Oil reservoir top stable gravity gas drive simulation experiment device with dip angle

Abstract

The utility model relates to an oil reservoir top stable gravity gas drive simulation experiment device with an inclination angle. The simulation experiment device comprises an injection module, a reservoir well pattern simulation module and an output module which are connected in sequence. The reservoir well pattern simulation module comprises a sand filling box, the sand filling box is filled with a cemented quartz sand layer from top to bottom, and an injection well and a production well are embedded in the cemented quartz sand layer; a logging electrode is further buried in the cemented quartz sand layer; one end of the fixed base is fixedly connected with one side of the bottom of the sand filling box, and the other end of the fixed base is connected with the other side of the bottom of the sand filling box through a lifting device. The inclination angle of the sand filling box is freely adjusted through the lifting device, the authenticity of simulating the actual oilfield development environment is improved, and the problem that only a single oil reservoir type is conventionally simulated is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of top gas injection simulation experiment evaluation, in particular to a stable gravity gas drive simulation experiment device at the top of an oil reservoir with an inclination angle. Background Art

[0002] In recent years, with the increasing demand for conventional oil and gas in China and the increasing global demand for oil and gas, the difficulty of oil and gas resource exploitation has also increased. It is difficult to fully utilize reservoir oil and gas by relying solely on primary and secondary oil recovery. Therefore, tertiary oil recovery by gas drive development has become an effective means to improve oil recovery. my country's gas injection oil recovery technology has developed relatively late, and its research mainly targets low-permeability reservoirs, with poor miscibility, early breakthrough time, and poor results. Gas-stabilized gravity flooding is one of the gas injection methods that can be successfully applied and improve oil recovery abroad. It is a gas drive that relies on the gravity difference between gas cap and crude oil. It is mainly used for high-inclination reservoirs or high-permeability and thick reservoirs. The gravity drive sweep efficiency can be as high as above. However, this technology has not been well applied in China.

[0003] The geological conditions of domestic oil fields vary, and water injection is still the main development method at this stage. Top stable gravity gas drive is still immature, the optimization of injection and production parameters is not perfect, there are relatively few well sites for on-site implementation and no significant benefits, the investment in gas production equipment and injection equipment is large, and some gas injections such as air have great safety risks. Due to the above factors, top stable gravity gas drive is generally not implemented directly on site, but mostly studied indoors. The utility model simulates the sand filling box of oil reservoirs with different inclinations, and simulates the top gas injection to form a gas cap through different perforation locations of the injection and production wells. It overcomes the problem of conventional simulation of only a single reservoir type, and can also perform good simulation and parameter optimization research, with good versatility and applicability. Summary of the invention

[0004] The utility model aims to solve the above problems and proposes a method of simulating a sand filling box of oil reservoirs with different inclination angles and simulating a flooding method of forming a gas cap by top gas injection through different perforation positions of injection and production wells, thereby providing a way to evaluate the effect of stable gravity gas flooding at the top of oil reservoirs with different inclination angles.

[0005] The technical solution of the utility model is:

[0006] A stable gravity gas drive simulation experimental device with an inclined oil reservoir top, comprising an injection module, a reservoir well pattern simulation module and an output module connected in sequence; the reservoir well pattern simulation module comprises a sand filling box, the sand filling box is filled with a cemented quartz sand layer from top to bottom, the cemented quartz sand layer is embedded with an injection well and a production well; a logging electrode is also buried in the cemented quartz sand layer; and a fixed base is also included, one end of the fixed base is fixedly connected to one side of the bottom of the sand filling box, and the other end is connected to the other side of the bottom of the sand filling box through a lifting device.

[0007] The lifting device comprises a lifting column, one end of which is connected to the bottom of the sand filling box, and the other end is inserted into the fixed base. A lifting column regulating valve is also arranged on the lifting column.

[0008] The fixed base is fixedly connected to the bottom of the sand filling box through a hinge.

[0009] The bottom end of the injection well is located at the top of the reservoir, and the bottom end of the production well is located at the middle of the reservoir and below the middle.

[0010] The injection module includes a piston container group, which includes a crude oil piston container, a formation water piston container and a gas injection piston container; the crude oil piston container, the formation water piston container and the gas injection piston container are all connected to a constant speed and constant pressure displacement pump at one end, and connected to the reservoir well network simulation module through an input pipeline at the other end.

[0011] The output module comprises a gas-liquid separator; the input end of the gas-liquid separator is connected to the reservoir well pattern simulation module, and the output end of the gas-liquid separator is respectively connected to a liquid metering container and a gas metering container.

[0012] It also includes a recording and analysis module, which includes a computer and a data acquisition device connected to the computer; the data acquisition device includes an injection temperature meter, an injection flow meter and an injection pressure meter arranged on the input pipeline, and an output temperature meter and an output pressure meter arranged on the output pipeline.

[0013] A crude oil displacement control valve is provided on the connecting pipeline between the crude oil piston container and the constant speed and constant pressure displacement pump, a formation water displacement control valve is provided on the connecting pipeline between the formation water piston container and the constant speed and constant pressure displacement pump, and a gas input control valve is provided on the connecting pipeline between the gas injection piston container and the constant speed and constant pressure displacement pump; a fluid input control valve is provided on the input pipeline, and a fluid output control valve is provided on the output pipeline.

[0014] The sand filling box is provided with a sand filling opening, and the sand filling opening is provided with a sand filling cover.

[0015] The technical effects of the utility model are:

[0016] (1) The utility model can freely adjust the inclination angle of the sand filling box through the lifting device, thereby improving the authenticity of the simulation of the actual oil field development environment and overcoming the difficulty of conventional simulation of only a single reservoir type. By simulating the depth of the injection well and the production well embedded in the cemented quartz sand layer at different perforation positions in the reservoir, the applicability of the experimental simulation device is improved. The utility model has the advantages of strong systematization, simple operation and strong maintainability;

[0017] (2) More preferably, when the bottom end of the injection well is located at the top of the reservoir and the bottom end of the production well is located at the middle of the reservoir or below the middle, it is used to simulate the oil displacement method of top gas injection to form a gas cap. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a stable gravity gas drive simulation experimental device at the top of an inclined reservoir.

[0019] Figure 2 This is the left view of the sand filling box.

[0020] Figure 3 This is a top view of the sand filling box.

[0021] Figure numerals: 1-1, crude oil piston container; 1-2, formation water piston container; 1-3, gas injection piston container; 2-1, crude oil displacement control valve; 2-2, formation water displacement control valve; 2-3, gas input control valve; 3, constant speed and constant pressure displacement pump; 4, fluid input control valve; 5, injection temperature gauge; 6, injection flow meter; 7, production well; 8, injection well; 9, sand filling box; 10, injection pressure gauge; 12, production pressure gauge; 13, fluid output control valve; 14, production temperature gauge; 15, gas-liquid separator; 17, fixed base; 18, lifting column regulating valve; 19, lifting column; 20, hinge; 21, logging electrode; 22, liquid measuring container; 23, gas measuring container. DETAILED DESCRIPTION

[0022] Example 1

[0023] A stable gravity gas drive simulation experimental device with an inclined reservoir top, comprising an injection module, a reservoir well pattern simulation module and an output module connected in sequence; the reservoir well pattern simulation module comprises a sand filling box 9, the sand filling box 9 is filled with a cemented quartz sand layer from top to bottom, the cemented quartz sand layer is embedded with an injection well 8 and a production well 7; a logging electrode 21 is also buried in the cemented quartz sand layer; and a fixed base 17 is also included, one end of the fixed base 17 is fixedly connected to one side of the bottom of the sand filling box 9, and the other end is connected to the other side of the bottom of the sand filling box 9 through a lifting device.

[0024] Example 2

[0025] On the basis of Example 1, it also includes:

[0026] The lifting device includes a lifting column 19, one end of which is connected to the bottom of the sand filling box 9, and the other end is inserted into the fixed base 17. The lifting column 19 is also provided with a lifting column regulating valve 18; the fixed base 17 is fixedly connected to the bottom of the sand filling box 9 through a hinge 20.

[0027] Example 3

[0028] On the basis of Example 2, it also includes: the bottom end of the injection well 8 is located at the top of the reservoir, and the bottom end of the production well 7 is located in the middle of the reservoir and below the middle, so as to simulate the oil displacement method of top gas injection to form a gas cap.

[0029] Example 4

[0030] On the basis of Example 3, the invention further includes:

[0031] The injection module includes a piston container group, which includes a crude oil piston container 1-1, a formation water piston container 1-2 and a gas injection piston container 1-3; the crude oil piston container 1-1, the formation water piston container 1-2 and the gas injection piston container 1-3 are all connected to a constant speed constant pressure displacement pump 3 at one end, and connected to the reservoir well network simulation module through an input pipeline at the other end;

[0032] The output module includes a gas-liquid separator 15; the input end of the gas-liquid separator 15 is connected to the reservoir well pattern simulation module, and the output end of the gas-liquid separator 15 is respectively connected to a liquid metering container 22 and a gas metering container 23;

[0033] It also includes a recording and analysis module, which includes a computer and a data acquisition device connected to the computer; the data acquisition device includes an injection temperature meter 5, an injection flow meter 6 and an injection pressure meter 10 arranged on the input pipeline, and an output temperature meter 14 and an output pressure meter 12 arranged on the output pipeline.

[0034] Example 5

[0035] On the basis of Example 4, it also includes:

[0036] The connecting pipeline between the crude oil piston container 1-1 and the constant speed and constant pressure displacement pump 3 is provided with a crude oil displacement control valve 2-1, the connecting pipeline between the formation water piston container 1-2 and the constant speed and constant pressure displacement pump 3 is provided with a formation water displacement control valve 2-2, and the connecting pipeline between the gas injection piston container 1-3 and the constant speed and constant pressure displacement pump 3 is provided with a gas input control valve 2-3; the input pipeline is provided with a fluid input control valve 4, and the output pipeline is provided with a fluid output control valve 13;

[0037] The sand filling box 9 is provided with a sand filling opening, and the sand filling opening is provided with a sand filling cover.

[0038] The specific implementation process of the utility model is:

[0039] 1) Set the experimental parameters;

[0040] 2) According to the experimental settings, a quartz sand mixture and a binder in an appropriate proportion are used, and they are fully mixed to form a cemented quartz sand layer for sand filling operation. Each injection well 8 and production well 7 is embedded in the sand filling box 9 according to the preset well network injection and production position; the depth of the injection well 8 and production well 7 embedded in the cemented quartz sand layer is used to simulate different perforation positions in the reservoir; in this embodiment, the bottom end of the injection well 8 is located at the top of the reservoir, and the bottom end of the production well 7 is located in the middle of the reservoir and below the middle; this is to simulate the oil displacement method of top gas injection to form a gas cap;

[0041] 3) Before the experiment, check the sealing of the stable gravity gas drive simulation experimental device with an inclination reservoir top, and evacuate the vacuum after ensuring the sealing is intact. By rotating the lifting column regulating valve 18, adjust the sand filling box 9 to a certain inclination to simulate the reservoir development inclination, and store different displacement fluids in the crude oil piston container 1-1, the formation water piston container 1-2 and the gas injection piston container 1-3; open the formation water displacement control valve 2-2, and use the constant speed and constant pressure displacement pump 3 to inject formation water into the reservoir until it is saturated, and record the amount of injected water;

[0042] 4) Close the formation water displacement control valve 2-2, open the crude oil displacement control valve 2-1, displace the formation water in the reservoir, until the output end of the reservoir well pattern simulation module stops discharging water, and record the displacement water volume;

[0043] 5) Start the top gas injection simulation experiment, close the crude oil displacement control valve 2-1 and the formation water displacement control valve 2-2, open the gas input control valve 2-3, and conduct the top gas injection simulation experiment; control the displacement pressure difference between the input end and the output end of the reservoir well network simulation module to be constant; stop the top gas injection experiment until the gas production at the output end of the reservoir well network simulation module no longer changes; then separate the gas and liquid by the gas-liquid separator 15 and output them to the liquid metering container 22 and the gas metering container 23 to measure the liquid production and gas production;

[0044] 6) Rotate the lifting column regulating valve 18 again to adjust the angle of the sand filling box 9, and repeat 3), 4) and 5);

[0045] 7) Record the injection pressure, production pressure, injection temperature, production temperature, injection water volume, displacement water volume, gas production and liquid production during the experiment, and transmit the data to the computer; the computer calculates the data and draws the change curves of parameters such as the degree of production, gas-oil ratio, oil change rate and injection pressure of each group of experiments, comprehensively analyzes and evaluates the top gas injection effect, and optimizes the injection and production parameters.

Claims

1. A stable gravity gas drive simulation experimental device for the top of an oil reservoir with an inclination angle, comprising an injection module, a reservoir well pattern simulation module and an output module connected in sequence; characterized in that: The reservoir well pattern simulation module comprises a sand filling box (9), the sand filling box (9) is filled with a cemented quartz sand layer from top to bottom, and an injection well (8) and a production well (7) are embedded in the cemented quartz sand layer; a logging electrode (21) is also buried in the cemented quartz sand layer; and the module also comprises a fixed base (17), one end of which is fixedly connected to one side of the bottom of the sand filling box (9), and the other end is connected to the other side of the bottom of the sand filling box (9) through a lifting device.

2. The stable gravity gas drive simulation experimental device for the top of an oil reservoir with an inclination angle according to claim 1 is characterized in that: The lifting device comprises a lifting column (19), one end of which is connected to the bottom of the sand filling box (9), and the other end is inserted into the fixed base (17). A lifting column regulating valve (18) is also provided on the lifting column (19).

3. The stable gravity gas drive simulation experimental device for the top of an oil reservoir with an inclination angle according to claim 2 is characterized in that: The fixed base (17) is fixedly connected to the bottom of the sand filling box (9) via a hinge (20).

4. The stable gravity gas drive simulation experimental device for the top of an oil reservoir with an inclination angle according to claim 2 is characterized in that: The bottom end of the injection well (8) is located at the top of the reservoir, and the bottom end of the production well (7) is located at the middle of the reservoir or below the middle.

5. The stable gravity gas drive simulation experimental device for the top of an oil reservoir with an inclination angle according to claim 4 is characterized in that: The injection module comprises a piston container group, which comprises a crude oil piston container (1-1), a formation water piston container (1-2) and a gas injection piston container (1-3); the crude oil piston container (1-1), the formation water piston container (1-2) and the gas injection piston container (1-3) are all connected to a constant speed constant pressure displacement pump (3) at one end, and connected to a reservoir well network simulation module through an input pipeline at the other end.

6. The stable gravity gas drive simulation experimental device for the top of an oil reservoir with an inclination angle according to claim 5 is characterized in that: The output module comprises a gas-liquid separator (15); the input end of the gas-liquid separator (15) is connected to the reservoir well pattern simulation module, and the output end of the gas-liquid separator (15) is respectively connected to a liquid metering container (22) and a gas metering container (23).

7. The stable gravity gas drive simulation experimental device for the top of an oil reservoir with an inclination angle according to claim 6 is characterized by: It also includes a recording and analysis module, which includes a computer and a data acquisition device connected to the computer; the data acquisition device includes an injection temperature meter (5), an injection flow meter (6) and an injection pressure meter (10) arranged on the input pipeline, and an output temperature meter (14) and an output pressure meter (12) arranged on the output pipeline.

8. The stable gravity gas drive simulation experimental device for the top of an oil reservoir with an inclination angle according to claim 7 is characterized in that: A crude oil displacement control valve (2-1) is provided on the connecting pipeline between the crude oil piston container (1-1) and the constant speed constant pressure displacement pump (3); a formation water displacement control valve (2-2) is provided on the connecting pipeline between the formation water piston container (1-2) and the constant speed constant pressure displacement pump (3); a gas input control valve (2-3) is provided on the connecting pipeline between the gas injection piston container (1-3) and the constant speed constant pressure displacement pump (3); a fluid input control valve (4) is provided on the input pipeline, and a fluid output control valve (13) is provided on the output pipeline.

9. The stable gravity gas drive simulation experimental device for the top of an oil reservoir with an inclination angle according to claim 8, characterized in that: The sand filling box (9) is provided with a sand filling opening, and the sand filling opening is provided with a sand filling cover.

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