Water-rock reaction device and method for simulating fluid of atmospheric precipitation and surrounding rock

Abstract

The application discloses a kind of simulation atmospheric precipitation fluid and water-rock reaction device and method of surrounding rock, it is related to water-rock reaction technical field, including: reaction kettle, temperature control structure is arranged on reaction kettle;Fluid injection structure, including fluid configuration component and injection drive component, fluid configuration component is connected with reaction kettle;Chemical signal acquisition structure, connected with reaction kettle;Backflow structure, one end is connected with chemical signal acquisition structure, the other end is connected with fluid injection structure, backflow structure can be detected by chemical signal acquisition structure fluid backflow to fluid injection structure in;The device can be configured by fluid injection structure and inject simulated atmospheric precipitation fluid of the temperature and pressure of simulating a certain depth into reaction kettle, reaction is carried out using simulated atmospheric precipitation fluid and rock sample in reaction kettle, and the reaction solution after reaction is monitored by chemical signal acquisition structure.

Description

Technical Field

[0001] The present invention belongs to the technical field of water-rock reaction, and more specifically, relates to a device and method for simulating water-rock reaction between atmospheric precipitation fluid and surrounding rock. Background Art

[0002] Major petroliferous basins in China have experienced or are currently experiencing alteration by meteoric fluids, which can dissolve and alter reservoirs. Current oil and gas exploration practices have revealed the significant hydrocarbon value of reservoirs altered by meteoric fluids. Meteoric fluids migrate along fracture systems and continuously alter the surrounding rock, improving and enhancing the reservoir properties of the altered surrounding rock. The fluids are primarily derived from meteoric fluids, which may dissolve carbon dioxide and soluble minerals during contact with the surrounding rock. Reservoirs altered by meteoric fluids are widespread, with carbonate formations in the Tarim and Sichuan basins being particularly prominent. These reservoirs have been continuously altered by meteoric fluids from the surface to deep burial. The mechanisms of material and energy changes during fluid-rock interaction, as well as the dissolution and precipitation of the surrounding rock, remain unclear. Therefore, experiments simulating the alteration of surrounding rock by meteoric fluids from the surface to deep formations are needed to clarify this.

[0003] In actual geological environments, as the depth of the formation increases, the corresponding temperature and pressure also increase synchronously. In the atmospheric precipitation fluid surrounding rock experiment that simulates the formation environment, the biggest difficulty is that as the atmospheric precipitation enters the deep formation from the shallow formation, the atmospheric precipitation composition is a dynamic process. The atmospheric precipitation fluid continuously dissolves carbon dioxide and dissolves the mineral components of the surrounding rock, such as salts, gypsum minerals, carbonate minerals, etc. When the carbonate minerals in the fluid are supersaturated, the corresponding minerals will precipitate under appropriate conditions. The atmospheric precipitation fluid surrounding rock experiment that simulates the formation environment is generally a dynamic dissolution and precipitation process of the fluid-rock system containing three variables (temperature, pressure, and minerals). Currently, there is a lack of corresponding equipment and methods to simulate and quantitatively characterize this process.

[0004] Existing water-rock chemical reaction devices mostly use a continuous flow method. A reactor is equipped with a granular rock sample or core sample. The fluid enters the reactor through a pipeline and reacts with the sample for a period of time. After the reaction is completed, the reaction process is calculated and inferred based on the changes in the microscopic morphology and structural composition of the rock sample, as well as the changes in the concentration of ion components in the fluid after the reaction. Because this type of device only has a reactor and a fluid booster pump, it can only simulate water-rock reactions under temperature and pressure conditions at a certain depth, and the reaction pressure conditions are relatively simple. At the same time, due to the lack of a corresponding fluid booster system, it is impossible to prepare atmospheric precipitation fluid corresponding to the formation pressure conditions, and the reaction environment cannot be truly reproduced. However, simply simulating the reaction between atmospheric precipitation fluid and rock under normal temperature and pressure conditions on the surface is obviously unable to meet the current needs of deep exploration and the exploration of the reaction process and reaction mechanism of deep fluids and rocks. Summary of the Invention

[0005] The purpose of the present invention is to address the deficiencies in the prior art and to provide a device and method for simulating the water-rock reaction between atmospheric precipitation fluid and surrounding rock. The device can configure a fluid injection structure and inject simulated atmospheric precipitation fluid at a temperature and pressure simulating a certain depth into a reactor, utilize the simulated atmospheric precipitation fluid to react with rock samples in the reactor, and monitor the reaction solution after the reaction through a chemical signal acquisition structure. Through multiple experiments, the reaction of simulated atmospheric precipitation fluid at temperatures and pressures at different depths with rock samples at different depths can be simulated, providing an experimental basis for reservoir transformation and prediction.

[0006] 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:

[0007] A reactor, wherein the reactor is provided with a temperature control structure;

[0008] A fluid injection structure, comprising a fluid configuration component and an injection drive component, wherein the fluid configuration component is connected to the reactor;

[0009] A chemical signal collection structure connected to the reactor;

[0010] A reflux structure has one end connected to the chemical signal acquisition structure and the other end connected to the fluid injection structure. The reflux structure can return the fluid detected by the chemical signal acquisition structure to the fluid injection structure.

[0011] Optionally, the temperature control structure includes a heating jacket, and the heating jacket is arranged on the outside of the reactor.

[0012] Optionally, the fluid configuration component includes:

[0013] An 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 the end close to the intermediate container to the end close to the reaction kettle;

[0014] A 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;

[0015] A 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.

[0016] Optionally, the gas cylinder stores carbon dioxide gas, and the pressure container stores water.

[0017] Optionally, the reflux structure comprises:

[0018] A separator, an input end of the separator is connected with the chemical signal collection structure through a fourth pipeline, and a back pressure valve is arranged on the fourth pipeline;

[0019] A second constant-pressure constant-flow pump, one end of the second constant-pressure constant-flow pump is connected with a first outlet of the separator, and 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.

[0020] Optionally, a sixth valve is arranged on a second outlet of the separator.

[0021] Optionally, the injection driving assembly is the first constant-pressure constant-flow pump.

[0022] The application further provides a method for simulating water-rock reaction of atmospheric precipitation fluid and surrounding rock, which utilizes the water-rock reaction device for simulating atmospheric precipitation fluid and surrounding rock, and the method comprises the following steps:

[0023] Configuring a first simulated atmospheric precipitation fluid in a fluid configuration assembly;

[0024] Injecting the first simulated atmospheric precipitation fluid into a reaction kettle filled with a rock sample;

[0025] Reacting the first simulated atmospheric precipitation fluid with the rock sample at a first set temperature and a first set pressure;

[0026] 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.

[0027] Optionally, the step of configuring a first simulated atmospheric precipitation fluid in a fluid configuration assembly comprises:

[0028] Injecting water into the fluid configuration assembly;

[0029] injecting carbon dioxide gas into the fluid configuration component containing water to form a carbon dioxide solution in the fluid configuration component;

[0030] controlling the pressure of the carbon dioxide solution by controlling the injection amount of the carbon dioxide gas;

[0031] The carbon dioxide solution is preheated to form the first simulated atmospheric precipitation fluid.

[0032] Optionally, after monitoring the chemical parameters of the reaction fluid discharged from the reactor after the first simulated atmospheric precipitation fluid reacts with the rock sample, the method further includes:

[0033] disposing a second simulated atmospheric precipitation fluid in the fluid disposing component;

[0034] injecting the second simulated atmospheric precipitation fluid into the reactor;

[0035] allowing the second simulated atmospheric precipitation fluid to react with the rock sample at a second set temperature and a second set pressure;

[0036] A second chemical parameter in the second reaction fluid discharged from the reactor after the second simulated atmospheric precipitation fluid reacts with the rock sample is monitored.

[0037] The present invention provides a device and method for simulating water-rock reaction between atmospheric precipitation fluid and surrounding rock. The device has the following beneficial effects: the device can inject simulated atmospheric precipitation fluid simulating the temperature and pressure of a certain depth into a reactor through a fluid injection structure, react with the rock sample in the reactor using the simulated atmospheric precipitation fluid, and monitor the reaction solution after the reaction through a chemical signal acquisition structure; the reaction between the simulated atmospheric precipitation fluid at different temperatures and pressures and the rock samples at different depths can be simulated through multiple experiments, providing an experimental basis for reservoir transformation and prediction; the method can utilize the device to configure simulated atmospheric precipitation fluid at different temperatures and pressures, and use the simulated atmospheric precipitation fluid to conduct multiple water-rock reaction experiments with rock samples at different temperatures and pressures, thereby realizing the transformation process of the simulated atmospheric precipitation fluid on the surrounding rock at different depths and layers, and providing a theoretical basis for research on the transformation of the surrounding rock by the atmospheric precipitation fluid.

[0038] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings, wherein like reference numerals generally represent like components throughout the exemplary embodiments of the present invention.

[0040] Figure 1 A schematic structural diagram of a device for simulating water-rock reaction between atmospheric precipitation fluid and surrounding rock according to the first embodiment of the present invention is shown.

[0041] Figure 2 A flow chart of a method for simulating water-rock reaction between atmospheric precipitation fluid and surrounding rock according to embodiment 2 of the present invention is shown.

[0042] Description of reference numerals:

[0043] 1. Reactor; 2. Fluid injection structure; 3. Chemical signal acquisition structure; 4. Reflux structure; 5. Intermediate container; 6. First valve; 7. Preheater; 8. Second valve; 9. Gas cylinder; 10. Third valve; 11. Gas booster pump; 12. Pressure vessel; 13. Fourth valve; 14. First constant-pressure and constant-flow pump; 15. Separator; 16. Back-pressure valve; 17. Second constant-pressure and constant-flow pump; 18. Fifth valve; 19. Sixth valve. DETAILED DESCRIPTION

[0044] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. Instead, these embodiments are provided to make the present invention more thorough and complete and to fully convey the scope of the present invention to those skilled in the art.

[0045] The present invention provides a water-rock reaction device for simulating atmospheric precipitation fluid and surrounding rock, the device comprising:

[0046] A reactor is provided with a temperature control structure;

[0047] The fluid injection structure includes a fluid configuration component and an injection drive component, wherein the fluid configuration component is connected to the reactor;

[0048] A chemical signal collection structure connected to the reactor;

[0049] The reflux structure has one end connected to the chemical signal acquisition structure and the other end connected to the fluid injection structure. The reflux structure can return the fluid detected by the chemical signal acquisition structure to the fluid injection structure.

[0050] Specifically, the fluid injection structure can configure simulated atmospheric precipitation fluid under normal surface temperature and pressure conditions and high temperature and high pressure conditions in deep formations through the fluid configuration component, and inject the simulated atmospheric precipitation fluid into the reactor through the injection drive component to react with the rock sample in the reactor. At the same time, the pressure of the reactor is controlled by the injection drive component, and the temperature in the reactor is controlled by the temperature control structure, so as to simulate the rock sample environment at the surface and in deep formations in the reactor, and cooperate with the simulated atmospheric precipitation fluid to realize the process of transforming the surrounding rock at different formation depths by the simulated atmospheric precipitation fluid at that depth, and use the chemical signal acquisition structure to monitor the chemical signals in the liquid after the reaction in real time; the setting of the reflux structure enables the reaction solution produced after the previous water-rock reaction to flow back to the fluid injection structure, and the next water The rock reaction uses the reaction solution of the previous reflux to more accurately simulate the process of atmospheric precipitation fluid flowing from shallow to deep strata, reacting and transforming the surrounding rocks of strata at different depths, making the experimental results closer to the actual situation; the device can study the process of atmospheric precipitation fluid continuously transforming carbonate reservoirs along the downward direction of the fault, explore the laws of mineral dissolution and pore filling in the water-rock reaction process, monitor the trend of expansion or contraction of the reservoir space under different temperature and pressure conditions, and judge the critical point of mineral dissolution and precipitation. It has important scientific significance for monitoring the degree of transformation of reservoirs by atmospheric precipitation fluids at different depths and finding out the interaction laws between atmospheric precipitation fluids and surrounding rocks; the device has strong practical application significance and can be used in research fields such as reservoir genesis, reservoir transformation, reservoir prediction, carbon capture and carbon storage, and is easy to apply and promote.

[0051] Optionally, the temperature control structure includes a heating jacket, which is arranged on the outside of the reactor.

[0052] Specifically, the reactor can be heated by the heating jacket to simulate the high temperature environment in the deep stratum in the reactor, thereby simulating the water-rock reaction between the surrounding rock in the deep stratum and the simulated atmospheric precipitation fluid.

[0053] In one example, the reactor is made of Hastelloy material, which is high-strength, resistant to acid and alkali corrosion, high temperature and high pressure. The reactor itself can meet the experimental needs of high temperature and high pressure conditions and different types of fluids.

[0054] Optionally, the fluid configuration component includes:

[0055] The intermediate container is connected to the reactor through a first pipeline, and the first pipeline is provided with a first valve, a preheater, and a second valve in sequence from an end close to the intermediate container to an end close to the reactor;

[0056] The gas cylinder is connected to the intermediate container via a second pipeline, and a third valve and a gas booster pump are provided on the second pipeline;

[0057] The pressure container is connected to the intermediate container through a third pipeline, and the third pipeline is provided with a fourth valve and a first constant pressure and constant flow pump.

[0058] Specifically, the intermediate container serves as a mixing container for the gas in the gas cylinder and the liquid in the pressure vessel. The pressure in the intermediate container can be controlled by a gas booster pump, and the solution in the intermediate container can be preheated by a preheater.

[0059] Optionally, carbon dioxide gas is stored in the gas cylinder, and water is stored in the pressure container.

[0060] Specifically, carbon dioxide gas is stored in the gas cylinder, water is stored in the pressure vessel, a first constant pressure and constant flow pump can pump water into the intermediate container, and a gas booster pump can pump carbon dioxide gas into the intermediate container to form a carbon dioxide solution in the intermediate container; the pressure in the intermediate container is controlled by the gas booster pump, and the carbon dioxide solution can be preheated by the preheater to form a simulated atmospheric precipitation fluid at a certain temperature and pressure, which can simulate the atmospheric precipitation fluid in a certain depth formation.

[0061] Optionally, the reflux structure includes:

[0062] A separator, wherein the input end of the separator is connected to the chemical signal acquisition structure through a fourth pipeline, and a back pressure valve is provided on the fourth pipeline;

[0063] The second constant pressure and constant flow pump has one end connected to the first outlet of the separator and the other end connected to the fluid configuration component through a fifth pipeline, and a fifth valve is provided on the fifth pipeline.

[0064] Specifically, the separator is a solid-liquid separator, which can separate solids, and the second constant pressure and constant flow pump can pump the liquid back into the intermediate container through the fifth pipeline to achieve reflux.

[0065] Optionally, a sixth valve is provided on the second outlet of the separator.

[0066] Specifically, the sixth valve can control the discharge of the solids separated by the separator.

[0067] Optionally, the injection drive component is a first constant pressure and constant flow pump.

[0068] Specifically, the first constant pressure and constant flow pump is used as the injection drive component. The first constant pressure and constant flow pump can not only pump the water in the pressure vessel into the intermediate container, but also pump the carbon dioxide solution in the intermediate container into the reactor and control the pressure in the reactor.

[0069] The present invention also provides a method for simulating water-rock reaction between atmospheric precipitation fluid and surrounding rock, using the above-mentioned water-rock reaction device for simulating atmospheric precipitation fluid and surrounding rock, the method comprises:

[0070] configuring a first simulated atmospheric precipitation fluid in a fluid configuration assembly;

[0071] injecting the first simulated atmospheric precipitation fluid into a reactor filled with a rock sample;

[0072] reacting the first simulated atmospheric precipitation fluid with the rock sample at a first set temperature and a first set pressure;

[0073] monitoring a first chemical parameter in a first reaction fluid discharged from the reactor after the first simulated atmospheric precipitation fluid reacts with the rock sample.

[0074] Specifically, the fluid configuration assembly is configured to configure a first simulated atmospheric precipitation fluid, which can simulate atmospheric precipitation fluid in a formation at a certain depth. The first simulated atmospheric precipitation fluid is injected into the reactor through an injection driving assembly to contact a rock sample in the reactor while controlling the pressure in the reactor. The temperature in the reactor is controlled by a temperature control structure, so that the temperature and pressure in the reactor are a first set temperature and a first set pressure, respectively. After the temperature and pressure are stabilized, a water-rock reaction is carried out for a first set time. A chemical signal collection structure is used to collect Ca 2+ concentration, Mg 2+ concentration, pH value, etc.

[0075] Optionally, configuring the first simulated atmospheric precipitation fluid in the fluid configuration assembly comprises:

[0076] injecting water into the fluid configuration assembly;

[0077] injecting carbon dioxide gas into the fluid configuration assembly containing water to form a carbon dioxide solution in the fluid configuration assembly;

[0078] controlling the pressure of the carbon dioxide solution by controlling the injection amount of the carbon dioxide gas;

[0079] preheating the carbon dioxide solution to form the first simulated atmospheric precipitation fluid.

[0080] Specifically, the first simulated atmospheric precipitation fluid is a carbon dioxide solution at a certain temperature and pressure. A first constant-pressure constant-flow pump can inject water in a pressure container into an intermediate container. A gas booster pump can inject carbon dioxide gas in a gas cylinder into the intermediate container to form a carbon dioxide solution in the intermediate container. The gas booster pump can control the pressure of the carbon dioxide solution. A preheater can control the temperature of the carbon dioxide solution.

[0081] Optionally, after monitoring the chemical parameter in the reaction fluid discharged from the reactor after the first simulated atmospheric precipitation fluid reacts with the rock sample, the method further comprises:

[0082] configuring a second simulated atmospheric precipitation fluid in the fluid configuration assembly;

[0083] injecting a second simulated atmospheric precipitation fluid into the reactor;

[0084] reacting a second simulated atmospheric precipitation fluid with the rock sample at a second set temperature and a second set pressure;

[0085] A second chemical parameter in the second reaction fluid discharged from the reactor after the second simulated atmospheric precipitation fluid reacts with the rock sample is monitored.

[0086] Specifically, after the water-rock reaction of the first simulated atmospheric precipitation fluid with the rock sample at the first set temperature and the first set pressure, the temperature and 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 a formation at another depth. The fluid undergoes a water-rock reaction with the rock sample at the second set temperature and the second set pressure, simulating the water-rock reaction of the second simulated atmospheric precipitation fluid with the surrounding rock in a formation at another depth. The chemical signal acquisition structure is used to collect the Ca2+ concentration, Mg2+ concentration, pH value, etc. in the reaction solution flowing out of the reactor after the second reaction; the test results of the second reaction can be compared with the results of the first reaction, which is convenient for analysis and research.

[0087] In one example, multiple experiments can be conducted to simulate the water-rock reaction between atmospheric precipitation fluids under different pressure and temperature conditions and rock samples under different set temperatures and set pressures. Through such experiments, the process of atmospheric precipitation fluids transforming surrounding rocks at different depths from shallow to deep can be simulated, and a series of analyses and studies can be conducted based on the results of multiple experiments.

[0088] Example 1

[0089] like Figure 1 As shown, the present invention provides a water-rock reaction device for simulating atmospheric precipitation fluid and surrounding rock, the device comprising:

[0090] Reactor 1, reactor 1 is provided with a temperature control structure;

[0091] The fluid injection structure 2 includes a fluid configuration component and an injection drive component, and the fluid configuration component 2 is connected to the reactor 1;

[0092] The chemical signal collection structure 3 is connected to the reactor 1;

[0093] The reflux structure 4 is connected to the chemical signal collection structure 3 at one end and to the fluid injection structure 2 at the other end. The reflux structure 4 can return the fluid detected by the chemical signal collection structure 3 to the fluid injection structure 2 .

[0094] In this embodiment, the temperature control structure includes a heating jacket, which is arranged on the outside of the reactor 1 .

[0095] In the embodiment, the fluid configuration assembly comprises:

[0096] an intermediate container 5 connected with the reaction kettle 1 through a first pipeline, wherein the first pipeline is sequentially provided with a first valve 6, a preheater 7 and a second valve 8 from an end close to the intermediate container 5 to an end close to the reaction kettle 1;

[0097] a gas cylinder 9 connected with the intermediate container 5 through a second pipeline, wherein the second pipeline is provided with a third valve 10 and a gas booster pump 11;

[0098] a pressure container 12 connected with the intermediate container 5 through a third pipeline, wherein the third pipeline is provided with a fourth valve 13 and a first constant pressure and flow pump 14.

[0099] In the embodiment, the gas cylinder 9 stores carbon dioxide gas, and the pressure container 12 stores water.

[0100] In the embodiment, the reflux structure 4 comprises:

[0101] a separator 15, wherein an input end of the separator 15 is connected with the chemical signal collection structure 3 through a fourth pipeline, and the fourth pipeline is provided with a back pressure valve 16;

[0102] a second constant pressure and flow pump 17, wherein one end of the second constant pressure and flow pump 17 is connected with a first outlet of the separator 15, and the other end of the second constant pressure and flow pump 17 is connected with the fluid configuration assembly through a fifth pipeline, and the fifth pipeline is provided with a fifth valve 18.

[0103] In the embodiment, a sixth valve 19 is arranged on a second outlet of the separator.

[0104] In the embodiment, the injection driving assembly is the first constant pressure and flow pump 14.

[0105] Embodiment two

[0106] As shown in Figure 2 the present application also provides a method for simulating water-rock reaction of atmospheric precipitation fluid and surrounding rock, which utilizes the water-rock reaction device for simulating atmospheric precipitation fluid and surrounding rock in the embodiment one, and the method comprises the following steps:

[0107] configuring a first simulated atmospheric precipitation fluid in the fluid configuration assembly;

[0108] injecting the first simulated atmospheric precipitation fluid into the reaction kettle filled with a rock sample;

[0109] reacting the first simulated atmospheric precipitation fluid with the rock sample under a first set temperature and a first set pressure;

[0110] 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.

[0111] In the present embodiment, configuring the first simulated atmospheric precipitation fluid in the fluid configuration assembly comprises:

[0112] injecting water into the fluid configuration assembly;

[0113] injecting carbon dioxide gas into the fluid configuration assembly containing water, forming a carbon dioxide solution in the fluid configuration assembly;

[0114] controlling the pressure of the carbon dioxide solution by controlling the amount of carbon dioxide gas injected;

[0115] preheating the carbon dioxide solution to form the first simulated atmospheric precipitation fluid.

[0116] In the present embodiment, after monitoring the chemical parameters 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:

[0117] configuring a second simulated atmospheric precipitation fluid in the fluid configuration assembly;

[0118] injecting the second simulated atmospheric precipitation fluid into the reaction kettle;

[0119] reacting the second simulated atmospheric precipitation fluid with the rock sample at a second set temperature and a second set pressure;

[0120] monitoring the second chemical parameters in the second reaction fluid discharged from the reaction kettle after the second simulated atmospheric precipitation fluid reacts with the rock sample.

[0121] In summary, the method uses the water-rock reaction device for simulating atmospheric precipitation fluid and surrounding rock to perform water-rock reaction, and takes the water-rock reaction in two depth rock layers as an example. The experimental process is as follows:

[0122] (1) Pre-experiment debugging: open the first valve 6, the second valve 8, the third valve 10, the fourth valve 13 and the fifth valve 18, inject water into the entire device, test the sealing performance, control the first constant pressure and constant flow pump 14 to push the water in the pressure container 12 into the intermediate container 5, and then heat it through the preheater 7 and push it to the reaction kettle 1, and test the concentration of background ions in the water in real time through the chemical signal acquisition structure 3;

[0123] (2) Experimental fluid system preparation: control the gas booster pump 11 to push the carbon dioxide gas in the gas cylinder 9 into the intermediate container 5, and set the pressure of the gas booster pump 11 to 0.1 Mpa, so as to obtain the carbon dioxide solution under the surface pressure condition, which is used as the simulated atmospheric precipitation fluid on the ground;

[0124] (3) First water-rock reaction: The rock sample is placed in the reactor 1, and the temperature of the preheater 7 is adjusted to 20°C. The simulated atmospheric precipitation fluid on the surface is preheated by the preheater 7. After the temperature and pressure are stabilized, the solution in the intermediate container 5 is pumped into the reactor 11 at a rate of 1 ml / min through the first constant pressure and constant flow pump 14. The heating jacket of the reactor 1 is adjusted to 20°C. The system pressure is adjusted to 0.1 MPa through the first constant pressure and constant flow pump 14. After the system temperature and pressure are stabilized, the third valve 10, the fourth valve 13, the fifth valve 18 and the sixth valve 19 are closed, and the reaction timer is started. After 24 hours of reaction, the fifth valve 18 is opened, and the reacted fluid passes through the chemical signal acquisition structure 3 to monitor the Ca content in the fluid. 2+ concentration, Mg 2+ Concentration, pH value, the reaction fluid after separation in the separator 15 is refluxed into the intermediate container 5 through the second constant flow constant pressure pump 17 and the fifth valve 18 for storage, at this time the first valve 6, the second valve 8 and the fifth valve 18 are closed;

[0125] (4) Second water-rock reaction: adjust the temperature of the preheater 7 to 50°C, adjust the heating jacket of the reactor 1 to 50°C, adjust the system pressure to 1.1 MPa through the first constant pressure and constant flow pump 14, open the first valve 6 and the second valve 8 after the temperature and pressure are stable, and pump the solution in the intermediate container 5 into the reactor 1 at a rate of 1 ml / min. Start the reaction timer. After 24 hours of reaction, open the fifth valve 18. The reacted fluid passes through the chemical signal acquisition structure 3 to monitor the Ca2 + concentration, Mg 2+ Concentration, pH value, the reaction fluid after separation in the separator 15 passes through the second constant flow constant pressure pump 17 and the fifth valve 18 into the intermediate container 5 for storage, the first valve 6, the second valve 8 and the fifth valve 18 are closed to complete the simulation of the water-rock reaction in the bottom layer deeper than the first water-rock reaction. After the reaction is completed, the sample is subjected to subsequent testing, such as specific surface area, microscopic morphology, mineral composition, etc.;

[0126] (5) Data post-processing: Based on the obtained post-reaction solution Ca 2+ Mg 2+ Ion concentration and pH value can be used to calculate the changing trend of calcium carbonate ion product of reaction fluid, estimate the composition change of fluid migrating along faults, evaluate the degree of interaction between fluid and carbonate rock in the reaction system, explore the relationship between temperature, pressure, fluid, lithology and surrounding rock dissolution and precipitation trends, and based on the subsequent microscopic morphology analysis, mineral composition analysis and CT scanning of samples, analyze the evolution process of storage space pores, holes and fractures in reservoirs under open environment, and analyze the process of transformation of different lithologic strata by meteoric precipitation fluids.

[0127] While various embodiments of the present invention have been described above, the above description is intended to be illustrative, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A method for simulating water-rock reaction between atmospheric precipitation fluid and surrounding rock, using a water-rock reaction device for simulating atmospheric precipitation fluid and surrounding rock, characterized in that: The device includes: A reactor, wherein the reactor is provided with a temperature control structure; A fluid injection structure, comprising a fluid configuration component and an injection drive component, wherein the fluid configuration component is connected to the reactor; A chemical signal collection structure connected to the reactor; a reflux structure, one end of which is connected to the chemical signal acquisition structure, and the other end of which is connected to the fluid injection structure, wherein the reflux structure is capable of returning the fluid detected by the chemical signal acquisition structure to the fluid injection structure; The reflux structure includes: a separator, wherein an input end of the separator is connected to the chemical signal acquisition structure via a fourth pipeline, and a back pressure valve is provided on the fourth pipeline; a second constant pressure and constant flow pump, one end of which is connected to the first outlet of the separator, and the other end of which is connected to the fluid configuration component via a fifth pipeline, wherein a fifth valve is provided on the fifth pipeline; The method includes: disposing a first simulated atmospheric precipitation fluid in the fluid disposing component; injecting the first simulated atmospheric precipitation fluid into a reactor filled with a rock sample; allowing the first simulated atmospheric precipitation fluid to react 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 reactor after the first simulated atmospheric precipitation fluid reacts with the rock sample; The reaction fluid after the first reaction fluid is separated in the separator flows back into the fluid configuration component through the second constant flow and constant pressure pump and the fifth valve; disposing a second simulated atmospheric precipitation fluid in the fluid disposing component; injecting the second simulated atmospheric precipitation fluid into the reactor; allowing the second simulated atmospheric precipitation fluid to react with the rock sample at a second set temperature and a second set pressure; A second chemical parameter in the second reaction fluid discharged from the reactor after the second simulated atmospheric precipitation fluid reacts with the rock sample is monitored.

2. The method for simulating water-rock reaction between atmospheric precipitation fluid and surrounding rock according to claim 1, characterized in that: The temperature control structure includes a heating jacket, which is arranged on the outside of the reactor.

3. The method for simulating water-rock reaction between atmospheric precipitation fluid and surrounding rock according to claim 1, characterized in that: The fluid configuration assembly comprises: An intermediate container is connected to the reactor via a first pipeline, wherein the first pipeline is provided with a first valve, a preheater, and a second valve in sequence from an end close to the intermediate container to an end close to the reactor; a gas cylinder connected to the intermediate container via a second pipeline, wherein the second pipeline is provided with a third valve and a gas booster pump; The pressure container is connected to the intermediate container through a third pipeline, and the third pipeline is provided with a fourth valve and a first constant pressure and constant flow pump.

4. The method for simulating water-rock reaction between atmospheric precipitation fluid and surrounding rock according to claim 3, characterized in that: Carbon dioxide gas is stored in the gas cylinder, and water is stored in the pressure container.

5. The method for simulating water-rock reaction between atmospheric precipitation fluid and surrounding rock according to claim 1, characterized in that: A sixth valve is provided on the second outlet of the separator.

6. The method for simulating water-rock reaction between atmospheric precipitation fluid and surrounding rock according to claim 3, characterized in that: The injection drive component is the first constant pressure and constant current pump.

7. The method for simulating water-rock reaction between atmospheric precipitation fluid and surrounding rock according to claim 1, characterized in that: The configuring of the first simulated atmospheric precipitation fluid in the fluid configuration component comprises: injecting water into the fluid configuration component; injecting carbon dioxide gas into the fluid configuration component containing water to form a carbon dioxide solution in the fluid configuration component; controlling the pressure of the carbon dioxide solution by controlling the injection amount of the carbon dioxide gas; The carbon dioxide solution is preheated to form the first simulated atmospheric precipitation fluid.

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