CN104879104B - Oil reservoir water injection method - Google Patents
Oil reservoir water injection method Download PDFInfo
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Abstract
The invention provides an oil reservoir water injection method, and relates to the technical field of oil reservoir water injection development. The method includes the steps: establishing a multiple regression model with the injection water quantity of a center water injection well as a dependent variable and the liquid production capacities of production wells as independent variables, and performing multiple regression computation to determine the single-well injection water quantity of the water injection well; determining the gravitational differentiation influence coefficient and the water-oil mobility ratio of an oil reservoir through geological data and oil reservoir data; determining the gravitational differentiation degree values corresponding to the gravitational differentiation influence coefficient and the water-oil mobility ratio of the oil reservoir on a preset gravitational differentiation chart according to the gravitational differentiation influence coefficient and the water-oil mobility ratio of the oil reservoir; determining the theoretical minimum perforation thickness according to the single-well meter injectivity index of the water injection well, the maximum well bottom pressure of the water injection well, the formation pressure and the single-well injection water quantity; determining the perforation thickness according to the thickness of an oil reservoir layer, the theoretical minimum perforation thickness and the gravitational differentiation degree values, and injecting water into the water injection well.
Description
Technical field
The present invention relates to reservoir waterflooding technical field, more particularly to a kind of reservoir water method.
Background technology
At present, reservoir water is a kind of mode commonly used in oilfield exploitation procedure, and by water filling oil reservoir pressure can be stablized
Power, improves oil recovery.Generally, large-scale oil reservoir is developed using a set of well pattern, water injection well and life in well pattern
Produce well to be arranged according to certain rule, and injection allocation is carried out to water injection well in certain method.And at present due to many oil fields
Available water source it is limited, how to obtain as far as possible high recovery ratio by existing water source is one of difficult point during waterflooding extraction,
And rational allocation method is the big key for determining water flooding effect at present.
The research that currently existing technology is carried out to water injection rate injection allocation typically solves the distribution of plane water injection rate or for many
The computational methods that the water injection rate of layer oil reservoir is split point.As waterflooding extraction proceeds to certain period, oil production and reservoir pressure are equal
Appearance to a certain degree declines, and Water injection rate is at this moment carried out to water injection well in oil fields to keep reservoir pressure and improve recovery ratio.So
And, there is presently no carries out the research of the upper water injection rate distribution in longitudinal direction for the larger oil reservoir of thickness in monolayer.How single monolayer thick is directed to
The water injection rate distribution that the larger oil reservoir of degree is carried out on longitudinal direction is a problem urgently to be resolved hurrily at present.
The content of the invention
The embodiment of the present invention provides a kind of reservoir water method, to solve prior art in be difficult to it is larger for thickness in monolayer
Oil reservoir carry out on longitudinal direction water injection rate distribution problem.
In order to achieve the above object, the present invention is adopted the following technical scheme that：
A kind of reservoir water method, including：
Liquid output of the oil field target well group water injection well with fluence and each producing well is obtained, and with the central water flooding well injection allocation
Measure as dependent variable, the Liquid output of each producing well is independent variable, sets up multivariate regression models；
Multivariate linear equation is carried out according to the multivariate regression models, the individual well for determining water injection well matches somebody with somebody fluence；
Determine that gravitational differentiation affects the water-oil mobility ratio of coefficient and oil reservoir by geologic information and oil reservoir data；
The water-oil mobility ratio of coefficient and the oil reservoir is affected according to the gravitational differentiation, in the gravitational differentiation for pre-setting
Determine that the gravitational differentiation affects the gravitational differentiation degree value corresponding to the water-oil mobility ratio of coefficient and oil reservoir on plate；
Obtain individual well rice injectivity index, water injection well maximum bottom pressure and the strata pressure of water injection well；
Individual well rice injectivity index, water injection well maximum bottom pressure, strata pressure and individual well according to the water injection well is matched somebody with somebody
Fluence determines theoretical minimum perforation thickness；
Oil reservoir thickness is obtained, and according to the oil reservoir thickness, theoretical minimum perforation thickness and gravitational differentiation journey
Angle value determines perforation thickness；
Water filling is carried out to the water injection well according to the perforation thickness.
Specifically, Liquid output of the acquisition oil field target well group water injection well with fluence and each producing well, and with described
Heart water injection well is dependent variable with fluence, and the Liquid output of each producing well is independent variable, sets up multivariate regression models, including：
Set up the first multivariate regression models：
Qiw=b0+Ql1b1+Ql2b2+...+Qlkbk+...+Qlmbm
Wherein, b0, b1,...,bmFor regression coefficient；QiwIndividual well for water injection well matches somebody with somebody fluence；Ql1, Ql2..., QlmIt is and note
The Liquid output of each producing well of well connection；
According to first multivariate regression models, partial correlation coefficient r is calculatedj：
Wherein：
qjFor the sum of square of deviations of jth mouth well；Q ' is minimum deflection square
With；K=1,2 ... m；M is producing well sum；I=1,2 ... n；N is the group number of historical production data；
To the partial correlation coefficient rjIt is normalized, obtains incidence coefficient γk, and build the second multiple regression mould
Type；
Wherein：Second multivariate regression models is：
Qiw=Ql1γ1+Ql2γ2+...+Qlkγk+...+Qlmγm。
Specifically, it is described that multivariate linear equation is carried out according to the multivariate regression models, determine the individual well injection allocation of water injection well
Amount, including：
Multivariate linear equation is carried out according to second multivariate regression models, the individual well for determining water injection well matches somebody with somebody fluence.
Specifically, it is described to determine that gravitational differentiation affects coefficient by geologic information and oil reservoir data, including：
Oil reservoir horizontal permeability k is obtained by the geologic informationh, vertical permeability kvAnd average seepage section product
Profit density contrast Δ ρ, viscosity of crude μ are obtained by the oil reservoir dataoAnd waterflood injection rate q；
Determine that gravitational differentiation affects coefficient G：
Specifically, the gravitational differentiation plate for pre-setting includes the water-oil mobility ratio song of a coordinate system and a plurality of oil reservoir
Line, the value of water-oil mobility ratio curve one water-oil mobility ratio of correspondence of every oil reservoir；The abscissa of the coordinate system is gravitational differentiation
Coefficient is affected, ordinate is gravity differential degree value；
The water-oil mobility ratio for affecting coefficient and the oil reservoir according to the gravitational differentiation, in the gravity for pre-setting
Divide the gravitational differentiation degree value for determining that the gravitational differentiation is affected corresponding to the water-oil mobility ratio of coefficient and oil reservoir on different plate, bag
Include：
According to the water-oil mobility ratio of the oil reservoir, the water oil stream of the oil reservoir is determined on the gravitational differentiation plate for pre-setting
Spend the water-oil mobility ratio curve than corresponding oil reservoir；
Determine that the gravitational differentiation affects coefficient on the abscissa, and correspondence obtains the water-oil mobility ratio song of the oil reservoir
An impact point on line, determines the abscissa value of the impact point, using the abscissa value as the gravitational differentiation degree value.
Specifically, individual well rice injectivity index, water injection well maximum bottom pressure, the strata pressure according to the water injection well
And individual well determines theoretical minimum perforation thickness with fluence, including：
According to formula：It is determined that theoretical minimum perforation thickness hmin；Wherein, Ii is the individual well rice
Injectivity index；pfmaxFor water injection well maximum bottom pressure；prFor the strata pressure.
Specifically, it is described to be determined according to the oil reservoir thickness, theoretical minimum perforation thickness and gravitational differentiation degree value
Perforation thickness, including：
According to formula：
H=H- (H-hmin)E
Determine the perforation thickness h；Wherein, H is the oil reservoir thickness；E is the gravitational differentiation degree value.
A kind of reservoir water method provided in an embodiment of the present invention, by setting up multivariate regression models, it is determined that water injection well
Individual well match somebody with somebody fluence；Determine that gravitational differentiation affects the water-oil mobility ratio of coefficient and oil reservoir by geologic information and oil reservoir data, and
Determine that the gravitational differentiation affects the gravitational differentiation degree value corresponding to the water-oil mobility ratio of coefficient and oil reservoir；Afterwards according to water injection well
Individual well rice injectivity index, water injection well maximum bottom pressure, strata pressure and individual well determine that theoretical minimum perforation is thick with fluence
Degree；So as to the perforation thickness needed for being determined according to oil reservoir thickness, theoretical minimum perforation thickness and gravitational differentiation degree value；This
Sample can carry out water filling according to the perforation thickness to the water injection well.It can be seen that, the present invention solved and be difficult in prior art for single
The larger oil reservoir of thickness degree carries out the problem of the water injection rate distribution on longitudinal direction, and to water injection well in oil fields Water injection rate has been carried out, so as to
Reservoir pressure can be kept, and then improves recovery ratio.
Description of the drawings
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, without having to pay creative labor, may be used also
To obtain other accompanying drawings according to these accompanying drawings.
Fig. 1 is the flow chart one of reservoir water method provided in an embodiment of the present invention；
Fig. 2 is the flowchart 2 of reservoir water method provided in an embodiment of the present invention；
Fig. 3 is the gravitational differentiation plate schematic diagram in the embodiment of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than the embodiment of whole.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
As shown in figure 1, a kind of reservoir water method provided in an embodiment of the present invention, including：
Step 101, acquisition oil field Liquid output of the target well group water injection well with fluence and each producing well, and with central water flooding well
It is dependent variable with fluence, the Liquid output of each producing well is independent variable, sets up multivariate regression models.
Step 102, multivariate linear equation is carried out according to multivariate regression models, the individual well for determining water injection well matches somebody with somebody fluence.
Step 103, the water-oil mobility ratio that gravitational differentiation impact coefficient and oil reservoir are determined by geologic information and oil reservoir data.
Step 104, the water-oil mobility ratio that coefficient and oil reservoir are affected according to the gravitational differentiation, in the gravity for pre-setting point
Determine that the gravitational differentiation affects the gravitational differentiation degree value corresponding to the water-oil mobility ratio of coefficient and oil reservoir on different plate.
Step 105, the individual well rice injectivity index for obtaining water injection well, water injection well maximum bottom pressure and strata pressure.
Step 106, the individual well rice injectivity index according to water injection well, water injection well maximum bottom pressure, strata pressure and list
Well determines theoretical minimum perforation thickness with fluence.
Step 107, acquisition oil reservoir thickness, and according to oil reservoir thickness, theoretical minimum perforation thickness and gravity point
DRS angle value determines perforation thickness.
Step 108, water filling is carried out to water injection well according to perforation thickness.
A kind of reservoir water method provided in an embodiment of the present invention, by setting up multivariate regression models, it is determined that water injection well
Individual well match somebody with somebody fluence；Determine that gravitational differentiation affects the water-oil mobility ratio of coefficient and oil reservoir by geologic information and oil reservoir data, and
Determine that the gravitational differentiation affects the gravitational differentiation degree value corresponding to the water-oil mobility ratio of coefficient and oil reservoir；Afterwards according to water injection well
Individual well rice injectivity index, water injection well maximum bottom pressure, strata pressure and individual well determine that theoretical minimum perforation is thick with fluence
Degree；So as to the perforation thickness needed for being determined according to oil reservoir thickness, theoretical minimum perforation thickness and gravitational differentiation degree value；This
Sample can carry out water filling according to the perforation thickness to the water injection well.It can be seen that, the present invention solved and be difficult in prior art for single
The larger oil reservoir of thickness degree carries out the problem of the water injection rate distribution on longitudinal direction, and to water injection well in oil fields Water injection rate has been carried out, so as to
Reservoir pressure can be kept, and then improves recovery ratio.
The present invention is better understood from for the ease of those skilled in the art, a more specifically embodiment is set forth below,
As shown in Fig. 2 a kind of reservoir water method provided in an embodiment of the present invention, including：
Step 201, acquisition oil field Liquid output of the target well group water injection well with fluence and each producing well, and with central water flooding well
It is dependent variable with fluence, the Liquid output of each producing well is independent variable, sets up the first multivariate regression models.
Wherein, first multivariate regression models is：
Qiw=b0+Ql1b1+Ql2b2+...+Qlkbk+...+Qlmbm
Wherein, b0, b1,...,bmFor regression coefficient；QiwIndividual well for water injection well matches somebody with somebody fluence；Ql1, Ql2..., QlmIt is and note
The Liquid output of each producing well of well connection；M is the quantity of the producing well.
Step 202, according to first multivariate regression models, calculate partial correlation coefficient.
The partial correlation coefficient is rj：
Wherein：
qjFor the sum of square of deviations of jth mouth well；Q ' is minimum deflection square
With；K=1,2 ... m；M is producing well sum；I=1,2 ... n；N is the group number of historical production data.
Step 203, partial correlation coefficient is normalized, obtains incidence coefficient, and build the second multiple regression mould
Type.
Wherein, the incidence coefficient is γk：
Second multivariate regression models is：
Qiw=Ql1γ1+Ql2γ2+...+Qlkγk+...+Qlmγm。
Step 204, multivariate linear equation is carried out according to the second multivariate regression models, the individual well for determining water injection well matches somebody with somebody fluence.
What deserves to be explained is, now the individual well of water injection well matches somebody with somebody fluence QiwUnit be m3/mon。
Step 205, by geologic information obtain oil reservoir horizontal permeability, vertical permeability and average seepage section product.
Herein, oil reservoir horizontal permeability is kh, unit is md, vertical permeability is kv, unit is md, the average seepage flow section
Area is
Step 206, by oil reservoir data obtain profit density contrast, viscosity of crude, waterflood injection rate and oil reservoir water oil stream
Degree ratio.
Herein, profit density contrast is Δ ρ, and unit is g/cm3, viscosity of crude is μo, unit is mPas, waterflood injection rate is
Q, unit is m3/d；The water-oil mobility ratio of oil reservoir is M.
Step 207, determine gravitational differentiation affect coefficient.
Herein, gravitational differentiation impact coefficient is：
Step 208, according to the water-oil mobility ratio of oil reservoir, the water of the oil reservoir is determined on the gravitational differentiation plate for pre-setting
The water-oil mobility ratio curve of the corresponding oil reservoir of oily mobility ratio；Determine that gravitational differentiation affects coefficient, and correspondence to obtain on the horizontal scale
An impact point on the water-oil mobility ratio curve of the oil reservoir, determines the abscissa value of impact point, using the abscissa value as gravity
Differential degree value.
What deserves to be explained is, as shown in figure 3, the gravitational differentiation plate for pre-setting includes a coordinate system and a plurality of oil reservoir
Water-oil mobility ratio curve, the value of water-oil mobility ratio curve one water-oil mobility ratio of correspondence of every oil reservoir, the M difference in such as Fig. 3
For 20,10,5,2,1,0.2, then the water-oil mobility ratio curve of 6 oil reservoirs is corresponded to；The abscissa of the coordinate system is gravitational differentiation
Coefficient G is affected, ordinate is gravity differential degree value E.
Generally, the expression formula of gravitational differentiation degree value E is：
Wherein, VE(no-gravity)For water breakthrough during agravic impact when volumetric sweep efficiency, i.e. body during water breakthrough during G=0
Product sweep efficiency；VE(gravity)Volumetric sweep efficiency during to there is water breakthrough when gravity affects.
By gravitational differentiation degree value E, influence power of the gravity in oil reservoir can be known, gravitational differentiation degree value E
Excursion is that 0 to 1, E values are higher, shows that Action of Gravity Field is more notable.Be not in the feelings of E=1 in the case of actual oil reservoir
Condition；And as E=0, gravity is represented without impact, can be using conventional commingled water injection；When 0<E<When 1, can affect according to gravity
Size, reduces the bottom perforating degree of water injection well.
Step 209, the individual well rice injectivity index for obtaining water injection well, water injection well maximum bottom pressure and strata pressure, and
Individual well rice injectivity index, water injection well maximum bottom pressure, strata pressure and individual well according to water injection well determines theoretical with fluence
Minimum perforation thickness.
According to formula：It is determined that theoretical minimum perforation thickness hmin；Wherein, Ii is the water suction of individual well rice
Index, unit is m3/d·Mpa·m；pfmaxFor water injection well maximum bottom pressure；prFor strata pressure.
Minimum perforation thickness need to be met in follow-up perforation, to prevent in preferred perforation thickness, thickness is too small can not be same
When meet the requirement of water injection pressure and waterflood injection rate.Perforating site top can be defaulted as oil reservoir top.
Step 210, acquisition oil reservoir thickness, and according to oil reservoir thickness, theoretical minimum perforation thickness and gravity point
DRS angle value determines perforation thickness, and carries out water filling to water injection well according to perforation thickness.
The oil reservoir thickness can be obtained from geologic information.
Herein, can be according to formula：H=H- (H-hmin) E, determine perforation thickness h；Wherein, H be oil reservoir thickness, E
For the gravitational differentiation degree value.
A kind of reservoir water method provided in an embodiment of the present invention, by setting up multivariate regression models, it is determined that water injection well
Individual well match somebody with somebody fluence；Determine that gravitational differentiation affects the water-oil mobility ratio of coefficient and oil reservoir by geologic information and oil reservoir data, and
Determine that the gravitational differentiation affects the gravitational differentiation degree value corresponding to the water-oil mobility ratio of coefficient and oil reservoir；Afterwards according to water injection well
Individual well rice injectivity index, water injection well maximum bottom pressure, strata pressure and individual well determine that theoretical minimum perforation is thick with fluence
Degree；So as to the perforation thickness needed for being determined according to oil reservoir thickness, theoretical minimum perforation thickness and gravitational differentiation degree value；This
Sample can carry out water filling according to the perforation thickness to the water injection well.It can be seen that, the present invention solved and be difficult in prior art for single
The larger oil reservoir of thickness degree carries out the problem of the water injection rate distribution on longitudinal direction, and to water injection well in oil fields Water injection rate has been carried out, so as to
Reservoir pressure can be kept, and then improves recovery ratio.
Apply specific embodiment in the present invention to be set forth the principle and embodiment of the present invention, above example
Explanation be only intended to help and understand the method for the present invention and its core concept；Simultaneously for one of ordinary skill in the art,
According to the thought of the present invention, will change in specific embodiments and applications, in sum, in this specification
Appearance should not be construed as limiting the invention.
Claims (7)
1. a kind of reservoir water method, it is characterised in that include：
Liquid output of the oil field target well group central water flooding well with fluence and each producing well is obtained, and with the central water flooding well injection allocation
Measure as dependent variable, the Liquid output of each producing well is independent variable, sets up multivariate regression models；
Multivariate linear equation is carried out according to the multivariate regression models, the individual well for determining water injection well matches somebody with somebody fluence；
Determine that gravitational differentiation affects the water-oil mobility ratio of coefficient and oil reservoir by geologic information and oil reservoir data；
The water-oil mobility ratio of coefficient and the oil reservoir is affected according to the gravitational differentiation, in a gravitational differentiation plate for pre-setting
It is upper to determine that the gravitational differentiation affects the gravitational differentiation degree value corresponding to the water-oil mobility ratio of coefficient and oil reservoir；
Obtain individual well rice injectivity index, water injection well maximum bottom pressure and the strata pressure of water injection well；
Individual well rice injectivity index, water injection well maximum bottom pressure, strata pressure and individual well according to the water injection well matches somebody with somebody fluence
It is determined that theoretical minimum perforation thickness；
Oil reservoir thickness is obtained, and according to the oil reservoir thickness, theoretical minimum perforation thickness and gravitational differentiation degree value
Determine perforation thickness；
Water filling is carried out to the water injection well according to the perforation thickness.
2. reservoir water method according to claim 1, it is characterised in that the acquisition oil field target well group central water flooding
Liquid output of the well with fluence and each producing well, and fluence is matched somebody with somebody as dependent variable with the central water flooding well, the Liquid output of each producing well
For independent variable, multivariate regression models is set up, including：
Set up the first multivariate regression models：
Qiw=b0+Ql1b1+Ql2b2+...+Qlkbk+...+Qlmbm
Wherein, b0, b1,...,bmFor regression coefficient；QiwIndividual well for water injection well matches somebody with somebody fluence；Ql1, Ql2..., QlmIt is and water injection well
The Liquid output of each producing well of connection；
According to first multivariate regression models, partial correlation coefficient r is calculatedj：
Wherein：
qjFor the sum of square of deviations of jth mouth well；Q ' is minimum deflection quadratic sum；k
=1,2 ... m；M is producing well sum；I=1,2 ... n；N is the group number of historical production data；
To the partial correlation coefficient rjIt is normalized, obtains incidence coefficient γk, and build the second multivariate regression models；
Wherein：Second multivariate regression models is：
Qiw=Ql1γ1+Ql2γ2+...+Qlkγk+...+Qlmγm。
3. reservoir water method according to claim 2, it is characterised in that described to be carried out according to the multivariate regression models
Multivariate linear equation, the individual well for determining water injection well matches somebody with somebody fluence, including：
Multivariate linear equation is carried out according to second multivariate regression models, the individual well for determining water injection well matches somebody with somebody fluence.
4. reservoir water method according to claim 3, it is characterised in that described true by geologic information and oil reservoir data
Determining gravitational differentiation affects coefficient, including：
Oil reservoir horizontal permeability k is obtained by the geologic informationh, vertical permeability kvAnd average seepage section product
Profit density contrast Δ ρ, viscosity of crude μ are obtained by the oil reservoir dataoAnd waterflood injection rate q；
Determine that gravitational differentiation affects coefficient G：
5. reservoir water method according to claim 4, it is characterised in that the gravitational differentiation plate bag for pre-setting
Include the water-oil mobility ratio curve of a coordinate system and a plurality of oil reservoir, water-oil mobility ratio curve one water-oil mobility ratio of correspondence of every oil reservoir
Value；The abscissa of the coordinate system is gravity influence of different distribution coefficient, and ordinate is gravity differential degree value；
The water-oil mobility ratio for affecting coefficient and the oil reservoir according to the gravitational differentiation, in the gravitational differentiation for pre-setting
Determine that the gravitational differentiation affects the gravitational differentiation degree value corresponding to the water-oil mobility ratio of coefficient and oil reservoir on plate, including：
According to the water-oil mobility ratio of the oil reservoir, the water-oil mobility ratio of the oil reservoir is determined on the gravitational differentiation plate for pre-setting
The water-oil mobility ratio curve of corresponding oil reservoir；
Determine that the gravitational differentiation affects coefficient, and correspondence to obtain on the water-oil mobility ratio curve of the oil reservoir on the abscissa
An impact point, the ordinate value of the impact point is determined, using the ordinate value as the gravitational differentiation degree value.
6. reservoir water method according to claim 5, it is characterised in that described to be inhaled according to the individual well rice of the water injection well
Aqua index, water injection well maximum bottom pressure, strata pressure and individual well determine theoretical minimum perforation thickness with fluence, including：
According to formula：It is determined that theoretical minimum perforation thickness hmin；Wherein, Ii is individual well rice water suction
Index；pf maxFor water injection well maximum bottom pressure；prFor the strata pressure.
7. reservoir water method according to claim 6, it is characterised in that described according to the oil reservoir thickness, reason
Determine perforation thickness by minimum perforation thickness and gravitational differentiation degree value, including：
According to formula：
H=H- (H-hmin)E
Determine the perforation thickness h；Wherein, H is the oil reservoir thickness；E is the gravitational differentiation degree value.
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