CN107038268A - A kind of method for determining heterogeneous reservoir five-spot pattern water drive sweep efficiency - Google Patents
A kind of method for determining heterogeneous reservoir five-spot pattern water drive sweep efficiency Download PDFInfo
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Abstract
The present invention relates to a kind of method for determining heterogeneous reservoir five-spot pattern water drive sweep efficiency, belong to oil development technical field, utilize the physical parameter for characterizing target reservoir, fluid flow parameter and oil displacement efficiency, determine the flow of the single flow tube in heterogeneous reservoir five-spot pattern between a bite well and a bite oil well, build the yield model and the yield model of five-spot pattern of single computing unit in five-spot pattern, on the basis of the water drive sweep efficiency and the corresponding relation of displacement multiple for setting up target reservoir five-spot pattern, determine the water drive sweep efficiency of target reservoir five-spot pattern, the invention provides a kind of influence for considering plain heterogeneity to water drive sweep efficiency, the high non-homogeneous pay five-spot pattern water drive sweep efficiency of water drive sweep efficiency computational accuracy determines method, it is that heterogeneous reservoir numerical simulation and on-site development adjustment provide foundation.
Description
Technical field
The present invention relates to a kind of method for determining heterogeneous reservoir five-spot pattern water drive sweep efficiency, belong to oil development skill
Art field.
Background technology
Water drive sweep efficiency is that water flood field carries out dynamic analysis, evaluates the important parameter of waterflooding effect, and it is directly affected
The recovery ratio of oilfield water flooding.Five-spot pattern by the four mouthfuls of oil recovery well constructions of a bite water injection well and its periphery is universal in oil reservoir development
A kind of pattern of spacing used.The determination method of current water drive sweep efficiency mainly has three kinds：
1), Type C water drive curve method.This method foundation is by accumulation fluid than the straight-line formula between cumulative liquid production
Obtained Type C water drive curve, derives the variation relation formula of water drive volumetric sweep efficiency and moisture content.This method is only applicable to
Third type water drive law, after the appearance of Water-flooding characteristics straightway is characterized, the water drive sweep efficiency error of its determination is larger.
2), oil displacement efficiency determines water drive sweep efficiency method.This method is expressed using water drive oil displacement efficiency, volumetric sweep efficiency
Formula, derives the theoretical relationship of water drive oil displacement efficiency, volumetric sweep efficiency and moisture content.This method excessively depends on target area
The crude oil high pressure property of block initial stage of development and the PVT static datas of description reservoir fluid properties, it is relatively low with produce reality degree of conformity.
3), laboratory experiment method, this method uses large scale nonhomogeneous soil layers, is surveyed using the saturation degree arranged on model
Probe is measured, the exploitation effect, pressure and saturation field for measuring water drive by dynamic change, and obtain the water drive under the conditions of different well patterns
Sweep efficiency.This method experimental procedure is more, cycle length, repeatability it is low.
In summary, under existence conditions, because the physical parameters such as heterogeneous reservoir permeability, porosity are in diverse location
Change greatly, the water drive sweep efficiency determined using the above method haves the shortcomings that precision is low, causes water flooding effect evaluation result
It is larger with produce reality error, and the above method not can determine that the water drive sweep efficiency of heterogeneous reservoir diverse location.
The content of the invention
The present invention seeks to overcome the above-mentioned water drive sweep efficiency determined in the prior art exist the low defect of precision there is provided
A kind of method for determining heterogeneous reservoir five-spot pattern water drive sweep efficiency.
The technical solution adopted by the present invention is to utilize physical parameter, fluid flow parameter and the displacement of reservoir oil effect for characterizing target reservoir
Rate, determines the flow of the single flow tube in heterogeneous reservoir five-spot pattern between a bite well and a bite oil well, builds 5 wells
The yield model of single computing unit and the yield model of five-spot pattern in net, are setting up the water drive ripple of target reservoir five-spot pattern
And coefficient is with the basis of the corresponding relation of displacement multiple, determining the water drive sweep efficiency of target reservoir five-spot pattern.
The technical scheme that the present patent application is used comprises the following steps：
1st, using the rock core and profit sample of target reservoir, it is determined that characterizing the physical parameter of target reservoir, characteristic of fluid ginseng
Number and oil displacement efficiency：
1.1st, using the rock core of target reservoir, the physical parameter for characterizing target reservoir, including permeability and porosity are determined；
1.2nd, using the profit sample of target reservoir, the fluid flow parameter for characterizing target reservoir, including stratum original are determined
Oil viscosity, stratum water viscosity, oil relative permeability and aqueous phase relative permeability；
1.3rd, experiment is mutually oozed using target reservoir rock core, determines and draw relative comprising oil relative permeability and aqueous phase
The relative permeability of permeability and the corresponding relation curve of water saturation；
1.4th, using the rock core and profit sample of target reservoir, the oil displacement efficiency of target reservoir is determined.
2nd, with a bite well and four mouthfuls of periphery oil well in target reservoir, five-spot pattern is built；Utilize oil-water two-phase flow
Model, determines the flow of the single flow tube in heterogeneous reservoir five-spot pattern between a bite well and a bite oil well.
3rd, the symmetry according to five-spot pattern, is divided into 8 identical computing units by five-spot pattern, is built using step 2
The discharge model of single flow tube is found, the yield model of single computing unit in five-spot pattern is built.
4th, using the yield model of single computing unit in the five-spot pattern of step 3 determination, the yield of five-spot pattern is built
Model.
5th, the five-spot pattern yield model determined using step 4, builds the water drive sweep efficiency of target reservoir five-spot pattern
With the corresponding relation of displacement multiple.
The flow that the single flow tube between a bite well and a bite oil well is determined in five-spot pattern described in step 2 is formula
(1) discharge model of the single flow tube shown in：
In formula：K is reservoir permeability；kroFor oil relative permeability；krwFor aqueous phase relative permeability；pwFor water injection well well
Bottom pressure；poFor producing well bottom pressure；L is the distance between water injection well and producing well；μoFor oil viscosity；μwFor ground
Layer water viscosity；ξ is the flow tube length from water injection well；A (ξ) is the flow tube sectional area at flow tube length ξ；Mobility ratio
The symmetry of foundation five-spot pattern described in step 3,8 identical computing units are divided into by five-spot pattern, profit
With the discharge model of single flow tube, the yield model of single computing unit in the five-spot pattern as shown in formula (2) is built：
In formula：L is flow tube length；rwFor wellbore radius；α is the angle of line between flow tube and two mouthfuls of oil wells.
The yield model of single computing unit in utilization five-spot pattern described in step 4, builds 5 wells as shown in formula (3)
The yield model of a bite oil well in net：
In formula：
a1=(pw-po)/(M1M2...Mn-1L+ξ1(1-M1)+ξ2M1(1-M2)+...+ξn-1M1M2...Mn-1(1-Mn-1))；h
For formation thickness；L is the distance between water injection well and producing well；Mobility ratio
The yield model of a bite oil well in five-spot pattern, the cumulative production for determining 4 mouthfuls of oil wells of five-spot pattern is：
Np=4Qt
In formula：NpFor the cumulative production of oil well；T is recovery time.
The cumulative production model using 4 mouthfuls of oil wells in the five-spot pattern determined described in step 5, builds shown in formula (4)
The water drive sweep efficiency of target reservoir five-spot pattern and the corresponding relation of displacement multiple, set up water drive sweep efficiency and displacement multiple
Corresponding relation curve, determine the water drive sweep efficiency of target reservoir five-spot pattern
In formula：EVFor water drive sweep efficiency；MpFor displacement multiple；N is oil in place；RoFor recovery percent of reserves；SoIt is full for oil-containing
And degree；EDFor oil displacement efficiency.
Beneficial effects of the present invention：The invention provides a kind of influence for considering plain heterogeneity to water drive sweep efficiency,
The high non-homogeneous pay five-spot pattern water drive sweep efficiency of water drive sweep efficiency computational accuracy determines method, is heterogeneous reservoir number
Value simulation and on-site development adjustment provide foundation.
Brief description of the drawings
Fig. 1 is the technology of the present invention route block diagram；
Fig. 2 is five-spot pattern schematic diagram of the present invention；
Fig. 3 is the corresponding relation curve of relative permeability of the present invention and water saturation；
Water drive sweep efficiency and displacement multiple proportion curve under the conditions of Fig. 4 is adopted to ooze that note is hypotonic in the present invention；
Fig. 5 is heterogeneous flat physical model of the invention.
Embodiment
With reference to specific implementation example, present invention is described, and the present invention comprises the following steps as shown in Figure 1：
Embodiment determines its water by taking the five-spot pattern of reservoir on certain oil field sand two shown in Fig. 2 as an example using following step
Drive sweep efficiency：
1st, using the rock core and profit sample of reservoir on certain oil field sand two, it is determined that characterizing the physical property of reservoir on certain oil field sand two
Parameter, fluid flow parameter and oil displacement efficiency.
1.1st, using the rock core of reservoir on certain oil field sand two, its permeability k is determined for 142.95md, porosity is that φ is
0.2387；
1.2nd, using the profit sample of reservoir on certain oil field sand two, oil viscosity μ is determinedoFor 1.25mPa.s, stratum
Water viscosity, muwFor 0.55mPa.s；
1.3rd, experiment is mutually oozed by reservoir core on certain oil field sand two, determines and draw and as shown in Figure 3 include oil phase
The corresponding relation curve of the relative permeability and water saturation of relative permeability and aqueous phase relative permeability；
1.4th, using the rock core and profit sample of reservoir on certain oil field sand two, the displacement of reservoir oil effect of reservoir on certain oil field sand two is determined
Rate EDFor 0.58；
2nd, using oil-water two-phase flow model, on certain oil field sand two shown in Fig. 2 in the five-spot pattern of reservoir, one is determined
The flow of single flow tube between mouth well saliva well and a bite oil well.
Connected, according to oil-water two-phase flow model, built single as shown in formula (1) by flow tube between setting oil, well
The discharge model of flow tube：
In formula：K is reservoir permeability；kroFor oil relative permeability；krwFor aqueous phase relative permeability；pwFor water injection well well
Bottom pressure；poFor producing well bottom pressure；L is the distance between water injection well and producing well；μoFor oil viscosity；μwFor ground
Layer water viscosity；ξ is the flow tube length from water injection well；A (ξ) is the flow tube sectional area at flow tube length ξ；Mobility ratio
3rd, the symmetry according to five-spot pattern, is divided into 8 identical computing units by five-spot pattern, is built using step 2
The discharge model of the vertical single flow tube as shown in formula (1), builds in the five-spot pattern as shown in formula (2) single computing unit
Yield model.
In formula：L is flow tube length；rwFor wellbore radius；α is the angle of line between flow tube and two mouthfuls of oil wells.
4th, using the yield model of single computing unit in the five-spot pattern of step 3 determination, build 5 points as shown in formula (3)
The yield model of a bite oil well is in well pattern：
In formula：
a1=(pw-po)/(M1M2...Mn-1L+ξ1(1-M1)+ξ2M1(1-M2)+...+ξn-1M1M2...Mn-1(1-Mn-1))；h
For formation thickness；Mobility ratio
The yield model of a bite oil well in five-spot pattern, the cumulative production for determining 4 mouthfuls of oil wells of five-spot pattern is：
Np=4Qt
In formula：NpFor the cumulative production of oil well；T is recovery time.
5th, using the cumulative production model of 4 mouthfuls of oil wells in the five-spot pattern of step 4 determination, reservoir on certain oil field sand two is built
The water drive sweep efficiency of five-spot pattern and the corresponding relation formula (4) of displacement multiple, draw water drive sweep efficiency as shown in Figure 4 with
The corresponding relation curve of displacement multiple.
In formula：EVFor water drive sweep efficiency；MpFor displacement multiple；N is oil in place；RoFor recovery percent of reserves；SoIt is full for oil-containing
And degree；EDFor oil displacement efficiency.
Comparative example 1
1st, laboratory experiment is asked for water drive sweep efficiency and comprised the following steps：
1.1st, heterogeneous plate models as shown in Figure 5 are prepared according to the physical parameter of reservoir on certain oil field sand two, it is non-equal
Matter flat plate model size is：Length × width × height=40cm × 40cm × 10cm.Be divided into three parts in model plane, from left to right for
Middle permeable formation, high permeability zone and less permeable layer.
1.2nd, the rock core demarcation sample for representing heterogeneous plate models each section characteristic is prepared.Demarcation sample size be：It is long
× wide × height=30cm × 3.9cm × 3.9cm.
1.3rd, the saturation degree demarcation of rock core demarcation sample
1.3.1, rock core demarcation Duplicate Samples at equal intervals arrangement 7 pairs of saturation degree electrodes, rating model gas permeability and
Gaseous porosity；
1.3.2, model is evacuated, saturation water, measurement model single-phase water permeability and 7 pairs of resistance electrode resistance values；
1.3.3, oily expelling water manufacture irreducible water (displacement 1.5pv), determines the oleic permeability value and 7 under irreducible water saturation
To saturation degree electrode resistance rate value；
1.3.4, water drive determines 7 couple under water phase permeability and residual oil state under residual oil state to residual oil state
Resistivity value.
1.4th, heterogeneous plate models five-spot pattern water drive sweep efficiency is asked for, is comprised the following steps：
1.4.1, model is evacuated, rating model average gas permeability and gaseous porosity；
1.4.2, saturation water, surveys model pore volume, water phase permeability and single-phase water resistivity value；
1.4.3, saturated oils, makes irreducible water saturation；Determine the saturation degree electrode resistance value after profit stabilization；
1.4.4, water drive oil, determines 49 pairs of saturation degree electrode resistance values, and the water transport of dynamic monitoring heterogeneity mould oil is moved
Rule and the change of water drive sweep efficiency.
2nd, according to plain heterogeneity flat board water drive laboratory experiment data, water drive sweep efficiency is drawn corresponding with displacement multiple
Relation curve, and result is added in Fig. 4.The water drive sweep efficiency laboratory experiment method of Fig. 4 and table 1 is contrasted with the inventive method
As a result show, the water drive laboratory experiment result and the inventive method of water drive sweep efficiency are basically identical, it can be seen that of the invention
The accuracy of result of implementation, and the inventive method is compared with laboratory experiment method, step is simple, calculates easy, elapsed time is short, can
It is repeated high.
The water drive sweep efficiency laboratory experiment data of table 1 and the inventive method Comparative result
Claims (7)
1. a kind of method for determining heterogeneous reservoir five-spot pattern water drive sweep efficiency, it is characterized in that：Using characterizing target reservoir
Physical parameter, fluid flow parameter and oil displacement efficiency, determine a bite well and a bite oil well in heterogeneous reservoir five-spot pattern
Between single flow tube flow, build five-spot pattern in single computing unit yield model and the yield mould of five-spot pattern
Type, on the basis of the water drive sweep efficiency and the corresponding relation of displacement multiple for setting up target reservoir five-spot pattern, determines target
The water drive sweep efficiency of reservoir five-spot pattern.
2. a kind of method for determining heterogeneous reservoir five-spot pattern water drive sweep efficiency according to claim 1, its feature
It is to comprise the following steps：
(1) using the rock core and profit sample of target reservoir, it is determined that characterize the physical parameter of target reservoir, fluid flow parameter and
Oil displacement efficiency；
(2) with a bite well and four mouthfuls of periphery oil well in target reservoir, five-spot pattern is built；Utilize oil-water two-phase flow mould
Type, determines the flow of the single flow tube in heterogeneous reservoir five-spot pattern between a bite well and a bite oil well；
(3) symmetry according to five-spot pattern, is divided into 8 identical computing units by five-spot pattern, utilizes single flow tube
Discharge model, builds the yield model of single computing unit in five-spot pattern；
(4) using the yield model of single computing unit in five-spot pattern, the yield model of five-spot pattern is built；
(5) using the five-spot pattern yield model determined, water drive sweep efficiency and the displacement times of target reservoir five-spot pattern are built
Several corresponding relations.
3. a kind of method for determining heterogeneous reservoir five-spot pattern water drive sweep efficiency according to claim 1 or 2, it is special
Levy and be to determine that the method for the physical parameter for characterizing target reservoir, fluid flow parameter and oil displacement efficiency comprises the following steps：
(1) using the rock core of target reservoir, the physical parameter for characterizing target reservoir, including permeability and porosity are determined；
(2) using the profit sample of target reservoir, the fluid flow parameter for characterizing target reservoir is determined, including in-place oil glues
Degree, stratum water viscosity, oil relative permeability and aqueous phase relative permeability；
(3) experiment is mutually oozed using target reservoir rock core, determines and draw comprising oil relative permeability and the relative infiltration of aqueous phase
The relative permeability of rate and the corresponding relation curve of water saturation；
(4) using the rock core and profit sample of target reservoir, the oil displacement efficiency of target reservoir is determined.
4. a kind of method for determining heterogeneous reservoir five-spot pattern water drive sweep efficiency according to claim 1 or 2, it is special
Levying is：The flow that the single flow tube between a bite well and a bite oil well is determined in five-spot pattern is single shown in formula (1)
The discharge model of flow tube：
In formula：K is reservoir permeability；kroFor oil relative permeability；krwFor aqueous phase relative permeability；pwPressed for water injection well shaft bottom
Power；poFor producing well bottom pressure；L is the distance between water injection well and producing well；μoFor oil viscosity；μwFor stratum water
Viscosity；ξ is the flow tube length from water injection well；A (ξ) is the flow tube sectional area at flow tube length ξ；Mobility ratio
5. a kind of method for determining heterogeneous reservoir five-spot pattern water drive sweep efficiency according to claim 4, its feature
It is：According to the symmetry of five-spot pattern, five-spot pattern is divided into 8 identical computing units, the flow of single flow tube is utilized
Model, builds the yield model of single computing unit in the five-spot pattern as shown in formula (2)：
In formula：L is flow tube length；rwFor wellbore radius；α is the angle of line between flow tube and two mouthfuls of oil wells.
6. a kind of method for determining heterogeneous reservoir five-spot pattern water drive sweep efficiency according to claim 5, its feature
It is：Using the yield model of single computing unit in five-spot pattern, the production of a bite oil well in the five-spot pattern as shown in formula (3) is built
Measure model：
In formula：
a1=(pw-po)/(M1M2...Mn-1L+ξ1(1-M1)+ξ2M1(1-M2)+...+ξn-1M1M2...Mn-1(1-Mn-1))；H is ground
Thickness degree；L is the distance between water injection well and producing well；Mobility ratio
The yield model of a bite oil well in five-spot pattern, the cumulative production for determining 4 mouthfuls of oil wells of five-spot pattern is：
Np=4Qt
In formula：NpFor the cumulative production of oil well；T is recovery time.
7. a kind of method of determination heterogeneous reservoir five-spot pattern water drive sweep efficiency according to claim 5 or 6, it is special
Levying is：Using the cumulative production model of 4 mouthfuls of oil wells in the five-spot pattern of determination, 5 wells of target reservoir shown in formula (4) are built
The water drive sweep efficiency of net and the corresponding relation of displacement multiple, the corresponding relation for setting up water drive sweep efficiency and displacement multiple are bent
Line, determines the water drive sweep efficiency of target reservoir five-spot pattern：
In formula：EVFor water drive sweep efficiency；MpFor displacement multiple；N is oil in place；RoFor recovery percent of reserves；SoFor oil saturation；
EDFor oil displacement efficiency.
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| CN107575207A (en) * | 2017-10-19 | 2018-01-12 | 陕西延长石油(集团)有限责任公司研究院 | A kind of method predicted oilfield water flooding and involve radius |
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| CN109559247A (en) * | 2017-09-27 | 2019-04-02 | 中国石油化工股份有限公司 | A kind of method of determining water drive experiment injection rate |
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| CN112240203A (en) * | 2020-11-10 | 2021-01-19 | 中国石油天然气股份有限公司 | Method and device for determining recovery ratio of oil reservoir |
| CN112240203B (en) * | 2020-11-10 | 2023-07-25 | 中国石油天然气股份有限公司 | Method and device for determining recovery ratio of oil reservoir |
| CN115828795A (en) * | 2023-02-10 | 2023-03-21 | 中国石油天然气股份有限公司 | Method and system for calculating water drive storage capacity control degree of old oil field |
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