Method for determining economic limit recovery factor of oil reservoir by steam flooding

Abstract

The present invention relates to the field of reservoir development effect evaluation, and discloses a method for determining the economic limit recovery rate of oil reservoir steam drive. The method comprises the following steps: S1, after determining the general relationship between the recovery degree ER and the oil-gas ratio OSR, determining the oil-gas ratio relationship according to the actual production data of the oil reservoir and the general relationship between the oil-gas ratio OSR; determining the oil price P o 、Daily oil production Q o and economic limit oil-gas ratio OSR min and calculate different oil prices P o And different daily oil production Q o The corresponding economic limit oil-gas ratio OSR min ; S2, according to the economic limit oil-gas ratio OSR min The oil price P is determined by the oil-gas ratio o 、Daily oil production Q o and economic recovery factor ER min S3, according to the oil price P o 、Daily oil production Q o and economic recovery factor ER min The economic limit recovery factor of the target reservoir is determined by the relationship between the actual daily oil production of the target reservoir and the actual oil price. This method can effectively guide the research on the recovery factor calculation of thermal recovery reservoirs and is of great significance for the evaluation of steam flooding development effects and scheme design of heavy oil reservoirs.

Description

Technical Field

[0001] The invention relates to the field of oil reservoir development effect evaluation, and in particular to a method for determining the economic limit recovery rate of oil reservoir steam drive. Background Art

[0002] Steam flooding is an important development method to improve the utilization of heavy oil reserves. It can effectively reduce the viscosity of formation crude oil and improve its fluidity. For steam-driven heavy oil reservoirs, after entering the high-cycle stage, the water content increases, the formation pressure decreases, the difficulty of stable production is high, and the development effect becomes worse. Steam flooding is an effective replacement for steam-driven heavy oil reservoirs. The economic limit recovery rate of steam flooding in heavy oil reservoirs is the recovery rate corresponding to the oil production cost equal to the oil price after the reservoir enters the production decline stage. It is an evaluation indicator of the economic benefits of the reservoir and is of great significance to the improvement of development benefits. However, there are few studies on the economic limit recovery rate of steam flooding in heavy oil reservoirs at home and abroad.

[0003] In view of this, there is an urgent need to provide a method for determining the economic limit recovery factor of steam flooding in oil reservoirs. Summary of the invention

[0004] The purpose of the present invention is to overcome the problem that there is little research on the economic limit recovery rate of steam drive in oil reservoirs in the prior art, and to provide a new method for determining the economic limit recovery rate of steam drive in oil reservoirs, which can effectively guide the research on recovery rate calculation of thermal recovery oil reservoirs, and is of great significance to the evaluation of steam drive development effect and scheme design of heavy oil reservoirs. And it can quickly and accurately determine the economic limit recovery rate of steam drive in oil reservoirs.

[0005] In order to achieve the above object, the present invention provides a method for determining the economic limit recovery factor of oil reservoir steam flooding, comprising the following steps:

[0006] S1. After determining the general formula for the relationship between the recovery degree ER and the oil-gas ratio OSR, determine the oil-gas ratio relationship formula according to the actual production data of the reservoir and the general formula for the oil-gas ratio OSR;

[0007] Determine the oil price P o 、Daily oil production Q o and economic limit oil-gas ratio OSR min and calculate different oil prices P o And different daily oil production Q o The economic limit oil-gas ratio OSR corresponding to α min ;

[0008] S2, according to the economic limit oil-gas ratio OSR min The oil price P is determined by the oil-gas ratio relationship o 、Daily oil production Q o and economic recovery factor ER min The relationship between

[0009] S3, according to the oil price P o 、Daily oil production Q o and economic recovery factor ER min The economic limit recovery factor of the target reservoir is determined based on the relationship between the actual daily oil production of the target reservoir and the actual oil price.

[0010] Preferably, in step S1, the relationship between the recovery degree ER and the oil-steam ratio OSR is determined in the following manner: based on the cumulative steam injection volume N of the reservoir steam flooding s and cumulative oil production N p The general relationship formula of the relationship between the recovery degree ER and the oil-gas ratio OSR is determined.

[0011] Further preferably, the cumulative steam injection amount N based on the steam flooding of the heavy oil reservoir is s and cumulative oil production N p The method for determining the general formula of the relationship between the recovery degree ER and the oil-gas ratio OSR comprises the following steps:

[0012] (1) The cumulative steam injection volume N of the reservoir steam drive s and cumulative oil production N p Taking the derivative of the general relationship with respect to time t, we get the formula:

[0013]

[0014] In the formula, q s is the steam injection rate, q o is the oil production rate, B and C are coefficients;

[0015] (2) Define the instantaneous oil-steam ratio during the reservoir steam flooding stage as OSR = q o / q s , and put it into formula (I) to get the formula:

[0016]

[0017] (3) Substituting formula (II) into the cumulative steam injection volume N of the steam flooding of the heavy oil reservoir s and cumulative oil production N p The formula is obtained from the general formula of the relationship:

[0018]

[0019] In the formula, A is the coefficient;

[0020] (4) Dividing both sides of the formula (III) by the geological reserves N, the general formula for the relationship between the recovery rate ER and the oil-gas ratio OSR is obtained.

[0021] Preferably, in step S1, the general formula for the relationship between the recovery degree ER and the oil-gas ratio OSR is:

[0022]

[0023] Where N is geological reserves, A and B are coefficients.

[0024] Preferably, in step S1, the method for determining the oil-steam ratio relationship according to the actual production data of the reservoir and the general relationship of the oil-steam ratio OSR is as follows: the cumulative steam injection volume N in the actual production data of the reservoir is converted into s and cumulative oil production N p The cumulative steam injection volume N brought into the reservoir for steam flooding s and cumulative oil production N p The coefficient value in the general relationship formula is calculated, and the coefficient value is substituted into the general relationship formula between the recovery degree ER and the oil-gas ratio OSR to obtain the oil-gas ratio relationship formula.

[0025] Preferably, in step S1, the oil price P is determined according to the principle of balance of payments. o 、Daily oil production Q o and economic limit oil-gas ratio OSR min The relationship formula.

[0026] Further preferably, the oil price P is determined o 、Daily oil production Q o and economic limit oil-gas ratio OSR min The relationship is:

[0027]

[0028] In the formula, C i is the average cost of injecting 1 ton of steam, α is the steam thermal recovery rate, r is the interest rate, R is the cost quota related to oil production, I w C is the fixed asset investment allocated to a single well. n is the cost related to the well network, R d The depreciation rate of fixed assets converted to the date.

[0029] Preferably, in step S2, the oil price P o 、Daily oil production Q o and economic recovery factor ER min The relationship is:

[0030]

[0031] In the formula, C i is the average cost of injecting 1 ton of steam, α is the steam thermal recovery rate, r is the interest rate, R is the cost quota related to oil production, Iw C is the fixed asset investment allocated to a single well. n is the cost related to the well network, R d is the fixed asset depreciation rate converted to the date, N is the geological reserves, and A and B are coefficients.

[0032] Preferably, in step S2, according to the oil price P o 、Daily oil production Q o and economic recovery factor ER min The method for determining the economic limit recovery factor of the target reservoir based on the relationship between , the daily oil production of the target reservoir and the actual oil price is:

[0033] According to the oil price P o 、Daily oil production Q o and economic recovery factor ER min The relationship between the oil price P o 、Daily oil production Q o and economic recovery factor ER min After the relationship map is drawn, according to the daily oil production of the target reservoir and the actual oil price, the oil price P o 、Daily oil production Q o and economic recovery factor ER min Find the corresponding target reservoir economic limit recovery factor from the relationship diagram.

[0034] Through the above technical scheme, the determination method provided by the present invention first determines the general formula of the relationship between the recovery degree ER and the oil-gas ratio OSR, and then determines the coefficient of the general formula of the relationship between the recovery degree ER and the oil-gas ratio OSR by fitting the actual reservoir data. The obtained relationship between the recovery degree ER and the oil-gas ratio OSR is used, and then combined with the oil price P o 、Daily oil production Q o and economic limit oil-gas ratio OSR min The relationship between the economic limit recovery factor and the recovery factor of the thermal recovery reservoir is established, which can effectively guide the research on the recovery factor calculation of the thermal recovery reservoir and has important significance for the evaluation of the steam flooding development effect and the design of the scheme of heavy oil reservoirs. It can also quickly and accurately determine the economic limit recovery factor of the steam flooding of the reservoir. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a flow chart of a method for determining the economic limit recovery factor of oil reservoir steam flooding in a specific embodiment of the present invention;

[0036] Figure 2 is a regression curve of cumulative steam injection volume and cumulative oil production data in a specific embodiment of the present invention;

[0037] Figure 3It is a plate of the economic limit recovery factor of the target oil reservoir in a specific embodiment of the present invention. DETAILED DESCRIPTION

[0038] The endpoints and any values ​​of the ranges disclosed in this article are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed in this article.

[0039] As mentioned above, the basic embodiment of the present invention provides a method for determining the economic limit recovery factor of steam flooding in an oil reservoir, such as Figure 1 As shown, the following steps are included:

[0040] S1. After determining the general formula of the relationship between the recovery degree ER and the oil-gas ratio OSR, determine the oil-gas ratio relationship according to the actual production data of the reservoir and the general formula of the oil-gas ratio OSR;

[0041] Determine the oil price P o 、Daily oil production Q o and economic limit oil-gas ratio OSR min and calculate different oil prices P o And different daily oil production Q o The corresponding economic limit oil-gas ratio OSR min ;

[0042] S2, according to the economic limit oil-gas ratio OSR min The oil price P is determined by the oil-gas ratio o 、Daily oil production Q o and economic recovery factor ER min The relationship between

[0043] S3, according to the oil price P o 、Daily oil production Q o and economic recovery factor ER min The economic limit recovery factor of the target reservoir is determined based on the relationship between the actual daily oil production of the target reservoir and the actual oil price.

[0044] In the description of the embodiments of the present invention, the application to the calculation of the economic limit recovery factor of heavy oil is taken as an example. Specifically, heavy oil refers to crude oil with a specific gravity greater than 0.90 and a degassed crude oil viscosity greater than 100 mPa·S at the oil layer temperature. According to the viscosity of heavy oil, heavy oil can be divided into: ordinary heavy oil (degassed oil viscosity at the oil layer temperature is 100-10000 mPa·S, specific gravity is greater than 0.90), extra heavy oil (degassed oil viscosity at the oil layer temperature is 1×10 4 -5×10 4mPa·S, specific gravity greater than 0.95) and super heavy oil (degassed oil viscosity at reservoir temperature is 5×10 4 mPa·S or above, specific gravity greater than 0.98).

[0045] The determination method provided in the above basic embodiment of the present invention first determines the general formula of the relationship between the recovery degree ER and the oil-gas ratio OSR and the oil price P o 、Daily oil production Q o and economic limit oil-gas ratio OSR min Then, the actual reservoir data was fitted on the basis of the general formula of the relationship between the recovery degree ER and the oil-gas ratio OSR, and the coefficient of the general formula of the relationship between the recovery degree ER and the oil-gas ratio OSR was determined. The relationship between the recovery degree ER and the oil-gas ratio OSR was obtained, combined with the oil price P o 、Daily oil production Q o and economic limit oil-gas ratio OSR min The relationship between the economic limit recovery factor and the recovery factor of the thermal recovery reservoir is established, which can effectively guide the research on the recovery factor calculation of the thermal recovery reservoir and has important significance for the evaluation of the steam flooding development effect and the design of the scheme of heavy oil reservoirs. It can also quickly and accurately determine the economic limit recovery factor of the steam flooding of the reservoir.

[0046] In a specific embodiment of the present invention, in step S1, the relationship between the recovery degree ER and the oil-steam ratio OSR is determined in the following manner: based on the cumulative steam injection volume N of the reservoir steam flooding s and cumulative oil production N p The relationship between the recovery rate ER and the oil-gas ratio OSR is determined by the general formula of the relationship. According to the present invention, the cumulative steam injection volume N of the reservoir steam drive s and cumulative oil production N p The general relationship is: ln(N s + C) = A + BN P , where A, B and C are coefficients, and the coefficient data can be determined based on actual reservoir data.

[0047] As a specific embodiment of the present invention, based on the cumulative steam injection volume N of the heavy oil reservoir steam flooding s and cumulative oil production N p The method for determining the general formula of the relationship between the recovery degree ER and the oil-gas ratio OSR comprises the following steps:

[0048] (1) The cumulative steam injection volume N of the reservoir steam drive s and cumulative oil production N p Taking the derivative of the general relationship with respect to time t, we get the formula:

[0049]

[0050] In the formula, qs is the steam injection rate, q o is the oil production rate, N s is the cumulative steam injection volume, B and C are coefficients, and the coefficient data can be determined based on actual reservoir data;

[0051] (2) Define the instantaneous oil-steam ratio during the reservoir steam flooding stage as OSR = q o / q s , and put it into formula (I) to get the formula:

[0052]

[0053] (3) Substituting formula (II) into the cumulative steam injection volume N of steam flooding in heavy oil reservoirs s and cumulative oil production N p The formula is obtained from the general formula of the relationship:

[0054]

[0055] In the formula, A is a coefficient, and the data of this coefficient can be determined based on actual reservoir data;

[0056] (4) Divide both sides of formula (III) by the geological reserves N to obtain the general relationship between the degree of recovery ER and the oil-gas ratio OSR.

[0057] Specifically, in step S1, the general formula for the relationship between the recovery degree ER and the oil-gas ratio OSR is:

[0058]

[0059] Where N is geological reserves, A and B are coefficients. By using the above formula and combining it with the economic limit oil-gas ratio, the actual daily oil production of the target reservoir and the actual oil price, the economic limit recovery factor of the target reservoir can be determined quickly and accurately.

[0060] In a specific embodiment of the present invention, in step S1, the method for determining the oil-steam ratio relationship according to the actual production data of the reservoir and the general relationship of the oil-steam ratio OSR is as follows: the cumulative steam injection volume N in the actual production data of the reservoir is converted into s and cumulative oil production N p Cumulative steam injection volume N brought into the reservoir for steam flooding s and cumulative oil production N p Calculate the coefficient value in the general formula and substitute the coefficient value into the general formula of the relationship between the recovery degree ER and the oil-gas ratio OSR to obtain the oil-gas ratio relationship. Substitute the actual production data of the reservoir into the cumulative steam injection volume and cumulative oil production N of the reservoir steam drive. pThe coefficient value appearing in the general relationship formula can be determined by the general relationship formula, and the oil-gas ratio relationship formula can be determined accurately and quickly, and the obtained relationship formula is more suitable for actual production.

[0061] In a specific embodiment of the present invention, in step S1, the oil price P is determined according to the principle of balance of payments. o 、Daily oil production Q o and economic limit oil-gas ratio OSR min The economic limit oil-gas ratio OSR can be determined more accurately by using the principle of balance of payments. min .

[0062] Specifically, the following formula can be obtained based on the sales revenue of crude oil = cost = cost related to oil production + well-related cost + steam injection cost:

[0063] OSR min P o α(1-r)=OSR min R+OSR min (C n +I w R d )Q o +C i ; In the formula, OSR min is the economic limit oil-gas ratio, P o is the oil price, Q o is the daily oil production, C i is the average cost of injecting 1 ton of steam, α is the steam thermal recovery rate, r is the interest rate, R is the cost quota related to oil production, I w C is the fixed asset investment allocated to a single well. n is the cost related to the well network, R d The depreciation rate of fixed assets converted to the date.

[0064] Further preferably, the oil price P is determined o 、Daily oil production Q o and economic limit oil-gas ratio OSR min The relationship is:

[0065]

[0066] In the formula, C i is the average cost of injecting 1 ton of steam, α is the steam thermal recovery rate, r is the interest rate, R is the cost quota related to oil production, I w C is the fixed asset investment allocated to a single well. n is the cost related to the well network, R dSpecifically, during the measurement process, the above-mentioned parameter data are followed up in real time, and the economic limit oil-gas ratio OSR can be obtained more accurately. min , thereby improving the accuracy of the calculated economic limit recovery factor of the target reservoir.

[0067] As a specific embodiment of the present invention, in step S2, the oil price P o 、Daily oil production Q o and economic recovery factor ER min The relationship is:

[0068]

[0069] In the formula, C i is the average cost of injecting 1 ton of steam, r is the interest rate, R is the cost quota related to oil production, I w Q is the fixed asset investment allocated to a single well. o is the average daily oil production per well, C n is the cost related to the well network, R d is the fixed asset depreciation rate converted to the date, N is the geological reserves, and A and B are coefficients.

[0070] As a specific implementation of the present invention, in step S2, according to the oil price P o 、Daily oil production Q o and economic recovery factor ER min The method for determining the economic limit recovery factor of the target reservoir based on the relationship between the daily oil production of the target reservoir and the actual oil price is as follows: o 、Daily oil production Q o and economic recovery factor ER min The relationship between the oil price P o 、Daily oil production Q o and economic recovery factor ER min After the relationship map is drawn, according to the daily oil production of the target reservoir and the actual oil price at the oil price P o 、Daily oil production Q o and economic recovery factor ER min The above method is more intuitive and can quickly determine the economic limit recovery rate of different oil prices. o 、Different daily oil production Q o The economic recovery factor ER min height.

[0071] According to a particularly preferred embodiment of the present invention, a method for determining the economic limit recovery factor of oil reservoir steam flooding is provided, comprising the following steps:

[0072] S1. Determine the oil price P based on the principle of balance of payments o (USD / barrel), daily oil production Q o (t) and economic limit oil-gas ratio OSR min The relationship is:

[0073]

[0074] C i is the average cost of injecting 1 t of steam (yuan / t), α is the steam thermal recovery rate, r is the interest rate (%), R is the cost quota related to oil production (yuan / t), I w is the fixed asset investment allocated to a single well (yuan), C n is the cost related to the well network (yuan), R d The depreciation rate of fixed assets converted to the date.

[0075] (1) The cumulative steam injection volume N of the reservoir steam drive s and cumulative oil production N p Taking the derivative of the general relationship with respect to time t, we get the formula:

[0076]

[0077] In the formula, q s is the steam injection rate (t / d), q o is the oil production rate (t / d), B and C are coefficients;

[0078] (2) Define the instantaneous oil-steam ratio during the reservoir steam flooding stage as OSR = q o / q s , and put it into formula (I) to get the formula:

[0079]

[0080] (3) Substituting formula (II) into the cumulative steam injection volume N of steam flooding in heavy oil reservoirs s (t) and cumulative oil production N p (t) is obtained from the general formula:

[0081]

[0082] In the formula, A is the coefficient;

[0083] (4) Dividing both sides of formula (III) by geological reserves N, we can obtain the general formula for the relationship between the recovery rate ER and the oil-gas ratio OSR:

[0084]

[0085] Where N is geological reserves, A and B are coefficients;

[0086] (5) The cumulative steam injection volume N in the actual production data of the reservoir is s and cumulative oil production N p Cumulative steam injection volume N brought into the reservoir for steam flooding s and cumulative oil production N p Calculate the values ​​of A and B in the general formula, and substitute the values ​​of A and B into Formula IV to obtain the oil-gas ratio formula;

[0087] (6) Substitute formula V into formula IV to obtain the formula:

[0088] A and B are fixed values;

[0089] (7) According to the oil price P o 、Daily oil production Q o and economic recovery factor ER min The relationship between the oil price P o 、Daily oil production Q o and economic recovery factor ER min After the relationship map is drawn, according to the daily oil production of the target reservoir and the actual oil price at the oil price P o 、Daily oil production Q o and economic recovery factor ER min Find the corresponding target reservoir economic limit recovery factor from the relationship diagram.

[0090] The above preferred embodiment is used to determine the economic limit recovery factor of a heavy oil reservoir, wherein the target heavy oil reservoir is used to calculate the economic limit oil-gas ratio OSR min The values ​​of each parameter are: average per injection 1m 3 The cost of steam is 1,000 yuan, the steam thermal recovery rate is 0.82, the interest rate is 12%, the rated cost related to production is 100 yuan / t, the fixed asset investment allocated to a single well is 95,000,000 yuan, and the fixed asset depreciation rate converted to the day is 0.0004566.

[0091] According to the above parameters, the economic limit oil-gas ratio OSR is calculated by formula V when the oil production rate is 20t / d, 30t / d, 40t / d, 50t / d, and the oil price is 50 USD / barrel, 60 USD / barrel, 70 USD / barrel, 80 USD / barrel, 90 USD / barrel, and 100 USD / barrel respectively. min , the calculation results are shown in Table 1.

[0092] Table 1

[0093]

[0094] The cumulative steam injection volume N in the actual production data of the reservoir s and cumulative oil production N p Cumulative steam injection volume N brought into the reservoir for steam flooding s and cumulative oil production N p The coefficient value in the general formula of the relationship is calculated, and the regression curve of the cumulative steam injection volume and the cumulative oil production volume is fitted ( Figure 2 ), coefficient A = -0.9943, coefficient B = 0.285, and the values ​​of coefficients A and B are substituted into formula V to obtain:

[0095]

[0096] The economic limit oil-gas ratio OSR in Table 1 min Substituting into the above formula VII, the economic limit recovery factor corresponding to different oil prices and oil production rates of the target reservoir is obtained.

[0097] Establish the economic limit recovery factor chart corresponding to different oil prices and oil production rates. Figure 3 shown.

[0098] The target reservoir has an oil production rate of 28t / d and the current oil price is $75 / barrel. Figure 2 The economic limit recovery factor is 29.45%, so the economic limit recovery factor of the target reservoir is 29.45%.

[0099] The method provided in the above preferred embodiment not only provides a method for determining the economic limit recovery factor of oil reservoir steam drive, but also can quickly and accurately determine the economic limit recovery factor of oil reservoir steam drive.

[0100] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, including the combination of various technical features in any other suitable manner, and these simple modifications and combinations should also be regarded as the contents disclosed by the present invention and belong to the protection scope of the present invention.

Claims

1. A method for determining the economic limit recovery factor of oil reservoir steam flooding, characterized in that: The steps include: S1. After determining the general formula of the relationship between the recovery rate ER and the oil-gas ratio OSR, determine the oil-gas ratio relationship formula according to the actual production data of the reservoir and the general formula of the oil-gas ratio OSR; wherein, the method for determining the general formula of the relationship between the recovery rate ER and the oil-gas ratio OSR is: The cumulative steam injection volume N s and cumulative oil production N p Taking the derivative of the general relationship with respect to time t, we get the following formula: In the formula, q s is the steam injection rate, q o is the oil production rate, B and C are coefficients; The instantaneous oil-steam ratio during the steam flooding phase of the reservoir is defined as OSR = q o / q s , and put it into formula (I) to get the formula: Substituting formula (II) into the cumulative steam injection volume N of steam flooding in heavy oil reservoirs s and cumulative oil production N p The formula is obtained from the general formula of the relationship: In the formula, A is the coefficient; Dividing both sides of the formula (III) by the geological reserves N, we can obtain the general formula for the relationship between the recovery rate ER and the oil-gas ratio OSR: In the formula, N is geological reserves, A and B are coefficients; the cumulative steam injection volume Ns and the cumulative oil production Np in the actual production data of the reservoir are substituted into the relationship between the cumulative steam injection volume Ns and the cumulative oil production Np of the reservoir steam drive and the values ​​of A and B in the relationship are calculated, and the values ​​of A and B are substituted into Formula IV to obtain the oil-steam ratio relationship; Determine the oil price P o 、Daily oil production Q o and economic limit oil-gas ratio OSR min and calculate different oil prices P o And different daily oil production Q o The corresponding economic limit oil-gas ratio OSR min ; Specifically: Based on the sales revenue of crude oil = cost = oil production related costs + well related costs + steam injection costs, the formula is: In the formula, OSRmin is the economic limit oil-steam ratio, Po is the oil price, Qo is the daily oil production, Ci is the average cost of injecting 1 t of steam, α is the steam thermal recovery time rate, r is the interest rate, R is the cost quota related to oil production, Iw is the fixed asset investment allocated to a single well, Cn is the cost related to the well network, and Rd is the fixed asset depreciation rate converted to the day; S2, according to the economic limit oil-gas ratio OSR min The oil price P is determined by the oil-gas ratio relationship o 、Daily oil production Q o and economic recovery factor ER min Specifically, substituting formula (V) into formula (VI) yields the formula S3, according to the oil price P o 、Daily oil production Q o and economic recovery factor ER min Specifically, after fitting the relationship map of oil price Po, daily oil production Qo and economic limit recovery factor ERmin according to the relationship formula of oil price Po, daily oil production Qo and economic limit recovery factor ERmin, find the corresponding economic limit recovery factor of the target oil reservoir in the relationship map of oil price Po, daily oil production Qo and economic limit recovery factor ERmin according to the daily oil production of the target oil reservoir and the actual oil price.

Images