CN105160146B - Water-flooding characteristics relationship plate generation method and device - Google Patents
Water-flooding characteristics relationship plate generation method and device Download PDFInfo
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Abstract
The present invention provides a kind of Water-flooding characteristics relationship plate generation method and device, the Water-flooding characteristics relationship plate generation method includes：Oil saturation under acquisition oil viscosity, water viscosity, oil reservoir production fluid moisture content, residual oil saturation, irreducible water water saturation and reset condition；The relational expression of oil reservoir production fluid moisture content is established according to the oil viscosity, water viscosity and residual oil saturation；The expression formula of exit-end water saturation and average water saturation is acquired for theoretical and Welge equations according to Buckley Leverett water drives；It differentiates to the oil reservoir production fluid moisture content, obtains the differential equation；Solution obtains the Formula of water cut in water flooding reservoir and recovery percent of reserves relationship；Water-flooding characteristics relationship plate is drawn according to the relation value for calculating oil reservoir production fluid moisture content and recovery percent of reserves in the Formula, and according to the relation value.
Description
Technical field
The present invention relates to the oil reservoir engineering methods of oil field development, are given birth to especially with regard to a kind of Water-flooding characteristics relationship plate
At method and device.
Background technology
WATER DISPLACEMENT CURVES is the indicatrix of water-drive pool, can not only predict that the exploitation of water-drive pool is dynamic using WATER DISPLACEMENT CURVES
State, but also the recoverable reserves and recovery ratio of predictable water-drive pool, are at home and abroad widely used to the water drive of water controlled field
Development response evaluation.In the prior art, there are many kinds of the methods for calculating moisture content and recovery percent of reserves relationship, is illustrated below：
1)Welge H J.A simplified method for computing oil recovery by gas or
Water drive [J] .Trans., AIME, 1952,195:91-98.
This method is based on Darcy's law and conservation of matter principle, has derived and has averagely contained water saturation in one-dimensional linear displacement system
Degree and exit-end water saturation relational expression：
In formula：For average water saturation in oil reservoir；SwFor the water saturation at oil well in oil reservoir；fwIt is produced for oil reservoir
Go out liquid moisture content；fw' it is derivative of the moisture content about water saturation.
2) virgin charter oil wells occurrence and reservoir performance analysis [M] petroleum industries publishing house, 1981, P37-41.
This method is based on B-mode WATER DISPLACEMENT CURVES and domestic and international 25 Reservoir Datas, establishes moisture content and recovery percent of reserves relationship
Formula：
Relational expression (2) is known as Tong Shi Water-flooding characteristics relational expressions, in formula：F is oil reservoir moisture percentage；R is oil reservoir produced degree；Rm
For oil reservoir ultimate recovery.Moisture content and recovery percent of reserves graph of relation under the difference ultimate recovery of oil field can be drawn using above formula
Version, as shown in Figure 1.
3) derivation [J] petroleum journals of thousand, WATER DISPLACEMENT CURVES relational expressions of Chen Yuan, 1985,6 (2):69-78.
Displacement theory and experimental research achievements of this method based on water-oil phase, have approximatively derived moisture content and extraction journey
Spending relational expression is：
Wherein：B=3mSoi/4.606
In formula：F is oil reservoir moisture percentage；R is oil reservoir produced degree；μo,μwRespectively oil, water viscosity, mPas；Bo,BwPoint
It Wei not oil, water volume coefficient；γo,γwThe respectively proportion of oil, water, kg/m3；M, n are constant related with rock and fluid；
SwiFor irreducible water water saturation；SoiFor oil saturation under reset condition；SorFor residual oil saturation.
This method points out that after Cut of Oilfield reaches certain value, water-oil factor is with recovery percent of reserves in semilog axle system
Relationship in line.
Existing moisture content and recovery percent of reserves relation curve plate, are primarily present following two problems, first, Water-flooding characteristics
There is no to embody the recovery percent of reserves of water-free oil production period crude oil on curve or moisture content to reach certain value after be just applicable in, this and water drive
Curve is that the intrinsic indicatrix of water-drive pool contradicts；Second is that by Tong Shi Water-flooding characteristics relational expression (2) coefficient 7.5 or
1.96 are artificially revised as other constants, to meet the practical water drive law in goals research region, lack theoretical property and versatility；Three
Be water drive relational expression theory deduction during consider more empirical value or approximation, for practical oil field degree of fitting compared with
Difference cannot reasonably analyze the waterflooding development feature and effect in oil field.
Invention content
A kind of Water-flooding characteristics relationship plate generation method of present invention offer and device, actual production data in oil field are drawn
On to theoretical plate compare and then analyzes water flooding effectiveness.
To achieve the goals above, the embodiment of the present invention provides a kind of Water-flooding characteristics relationship plate generation method, described
Water-flooding characteristics relationship plate generation method includes：
Obtain oil viscosity μo, water viscosity, muw, oil reservoir production fluid moisture content fw, residual oil saturation Sor, irreducible water contain water saturation
Spend SwiAnd oil saturation S under reset conditionoi；
According to the oil viscosity μo, water viscosity, muwAnd residual oil saturation SorEstablish oil reservoir production fluid moisture content fwRelationship
Formula：
According to Buckley-Leverett water drives exit-end water saturation S is acquired for theoretical and Welge equationsweWith it is average
Water saturationExpression formula：
Wherein,
To the oil reservoir production fluid moisture content fwIt differentiates, obtains the differential equation：
The Formula of oil reservoir production fluid moisture content and recovery percent of reserves relationship is obtained according to formula (1) to (4) solution：
According to the relation value for calculating oil reservoir production fluid moisture content and recovery percent of reserves in the Formula, and according to the pass
Set occurrence draws Water-flooding characteristics relationship plate；
Wherein, SweExpression formula for exit-end water saturation, constant C is：
In one embodiment, according to the oil viscosity μo, water viscosity, muw, exit-end water saturation SweAnd residual oil saturation
Spend SorEstablish oil reservoir production fluid moisture content fwRelational expression, including：When underground grease viscosity is between 1~10, according to
The oil viscosity μo, water viscosity, muw, exit-end water saturation SweAnd residual oil saturation SorEstablish oil reservoir production fluid moisture content
fwRelational expression.
In one embodiment, to acquire outlet end according to Buckley-Leverett water drives for theoretical and Welge equations aqueous
Saturation degree SwWith average water saturationExpression formula, including：Under the conditions of non-piston type water drive oil, according to Buckley-
Leverett water drives acquire exit-end water saturation S for theoretical and Welge equationswWith the expression formula of average water saturation.
In one embodiment, average water saturation is calculated according to the principle of mass conservation
To achieve the goals above, the embodiment of the present invention provides a kind of Water-flooding characteristics relationship plate generating means, described
Water-flooding characteristics relationship plate generating means include：
Parameter acquiring unit, for obtaining oil viscosity μo, water viscosity, muw, oil reservoir production fluid moisture content fw, residual oil saturation
Sor, irreducible water water saturation Swi, oil saturation S under oil reservoir produced degree R and reset conditionoi；
Moisture content relation reality unit, for according to the oil viscosity μo, water viscosity, muwAnd residual oil saturation SorIt builds
Vertical oil reservoir production fluid moisture content fwRelational expression：
Saturation computation unit, for acquiring outlet according to Buckley-Leverett water drives for theoretical and Welge equations
Hold water saturation SweWith average water saturationExpression formula：
Wherein,
It differentiates unit, for the oil reservoir production fluid moisture content fwIt differentiates, obtains the differential equation：
Formula solves unit, for obtaining oil reservoir production fluid moisture content and recovery percent of reserves according to formula (1) to (4) solution
The Formula of relationship：
Plate drawing unit, for according to the pass for calculating oil reservoir production fluid moisture content and recovery percent of reserves in the Formula
Set occurrence, and Water-flooding characteristics relationship plate is drawn according to the relation value；
Wherein, SweExpression formula for exit-end water saturation, constant C is：
In one embodiment, the moisture content relation reality unit is specifically used for：When underground grease viscosity between 1~
When between 10, according to the oil viscosity μo, water viscosity, muw, exit-end water saturation SweAnd residual oil saturation SorEstablish oil reservoir
Production fluid moisture content fwRelational expression.
In one embodiment, the saturation computation unit is specifically used for：Under the conditions of non-piston type water drive oil, according to
Buckley-Leverett water drives acquire exit-end water saturation S for theoretical and Welge equationswWith average water saturation
Expression formula.
In one embodiment, saturation computation unit is additionally operable to calculate average water saturation according to the principle of mass conservation
The present invention reduces empirical equation and close using the analytic expression of differential equation theory deduction moisture content and recovery percent of reserves
The error brought like value.According to practical oil field phase percolation curve data, different first boundary conditions is determined, to utilize differential side
Journey general solution determines the Water-flooding characteristics plate in oil field.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
Obtain other attached drawings according to these attached drawings.
Fig. 1 is traditional Tong Shi WATER FLOODING CHARACTERISTIC CURVEs plate and practical oil field data contrast schematic diagram；
Fig. 2 is the Water-flooding characteristics relationship plate generation method flow chart of the embodiment of the present invention；
Fig. 3 is the WATER FLOODING CHARACTERISTIC CURVE plate of the embodiment of the present invention and practical oil field data contrast schematic diagram；
Fig. 4 is the structural schematic diagram of the Water-flooding characteristics relationship plate generating means of the embodiment of the present invention.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
WATER DISPLACEMENT CURVES is the indicatrix of water-drive pool, can not only predict that the exploitation of water-drive pool is dynamic using WATER DISPLACEMENT CURVES
State, but also the recoverable reserves and recovery ratio of predictable 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 promotes 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 to increase, and moisture content and water saturation are at certain relationship
Formula.By the principle of mass conservation and oil field phase percolation curve data, can obtain moisture content and crude oil recovery percent of reserves theory relation and
Oil field actual production data are plotted to theoretical plate and matched by curve plate, to analyze the development effectiveness in oil field and refer to
Following modification scenario is led, therefore only establishes rational WATER FLOODING CHARACTERISTIC CURVE relational expression and plate, could preferably analyze and refer to
Oil Guide field Efficient Development.
Therefore, the embodiment of the present invention provides a kind of Water-flooding characteristics relationship plate generation method, as shown in Fig. 2, the water drive is special
Levying relationship plate generation method includes：
S201：Obtain oil viscosity μo, water viscosity, muw, oil reservoir production fluid moisture content fw, residual oil saturation Sor, irreducible water contains
Water saturation SwiAnd oil saturation S under reset conditionoi；
S202：According to the oil viscosity μo, water viscosity, muwAnd residual oil saturation SorEstablish oil reservoir production fluid moisture content fw's
Relational expression：
S203：According to Buckley-Leverett water drives exit-end water saturation S is acquired for theoretical and Welge equationswe
With average water saturationExpression formula：
Wherein,
S204：To the oil reservoir production fluid moisture content fwIt differentiates, obtains the differential equation：
S205：The Formula of oil reservoir production fluid moisture content and recovery percent of reserves relationship is obtained according to formula (1) to (4) solution：
S206：According to the relation value for calculating oil reservoir production fluid moisture content and recovery percent of reserves in the Formula, and according to
The relation value draws Water-flooding characteristics relationship plate；
Wherein, SweExpression formula for exit-end water saturation, constant C is：
In above-mentioned equation, initial oil saturation, irreducible water saturation, residual oil saturation and different final are given
Oil recovery factor is updated in Formula (5), to which a series of moisture content and extraction under different ultimate recoveries be calculated
Degree of Accord Relation value draws graph of relation to get New Style Water Drive Characteristic Curve plate, as shown in Figure 3.
In step S202, according to the empirical theory of Ai Fu Rosss studies have shown that establishing oil reservoir production fluid moisture content fwPass
It is that the condition that formula (1) needs meet is：Underground viscosity ratio of oil and water is between 1~10.
In step S202, theoretical and Welge equations are replaced to acquire outlet end according to Buckley-Leverett water drives aqueous full
With degree SwWith average water saturationExpression formula, generally require and carried out under the conditions of non-piston type water drive oil.
In one embodiment, average water saturation is calculatedIt can be according to the principle of mass conservation (i.e. material balance original
Reason).
Illustrate above-mentioned Water-flooding characteristics relationship plate generation method with reference to specific example：
According to the empirical theory of Ai Fu Rosss studies have shown that when underground viscosity ratio of oil and water is when between 1~10, water-oil phase
The outlet end moisture content of flowing is：
Under the conditions of non-piston type water drive oil, acquired out for theoretical and Welge equations by Buckley-Leverett water drives
Mouth end water saturation and average water saturation expression formula are SweExit-end water saturation
Existing (2)
Know that average water saturation is represented by oil reservoir by material balance principle
It is obtained simultaneously by the differential equation
More than simultaneous (4)~(7) solution obtains oil reservoir production fluid moisture content and the Formula of recovery percent of reserves relationship is
Wherein constant C is related with water cut limit and ultimate recovery, and when ultimate water content takes 0.98, the expression formula of C is
In above-mentioned equation (6), initial oil saturation, irreducible water saturation, residual oil saturation and different are given
Final oil recovery is updated in the general solution that this patent obtains, a series of aqueous under different ultimate recoveries to be calculated
Rate and recovery percent of reserves relation value draw graph of relation to get New Style Water Drive Characteristic Curve plate, as shown in Figure 1.
It is averaged water saturation equation the present invention is based on former experimental research achievements and Welge, using differential equation theory,
It derives moisture content and the Formula of recovery percent of reserves, is mutually oozed in conjunction with practical oil field and creation data, drafting meet different oil fields
Theoretical WATER FLOODING CHARACTERISTIC CURVE.This theoretical plate (Fig. 1) founded is carried out with practical oil field data collection Tong Shi curves (such as Fig. 2)
Comparison, it can be seen that Tong Shi curves can not explain oil field later development data point, cannot reasonably predict that oil field finally produces
Degree (forecast recovery factor is more than 60%), and not only theoretical property is stronger for the plate (Fig. 1) that the present invention is drawn, but also can preferably solve
It releases oilfield water flooding development features and predicts that (forecast recovery factor is 45% to final waterflood recovery efficiency factor and oil reservoir calibration harvesting 43% connects
Closely).
From two it can be seen from the figure thats, with the exploitation in oil field, the relationship of moisture content and recovery percent of reserves (produces journey to horizontal axis
Degree) it is biased to, oilfield water flooding efficiency is all become better and better.However known by Buckley-Leverett water drive theories, when oil reservoir homogeneous
When property is good enough, water-free oil production period recovery percent of reserves will be higher, and can be seen that in theoretical curve not from Tong Shi theory plates
There is the value of water-free oil production period, while Tong Shi curves can not illustrate the variation of oil field later development data point；And this hair
Bright plate (Fig. 1) combines the real data in oil field that can draw the practical oilfield water flooding indicatrix for considering water-free oil production period,
Development Response of Oilfield and development index predication can preferably be analyzed.
The embodiment of the present invention provides a kind of Water-flooding characteristics relationship plate generating means, as shown in figure 4, the Water-flooding characteristics relationship
Plate generating means include：Parameter acquiring unit 401, moisture content relation reality unit 402, saturation computation unit 403 are micro-
Arithmetic element 404, Formula is divided to solve unit 405 and plate drawing unit 406.
Parameter acquiring unit 401 is for obtaining oil viscosity μo, water viscosity, muw, oil reservoir production fluid moisture content fw, residual oil saturation
Spend Sor, irreducible water water saturation Swi, oil saturation S under oil reservoir produced degree R and reset conditionoi；
Moisture content relation reality unit 402 is used for according to the oil viscosity μo, water viscosity, muwAnd residual oil saturation Sor
Establish oil reservoir production fluid moisture content fwRelational expression：
Saturation computation unit 403 is used to be acquired out for theoretical and Welge equations according to Buckley-Leverett water drives
Mouth end water saturation SweWith average water saturationExpression formula：
Wherein,
Unit 404 of differentiating is used for the oil reservoir production fluid moisture content fwIt differentiates, obtains the differential equation：
Formula solves unit 405 and is used to obtain oil reservoir production fluid moisture content and extraction journey according to formula (1) to (4) solution
The Formula of degree relationship：
Plate drawing unit 406 is used for according to calculating oil reservoir production fluid moisture content and recovery percent of reserves in the Formula
Relation value, and Water-flooding characteristics relationship plate is drawn according to the relation value；
Wherein, SweExpression formula for exit-end water saturation, constant C is：
In one embodiment, moisture content relation reality unit 402 is specifically used for：When underground grease viscosity between 1~
When between 10, according to the oil viscosity μo, water viscosity, muw, exit-end water saturation SweAnd residual oil saturation SorEstablish oil reservoir
Production fluid moisture content fwRelational expression.
In one embodiment, the saturation computation unit 403 is specifically used for：Under the conditions of non-piston type water drive oil, root
According to Buckley-Leverett water drives exit-end water saturation S is acquired for theoretical and Welge equationswWith average water saturationExpression formula.
In one embodiment, saturation computation unit 403, which is additionally operable to be calculated according to the principle of mass conservation, averagely contains water saturation
Degree
The present invention for derive at present and application moisture content and recovery percent of reserves relational expression there are the problem of, tested based on forefathers
Achievement, i.e. oil reservoir outlet end moisture content meet certain relational expression with water saturation；In combination with the principle of mass conservation and
Welge is averaged water saturation equation, establishes the differential equation of the moisture content about recovery percent of reserves, utilizes differential equation formula
Recovery percent of reserves and the general solution relational expression of moisture content are obtained, to draw corresponding WATER FLOODING CHARACTERISTIC CURVE figure according to practical data of mutually oozing
Version.Oil field actual production data are plotted on theoretical plate and compare and then analyzes water flooding effectiveness.
The present invention reduces empirical equation and close using the analytic expression of differential equation theory deduction moisture content and recovery percent of reserves
The error brought like value.According to practical oil field phase percolation curve data, different first boundary conditions is determined, to utilize differential side
Journey general solution determines the Water-flooding characteristics plate in oil field.
It should be understood by those skilled in the art that, the embodiment of the present invention can be provided as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the present invention
Apply the form of example.Moreover, the present invention can be used in one or more wherein include computer usable program code computer
The computer program production implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.)
The form of product.
The present invention be with reference to according to the method for the embodiment of the present invention, the flow of equipment (system) and computer program product
Figure and/or block diagram describe.It should be understood that can be realized by computer program instructions every first-class in flowchart and/or the block diagram
The combination of flow and/or box in journey and/or box and flowchart and/or the block diagram.These computer programs can be provided
Instruct the processor of all-purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine so that the instruction executed by computer or the processor of other programmable data processing devices is generated for real
The device for the function of being specified in present one flow of flow chart or one box of multiple flows and/or block diagram or multiple boxes.
These computer program instructions, which may also be stored in, can guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works so that instruction generation stored in the computer readable memory includes referring to
Enable the manufacture of device, the command device realize in one flow of flow chart or multiple flows and/or one box of block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device so that count
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, in computer or
The instruction executed on other programmable devices is provided for realizing in one flow of flow chart or multiple flows and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Specific embodiment is applied in the present invention, and principle and implementation of the present invention are described, above example
Explanation be merely used to help understand the present invention method and its core concept；Meanwhile for those of ordinary skill in the art,
According to the thought of the present invention, there will be changes in the specific implementation manner and application range, in conclusion in this specification
Appearance should not be construed as limiting the invention.
Claims (8)
1. a kind of Water-flooding characteristics relationship plate generation method, which is characterized in that the Water-flooding characteristics relationship plate generation method
Including：
Obtain oil viscosity μo, water viscosity, muw, oil reservoir production fluid moisture content fw, residual oil saturation Sor, irreducible water water saturation Swi
And oil saturation S under reset conditionoi；
According to the oil viscosity μo, water viscosity, muwAnd residual oil saturation SorEstablish oil reservoir production fluid moisture content fwRelational expression：
According to Buckley-Leverett water drives exit-end water saturation S is acquired for theoretical and Welge equationsweWith it is averagely aqueous
Saturation degreeExpression formula：
Wherein,
To the oil reservoir production fluid moisture content fwIt differentiates, obtains the differential equation：
The Formula of oil reservoir production fluid moisture content and recovery percent of reserves relationship is obtained according to formula (1) to (4) solution：
According to the relation value for calculating oil reservoir production fluid moisture content and recovery percent of reserves in the Formula, and according to the relation value
Water-flooding characteristics relationship plate is drawn, water drive law is analyzed according to the Water-flooding characteristics relationship plate and predicts that the final water drive in oil field is adopted
Yield；
Wherein, SweExpression formula for exit-end water saturation, constant C is：
Wherein, R indicates oil reservoir produced degree.
2. Water-flooding characteristics relationship plate generation method according to claim 1, which is characterized in that according to the oil viscosity μo、
Water viscosity, muw, exit-end water saturation SweAnd residual oil saturation SorEstablish oil reservoir production fluid moisture content fwRelational expression, packet
It includes：When underground grease viscosity is between 1~10, according to the oil viscosity μo, water viscosity, muw, exit-end water saturation
SweAnd residual oil saturation SorEstablish oil reservoir production fluid moisture content fwRelational expression.
3. Water-flooding characteristics relationship plate generation method according to claim 1, which is characterized in that according to Buckley-
Leverett water drives acquire exit-end water saturation S for theoretical and Welge equationswWith average water saturationExpression
Formula, including：Under the conditions of non-piston type water drive oil, acquired for theoretical and Welge equations according to Buckley-Leverett water drives
Exit-end water saturation SwWith the expression formula of average water saturation.
4. Water-flooding characteristics relationship plate generation method according to claim 1, which is characterized in that according to the principle of mass conservation
Calculate average water saturation
5. a kind of Water-flooding characteristics relationship plate generating means, which is characterized in that the Water-flooding characteristics relationship plate generating means
Including：
Parameter acquiring unit, for obtaining oil viscosity μo, water viscosity, muw, oil reservoir production fluid moisture content fw, residual oil saturation Sor、
Irreducible water water saturation Swi, oil saturation S under oil reservoir produced degree R and reset conditionoi；
Moisture content relation reality unit, for according to the oil viscosity μo, water viscosity, muwAnd residual oil saturation SorEstablish oil reservoir
Production fluid moisture content fwRelational expression：
Saturation computation unit, for acquiring outlet end for theoretical and Welge equations according to Buckley-Leverett water drives and containing
Water saturation SweWith average water saturationExpression formula：
Wherein,
It differentiates unit, for the oil reservoir production fluid moisture content fwIt differentiates, obtains the differential equation：
Formula solves unit, for obtaining oil reservoir production fluid moisture content and recovery percent of reserves relationship according to formula (1) to (4) solution
Formula：
Plate drawing unit, for according to the relationship for calculating oil reservoir production fluid moisture content and recovery percent of reserves in the Formula
Value, and Water-flooding characteristics relationship plate is drawn according to the relation value；
Wherein, SweExpression formula for exit-end water saturation, constant C is：
Wherein, R indicates oil reservoir produced degree.
6. Water-flooding characteristics relationship plate generating means according to claim 5, which is characterized in that the moisture content relational expression
Unit is established to be specifically used for：When underground grease viscosity is between 1~10, according to the oil viscosity μo, water viscosity, muw, go out
Mouth end water saturation SweAnd residual oil saturation SorEstablish oil reservoir production fluid moisture content fwRelational expression.
7. Water-flooding characteristics relationship plate generating means according to claim 5, which is characterized in that the saturation computation list
Member is specifically used for：Under the conditions of non-piston type water drive oil, asked for theoretical and Welge equations according to Buckley-Leverett water drives
Obtain exit-end water saturation SwWith average water saturationExpression formula.
8. Water-flooding characteristics relationship plate generating means according to claim 5, which is characterized in that saturation computation unit is also
For calculating average water saturation according to the principle of mass conservation
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