CN111810101B - Dynamic analysis method and device for water-drive reservoir - Google Patents
Dynamic analysis method and device for water-drive reservoir Download PDFInfo
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- E—FIXED CONSTRUCTIONS
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- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
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- E—FIXED CONSTRUCTIONS
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- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
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Abstract
The invention relates to a dynamic analysis method and a dynamic analysis device for a water-drive reservoir. The method comprises the following steps: acquiring the accumulated oil production N of the oil reservoir at different moments p Cumulative water production W p Cumulative fluid production L p Water-oil ratio WOR, and crude oil volume coefficient B o (ii) a According to the expression
Calculating apparent accumulated oil production quantity N 'of different moments of the oil deposit' p (ii) a With W p Is ordinate and is represented by N' p Plotting a series of data points for the abscissa; and performing linear regression on the data points to obtain a water flooding characteristic curve relational expression. The device for realizing the method comprises a data acquisition module, a visual accumulated oil production calculation module, a drawing module and a regression module, and also comprises a development index calculation module. The dynamic analysis method and the device for oil reservoir development can calculate the oil reservoir development indexes including the accumulated liquid production amount, the accumulated oil production amount, the water content increasing rate and the exploitation geological reserve, have stronger applicability to actual oil reservoir development data, and have more accurate analysis and prediction results.
Description
Technical Field
The invention belongs to the technical field of oilfield development, and relates to a method and a device for dynamically analyzing a water-drive reservoir.
Background
The water drive characteristic curve method is a commonly used method in oil reservoir dynamic analysis, is a dynamic analysis method for obtaining a linear relation by drawing two related dynamic data on a rectangular coordinate aiming at an oil field developed by water drive, and is usually used for predicting future development indexes of the oil field so as to guide the adjustment and optimization of a subsequent development scheme of the oil field.
The most common water flooding characteristics at present include 4: the method comprises the following steps of A type water drive characteristic curve-a relational expression of logarithm of accumulated water yield and accumulated oil yield, B type water drive characteristic curve-a relational expression of logarithm of accumulated liquid yield and accumulated oil yield, C type water drive characteristic curve-a relational expression of accumulated liquid oil ratio and accumulated liquid yield, and T type water drive characteristic curve-a relational expression of accumulated liquid oil ratio and accumulated water yield. The water flooding characteristic curve types are proposed by Sui Congress scholars Makesimov, sapinofu, simplechaff and Nazaloff respectively and are recommended to be used in the current oil and gas industry standard SY/T5367-2010 oil recoverable reserves calculation method. The theoretical derivation process of the 4 water drive characteristic curve relational expressions of the A, B and C is given by derivation of a water drive curve relational expression in the 'journal of Petroleum' in 1985, derivation and application of a novel water drive curve relational expression in the 'journal of Petroleum' in 1993 and theoretical derivation and application of an empirical formula for determining recoverable reserves by Nazaloff in the 'petroleum exploration and development' in 1995.
However, in the theoretical derivation process of most of the water drive characteristic curves including 4 types of water drive characteristic curves of methyl-ethyl-propyl-butyl, the average water saturation of the stratum is approximately replaced by the water saturation of the output end, and the approximate condition causes that the water drive dynamic rules represented by the water drive characteristic curves have certain difference with the actual oil deposit, and the difference is larger when the oil deposit development index prediction is carried out. Many scholars verify that when the recoverable reserves of the oil field are predicted, the calculation results of the A-type and B-type water drive characteristic curves are larger, and the calculation results of the C-type and D-type water drive characteristic curves are smaller.
Disclosure of Invention
In order to solve the defect that the deviation of the water-drive characteristic curve is large when the oil reservoir development index is predicted, the invention aims to solve the technical problem of providing the oil reservoir development dynamic analysis method based on the water-drive characteristic curve, which can accurately predict the oil reservoir development index.
Accordingly, another technical problem to be solved by the present invention is to provide a reservoir development dynamic analysis device based on water drive characteristic curve, which can accurately predict reservoir development indexes.
Regarding the dynamic analysis method of the water-drive reservoir, the dynamic analysis method of the water-drive reservoir for solving the technical problems comprises the following steps: acquiring the accumulated oil production N of the oil reservoir at different moments p Cumulative water production W p Cumulative fluid production L p Water-oil ratio WOR, and crude oil volume coefficient B o (ii) a Calculating apparent accumulated oil production N of oil reservoir at different moments p ', its calculation formula is:
with W p Is ordinate and is represented by N' p Plotting a series of data points for the abscissa; and performing linear regression on the data points to obtain a water flooding characteristic curve relational expression.
In the dynamic analysis method of the water drive reservoir, the formula form of the relation of the water drive characteristic curve is as follows:
wherein a is the intercept of the regression curve, and b is the slope of the regression curve.
For the water drive characteristic curve relational expression in the water drive reservoir dynamic analysis method, the theoretical method for establishing the relational expression comprises the following steps: substituting the index relational expression of the ratio of the relative permeability of the oil and the water saturation into the relational expression of the ratio of the yield of the two phases of the oil and the water and the relative permeability of the two phases of the oil and the water to obtain a relational expression of the yield of the water phase and the water saturation of the output end; calculating the integral of the water phase yield with respect to time to obtain a relational expression of the accumulated water yield and the water saturation of a production end; obtaining a relational expression between the average water saturation and the water saturation of a production end according to a Buckley-Leverett water flooding theory; obtaining a relational expression of average water saturation and cumulative yield according to a material balance equation; substituting the relational expression of the oil phase yield and the average water saturation and the relational expression of the average water saturation and the water saturation of the output end into the relational expression of the cumulative water yield and the water saturation of the output end to obtain the relational expression of the cumulative water yield and the average water saturation; substituting the relation between the average water saturation and the accumulated yield into the relation between the accumulated water yield and the average water saturation to obtain an expression of the accumulated water yield; logarithms are taken at two ends of the equal sign of the expression of the accumulated water yield, and a constant after the accumulated water yield is omitted, so that a relational expression of the accumulated water yield and the apparent accumulated oil yield is obtained, and the relational expression is the relational expression of the water drive characteristic curve.
As an improvement of the dynamic analysis method of the water-drive reservoir, the development indexes of the reservoir, including the accumulated liquid production amount, the accumulated oil production amount, the water content rise rate and the exploitation geological reserve amount, can be calculated through the water-drive characteristic curve relational expression.
When the calculated development index is the accumulated fluid production amount, the dynamic analysis method of the water-drive reservoir comprises the following steps: selecting the water content f of the oil reservoir at the target moment w (ii) a The water content f at the target time w Crude oil volume coefficient B o Substituting the slope b of the water flooding characteristic curve relational expression into an expression of the accumulated liquid production amount to obtain the accumulated liquid production amount of the oil reservoir under a certain water content; the expression of the accumulated fluid production is as follows:
when the calculated development index is the accumulated oil production, the dynamic analysis method of the water-drive reservoir comprises the following steps: selecting the water content f of the oil reservoir at the target moment w (ii) a The water content f at the target time w Substituting the intercept a and the slope b of the relational expression of the water drive characteristic curve into an expression of the accumulated oil yield to obtain the accumulated oil yield of the oil reservoir under a certain water content; the expression of the cumulative oil production is as follows:
when the calculated development index is the water cut increasing rate, the dynamic analysis method of the water drive reservoir comprises the following steps: selecting the water content f of the oil reservoir at the target moment w (ii) a The water content f at the target time w Substituting the geological reserve N of the crude oil and the slope b of the water-flooding characteristic curve relational expression into a water content increasing rate expression to obtain the water content increasing rate of the oil at a certain water content; the expression of the water content rising rate is as follows:
when the calculated development index is geological reserve exploitation, the dynamic analysis method of the water-drive reservoir comprises the following steps: performing regression on data points of a core oil-water relative permeability test experiment according to an exponential relation between the ratio of the oil-water relative permeability and the water saturation to obtain a negative value m of an exponential term regression coefficient; the regression value m and the saturation S of the irreducible water are calculated wc Substituting the slope b of the relation of the water drive characteristic curve into an expression of the oil reservoir utilization geological reserve to obtain the oil reservoir utilization geological reserve; the expression for mobilizing geological reserves is:
as for the water drive reservoir dynamic analysis device, the water drive reservoir dynamic analysis device for solving the technical problems comprises the following modules: a data acquisition module for acquiring the cumulative oil production N of the oil reservoir at different times p Cumulative water production W p Cumulative fluid production L p Water-oil ratio WOR, and crude oil volume coefficient B o (ii) a The cumulative oil production calculation module is based on an expression
Calculating apparent accumulated oil production quantity N 'of different moments of the oil deposit' p (ii) a Drawing module with W p Is ordinate and is N' p Plotting a series of data points for the abscissa; and the regression module is used for performing linear regression on the data points drawn by the drawing module to obtain a water flooding characteristic curve relational expression.
In the water drive reservoir dynamic analysis device, the formula form of the water drive characteristic curve relational expression obtained by the regression module is a formula (2).
As an improvement of the water-drive reservoir dynamic analysis device, the device comprises a development index calculation module after a regression module, and the development index calculation module is used for calculating the development indexes of the reservoir, including the accumulated liquid production amount, the accumulated oil production amount, the water content rising rate and the exploitation geological reserve. In the development index calculation module, the accumulated liquid production is calculated according to a formula (3), the accumulated oil production is calculated according to a formula (4), the water content increase rate is calculated according to a formula (5), and the used geological reserve is calculated according to a formula (6).
In the method and the device for dynamically analyzing the water drive reservoir, the water drive characteristic curve is established by theoretical derivation on the basis of the exponential relationship between the ratio of the oil-water relative permeability and the water saturation, a material balance equation and a Buckley-Leverett water drive theory, and compared with the current commonly used water drive characteristic curve, the theoretical derivation process has no approximate condition of the water saturation. Therefore, the water flooding characteristic curve of the invention can present a better linear relation in oil reservoir development and application. The dynamic analysis method and the dynamic analysis device for oil reservoir development have stronger applicability to actual oil reservoir development data, and the analysis and prediction of oil reservoir development indexes are more accurate.
Drawings
FIG. 1 is a flow chart of a method for analyzing the dynamic behavior of a water-drive reservoir according to the present invention;
FIG. 2 shows the QH oilfield lgW in accordance with an embodiment of the present invention p And N' p Graph of the relationship of (1);
FIG. 3 is a graph of the relationship between the ratio of the oil-water relative permeability of a QH oil field and the water saturation in accordance with an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a water-drive reservoir dynamic analysis device according to the present invention.
Detailed Description
In order to make the objects, technical solutions and features of the present invention clearer, embodiments of the present invention are described in further detail below with reference to the accompanying drawings.
The invention provides a dynamic analysis method of a water-drive reservoir, which comprises the following steps as shown in figure 1: acquiring the accumulated oil production N of the oil reservoir at different moments p Cumulative water production W p Cumulative fluid production L p Water-oil ratio WOR, and crude oil volume coefficient B o (ii) a Calculating apparent accumulated oil production quantity N 'of oil reservoir at different moments' p The calculation formula is as follows:
with W p Is ordinate and is represented by N' p Plotting a series of data points for the abscissa; and performing linear regression on the data points to obtain a water flooding characteristic curve relational expression.
In the dynamic analysis method of the water drive reservoir, the formula form of the relation of the obtained water drive characteristic curve is as follows:
wherein a is the intercept of the regression curve, and b is the slope of the regression curve.
Specifically, the dynamic analysis method of the water drive reservoir provided by the invention is explained by taking a Bohai sea QH oil field as an example. The oil reservoir belongs to an extra-high-hole extra-high-permeability oil reservoir, the geological reserve is 507.98 ten thousand square, the oil reservoir is put into development in 2011 in 5 months, and a 1-injection 4-production well network of a horizontal well is adopted for production in the initial stage; newly adding 1 horizontal water injection well in 4 months in 2013, and converting into 2-injection 4-well production; and (4) in 2016, implementing an adjustment scheme, newly adding 1 horizontal production well and 2 horizontal water injection wells, and converting to 4-injection and 5-production well network production. And (3) observing the exploitation condition of the oil field, and obtaining production data of the oil field in the last 9 years, including the accumulated oil production, the accumulated water production, the accumulated liquid production and the water-oil ratio, as shown in the table 1. The crude oil volume factor of the reservoir was 1.052.
TABLE 1 QH oilfield production data
According to the production data in the table 1, according to a formula (1), calculating apparent cumulative oil production N 'of the oil reservoir at different moments' p The results are shown in Table 2.
TABLE 2 QH oil field apparent cumulative oil production calculation
The production data in Table 2, as shown in FIG. 2, were used to accumulate water production W p Is ordinate and is based on cumulative oil production N' p Plotting a series of data points for the abscissa; and performing linear regression on the data points to obtain a water flooding characteristic curve relational expression of the QH oil field. After the adjustment scheme is implemented in 2016 and 4 months, the development well pattern of the oil field is changed, the development rule of the development well pattern is changed, and accordingly 2 water drive characteristic curve segments are formed. Wherein, the relation of the water flooding characteristic curve before the implementation of the adjustment scheme is as follows:
that is, the intercept a of the regression curve before the implementation of the modification was-0.4221 and the slope b of the regression curve was 0.0218.
The relation of the water drive characteristic curve after the implementation of the adjustment scheme is as follows:
that is, the intercept a of the regression curve after the adjustment scheme was performed was 1.2769, and the slope b of the regression curve was 0.0166.
For the water drive characteristic curve relational expression in the water drive reservoir dynamic analysis method, the theoretical method for establishing the relational expression specifically comprises the following steps:
according to the experimental result of the relative permeability test of the rock core in the flooding chamber, a series of water saturation S of the output end can be obtained w Relative permeability of oil phase k ro Relative permeability of the aqueous phase k rw Making oil and water under semilogarithmic coordinateRelative permeability ratio
And the water saturation S of the output end w The analysis shows that a good exponential function relationship exists between the two, and the relationship is as follows:
where d and m are constants related to reservoir and fluid properties.
Under the condition of water drive stable seepage, the water and oil phase yield Q under the ground condition is obtained according to Darcy's law w 、Q o Ratio of relative permeability to oil and water phases
The relationship existing between them is:
wherein, mu o Is the underground viscosity of the crude oil in units of mpa.s; mu.s w Underground viscosity of water in mpa.s; b o The volume coefficient of the crude oil is zero dimension; b w Is the volume coefficient of water, and has no dimension.
Substituting the formula (3) into the formula (4) to obtain the water phase yield Q w And the water saturation S of the output end w The relation of (A) is as follows:
obtaining the yield of the aqueous phase Q w With respect to the integration of time, the cumulative water production W can be obtained p And the water saturation S of the output end w The relation of (A) is as follows:
oil phase yield Q o And average water saturation
The relationship between them is:
wherein N is the original geological reserve of crude oil, and the unit is ten thousand square; s wc The original water saturation of the reservoir is dimensionless.
According to Buckley-Leverett water flooding theory, average water saturation
And the water saturation S of the output end w The relationship between them is:
secondly, a material balance equation is introduced, for an actual oil reservoir, when the oil reservoir is not degassed or is degassed little, the oil reservoir is regarded as oil-water two-phase seepage, and the average water saturation of the oil reservoir at any time in the oil-water displacement process
Comprises the following steps:
wherein N is p In units of ten thousand squares, the cumulative oil production.
Substituting the formulas (7) and (8) into the formula (6) to obtain the cumulative water yield W p And average water saturation
The relation of (A) is as follows:
the cumulative water yield W can be obtained by substituting the formula (9) into the formula (10) p The expression of (c) is:
order to
To obtain
Taking logarithm from the two ends of the equal sign of the formula (12) to obtain
Wherein, the first and the second end of the pipe are connected with each other,
as can be seen from equation (13), the cumulative water production W p Must add a constant to account for the cumulative oil production N' p And forming a finished straight line relation on a semilogarithmic coordinate. However, as the production of the oil field continues and the water content and cumulative water production continue to increase, the influence of the constant C becomes smaller. Thus, in the middle and later stages of oilfield development, the constant C may be omitted and the cumulative water production W p And according to the cumulative oil production N' p The linear relation is formed on the semilogarithmic coordinate. And obtaining a formula (2), wherein the formula (2) is a new water drive characteristic curve capable of reflecting the stable seepage rule of the water drive development oil field.
The water drive reservoir dynamic analysis method can calculate the development indexes of the reservoir through the water drive characteristic curve relational expression, wherein the development indexes comprise accumulated liquid production amount, accumulated oil production amount, water content rising rate and used geological reserve, and the expressions for calculating the dynamic indexes are respectively shown below.
Expression for cumulative fluid production:
expression for cumulative oil production:
expression of the rate of rise of water:
exploiting an expression for geological reserves:
specifically, the calculation steps of the development index are still explained by taking the bohai sea QH oil field as an example. When the accumulated liquid production amount, the accumulated oil production amount and the water content increase rate are calculated, the water content f at the oil reservoir target moment is selected w And the intercept and the slope of the water flooding characteristic curve before and after the implementation of the adjustment scheme and other related parameters are respectively substituted into the formulas (3) to (5) for 98 percent. The result of the calculation is: before the implementation of the adjustment scheme, the cumulative liquid production amount of the oil field is 766.64 ten thousand square when the water content of the oil field is 98 percent, the cumulative oil production amount is 85.95 square and the water content increase rate is 0.71 percent; after the implementation of the adjustment scheme, the cumulative liquid production of the oil field with the water content of 98 percent is predicted to be 1403.97 ten thousand square, the cumulative oil production is predicted to be 136.99 square and the water content increase rate is predicted to be 0.39 percent. Compared with the dynamic index prediction results before and after the implementation of the adjustment scheme, the implementation of the adjustment scheme improves the productivity of the oil field and slows down the water content rising speed.
When the geological reserve is used for calculation, the data points of the oil-water relative permeability test experiment of the rock core are regressed according to the index relational expression of the ratio of the oil-water relative permeability and the water saturation in the formula (7) as shown in figure 3, and the negative value m of the regression coefficient of the index term is 14.02; obtaining the saturation S of the irreducible water according to the oil-water relative permeability test experiment wc Is 0.219; and (3) respectively substituting the slopes of the water drive characteristic curves before and after the implementation of the adjustment scheme and other related parameters into a formula (6) to obtain the oil reservoir exploitation geological reserves before and after the implementation of the adjustment scheme. The result of the calculation is: before the conditioning program was implemented, the oil reservoir was in a productive geological reserve of 156.40 ten thousand; after the adjusted well was completed, the oil reservoir was in a productive geological reserve of 286.42 ten thousand squares. Compared with the calculation results of the reserve consumption before and after the implementation of the adjustment scheme, the implementation of the adjustment scheme improves the development effect and improves the reserve consumption degree of the oil field.
In the water drive reservoir dynamic analysis device of the present invention, as shown in fig. 4, the present invention includes the following modules: a data acquisition module for acquiring the cumulative oil production N of the oil reservoir at different times p Cumulative water production W p Cumulative fluid production L p Water-oil ratio WOR, and crude oil volume coefficient B o (ii) a A module for calculating cumulative oil production according to the expression
Calculating apparent accumulated oil production quantity N 'of oil reservoir at different moments' p (ii) a Rendering module with W p Is ordinate and is N' p Plotting a series of data points for the abscissa; and the regression module is used for performing linear regression on the data points drawn by the drawing module to obtain a water flooding characteristic curve relational expression.
In the water drive reservoir dynamic analysis device, the formula form of the water drive characteristic curve relational expression obtained by the regression module is a formula (2).
The water drive reservoir dynamic analysis device can also comprise a development index calculation module behind the regression module, and is used for calculating the development indexes of the reservoir, including the accumulated liquid production amount, the accumulated oil production amount, the water content rise rate and the exploitation geological reserve. In the development index calculation module, the accumulated liquid production is calculated according to a formula (3), the accumulated oil production is calculated according to a formula (4), the water content increase rate is calculated according to a formula (5), and the used geological reserve is calculated according to a formula (6).
The embodiments and examples of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the embodiments and examples, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present invention.
Claims (4)
1. A water flooding reservoir dynamic analysis method is characterized by comprising the following steps:
acquiring the accumulated oil production N of the oil reservoir at different moments p Cumulative water production W p Cumulative fluid production L p Water-oil ratio WOR, and crude oil volume coefficient B o ；
Calculating apparent accumulated oil production quantity N 'of oil reservoir at different moments' p The calculation formula is as follows:
with W p Is ordinate and is represented by N' p Plotting a series of data points for the abscissa;
performing linear regression on the data points to obtain a water flooding characteristic curve relational expression;
the formula form of the relation formula of the water drive characteristic curve is as follows:
wherein, W p To accumulate water production, N p To accumulate oil production, L p To accumulate fluid production, B o The volume coefficient of the crude oil is, WOR is the water-oil ratio, a is the intercept of a regression curve, and b is the slope of the regression curve;
the water flooding characteristic curve is established by theoretical derivation on the basis of an exponential relation between the ratio of oil-water relative permeability and water saturation, a material balance equation and a Buckley-Leverett water flooding theory, compared with the current commonly used water flooding characteristic curve, the theoretical derivation process has no approximate condition of water saturation, and the theoretical method for establishing the relation comprises the following steps: substituting the index relational expression of the ratio of the relative permeability of the oil and the water saturation into the relational expression of the ratio of the yield of the two phases of the oil and the water and the relative permeability of the two phases of the oil and the water to obtain a relational expression of the yield of the water phase and the water saturation of the output end; calculating the integral of the water phase yield with respect to time to obtain a relational expression of the accumulated water yield and the water saturation of a yield end; obtaining a relational expression between the average water saturation and the water saturation of a production end according to a Buckley-Leverett water flooding theory; obtaining a relational expression of average water saturation and cumulative yield according to a material balance equation; substituting the relational expression of the oil phase yield and the average water saturation and the relational expression of the average water saturation and the water saturation of the output end into the relational expression of the cumulative water yield and the water saturation of the output end to obtain the relational expression of the cumulative water yield and the average water saturation; substituting the relation between the average water saturation and the accumulated yield into the relation between the accumulated water yield and the average water saturation to obtain an expression of the accumulated water yield; taking logarithms at two ends of the equal sign of the expression of the accumulated water yield, and omitting a constant after the accumulated water yield to obtain a relational expression of the accumulated water yield and the apparent accumulated oil yield, wherein the relational expression is the relational expression of the water drive characteristic curve.
2. The method for dynamically analyzing a water-drive reservoir according to claim 1, wherein the development indexes of the reservoir, including cumulative fluid production, cumulative oil production, water content increase rate and exploitation geological reserves, are calculated through the water-drive characteristic curve relational expression;
the method for calculating the cumulative fluid production comprises the following steps:
selecting the water content f of the oil reservoir at the target moment w ；
The water content f at the target time w Crude oil volume coefficient B o And substituting the slope b of the water flooding characteristic curve relational expression into an expression of the accumulated liquid production amount, wherein the expression of the accumulated liquid production amount is as follows:
the method for calculating the accumulated oil production comprises the following steps:
selecting the water content f of the oil reservoir at the target moment w ；
The water content f at the target time w Substituting the intercept a and the slope b of the relation of the water drive characteristic curve into an expression of the accumulated oil production, wherein the expression of the accumulated oil production is as follows:
the method for calculating the water content rising rate comprises the following steps:
selecting the water content f of the oil reservoir at the target moment w ；
The water content f at the target time w Substituting the geological reserve N of the crude oil and the slope b of the water drive characteristic curve relational expression into a water content rising rate expression, wherein the water content rising rate expression is as follows:
the method for calculating a exploratory geological reserve comprises the following steps:
performing regression on data points of a core oil-water relative permeability test experiment according to an exponential relation between the ratio of the oil-water relative permeability and the water saturation to obtain a negative value m of an exponential term regression coefficient;
the negative value m of the regression coefficient and the saturation S of the irreducible water wc And substituting the slope b of the water drive characteristic curve relational expression into a geological reserve utilization expression, wherein the geological reserve utilization expression is as follows:
3. an apparatus for the water drive reservoir dynamic analysis method of claim 2, wherein the apparatus comprises the following modules:
a data acquisition module for acquiring the accumulation of the oil deposit at different timesOil production p Cumulative water production W p Cumulative fluid production L p Water-oil ratio WOR, and crude oil volume coefficient B o ；
A module for calculating cumulative oil production according to the expression
Calculating apparent accumulated oil production quantity N 'of different moments of the oil deposit' p ；
Rendering module with W p Is ordinate and is represented by N' p Plotting a series of data points for the abscissa;
the regression module is used for performing linear regression on the data points drawn by the drawing module to obtain a water flooding characteristic curve relational expression;
the formula form of the relation formula of the water flooding characteristic curve is as follows:
wherein, W p To accumulate water production, N p To accumulate oil production, L p To accumulate fluid production, B o And WOR is the water-oil ratio, a is the intercept of the regression curve, and b is the slope of the regression curve.
4. The device for the dynamic analysis method of the water-drive reservoir as claimed in claim 3, further comprising a development index calculation module for calculating the development index of the reservoir, wherein the development index comprises the cumulative liquid production, the cumulative oil production, the water content increase rate and the exploitation geological reserve; in the development index calculation module, the accumulated liquid production amount is calculated according to a formula (3), the accumulated oil production amount is calculated according to a formula (4), the water content increase rate is calculated according to a formula (5), and the used geological reserve is calculated according to a formula (6);
the method for calculating the cumulative fluid production comprises the following steps:
selecting the water content f of the oil reservoir at the target moment w ；
Including the target timeWater rate f w Crude oil volume coefficient B o And substituting the slope b of the water flooding characteristic curve relational expression into an expression of the accumulated liquid production amount, wherein the expression of the accumulated liquid production amount is as follows:
the method for calculating the accumulated oil production comprises the following steps:
selecting the water content f of the oil reservoir at the target moment w ；
The water content f at the target time w Substituting the intercept a and the slope b of the relation of the water drive characteristic curve into an expression of the accumulated oil production, wherein the expression of the accumulated oil production is as follows:
the method for calculating the water content rising rate comprises the following steps:
selecting the water content f of the oil reservoir at the target moment w ；
The water content f at the target time w Substituting the geological reserve N of the crude oil and the slope b of the water drive characteristic curve relational expression into a water content increasing rate expression, wherein the water content increasing rate expression is as follows:
the method of calculating a mobilization geological reserve comprises the steps of:
performing regression on data points of a core oil-water relative permeability test experiment according to an exponential relation between the ratio of the oil-water relative permeability and the water saturation to obtain a negative value m of an exponential term regression coefficient;
the negative value m of the regression coefficient and the saturation S of the irreducible water wc And the water drive characteristic curve is closedSubstituting the slope b of the system formula into an expression of the geological reserve, wherein the expression of the geological reserve is as follows:
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