CN114320271B - Land-phase heavy oil reservoir injection and production well pattern adjustment method based on displacement pressure gradient - Google Patents
Land-phase heavy oil reservoir injection and production well pattern adjustment method based on displacement pressure gradient Download PDFInfo
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Abstract
The invention discloses a land-phase heavy oil reservoir injection well pattern adjustment method based on displacement pressure gradient, which comprises the steps of determining a mobility range of a target oil field starting pressure gradient; analyzing the influence of different displacement pressure gradients on the oil displacement efficiency; analyzing the relation between the oil displacement efficiency and the displacement pressure gradient; establishing a three-dimensional flooding well pattern displacement pressure gradient function calculation formula with well type, well distance and well pattern integrated; providing a water-bearing calculation formula of the oil displacement efficiency of the three-dimensional oil injection well pattern, which aims at maximizing the oil displacement efficiency and merges well pitch and well pattern; respectively making graph plates of relation curves of displacement pressure gradients, injection and production well spacing, oil displacement efficiency and injection and production well spacing when different well types are formed, and guiding the optimal design of the well type, the well spacing and the well pattern; the well type comprises a directional well, a directional well combined horizontal well and a horizontal well. The invention can greatly improve the water drive recovery ratio, guide the development, adjustment, research and implementation of the land-phase thick oil field, and further develop and enrich the high-efficiency development technical system of the land-phase thick oil field.
Description
Technical Field
The invention relates to the technical field of oil field development, in particular to a land-phase heavy oil reservoir oil injection well pattern adjustment method based on displacement pressure gradient, which is used for improving the land-phase heavy oil reservoir development effect and is suitable for the land-phase heavy oil water injection development of an oil field.
Background
The Bohai sea land phase heavy oil reservoir is mainly deposited by a triangular intercontinental phase and a river phase, the average reservoir permeability is 3000mD, and the average underground crude oil viscosity is 200 mPa.s. In the initial stage, the directional well is adopted for the reverse nine-point well pattern development, the injection and production well spacing is 360m, the problems of rapid water rise, large yield decrease and the like are gradually exposed in the middle-high water-containing period, and development and adjustment are needed to improve the development effect.
The existing land-phase heavy oil field oil injection well pattern adjustment method is generally carried out according to reservoir depiction, residual oil description and other achievements, the method is combined with multi-specialty research achievements, has strong comprehensiveness, onsite property and experience, lacks method and theoretical guidance, does not consider the difference between a heavy oil reservoir and a conventional reservoir, namely the heavy oil has a starting pressure gradient and influences on oil displacement efficiency, so that a reasonable displacement pressure gradient is not formed in the reservoir, the displacement front pressure of a partial area is not high enough, the heavy oil starting pressure gradient cannot be overcome, the oil displacement efficiency is lower, and the residual oil is more; or partial area displacement front pressure is too high, is far greater than thick oil starting pressure gradient, and is easy to form a channeling channel although the local displacement efficiency is higher, and the water-flooding development effect is poor due to invalid water circulation between injection and production.
In order to solve the defects of the prior art, a land-phase heavy oil reservoir injection well pattern adjustment method based on displacement pressure gradients is provided, the influences of reservoir starting pressure gradients and different displacement pressure gradients on oil displacement efficiency are analyzed from reservoir physical properties and fluid properties of a target oil field, and the oil displacement efficiency maximization is used as a target, so that a three-dimensional injection well pattern adjustment method integrating well patterns, well spacing and well patterns is established, and the development, adjustment, research and implementation of the land-phase heavy oil field are guided.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a land-phase heavy oil reservoir injection well pattern adjustment method based on displacement pressure gradient, by utilizing the method to guide the injection well pattern adjustment, not only can the water flooding sweep coefficient be improved, but also the oil displacement efficiency can be improved, thereby greatly improving the water flooding recovery ratio, and further developing and enriching a land-phase heavy oil field high-efficiency development technical system.
The invention aims at realizing the following technical scheme:
a land phase heavy oil reservoir injection well pattern adjusting method based on displacement pressure gradient comprises the following specific steps:
Step 1, according to physical properties and fluid properties of a target oil field reservoir, developing an indoor experiment of a starting pressure gradient, analyzing the relation between the starting pressure gradient lambda and the fluidity K/mu, and determining the fluidity range of the starting pressure gradient of the target oil field;
Step 2, developing an indoor water flooding experiment, and analyzing the influence of experimental values dp L1 of different displacement pressure gradients on the flooding efficiency E D1;
Step 3, based on the experimental results obtained in the steps 1 and 2, utilizing a target oilfield digital rock core to establish an oil-water two-phase dynamic pore network simulation model, and analyzing the relation between the oil displacement efficiency E D2 and the reservoir value dp L2 of the displacement pressure gradient;
Step 4, utilizing the superposition principle of the resetting potential theory and the potential, taking a five-point well pattern consisting of 1 water injection well and 4 production wells as a research object, solving a displacement pressure gradient function dp (x, y) of a certain point in an oil layer, and establishing a calculation formula of the displacement pressure gradient function dp (x, y) of the three-dimensional flooding well pattern with the well pattern, the well distance and the well pattern being fused;
Step 5, combining the steps 3 and 4 to obtain a calculation formula of an oil displacement efficiency function E D (x, y) at a certain point in an oil layer, and providing a calculation formula of a three-dimensional injection well pattern oil displacement efficiency function E D (x, y) which aims at maximizing oil displacement efficiency and fuses well type, well distance and well pattern;
Step 6, using the calculated value of the displacement pressure gradient function dp (x, y) of the three-dimensional injection well pattern in the step 4 and the calculated value of the displacement efficiency function E D (x, y) of the three-dimensional injection well pattern in the step 5, taking the displacement pressure gradient and the displacement efficiency as the ordinate, respectively making graph plates of relation between the displacement pressure gradient and the displacement well distance, the displacement efficiency and the injection well distance when different well patterns are formed, and guiding the optimization design of the well type, the well distance and the well pattern; the well type comprises a directional well, a directional well combined horizontal well and a horizontal well.
Further, in step 1, determining the fluidity range of the starting pressure gradient of the target oil field refers to finding the fluidity limit value of the starting pressure gradient in the presence or absence by performing an indoor experiment of the starting pressure gradient in the fluidity range of the target oil field, and regression-analyzing a plurality of sets of starting pressure gradient and fluidity experiment values to obtain the relation between the starting pressure gradient lambda and the fluidity K/mu.
Further, in step 3, an oil-water two-phase dynamic pore network simulation model is established, dynamic changes of the starting pressure and the water film conductivity are considered in the oil-water micro seepage, the micro flow mechanism, the migration rule and the displacement form and the dynamic change rule of the heavy oil in the porous medium under different displacement pressure gradients dp L2 within the range of the fluidity K/mu of the target oil field are researched, the relation between the micro oil displacement efficiency E D2 of the target oil field and the displacement pressure gradients dp L2, namely E D2＝Lg(K/μ)×(dpL2)n, K refers to the permeability, mu refers to the viscosity of the crude oil of the stratum, n is a constant, and can be determined through regression analysis of a plurality of simulated data points.
Further, in step 4, the calculation formula of the displacement pressure gradient function dp (x, y) of the three-dimensional flooding pattern is as follows:
Wherein: e D -oil displacement efficiency,%; dP (x, y) -displacement pressure gradient, MPa/m; q-yield, m 3/d; k-permeability, 10 -3μm2; h, the thickness of the oil layer, m; mu-the viscosity of the crude oil in the formation, mPa.s; r e -oil drainage radius, m; r w -wellbore radius, m; s-skin coefficient, constant; psi-injection well spacing, m; l is half of the horizontal section length of the horizontal well, m; a-producing well constant, 0 representing directional well, 1 representing horizontal well; b-water injection well type constant, 0 represents directional well, 1 represents horizontal well.
Further, in step 5, the displacement pressure gradient function dp (x, y) obtained in step 4 is used to replace the displacement pressure gradient dp L2 in step 3 to obtain a calculation formula E D(x,y)＝Lg(K/μ)×[dp(x,y)]n of a displacement efficiency function E D (x, y) at a certain point in the oil layer, and by using the calculation formula, reasonable well patterns, well patterns and injection and production well distances can be optimized according to physical properties and fluid properties of the target oil field reservoir, so that the displacement efficiency and water-flooding recovery ratio of the oil reservoir are improved.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
1. The method is based on reservoir physical properties and fluid properties of a target oil field, analyzes the influence of the oil reservoir starting pressure gradient and different displacement pressure gradients on the oil displacement efficiency, aims at maximizing the oil displacement efficiency, and establishes the three-dimensional oil injection well pattern adjusting method of the fusion well type, well spacing and well pattern, so that the water drive wave and coefficient can be improved, the oil displacement efficiency can be improved, the water drive recovery ratio can be greatly improved, the high-efficiency development technical system of the land-phase heavy oil field can be further developed and enriched, technical support and theoretical guidance can be provided for the design of the land-phase heavy oil reservoir well pattern, and the method is suitable for the land-phase heavy oil water injection development oil field. The method of the invention sequentially guides the development, adjustment and research and implementation of the high water content period in 16 offshore land phase heavy oil fields such as Qinhuang island 32-6 and seiid island 36-1, the reverse nine-point well pattern of the directional well is adjusted to the five-point well pattern of the horizontal well combined directional well, the injection and production well spacing is adjusted to 220-260 m from 350-400 m, the oil reservoir displacement pressure gradient is improved by 1.2-1.6 times, the water drive wave and coefficient is improved by 30-40%, and the oil displacement efficiency is improved by 20-30%. The total number of developed wells 989 is twelve and five, the horizontal well accounts for more than 60%, the average single well yield of a new well is 60-80 tons/day, and the average single well yield is 2-3.0 times that of an old well; the average single well water content of the new well is 20% -40% and the average single well water content of the old well is 80% -90%. Through development and adjustment, the oil extraction speed of the main oil field is improved from 1.3% to 2.3%, the average annual oil production is increased by 600 ten thousand tons, the water drive recovery ratio is improved from 24.5% to 38.6%, the high-speed and high-efficiency development in a medium-high water-cut period is realized, important contribution is made to the 3000 ten thousand tons of oil field in the Bohai sea in 2010 and continuous stable production, and experience is provided for similar oil field development and adjustment.
2. The oil displacement pressure gradient of the oil reservoir is increased based on the optimization of the injection well pattern, so that the oil displacement efficiency is improved, and the oil displacement pressure gradient of the oil reservoir is also increased based on the optimization of injection parameters, namely, the combination of optimizing injection and production structure adjustment, so that the oil field development effect in the middle and high water period is improved. In the thirteenth to fifth step, the Bohai sea main force oil field gradually enters into the double-high stage, and development of strengthening water flooding and increasing yield and diving are needed to realize continuous stable yield. The method guides 20 oil fields such as 36-1 in the seiid, 32-6 in the Qin island, 28-2 in the Bohai island, 25-1 in the Bohai island and the like to perform layered injection allocation, water shutoff, profile control and the like to improve water flooding measures by about 4000 times, greatly improves the flooding pressure gradient and flooding efficiency of various longitudinal oil layers and planes in each direction, powerfully ensures the efficient development of 'double high' oil fields, improves the water flooding development effect, reduces the natural progressive rate from 13.5% to 10.8%, reduces the water content ascending rate from 1.9% to 1.3%, further enriches the efficient development technical system of the 'double high' stage of the offshore oil field, and has higher popularization value in similar oil fields.
Drawings
FIG. 1 is a schematic flow chart of the method of the present invention;
FIG. 2 is a graph showing the relationship between the starting pressure gradient and fluidity of Qin Royal island 32-6 oil field according to the embodiment of the invention;
FIG. 3 is a graph showing the relationship between water content and oil displacement efficiency at different flow rates of Qin Royal island 32-6 oilfield cores according to an embodiment of the invention;
FIG. 4 is a graph showing the relationship between displacement efficiency and displacement pressure gradient under different displacement pressure gradients of Qin Royal island 32-6 oil fields according to an embodiment of the invention;
fig. 5a to 5c are schematic diagrams of a directional well five-point well pattern and a directional well combined horizontal well five-point well pattern and an adjustment well pattern of the horizontal well five-point well pattern in the Qin dynasty island 32-6 oilfield according to the embodiment of the invention;
FIG. 6 is a graph showing the relationship between the pressure gradient and the injection and production well spacing of the Qin Royal island 32-6 oil field according to the embodiment of the invention;
FIG. 7 is a graph showing the relationship between oil displacement efficiency and injection and production well spacing of Qin Royal island 32-6 oil fields according to an embodiment of the invention;
Fig. 8a is a schematic diagram of a reverse nine-point well pattern of the directional well before adjustment, and fig. 8b is a schematic diagram of a five-point well pattern of the directional well combined with the horizontal well after adjustment.
Detailed Description
The key of the land-phase heavy oil reservoir injection well pattern adjustment method based on the displacement pressure gradient is to determine the target oil field starting pressure gradient and the influence rule of the target oil field starting pressure gradient on the oil displacement efficiency, and establish a three-dimensional injection well pattern oil displacement efficiency calculation formula which aims at maximizing the oil displacement efficiency and merges well type, well distance and well pattern. For a better understanding of the present invention, its features and advantages, reference is now made to the following examples, which are illustrated in detail in connection with the accompanying drawings, the detailed flow of which is illustrated in fig. 1:
Taking the offshore Qin island 32-6 oil field as an example, the oil field reservoir is deposited in a river phase, the reservoir permeability is 126-3200 mD, and the average permeability is 3000mD; the viscosity of the stratum crude oil is 78-260 mPas, and the average viscosity is 200 mPas. The initial development of the directional well reverse nine-point well pattern is adopted, the injection and production well spacing is 320-400 m, the average is 360m, and the production is put into production in 10 months of 2001. Under the basic well pattern development condition, the predicted recovery ratio is only 21.6%, and development and adjustment are needed to improve the oil field development effect.
Step 1, 8 groups of artificial cores are selected according to physical properties of reservoir layers of the Qin Royal island 32-6 oil fields, and the gas permeability of the cores is measured at 93-2831 mD, and the average permeability is 3000mD; according to the viscosity value of the crude oil of the stratum, the simulated oil viscosity is configured to be 71-266 mPas at the indoor constant temperature of 25 ℃ and the average value is 164 mPas. Measuring a starting pressure gradient after the rock core is saturated with formation water and the oil displacement establishes irreducible water saturation, and analyzing the relation between the starting pressure gradient and the fluidity, as shown in fig. 2;
Step 2, selecting a group of cores, measuring the permeability 3000mD of the cores by gas, configuring the viscosity 164 mPa.s of the simulated oil, measuring the displacement efficiencies E D1 of the displacement speeds (displacement pressure gradient dp L1) of 0.4ml/min, 0.7ml/min, 1.0ml/min and 1.3ml/min respectively, and analyzing the influence relationship of different displacement speeds (equivalent to different displacement pressure gradients dp L1) on the displacement efficiency E D1, as shown in figure 3;
Step 3, an oil-water two-phase dynamic pore network simulation model based on a target oilfield digital core is established, a displacement pressure gradient is 0.003MPa/m、0.004MPa/m、0.005MPa/m、0.007MPa/m、0.009MPa/m、0.010MPa/m、0.012MPa/m、0.015MPa/m、0.020MPa/m、0.030MPa/m for simulation research, and the relationship between the microcosmic oil displacement efficiency E D2 and the displacement pressure gradient dp L2 is analyzed, as shown in fig. 4; and regressing a relation between the oil displacement efficiency, the target oilfield fluidity and the displacement pressure gradient, namely E D2＝Lg(K/μ)×(dpL2)0.17. The pore network simulation is a numerical simulation for idealizing a complex porous medium into a mutually communicated pore network, simulating a micro flow mechanism and an migration rule of fluid in the porous medium based on a percolation theory and a micro percolation physics in statistics, and is different from a conventional discrete numerical method for solving a continuous medium.
Step 4, using the principle of superposition of reset potential theory and potential, taking a five-point well pattern consisting of 1 water injection well and 4 production wells as a research object, as shown in fig. 5a to 5c, solving a displacement pressure gradient function dp (x, y) of a certain point in an oil layer, and establishing a calculation formula of the displacement pressure gradient function dp (x, y) of the three-dimensional injection well pattern with the combination of well type, well spacing and well pattern:
Wherein: e D -oil displacement efficiency,%; dP (x, y) -displacement pressure gradient, MPa/m; q-yield, m 3/d; k-permeability, 10 -3μm2; h, the thickness of the oil layer, m; mu-the viscosity of the crude oil in the formation, mPa.s; r e -oil drainage radius, m; r w -wellbore radius, m; s-skin coefficient, constant; psi-injection well spacing, m; l is half of the horizontal section length of the horizontal well, m; a-producing well constant, 0 representing directional well, 1 representing horizontal well; b-water injection well type constant, 0 represents directional well, 1 represents horizontal well.
Step 5, replacing the displacement pressure gradient dp (x, y) obtained in the step 4 with the displacement pressure gradient dp L2 in the step 3 to obtain a calculation formula E D(x,y)＝Lg(K/μ)×[dp(x,y)]0.17 of displacement efficiency at a certain point in an oil layer, thereby establishing a calculation formula of a three-dimensional flooding pattern displacement efficiency function E D (x, y) which aims at maximizing the displacement efficiency and fuses well type, well spacing and well pattern:
and 6, according to the displacement pressure gradient calculation formula of the three-dimensional injection well pattern in the step 4 and the displacement efficiency calculation formula of the three-dimensional injection well pattern in the step 5, taking the injection well distance as an abscissa and the displacement pressure gradient and the displacement efficiency as an ordinate, and making curve plates of the relation between the displacement pressure gradient and the injection well distance and between the displacement efficiency and the injection well distance when different well types (directional well, directional well combined horizontal well and horizontal well) are made, as shown in fig. 6 and 7.
As can be seen from fig. 6 and 7: (1) The displacement pressure gradient can be improved by reducing the injection and production well spacing, so that the oil displacement efficiency is improved. When the injection well spacing is larger than 500m, the oil reservoir pressure gradient is smaller than 0.005MPa/m, the starting pressure is not overcome, at the moment, the porous medium is mainly flowed by a water film, and the filling proportion of the piston type and the pore body is small, so that the oil displacement efficiency is smaller than 60.0%. When the injection well spacing is gradually reduced from 500m to 200m, the displacement pressure gradient is increased to 0.00892MPa, the starting pressure is completely overcome, the piston type displacement is used as the main part, and the oil displacement efficiency reaches 65.6%. (2) Compared with a directional well, the horizontal well can improve the displacement pressure gradient by 35-40%, so that the oil displacement efficiency is improved by 5.0% -6.0%, and therefore, the horizontal well pattern of the offshore heavy oil reservoir is optimal, and the combined well pattern of the directional well and the horizontal well is the next. (3) Under certain conditions of well pattern well type and well spacing, when the skin coefficients are 0, 5 and 10, the displacement pressure gradient and the displacement efficiency are large, so that the displacement pressure displacement can be improved by improving the well shaft perfection degree, and the displacement efficiency is improved. In combination with the analysis, the initial stage of the Qin Royal island 32-6 oil field adopts a directional well reverse nine-point well pattern, and the Qin Royal island 32-6 development and adjustment strategy is determined to be that the directional well is combined with a horizontal well injection well pattern, and the injection well distance is adjusted from 360m to 220m, as shown in fig. 8a and 8 b. The development and adjustment of the Qin Royal island 32-6 oil field are started to be implemented in 6 months of 2013, and are completed in 7 months of 2015, 124 horizontal wells are implemented in total, and the initial average single well oil yield is 65m 3/d which is 3 times that of the old wells; the initial water content was 22% and the old well water content was 86%. Through development and adjustment, the comprehensive water content of the Qin Royal island 32-6 oil field is reduced to 79% from 88%, the oil extraction speed is improved to 2.1% from 0.8%, and the recovery ratio is improved by 35.6% from 21.6%.
The invention is not limited to the embodiments described above. The above description of specific embodiments is intended to describe and illustrate the technical aspects of the present invention, and is intended to be illustrative only and not limiting. Numerous specific modifications can be made by those skilled in the art without departing from the spirit of the invention and scope of the claims, which are within the scope of the invention.
Claims (5)
1. A land phase heavy oil reservoir injection well pattern adjusting method based on displacement pressure gradient is characterized by comprising the following specific steps:
Step 1, according to physical properties and fluid properties of a target oil field reservoir, developing an indoor experiment of a starting pressure gradient, analyzing the relation between the starting pressure gradient lambda and the fluidity K/mu, and determining the fluidity range of the starting pressure gradient of the target oil field;
Step 2, developing an indoor water flooding experiment, and analyzing the influence of experimental values dp L1 of different displacement pressure gradients on the flooding efficiency E D1;
Step 3, based on the experimental results obtained in the steps 1 and 2, utilizing a target oilfield digital rock core to establish an oil-water two-phase dynamic pore network simulation model, and analyzing the relation between the oil displacement efficiency E D2 and the reservoir value dp L2 of the displacement pressure gradient;
Step 4, utilizing the superposition principle of the resetting potential theory and the potential, taking a five-point well pattern consisting of 1 water injection well and 4 production wells as a research object, solving a displacement pressure gradient function dp (x, y) of a certain point in an oil layer, and establishing a calculation formula of the displacement pressure gradient function dp (x, y) of the three-dimensional flooding well pattern with the well pattern, the well distance and the well pattern being fused;
Step 5, combining the steps 3 and 4 to obtain a calculation formula of an oil displacement efficiency function E D (x, y) at a certain point in an oil layer, and providing a calculation formula of a three-dimensional injection well pattern oil displacement efficiency function E D (x, y) which aims at maximizing oil displacement efficiency and fuses well type, well distance and well pattern;
Step 6, using the calculated value of the displacement pressure gradient function dp (x, y) of the three-dimensional injection well pattern in the step 4 and the calculated value of the displacement efficiency function E D (x, y) of the three-dimensional injection well pattern in the step 5, taking the displacement pressure gradient and the displacement efficiency as the ordinate, respectively making graph plates of relation between the displacement pressure gradient and the displacement well distance, the displacement efficiency and the injection well distance when different well patterns are formed, and guiding the optimization design of the well type, the well distance and the well pattern; the well type comprises a directional well, a directional well combined horizontal well and a horizontal well.
2. The displacement pressure gradient-based land-phase heavy oil reservoir injection well pattern adjustment method of claim 1, wherein in step 1, determining the mobility range of the target oilfield starting pressure gradient refers to finding the mobility limit value of the starting pressure gradient existing and not existing by performing a starting pressure gradient indoor experiment within the target oilfield mobility range, and regression analyzing a plurality of groups of starting pressure gradient and mobility experiment values to obtain the relation between the starting pressure gradient lambda and the mobility K/mu.
3. The displacement pressure gradient-based land-phase heavy oil reservoir injection well pattern adjustment method of claim 1, wherein in step 3, an oil-water two-phase dynamic pore network simulation model is established, dynamic changes of starting pressure and water film conductivity are considered in oil-water micro seepage, a heavy oil micro flow mechanism, a displacement rule and a displacement form and dynamic change rules thereof in a porous medium under different displacement pressure gradients dp L2 within a range of a target oil field fluidity K/mu are researched, the relation between the target oil field micro oil displacement efficiency E D2 and the displacement pressure gradients dp L2, namely E D2＝Lg(K/μ)×(dpL2)n and K refer to the permeability, mu refers to the formation crude oil viscosity, n is a constant, and can be determined through regression analysis of a plurality of simulated data points.
4. The displacement pressure gradient-based land-phase heavy oil reservoir pattern adjustment method of claim 1, wherein in step 4, the three-dimensional pattern displacement pressure gradient function dp (x, y) is calculated as follows:
Wherein: e D -oil displacement efficiency,%; dP (x, y) -displacement pressure gradient, MPa/m; q-yield, m 3/d; k-permeability, 10 -3μm2; h, the thickness of the oil layer, m; mu-the viscosity of the crude oil in the formation, mPa.s; r e -oil drainage radius, m; r w -wellbore radius, m; s-skin coefficient, constant; psi-injection well spacing, m; l is half of the horizontal section length of the horizontal well, m; a-producing well constant, 0 representing directional well, 1 representing horizontal well; b-water injection well type constant, 0 represents directional well, 1 represents horizontal well.
5. The land-phase heavy oil reservoir injection and recovery pattern adjustment method based on the displacement pressure gradient, which is characterized in that in the step 5, the displacement pressure gradient function dp (x, y) obtained in the step 4 is used for replacing the displacement pressure gradient dp L2 in the step 3 to obtain a calculation formula E D(x,y)＝Lg(K/μ)×[dp(x,y)]n of a certain-point oil displacement efficiency function E D (x, y) in an oil layer, and the reasonable well pattern, well pattern and injection and recovery pattern can be optimized according to the physical properties and fluid properties of a target oil field reservoir so as to improve the oil displacement efficiency and water flooding and recovery ratio of the oil reservoir.
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