Device for simulating air injection oxidation effect of water-containing oil reservoir

Abstract

The utility model relates to the field of oil field production, in particular to a device for simulating the air injection oxidation effect of a water-containing oil reservoir, which comprises a containing bin, a first bottle body, a second bottle body and a third bottle body. The first end of the containing bin communicates with the first outlet valve and the second outlet valve. The first bottle body is communicated with the containing bin through a first pipeline and a first valve. The second bottle body is communicated with the containing bin through a second pipeline and a second valve. The third bottle body is communicated with the containing bin through a third pipeline and a third valve. And the first bottle body, the second bottle body and the third bottle body are respectively used for filling formation water, crude oil and air. The formation water, the crude oil and the air filled in the corresponding bottle bodies are fed into the accommodating bins through the corresponding pipelines, so that the air injection oxidation process of the water-containing oil reservoir can be simulated, and the problem that the oxidation effect of the formation water-containing oil reservoir is difficult to simulate due to the fact that injection of the formation water into the oil reservoir oxidation simulation system is not considered in the prior art is solved.

Description

Technical Field

[0001] This utility model relates to the field of oilfield production, and in particular to a device for simulating the effect of air injection oxidation in water-bearing oil reservoirs. Background Technology

[0002] Currently, most domestic oilfields are in the mid-to-late stages of development. Water-drive development methods result in high water saturation in reservoirs (oil reservoirs refer to crude oil accumulations with exploitable value within underground rock pores or fractures), and water saturation is a crucial factor affecting the oxidation effect of crude oil in reservoirs. Existing air-injection reservoir oxidation experimental devices are used to simulate the oxidation effect after injecting air into an oil reservoir oxidation simulation system, but they do not consider the injection of formation water into the system, making it difficult to simulate the oxidation effect in reservoirs containing formation water. Furthermore, for fractured reservoirs or tight reservoirs with well-developed formation fractures, factors such as the width, length, direction, and connectivity of fractures all affect the flow and consumption of oxygen in the reservoir. Because there is a possibility that injected oxygen may not be consumed by reservoir oxidation, when using fire-firing to develop the reservoir, the unconsumed oxygen may break through the combustion front along the fractures and directly enter the production well. When the oxygen content exceeds 8%, there is a significant fire and explosion safety risk. To ensure safe production, the extraction method of injecting deoxygenated air into the reservoir, namely deoxygenated air drive, has received increasing attention. However, existing air-injected reservoir oxidation experimental devices still focus on analyzing the reservoir oxidation effect of injected air, and it is difficult to simulate reservoir oxidation experiments with different oxygen concentrations of injected deoxygenated air.

[0003] Overall, current air-injection reservoir oxidation experimental devices are unable to realistically simulate the oxidation environment of reservoirs containing formation water, and the experimental results obtained are insufficient to determine the feasibility of implementing air injection oxidation in reservoirs containing formation water. Furthermore, current air-injection reservoir oxidation experimental devices lack a deoxygenated air simulation system, making it difficult to simulate reservoir oxidation experiments involving the injection of deoxygenated air with different oxygen concentrations. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of existing air-injection reservoir oxidation experimental devices, which do not consider the injection of formation water into the reservoir oxidation simulation system and are therefore unable to simulate the oxidation effect of water-bearing reservoirs. This invention provides a device for simulating the air-injection oxidation effect of water-bearing reservoirs.

[0005] This utility model provides a device for simulating the oxidation effect of air injection in water-bearing oil reservoirs, comprising:

[0006] A receiving chamber, the first end of which is connected to a first outlet valve and a second outlet valve respectively;

[0007] The first bottle body is connected to the inlet of the first pipe, and the outlet of the first pipe is connected to the second end of the receiving chamber. The first pipe is equipped with a first valve.

[0008] The second bottle body is connected to the inlet of the second pipe, and the outlet of the second pipe is connected to the second end of the receiving chamber. The second pipe is equipped with a second valve.

[0009] The third bottle body is connected to the inlet of the third pipe, the outlet of the third pipe is connected to the second end of the receiving chamber, and the third pipe is equipped with a third valve;

[0010] The first bottle, the second bottle, and the third bottle are respectively used to fill formation water, crude oil, and air.

[0011] This invention provides a device for simulating the oxidation effect of air injection in water-bearing oil reservoirs. The containment chamber is used to hold an artificial core of a matching size, serving as a sealed container to simulate the air injection oxidation process in water-bearing oil reservoirs. A first outlet valve is used to drain excess formation water during the experiment, and a second outlet valve is used to drain substances resulting from the oil reservoir oxidation reaction. By sending formation water, crude oil, and air, filled in corresponding containers, into the containment chamber through corresponding pipes, and placing the artificial core in the containment chamber, the oxidation process of air injection in water-bearing oil reservoirs can be simulated. This solves the problem in existing air injection oil reservoir oxidation experimental devices that do not consider injecting formation water into the oil reservoir oxidation simulation system, making it difficult to simulate the oxidation effect of water-bearing oil reservoirs.

[0012] Preferably, the system further includes a constant flow pump. The first, second, and third bottles are each connected to the constant flow pump via pipes. A first push valve is provided on the pipe connecting the constant flow pump to the first bottle, a second push valve is provided on the pipe connecting the constant flow pump to the second bottle, and a third push valve is provided on the pipe connecting the constant flow pump to the third bottle. Each of the first, second, and third bottles is equipped with a piston, and the constant flow pump is used to push the medium to squeeze the piston. When the first push valve is opened and the second and third push valves are closed, the constant flow pump pushes the medium to squeeze the piston in the first bottle, which can deliver the formation water in the first bottle into the containment chamber. When the second push valve is opened and the first and third push valves are closed, the constant flow pump pushes the medium to squeeze the piston in the second bottle, which can deliver the crude oil in the second bottle into the containment chamber. When the third push valve is opened and the first and second push valves are closed, the constant flow pump pushes the medium to squeeze the piston in the third bottle, which can deliver the air in the third bottle into the containment chamber. The constant flow pump can continuously deliver the medium at a constant flow rate. The constant flow pump can be set with flow rate and working pressure. The injection volume of the medium can be obtained by the data difference between start and stop operations, and thus the amount of material injected into the corresponding container can be obtained.

[0013] Preferably, the outlets of the first pipe, the second pipe, and the third pipe are all connected to the second end of the container via a main pipe.

[0014] The main pipeline is also connected to a fourth bottle and a fifth bottle.

[0015] The fourth cylinder is used to fill the mixed gas. The fourth cylinder is connected to the inlet of the fourth pipe, the outlet of the fourth pipe is connected to the main pipe, and the fourth cylinder is connected to the constant flow pump through a pipe. A fourth push valve is provided on the pipe connecting the constant flow pump and the fourth cylinder.

[0016] The fifth cylinder is used to fill nitrogen gas. The fifth cylinder is connected to the inlet of the fifth pipe, and the outlet of the fifth pipe is connected to the main pipe. The fifth pipe is equipped with a fifth valve. The fifth cylinder is connected to the constant flow pump through a pipe. The constant flow pump is connected to the fifth cylinder through a fifth push valve.

[0017] Both the fourth and fifth bottles are equipped with pistons, and the constant flow pump is used to push the medium to squeeze the pistons.

[0018] The main pipeline is equipped with a check valve and a fourth valve.

[0019] The outlets of the third and fifth pipes are both connected to the inlet of the one-way valve, and the outlet of the one-way valve is connected to the fourth pipe.

[0020] In this scheme, the one-way valve is a valve that only allows fluid to flow in one direction, preventing backflow and ensuring the directionality of fluid flow.

[0021] When the third propulsion valve and the third valve are opened, and the other valves are closed, the constant flow pump starts and pushes the medium to squeeze the piston inside the third bottle, thus sending the air inside the third bottle into the fourth bottle. When the fifth propulsion valve and the fifth valve are opened, and the other valves are closed, the constant flow pump starts and pushes the medium to squeeze the piston inside the fifth bottle, thus sending the nitrogen gas inside the fifth bottle into the fourth bottle.

[0022] After nitrogen and air are injected into the fourth cylinder, the mixed gas in the fourth cylinder is the deoxygenated air. Specifically, the deoxygenated air refers to air with an oxygen content lower than that of normal atmosphere. The deoxygenated air can be injected into the containment chamber and mixed with formation water and crude oil, thereby simulating the oxidation process of injecting deoxygenated air into formation water-bearing oil reservoirs.

[0023] Preferably, the system further includes a first pressure gauge for measuring the pressure in the fourth cylinder. The first pressure gauge records the pressure in the fourth cylinder before and after nitrogen injection, and can be used to calculate the oxygen content of the deoxygenated air in the fourth cylinder.

[0024] Preferably, a second pressure gauge is used to measure the pressure value inside the containment chamber. The second pressure gauge is also used to record the pressure value of the containment chamber during the oxidation process of air injection in a simulated formation water-oil reservoir.

[0025] Preferably, the system further includes a container, a clamp, a temperature probe, a heating plate, and a temperature controller. The container holds the heating medium, the clamp secures the container, the temperature probe measures the temperature of the heating medium, and the temperature controller controls the heating plate to open or close. The temperature probe, the heating plate, and the container are all immersed in the heating medium. The temperature controller controls the heating plate to open and heat the heating medium. When the temperature probe measures that the temperature of the heating medium reaches a predetermined value, the temperature controller controls the heating plate to close, stopping the heating. The heating medium transfers heat to the interior of the container. Therefore, controlling the heating medium to heat to a predetermined temperature can be used to simulate the oxidation effect of oil reservoirs under different temperature conditions. The heating medium is a liquid substance that can act as a heat transfer medium. During the heating process, the heating medium can effectively transfer heat from the heat source to the object being heated, thereby achieving the heating purpose. Substances that can be used as heating media include, for example, water, vegetable oil, and silicone oil.

[0026] Preferably, the outlet of the first outlet valve is connected to a measuring container. The measuring container is used to receive the formation water discharged from the first outlet valve. The volume of the discharged formation water can be quickly measured using the measuring container.

[0027] Preferably, the outlet of the second outlet valve is connected to a gas-liquid separator, which is connected to both a liquid phase collector and a gas phase collector. The liquid phase collector and the gas phase collector are each connected to a gas chromatograph. The crude oil, formation water, and air in the pores of the artificial core, after oxidation, pass through the second outlet valve and enter the gas-liquid separator. The gas-liquid separator separates the oxidized substances into liquid and gas phases, which are then respectively sent to the liquid phase collector and the gas phase collector. The gas chromatograph is used to detect and analyze the composition and content of each component in the liquid and gas phases, thereby assessing the oxidation reaction.

[0028] Preferably, the receiving chamber is a hollow cylinder with a wall thickness of 2mm-3mm and an inner diameter of 40mm-80mm.

[0029] Preferably, the length of the hollow cylinder is 800mm-1200mm.

[0030] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0031] 1. This utility model provides a device for simulating the oxidation effect of air injection in water-bearing oil reservoirs. By sending formation water, crude oil, and air filled in corresponding bottles into the receiving chamber through corresponding pipes, the receiving chamber is used to place artificial rock cores, thereby simulating the oxidation process of air injection in water-bearing oil reservoirs. This solves the problem in the existing air injection oil reservoir oxidation experimental devices that do not consider injecting formation water into the oil reservoir oxidation simulation system, making it difficult to simulate the oxidation effect of water-bearing oil reservoirs. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of an apparatus for simulating the effect of air injection oxidation in water-bearing oil reservoirs.

[0033] Marked in the image:

[0034] 1-Fifth propulsion valve,

[0035] 2-Third propulsion valve,

[0036] 3-Fourth propulsion valve,

[0037] 4-Second propulsion valve,

[0038] 5-First propulsion valve,

[0039] 6-Fifth valve,

[0040] 7-Third valve,

[0041] 8-Fourth valve,

[0042] 9-Second valve,

[0043] 10-First valve,

[0044] 11-Constant flow pump,

[0045] 12 - Fifth bottle body,

[0046] 13-Third bottle body,

[0047] 14 - Fourth bottle body,

[0048] 15-Second bottle body,

[0049] 16-First bottle body,

[0050] 17-Check valve

[0051] 18-First pressure gauge,

[0052] 19-Second pressure gauge,

[0053] 20-Container Box

[0054] 21-Heating medium,

[0055] 22-Clamper,

[0056] 23-Containment compartment,

[0057] 24-Artificial rock core,

[0058] 25-Temperature probe,

[0059] 26-Heating plate,

[0060] 27-Thermostat,

[0061] 28-First outlet valve,

[0062] 29-Second outlet valve,

[0063] 30 - Measuring container

[0064] 31-Gas-liquid separator,

[0065] 32-Liquid phase collector,

[0066] 33-Gas phase collector,

[0067] 34-Gas Chromatograph

[0068] 35 - Main pipe,

[0069] 36-First Pipeline,

[0070] 37-Second Pipeline,

[0071] 38-Fourth Pipeline,

[0072] 39-Third Pipeline,

[0073] 40 - Fifth Pipeline. Detailed Implementation

[0074] The present invention will be further described in detail below with reference to specific embodiments. However, it should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0075] Unless otherwise specified, the use of terms such as "upper," "lower," "left," "right," "center," "inner," and "outer" to indicate orientation or positional relationships in the description of specific embodiments of this utility model is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product / equipment / device is typically placed during use. These terms are merely for the purpose of facilitating the description of the utility model solution or simplifying the description in specific embodiments, enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on this utility model.

[0076] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," and "parallel" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, or parallel, but rather that it can be slightly tilted or have a deviation. For example, "horizontal" merely means that its direction is more horizontal relative to "vertical," not that the structure must be completely horizontal, but can be slightly tilted. Alternatively, it can be simplified to mean that the corresponding device / component / element, when set in a "horizontal," "vertical," "suspended," or "parallel" direction, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.

[0077] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0078] Furthermore, in the description of the embodiments of this utility model, "several", "multiple", and "several" represent at least two. The number can be any number, such as two, three, four, five, six, seven, eight, or nine, and can even exceed nine.

[0079] Furthermore, in the description of the technical solution of this utility model, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "equipped with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0080] Example 1

[0081] like Figure 1 As shown, an apparatus for simulating the effect of air injection oxidation in water-bearing oil reservoirs includes a container 23, a first bottle 16, a second bottle 15, and a fourth bottle 14.

[0082] The first end of the receiving chamber 23 is connected to the first outlet valve 28 and the second outlet valve 29, respectively. Specifically, the receiving chamber 23 is used to hold an artificial core 24 of a matching size, and the left end of the receiving chamber 23 is connected to the first outlet valve 28 and the second outlet valve 29, respectively. The first outlet valve 28 is used to discharge formation water, and the second outlet valve 29 is used to discharge substances from the artificial core 24 after the crude oil oxidation reaction. The shape and size of the receiving chamber 23 should be determined according to the artificial core 24 to be loaded, that is, the cross-sectional shape and length of the internal space of the receiving chamber 23 should match the cross-section and length of the artificial core 24.

[0083] The first bottle 16 is connected to the inlet of the first pipe 36, the outlet of the first pipe 36 is connected to the second end of the receiving chamber 23, and the first pipe 36 is equipped with a first valve 10.

[0084] The second bottle 15 is connected to the inlet of the second pipe 37, the outlet of the second pipe 37 is connected to the second end of the receiving chamber 23, and the second pipe 37 is equipped with a second valve 9.

[0085] The third bottle 13 is connected to the inlet of the third pipe 39, the outlet of the third pipe 39 is connected to the second end of the receiving chamber 23, and the third pipe 39 is equipped with a third valve 7.

[0086] The first bottle 16, the second bottle 15, and the third bottle 13 are used to fill formation water, crude oil, and air, respectively.

[0087] Specifically, the second end of the container 23 can be the right end of the container 23. The first bottle 16 is used to fill formation water, the second bottle 15 is used to fill crude oil, and the third bottle 13 is used to fill air.

[0088] In an optional embodiment, a constant flow pump 11 may also be included. The first bottle 16, the second bottle 15, and the third bottle 13 are respectively connected to the constant flow pump 11 via pipes. A first push valve 5 is provided on the pipe connecting the constant flow pump 11 to the first bottle 16, a second push valve 4 is provided on the pipe connecting the constant flow pump 11 to the second bottle 15, and a third push valve 2 is provided on the pipe connecting the constant flow pump 11 to the third bottle 13. Each of the first bottle 16, the second bottle 15, and the third bottle 13 is equipped with a piston, and the constant flow pump 11 is used to push the medium to squeeze the piston. The constant flow pump 11 is a prior art device, a type of pump capable of maintaining a constant flow output. It mainly controls the flow rate change by automatically adjusting the pump speed or changing the pump outlet valve, thereby achieving a constant flow rate. The working principle of the constant flow pump 11 involves a control system and sensors. These devices can monitor the flow rate at the pump outlet in real time and automatically adjust the pump's operating state when the flow rate deviates from the set value to ensure that the flow rate remains stable at the set value.

[0089] In an optional embodiment, the outlets of the first pipe 36, the second pipe 37, and the third pipe 39 can all be connected to the second end of the receiving chamber 23 via the main pipe 35.

[0090] The main pipe 35 is also connected to the fourth bottle 14 and the fifth bottle 12.

[0091] The fourth cylinder 14 is used to fill the mixed gas. The fourth cylinder 14 is connected to the inlet of the fourth pipe 38, and the outlet of the fourth pipe 38 is connected to the main pipe 35. The fourth cylinder 14 is connected to the constant flow pump 11 through a pipe. The pipe connecting the constant flow pump 11 and the fourth cylinder 14 is equipped with a fourth push valve 3.

[0092] The fifth cylinder 12 is used to fill nitrogen gas. The fifth cylinder 12 is connected to the inlet of the fifth pipe 40, and the outlet of the fifth pipe 40 is connected to the main pipe 35. The fifth pipe 40 is equipped with a fifth valve 6. The fifth cylinder 12 is connected to the constant flow pump 11 through a pipe. The constant flow pump 11 is connected to the fifth cylinder 12 through a fifth push valve 1.

[0093] Both the fourth bottle body 14 and the fifth bottle body 12 are equipped with pistons, and the constant flow pump 11 is used to push the medium to squeeze the pistons.

[0094] The main pipeline 35 is equipped with a check valve 17 and a fourth valve 8.

[0095] The outlets of the third pipe 39 and the fifth pipe 40 are both connected to the inlet of the one-way valve 17, and the outlet of the one-way valve 17 is connected to the fourth pipe 38.

[0096] In an optional embodiment, a first pressure gauge 18 may also be included, which is used to measure the pressure value in the fourth bottle 14. Specifically, as follows... Figure 1As shown, the first pressure gauge 18 can be installed on the main pipe 35. At the same time, the first pressure gauge 18 is connected to the fourth bottle 14 through the main pipe 35 and the fourth pipe 38. The connection does not pass through any other valves or bottles.

[0097] In an optional embodiment, a second pressure gauge 19 may also be included, which is used to measure the pressure value inside the containment chamber 23. Specifically, as shown below... Figure 1 As shown, the second pressure gauge 19 can also be installed on the main pipe 35. The second pressure gauge 19 is connected to the receiving chamber 23 via the main pipe 35, without passing through any other valves or bottles. The artificial rock core 24 is located inside the receiving chamber 23; therefore, the pressure value measured by the second pressure gauge 19 is also the pressure value of the pores of the artificial rock core 24.

[0098] In an optional embodiment, the system may further include a housing 20, a clamp 22, a temperature probe 25, a heating plate 26, and a temperature controller 27. The housing 20 is used to contain the heating medium 21, the clamp 22 is used to fix the housing 23, the temperature probe 25 is used to measure the temperature of the heating medium 21, and the temperature controller 27 is used to control the heating plate 26 to open or close. The heat energy of the heating medium 21 can be transferred to the artificial rock core 24 through the housing 23, thereby enabling the artificial rock core 24 to reach the temperature required for simulation. The temperature probe 25 and the heating plate 26 are both connected to the temperature controller 27 via data cables. The heating medium 21 may specifically be silicone oil. The silicone oil has the following advantages: a wide operating temperature range, good thermal stability, resistance to decomposition or deterioration at high temperatures, and good chemical stability.

[0099] In an optional embodiment, the outlet of the first outlet valve 28 may be connected to a measuring container 30. The measuring container 30 is used to receive formation water discharged from the first outlet valve 28. The measuring container 30 may be a graduated cylinder, a measuring cup, or a graduated beaker.

[0100] In an optional embodiment, the outlet of the second outlet valve 29 can be connected to a gas-liquid separator 31, which is connected to a liquid collector 32 and a gas collector 33, respectively. The liquid collector 32 and the gas collector 33 are connected to a gas chromatograph 34, respectively. Both the gas-liquid separator 31 and the gas chromatograph 34 are existing technologies. The gas-liquid separator 31 is a device used to separate gas and liquid in a liquid-containing system. The gas chromatograph 34 is a laboratory instrument that uses chromatographic separation and detection techniques to perform qualitative and quantitative analysis of complex mixtures with multiple components. It utilizes the different partition coefficients of substances between the stationary and mobile phases, using a carrier gas to carry the sample into the chromatographic column for separation, and then using a detector for detection, thereby obtaining the chemical composition information of the sample.

[0101] In an optional embodiment, the receiving chamber 23 can be a hollow cylinder with a wall thickness of 2mm-3mm, specifically 2mm, 2.5mm, or 3mm. The inner diameter of the hollow cylinder is 40mm-80mm, specifically 40mm, 50mm, 60mm, 70mm, or 80mm. The artificial rock core 24 is matched with the receiving chamber 23; when the receiving chamber 23 is a hollow cylinder, the diameter of the artificial rock core 24 is the same as the inner diameter of the hollow cylinder.

[0102] In an optional embodiment, the length of the hollow cylinder can be 800mm-1200mm, specifically 800mm, 900mm, 1000mm, 1100mm, or 1200mm. The length of the artificial rock core 24 is the same as the length of the hollow cylinder.

[0103] Example 2

[0104] The following is combined with Figure 1 The present invention is described in terms of its application in simulating the oxidation effect of air injection in water-bearing oil reservoirs.

[0105] Preparation phase:

[0106] Prepare the various components of the device according to Example 1, and prepare the corresponding simulation materials. Place an appropriate amount of nitrogen into the fifth cylinder 12, an appropriate amount of air into the third cylinder 13, push the piston of the fourth cylinder 14 to the top to empty it, place an appropriate amount of crude oil into the second cylinder 15, and an appropriate amount of formation water into the first cylinder 16. Place a dried artificial rock core 24, 1000 mm in length and 50 mm in diameter, into a matching container 23, and use clamps 22 to hold the left and right ends of the container 23 to fix it in the container box 20. Pour the heating medium 21, i.e., silicone oil, into the container box 20 and immerse the container 23.

[0107] Water-saturated core stage:

[0108] Open the first propulsion valve 5, the first valve 10, and the first outlet valve 28; close the fifth propulsion valve 1, the third propulsion valve 2, the fourth propulsion valve 3, the second propulsion valve 4, the fifth valve 6, the third valve 7, the fourth valve 8, the second valve 9, and the second outlet valve 29; start the constant flow pump 11, which pushes the medium in the constant flow pump 11 to squeeze the piston at the bottom of the first bottle 16, slowly pushing out the formation water. The formation water enters the receiving chamber 23 from the right side through the first pipe 36 and the main pipe 35. After entering the receiving chamber 23, the formation water continues to pass through the artificial core 24, flows from the left side of the receiving chamber 23 to the first outlet valve 28, and then flows out from the outlet of the first outlet valve 28 into the measuring container 30. Under the action of the constant flow pump 11, the formation water is slowly injected into the artificial core 24, ensuring that the formation water fully enters the pores of the dry artificial core 24. After formation water begins to flow out of the first outlet valve 28, wait for a period of time, then stop the constant flow pump 11 and close the first propulsion valve 5, the first valve 10, and the first outlet valve 28. At this time, the pore volume of the artificial core 24 = formation water injection volume - water volume in the measuring container 30. The difference between the data before and after the constant flow pump 11 starts and stops can be used to obtain the injection volume of the medium, which is the formation water injection volume at this stage.

[0109] Crude oil displacement of formation water stage:

[0110] Open the second propulsion valve 4, the second valve 9, and the first outlet valve 28; close the fifth propulsion valve 1, the third propulsion valve 2, the fourth propulsion valve 3, the first propulsion valve 5, the fifth valve 6, the third valve 7, the fourth valve 8, the first valve 10, and the second outlet valve 29; replace with a new measuring container 30. Start the constant flow pump 11, which pushes the medium in the constant flow pump 11 to squeeze the piston at the bottom of the second bottle 15, slowly pushing out the crude oil. The crude oil enters the receiving chamber 23 from the right side through the second pipe 37 and the main pipe 35. After the crude oil continues to enter the artificial core 24, it displaces the formation water in the pores and flows to the left side of the receiving chamber 23. The displaced formation water flows from the left side of the receiving chamber 23 to the first outlet valve 28, and then flows out from the outlet of the first outlet valve 28 into the new measuring container 30. After formation water begins to flow out of the first outlet valve 28, wait for a period of time, then stop the constant flow pump 11 and close the second propulsion valve 4, the second valve 9, and the first outlet valve 28. At this point, the water saturation of the artificial core 24 is calculated as (pore volume of the artificial core 24 - water volume in the new measuring container 30) / pore volume of the artificial core 24. The longer the displacement time in this stage, the larger the volume of formation water displaced from the artificial core 24 by crude oil. Therefore, the water saturation of the reservoir in the simulation can be controlled by controlling the displacement time.

[0111] Preparation of deoxygenated air stage:

[0112] The nitrogen in the fifth cylinder 12 and the air in the third cylinder 13 both carry a certain pressure. Reconfirm that the piston in the fourth cylinder 14 is pushed to the top to vent it. Open the third valve 7 and close the fifth push valve 1, third push valve 2, fourth push valve 3, second push valve 4, first push valve 5, fifth valve 6, fourth valve 8, second valve 9, first valve 10, first outlet valve 28, and second outlet valve 29. Inject a certain amount of air from the third cylinder 13 into the fourth cylinder 14. Specifically, the air in the third cylinder 13 enters the fourth cylinder 14 through the third pipe 39, main pipe 35, one-way valve 17, and fourth pipe 38. If necessary, the constant flow pump 11 can be started and the third push valve 2 opened to assist in injecting air from the third cylinder 13 into the fourth cylinder 14. After injecting air into the fourth cylinder 14, close the third valve 7 and simultaneously read the pressure value of the first pressure gauge 18, recording it as P1.

[0113] Then, open the fifth valve 6 to inject a certain amount of nitrogen into the fourth cylinder 14. Specifically, the nitrogen in the fifth cylinder 12 enters the fourth cylinder 14 through the fifth pipe 40, main pipe 35, one-way valve 17, and fourth pipe 38. If necessary, the constant flow pump 11 can be started and the fifth push valve 1 opened to assist in injecting the nitrogen from the fifth cylinder 12 into the fourth cylinder 14. After injecting nitrogen into the fourth cylinder 14, close the fifth valve 6 and read the pressure value of the first pressure gauge 18 again, recording it as P2. It should be noted that the temperature of the gas in the fourth cylinder 14 should be the same when reading the pressure value of the first pressure gauge 18 twice. At this time, the gas in the fourth cylinder 14 is deoxygenated air, and the oxygen concentration of the deoxygenated air = 0.21 × P1 / P2 (Note: the oxygen concentration in the air is 21%). Therefore, by controlling the values ​​of P1 and P2, deoxygenated air with different oxygen contents can be obtained.

[0114] Heating stage of the container:

[0115] The heating plate 26 is activated to heat the heating medium 21. The temperature probe 25 transmits the measured temperature signal to the temperature controller 27. When the temperature measured by the temperature probe 25 reaches the predetermined value, the temperature controller 27 controls the heating plate 26 to stop heating. This stage is used to simulate crude oil oxidation under different temperature conditions.

[0116] Phase of injecting deoxygenated air:

[0117] Open the fourth valve 8, and close the fifth propulsion valve 1, the third propulsion valve 2, the fourth propulsion valve 3, the second propulsion valve 4, the first propulsion valve 5, the fifth valve 6, the third valve 7, the second valve 9, the first valve 10, the first outlet valve 28, and the second outlet valve 29. This allows a certain amount of deoxygenated air to be expelled from the fourth cylinder 14. The deoxygenated air then enters the receiving chamber 23 from the right side via the fourth pipe 38 and the main pipe 35. If necessary, the constant flow pump 11 can be started and the fourth propulsion valve 3 opened to assist in injecting the deoxygenated air from the fourth cylinder 14 into the receiving chamber 23. After injecting the deoxygenated air into the receiving chamber 23, close the fourth valve 8 and simultaneously read the pressure value of the second pressure gauge 19, recording it as P3. Therefore, by controlling the amount of deoxygenated air injected, the oxidation of crude oil under different deoxygenated air pressure conditions can be simulated.

[0118] Post-oxidation analysis of crude oil:

[0119] After the oil reservoir in the artificial core 24 with a certain water saturation undergoes an oxidation reaction under predetermined pressure, oxygen-deprived air, and temperature conditions, the second outlet valve 29 is opened, and the fifth propulsion valve 1, third propulsion valve 2, fourth propulsion valve 3, second propulsion valve 4, first propulsion valve 5, fifth valve 6, third valve 7, fourth valve 8, second valve 9, first valve 10, and first outlet valve 28 are closed. At this time, the high-pressure gas (oxidizing flue gas) in the pores of the artificial core 24, carrying oxidized crude oil and formation water, flows to the left side of the receiving chamber 23 and enters the gas-liquid separator 31 through the second outlet valve 29 for gas-liquid phase separation. The oxidizing flue gas enters the gas phase collector 33, and the oxidized crude oil and formation water enter the liquid phase collector 32. A certain amount of gas sample from gas collector 33 and a certain amount of liquid sample from liquid collector 32 are injected into gas chromatograph 34 to measure the contents of CO, CO2, N2, O2, etc. in the oxidized flue gas and the contents of each carbon hydrocarbon component in the oxidized crude oil. The results are then compared with the contents of each component in the deoxygenated air in the fourth bottle 14 and the crude oil before oxidation in the second bottle 15. This allows for a quantitative analysis of the oxidation effect of crude oil under specific conditions.

[0120] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An apparatus for simulating the effect of air injection oxidation in water-bearing oil reservoirs, characterized in that, include: The receiving chamber (23) has its first end connected to the first outlet valve (28) and the second outlet valve (29) respectively; The first bottle (16) is connected to the inlet of the first pipe (36), the outlet of the first pipe (36) is connected to the second end of the container (23), and the first pipe (36) is provided with a first valve (10). The second bottle (15) is connected to the inlet of the second pipe (37), the outlet of the second pipe (37) is connected to the second end of the receiving chamber (23), and the second pipe (37) is provided with a second valve (9). The third bottle (13) is connected to the inlet of the third pipe (39), the outlet of the third pipe (39) is connected to the second end of the receiving chamber (23), and the third pipe (39) is provided with a third valve (7). The first bottle (16), the second bottle (15) and the third bottle (13) are respectively used to fill formation water, crude oil and air.

2. The apparatus for simulating the effect of air injection oxidation in water-bearing oil reservoirs according to claim 1, characterized in that, It also includes a constant flow pump (11). The first bottle (16), the second bottle (15) and the third bottle (13) are respectively connected to the constant flow pump (11) through pipes. A first push valve (5) is provided on the pipe connecting the constant flow pump (11) and the first bottle (16). A second push valve (4) is provided on the pipe connecting the constant flow pump (11) and the second bottle (15). A third push valve (2) is provided on the pipe connecting the constant flow pump (11) and the third bottle (13). The first bottle (16), the second bottle (15) and the third bottle (13) are all provided with pistons. The constant flow pump (11) is used to push the medium to squeeze the pistons.

3. The apparatus for simulating the effect of air injection oxidation in water-bearing oil reservoirs according to claim 2, characterized in that, The outlets of the first pipe (36), the second pipe (37), and the third pipe (39) are all connected to the second end of the container (23) via the main pipe (35); The main pipe (35) is also connected to the fourth bottle (14) and the fifth bottle (12). The fourth bottle (14) is used to fill the mixed gas. The fourth bottle (14) is connected to the inlet of the fourth pipe (38). The outlet of the fourth pipe (38) is connected to the main pipe (35). The fourth bottle (14) is connected to the constant flow pump (11) through a pipe. A fourth push valve (3) is provided on the pipe connecting the constant flow pump (11) and the fourth bottle (14). The fifth cylinder (12) is used to fill nitrogen gas. The fifth cylinder (12) is connected to the inlet of the fifth pipe (40). The outlet of the fifth pipe (40) is connected to the main pipe (35). The fifth pipe (40) is provided with a fifth valve (6). The fifth cylinder (12) is connected to the constant flow pump (11) through a pipe. The constant flow pump (11) is connected to the fifth cylinder (12) through a fifth push valve (1). Both the fourth bottle (14) and the fifth bottle (12) are equipped with pistons, and the constant flow pump (11) is used to push the medium to squeeze the pistons; The main pipeline (35) is equipped with a check valve (17) and a fourth valve (8); The outlet of the third pipe (39) and the outlet of the fifth pipe (40) are both connected to the inlet of the one-way valve (17), and the outlet of the one-way valve (17) is connected to the fourth pipe (38).

4. The apparatus for simulating the effect of air injection oxidation in water-bearing oil reservoirs according to claim 3, characterized in that, It also includes a first pressure gauge (18) for measuring the pressure value in the fourth bottle (14).

5. The apparatus for simulating the effect of air injection oxidation in water-bearing oil reservoirs according to claim 3, characterized in that, It also includes a second pressure gauge (19) for measuring the pressure value inside the containment chamber (23).

6. The apparatus for simulating the effect of air injection oxidation in water-bearing oil reservoirs according to any one of claims 1-5, characterized in that, It also includes a container (20), a clamp (22), a temperature probe (25), a heating plate (26), and a temperature controller (27). The container (20) is used to contain the heating medium (21), the clamp (22) is used to fix the container (23), the temperature probe (25) is used to measure the temperature of the heating medium (21), and the temperature controller (27) is used to control the heating plate (26) to open or close.

7. The apparatus for simulating the effect of air injection oxidation in water-bearing oil reservoirs according to claim 6, characterized in that, The outlet of the first outlet valve (28) is connected to a measuring container (30).

8. The apparatus for simulating the effect of air injection oxidation in water-bearing oil reservoirs according to claim 6, characterized in that, The outlet of the second outlet valve (29) is connected to a gas-liquid separator (31), which is connected to a liquid phase collector (32) and a gas phase collector (33), respectively. The liquid phase collector (32) and the gas phase collector (33) are connected to a gas chromatograph (34).

9. The apparatus for simulating the effect of air injection oxidation in water-bearing oil reservoirs according to claim 6, characterized in that, The container (23) is a hollow cylinder with a wall thickness of 2mm-3mm and an inner diameter of 40mm-80mm.

10. The apparatus for simulating the effect of air injection oxidation in water-bearing oil reservoirs according to claim 9, characterized in that, The length of the hollow cylinder is 800mm-1200mm.

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