CN106639995A - Water-drive reservoir crude oil recovery rate prediction method - Google Patents
Water-drive reservoir crude oil recovery rate prediction method Download PDFInfo
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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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
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Abstract
The invention provides a method for predicting the crude oil recovery ratio of a water-drive reservoir, which comprises the following steps: dividing the oil field production history into a plurality of development stages according to data point forms of accumulated water and accumulated oil of an actual oil field after the accumulated water and the accumulated oil are distributed according to a type A water drive characteristic curve; respectively establishing a relational expression comprising the water content and the extraction degree of production parameters of corresponding development stages, wherein the production parameters of the corresponding development stages comprise initial water content, initial extraction degree, economic limit water content and predicted crude oil recovery under the condition of the economic limit water content; and predicting the crude oil recovery ratio according to the relational expression of the water content and the extraction degree in each development stage. The method for predicting the crude oil recovery rate of the water-drive oil reservoir can reflect the change conditions of the water content and the extraction degree in each development stage more reasonably, so that the crude oil recovery rate is effectively predicted.
Description
Technical field
The invention belongs to oil reservoir production technique field, and in particular to a kind of water-drive pool oil recovery factor Forecasting Methodology.
Background technology
During oil reservoir development, oil reservoir moisture percentage is to evaluate the pass of effect of reservoir development with the relation of oily recovery percent of reserves
Key, the actual curve with oily recovery percent of reserves and theoretical curve contrast by oil reservoir moisture percentage, can evaluate oil reservoir in different exploitation ranks
The moisture content of section rises rule and Developing status, reflects that oil reservoir plays the degree of potentiality to be exploited, therefore, obtain accurately and reliably oil
The relation that moisture content is hidden with oily recovery percent of reserves is for the Exploitation degree for evaluating oil reservoir is considerable.At present, oil reservoir moisture percentage
Mainly have following several with the relational expression of oily recovery percent of reserves：
1) virgin charter. oil well occurrence and reservoir performance analysis [M]. petroleum industry publishing house, 1981, P37-41.
The method sets up moisture content with extraction journey based on B-mode WATER DISPLACEMENT CURVES and the data of domestic and international 25 middle and high infiltration oil reservoirs
Degree relational expression：
In formula：fwFor oil reservoir moisture percentage, f；R be oil reservoir produced degree, f；RmFor oil reservoir ultimate recovery, f.Using above formula
Moisture content and recovery percent of reserves relation curve plate under the difference ultimate recovery of middle and high infiltration oil field can be drawn.
2) Chen Yuanqian. the derivation [J] of WATER DISPLACEMENT CURVES relational expression. petroleum journal, 1985,6 (2):69-78.
Displacement theory and experimental research achievements of the method based on water-oil phase, has approx derived moisture content with extraction journey
Spending relational expression is：
Wherein：B=3mSoi/4.606
In formula：fwFor oil reservoir moisture percentage, f；R be oil reservoir produced degree, f；μo,μwRespectively oil, water viscosity, mPas；
Bo,BwRespectively oil, water volume coefficient, decimal；γo,γwRespectively oil, the proportion of water, kg/m3；M, n are and rock and fluid
Relevant constant, decimal；SwiFor irreducible water water saturation, decimal；SoiFor oil saturation under reset condition, decimal；SorFor
Residual oil saturation, decimal.
The method points out that after Cut of Oilfield reaches certain value water-oil factor is with recovery percent of reserves in semilog axle system
Relation in line.
3) Yin great Qing, Lin Dongwei, red legend ripple, etc. water drive sandstone reservoirs amendment Tong's chart hydrated comples ion method [J].
Grand celebration petroleum geology and exploitation, 2014,2 (33)：54-57.
The actual oilfield production data of the method cannot be by the whole recovery percent of reserves of exploitation and moisture content spread in a plate
On, based on Tong Shi relational expressions, propose the formula of a moisture content and recovery percent of reserves, then by the creation data in actual oil field according to
Formula carries out regression fit and obtains corresponding parameter, so that it is determined that actual Cut of Oilfield predicts oil with recovery percent of reserves relational expression
The ultimate recovery in field, its formula is
In formula：fwFor oil reservoir moisture percentage, f；R be oil reservoir produced degree, f；RmFor oil reservoir ultimate recovery, f；A is constant.
At present existing moisture content and recovery percent of reserves relation curve plate, are primarily present following two problems, and one is aqueous
Constant in the relational expression of rate and recovery percent of reserves is definite value, this and it is actual be not obviously inconsistent because different oil fields not only reservoir conditions
It is not quite similar, and development scheme also varies；Two is that the plate formula of amendment will be simply in Tong's chart relational expression
Number 7.5 or 1.96 is artificially revised as other constants, to meet the actual water drive law in goals research region, lacks versatility and reality
The property used.
The content of the invention
To solve the above problems, it is an object of the invention to provide a kind of water-drive pool oil recovery factor Forecasting Methodology.
To reach above-mentioned purpose, the invention provides a kind of water-drive pool oil recovery factor Forecasting Methodology, the method includes
Following steps：
Data point form after being distributed according to A type WATER FLOODING CHARACTERISTIC CURVE according to the tired product water and tired oil-producing in actual oil field, will
Oil field production history is divided into some development phases；
The relational expression comprising the corresponding moisture content and recovery percent of reserves for sending out stage manufacturing parameter, the corresponding exploitation are set up respectively
Stage manufacturing parameter includes initial stage moisture content, initial stage recovery percent of reserves, eco-technical comparison and eco-technical comparison condition
Under OIL RECOVERY FACTORS ESTIMATED；
According to each development phase moisture content and the relational expression OIL RECOVERY FACTORS ESTIMATED of recovery percent of reserves.
WATER DISPLACEMENT CURVES is the indicatrix of water-drive pool, can not only predict that the exploitation of water-drive pool is moved using WATER DISPLACEMENT CURVES
State, but also the recoverable reserves and recovery ratio of measurable water-drive pool, are at home and abroad widely used to the water drive of water controlled field
Development response evaluation.During water filling or natural edge-bottom water develop oil fields, water body constantly advances crude oil toward shaft bottom, in oil reservoir
Oil saturation is reduced with the increase of water saturation, aqueous full at oil well after water saturation reaches certain value
It is more than irreducible water saturation, oil well water breakthrough with degree, moisture content starts increase, and moisture content and water saturation into certain relation
Formula.The curve plate under different recovery ratios can be drawn according to moisture content and the theory relation of recovery percent of reserves, oil field is actual raw
Product data are plotted to theoretical plate and are matched, so as to the development effectiveness for analyzing oil field and guides the modification scenario in future, therefore
Rational WATER FLOODING CHARACTERISTIC CURVE relational expression and plate are only set up, could more preferable analysis and guidance oil field Efficient Development.For this purpose, this
Invention is based on oil field actual production data, is some development phases first by oil field production history classifying rationally, has then set up
Moisture content comprising corresponding development phase manufacturing parameter and the relational expression moisture content of recovery percent of reserves and the total relation of recovery percent of reserves
Formula, the relational expression includes initial stage moisture content, initial stage recovery percent of reserves, eco-technical comparison and eco-technical comparison condition
Under OIL RECOVERY FACTORS ESTIMATED, therefore, it is possible to more reasonably reflect the change conditions of each development phase moisture content and recovery percent of reserves,
So as to effective OIL RECOVERY FACTORS ESTIMATED.
In above-mentioned water-drive pool oil recovery factor Forecasting Methodology, it is preferable that the tired product water according to actual oil field and
Oil field production history is divided into some development phases by tired oil-producing according to the data point form after the distribution of A type WATER FLOODING CHARACTERISTIC CURVE
The step of specifically include：
The tired product water and tired oil-producing in actual oil field are drawn in a coordinate system according to A type WATER FLOODING CHARACTERISTIC CURVE relational expression,
Oil field production history is divided into by several development phases according to data point form.
In above-mentioned water-drive pool oil recovery factor Forecasting Methodology, it is preferable that comprising corresponding development phase manufacturing parameter
Moisture content is specially with the relational expression of recovery percent of reserves：
In above-mentioned formula 1, fwiFor the moisture content in the i-th stage, f；RiFor the crude oil recovery percent of reserves in the i-th stage, f；fwLFor
Eco-technical comparison, f；ERiFor the OIL RECOVERY FACTORS ESTIMATED under the conditions of the i-th stage eco-technical comparison, f；R0iFor the i-th rank
The initial stage recovery percent of reserves of section, f；fw0iFor the initial stage moisture content in the i-th stage, f.
In above-mentioned water-drive pool oil recovery factor Forecasting Methodology, it is preferable that the process for deriving the formula 1 is：
Build the tired product water of corresponding development phase and the relational expression of tired oil-producing；
The shunt volume of water during by introducing oil in place, water and the yield of oil and relational expression, the water-oil phase of tired product
Relational expression, builds the original equation of moisture content and recovery percent of reserves；
On the basis of the original equation of the moisture content and recovery percent of reserves, eco-technical comparison and economic limit are built
The relational expression of the OIL RECOVERY FACTORS ESTIMATED under moisture content, and the relational expression of initial stage moisture content and initial stage crude oil recovery percent of reserves；
Comprehensively under the original equation of the moisture content and recovery percent of reserves, eco-technical comparison and eco-technical comparison
The relational expression of the relational expression, initial stage moisture content and initial stage crude oil recovery percent of reserves of OIL RECOVERY FACTORS ESTIMATED, obtains comprising corresponding exploitation
The moisture content of stage manufacturing parameter and the relational expression of recovery percent of reserves.
In above-mentioned water-drive pool oil recovery factor Forecasting Methodology, it is preferable that the tired product water of corresponding development phase and tired product
Oil relational expression be：
log(Wpi)=ai+biNpiI=1,2,3 ..., N (formula 2),
In above-mentioned formula 2：WpiIt is the accumulative product water by the end of the i-th stage, ten thousand tons；NpiIt is tiring out by the end of the i-th stage
Meter oil-producing, ten thousand tons；aiAnd biFor constant.
In above-mentioned water-drive pool oil recovery factor Forecasting Methodology, it is preferable that described to implement by introducing oil in place, water
With the shunt volume relational expression of water during relational expression, water-oil phase of the oily yield with tired product, moisture content and recovery percent of reserves are built
Original equation the step of specifically include：
1. formula 2 is introduced into oil in place NoAnd it is transformed after obtain：
log(Rwi)=ai'+bi'Ri(formula 3),
In above-mentioned formula 3：RiFor the crude oil recovery percent of reserves in the i-th stage, f；Rwi=Wpi/No；ai'=ai-log(No)；
bi'=biNo；
2. obtained by yield and tired relational expression of producing：
In above-mentioned formula 4：QwiFor produce per year water, ten thousand tons/year；QoiFor year oil-producing, ten thousand tons/year；
3. the flow rate equations of water are during water-oil phase：
In above-mentioned formula 5：fwiFor the moisture content in the i-th stage, f；
4. by formula 3 with regard to the derivation of time t, and simultaneous formula 4 and formula 5 obtain the moisture content and recovery percent of reserves in the i-th stage
Relational expression is：
In above-mentioned formula 6：C is constant, c=ln (10).
In above-mentioned water-drive pool oil recovery factor Forecasting Methodology, it is preferable that the synthesis moisture content and extraction journey
The relational expression of the OIL RECOVERY FACTORS ESTIMATED under the original equation of degree, eco-technical comparison and eco-technical comparison, initial stage contain
Water rate and the relational expression of initial stage crude oil recovery percent of reserves, obtain the moisture content comprising corresponding development phase manufacturing parameter and recovery percent of reserves
Relational expression the step of specifically include：
1. when moisture content takes eco-technical comparison fwLWhen, the expression formula of recovery ratio is obtained by formula 6：
In above-mentioned formula 7：ERiFor the OIL RECOVERY FACTORS ESTIMATED under the conditions of the i-th stage eco-technical comparison, f；
2. the recovery percent of reserves at initial stage the i-th stage of oil field is set as R0iWhen corresponding moisture content be fw0i, obtained by formula 6：
In above-mentioned formula 8：fw0iFor the initial stage moisture content in the i-th stage, f；R0iFor the initial stage recovery percent of reserves in the i-th stage, f；
3. formula 7 and formula 8 are substituted into formula 6, eliminates intermediate variable and obtain comprising corresponding development phase manufacturing parameter
The relational expression of moisture content and recovery percent of reserves, i.e., described formula 1.
In above-mentioned water-drive pool oil recovery factor Forecasting Methodology, it is preferable that it is described according to each development phase moisture content with
The step of relational expression OIL RECOVERY FACTORS ESTIMATED of recovery percent of reserves, specifically includes：
WATER FLOODING CHARACTERISTIC CURVE plate is drawn using formula 1, according to WATER FLOODING CHARACTERISTIC CURVE plate OIL RECOVERY FACTORS ESTIMATED.
In above-mentioned water-drive pool oil recovery factor Forecasting Methodology, it is preferable that initial stage moisture content and initial stage recovery percent of reserves are not
When knowing, according to the actual production data of oil field different development phases, the initial of different development phases Water-flooding characteristics relational expression is determined
Value.Preferably, initial stage moisture content and initial stage recovery percent of reserves can by the following method be determined：(1) with recovery percent of reserves as abscissa, with
Moisture content is ordinate, and the stage of oil field i-th actual moisture content and recovery percent of reserves data point are drawn in a coordinate system；(2) base
In the data point that step (1) is obtained, then according to formula 1 carries out regression fit to actual data point so as to obtain meeting actual oil
The WATER DISPLACEMENT CURVES in field, according to matched curve the initial stage moisture content and initial stage recovery percent of reserves in actual oil field are determined.On this basis, paint
The step of WATER FLOODING CHARACTERISTIC CURVE plate processed can be：The matched curve that the step (2) is obtained takes different as datum line
Recovery ratio value, obtains the moisture content and recovery percent of reserves relation curve plate under different ultimate recoveries；Different development phase weights
Multiple step (1) and step (2), obtain the WATER FLOODING CHARACTERISTIC CURVE of oil field difference production phase.
The water-drive pool oil recovery factor Forecasting Methodology that the present invention is provided, establishes water cut in water flooding reservoir and recovery percent of reserves
The Formula of relation, and with reference to actual production data, the WATER FLOODING CHARACTERISTIC CURVE for more meeting actual oil field can be drawn, accordingly, it is capable to
The actual oilfield water flooding characteristic rule of more accurate interpretive analysis and prediction oil field future development index.
Description of the drawings
Fig. 1 is the moisture content of the first development phase obtained using the inventive method in embodiment 1 and oily recovery percent of reserves
Relation curve plate；
Fig. 2 is the moisture content of the second development phase obtained using the inventive method in embodiment 1 and oily recovery percent of reserves
Relation curve plate；
Fig. 3 is Tong Shi moisture content and oily recovery percent of reserves Core analysis.
Specific embodiment
In order to be more clearly understood to the technical characteristic of the present invention, purpose and beneficial effect, now to the skill of the present invention
Art scheme carry out it is described further below, but it is not intended that to the present invention can practical range restriction.
Embodiment 1
A kind of water-drive pool oil recovery factor Forecasting Methodology is present embodiments provided, the method is comprised the following steps：
Step one, according to the tired product water and tired oil-producing in actual oil field according to the data point after the distribution of A type WATER FLOODING CHARACTERISTIC CURVE
Form, by oil field production history some development phases are divided into；Detailed process is：
The tired product water and tired oil-producing in actual oil field are drawn in a coordinate system according to A type WATER FLOODING CHARACTERISTIC CURVE relational expression,
Oil field production history is divided into by several development phases according to data point form.The tired product water and tired oil-producing of corresponding development phase
Relational expression be：
log(Wpi)=ai+biNpiI=1,2,3 ..., N (formula 2),
In above-mentioned formula 2：WpiIt is the accumulative product water by the end of the i-th stage, ten thousand tons；NpiIt is tiring out by the end of the i-th stage
Meter oil-producing, ten thousand tons；aiAnd biFor constant.
The relational expression of step 2, respectively foundation comprising the corresponding moisture content and recovery percent of reserves for sending out stage manufacturing parameter, it is described
Corresponding development phase manufacturing parameter contains including initial stage moisture content, initial stage recovery percent of reserves, eco-technical comparison and economic limit
OIL RECOVERY FACTORS ESTIMATED under the conditions of water rate；Detailed process is：
1. formula 2 is introduced into oil in place NoAnd it is transformed after obtain：
log(Rwi)=ai'+bi'Ri(formula 3),
In above-mentioned formula 3：RiFor the crude oil recovery percent of reserves in the i-th stage, f；Rwi=Wpi/No；ai'=ai-log(No)；
bi'=biNo；
2. obtained by yield and tired relational expression of producing：
In above-mentioned formula 4：QwiFor produce per year water, ten thousand tons/year；QoiFor year oil-producing, ten thousand tons/year；
3. the flow rate equations of water are during water-oil phase：
In above-mentioned formula 5：fwiFor the moisture content in the i-th stage, f；
4. by formula 3 with regard to the derivation of time t, and simultaneous formula 4 and formula 5 obtain the moisture content and recovery percent of reserves in the i-th stage
Relational expression is：
In above-mentioned formula 6：C is constant, c=ln (10).
5. when moisture content takes eco-technical comparison fwLWhen, the expression formula of recovery ratio is obtained by formula 6：
In above-mentioned formula 7：ERiFor the OIL RECOVERY FACTORS ESTIMATED under the conditions of the i-th stage eco-technical comparison, f；
6. the recovery percent of reserves at initial stage the i-th stage of oil field is set as R0iWhen corresponding moisture content be fw0i, obtained by formula 6：
In above-mentioned formula 8：fw0iFor the initial stage moisture content in the i-th stage, f；R0iFor the initial stage recovery percent of reserves in the i-th stage, f；
7. formula 7 and formula 8 are substituted into formula 6, eliminates intermediate variable and obtain comprising corresponding development phase manufacturing parameter
The relational expression of moisture content and recovery percent of reserves, i.e. formula 1：
In above-mentioned formula 1, fwiFor the moisture content in the i-th stage, f；RiFor the crude oil recovery percent of reserves in the i-th stage, f；fwLFor
Eco-technical comparison, f；ERiFor the OIL RECOVERY FACTORS ESTIMATED under the conditions of the i-th stage eco-technical comparison, f；R0iFor the i-th rank
The initial stage recovery percent of reserves of section, f；fw0iFor the initial stage moisture content in the i-th stage, f.
Step 3, according to the relational expression OIL RECOVERY FACTORS ESTIMATED of each development phase moisture content and recovery percent of reserves；Detailed process
For：
(1) with recovery percent of reserves as abscissa, with moisture content as ordinate, by the stage of oil field i-th actual moisture content and extraction
Level data point-rendering is in a coordinate system；
(2) data point obtained based on step (1), then according to formula 1 regression fit is carried out to actual data point so as to
Obtain meeting the WATER DISPLACEMENT CURVES in actual oil field, the R in actual oil field is determined according to matched curve0iAnd fw0i, while matched curve is made
On the basis of line, take different recovery ratio values, obtain moisture content new under different ultimate recoveries and recovery percent of reserves relation curve
Plate；
(3) different development phase repeat step (1) and step (2), obtain the Water-flooding characteristics of oil field difference production phase
Curve.
The present embodiment is also by the relation curve plate of the moisture content obtained using said method and oily recovery percent of reserves and utilization
The moisture content and the relation curve plate of oily recovery percent of reserves that art methods are obtained is contrasted.Wherein, for oil reservoir A, Fig. 1
It is the moisture content of the first development phase obtained using the present embodiment method and the relation curve plate of oily recovery percent of reserves；Fig. 1 is
The relation curve plate of the moisture content of the second development phase obtained using the present embodiment method and oily recovery percent of reserves；Fig. 3 is child
Family name's moisture content and oily recovery percent of reserves Core analysis.By Fig. 1, Fig. 2 and Fig. 3 contrast, it can be seen that Tong Shi curve plates all can not be very
Water flooding effectiveness analysis for there are multiple production phase oil fields well, it is impossible to following moisture content in rational prediction oil field
And ultimate recovery, and utilize the plate (Fig. 2 and Fig. 3) that the present embodiment method is drawn preferably to explain that oilfield water flooding exploitation is special
Levy and predict the final waterflood recovery efficiency factor under the corresponding mining type in oil field.
Claims (10)
1. a kind of water-drive pool oil recovery factor Forecasting Methodology, it is characterised in that the method is comprised the following steps：
Data point form after being distributed according to A type WATER FLOODING CHARACTERISTIC CURVE according to the tired product water and tired oil-producing in actual oil field, by oil field
Production history is divided into some development phases；
The relational expression comprising the corresponding moisture content and recovery percent of reserves for sending out stage manufacturing parameter, the corresponding development phase are set up respectively
Manufacturing parameter is included under the conditions of initial stage moisture content, initial stage recovery percent of reserves, eco-technical comparison and eco-technical comparison
OIL RECOVERY FACTORS ESTIMATED；
According to each development phase moisture content and the relational expression OIL RECOVERY FACTORS ESTIMATED of recovery percent of reserves.
2. water-drive pool oil recovery factor Forecasting Methodology according to claim 1, it is characterised in that described according to actual oil
The tired product water and tired oil-producing in field is divided into oil field production history according to the data point form after the distribution of A type WATER FLOODING CHARACTERISTIC CURVE
The step of some development phases, specifically includes：
By the tired product water and tired oil-producing in actual oil field according to A type WATER FLOODING CHARACTERISTIC CURVE relational expression draw in a coordinate system, according to
Oil field production history is divided into several development phases by data point form.
3. water-drive pool oil recovery factor Forecasting Methodology according to claim 2, it is characterised in that comprising corresponding exploitation rank
The section moisture content of manufacturing parameter is specially with the relational expression of recovery percent of reserves：
In above-mentioned formula 1, fwiFor the moisture content in the i-th stage, f；RiFor the crude oil recovery percent of reserves in the i-th stage, f；fwLFor economy
Water cut limit, f；ERiFor the OIL RECOVERY FACTORS ESTIMATED under the conditions of the i-th stage eco-technical comparison, f；R0iFor the i-th stage
Initial stage recovery percent of reserves, f；fw0iFor the initial stage moisture content in the i-th stage, f.
4. water-drive pool oil recovery factor Forecasting Methodology according to claim 3, it is characterised in that the formula 1 is logical
Cross what procedure below was obtained：
Build the tired product water of corresponding development phase and the relational expression of tired oil-producing；
The shunting magnitude relation of water during by introducing oil in place, water and the yield of oil and relational expression, the water-oil phase of tired product
Formula, builds the original equation of moisture content and recovery percent of reserves；
On the basis of the original equation of the moisture content and recovery percent of reserves, eco-technical comparison and economic limit implication are built
The relational expression of the OIL RECOVERY FACTORS ESTIMATED under rate, and the relational expression of initial stage moisture content and initial stage crude oil recovery percent of reserves；
The comprehensively prediction under the original equation of the moisture content and recovery percent of reserves, eco-technical comparison and eco-technical comparison
The relational expression of the relational expression, initial stage moisture content and initial stage crude oil recovery percent of reserves of oil recovery factor, obtained comprising the corresponding development phase
The moisture content of manufacturing parameter and the relational expression of recovery percent of reserves.
5. water-drive pool oil recovery factor Forecasting Methodology according to claim 4, it is characterised in that
The corresponding tired product water of development phase and the relational expression of tired oil-producing are：
log(Wpi)=ai+biNpiI=1,2,3 ..., N (formula 2),
In above-mentioned formula 2：WpiIt is the accumulative product water by the end of the i-th stage, ten thousand tons；NpiIt is the accumulative product by the end of the i-th stage
Oil, ten thousand tons；aiAnd biFor constant.
6. water-drive pool oil recovery factor Forecasting Methodology according to claim 5, it is characterised in that the enforcement is by drawing
Enter the shunt volume relational expression of water during the yield of oil in place, water and oil and relational expression, the water-oil phase of tired product, build aqueous
The step of original equation of rate and recovery percent of reserves, specifically includes：
1. formula 2 is introduced into oil in place NoAnd it is transformed after obtain：
log(Rwi)=a 'i+b′iRi(formula 3),
In above-mentioned formula 3：RiFor the crude oil recovery percent of reserves in the i-th stage, f；Rwi=Wpi/No；a′i=ai-log(No)；b′i=
biNo；
2. obtained by yield and tired relational expression of producing：
In above-mentioned formula 4：QwiFor produce per year water, ten thousand tons/year；QoiFor year oil-producing, ten thousand tons/year；
3. the flow rate equations of water are during water-oil phase：
In above-mentioned formula 5：fwiFor the moisture content in the i-th stage, f；
4. by formula 3 with regard to the derivation of time t, and simultaneous formula 4 and formula 5 obtain the moisture content and recovery percent of reserves relation in the i-th stage
Formula is：
In above-mentioned formula 6：C is constant, c=ln (10).
7. water-drive pool oil recovery factor Forecasting Methodology according to claim 5, it is characterised in that contain described in the synthesis
The pass of the OIL RECOVERY FACTORS ESTIMATED under the original equation of water rate and recovery percent of reserves, eco-technical comparison and eco-technical comparison
It is the relational expression of formula, initial stage moisture content and initial stage crude oil recovery percent of reserves, obtains aqueous comprising corresponding development phase manufacturing parameter
The step of relational expression of rate and recovery percent of reserves, specifically includes：
1. when moisture content takes eco-technical comparison fwLWhen, the expression formula of recovery ratio is obtained by formula 6：
In above-mentioned formula 7：ERiFor the OIL RECOVERY FACTORS ESTIMATED under the conditions of the i-th stage eco-technical comparison, f；
2. the recovery percent of reserves at initial stage the i-th stage of oil field is set as R0iWhen corresponding moisture content be fw0i, obtained by formula 6：
In above-mentioned formula 8：fw0iFor the initial stage moisture content in the i-th stage, f；R0iFor the initial stage recovery percent of reserves in the i-th stage, f；
3. formula 7 and formula 8 are substituted into formula 6, eliminates intermediate variable and obtain aqueous comprising corresponding development phase manufacturing parameter
The relational expression of rate and recovery percent of reserves, i.e., described formula 1.
8. water-drive pool oil recovery factor Forecasting Methodology according to claim 3, it is characterised in that described according to each exploitation
The step of relational expression OIL RECOVERY FACTORS ESTIMATED of stage moisture content and recovery percent of reserves, specifically includes：
WATER FLOODING CHARACTERISTIC CURVE plate is drawn using formula 1, according to WATER FLOODING CHARACTERISTIC CURVE plate OIL RECOVERY FACTORS ESTIMATED.
9. the water-drive pool oil recovery factor Forecasting Methodology according to any one of claim 1-8, it is characterised in that the initial stage contains
When water rate and unknown initial stage recovery percent of reserves, according to the actual production data of oil field different development phases, different development phases are determined
The initial value of Water-flooding characteristics relational expression；
Preferably, initial stage moisture content and initial stage recovery percent of reserves are determined by the following method：
(1) with recovery percent of reserves as abscissa, with moisture content as ordinate, by the stage of oil field i-th actual moisture content and recovery percent of reserves
Data point is drawn in a coordinate system；
(2) data point obtained based on step (1), then according to formula 1 carries out regression fit so as to obtain to actual data point
Meet the WATER DISPLACEMENT CURVES in actual oil field, the initial stage moisture content and initial stage recovery percent of reserves in actual oil field are determined according to matched curve.
10. water-drive pool oil recovery factor Forecasting Methodology according to claim 9, it is characterised in that the utilization formula 1
The step of drawing WATER FLOODING CHARACTERISTIC CURVE plate specifically includes：
The matched curve that the step (2) is obtained takes different recovery ratio values as datum line, obtains different ultimate recoveries
Under moisture content and recovery percent of reserves relation curve plate；
Different development phase repeat step (1) and step (2), obtain the WATER FLOODING CHARACTERISTIC CURVE of oil field difference production phase.
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