An intelligent simulation device for monitoring carbonate rock water corrosion using a temperature controller

Abstract

The application provides an intelligent simulation device for monitoring water-rock karst corrosion of carbonate rocks by using a temperature controller, comprising a reaction kettle, a heat insulation layer and a working chamber are arranged in the reaction kettle, an L-shaped liquid-gas containing cavity, a first reaction chamber, a heating chamber and a second reaction chamber are arranged in the working chamber; a temperature sensor and a pressure sensor are arranged in the L-shaped liquid-gas containing cavity, and the temperature sensor and the pressure sensor are electrically connected with the temperature controller; a heating wire is arranged in the heating chamber, and the heating wire is electrically connected with a heating switch button; slidable core clamps are arranged on the two sides of the first reaction chamber and the second reaction chamber, and are used for clamping carbonate rock samples; the detection technology of the high-precision temperature controller, the temperature sensor, the pressure sensor and the differential pressure sensor is combined, the test quality of the reaction kettle is improved, the carbonate rock water-rock karst corrosion simulation test can provide more accurate and reliable results under various environments, and time is saved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of dissolution experiment, and particularly relates to an intelligent simulation device for monitoring water-rock dissolution of carbonatite by using a temperature controller. BACKGROUND

[0002] Dolomite is a key area of deep oil and gas exploration. China's ancient dolomite strata have undergone deep burial, high temperature and high pressure, and long-term diagenetic superimposed modification, and have formed secondary pores and caves through various dissolution to become important oil and gas reservoir spaces. Oil and gas production also reveals that the development degree of dissolution pores and caves is one of the important factors controlling oil and gas production. Therefore, revealing the formation mechanism and evolution process of dissolution pores and caves is crucial for predicting the distribution of high-quality dolomite reservoirs.

[0003] There are two mechanisms for the formation of dissolution pores and caves: one is atmospheric water dissolution in the early diagenetic or supergene period; the other is burial dissolution. Burial dissolution has particularity, and the dissolution pores or caves are end products, and there is no corresponding diagenetic product that can be used to directly analyze the conditions under which they occur, so there has been controversy about the formation mechanism for a long time. Dissolution simulation experiment provides an effective research means for the occurrence conditions and dissolution process of dissolution.

[0004] Since the 1960s, domestic and foreign scholars have used experimental methods to carry out research on exploring the dissolution mechanism of carbonate rocks. With the discovery of a large number of deep buried carbonate oil and gas reservoirs, the research on the dissolution mechanism of carbonate rocks under high temperature and high pressure has become the focus of simulation experiments, and the experimental conditions have naturally developed from low temperature and low pressure to high temperature and high pressure environment, and the experimental samples have gradually been replaced by carbonate rock samples instead of single mineral samples such as calcite and dolomite. These studies have promoted the deep understanding of the geological knowledge of the dissolution response of dolomite under deep burial conditions, but the control of dolomite crystal characteristics on dissolution and the formation process of dissolution pores and caves are still unclear, and further research is needed. SUMMARY

[0005] The application provides an intelligent simulation device for monitoring water-rock dissolution of carbonate rocks by using a temperature controller, which selects a large number of developed grain dolomite in deep layers, carries out high temperature and high pressure dissolution simulation experiments on carbonate rock samples, and explores the formation and evolution process of dolomite pores to determine the dissolution amount and dissolution effect under different diagenetic environments.

[0006] To solve the above problems, the technical scheme provided by the application is as follows:

[0007] The embodiment of the present application provides an intelligent simulation device for monitoring water-rock karst corrosion of carbonate rocks by using a temperature controller, which comprises a reaction kettle, wherein the reaction kettle is a box structure, a main feed inlet is arranged on the top surface of the reaction kettle, an auxiliary feed inlet is arranged on the left side surface of the reaction kettle, and a window, a temperature controller and a heating switch button are arranged on the front side surface of the reaction kettle.

[0008] A heat insulation layer and a working chamber are arranged in the reaction kettle, the working chamber is internally provided with an L-shaped liquid-gas containing cavity, a first reaction chamber, a heating chamber and a second reaction chamber, temperature sensors and pressure sensors are arranged in the L-shaped liquid-gas containing cavity, the temperature sensors and the pressure sensors are electrically connected with the temperature controller, the first reaction chamber and the second reaction chamber are arranged on the two sides of the heating chamber, heating wires are arranged in the heating chamber, and the heating wires are electrically connected with the heating switch button, slidable first core clamps are arranged on the two sides of the first reaction chamber and used for clamping first carbonate rock samples, slidable second core clamps are arranged on the two sides of the second reaction chamber and used for clamping second carbonate rock samples, and backflow ports are arranged on the right side surfaces of the first reaction chamber and the second reaction chamber.

[0009] First, second and third outlets are arranged at the bottom of the L-shaped liquid-gas containing cavity, a differential pressure sensor is connected with the first outlet through a fifth pipeline, so that the liquid permeability value of the carbonate rock sample in the water-rock reaction process can be measured in real time and on line, the range of the differential pressure sensor is 0.1-10000*10 -3 μm 2 ; a sampler is connected with the second outlet through a sixth pipeline, and the third outlet is connected with the backflow port through a seventh pipeline, a back pressure pump and an eighth pipeline.

[0010] In an optional embodiment of the present application, the first core clamp and the second reaction chamber both comprise a hydraulic rod and a piston connected with the hydraulic rod, and the cross-sectional size of the piston is the same as the cross-sectional size of the cavity of the reaction chamber.

[0011] In an optional embodiment of the present application, the differential pressure sensor is electrically connected with the temperature controller, and the temperature controller is further used for displaying the measurement value of the differential pressure sensor in real time.

[0012] In an optional embodiment of the present application, the back pressure pump adopts a high-precision high-pressure plunger pump, which is used for driving the solution in the L-shaped liquid-gas containing cavity to flow, so that the fluid circulation flow under high temperature and high pressure is realized.

[0013] The water container is connected with the double-piston pump through a first pipeline, the double-piston pump is connected with the pressure container through a second pipeline, the gas cylinder is connected with the pressure container through a third pipeline, and the pressure container is connected with the main feeding port through a fourth pipeline.

[0014] In an optional embodiment of the present application, the first pipeline to the eighth pipeline are provided with valves.

[0015] In an optional embodiment of the present application, the water container is added with a fluid, the medium of the fluid is organic acetic acid in oilfield water, and the concentration of the organic acetic acid is selected as one of 2 g / L, 4 g / L, 5 g / L, 6 g / L and 8 g / L; the fluid is further added with sodium sulfate, calcium chloride and magnesium chloride; and the gas cylinder is provided with carbon dioxide gas.

[0016] In an optional embodiment of the present application, the temperature range in the first reaction chamber and the second reaction chamber is normal temperature to 400 DEG C, the pressure range therein is normal pressure to 100 MPa, and the fluid flow rate therein is 0.1-10 mL / S.

[0017] Compared with the prior art, the embodiment of the present application provides an intelligent simulation device for monitoring carbonate rock water-rock dissolution by using a temperature controller, which has at least the following beneficial effects: (1) the present application combines the detection technology of high-precision temperature controller, temperature sensor, pressure sensor and differential pressure sensor to improve the test quality of the reaction kettle, so that the carbonate rock water-rock dissolution simulation test can provide more accurate and reliable results under various environments, saving time; (2) by simulating high temperature, high pressure and high salinity fluid, the quantitative simulation of the dissolution effect of carbonate rock formation in the process of continuous deep burial under geological conditions is realized, and the pore-forming peak period conducive to the burial dissolution of carbonate rock is analyzed; (3) by the rock internal dissolution experiment, the burial dissolution of different pore type carbonate rocks is simulated, and the porosity value, permeability value and evolution of rock internal pore structure before and after the test sample dissolution, as well as the real-time evolution of liquid permeability in the dissolution process are utilized to analyze the burial dissolution pore evolution path and dissolution effect quantitative evaluation of carbonate rock. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments or the prior art, the drawings needed to be used in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0019] Figure 1A reaction kettle appearance schematic diagram of an intelligent simulation device for monitoring carbonate rock water-rock karst corrosion by using a temperature controller is provided for the embodiment of the present application.

[0020] Figure 2 A reaction kettle internal schematic diagram of an intelligent simulation device for monitoring carbonate rock water-rock karst corrosion by using a temperature controller is provided for the embodiment of the present application.

[0021] Figure 3 A schematic diagram of an intelligent simulation device for monitoring carbonate rock water-rock karst corrosion by using a temperature controller is provided for the embodiment of the present application. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0023] As shown in Figure 1 , Figure 2 and Figure 3 , the present embodiment provides an intelligent simulation device for monitoring carbonate rock water-rock karst corrosion by using a temperature controller, which comprises a reaction kettle 1. The reaction kettle 1 is a box structure. A main feed inlet 1-4 is arranged on the top surface 1-1 of the reaction kettle 1. An auxiliary feed inlet 1-5 is arranged on the left side surface 1-2 of the reaction kettle 1. A window 1-6, a temperature controller 1-7 and a heating switch button 1-8 are arranged on the front side surface of the reaction kettle 1.

[0024] A heat insulation layer 2 and a working chamber are arranged in the reaction kettle 1. The working chamber is internally provided with an L-shaped liquid-gas containing cavity 3, a first reaction chamber 4, a heating chamber 5 and a second reaction chamber 6. A temperature sensor 11 and a pressure sensor 12 are arranged in the L-shaped liquid-gas containing cavity 3. The temperature sensor 11 and the pressure sensor 12 are electrically connected with the temperature controller 1-7. The first reaction chamber 4 and the second reaction chamber 6 are arranged on both sides of the heating chamber 5. A heating wire 5-1 is arranged in the heating chamber 5. The heating wire 5-1 is electrically connected with the heating switch button 1-8. The temperature controller 1-7 is a preset upper threshold value of the current test temperature. When the preset temperature is reached, the heating switch button 1-8 is controlled to stop heating. The temperature controller 1-7 also displays the current temperature and the preset upper temperature limit value in real time.

[0025] Slidable first core clamps 7 are arranged on both sides of the first reaction chamber 4, which are used for clamping a first carbonate rock sample 4-1. Slidable second core clamps 8 are arranged on both sides of the second reaction chamber 6, which are used for clamping a second carbonate rock sample 6-1. A reflux port 1-9 is arranged on the right side surface of each of the first reaction chamber 4 and the second reaction chamber 6.

[0026] The L-shaped liquid-gas containing cavity 3 is provided with a high-temperature and high-pressure resistant rubber layer 9 around the cavity. The L-shaped liquid-gas containing cavity 3 is provided with a first outlet 13, a second outlet 14 and a third outlet 15 at the bottom. The first outlet 13 is connected with a differential pressure sensor 19 through a fifth pipeline 22-5, so as to realize real-time online continuous measurement of the liquid permeability value of the carbonate rock sample during the water-rock reaction process. The differential pressure sensor 19 has a measurement range of 0.1-10000×10 -3 μm 2 . The second outlet 14 is connected with a sampler 20 through a sixth pipeline 22-6, and the third outlet 14 is connected with the backflow port 1-9 through a seventh pipeline 22-7, a back pressure pump 21 and an eighth pipeline 22-8. The back pressure pump 21 is a high-precision high-pressure plunger pump, which is used to drive the solution in the L-shaped liquid-gas containing cavity 3 to flow, so as to realize the circulation flow of the fluid under high temperature and high pressure. Figure 2 The reaction kettle 1 is a partial sectional view, and the main feed port 1-4 is communicated with the L-shaped liquid-gas containing cavity 3.

[0027] In this embodiment, the ion concentration in the generated solution in the sampler 20 is measured, the connected pore volume, the gas porosity, the gas permeability and the mass of the carbonate rock sample after dissolution are measured, the changes of the gas porosity, the gas permeability and the mass before and after dissolution are calculated, and the dissolution amount and dissolution effect of the carbonate rock under different diagenetic environments are quantitatively evaluated.

[0028] The first core holder 7 and the second reaction chamber 6 each include a hydraulic rod and a piston connected with the hydraulic rod, and the cross-sectional size of the piston is the same as the cross-sectional size of the cavity of the reaction chamber. The differential pressure sensor 19 is electrically connected with the temperature controller 1-7, and the temperature controller 1-7 is also used to display the measurement value of the differential pressure sensor 19 in real time.

[0029] The carbonate rock water-rock dissolution simulation device further includes a water container 16, a double-plunger pump 17, a pressure container 18 and a gas cylinder 19. The water container 16 is connected with the double-plunger pump 17 through a first pipeline 22-1, the double-plunger pump 17 is connected with the pressure container 18 through a second pipeline 22-2, the gas cylinder 19 is connected with the pressure container 18 through a third pipeline 22-3, and the pressure container 18 is connected with the main feed port 1-4 through a fourth pipeline 22-4. The first pipeline 22-1 to the eighth pipeline 22-8 of this embodiment are each provided with a valve 23.

[0030] The water container 16 is added with a fluid, the medium of the fluid is organic acetic acid in oilfield water, and the concentration of the organic acetic acid is selected as one of 2 g / L, 4 g / L, 5 g / L, 6 g / L and 8 g / L; the fluid is also added with sodium sulfate, calcium chloride and magnesium chloride; the gas cylinder 19 is provided with carbon dioxide gas. The temperature in the first reaction chamber 4 and the second reaction chamber 6 ranges from normal temperature to 400 DEG C, the pressure ranges from normal pressure to 100 MPa, and the flow rate of the fluid ranges from 0.1 mL / S to 10 mL / S. The first carbonate rock sample 4-1 and the second carbonate rock sample 6-1 are selected from a large number of developed grain dolomite, the high-temperature and high-pressure dissolution simulation experiment of the carbonate rock sample is carried out, the formation and evolution process of the dolomite pore is discussed, and the dissolution amount and dissolution effect under different diagenetic environments are determined.

[0031] The embodiment of the present application also provides an intelligent simulation experiment method for monitoring carbonate rock water-rock dissolution by using a temperature controller, which is realized by using the above intelligent simulation device for monitoring carbonate rock water-rock dissolution by using a temperature controller, and comprises the following steps.

[0032] In step S1, the fluid is placed in the water container, the carbon dioxide gas is added to the gas cylinder, and the fluid is injected into the reaction kettle provided with the carbonate rock sample under the set temperature, pressure and flow rate, so as to perform water-rock reaction with the carbonate rock sample.

[0033] In step S2, the ion concentration in the generated solution in the sampler is measured, the connected pore volume, gas porosity, gas permeability and mass of the carbonate rock sample after dissolution are measured, the changes of the gas porosity, gas permeability and mass before and after dissolution are calculated, and the dissolution amount and dissolution effect of the carbonate rock under different diagenetic environments are quantitatively evaluated.

[0034] Preferably, in step S1, the medium of the fluid is organic acetic acid in oilfield water, and the concentration of the organic acetic acid is selected as one of 2 g / L, 4 g / L, 5 g / L, 6 g / L and 8 g / L; in step S1, the fluid is also added with sodium sulfate, calcium chloride and magnesium chloride; in step S1, the carbonate rock sample is the calcareous dolomite of the Lower Cambrian Longwangmiao Formation in the Sichuan Basin, the calcite content of the dolomite is 49.7%, and the dolomite content is 49.2%. In step S1, the temperature of the reaction kettle ranges from normal temperature to 400 DEG C, the pressure ranges from normal pressure to 100 MPa, and the flow rate of the fluid ranges from 0.1 mL / S to 10 mL / S.

[0035] In step S2, two portions of the generated solution are collected, each portion of the liquid is 6 mL, and the Ca 2+ and Mg 2+ ion concentration is measured, and the dissolution rate of the rock is analyzed. In step S2, the carbonate rock sample is subjected to pore permeability and CT scanning analysis, so as to detect the pore change characteristics.

[0036] To sum up, although the present application has been disclosed with preferred embodiments as above, the preferred embodiments are not used to limit the present application, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present application, and therefore the protection scope of the present application is defined by the scope of the claims.

Claims

1. An intelligent simulation device for monitoring carbonate rock water corrosion using a temperature controller, characterized in that: The invention comprises a reactor (1), wherein the reactor (1) is a box structure, the top surface (1-1) of the reactor (1) is provided with a main feed port (1-4), the left side surface (1-2) of the reactor (1) is provided with an auxiliary feed port (1-5), and the front side surface of the reactor (1) is provided with a window (1-6), a temperature controller (1-7) and a heating switch button (1-8); The reactor (1) is provided with a heat-insulating layer (2) and a working chamber, and the working chamber is provided with an L-shaped liquid-gas containing chamber (3), a first reaction chamber (4), a heating chamber (5) and a second reaction chamber (6); a temperature sensor (11) and a pressure sensor (12) are provided in the L-shaped liquid-gas containing chamber (3), and the temperature sensor (11) and the pressure sensor (12) are electrically connected to the temperature controller (1-7); the first reaction chamber (4) and the second reaction chamber (6) are provided on both sides of the heating chamber (5), and the A heating wire (5-1) is provided in the heating chamber (5), and the heating wire (5-1) is electrically connected to the heating switch button (1-8); a slidable first core clamp (7) is provided on both sides of the first reaction chamber (4) for clamping the first carbonate rock sample (4-1); a slidable second core clamp (8) is provided on both sides of the second reaction chamber (6) for clamping the second carbonate rock sample (6-1); and a reflux port (1-9) is provided on the right side of each of the first reaction chamber (4) and the second reaction chamber (6); The bottom of the L-shaped liquid-gas containing chamber (3) is provided with a first outlet (13), a second outlet (14) and a third outlet (15); the first outlet (13) is connected to a pressure differential sensor (19) via a fifth pipeline (22-5), for achieving real-time online continuous measurement of the liquid permeability value of the carbonate rock sample during the water-rock reaction process; the pressure differential sensor (19) has a measuring range of 0.1 to 10000×10 -3 μm 2 The second outlet (14) is connected to a sampler (20) via a sixth pipeline (22-6); the third outlet (15) is connected to the reflux port (1-9) via a seventh pipeline (22-7), a back pressure pump (21) and an eighth pipeline (22-8).

2. The intelligent simulation device for monitoring carbonate rock water-rock corrosion using a temperature controller according to claim 1, characterized in that: The first core holder (7) and the second reaction chamber (6) both comprise a hydraulic rod and a piston connected to the hydraulic rod, and the cross-sectional dimensions of the piston are the same as the cross-sectional dimensions of the cavity of the reaction chamber.

3. The intelligent simulation device for monitoring carbonate rock water-rock corrosion using a temperature controller according to claim 1, characterized in that: The differential pressure sensor (19) is electrically connected to the temperature controller (1-7), and the temperature controller (1-7) is also used to display the measurement value of the differential pressure sensor (19) in real time.

4. The intelligent simulation device for monitoring carbonate rock water-rock corrosion using a temperature controller according to claim 1, characterized in that: The back pressure pump (21) is a high-precision high-pressure plunger pump, which is used to drive the solution in the L-shaped liquid-gas containing chamber (3) to flow, thereby realizing the circulation of the fluid under high temperature and high pressure.

5. The intelligent simulation device for monitoring carbonate rock water-rock corrosion using a temperature controller according to claim 1, characterized in that: The invention also comprises a water container (16), a double-plunger pump (17), a pressure container (18) and a gas cylinder; the water container (16) is connected to the double-plunger pump (17) via a first pipeline (22-1), the double-plunger pump (17) is connected to the pressure container (18) via a second pipeline (22-2), the gas cylinder is connected to the pressure container (18) via a third pipeline (22-3), and the pressure container (18) is connected to the main feed port (1-4) via a fourth pipeline (22-4).

6. The intelligent simulation device for monitoring carbonate rock water-rock corrosion using a temperature controller according to claim 5, characterized in that: The first pipeline (22-1) to the eighth pipeline (22-8) are all provided with valves (23).

7. The intelligent simulation device for monitoring carbonate rock water-rock corrosion using a temperature controller according to claim 5, characterized in that: Fluid is added into the water container (16), wherein the medium of the fluid is organic acetic acid in oilfield water, and the concentration of the organic acetic acid is selected as one of 2g / L, 4g / L, 5g / L, 6g / L and 8g / L solutions; sodium sulfate, calcium chloride and magnesium chloride are also added into the fluid; and carbon dioxide gas is provided in the gas cylinder.

8. The intelligent simulation device for monitoring carbonate rock water-rock corrosion using a temperature controller according to claim 1, characterized in that: The temperature range in the first reaction chamber (4) and the second reaction chamber (6) is from room temperature to 400° C., the pressure range therein is from normal pressure to 100 MPa, and the fluid flow rate therein is 0.1 to 10 mL / S.

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