CN112780263B - Experimental device for monitoring interphase dynamic diffusion of fracture-cavity oil reservoir gas injection tracer and application method thereof - Google Patents
Experimental device for monitoring interphase dynamic diffusion of fracture-cavity oil reservoir gas injection tracer and application method thereof Download PDFInfo
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Abstract
本发明的目的在于提供一种监测缝洞油藏注气示踪剂相间动态扩散的实验装置及其使用方法，能够实现模拟油气两相缝洞储层中注气体示踪剂的渗流过程，动态监测出气体示踪剂在高温高压条件下向原油中的溶解扩散；为达到上述目的，本发明的解决方法是提供一种监测缝洞油藏注气示踪剂相间动态扩散的实验装置，包括:缝洞储层模拟系统、多相流体注入系统、油气分离系统、原油混合分析系统和计量分析系统。
The purpose of the present invention is to provide an experimental device for monitoring the dynamic diffusion of gas tracers injected into fracture-cavity oil reservoirs and a method for using the same, which can simulate the seepage process of gas tracers injected into oil-gas two-phase fracture-cavity reservoirs and dynamically monitor the dissolution and diffusion of gas tracers into crude oil under high temperature and high pressure conditions. To achieve the above purpose, the solution of the present invention is to provide an experimental device for monitoring the dynamic diffusion of gas tracers injected into fracture-cavity oil reservoirs, comprising: a fracture-cavity reservoir simulation system, a multiphase fluid injection system, an oil-gas separation system, a crude oil mixing analysis system and a metering analysis system.
Description
Technical Field
The invention relates to the field of oil and gas field development technology simulation, in particular to an experimental device for monitoring interphase dynamic diffusion of a gas injection tracer of a fracture-cavity oil reservoir and a use method thereof.
Background
Carbonate reservoir oil-gas resources occupy an important role in global petroleum resources, and the carbonate reservoir oil-gas resources occupy more than half of the global total oil-gas resources; the fracture-cavity type carbonate reservoir is extremely strong in heterogeneity, various in reservoir space and complex in reservoir type; because of developing large-scale cracks and karst cave, the seepage storage mode and flow mechanism of the large-scale cracks and karst cave show complex characteristics.
The fracture-cavity oil reservoir takes a fracture-cavity reservoir body unit as a main development object, and one fracture-cavity unit is an independent trap space. In the development of fracture-cavity reservoirs, after a certain period of production, the oil well often cannot lead to yield reduction due to insufficient energy. For production wells in a well group in the same fracture-cavity unit, a well group water injection and gas injection method is often adopted to improve the stratum energy, so that higher and stable recovery ratio is obtained. Therefore, the evaluation of the communication among wells of the same fracture-cavity unit well group, the underground fracture-cavity distribution and the recognition of the residual oil distribution of the blocks play a key role in the arrangement of the field water injection well pattern and the setting of parameters.
The tracer test technology can accurately evaluate the wave conditions of the fluid and know the flow direction and flow speed information of the injected fluid. The development condition of fissure cavity and the residual oil distribution of the block are determined, so that a positive guiding effect is played for further understanding the heterogeneous characteristics of the fracture-cavity oil reservoir and the formation fracture-cavity communication relationship and distribution. At present, a small amount of research on monitoring of a gas tracer exists in China, the response of the gas tracer is monitored by injecting the gas tracer into an injection well and sampling in a production well, so that a response curve of the gas tracer is drawn, and finally, the formation characteristic parameters are inversed by fitting a theoretical curve and an actual measurement curve.
According to the phase theory and the diffusion theory, the gas tracer can be continuously dissolved and diffused into crude oil in the flowing process, so that the retention loss of the tracer is caused, the types of the tracer are different, the stratum conditions are different, and the dissolution and diffusion amounts are also different. If the dissolution and diffusion factors of the gas tracer in the oil and water are not considered, larger errors are caused to the interpretation results of the on-site tracer monitoring. At present, experimental devices for experimental and testing the dissolution and diffusion of a gas tracer to oil-water in a stratum are all based on static experiments, but the actual site situation is that each phase of the oil-gas-water and the gas tracer is in a dynamic process, so that dynamic simulation test is needed.
CN106837317a discloses a method and system for petroleum filling simulation of tight reservoirs, the method comprising: acquiring a first sample corresponding to a tight reservoir and a second sample corresponding to a target hydrocarbon source rock; preprocessing a first sample, performing tectorial physical property measurement and stratum water injection, and obtaining first data; determining total organic carbon, pyrolysis and maturity of the second sample, and performing open-system hydrocarbon generation kinetics test on the second sample with maturity lower than a preset value to obtain second data; determining a source storage configuration relation of the tight reservoir according to logging information, first and second information, and filling first and second samples according to the relation to obtain a simulation sample; according to the buried history and thermal history of the stratum, the temperature and pressure of the stratum nowadays are measured after carrying out a geological process constraint simulation experiment on a simulation sample, and the petroleum distribution condition is determined.
Therefore, the experimental device for monitoring interphase dynamic diffusion of the gas injection tracer of the fracture-cavity oil reservoir and the application method thereof are provided in the field of oil-gas field development technology simulation in a targeted manner, and are technical problems to be solved urgently.
Disclosure of Invention
The invention aims to provide an experimental device for monitoring interphase dynamic diffusion of a gas injection tracer of a fracture-cavity oil reservoir and a use method thereof, which can realize simulation of a seepage process of the gas injection tracer in an oil-gas two-phase fracture-cavity reservoir and dynamic monitoring of the dissolution and diffusion amount of the gas injection tracer in crude oil under high-temperature high-pressure conditions.
In order to achieve the aim, the invention provides an experimental device for monitoring interphase dynamic diffusion of a gas injection tracer of a fracture-cavity oil reservoir, which comprises a fracture-cavity reservoir simulation system, a multiphase fluid injection system, an oil-gas separation system, a crude oil mixing analysis system and a metering analysis system;
the fracture-cavity reservoir simulation system is used for simulating the environment of the fracture-cavity carbonate reservoir;
The multiphase fluid injection system is used for injecting gas, crude oil and tracer into the fracture-cavity reservoir simulation system;
The oil-gas separation system is used for separating oil-gas mixed fluid flowing out from the outlet end of the fracture-cave reservoir simulation system into oil-phase fluid and gas phase;
the crude oil mixing analysis system is used for analyzing the proportion of crude oil components in the fracture-cavity reservoir simulation system;
the metering analysis system is used for analyzing the concentration of the tracer in the oil phase fluid and the gas phase separated by the oil-gas separation system.
Further, the fracture and cave reservoir simulation system comprises a fracture and cave reservoir etching model, a pressure gauge II, a back pressure pump I, a back pressure valve III, a valve H and a constant temperature box, wherein the back pressure pump I, the fracture and cave reservoir etching model and the pressure gauge II are positioned in the constant temperature box, the back pressure valve III is connected with an outlet end of the fracture and cave reservoir etching model through a pipeline, the back pressure pump I is connected with the back pressure valve III through a pipeline, and the pressure gauge II is positioned on a pipeline connected with the back pressure valve III through the fracture and cave reservoir etching model and is connected with the back pressure valve III, and the valve H is arranged on the pipeline connected with the back pressure pump I and the back pressure valve III.
Further, the multiphase fluid injection system comprises a gas injection system, an oil injection system, a water injection system, a pressure regulating system, a pressure gauge I and a collecting pipe, wherein the gas injection system, the oil injection system, the water injection system and the pressure regulating system are intersected at the inlet end of the collecting pipe through pipelines, the pressure gauge I is positioned on the collecting pipe, and the outlet end of the collecting pipe is connected with the inlet end of the fracture-cave reservoir etching model.
Further, the gas injection system comprises a gas injection pump, a valve A, an intermediate container I and a valve B, wherein the gas injection pump, the valve A, the intermediate container I, the valve B and the manifold are sequentially connected through pipelines;
The water injection system comprises a constant-pressure constant-speed pump I, a valve D, an intermediate container II and a valve C, wherein the constant-pressure constant-speed pump I, the valve D, the intermediate container II, the valve C and the manifold are sequentially connected through pipelines;
The oil injection system comprises a constant-pressure constant-speed pump II, a valve E, an intermediate container III and a valve F, wherein the constant-pressure constant-speed pump II, the valve E, the intermediate container III, the valve F and the manifold are sequentially connected through pipelines;
the pressure regulating system comprises a vacuum pump and a valve G, and the vacuum pump, the valve G and the manifold are sequentially connected through pipelines.
Further, the intermediate container I, the valve B, the intermediate container II, the valve C, the intermediate container III, the valve F, the valve G, the manifold, and the pressure gauge I are located inside the incubator.
Further, the oil-gas separation system comprises an oil-gas separator, a liquid level sensor, an automatic electric control valve, a back pressure pump II, a back pressure valve I, a back pressure valve II and a valve I; the upper part of the oil-gas separator is connected with the back pressure valve II through a pipeline, the lower part of the oil-gas separator is connected with the automatic electric control valve through a pipeline, the oil-gas separator is provided with the liquid level sensor, the liquid level sensor is connected with the oil-gas separator through an electric pipeline, the back pressure valve II is connected with the back pressure pump II through a pipeline, the automatic electric control valve is connected with the back pressure valve I through a pipeline, and the oil-gas separator is connected with the back pressure valve III through a pipeline; a valve L is arranged on a pipeline connected with the oil-gas separator and the back pressure valve III, and a valve I is arranged on a pipeline connected with the back pressure valve II and the back pressure pump II; the oil-gas separator, the liquid level sensor and the valve L are positioned inside the constant temperature box.
Further, the crude oil mixing analysis system comprises a valve M, a vacuum bottle and a gas meter II, wherein the vacuum bottle is connected with the gas meter II through a pipeline, the vacuum bottle is intersected with a pipeline connected between the oil-gas separator and the back pressure valve III through a pipeline, and the valve M is arranged on the pipeline; the valve M is positioned inside the incubator.
Further, the metering analysis system comprises a throttle valve, a tracer collector I, a tracer collector II, a tracer analyzer, a computer, a valve K, a valve J, a triangular flask and a gas meter I, wherein the throttle valve, the tracer collector I, the tracer analyzer and the computer are sequentially connected through pipelines, the throttle valve I, the valve J, the triangular flask I and the gas meter I are sequentially connected through pipelines, and the tracer analyzer, the tracer collector II and the triangular flask I are sequentially connected through pipelines.
The invention also provides a use method of the experimental device for monitoring the interphase dynamic diffusion of the gas injection tracer of the fracture-cavity oil reservoir, a stratum fluid system is firstly constructed, a constant temperature box is regulated to a proper temperature, stratum water is injected into the fracture-cavity reservoir etching model by using the water injection system, dead oil and active oil are sequentially injected into the fracture-cavity reservoir etching model by using the oil injection system, when the oil-gas-water ratio of crude oil flowing out into a vacuum bottle is the same as the underground active oil-gas ratio, the oil injection system is stopped, the structure of the stratum fluid system is completed, the dead oil and the active oil are the same experimental oil, the dead oil is the experimental oil which is not movable in a displacement experiment, and the active oil is the experimental oil which is movable in the displacement experiment;
using the gas injection system to displace the oil-water mixture in the fracture-cavity reservoir etching model by using the mixed gas of the tracer and N 2, wherein the tracer is octafluorocyclobutane, the injected gas displaces the oil-water mixture in the fracture-cavity reservoir etching model to form an oil-gas mixed fluid, the oil-gas mixed fluid flows out of the outlet end of the fracture-cavity reservoir etching model and enters the oil-gas separation system, and the oil-gas separation system separates the oil-gas mixed fluid into gas phase fluid and oil phase fluid;
the gas phase enters the tracer collector I from the outlet at the upper end of the oil-gas separator through a throttle valve, gas phase samples at different times are acquired by the tracer collector I, the concentration of the tracer in the gas phase samples is analyzed by the tracer analyzer, and a change curve of the concentration of the tracer with time is output by the computer connected with the tracer analyzer, so that a corresponding tracer response curve in the gas phase is obtained;
After the oil phase fluid flows out of the lower part of the oil-gas separator, the oil phase fluid flows into the triangular flask through a pipeline and is degassed, the quantity of crude oil in the oil phase fluid can be calculated by measuring the front-rear mass change of the triangular flask, the quality of the removed gas is measured by the gas meter I, meanwhile, the removed gas enters the tracer collector II, gas samples removed at different moments are collected by the tracer collector II, the concentration of the tracer in the collected gas samples is analyzed by the tracer analyzer, and finally the dissolution and diffusion proportion of the tracer in the crude oil is converted.
The invention has the following advantages:
1. According to the invention, the actual reservoir fracture-cavity is simulated through the fracture-cavity reservoir etching model, so that the flow process of a plurality of fluids in the fracture-cavity can be accurately simulated, and the method has an actual guiding effect on actual development and research of fracture-cavity oil reservoirs;
2. The fracture-cavity reservoir etching model can be manufactured into different forms and sizes according to the actual fracture-cavity reservoir characteristics, can meet reservoir simulation of different fracture-cavity distributions, and can be replaced according to the needs, so that the fracture-cavity reservoir etching model has wide applicability.
Drawings
FIG. 1 is a schematic diagram of an experimental device for monitoring interphase dynamic diffusion of a gas injection tracer of a fracture-cavity oil reservoir;
In the figure, 1-gas injection pump, 2-valve A, 3-intermediate container I, 4-valve B, 5-valve C, 6-intermediate container II, 7-valve D, 8-constant pressure constant speed pump I, 9-constant pressure constant speed pump II, 10-valve E, 11-intermediate container III, 12-valve F, 13-vacuum pump, 14-valve G, 15-manifold, 16-pressure gauge I, 17-back pressure pump I, 18-valve H, 19-back pressure pump II, 20-valve I, 21-tracer collector I, 22-tracer analyzer, 23-computer, 24-tracer collector II, 25-gas meter I, 26-triangular flask, 27-valve J, 28-back pressure valve I, 29-throttle valve, 30-back pressure valve II, 31-valve K, 32-automatic electric control valve, 33-gas meter II, 34-level sensor, 35-valve L, 36-oil separator, 37-valve M, 38-back pressure gauge II, 39-back pressure gauge III, 40-pressure gauge hole pattern, 41-reservoir.
Examples
The objects, technical solutions and advantages of the embodiments of the present invention will be more apparent, and the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
Example 1
As shown in FIG. 1, the experimental device for monitoring interphase dynamic diffusion of the gas injection tracer of the fracture-cavity oil reservoir comprises a fracture-cavity reservoir simulation system, a multiphase fluid injection system, an oil-gas separation system, a crude oil mixing analysis system and a metering analysis system; the fracture-cavity reservoir simulation system is used for simulating the environment of the fracture-cavity carbonate reservoir; the multiphase fluid injection system is used for injecting gas, crude oil and tracer into the fracture-cavity reservoir simulation system; the oil-gas separation system is used for separating oil-gas mixed fluid flowing out from the outlet end of the fracture-cave reservoir simulation system into oil-phase fluid and gas phase; the crude oil mixing analysis system is used for analyzing the proportion of crude oil components in the fracture-cavity reservoir simulation system; the metering analysis system is used for analyzing the concentration of the tracer in the oil phase fluid and the gas phase separated by the oil-gas separation system.
Example 2
The fracture-cavity reservoir simulation system comprises a fracture-cavity reservoir etching model 41, a pressure gauge II40, a back pressure pump I17, a back pressure valve III39, a valve H18 and a constant temperature box 42, wherein the back pressure pump I17, the fracture-cavity reservoir etching model 41 and the pressure gauge II40 are positioned in the constant temperature box 42, the back pressure valve III39 is connected with the outlet end of the fracture-cavity reservoir etching model 41 through a pipeline, the back pressure pump I17 is connected with the back pressure valve III39 through a pipeline, and the pressure gauge II40 is positioned on the pipeline connecting the fracture-cavity reservoir etching model 41 with the back pressure valve III39, and the valve H18 is arranged on the pipeline connecting the back pressure pump I17 with the back pressure valve III 39.
The multiphase fluid injection system comprises a gas injection system, an oil injection system, a water injection system, a pressure regulating system, a pressure gauge I16 and a collecting pipe 15, wherein the gas injection system, the oil injection system, the water injection system and the pressure regulating system are intersected at the inlet end of the collecting pipe 15 through pipelines, the pressure gauge I16 is positioned on the collecting pipe 15, and the outlet end of the collecting pipe 15 is connected with the inlet end of the fracture-cavity reservoir etching model 41.
The gas injection system comprises a gas injection pump 1, a valve A2, an intermediate container I3 and a valve B4, wherein the gas injection pump 1, the valve A2, the intermediate container I3, the valve B4 and the manifold 15 are sequentially connected through pipelines; the water injection system comprises a constant-pressure constant-speed pump I8, a valve D7, an intermediate container II6 and a valve C5, wherein the constant-pressure constant-speed pump I8, the valve D7, the intermediate container II6, the valve C5 and the collecting pipe 15 are sequentially connected through pipelines; the oil injection system comprises a constant pressure constant speed pump II9, a valve E10, an intermediate container III11 and a valve F12, wherein the constant pressure constant speed pump II9, the valve E10, the intermediate container III11, the valve F12 and the collecting pipe 15 are sequentially connected through pipelines; the pressure regulating system comprises a vacuum pump 13 and a valve G14, wherein the vacuum pump 13, the valve G14 and the manifold 15 are sequentially connected through pipelines.
The intermediate container I3, the valve B4, the intermediate container II6, the valve C5, the intermediate container III11, the valve F12, the valve G14, the manifold 15 and the pressure gauge I16 are located inside the incubator 42.
The oil-gas separation system comprises an oil-gas separator 36, a liquid level sensor 34, an automatic electric control valve 32, a back pressure pump II19, a back pressure valve I28, a back pressure valve II30 and a valve I20; the upper part of the oil-gas separator 36 is connected with the back pressure valve II30 through a pipeline, the lower part of the oil-gas separator 36 is connected with the automatic electric control valve 32 through a pipeline, the oil-gas separator 36 is provided with the liquid level sensor 34, the liquid level sensor 34 is connected with the oil-gas separator 36 through an electric pipeline, the back pressure valve II30 is connected with the back pressure pump II19 through a pipeline, the automatic electric control valve 32 is connected with the back pressure valve I28 through a pipeline, and the oil-gas separator 36 is connected with the back pressure valve III39 through a pipeline; a valve L35 is arranged on a pipeline connected with the oil-gas separator 36 and the back pressure valve III39, and a valve I20 is arranged on a pipeline connected with the back pressure valve II30 and the back pressure pump II 19; the gas-oil separator 36, the liquid level sensor 34 and the valve L35 are located inside the incubator 42.
The crude oil mixing analysis system comprises a valve M37, a vacuum bottle 38 and a gas meter II33, wherein the vacuum bottle 38 is connected with the gas meter II33 through a pipeline, the vacuum bottle 38 is intersected with a pipeline connected with the oil-gas separator 36 and the back pressure valve III39 through a pipeline, and the valve M37 is arranged on the pipeline; the valve M37 is located inside the incubator 42.
The metering analysis system comprises a throttle valve 29, a tracer collector I21, a tracer collector II24, a tracer analyzer 22, a computer 23, a valve K31, a valve J27, a triangular flask 26 and a gas meter I25, wherein a back pressure valve II30, the valve K31, the throttle valve 29, the tracer collector I21, the tracer analyzer 22 and the computer 23 are sequentially connected through pipelines, a back pressure valve I28, the valve J27, the triangular flask 26 and the gas meter I25 are sequentially connected through pipelines, and the tracer analyzer 22, the tracer collector II24 and the triangular flask 26 are sequentially connected through pipelines.
Example 3
The invention further provides an experimental step embodiment of an experimental device for monitoring interphase dynamic diffusion of the gas injection tracer of the fracture-cavity oil reservoir, which comprises the following steps:
S1, cleaning a pipeline;
S2, the vacuum pump 13 vacuumizes the intermediate container I3, the intermediate container II6 and the intermediate container III11, and then closes all valves;
S3, reservoir fluid sample preparation experimental steps under stratum conditions comprise:
s31, adjusting the temperature of the incubator 42 to the stratum temperature required to be simulated, and keeping stable;
S32, opening the valve D7, injecting stratum water into the intermediate container II6, stopping injection after the pressure in the intermediate container II6 is stable, and closing the valve D7;
s33, setting the pressure of the back pressure pump I17, opening the valve M37, the valve C5 and the valve D7, setting the pressure of the constant pressure constant speed pump I8, slowly displacing the stratum water in the intermediate container II6 by the constant pressure constant speed pump I8, enabling the stratum water to enter the fracture-cavity reservoir etching model 41, enabling the stratum water to saturate the fracture-cavity reservoir etching model 41 after a period of time, and enabling the stratum water to flow into the vacuum bottle 38;
S34, closing the valve C5 and the valve D7, opening the valve E10, injecting dead oil into the intermediate container III11, stopping injecting the dead oil after the pressure in the intermediate container III11 is stable, and closing the valve E10;
S35, opening the valve F12, setting the pressure of the constant-pressure constant-speed pump II9, opening the valve E10, slowly displacing dead oil in the intermediate container III11 by the constant-pressure constant-speed pump II9, enabling the dead oil to enter the fracture-cavity reservoir etching model 41, enabling the dead oil to flow into the vacuum bottle 38 after a period of time after saturating the fracture-cavity reservoir etching model 41, and closing the constant-pressure constant-speed pump II9 and closing the valve F12 when the dead oil flowing into the vacuum bottle 38 is completely free of water;
S36, injecting living oil under stratum conditions into the intermediate container III11, stopping injecting the living oil after the pressure in the intermediate container III11 is stable, and closing the valve E10;
S37, opening the valve F12, setting the pressure of the constant-pressure constant-speed pump II9, opening the valve E10, slowly displacing the active oil in the intermediate container III11 by the constant-pressure constant-speed pump II9, enabling the active oil to enter the fracture-cavity reservoir etching model 41, enabling the active oil to saturate the fracture-cavity reservoir etching model 41 after a period of time and then flow into the vacuum bottle 38, closing the constant-pressure constant-speed pump II9 and the back-pressure pump I17 when the oil-gas-water ratio of crude oil flowing out into the vacuum bottle 38 is the same as the oil-gas ratio of underground active oil, closing the valve E10, the valve F12 and the valve M37, and completing the formation fluid system with bound water and residual oil;
S4, opening the valve A2, injecting a certain amount of gas tracer into the intermediate container I3, and stopping injection after the pressure in the container is stable;
S5, opening the valve L35, the valve I20, the valve K31 and the valve J27, setting the pressure of the back pressure pump II19, opening the valve B4, setting the pressure of the gas injection pump 1, continuously injecting N2 into the intermediate container I3 through the gas injection pump 1, and displacing the oil-water mixture in the fracture-cavity reservoir etching model 41 by injection gas after the N2 is mixed with the tracer slugs in the intermediate container I3;
S6, displacing the oil-water mixture in the fracture-cavity reservoir etching model 41 by the injected gas to form an oil-gas mixed fluid, enabling the oil-gas mixed fluid to flow out of the outlet end of the fracture-cavity reservoir etching model 41 and enter the oil-gas separator 36, enabling gas phase to enter the tracer collector I21 from the outlet of the upper end of the oil-gas separator 36 through the throttle valve 29, collecting gas phase samples at different moments by the tracer collector I21, analyzing the concentration of the tracer in the gas phase samples by the tracer analyzer 22, and outputting a time-varying curve of the concentration of the tracer by the computer 23 connected with the tracer analyzer 22 to obtain a corresponding tracer response curve in the gas phase;
And S7, after the oil phase fluid flows out of the lower part of the oil-gas separator 36, as the liquid level sensor 34 is arranged on the oil-gas separator 36, when the liquid level is higher than a certain threshold value, the liquid level sensor 34 controls the automatic electric control valve 32 to be opened, the oil phase fluid flows into the triangular flask 26 through a pipeline and is degassed, the amount of crude oil in the oil phase fluid can be calculated by measuring the front-rear mass change of the triangular flask 26, the quality of the removed gas is measured by the gas meter I25, meanwhile, the removed gas enters the tracer collector II24, the tracer concentration in the gas sample obtained by the analysis of the tracer analyzer 22 is utilized, and finally the dissolution and diffusion proportion of the tracer in the crude oil is converted.
The invention has the following advantages:
1. The fracture-cavity reservoir etching model 41 is a three-dimensional model which is inverted through seismic data and is consistent with the actual fracture-cavity distribution and shape of the reservoir, and the invention can accurately simulate the flowing process of multiphase fluid in the fracture-cavity reservoir, thereby having direct guiding significance for the development and research of fracture-cavity type reservoirs;
2. The liquid level sensor 34 is arranged in the oil-gas separator 36, and the opening and closing of the automatic electric control valve 32 are controlled by monitoring the liquid level position, so that the gas phase in the oil-gas separator 36 is accurately controlled not to flow out from the bottom oil phase outlet;
3. The produced gas flows into the tracer collector I21 from the upper end of the oil-gas separator 36 through the back pressure valve II30, and the concentration of the tracer in the gas phase can be monitored in real time through the tracer analyzer 22;
4. The produced liquid flows into the triangular flask 26 through the automatic electric control valve 32 at the outlet of the lower end of the oil-gas separator 36 to be degassed and separated at normal temperature and normal pressure, and the proportion of the dissolved and diffused amount of the gas in the crude oil can be measured by detecting the tracer in the removed gas;
5. the fracture-cavity reservoir etching model 41 can be manufactured into different forms and sizes according to the actual fracture-cavity reservoir characteristics, can meet reservoir simulation of different fracture-cavity distributions, can be replaced according to the needs, and therefore has wide applicability.
It is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments, and that all other embodiments obtained by persons of ordinary skill in the art without making creative efforts based on the embodiments of the present invention are within the protection scope of the present invention.
Claims (8)
1. An experimental device for monitoring interphase dynamic diffusion of a gas injection tracer of a fracture-cavity oil reservoir comprises a fracture-cavity reservoir simulation system, a multiphase fluid injection system, an oil-gas separation system, a crude oil mixing analysis system and a metering analysis system;
the fracture-cavity reservoir simulation system is used for simulating the environment of the fracture-cavity carbonate reservoir;
The multiphase fluid injection system is used for injecting gas, crude oil and tracer into the fracture-cavity reservoir simulation system;
The oil-gas separation system is used for separating oil-gas mixed fluid flowing out from the outlet end of the fracture-cave reservoir simulation system into oil-phase fluid and gas phase;
the crude oil mixing analysis system is used for analyzing the proportion of crude oil components in the fracture-cavity reservoir simulation system;
The oil-gas separation system comprises an oil-gas separator (36), a liquid level sensor (34), an automatic electric control valve (32), a back pressure pump II (19), a back pressure valve I (28), a back pressure valve II (30) and a valve I (20); the upper part of the oil-gas separator (36) is connected with the back pressure valve II (30) through a pipeline, the lower part of the oil-gas separator (36) is connected with the automatic electric control valve (32) through a pipeline, the liquid level sensor (34) is arranged on the oil-gas separator (36), the liquid level sensor (34) is connected with the oil-gas separator (36) through an electric pipeline, the back pressure valve II (30) is connected with the back pressure pump II (19) through a pipeline, the automatic electric control valve (32) is connected with the back pressure valve I (28) through a pipeline, and a valve I (20) is arranged on a pipeline connecting the back pressure valve II (30) with the back pressure pump II (19);
The metering analysis system is used for analyzing the concentration of the tracer in the oil phase fluid and the gas phase separated by the oil-gas separation system; the metering analysis system comprises a throttle valve (29), a tracer collector I (21), a tracer collector II (24), a tracer analyzer (22), a computer (23), a valve K (31), a valve J (27), a triangular flask (26) and a gas meter I (25), wherein the back pressure valve II (30), the valve K (31), the throttle valve (29), the tracer collector I (21), the tracer analyzer (22) and the computer (23) are sequentially connected through pipelines, the back pressure valve I (28), the valve J (27), the triangular flask (26) and the gas meter I (25) are sequentially connected through pipelines, and the tracer analyzer (22), the tracer collector II (24) and the triangular flask (26) are sequentially connected through pipelines;
The produced gas flows into the tracer collector I (21) from the upper end of the oil-gas separator (36) through the back pressure valve II (30), and the concentration of the tracer in the gas phase can be monitored in real time through the tracer analyzer (22); the produced liquid flows into a triangular flask (26) through an automatic electric control valve (32) at the outlet of the lower end of an oil-gas separator (36) to be degassed and separated at normal temperature and normal pressure, and the proportion of the dissolved and diffused amount of the gas in crude oil can be measured by detecting the tracer in the separated gas of the produced liquid.
2. The experimental device for monitoring interphase dynamic diffusion of a fracture-cavity oil reservoir gas injection tracer according to claim 1, wherein the fracture-cavity reservoir simulation system comprises a fracture-cavity reservoir etching model (41), a pressure gauge II (40), a back pressure pump I (17), a back pressure valve III (39), a valve H (18) and a constant temperature box (42), the fracture-cavity reservoir etching model (41) and the pressure gauge II (40) are located in the constant temperature box (42), the back pressure valve III (39) is connected with an outlet end of the fracture-cavity reservoir etching model (41) through a pipeline, the back pressure pump I (17) is connected with the back pressure valve III (39) through a pipeline, and the pressure gauge II (40) is located on the pipeline connecting the fracture-cavity reservoir etching model (41) with the back pressure valve III (39), and the valve H (18) is arranged on the pipeline connecting the back pressure pump I (17) with the back pressure valve III (39).
3. An experimental device for monitoring interphase dynamic diffusion of a gas injection tracer for a fracture-cavity reservoir according to claim 2, wherein the multiphase fluid injection system comprises a gas injection system, an oil injection system, a water injection system, a pressure regulating system, a pressure gauge I (16) and a collecting pipe (15), the gas injection system, the oil injection system, the water injection system and the pressure regulating system are intersected at an inlet end of the collecting pipe (15) through pipelines, the pressure gauge I (16) is located on the collecting pipe (15), and an outlet end of the collecting pipe (15) is connected with an inlet end of an etching model (41) of the fracture-cavity reservoir.
4. An experimental device for monitoring interphase dynamic diffusion of a gas injection tracer for a fracture-cavity reservoir as claimed in claim 3, wherein,
The gas injection system comprises a gas injection pump (1), a valve A (2), an intermediate container I (3) and a valve B (4), wherein the gas injection pump (1), the valve A (2), the intermediate container I (3), the valve B (4) and the manifold (15) are sequentially connected through pipelines;
The water injection system comprises a constant-pressure constant-speed pump I (8), a valve D (7), an intermediate container II (6) and a valve C (5), wherein the constant-pressure constant-speed pump I (8), the valve D (7), the intermediate container II (6), the valve C (5) and the collecting pipe (15) are sequentially connected through pipelines;
The oil injection system comprises a constant-pressure constant-speed pump II (9), a valve E (10), an intermediate container III (11) and a valve F (12), wherein the constant-pressure constant-speed pump II (9), the valve E (10), the intermediate container III (11), the valve F (12) and the collecting pipe (15) are sequentially connected through pipelines;
The pressure regulating system comprises a vacuum pump (13) and a valve G (14), and the vacuum pump (13), the valve G (14) and the manifold (15) are sequentially connected through pipelines.
5. An experimental device for monitoring interphase dynamic diffusion of a gas injection tracer for a fracture-cave reservoir according to claim 4, wherein the intermediate container I (3), the valve B (4), the intermediate container II (6), the valve C (5), the intermediate container III (11), the valve F (12), the valve G (14), the manifold (15) and the pressure gauge I (16) are located inside the incubator (42).
6. The experimental device for monitoring interphase dynamic diffusion of a fracture-cavity oil reservoir gas injection tracer according to claim 5, wherein the oil-gas separator (36) is connected with the back pressure valve III (39) through a pipeline; the oil-gas separator (36) is provided with a valve L (35) on a pipeline connected with the back pressure valve III (39), and the oil-gas separator (36), the liquid level sensor (34) and the valve L (35) are positioned in the incubator (42).
7. The experimental device for monitoring interphase dynamic diffusion of a fracture-cavity oil reservoir gas injection tracer according to claim 6, wherein the crude oil mixing analysis system comprises a valve M (37), a vacuum bottle (38) and a gas meter II (33), wherein the vacuum bottle (38) is connected with the gas meter II (33) through a pipeline, the vacuum bottle (38) is intersected with a pipeline connected with a back pressure valve III (39) through a pipeline, and the valve M (37) is arranged on a pipeline connected with the back pressure valve III (39) between the pipeline connected with the oil-gas separator (36) and the back pressure valve III (39); the valve M (37) is located inside the incubator (42).
8. A method of using the experimental device for monitoring interphase dynamic diffusion of a gas injection tracer for a fracture-cavity reservoir as set forth in claim 7, characterized by firstly constructing a formation fluid system, adjusting a thermostat (42) to a proper temperature, injecting formation water into the fracture-cavity reservoir etching model (41) by using the water injection system, sequentially injecting dead oil and living oil into the fracture-cavity reservoir etching model (41) by using the oil injection system, stopping the oil injection system when the ratio of crude oil gas oil to water flowing out into a vacuum bottle (38) to underground living oil to gas oil is the same, completing the construction of the formation fluid system, wherein the dead oil and the living oil are the same experimental oil, the dead oil is the experimental oil which is not movable in a displacement experiment, and the living oil is the experimental oil which is movable in the displacement experiment;
using the gas injection system to displace the oil-water mixture in the fracture-cavity reservoir etching model (41) by using the mixed gas of the tracer and N 2, wherein the tracer is octafluorocyclobutane, the mixed gas displaces the oil-water mixture in the fracture-cavity reservoir etching model (41) to form an oil-gas mixed fluid, and the oil-gas mixed fluid flows out of the outlet end of the fracture-cavity reservoir etching model (41) and enters the oil-gas separation system, and the oil-gas separation system separates the oil-gas mixed fluid into gas phase fluid and oil phase fluid;
the gas phase enters the tracer collector I (21) from the outlet at the upper end of the oil-gas separator (36) through a throttle valve (29), gas phase samples at different times are collected by the tracer collector I (21), the concentration of the tracer in the gas phase samples is analyzed by the tracer analyzer (22), and a change curve of the concentration of the tracer with time is output by the computer (23) connected with the tracer analyzer (22), so that a corresponding tracer response curve in the gas phase is obtained;
After the oil phase fluid flows out of the lower part of the oil-gas separator (36), the oil phase fluid flows into the triangular flask (26) through a pipeline and is degassed, the quantity of crude oil in the oil phase fluid can be calculated by measuring the front-back mass change of the triangular flask (26), the quality of the removed gas is measured through the gas meter I (25), meanwhile, the removed gas enters the tracer collector II (24), the tracer collector II (24) is used for collecting gas samples removed at different moments, the tracer concentration in the collected gas samples is analyzed through the tracer analyzer (22), and finally the dissolution and diffusion proportion of the tracer in the crude oil is converted.
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