CN115596415A - Three-dimensional physical simulation experiment method for viscosity reduction and flooding common heavy oil reservoir - Google Patents
Three-dimensional physical simulation experiment method for viscosity reduction and flooding common heavy oil reservoir Download PDFInfo
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- E—FIXED CONSTRUCTIONS
- 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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
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- E—FIXED CONSTRUCTIONS
- 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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/30—Specific pattern of wells, e.g. optimising the spacing of wells
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- E—FIXED CONSTRUCTIONS
- 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 provides a three-dimensional physical simulation experiment method for a viscosity-reducing flooding common heavy oil reservoir, which comprises the following steps: sampling a reservoir core, and analyzing physical property parameters; mixing the natural river sand with different meshes according to the proportion, and mixing the epoxy resin; carrying out numerical control engraving on the cube-shaped cementing model formed by pressing to form an equal-proportion oil reservoir model; coating high-temperature sealant on the oil reservoir model with the equal proportion; modeling a 3D printing pressure maintaining cabin; filling the 3D aluminum pressure maintaining cabin with half cabin high-temperature sealant, and placing the sealed three-dimensional equal-proportion oil reservoir model into the 3D aluminum pressure maintaining cabin; calculating regular well patterns and well distances and irregular well patterns and well distances in the three-dimensional equal-proportion oil reservoir model; and predicting the recovery ratio of the actual oil reservoir. The three-dimensional physical simulation experiment method for the viscosity-reducing flooding common heavy oil reservoir simulates a regular well pattern and an irregular well pattern according to the actual arrangement condition of the well pattern of the oil reservoir, detects the production conditions of liquid production, oil production and the like of different single wells, and predicts the recovery ratio of the actual oil reservoir.
Description
Technical Field
The invention relates to the technical field of thickened oil chemical flooding, in particular to a three-dimensional physical simulation experiment method for a viscosity reduction flooding common thickened oil reservoir.
Background
The water-flooding common thickened oil reserves of the victory oil field are rich. But the development and oil recovery speed of the water-flooding heavy oil reservoir is low, the recovery ratio is low, and the economic benefit is very low. In order to greatly improve the recovery ratio of common water-flooding thickened oil, an oil displacement system (a foaming agent and a viscosity-reducing oil displacement agent) is added into injected water to carry out chemical viscosity-reducing oil displacement. And a better oil displacement effect is obtained in the application of the mine field. In 2020, 9 blocks of 35 well groups are implemented cumulatively, and the cumulative oil increase is 20000 tons.
Although the novel emulsion oil displacement agent achieves a better oil increasing effect on site, simulation means is lacked for analyzing the oil displacement effect under different oil reservoir conditions. It is not clear for the crude oil displaced by the novel emulsified oil displacement agent that part of the crude oil is.
In the application No.: chinese patent application CN201510628714.1 relates to a bottom water reservoir water body energy three-dimensional physical simulation device and method, the bottom water reservoir water body energy three-dimensional physical simulation device comprises a model body, a water body intermediate container, a gas intermediate container, a displacement pump, a high-pressure gas cylinder, a first six-way valve and a second six-way valve; the displacement pump, the high-pressure gas cylinder, the top end of the water body intermediate container and the top end and the bottom end of the gas intermediate container are respectively connected with one valve of the first six-way valve; the bottom end of the water body intermediate container is connected to the bottom of the model body through a second six-way valve; the displacement pump is used for pumping the external water body into the water body intermediate container through the first six-way valve; the high-pressure gas cylinder is used for injecting external gas into the gas intermediate container through the first six-way valve; and the model body is used for accommodating the bottom water oil layer so as to simulate the bottom water oil reservoir.
In the application No.: CN 201110299179.1's Chinese patent application relates to a three-dimensional physical simulation system of viscous crude horizontal well steam-drive, steam, chemical agent, gas and saturated oil are injected into to this model body to the injection system, observe and control the system and set up this injection system and output system and carry out data acquisition to each temperature measurement pressure measurement point inside the model body, output system accomplishes well opening, well closing and level pressure production, have experimental oil reservoir, pressure sensor, differential pressure sensor and thermocouple in this model body to carry out the analogue test of experimental oil reservoir.
In application No.: CN201510177046.5, the present application relates to a multifunctional thermal recovery three-dimensional physical simulation reservoir pressure system, which comprises a model body, a pressure sensor, a computer, an adjustment controller and an electromagnetic valve, wherein the pressure sensor is connected to the model body, monitors the pressure change of the simulated reservoir pressure in the model body, and transmits the collected pressure value to the adjustment controller, the adjustment controller is connected to the model body, the electromagnetic valve and the computer, and transmits the collected pressure value to the computer, the computer controls the switch of the electromagnetic valve according to the collected pressure value, the electromagnetic valve is connected to a production well in the model body, and the electromagnetic valve is a control switch of a production system of the production well.
In the application No.: CN201720245924.7 relates to a three-dimensional physical simulation experiment device for microbial oil displacement, which comprises a pretreatment module, a fluid module, a model body assembly, a produced liquid metering module, a computer measurement and control module, a power supply module and an experiment auxiliary module, wherein the model body assembly comprises a piston pressing plate, a main piston, a pressing piston, a high-pressure cavity and a lower pressing plate, and the main piston is fixedly connected with the piston pressing plate. Has the advantages that: the technical scheme is that gas, water, oil and sand are input into a model body assembly; and providing a high voltage; a constant temperature is provided by an oven.
In the application No.: in the Chinese patent application CN201310062915.0, the invention relates to a three-dimensional physical simulation experimental device, wherein a plurality of layers of rock cores are arranged in a model main body; the contact surface between the interior of the model main body and the sand is subjected to special roughening treatment, and the model cover plate and the outer side of the model main body support are fixed through the upper pressing plate, so that the sand for simulating the stratum is actually in an extrusion state, and a good sealing type is provided; sufficient saturation points and pressure measuring points are uniformly distributed on the bottom plate of the model, and the saturation points and the like can be exchanged randomly through different joint modes, so that the saturation and pressure field in the model can be effectively monitored in the test process, and the operating parameters of the system can meet the test requirements; the problems that the existing three-dimensional model is too low in working pressure, does not have an upper pressure system, is poor in sealing performance and does not have saturation points and pressure measuring points in the model are solved.
In the application No.: CN201320022913.4, which is incorporated herein by reference, relates to a high pressure resistant three-dimensional physical simulation gas reservoir development experimental apparatus, wherein a cylinder body of the high pressure resistant three-dimensional physical simulation gas reservoir development experimental apparatus is designed as a cylinder, so as to avoid stress concentration, improve the high pressure resistance of the experimental apparatus, and enlarge the application range of the experimental apparatus. The high-pressure-resistant three-dimensional physical simulation gas reservoir development experimental device can be used for carrying out experimental research on the aspects such as water invasion characteristics of a marginal water fracture gas reservoir, optimization of a low-permeability compact gas reservoir well pattern, development rules of a condensate gas reservoir and the like.
The prior art relates to simulation of the development mode of the thickened oil applied to the oil field, and is mainly used for simulating different development modes by using different processes. The simulation of the oil reservoir physical property characteristics adopts filling loose quartz sand. The method can not reflect the real physical property conditions of the viscosity-reducing and flooding heavy oil reservoir, and can not realize the similarity of the reservoir in all directions from a three-dimensional angle. Is not suitable for the three-dimensional physical simulation of the viscosity-reducing flooding common heavy oil reservoir. The method is greatly different from the method, the technical problem which is required to be solved cannot be solved, and therefore a novel three-dimensional physical simulation experiment method for the viscosity-reducing and flooding common heavy oil reservoir is invented.
Disclosure of Invention
The invention aims to provide a method for simulating the physical property characteristics of a viscosity-reducing flooding common heavy oil reservoir and achieving the omnibearing geometric similarity of the oil reservoir; simulating the production process of the heavy oil under different oil reservoir conditions; the three-dimensional physical simulation experiment method for the viscosity reduction flooding common heavy oil reservoir determines the crude oil utilization area and the production conditions of different well patterns.
The object of the invention can be achieved by the following technical measures: the three-dimensional physical simulation experiment method for the viscosity reduction flooding common heavy oil reservoir comprises the following steps:
and 8, detecting the production condition, synchronously detecting the saturation changes of different well distances and different longitudinal depths of the plane, and predicting the recovery ratio of the actual oil reservoir.
The object of the invention can also be achieved by the following technical measures:
in step 1, sampling a reservoir core, and analyzing the physical parameters such as porosity, permeability and particle size; determining the mass ratio of different particle sizes of the natural river sand according to the physical analysis data of the rock core; the proportion of the natural river sand with different meshes ensures that the rounding degree of the model particles is closer to that of the reservoir rock particles.
In step 1, comparing and analyzing the pore structure characteristics of the artificial cementing model and the reservoir rock core according to the pore structure characteristics obtained by the mercury intrusion experiment, determining the model pressing pressure and the pressing time, and ensuring the similarity of the pore structure characteristics of the artificial cementing model and the reservoir rock core.
And 2, pressing the cementing model into a wet model in a cubic shape according to the pressing pressure and time determined in the step 1, and firing, curing and molding the wet model at the high temperature of 750 ℃.
In step 3, according to the three-dimensional size and the similar theory of the oil reservoir geological model, the cubic cementation model formed by pressing is subjected to numerical control engraving to form an equal proportion oil reservoir model; and each angle of the equal-proportion oil reservoir model simulates the irregular shape of the oil reservoir in equal proportion, so that the geometrical shapes of the oil reservoirs are completely similar.
In step 5, modeling a 3D printing pressure maintaining cabin according to the size of the three-dimensional cemented artificial stereoscopic equal-proportion oil reservoir model; and printing the aluminum material three-dimensional cementing model pressure-maintaining cabin by using a 3D printer.
In step 5, when printing the pressure maintaining cabin of the cementation three-dimensional model, the shape of the pressure maintaining cabin can be changed according to the change of the simulated oil reservoir shape; the 3D aluminum pressure maintaining cabin realizes comprehensive coincidence of all angles of the cementing model; meanwhile, the aluminum material has high hardness, so that pressure maintaining and bearing of the three-dimensional equal-proportion reservoir model can be realized; the maximum withstand voltage was 5MPa.
Filling half of the 3D aluminum pressure maintaining cabin with high-temperature sealant, and placing the sealed three-dimensional equal-proportion oil reservoir model into the 3D aluminum pressure maintaining cabin; putting the two into a vacuum drier, vacuumizing, and completely pumping air in the high-temperature sealant; the sealing strength of the high-temperature sealant is ensured; and after the high-temperature sealant is solidified, forming a three-dimensional equal-proportion oil reservoir model with a pressure cabin.
And 8, detecting the production conditions of liquid production, oil production and pressure of different single wells, synchronously detecting the saturation changes of different well distances and different longitudinal depths on a plane, and predicting the recovery ratio of the actual oil reservoir.
The three-dimensional physical simulation experiment method for the viscosity-reducing flooding common heavy oil reservoir is based on the research on the three-dimensional physical simulation method for the viscosity-reducing flooding common heavy oil reservoir, and comprises the steps of three-dimensional equal-proportion reservoir model manufacturing, 3D printing of an aluminum pressure-maintaining cabin, three-dimensional equal-proportion model packaging, and well pattern and saturation measuring point arrangement. Based on a three-dimensional cementing model manufacturing technology and a 3D printing technology, a set of oil reservoir simulation device manufacturing method for displacement of reservoir oil after viscosity reducer is added into water-driven common heavy oil is formed. The pressure resistance of the oil reservoir simulation device reaches 5MPa; the temperature resistance reaches 95 ℃, and the actual conditions of the water-flooding common heavy oil reservoir are met. The model is light and convenient to manufacture.
The simulation method provided by the invention adopts 3D printing of the aluminum ballast. The advantage that 3D printing technology can print irregular shapes is utilized to print the pressure-maintaining chamber of the cemented three-dimensional model. The ballast shape may be varied in accordance with the simulated reservoir shape. The pressure maintaining cabin can realize comprehensive fit of all angles of the cementing model.
The simulation method provided by the invention adopts the three-dimensional artificial cemented rock core to better simulate the pore structure characteristics and the oil reservoir geometric shape of the reservoir. Meanwhile, according to a similar theory, the irregular shape (sand body boundary or oil-water boundary and oil reservoir thickness) of the oil reservoir is simulated in an equal proportion. And simulating a regular well pattern and an irregular well pattern according to the actual arrangement condition of the well pattern of the oil reservoir. And detecting the production conditions of liquid production, oil production and the like of different single wells, and predicting the recovery ratio of the actual oil reservoir.
Drawings
FIG. 1 is a flowchart of a specific embodiment of a three-dimensional physical simulation experiment method for viscosity-reducing flooding common heavy oil reservoirs according to the present invention;
FIG. 2 is a schematic diagram of a specific embodiment of an apparatus used in the three-dimensional physical simulation experiment method for viscosity reduction flooding of a common heavy oil reservoir according to the present invention;
FIG. 3 is a graph showing the distribution of the remaining oil in the different stages of viscosity reduction and flooding for 4 blocks of grass according to an embodiment of the present invention;
FIG. 4 is a diagram of the distribution of residual oil at different stages of viscosity reduction and flooding of 17 blocks of gold in an embodiment of the present invention.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of the stated features, steps, operations, and/or combinations thereof, unless the context clearly indicates otherwise.
As shown in fig. 1, fig. 1 is a flow chart of a three-dimensional physical simulation experiment method for viscosity-reducing flooding common heavy oil reservoirs according to the present invention.
And 2, mixing the natural river sand with different meshes and mixing epoxy resin. And (3) pressing the cementing model into a wet model with a cubic shape according to the pressing pressure and time determined in the step (1). And (3) firing, curing and forming the wet model at the high temperature of 750 ℃.
And 3, carrying out numerical control engraving on the cubic cementation model formed by pressing according to the three-dimensional size and the similar theory of the oil reservoir geological model to form the equal-proportion oil reservoir model. And (3) simulating the irregular shape (sand body boundary or oil-water boundary and oil reservoir thickness) of the oil reservoir in an equal proportion at each angle of the equal proportion oil reservoir model, and ensuring that the geometrical shapes of the oil reservoirs are completely similar.
And 4, coating high-temperature sealant (the temperature resistance reaches 200 ℃) on the oil reservoir model with the equal proportion. And after the sealant is dried, repeatedly coating the sealant for 2-3 times to complete the sealing and storage of the oil reservoir model with the equal proportion. The temperature resistance of the oil reservoir model reaches 95 ℃.
And 5, modeling the 3D printing pressure maintaining cabin according to the size of the three-dimensional cemented artificial stereoscopic equal-proportion oil reservoir model. And printing the aluminum material three-dimensional cementing model pressure-maintaining cabin by using a 3D printer. When printing the holding pressure chamber of the consolidated three-dimensional model, the shape of the holding pressure chamber can be changed according to the change of the simulated reservoir shape. The 3D aluminum pressure maintaining cabin realizes comprehensive coincidence of all angles of the cementing model. Meanwhile, the aluminum material has high hardness, and can realize pressure maintaining and bearing of the three-dimensional equal-proportion reservoir model. The maximum withstand voltage is 5MPa.
And 6, filling the 3D aluminum pressure maintaining cabin with half cabin high-temperature sealant, and placing the sealed three-dimensional equal-proportion oil reservoir model into the 3D aluminum pressure maintaining cabin. And putting the two into a vacuum drier, vacuumizing, and completely pumping air in the high-temperature sealant. The sealing strength of the high-temperature sealant is ensured. And after the high-temperature sealant is solidified, forming a three-dimensional equal-proportion oil reservoir model with a pressure cabin. Through the steps, based on a three-dimensional cementing model manufacturing technology and a 3D printing technology, a three-dimensional equal-proportion reservoir model and a 3D printing aluminum pressure-maintaining cabin are adopted, and a set of reservoir simulation device for viscosity-reducing composite oil displacement of common water-driven heavy oil is formed. Can cover the actual conditions of the water-drive common heavy oil reservoir of the victory oil field. The model is light and convenient to manufacture.
And 7, calculating regular well patterns, well distances, irregular well patterns and well distances in the three-dimensional equal-proportion oil reservoir model according to the actual arrangement conditions of the well patterns and the well distances of the oil reservoir. And carrying out well location positioning and drilling in the three-dimensional equal-proportion oil reservoir model with the pressure chamber.
And 8, installing a pressure measuring pipeline and a saturation test probe, detecting the production conditions of liquid production, oil production, pressure and the like of different single wells, synchronously detecting the saturation changes of different well distances and different longitudinal depths on a plane, and predicting the recovery ratio of an actual oil reservoir.
The following are several specific examples to which the present invention may be applied.
Example 1:
in specific example 1 to which the present invention is applied, as shown in fig. 2, fig. 2 is a schematic view of an apparatus adopted in the viscosity-reducing flooding common heavy oil reservoir three-dimensional physical simulation experiment method of the present invention.
The technical scheme for designing the three-dimensional physical simulation experiment device for the viscosity-reducing flooding common heavy oil reservoir is as follows: (1) 1 is a high-precision Isco pump as an injection system; (2) 3, a three-dimensional cemented artificial stereo equal-proportion oil reservoir model; 4 is a 3D aluminum ballast; 8. 9, 10 are resistance detection sensors, and saturation at different positions in the test model forms saturation change fields at different stages; (3) 7 is a resistance data acquisition and signal conversion module; (4) 11 and 12 are oil and water metering outlets of produced liquid; (5) 5, 18 are produced liquid oil-water separation and water yield metering balances for metering oil yield and water yield in different stages; (6) 13 and 14 are pressure transmission pipelines at different positions in the model; (7) 6 is a pressure detection and data conversion module; (8) 15, 16 are production well bores and 17 are injection well bores; (9) 2 is a computer that collects and stores 5, 18, 6, 7 generated mass, pressure and resistance signals.
Viscosity reduction drives ordinary viscous crude oil reservoir three-dimensional physical simulation experimental apparatus:
1) Three-dimensional cemented artificial solid equal-proportion reservoir models (3, 4) with pressure measuring pipelines (13, 14) and resistance detecting probes (8, 9, 10) installed are connected with a resistance data acquisition and signal conversion module (7) and a pressure detection and data conversion module (6).
2) The three-dimensional cemented artificial solid equal proportion reservoir models (3, 4) are connected with produced liquid oil-water separation and water yield metering balances (5, 18).
3) An injection well bore (17) is connected to the Isco pump. The injection rate of the injection pump is set according to the similar theoretical formula (1).
Similar theoretical formula:
4) And injecting simulated formation water into the model by using an Isco pump, and checking whether the model has a leakage point.
5) Injecting simulated oil into the model by an Isco pump to drive water by the oil and form bound water.
6) Water flooding or viscosity reducer flooding. And the oil-water separation and water yield measurement balance (5, 18) of produced liquid is converted into an oil-containing saturation distribution field through a resistance data acquisition and signal conversion module (7), a pressure detection and data conversion module (6) and the oil-water separation and water yield measurement balance, and the recovery ratio is calculated.
And (3) calculating the recovery ratio of different oil reservoirs at different development stages according to a recovery ratio calculation formula (2) in the three-dimensional physical simulation oil displacement experiment.
η＝E D ×E V ......................(1)
In the formula:
η -recovery ratio,%;
E D -volume fraction of crude oil driven out of the model,%;
E V The pore volume fraction,% of swept in the u _model.
The invention provides a three-dimensional physical simulation experiment method for a viscosity-reducing flooding common heavy oil reservoir. The method has a good application effect in three-dimensional physical simulation of a plurality of blocks of grass 4, gold 17 and the like, and effectively guides the development practice of a mining field of viscosity-reducing and flooding common heavy oil reservoirs.
Example 2:
in the specific embodiment 2 applying the invention, according to the physical properties of the reservoir of 4 grasses, a three-dimensional cemented artificial stereo equal-proportion oil reservoir model making method is adopted, and the parameters of the three-dimensional model are as follows:
| target block | Size of model | Average permeability | Average porosity | |
| Grass | ||||
| 4 |
40×40×4cm | 248.3mD | 29.1％ | Five-point method |
In the specific embodiment 2 applying the invention, according to the situation that 4 grass oil reservoirs are subjected to water flooding development in the early stage, three-dimensional physical simulation of water flooding, viscosity reduction oil displacement agent flooding after water flooding and viscosity reduction transfer composite flooding is developed. According to a produced fluid calculation formula, the recovery ratio change conditions of different displacement stages are obtained as follows:
FIG. 3 is a graph of the residual oil distribution for 4 examples of grass. The residual oil in a water-drive swept area is mainly used for carrying out viscosity reduction oil displacement agent drive after water drive according to the residual oil distribution analysis in different stages, and the spreading effect is small. The conversion of viscosity reduction composite flooding can enlarge the sweep range and further greatly improve the recovery efficiency.
Example 3:
in the specific embodiment 3 to which the present invention is applied, a three-dimensional cemented artificial solid equal-proportion oil reservoir model making method is adopted according to the reservoir physical properties of 17 gold blocks, and the parameters of the three-dimensional cemented artificial solid equal-proportion oil reservoir model making method are as follows:
| target block | Size of model | Average permeability | Average porosity | |
| Gold | ||||
| 17 |
30×30×3cm | 1018mD | 32.1％ | Five-point method |
In the specific embodiment 3 applying the invention, according to the reservoir conditions of gold 17 reservoirs which are not developed in the early stage, the three-dimensional physical simulation of direct viscosity-reducing oil displacement agent displacement and viscosity-reducing transfer composite displacement is developed. According to a produced fluid calculation formula, the recovery ratio change conditions of different displacement stages are obtained as follows:
FIG. 4 is a graph of residual oil distribution for the gold 17 pieces of the example. The direct viscosity reduction oil displacement agent flooding can realize large-range effective utilization of oil reservoirs according to the distribution analysis of the residual oil at different stages, and the recovery ratio is greatly improved. The converted viscosity reduction compound flooding further expands the sweep range and greatly improves the recovery ratio.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
In addition to the technical features described in the specification, the technology is known to those skilled in the art.
Claims (11)
1. The three-dimensional physical simulation experiment method for the viscosity reduction flooding common heavy oil reservoir is characterized by comprising the following steps of:
step 1, sampling a reservoir core, and analyzing physical parameters;
step 2, mixing epoxy resin with natural river sand with different meshes according to the proportion;
step 3, carrying out numerical control engraving on the cubic cementation model formed by pressing to form an equal proportion oil reservoir model;
step 4, smearing high-temperature sealant on the oil reservoir model in the equal proportion;
step 5, modeling a 3D printing pressure maintaining cabin according to the size of the three-dimensional cemented artificial stereoscopic equal-proportion oil reservoir model;
step 6, filling half-cabin high-temperature sealant into a 3D aluminum pressure-maintaining cabin, and placing the sealed and stored three-dimensional equal-proportion oil reservoir model into the 3D aluminum pressure-maintaining cabin;
step 7, calculating regular well patterns, well distances, irregular well patterns and well distances in the three-dimensional equal-proportion oil reservoir model;
and 8, detecting the production condition, synchronously detecting the saturation changes of different well distances and different longitudinal depths of the plane, and predicting the recovery ratio of the actual oil reservoir.
2. The three-dimensional physical simulation experiment method for the viscosity-reducing flooding common heavy oil reservoir is characterized in that in the step 1, a reservoir core is sampled, and the physical parameters of porosity, permeability and particle size are analyzed; determining the mass ratio of different particle sizes of the natural river sand according to the physical analysis data of the rock core; the proportion of the natural river sand with different meshes ensures that the rounding degree of the model particles is closer to that of the reservoir rock particles.
3. The three-dimensional physical simulation experiment method for the viscosity-reducing and flooding common heavy oil reservoir according to claim 2, wherein in the step 1, the pore structure characteristics of the artificial cementation model and the reservoir rock core are contrastively analyzed according to the pore structure characteristics obtained in the mercury intrusion experiment, the model pressing pressure and the pressing time are determined, and the similarity of the pore structure characteristics of the artificial cementation model and the reservoir rock core is ensured.
4. The three-dimensional physical simulation experiment method for viscosity-reducing flooding common heavy oil reservoirs according to claim 1, characterized in that in step 2, the cementing model is pressed into a wet model in a cubic shape according to the pressing pressure and time determined in step 1, and the wet model is subjected to high-temperature firing at 750 ℃ for curing and molding.
5. The three-dimensional physical simulation experiment method for the viscosity-reducing flooding common heavy oil reservoir according to claim 1, characterized in that in step 3, according to the three-dimensional size and the similarity theory of the reservoir geological model, the cube-shaped cementing model formed by pressing is subjected to numerical control engraving to form an equal-proportion reservoir model; and each angle of the equal-proportion oil reservoir model simulates the irregular shape of the oil reservoir in equal proportion, so that the geometrical shapes of the oil reservoirs are completely similar.
6. The three-dimensional physical simulation experiment method for viscosity-reducing flooding common heavy oil reservoir according to claim 1, characterized in that in step 4, the equivalent proportion reservoir model is coated with high-temperature sealant, and the temperature resistance reaches 200 ℃; after the sealant is dried, repeatedly coating the sealant for 2-3 times to complete the sealing and storage of the oil reservoir model with the equal proportion; the temperature resistance of the oil reservoir model reaches 95 ℃.
7. The three-dimensional physical simulation experiment method for the viscosity-reducing flooding common heavy oil reservoir according to claim 1, characterized in that in step 5, 3D printing pressure-maintaining cabin modeling is performed according to the size of a three-dimensional cemented artificial stereoscopic equal-proportion reservoir model; and printing the aluminum material three-dimensional cementing model pressure-maintaining cabin by using a 3D printer.
8. The three-dimensional physical simulation experiment method for viscosity-reducing flooding of common heavy oil reservoirs according to claim 7, wherein in step 5, when printing the pressure-maintaining chamber of the cementing three-dimensional model, the shape of the pressure-maintaining chamber can be changed according to the change of the simulated reservoir shape; the 3D aluminum pressure maintaining cabin realizes comprehensive coincidence of all angles of the cementing model; meanwhile, the hardness of the aluminum material is high, so that the pressure maintaining and bearing of the three-dimensional equal-proportion reservoir model can be realized; the maximum withstand voltage was 5MPa.
9. The three-dimensional physical simulation experiment method for viscosity-reducing flooding of the common heavy oil reservoir according to claim 1, wherein in step 6, the half-chamber high-temperature sealant is filled in the 3D aluminum pressure-maintaining chamber, and the sealed three-dimensional equal-proportion reservoir model is placed in the 3D aluminum pressure-maintaining chamber; putting the two into a vacuum drier, vacuumizing, and completely pumping air in the high-temperature sealant; the sealing strength of the high-temperature sealant is ensured; and after the high-temperature sealant is solidified, forming a three-dimensional equal-proportion oil reservoir model with a pressure cabin.
10. The three-dimensional physical simulation experiment method for the viscosity-reducing flooding common heavy oil reservoir according to claim 1, characterized in that in step 7, regular well patterns, well distances, irregular well patterns and well distances in a three-dimensional equal-proportion reservoir model are calculated according to the actual arrangement conditions of the well patterns and the well distances of the reservoir; and carrying out well location positioning and drilling in the three-dimensional equal-proportion oil reservoir model with the pressure chamber.
11. The three-dimensional physical simulation experiment method for viscosity-reducing flooding of the common heavy oil reservoir is characterized in that in step 8, production conditions of liquid production, oil production and pressure of different single wells are detected, saturation changes of different well distances and different longitudinal depths on a plane are synchronously detected, and the recovery ratio of the actual oil reservoir is predicted.
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