, and a third valve and a gas booster pump are arranged on the second pipeline;
and the pressure container is connected with the intermediate container through a third pipeline, and a fourth valve and a first constant-pressure constant-flow pump are arranged on the third pipeline.
Optionally, carbon dioxide gas is stored in the gas cylinder, and water is stored in the pressure container.
Optionally, the reflow structure includes:
the input end of the separator is connected with the chemical signal acquisition structure through a fourth pipeline, and a back pressure valve is arranged on the fourth pipeline;
and one end of the second constant-pressure constant-flow pump is connected with the first outlet of the separator, the other end of the second constant-pressure constant-flow pump is connected with the fluid configuration assembly through a fifth pipeline, and a fifth valve is arranged on the fifth pipeline.
Optionally, a sixth valve is disposed on the second outlet of the separator.
Optionally, the injection driving component is the first constant-pressure constant-flow pump.
The invention also provides a water-rock reaction method for simulating the atmospheric precipitation fluid and the surrounding rock, which utilizes the water-rock reaction device for simulating the atmospheric precipitation fluid and the surrounding rock, and the method comprises the following steps:
disposing a first simulated atmospheric precipitation fluid within a fluid disposition assembly;
injecting the first simulated atmospheric precipitation fluid into a reaction kettle filled with a rock sample;
reacting the first simulated atmospheric precipitation fluid with the rock sample at a first set temperature and a first set pressure;
and monitoring a first chemical parameter in a first reaction fluid discharged from the reaction kettle after the first simulated atmospheric precipitation fluid reacts with the rock sample.
Optionally, said configuring the first simulated atmospheric precipitation fluid within the fluid configuration assembly comprises:
injecting water into the fluid dispensing assembly;
injecting carbon dioxide gas into the fluid configuration assembly filled with water to form a carbon dioxide solution in the fluid configuration assembly;
controlling the pressure of the carbon dioxide solution by controlling the injection amount of the carbon dioxide gas;
preheating the carbon dioxide solution to form the first simulated atmospheric precipitation fluid.
Optionally, after the monitoring the chemical parameter in the reaction fluid discharged from the reaction kettle after the first simulated atmospheric precipitation fluid reacts with the rock sample, the method further comprises:
disposing a second simulated atmospheric precipitation fluid within the fluid disposition assembly;
injecting the second simulated atmospheric precipitation fluid into the reaction kettle;
reacting the second simulated atmospheric precipitation fluid with the rock sample at a second set temperature and a second set pressure;
and monitoring a second chemical parameter in a second reaction fluid discharged from the reaction kettle after the second simulated atmospheric precipitation fluid reacts with the rock sample.
The invention provides a water rock reaction device and a water rock reaction method for simulating atmospheric precipitation fluid and surrounding rock, which have the beneficial effects that: the device can be configured through a fluid injection structure, inject a simulated atmospheric precipitation fluid simulating the temperature and the pressure of a certain depth into the reaction kettle, utilize the simulated atmospheric precipitation fluid to react with a rock sample in the reaction kettle, and monitor a reaction solution after the reaction through a chemical signal acquisition structure; the reaction of the simulated atmospheric precipitation fluid with the temperature and the pressure at different depths and rock samples at different depths can be simulated through multiple experiments, and experimental basis is provided for reservoir transformation and prediction; the method utilizes the device, can simulate the transformation process of atmospheric precipitation fluid on the surrounding rocks of strata at different depths and different positions by configuring simulated atmospheric precipitation fluid for simulating the temperatures and pressures at different depths and utilizing the simulated atmospheric precipitation fluid to carry out a plurality of water-rock reaction experiments with rock samples at different temperatures and pressures, and provides a theoretical basis for the research on the transformation of the atmospheric precipitation fluid on the surrounding rocks.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail exemplary embodiments thereof with reference to the attached drawings, in which like reference numerals generally represent like parts throughout.
Fig. 1 shows a schematic structural diagram of a water-rock reaction device for simulating atmospheric precipitation fluid and surrounding rock according to an embodiment of the invention.
Fig. 2 shows a flow chart of a water-rock reaction method for simulating atmospheric precipitation fluid and surrounding rock according to a second embodiment of the invention.
Description of the reference numerals:
1. a reaction kettle; 2. a fluid injection structure; 3. a chemical signal acquisition structure; 4. a reflow structure; 5. an intermediate container; 6. a first valve; 7. a preheater; 8. a second valve; 9. a gas cylinder; 10. a third valve; 11. a gas booster pump; 12. a pressure vessel; 13. a fourth valve; 14. a first constant pressure constant flow pump; 15. a separator; 16. a back pressure valve; 17. a second constant-pressure constant-flow pump; 18. a fifth valve; 19. and a sixth valve.
Detailed Description
Preferred embodiments of the present invention will be described in more detail below. While the following describes preferred embodiments of the present invention, it should be understood that the present invention may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
The invention provides a water rock reaction device for simulating atmospheric precipitation fluid and surrounding rock, which comprises:
the reaction kettle is provided with a temperature control structure;
the fluid injection structure comprises a fluid configuration component and an injection driving component, wherein the fluid configuration component is connected with the reaction kettle;
the chemical signal acquisition structure is connected with the reaction kettle;
backflow structure, one end and chemical signal acquisition structure are connected, and the other end is connected with the fluid injection structure, and backflow structure can be with the fluid backward flow that detects through the chemical signal acquisition structure to the fluid injection structure in.
Specifically, the fluid injection structure can be used for configuring simulated atmospheric precipitation fluid under the conditions of normal temperature and normal pressure on the ground surface and high temperature and high pressure on a deep stratum through the fluid configuration assembly, the simulated atmospheric precipitation fluid is injected into the reaction kettle through the injection driving assembly and is subjected to water-rock reaction with a rock sample in the reaction kettle, meanwhile, the pressure of the reaction kettle and the pressure of the reaction kettle are controlled through the injection driving assembly, the temperature in the reaction kettle is controlled through the temperature control structure, the rock sample environments on the ground surface and in the deep stratum are simulated in the reaction kettle and are matched with the simulated atmospheric precipitation fluid, the process of transforming the surrounding rock of the depth by the simulated atmospheric precipitation fluid in different stratum depths is realized, and chemical signals in the reacted liquid are monitored in real time through the chemical signal acquisition structure; the reflux structure is arranged, so that a reaction solution produced after the previous water-rock reaction can reflux and reflux to the injection structure, and the next water-rock reaction utilizes the reaction solution refluxed at the previous time, so that the process that atmospheric precipitation fluid flows from a shallow layer to a deep layer to react and reform the surrounding rocks of the strata at different depths can be simulated more accurately, and the experimental result is closer to the real condition; the device can research the process of continuously reforming the carbonate reservoir by the atmospheric precipitation fluid along the fracture downward, explore the rules of mineral dissolution and pore filling in the water-rock reaction process, monitor the trend of reservoir space expansion or reduction under different temperature and pressure conditions, judge the critical point of mineral dissolution and precipitation, and has important scientific significance for monitoring the reforming degree of the atmospheric precipitation fluid in different depth stratums to the reservoir and finding out the interaction rule of the atmospheric precipitation fluid and surrounding rocks; the device has strong practical application significance, can be used in the research fields of reservoir cause, reservoir transformation, reservoir prediction, carbon capture, carbon sequestration and the like, and is convenient to apply and popularize.
Optionally, the temperature control structure comprises a heating jacket, and the heating jacket is sleeved on the outer side of the reaction kettle.
Specifically, the reaction kettle can be heated through the heating sleeve, the high-temperature environment in the deep stratum is simulated in the reaction kettle, and the reaction of surrounding rocks in the deep stratum and water rocks simulating atmospheric precipitation fluid is simulated once.
In one example, the reaction kettle is made of hastelloy materials, and has high strength, acid and alkali corrosion resistance, high temperature resistance and high pressure resistance; the reaction kettle can meet the experimental requirements of high-temperature and high-pressure conditions and different types of fluids.
Optionally, the fluid dispensing assembly comprises:
the intermediate container is connected with the reaction kettle through a first pipeline, and a first valve, a preheater and a second valve are sequentially arranged on the first pipeline from one end close to the intermediate container to one end close to the reaction kettle;
the gas cylinder is connected with the intermediate container through a second pipeline, and a third valve and a gas booster pump are arranged on the second pipeline;
and the pressure container is connected with the intermediate container through a third pipeline, and a fourth valve and a first constant-pressure constant-flow pump are arranged on the third pipeline.
Specifically, the intermediate container is a mixing container of gas in the gas cylinder and liquid in the pressure container, and the pressure in the intermediate container can be controlled by the gas booster pump, and the solution in the intermediate container can be preheated by the preheater.
Optionally, carbon dioxide gas is stored in the gas cylinder, and water is stored in the pressure container.
Specifically, carbon dioxide gas is stored in the gas cylinder, water is stored in the pressure container, the first constant-pressure constant-flow pump can pump water into the intermediate container, and the gas booster pump can pump the carbon dioxide gas into the intermediate container to form carbon dioxide solution in the intermediate container; the pressure in the middle container is controlled through the gas booster pump, the carbon dioxide solution can be preheated through the preheater, the simulated atmospheric precipitation fluid under certain temperature and pressure is formed, and the atmospheric precipitation fluid in a stratum with a certain depth can be simulated.
Optionally, the reflow structure includes:
the input end of the separator is connected with the chemical signal acquisition structure through a fourth pipeline, and a back pressure valve is arranged on the fourth pipeline;
and one end of the second constant-pressure constant-flow pump is connected with the first outlet of the separator, the other end of the second constant-pressure constant-flow pump is connected with the fluid configuration assembly through a fifth pipeline, and a fifth valve is arranged on the fifth pipeline.
Specifically, the separator is a solid-liquid separator capable of separating solids, and the second constant-pressure constant-flow pump can pump liquid back to the intermediate container through the fifth pipeline to realize backflow.
Optionally, a sixth valve is provided on the second outlet of the separator.
In particular, the sixth valve can control the discharge of solids separated by the separator.
Optionally, the injection driving assembly is a first constant-pressure constant-flow pump.
Specifically, regard as injection drive assembly with first constant voltage constant flow pump, first constant voltage constant flow pump not only can pump the water among the pressure vessel into intermediate container, can also pump the carbon dioxide solution in the intermediate container into reation kettle to control the pressure among the reation kettle.
The invention also provides a water rock reaction method for simulating the atmospheric precipitation fluid and the surrounding rock, which utilizes the water rock reaction device for simulating the atmospheric precipitation fluid and the surrounding rock, and comprises the following steps:
disposing a first simulated atmospheric precipitation fluid within a fluid disposition assembly;
injecting a first simulated atmospheric precipitation fluid into a reaction kettle filled with a rock sample;
reacting the first simulated atmospheric precipitation fluid with the rock sample at a first set temperature and a first set pressure;
monitoring a first chemical parameter in a first reaction fluid discharged from the reaction kettle after the first simulated atmospheric precipitation fluid reacts with the rock sample.
Concretely, can dispose first simulation atmosphere precipitation fluid in the fluid configuration subassembly, atmosphere precipitation fluid in the stratum of a degree of depth can be simulated to this fluid, through pouring into drive assembly with the interior pressure of rock sample contact simultaneous control reation kettle with reation kettle of first simulation atmosphere precipitation fluid injection reation kettle, through the temperature in the accuse temperature structure control reation kettle, make temperature and pressure in the reation kettle be first settlement temperature and first settlement pressure respectively, the water rock reaction of duration is set for after temperature and pressure are stable for the first time, utilize chemical signal acquisition structure to gather Ca in the reaction solution that reation kettle flows out after the reaction 2+ Concentration, mg 2+ Concentration, pH, etc.
Optionally, disposing a first simulated atmospheric precipitation fluid within the fluid disposition assembly comprises:
injecting water into the fluid dispensing assembly;
injecting carbon dioxide gas into the fluid configuration assembly filled with water to form a carbon dioxide solution in the fluid configuration assembly;
controlling the pressure of the carbon dioxide solution by controlling the injection amount of the carbon dioxide gas;
and preheating the carbon dioxide solution to form a first simulated atmospheric precipitation fluid.
Specifically, the first simulation atmosphere precipitation fluid is the carbon dioxide solution under the certain temperature and pressure, can pour the water in the pressure vessel into the intermediate container through first constant voltage constant flow pump, can pour the carbon dioxide gas in the gas cylinder into the intermediate container through the gas booster pump, forms the carbon dioxide solution in the intermediate container, can control the pressure of carbon dioxide solution through the gas booster pump, can control the temperature of carbon dioxide solution through the pre-heater.
Optionally, after monitoring the chemical parameter in the reaction fluid discharged from the reaction kettle after the first simulated atmospheric precipitation fluid reacts with the rock sample, the method further comprises:
disposing a second simulated atmospheric precipitation fluid within the fluid disposition assembly;
injecting a second simulated atmospheric precipitation fluid into the reaction kettle;
reacting the second simulated atmospheric precipitation fluid with the rock sample at a second set temperature and a second set pressure;
and monitoring a second chemical parameter in a second reaction fluid discharged from the reaction kettle after the second simulated atmospheric precipitation fluid reacts with the rock sample.
Specifically, after a first simulated atmospheric precipitation fluid is used for reacting with the water rock of the rock sample at a first set temperature and a first set pressure, the temperature and the pressure of the simulated atmospheric precipitation fluid are changed to form a second simulated atmospheric precipitation fluid which can simulate the atmospheric precipitation fluid in the stratum of another depth, the fluid reacts with the water rock of the rock sample at a second set temperature and a second set pressure, the water rock reaction of the second simulated atmospheric precipitation fluid with the surrounding rock in the stratum of another depth is simulated, and the Ca2+ concentration, the Mg2+ concentration, the pH value and the like in a reaction solution flowing out of the reaction kettle after the second reaction are collected by using a chemical signal collection structure; the test result of the second reaction can be compared with the result of the first reaction, so that the analysis and the research are convenient.
In one example, the experiment that water-rock reaction occurs between simulated atmospheric precipitation fluid and rock samples under different set temperatures and set pressures under different pressure and temperature conditions can be carried out for many times, the process that the atmospheric precipitation fluid is transformed from shallow to deep to formation surrounding rocks at different depths can be simulated through the experiment for many times, and a series of analysis and research can be carried out through the experiment results for many times.
Example one
As shown in fig. 1, the present invention provides a water rock reaction device for simulating atmospheric precipitation fluid and surrounding rock, which comprises:
the reaction kettle 1 is provided with a temperature control structure;
the fluid injection structure 2 comprises a fluid configuration component and an injection driving component, and the fluid configuration component 2 is connected with the reaction kettle 1;
the chemical signal acquisition structure 3 is connected with the reaction kettle 1;
backflow structure 4, one end is connected with chemical signal acquisition structure 3, and the other end is connected with fluid injection structure 2, backflow structure 4 can be with the fluid backward flow that detects through chemical signal acquisition structure 3 to fluid injection structure 2 in.
In this embodiment, the temperature control structure includes a heating jacket, and the heating jacket is sleeved on the outer side of the reaction kettle 1.
In this embodiment, the fluid arrangement assembly comprises:
the intermediate container 5 is connected with the reaction kettle 1 through a first pipeline, and a first valve 6, a preheater 7 and a second valve 8 are sequentially arranged on the first pipeline from one end close to the intermediate container 5 to one end close to the reaction kettle 1;
the gas cylinder 9 is connected with the intermediate container 5 through a second pipeline, and a third valve 10 and a gas booster pump 11 are arranged on the second pipeline;
and the pressure container 12 is connected with the intermediate container 5 through a third pipeline, and a fourth valve 13 and a first constant-pressure constant-flow pump 14 are arranged on the third pipeline.
In this embodiment, carbon dioxide gas is stored in the gas cylinder 9, and water is stored in the pressure vessel 12.
In the present embodiment, the reflow structure 4 includes:
the input end of the separator 15 is connected with the chemical signal acquisition structure 3 through a fourth pipeline, and a back-pressure valve 16 is arranged on the fourth pipeline;
and one end of the second constant-pressure constant-flow pump 17 is connected with the first outlet of the separator 15, the other end of the second constant-pressure constant-flow pump is connected with the fluid configuration component through a fifth pipeline, and a fifth valve 18 is arranged on the fifth pipeline.
In this embodiment, a sixth valve 19 is provided on the second outlet of the separator.
In this embodiment, the injection driving component is a first constant-voltage constant-current pump 14.
Example two
As shown in fig. 2, the present invention further provides a water-rock reaction method for simulating atmospheric precipitation fluid and surrounding rock, which uses the water-rock reaction device for simulating atmospheric precipitation fluid and surrounding rock in the first embodiment, and the method includes:
disposing a first simulated atmospheric precipitation fluid within a fluid disposition assembly;
injecting a first simulated atmospheric precipitation fluid into a reaction kettle filled with a rock sample;
reacting the first simulated atmospheric precipitation fluid with the rock sample at a first set temperature and a first set pressure;
monitoring a first chemical parameter in a first reaction fluid discharged from the reaction kettle after the first simulated atmospheric precipitation fluid reacts with the rock sample.
In this embodiment, disposing a first simulated atmospheric precipitation fluid within a fluid disposition assembly comprises:
injecting water into the fluid dispensing assembly;
injecting carbon dioxide gas into the fluid configuration assembly filled with water to form a carbon dioxide solution in the fluid configuration assembly;
controlling the pressure of the carbon dioxide solution by controlling the injection amount of the carbon dioxide gas;
and preheating the carbon dioxide solution to form a first simulated atmospheric precipitation fluid.
In this embodiment, after monitoring the chemical parameter in the reaction fluid discharged from the reaction kettle after the reaction of the first simulated atmospheric precipitation fluid with the rock sample, the method further comprises:
disposing a second simulated atmospheric precipitation fluid within the fluid disposition assembly;
injecting a second simulated atmospheric precipitation fluid into the reaction kettle;
reacting the second simulated atmospheric precipitation fluid with the rock sample at a second set temperature and a second set pressure;
and monitoring a second chemical parameter in a second reaction fluid discharged from the reaction kettle after the second simulated atmospheric precipitation fluid reacts with the rock sample.
In conclusion, the method utilizes the water-rock reaction device for simulating the atmospheric precipitation fluid and the surrounding rock to perform the water-rock reaction, taking the water-rock reaction in rock stratums with two depths as an example, the experimental process is as follows:
(1) Debugging before experiment: opening a first valve 6, a second valve 8, a third valve 10, a fourth valve 13 and a fifth valve 18, injecting water into the whole device, testing the sealing performance, controlling a first constant-pressure constant-flow pump 14 to push the water in a pressure container 12 into an intermediate container 5, heating the water by a preheater 7, then pushing the water to a reaction kettle 1, and testing the concentration of background ions in the water in real time by a chemical signal acquisition structure 3;
(2) Preparation of experimental fluid system: controlling a gas booster pump 11 to push carbon dioxide gas in a gas cylinder 9 into an intermediate container 5, and setting the pressure of the gas booster pump 11 to be 0.1Mpa to obtain a carbon dioxide solution under the surface pressure condition, wherein the carbon dioxide solution is used as simulated atmospheric precipitation fluid on the surface;
(3) First water rock reaction: the rock sample is loaded into a reaction kettle 1, the temperature of a preheater 7 is adjusted to be 20 ℃, simulated atmospheric precipitation fluid on the ground surface is preheated by the preheater 7, the solution in an intermediate container 5 is pumped into the reaction kettle 11 at the speed of 1ml/min by a first constant-pressure constant-flow pump 14 after the temperature and the pressure are stable, a heating jacket of the reaction kettle 1 is adjusted to be 20 ℃, the system pressure is adjusted to be 0.1Mpa by the first constant-pressure constant-flow pump 14 after the temperature and the pressure of the system are stable, a third valve 10, a fourth valve 13, a fifth valve 18 and a sixth valve 19 are closed after the temperature and the pressure of the system are stable, the reaction is started for timing, the fifth valve 18 is opened after the reaction is carried out for 24 hours, the reacted fluid passes through a chemical signal acquisition structure 3, and Ca in the fluid is monitored 2+ Concentration, mg 2+ Concentration and pH value, wherein the reaction fluid separated in the separator 15 flows back to the intermediate container 5 through a second constant-current and constant-pressure pump 17 and a fifth valve 18 for storage, and the first valve 6, the second valve 8 and the fifth valve 18 are closed at the moment;
(4) And (3) second water rock reaction: the temperature of the preheater 7 is adjusted to 50 ℃, and the reaction is adjustedAdjusting the system pressure to 1.1Mpa by a first constant pressure and constant flow pump 14 when the heating jacket of the kettle 1 is 50 ℃, opening a first valve 6 and a second valve 8 after the temperature and the pressure are stable, pumping the solution in an intermediate container 5 into the reaction kettle 1 at the speed of 1ml/min, starting the reaction for timing, opening a fifth valve 18 after the reaction is carried out for 24 hours, monitoring Ca2 in the fluid after the fluid passes through a chemical signal acquisition structure 3 + Concentration, mg 2+ Concentration and pH value, wherein the reaction fluid separated in the separator 15 enters the intermediate container 5 for storage through the second constant-current and constant-pressure pump 17 and the fifth valve 18, the first valve 6, the second valve 8 and the fifth valve 18 are closed to finish simulation of water rock reaction in a bottom layer deeper than the first water rock reaction, and subsequent detection is performed on a sample after the reaction is finished, such as specific surface area, micro morphology, mineral composition and the like;
(5) And (3) data post-processing: based on the obtained post-reaction solution Ca 2+ 、Mg 2+ The ion concentration and the pH value can be calculated, the change trend of the calcium carbonate ion product of the reaction fluid can be calculated, the component change of the fluid moving along the fracture can be estimated, the interaction degree of the fluid and the carbonate rock in the reaction system can be estimated, the relationship among temperature, pressure, fluid, lithology and surrounding rock dissolution and precipitation trends can be explored, the evolution process of holes, holes and seams of reservoir spaces in the reservoir under an open environment can be analyzed according to the subsequent microscopic morphology analysis, mineral composition analysis and CT scanning of samples, and the process of the transformation of atmospheric precipitation fluid on different lithologic strata can be analyzed.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.
Claims (10)
1. A water rock reaction apparatus for simulating atmospheric precipitation fluid reaction with surrounding rock, the apparatus comprising:
the reaction kettle is provided with a temperature control structure;
the fluid injection structure comprises a fluid configuration component and an injection driving component, and the fluid configuration component is connected with the reaction kettle;
the chemical signal acquisition structure is connected with the reaction kettle;
and one end of the backflow structure is connected with the chemical signal acquisition structure, the other end of the backflow structure is connected with the fluid injection structure, and the backflow structure can enable fluid detected by the chemical signal acquisition structure to flow back into the fluid injection structure.
2. The water rock reaction device for simulating atmospheric precipitation fluid and surrounding rock according to claim 1, wherein the temperature control structure comprises a heating jacket, and the heating jacket is sleeved outside the reaction kettle.
3. The water rock reaction apparatus of simulated atmospheric precipitation fluid and surrounding rock of claim 1, wherein said fluid distribution assembly comprises:
the intermediate container is connected with the reaction kettle through a first pipeline, and a first valve, a preheater and a second valve are sequentially arranged on the first pipeline from one end close to the intermediate container to one end close to the reaction kettle;
the gas cylinder is connected with the intermediate container through a second pipeline, and a third valve and a gas booster pump are arranged on the second pipeline;
and the pressure container is connected with the intermediate container through a third pipeline, and a fourth valve and a first constant-pressure constant-flow pump are arranged on the third pipeline.
4. The water-rock reaction device for simulating atmospheric precipitation of fluid and surrounding rock as claimed in claim 3, wherein carbon dioxide gas is stored in the gas cylinder, and water is stored in the pressure vessel.
5. The water rock reaction device of simulated atmospheric precipitation fluid and surrounding rock of claim 1, wherein said flow back structure comprises:
the input end of the separator is connected with the chemical signal acquisition structure through a fourth pipeline, and a back pressure valve is arranged on the fourth pipeline;
and one end of the second constant-pressure constant-flow pump is connected with the first outlet of the separator, the other end of the second constant-pressure constant-flow pump is connected with the fluid configuration assembly through a fifth pipeline, and a fifth valve is arranged on the fifth pipeline.
6. A water rock reaction device for simulating atmospheric precipitation of fluid with surrounding rock according to claim 5, characterized in that a sixth valve is arranged on the second outlet of the separator.
7. The water-rock reaction device for simulating atmospheric precipitation fluid and surrounding rock according to claim 3, wherein the injection driving assembly is the first constant-pressure constant-flow pump.
8. A water-rock reaction method for simulating atmospheric precipitation fluid and surrounding rock, which is implemented by using the water-rock reaction device for simulating atmospheric precipitation fluid and surrounding rock according to any one of claims 1-7, and is characterized in that the method comprises the following steps:
disposing a first simulated atmospheric precipitation fluid within a fluid disposition assembly;
injecting the first simulated atmospheric precipitation fluid into a reaction kettle filled with a rock sample;
reacting the first simulated atmospheric precipitation fluid with the rock sample at a first set temperature and a first set pressure;
and monitoring a first chemical parameter in a first reaction fluid discharged from the reaction kettle after the first simulated atmospheric precipitation fluid reacts with the rock sample.
9. The method of claim 8, wherein the disposing a first simulated atmospheric precipitation fluid within a fluid disposition assembly comprises:
injecting water into the fluid dispensing assembly;
injecting carbon dioxide gas into the fluid configuration assembly filled with water to form a carbon dioxide solution in the fluid configuration assembly;
controlling the pressure of the carbon dioxide solution by controlling the injection amount of the carbon dioxide gas;
preheating the carbon dioxide solution to form the first simulated atmospheric precipitation fluid.
10. The method of claim 9, further comprising, after said monitoring a chemical parameter in a reaction fluid discharged from said autoclave after said first simulated atmospheric precipitation fluid has reacted with said rock sample:
disposing a second simulated atmospheric precipitation fluid within the fluid disposition assembly;
injecting the second simulated atmospheric precipitation fluid into the reaction kettle;
reacting the second simulated atmospheric precipitation fluid with the rock sample at a second set temperature and a second set pressure;
and monitoring a second chemical parameter in a second reaction fluid discharged from the reaction kettle after the second simulated atmospheric precipitation fluid reacts with the rock sample.
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