Intelligent simulation device for monitoring carbonate rock water rock corrosion by using temperature controller

Abstract

The invention provides an intelligent simulation device for monitoring carbonate rock water rock corrosion by using a temperature controller, the intelligent simulation device comprises a reaction kettle, a thermal insulation layer and a working chamber are arranged in the reaction kettle, and an L-shaped liquid-gas accommodating 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 electrically connected with the temperature controller. A heating wire is arranged in the heating chamber and is electrically connected with the heating switch button; slidable core holders are arranged on the two sides of the first reaction chamber and the second reaction chamber and are used for clamping carbonate rock samples; according to the invention, detection technologies of a high-precision temperature controller, a temperature sensor, a pressure sensor and a differential pressure sensor are combined, so that the test quality of the reaction kettle is improved, a carbonate rock water rock corrosion simulation test can provide more accurate and reliable results in various environments, and time is saved.

Description

Technical Field

[0001] The invention belongs to the technical field of dissolution experiments, and in particular relates to an intelligent simulation device for monitoring carbonate rock water dissolution by using a temperature controller. Background Art

[0002] Dolomite is a key area for deep oil and gas exploration. Most of my country's ancient dolomite strata have experienced deep burial, high temperature and high pressure, and long-term diagenetic superposition and transformation. They have undergone various dissolution processes to form secondary pores and caves, becoming important oil and gas storage spaces. Oil and gas production also reveals that the development of dissolution pores is one of the important factors controlling oil and gas production. Therefore, revealing the formation mechanism and evolution process of dissolution pores is crucial for predicting the distribution of high-quality dolomite reservoirs.

[0003] There are two mechanisms for the formation of dissolution pores: one is atmospheric water dissolution in the early diagenetic or epigenetic period; the other is burial dissolution. Burial dissolution is special. Dissolution pores or holes are the end products, and there are no corresponding diagenetic products that can be used to directly analyze the conditions of their occurrence. Therefore, the understanding of their formation mechanism has long been controversial. Dissolution simulation experiments provide an effective means to study the conditions and processes of dissolution.

[0004] Since the 1960s, domestic and foreign scholars have used experimental methods to conduct research on the mechanism of carbonate dissolution. With the discovery of a large number of deeply buried carbonate oil and gas reservoirs, the study of carbonate dissolution mechanisms under high temperature and high pressure has become the focus of simulation experiments. The simulated experimental conditions have naturally evolved from low temperature and low pressure to high temperature and high pressure environments, and the experimental samples have gradually replaced single mineral samples such as calcite and dolomite with carbonate rock samples. These studies have promoted the deepening of geological understanding of dolomite dissolution response under deep burial conditions, but the control of dolomite crystal characteristics on dissolution and the formation process of dissolution pores are still unclear and need further study. Summary of the invention

[0005] The present invention provides an intelligent simulation device for monitoring carbonate rock water-rock dissolution using a temperature controller. Through an intelligent reactor, a large amount of deep-layer crystalline dolomite is selected to carry out a high-temperature and high-pressure dissolution simulation experiment on carbonate rock samples, so as to explore the formation and evolution process of dolomite pores and clarify the dissolution amount and dissolution effect under different diagenetic environments.

[0006] To solve the above problems, the technical solution provided by the present invention is as follows:

[0007] The embodiment of the present invention provides an intelligent simulation device for monitoring carbonate rock water-rock dissolution using a temperature controller, comprising a reactor, the reactor being a box structure, the top surface of the reactor being provided with a main feed inlet, the left side surface of the reactor being provided with an auxiliary feed inlet, and the front side surface of the reactor being provided with a window, a temperature controller and a heating switch button;

[0008] The reactor is provided with a heat-insulating layer and a working room, and the working room is provided with an L-shaped liquid-gas containing chamber, a first reaction chamber, a heating chamber and a second reaction chamber; the L-shaped liquid-gas containing chamber is provided with a temperature sensor and a pressure sensor, and the temperature sensor and the pressure sensor are electrically connected to the temperature controller; the first reaction chamber and the second reaction chamber are provided on both sides of the heating chamber, and a heating wire is provided in the heating chamber, and the heating wire is electrically connected to the heating switch button; a slidable first core clamp is provided on both sides of the first reaction chamber for clamping a first carbonate rock sample; a slidable second core clamp is provided on both sides of the second reaction chamber for clamping a second carbonate rock sample; and a reflux port is provided on the right side of the first reaction chamber and the second reaction chamber;

[0009] The bottom of the L-shaped liquid-gas containing chamber is provided with a first outlet, a second outlet and a third outlet. The first outlet is connected to a differential pressure sensor through a fifth pipeline, which is used to realize the 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 has a measuring range of 0.1 to 10000×10 -3 μm 2 The second outlet is connected to a sampler through a sixth pipeline, and the third outlet is connected to the reflux port through a seventh pipeline, a back pressure pump and the eighth pipeline.

[0010] In an optional embodiment of the present invention, the first core holder and the second reaction chamber both include a hydraulic rod and a piston connected to 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 invention, the differential pressure sensor is electrically connected to the temperature controller, and the temperature controller is also used to display the measurement value of the differential pressure sensor in real time.

[0012] In an optional embodiment of the present invention, the back-pressure pump adopts a high-precision and high-pressure plunger pump to drive the solution in the L-shaped liquid-gas containing chamber to flow, thereby realizing the circulation of the fluid under high temperature and high pressure.

[0013] An optional embodiment of the present invention further includes a water container, a double-plunger pump, a pressure vessel and a gas cylinder; the water container is connected to the double-plunger pump through a first pipe, the double-plunger pump is connected to the pressure vessel through a second pipe, the gas cylinder is connected to the pressure vessel through a third pipe, and the pressure vessel is connected to the main feed port through a fourth pipe.

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

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

[0016] In an optional embodiment of the present invention, the temperature range in the first reaction chamber and the second reaction chamber 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.

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

[0018] In order to more clearly illustrate the technical solutions in the embodiments or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1A schematic diagram of the appearance of a reactor of an intelligent simulation device for monitoring carbonate rock water-rock dissolution using a temperature controller provided in an embodiment of the present application.

[0020] Figure 2 A schematic diagram of the interior of a reactor of an intelligent simulation device for monitoring carbonate rock water-rock dissolution using a temperature controller provided in an embodiment of the present application.

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

[0022] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with 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 of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0023] like Figure 1 , Figure 2 and Figure 3 As shown, an embodiment of the present invention provides an intelligent simulation device for monitoring carbonate water-rock dissolution using a temperature controller, including a reactor 1, 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.

[0024] The reactor 1 is provided with a heat insulating layer 2 and a working room, and the working room 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; the L-shaped liquid-gas containing chamber 3 is provided with a temperature sensor 11 and a pressure sensor 12, 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 arranged on both sides of the heating chamber 5, and a heating wire 5-1 is arranged in the heating chamber 5, and the heating wire 5-1 is electrically connected to the heating switch button 1-8. The temperature controller 1-7 is a preset upper limit threshold for setting the current test temperature. When the preset temperature is reached, the heating switch button 1-8 is controlled to stop heating, and the temperature controller 1-7 will also display the current temperature and the set temperature upper limit in real time.

[0025] A slidable first core clamp 7 is arranged 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 arranged on both sides of the second reaction chamber 6 for clamping the second carbonate rock sample 6-1; a reflux port 1-9 is arranged on the right side of the first reaction chamber 4 and the second reaction chamber 6.

[0026] The L-shaped liquid-gas containing chamber 3 is surrounded by a high-temperature and high-pressure resistant rubber layer 9. 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 differential pressure sensor 19 through a fifth pipeline 22-5, which is used to realize the 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 measuring range of 0.1 to 10000×10 -3 μm 2 The second outlet 14 is connected to the sampler 20 through the sixth pipeline 22-6, and the third outlet 14 is connected to the reflux port 1-9 through the seventh pipeline 22-7, the back pressure pump 21 and the eighth pipeline 22-8. The back pressure pump 21 adopts a high-precision high-pressure plunger pump to drive the solution in the L-shaped liquid-gas containing chamber 3 to flow, so as to realize the circulation of the fluid under high temperature and high pressure. Note: Figure 2 It is a partial cross-sectional schematic diagram of the reaction kettle 1, in which the main feed inlet 1-4 is connected to the L-shaped liquid-gas containing chamber 3.

[0027] This embodiment measures the ion concentration in the generated solution in the sampler 20, measures the connected pore volume, gas porosity, gas permeability and mass of the carbonate rock sample after dissolution, and calculates the changes in gas porosity, gas permeability and mass before and after dissolution, so as to achieve quantitative evaluation of the dissolution amount and dissolution effect of carbonate rock under different diagenetic environments.

[0028] The first core holder 7 and the second reaction chamber 6 both include 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. 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.

[0029] The carbonate rock water-rock erosion simulation device also 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 to the double plunger pump 17 through a first pipeline 22-1, the double plunger pump 17 is connected to the pressure container 18 through a second pipeline 22-2, the gas cylinder 19 is connected to the pressure container 18 through a third pipeline 22-3, and the pressure container 18 is connected to 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 all provided with a valve 23.

[0030] Fluid is added into the water container 16, and the medium of the fluid is organic acetic acid in oilfield water, and the concentration of organic acetic acid is selected as one of 2g / L, 4g / L, 5g / L, 6g / L and 8g / L; sodium sulfate, calcium chloride and magnesium chloride are also added to the fluid; carbon dioxide gas is arranged in the gas cylinder 19. 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 100MPa, and the fluid flow rate therein is 0.1-10mL / S. The first carbonate rock sample 4-1 and the second carbonate rock sample 6-1 are selected from a large number of developed crystalline dolomites, and a high temperature and high pressure dissolution simulation experiment of carbonate rock samples is carried out to explore the formation and evolution process of dolomite pores and clarify the dissolution amount and dissolution effect under different diagenetic environments.

[0031] The embodiment of the present invention further provides an intelligent simulation experimental method for monitoring carbonate rock water-rock corrosion using a temperature controller, which is implemented by using the above-mentioned intelligent simulation device for monitoring carbonate rock water-rock corrosion using a temperature controller, and includes the following steps:

[0032] Step S1, placing the fluid in a water container, adding carbon dioxide gas into a gas cylinder; injecting the fluid into a reactor containing a carbonate rock sample at a set temperature, pressure and flow rate to perform a water-rock reaction with the carbonate rock sample;

[0033] Step S2, determining the ion concentration in the generated solution in the sampler, determining the connected pore volume, gas porosity, gas permeability and mass of the carbonate rock sample after dissolution, and calculating the changes in gas porosity, gas permeability and mass before and after dissolution, so as to quantitatively evaluate the dissolution amount and dissolution effect of carbonate rock in different diagenetic environments.

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

[0035] In step S2, two portions of the generated solution are collected, each portion of which is 6 mL, and used for Ca 2+ Mg 2+ Ion concentration measurement, analysis of rock dissolution rate. Perform porosity and permeability and CT scanning analysis on the carbonate rock sample in step S2 to detect pore change characteristics.

[0036] In summary, although the present invention has been disclosed as above in terms of preferred embodiments, the above preferred embodiments are not intended to limit the present invention. A person skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope defined in the claims.

Claims

1. An intelligent simulation device for monitoring carbonate rock water-rock erosion using a temperature controller, characterized in that: The invention comprises a reaction kettle (1), wherein the reaction kettle (1) is a box structure, the top surface (1-1) of the reaction kettle (1) is provided with a main feed inlet (1-4), the left side surface (1-2) of the reaction kettle (1) is provided with an auxiliary feed inlet (1-5), and the front side surface of the reaction kettle (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); the L-shaped liquid-gas containing chamber (3) is provided with a temperature sensor (11) and a pressure sensor (12), 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 arranged in the heating chamber (5), and the heating wire (5-1) is electrically connected to the heating switch button (1-8); slidable first core holders (7) are arranged on both sides of the first reaction chamber (4) for clamping the first carbonate rock sample (4-1); slidable second core holders (8) are arranged on both sides of the second reaction chamber (6) for clamping the second carbonate rock sample (6-1); and the right sides of the first reaction chamber (4) and the second reaction chamber (6) are both provided with a reflux port (1-9); 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 differential pressure sensor (19) via a fifth pipeline (22-5), and is used to achieve 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 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 (14) is connected to the reflux port (1-9) via a seventh pipeline (22-7), a back pressure pump (21) and the eighth pipeline (22-8).

2. The intelligent simulation device for monitoring carbonate rock water-rock erosion 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 erosion 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 erosion 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 erosion 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 (19); 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 (19) 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 erosion 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 erosion using a temperature controller according to claim 5, characterized in that: Fluid is added into the water container (16), the medium of the fluid is organic acetic acid in oilfield water, and the concentration of organic acetic acid is selected as a solution of 2g / L, 4g / L, 5g / L, 6g / L and 8g / L; sodium sulfate, calcium chloride and magnesium chloride are also added into the fluid; carbon dioxide gas is arranged in the gas cylinder (19).

8. The intelligent simulation device for monitoring carbonate rock water-rock erosion 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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