CN112780263A - Experimental device for monitoring interphase dynamic diffusion of gas injection tracer of fracture-cavity oil reservoir and using method of experimental device - Google Patents
Experimental device for monitoring interphase dynamic diffusion of gas injection tracer of fracture-cavity oil reservoir and using method of experimental device Download PDFInfo
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- 239000000700 radioactive tracer Substances 0.000 title claims abstract description 108
- 238000002347 injection Methods 0.000 title claims abstract description 83
- 239000007924 injection Substances 0.000 title claims abstract description 83
- 238000009792 diffusion process Methods 0.000 title claims abstract description 29
- 238000012544 monitoring process Methods 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 21
- 230000016507 interphase Effects 0.000 title claims abstract description 19
- 239000012530 fluid Substances 0.000 claims abstract description 49
- 239000010779 crude oil Substances 0.000 claims abstract description 28
- 238000004088 simulation Methods 0.000 claims abstract description 27
- 238000004458 analytical method Methods 0.000 claims abstract description 21
- 238000000926 separation method Methods 0.000 claims abstract description 20
- 238000002156 mixing Methods 0.000 claims abstract description 10
- 238000004090 dissolution Methods 0.000 claims abstract description 6
- 239000003921 oil Substances 0.000 claims description 85
- 235000019198 oils Nutrition 0.000 claims description 78
- 238000005530 etching Methods 0.000 claims description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 19
- 239000007788 liquid Substances 0.000 claims description 18
- 239000003795 chemical substances by application Substances 0.000 claims description 10
- 239000008398 formation water Substances 0.000 claims description 7
- 230000033228 biological regulation Effects 0.000 claims description 6
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims description 5
- 238000002474 experimental method Methods 0.000 claims description 5
- 235000019476 oil-water mixture Nutrition 0.000 claims description 5
- 230000004044 response Effects 0.000 claims description 5
- 230000015572 biosynthetic process Effects 0.000 claims description 4
- 230000008859 change Effects 0.000 claims description 4
- 238000006073 displacement reaction Methods 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 239000004341 Octafluorocyclobutane Substances 0.000 claims description 2
- BCCOBQSFUDVTJQ-UHFFFAOYSA-N octafluorocyclobutane Chemical group FC1(F)C(F)(F)C(F)(F)C1(F)F BCCOBQSFUDVTJQ-UHFFFAOYSA-N 0.000 claims description 2
- 235000019407 octafluorocyclobutane Nutrition 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 7
- 206010017076 Fracture Diseases 0.000 description 69
- 208000010392 Bone Fractures Diseases 0.000 description 68
- 238000009826 distribution Methods 0.000 description 9
- 238000011161 development Methods 0.000 description 8
- 238000012360 testing method Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 239000003208 petroleum Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005094 computer simulation Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
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- 230000007246 mechanism Effects 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
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- 239000011148 porous material Substances 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000012612 static experiment Methods 0.000 description 1
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- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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Abstract
The invention aims to provide an experimental device for monitoring interphase dynamic diffusion of a gas injection tracer in a fracture-cavity reservoir and a using method thereof, which can simulate the seepage process of the gas injection tracer in an oil-gas two-phase fracture-cavity reservoir and dynamically monitor the dissolution diffusion of the gas tracer in crude oil under the conditions of high temperature and high pressure; 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 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.
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 using method thereof.
Background
The carbonate reservoir oil-gas resource occupies an important position in global oil resources, and occupies more than half of the global total oil-gas resource; the fracture-cavity carbonate rock reservoir has strong heterogeneity, various reservoir spaces and complex reservoir body types; due to the development of large-scale cracks and caverns, the storage and seepage mode and the flow mechanism of the porous material 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 enclosed space. During the development of fracture-cavity reservoirs, after a certain period of production, the oil well often fails to produce because of insufficient energy. For production wells in a well group in the same fracture-cave unit, a well group water injection and gas injection method is often adopted to improve the formation energy, so that higher and stable recovery ratio is obtained. Therefore, the evaluation of the communication among the wells of the same fracture-cavity unit well group, the knowledge of the underground fracture-cavity distribution and the residual oil distribution of the block play a key role in the arrangement of the field water injection well pattern and the setting of parameters.
The tracer testing technology can more accurately evaluate the swept condition of the fluid and recognize the information of the flow direction and the flow speed of the injected fluid. The development condition of the fracture and the distribution of the residual oil in the block are determined, and the method plays an active guiding role in further knowing the heterogeneity characteristics of the fracture-cavity type oil reservoir and the connection relation and distribution of stratum fractures and cavities. At present, a few studies on the aspect of monitoring the gas tracer agent exist in China, the gas tracer agent is injected into an injection well, the response of the tracer agent is sampled and monitored in a production well, so that a response curve of the gas tracer agent is drawn, and finally, stratum characteristic parameters are obtained by fitting and reflecting theoretical curves and actual measurement curves.
According to the phase state theory and the diffusion theory, the gas tracer is continuously dissolved and diffused to crude oil in the flowing process, so that the retention loss of the tracer is caused, and the tracer has different types, different stratum conditions and different dissolving and diffusing amounts. If the dissolution and diffusion factors of the gas tracer in the oil water are not considered, a large error can be caused to the interpretation result of the on-site tracer monitoring. At present, experimental devices for testing the dissolution and diffusion of a gas tracer to oil and water in a stratum are all based on static experiments, but the actual field condition is that each phase of oil gas water and the gas tracer is in a dynamic process, so that a dynamic simulation test needs to be carried out.
CN106837317A discloses a tight reservoir oil filling simulation method and system, and the method comprises: obtaining a first sample corresponding to a tight reservoir and a second sample corresponding to a target source rock; preprocessing the first sample, and performing overburden pressure physical property measurement and formation water injection to obtain first data; carrying out total organic carbon, pyrolysis and maturity determination on the second sample, and carrying out hydrocarbon generation dynamics test of an open system on the second sample with the maturity lower than a preset value to obtain second data; determining a source storage and preparation relation of the tight reservoir according to the logging information, the first information and the second information, filling a first sample and a second sample according to the relation, and obtaining a simulation sample; according to the stratum burying history and the heat history, the temperature and the pressure of the stratum at present, petroleum distribution is measured after geological process constraint simulation experiments are carried out 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 reservoir and the use method thereof are provided in the field of oil-gas field development technology simulation in a targeted manner, and the technical problem to be solved is urgent.
Disclosure of Invention
The invention aims to provide an experimental device for monitoring interphase dynamic diffusion of a gas injection tracer in a fracture-cavity reservoir and a using method thereof, which can simulate the seepage process of the gas injection tracer in an oil-gas two-phase fracture-cavity reservoir and dynamically monitor the dissolving diffusion amount of the gas tracer in crude oil under the conditions of high temperature and high pressure.
In order to achieve the aim, the solution of the invention is to provide an experimental device for monitoring the interphase dynamic diffusion of the gas injection tracer of the fracture-cavity 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-cave reservoir simulation system is used for simulating the environment of a fracture-cave carbonate reservoir;
the multiphase fluid injection system is used for injecting gas, crude oil and a tracer into the fracture-cave reservoir simulation system;
the oil-gas separation system is used for separating oil-gas mixed fluid flowing out of 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 crude oil component proportion in the fracture-cave reservoir simulation system;
the metering and analyzing system is used for analyzing the concentration of the tracer in the oil phase fluid and the gas phase after the separation of the oil-gas separation system.
Further, slot hole reservoir simulation system includes slot hole reservoir sculpture model, manometer II, backpressure pump I, backpressure valve III, valve H and thermostated container, backpressure pump I slot hole reservoir sculpture model with manometer II is located in the thermostated container, backpressure valve III pass through the pipeline with slot hole reservoir sculpture model exit end is connected, backpressure pump I pass through the pipeline with backpressure valve III connects, manometer II is located slot hole reservoir sculpture model with on the pipeline that backpressure valve III connects, connect backpressure pump I with be equipped with valve H on the pipeline of backpressure valve III.
Further, the multiphase fluid injection system comprises a gas injection system, an oil injection system, a water injection system, a pressure regulation system, a pressure gauge I and a manifold, wherein the gas injection system, the oil injection system, the water injection system and the pressure regulation system are converged at the inlet end of the manifold through pipelines, the pressure gauge I is positioned on the manifold, and the outlet end of the manifold is connected with the inlet end of the slit-cavity 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 a pipeline;
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 collecting pipe are sequentially connected through a pipeline.
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 positioned 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 liquid level sensor is arranged on the oil-gas separator, the liquid level sensor is connected with the oil-gas separator through an electric line, 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 pipeline connecting the oil-gas separator and the back pressure valve III is provided with a valve L, and a pipeline connecting the back pressure valve II and the back pressure pump II is provided with a valve I; the oil-gas separator, the liquid level sensor and the valve L are positioned inside the incubator.
Further, the crude oil mixing analysis system comprises a valve M, a vacuum bottle and a gas meter II, 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 located inside the incubator.
Further, measurement and analysis system includes choke valve, spike agent collector I, spike agent collector II, spike agent analysis appearance, computer, valve K, valve J, triangular flask and gas meter I, back pressure valve II valve K the choke valve tracer collector I the spike agent analysis appearance with the computer passes through the pipeline and connects gradually, back pressure valve I valve J triangular flask I with gas meter I connects gradually through the pipeline, the spike agent analysis appearance tracer collector II with connect gradually through the pipeline between the triangular flask I.
The invention also provides a use method of the experimental device for monitoring the gas injection tracer interphase dynamic diffusion of the fracture-cave reservoir, which comprises the steps of firstly constructing a stratum fluid system, adjusting the thermostat to a proper temperature, injecting stratum water into the fracture-cave reservoir etching model by using the water injection system, sequentially injecting dead oil and live oil into the fracture-cave reservoir etching model by using the oil injection system, stopping the oil injection system when the gas-oil-water ratio of crude oil flowing out of a vacuum bottle is the same as the gas-oil ratio of underground live oil, and completing the construction of the stratum fluid system, wherein the dead oil and the live oil are the same experimental oil, the dead oil is immovable experimental oil in a displacement experiment, and the live oil is movable experimental oil in the displacement experiment;
using the gas injection system to inject tracer and N2The tracer is octafluorocyclobutane, the injected gas displaces the oil-water mixture in the fracture-cavity reservoir etching model to form 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 an outlet at the upper end of the oil-gas separator through a throttle valve, gas phase samples at different moments are collected by the tracer collector I, the concentration of the tracer in the gas phase samples is analyzed by the tracer analyzer, and a time-varying curve of the concentration of the tracer is output by the computer connected with the tracer analyzer, so that a corresponding tracer response curve in the gas phase is obtained;
and after the oil phase fluid flows out from the lower part of the oil-gas separator, the oil phase fluid flows into the triangular flask through a pipeline and is degassed, the amount of crude oil in the oil phase fluid can be calculated by measuring the mass change of the triangular flask in front and back, the desorbed gas mass is measured by the gas meter I, the desorbed gas enters the tracer collector II at the same time, the tracer collector II is used for collecting gas samples desorbed at different moments, the tracer concentration in the extracted gas samples is analyzed by the tracer analyzer, and finally the dissolution diffusion ratio of the tracer in the crude oil is calculated.
The invention has the following advantages:
1. the actual reservoir fracture hole is simulated through the fracture-hole reservoir etching model, the flowing process of multiple fluids in the fracture hole can be accurately simulated, and the actual guiding function is provided for the actual development and research of the fracture-hole type oil reservoir;
2. the fracture-cavity reservoir etching model can be made into different shapes 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 types of gas tracers, so that the fracture-cavity reservoir etching model has wide applicability.
Drawings
FIG. 1 is a schematic diagram of an experimental apparatus for monitoring interphase dynamic diffusion of a gas injection tracer in a fracture-cavity reservoir, provided by the invention;
in the figure, 1-a gas injection pump, 2-a valve A, 3-an intermediate container I, 4-a valve B, 5-a valve C, 6-an intermediate container II, 7-a valve D, 8-a constant pressure constant speed pump I, 9-a constant pressure constant speed pump II, 10-a valve E, 11-an intermediate container III, 12-a valve F, 13-a vacuum pump, 14-a valve G, 15-a manifold, 16-a pressure gauge I, 17-a back pressure pump I, 18-a valve H, 19-a back pressure pump II, 20-a valve I, 21-a tracer collector I, 22-a tracer analyzer, 23-a computer, 24-a tracer collector II, 25-a gas meter I, 26-a triangular bottle, 27-a valve J, 28-a back pressure valve I, 29-a throttle valve, 30-back pressure valves II, 31-valves K, 32-automatic electric control valves, 33-gas meters II, 34-liquid level sensors, 35-valves L, 36-oil-gas separators, 37-valves M, 38-vacuum bottles, 39-back pressure valves III, 40-pressure meters II, 41-fracture-cavity reservoir etching models and 42-thermostats.
Examples
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention.
Example 1
As shown in figure 1, the experimental device for monitoring the gas injection tracer interphase dynamic diffusion of the fracture-cavity 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-cave reservoir simulation system is used for simulating the environment of a fracture-cave carbonate reservoir; the multiphase fluid injection system is used for injecting gas, crude oil and a tracer into the fracture-cave reservoir simulation system; the oil-gas separation system is used for separating oil-gas mixed fluid flowing out of 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 crude oil component proportion in the fracture-cave reservoir simulation system; the metering and analyzing system is used for analyzing the concentration of the tracer in the oil phase fluid and the gas phase after the separation of the oil-gas separation system.
Example 2
Fracture hole reservoir simulation system includes fracture hole reservoir sculpture model 41, manometer II40, backpressure pump I17, back pressure valve III39, valve H18 and thermostated container 42, backpressure pump I17 fracture hole reservoir sculpture model 41 with manometer II40 is located in the thermostated container 42, backpressure valve III39 pass through the pipeline with fracture hole reservoir sculpture model 41 exit end is connected, backpressure pump I17 pass through the pipeline with back pressure valve III39 is connected, manometer II40 is located fracture hole reservoir sculpture model 41 with on the pipeline that back pressure valve III39 connects, connect back pressure pump I17 with be equipped with valve H18 on the pipeline of 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 regulation system, a pressure gauge I16 and a manifold 15, wherein the gas injection system, the oil injection system, the water injection system and the pressure regulation system are connected with the inlet end of the manifold 15 through pipelines, the pressure gauge I16 is positioned on the manifold 15, and the outlet end of the manifold 15 is connected with the inlet end of the fracture-cave reservoir layer 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 collecting pipe 15 are sequentially connected through a pipeline; 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 a pipeline; 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 a pipeline; the pressure regulating system comprises a vacuum pump 13 and a valve G14, wherein the vacuum pump 13, the valve G14 and the header 15 are connected in sequence through pipelines.
The intermediate vessel I3, the valve B4, the intermediate vessel II6, the valve C5, the intermediate vessel 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 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 line, 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 pipeline connecting the oil-gas separator 36 and the back-pressure valve III39 is provided with a valve L35, and a pipeline connecting the back-pressure valve II30 and the back-pressure pump II19 is provided with a valve I20; the air-oil separator 36, the 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 between 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 oven 42.
Metering and analyzing system includes choke valve 29, tracer collector I21, tracer collector II24, tracer analysis appearance 22, computer 23, valve K31, valve J27, triangular flask 26 and gas appearance I25, back pressure valve II30 valve K31 the choke valve 29 tracer collector I21 tracer analysis appearance 22 with computer 23 connects gradually through the pipeline, back pressure valve I28 valve J27 the triangular flask 26 with gas appearance I25 connects gradually through the pipeline, tracer analysis appearance 22 tracer collector II24 with connect gradually through the pipeline between the triangular flask 26.
Example 3
The invention further provides an experimental step embodiment of a using method of the experimental device for monitoring the interphase dynamic diffusion of the gas injection tracer of the fracture-cavity oil reservoir:
s1, cleaning a pipeline;
s2, the vacuum pump 13 evacuates the intermediate vessel I3, the intermediate vessel II6 and the intermediate vessel III11 to vacuum, and then all valves are closed;
s3, reservoir fluid sample preparation experiment step under stratum conditions, including:
s31, adjusting the temperature of the constant temperature box 42 to the required simulated formation temperature and keeping the temperature stable;
s32, opening the valve D7, injecting the formation water into the intermediate container II6, stopping injecting after the pressure in the intermediate container II6 is stabilized, 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 formation water in the intermediate container II6 by the constant-pressure constant-speed pump I8, enabling the formation water to enter the fracture-cave reservoir etching model 41, and enabling the formation water to flow into the vacuum bottle 38 after the formation water saturates the fracture-cave reservoir etching model 41 after a period of time;
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 the dead oil in the intermediate container III11 by the constant-pressure constant-speed pump II9, enabling the dead oil to enter the fracture-cave reservoir etching model 41, enabling the dead oil to saturate the fracture-cave reservoir etching model 41 after a period of time and then flow into the vacuum bottle 38, and when the dead oil flowing into the vacuum bottle 38 is completely anhydrous, closing the constant-pressure constant-speed pump II9 and closing the valve F12;
s36, injecting the live oil under the stratum condition into the intermediate container III11, stopping injecting the live oil after the pressure in the intermediate container III11 is stable, and closing the valve E10;
s37, opening a valve F12, setting the pressure of the constant-pressure constant-speed pump II9, opening a valve E10, slowly displacing the live oil in the intermediate container III11 by the constant-pressure constant-speed pump II9, enabling the live oil to enter the fracture-cave reservoir etching model 41, enabling the live oil to flow into the vacuum bottle 38 after the fracture-cave reservoir etching model 41 is saturated by the live oil after a period of time, closing the constant-pressure constant-speed pump II9 and the back-pressure pump I17 when the gas-oil ratio of crude oil gas oil flowing out of the vacuum bottle 38 to underground live oil gas oil is the same, closing the valve E10, the valve F12 and the valve M37, and completing the step of establishing a 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, and continuously injecting N2, N2 and the tracer slug in the intermediate container I3 into the intermediate container I3 through the gas injection pump 1 to displace the oil-water mixture in the fracture-cavity reservoir etching model 41;
s6, displacing the oil-water mixture in the fracture-cavity reservoir etching model 41 with the injected gas to form 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 a gas phase to enter the tracer collector I21 from the outlet at the upper end of the oil-gas separator 36 through a throttle valve 29, collecting gas phase samples at different moments by using the tracer collector I21, analyzing the concentration of the tracer in the gas phase samples by using the tracer analyzer 22, and outputting a tracer concentration change curve along with time by using the computer 23 connected with the tracer analyzer 22 to obtain a corresponding tracer response curve in the gas phase;
s7, after the oil phase fluid flows out from the lower part of the oil-gas separator 36, because the liquid level sensor 34 is installed 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 quantity of crude oil in the oil phase fluid can be calculated by measuring the mass change of the triangular flask 26 before and after, the desorbed gas mass is measured through the gas measuring instrument I25, meanwhile, the desorbed gas enters the tracer collector II24, the tracer collector II24 is used for collecting gas samples desorbed at different moments, the tracer analyzer 22 is used for analyzing the concentration of the tracer in the collected gas samples, and finally, the dissolution diffusion ratio 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 distribution and shape of the fracture and cavity of the reservoir, and the method can accurately simulate the flowing process of multiphase fluid in the fracture and cavity reservoir and has direct guiding significance for the development and research of fracture and cavity oil 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 position of the liquid level, so that the gas phase in the oil-gas separator 36 is accurately controlled not to flow out from the oil phase outlet at the bottom end;
3. the produced gas flows into a tracer collector I21 from the upper end of the oil-gas separator 36 through a back pressure valve II30, and the concentration of the tracer in the gas phase can be monitored in real time through a tracer analyzer 22;
4. the produced liquid flows into a triangular flask 26 through an automatic electric control valve 32 at the lower end outlet of the oil-gas separator 36 to be degassed and separated at normal temperature and normal pressure, and the dissolving and diffusing amount proportion of gas in crude oil can be measured by detecting a tracer in the desorbed gas;
5. the fracture-cavity reservoir etching model 41 can be made into different shapes and sizes according to the actual fracture-cavity reservoir characteristics, can meet reservoir simulation of different fracture-cavity distribution, and can be replaced according to the types of gas tracers, so that the fracture-cavity reservoir etching model has wide applicability.
It is obvious that the described embodiments are a part of the present invention, not all embodiments, and all other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without any inventive work belong to the protection scope of the present invention.
Claims (9)
1. An experimental device for monitoring interphase dynamic diffusion of a gas injection tracer of a fracture-cavity 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-cave reservoir simulation system is used for simulating the environment of a fracture-cave carbonate reservoir;
the multiphase fluid injection system is used for injecting gas, crude oil and a tracer into the fracture-cave reservoir simulation system;
the oil-gas separation system is used for separating oil-gas mixed fluid flowing out of 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 crude oil component proportion in the fracture-cave reservoir simulation system;
the metering and analyzing system is used for analyzing the concentration of the tracer in the oil phase fluid and the gas phase after the separation of the oil-gas separation system.
2. The experimental device for monitoring interphase dynamic diffusion of gas injection tracer in a fracture-cavity reservoir according to claim 1, it is characterized in that the fracture-cave reservoir simulation system comprises a fracture-cave 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 back pressure pump I (17), the slot hole reservoir etching model (41) and the pressure gauge II (40) are positioned in the constant temperature box (42), the back pressure valve III (39) is connected with the outlet end of the slot 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, the pressure gauge II (40) is located on a pipeline connected with the fracture-cavity reservoir etching model (41) and the back-pressure valve III (39), and a valve H (18) is arranged on a pipeline connected with the back-pressure pump I (17) and the back-pressure valve III (39).
3. The experimental device for monitoring the interphase dynamic diffusion of the gas injection tracer in the fracture-cavity reservoir as claimed in any one of claims 1 or 2, wherein the multiphase fluid injection system comprises a gas injection system, an oil injection system, a water injection system and a pressure regulation system, a pressure gauge I (16) and a manifold (15), the gas injection system, the oil injection system, the water injection system and the pressure regulation system are connected at an inlet end of the manifold (15) through pipelines, the pressure gauge I (16) is positioned on the manifold (15), and an outlet end of the manifold (15) is connected with an inlet end of the fracture-cavity reservoir etching model (41).
4. The experimental device for monitoring interphase dynamic diffusion of gas injection tracer for a fracture-cavity reservoir according to any one of claims 1 to 3,
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), wherein the vacuum pump (13), the valve G (14) and the collecting pipe (15) are sequentially connected through a pipeline.
5. An experimental apparatus for monitoring the gas injection tracer phase-to-phase dynamic diffusion of a fracture-cavity reservoir according to any one of claims 1 to 4, characterized in that 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 the interphase dynamic diffusion of the gas injection tracer for the fracture-cavity reservoir according to any one of claims 1 to 3, wherein 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 line, 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 the oil-gas separator (36) is connected with the back-pressure valve III (39) through a pipeline; a pipeline connecting the oil-gas separator (36) and the back-pressure valve III (39) is provided with a valve L (35), and a pipeline connecting the back-pressure valve II (30) and the back-pressure pump II (19) is provided with a valve I (20); the gas-oil separator (36), the liquid level sensor (34) and the valve L (35) are located inside the incubator (42).
7. The experimental device for monitoring the interphase dynamic diffusion of the gas injection tracer for the fracture-cavern reservoir as claimed in any one of claims 1 to 3, wherein the crude oil mixing analysis system comprises a valve M (37), a vacuum bottle (38) and a gas meter II (33), the vacuum bottle (38) is connected with the gas meter II (33) through a pipeline, the vacuum bottle (38) is connected with the pipeline connected between the oil-gas separator (36) and the back-pressure valve III (39) through a pipeline, and the valve M (37) is disposed on the pipeline; the valve M (37) is located inside the oven (42).
8. The experimental device for monitoring gas injection tracer phase-to-phase dynamic diffusion of a fracture-cavity oil reservoir according to any one of claims 1 to 6, wherein the metering and analyzing 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), 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 agent collector II (24) and the triangular flask (26) are sequentially connected through a pipeline.
9. The use method of the experimental device for monitoring the gas injection tracer interphase dynamic diffusion of the fracture-cave reservoir is characterized in that a formation fluid system is firstly constructed, a thermostat (42) is adjusted to a proper temperature, formation water is injected into the fracture-cave reservoir etching model (41) by using the water injection system, dead oil and live oil are sequentially injected into the fracture-cave reservoir etching model (41) by using the oil injection system, the oil injection system is stopped when the oil-gas-oil ratio and the underground live oil-gas-oil ratio which flow out of a vacuum bottle (38) are the same, the dead oil and the live oil are the same experimental oil, the dead oil is immovable experimental oil in a displacement experiment, and the live oil is movable experimental oil in the displacement experiment;
using the gas injection system to inject tracer and N2The mixed gas replaces an oil-water mixture in the fracture-cavity reservoir etching model (41), the tracer is octafluorocyclobutane, the injected gas replaces the oil-water mixture in the fracture-cavity reservoir etching model (41) to form an oil-gas mixed fluid, the oil-gas mixed fluid flows out of an outlet end of the fracture-cavity reservoir etching model (41) and enters an 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 an outlet at the upper end of the oil-gas separator (36) through a throttle valve (29), gas phase samples at different moments 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 computer (23) connected with the tracer analyzer (22) outputs a tracer concentration time-varying curve to obtain a corresponding tracer response curve in the gas phase;
after the oil phase fluid flows out of the lower portion of the oil-gas separator (36), 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 mass change of the triangular flask (26) in the front and back direction, the mass of desorbed gas is measured by the gas meter I (25), the desorbed gas enters the tracer collector II (24), the tracer collector II (24) is used for collecting gas samples desorbed at different moments, the tracer analyzer (22) is used for analyzing the concentration of the tracer in the extracted gas samples, and finally the dissolution diffusion ratio of the tracer in the crude oil is calculated.
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