CN107766689B - Method for establishing reservoir permeability time-varying model for developing dynamic constraint - Google Patents
Method for establishing reservoir permeability time-varying model for developing dynamic constraint Download PDFInfo
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Abstract
The invention provides a method for establishing a reservoir permeability time-varying model for developing dynamic constraints, which comprises the following steps: step 1, researching the time-varying law of reservoir permeability at different water-containing stages; step 2, representing the plane distribution of the liquid passing amount in different periods; step 3, logging and secondarily explaining the permeability of the reservoir; and step 4, establishing a three-dimensional time-varying model. The parameters required by the method for establishing the reservoir permeability time-varying model for developing the dynamic constraint are easy to obtain, the operation is simple and easy to implement, and the permeability parameter time-varying model can be established.
Description
Technical Field
The invention relates to the field of fine research on development reservoirs of oil and gas fields, and mainly relates to the content of time-varying research on the permeability of a reservoir after long-term water injection and flushing of a medium-high permeability reservoir.
Background
The integral oil field of the victory oil field is developed by water injection for decades and undergoes four development stages of initial water content, medium water content, high water content and ultrahigh water content, wherein most of the oil fields enter the ultrahigh water content development stage, the comprehensive water content of the oil fields reaches or exceeds 90 percent, and under the conditions, the oil field oil and water stabilization and control are realized, the oil and gas recovery ratio is improved, and the dynamic model of the reservoir parameter change rule and the underground reservoir change is required to be researched, so that the aim of improving the oil field recovery ratio can be realized.
From the view of a large amount of literature, the research on the distribution of residual oil in different water-containing stages of a long-term water flooding oil field mainly describes the distribution of the residual oil by researching the variation rule of reservoir parameters, and a great deal of work has been done by people before this point, and a lot of methods are adopted. But in general, the reservoir parameter variation rule is more from the one-dimensional two-dimensional qualitative research, and is relatively less from the three-dimensional quantitative research.
The concept of three-dimensional geological modeling was first proposed by simonwho, canada, in 1993. The three-dimensional geological modeling is a new technology for geological research by combining tools such as spatial information management, geological interpretation, spatial analysis and prediction, geostatistics statistics, entity content analysis, graphic visualization and the like under a three-dimensional environment by using a computer technology. China has also evolved twenty years faster since the beginning of the 80's last century, with the introduction of easthvision. But recall that geologic modeling in oilfield development provides a fundamental model for numerical simulation and for overall evaluation of the reservoir. In the existing three-dimensional fine modeling, a time-varying rule is mainly summarized and a phase model is established in the aspect of time variation of permeability parameters of a reservoir, but the heterogeneity of a permeability time-varying degree plane in different phases is not considered and is linked with the liquid passing amount of the reservoir. Therefore, a new method for establishing a reservoir permeability time-varying model with dynamic constraint is developed, and the technical problems are solved.
Disclosure of Invention
The invention aims to provide a method for establishing a reservoir permeability time-varying model with easy-to-obtain parameters and simple and easy-to-operate development dynamic constraints.
The object of the invention can be achieved by the following technical measures: method for establishing reservoir permeability time-varying model for developing dynamic constraints, and method for establishing reservoir permeability time-varying model for developing dynamic constraints
The object of the invention can also be achieved by the following technical measures:
the method for establishing reservoir permeability time-varying model for developing dynamic constraint
According to the method for establishing the reservoir permeability time-varying model for developing the dynamic constraint, firstly, coring data of the same sedimentary microfacies adjacent to well site positions in different development periods are selected, and the variation rule of permeability parameters is summarized. And then, interpolating by using the liquid passing amount of each well point in different periods, researching the plane characteristics of the liquid passing amount of the mine field in different periods, and establishing liquid passing amount equivalent graphs in different periods. And then, the logging curve of the completed well in each period is utilized to carry out secondary interpretation of logging, and the permeability of the reservoir stratum is explained. And finally, using the permeability explanation results of the completed wells in each period, carrying out constraint by using the excess fluid volume equivalent diagram in the period, and respectively establishing a time-varying model of the permeability parameter of the reservoir by adopting a deterministic modeling method and a stochastic modeling method. The parameters required by the method are easy to obtain, the operation is simple and easy to implement, and a permeability parameter time-varying model can be established.
Drawings
FIG. 1 is a flow diagram of one embodiment of a method of establishing a dynamically constrained reservoir permeability time varying model according to the present invention;
FIG. 2 is a histogram of core analysis permeability at different times in an embodiment of the present disclosure;
FIG. 3 is a cross-sectional view of a standard stratigraphic association well of 14 key wells in a winning Tuo oilfield in accordance with an embodiment of the present invention;
FIG. 4 is a model diagram illustrating permeability at low water cut in the second zone of the ShengTuo oil field in accordance with an embodiment of the present invention;
FIG. 5 is an explanatory precision analysis diagram of permeability of low water cut of the second zone of the Sheng Tuo oil field in accordance with an embodiment of the present invention;
FIG. 6 is a model diagram illustrating permeability in the high water cut phase in the second zone of the winning Tuo oil field in accordance with one embodiment of the present invention;
FIG. 7 is an analytical accuracy chart for the permeability of high water cut in the second zone of the Shengtu oil field in accordance with an embodiment of the present invention;
FIG. 8 is an explanatory model diagram of permeability of very high water cut in the second zone of the ShengTuo oil field in an embodiment of the present invention;
FIG. 9 is an explanatory accuracy analysis diagram of permeability of ultra-high water cut in the second zone of the Sheng Tuo oil field in accordance with an embodiment of the present invention;
FIG. 10 is a low water cut permeability model of a winning Turbon field two zone in accordance with an embodiment of the present invention;
FIG. 11 is a model of permeability in the medium and high water cut phase for the second zone of the winning Tuo oil field in accordance with an embodiment of the present invention;
fig. 12 is a model of very high water cut permeability for the winning-lump oil field two zone in an embodiment of the present invention.
Detailed Description
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Reservoir development hydrodynamic geology is the dominant geology that controls reservoir macroscopical and seepage parameter dynamic changes. Along with the deepening of the water injection development process, injected water with different properties with fluids (crude oil and formation water) in a reservoir soaks and drives the reservoir for a long time, so that the reservoir is transformed, the microscopic properties of the reservoir are subjected to physical and chemical actions, and the macroscopic parameters of the reservoir are changed. The medium-high permeability oil reservoir undergoes the washing of long-term water injection, and the microscopic pore-throat skeleton, pore-throat network, pore wall and periphery, clay minerals and stratum particles of the reservoir are all changed obviously. Stratum particles are brought out of the ground along with oil field development fluid, so that the pore throat radius of a reservoir is increased, the coordination number of the pore throat is increased, the connectivity is improved, and the permeability is improved. The time variation of the reservoir permeability is therefore directly linked to the amount of fluid passing. The invention provides a method for establishing a medium and high permeability reservoir time-varying model for long-term water injection scouring.
Fig. 1 is a flow chart of an embodiment of the method for building a dynamically constrained reservoir permeability time-varying model according to the present invention.
In step 101, the time-varying law of reservoir permeability at different water-bearing stages is studied. The development process is divided into four stages: before water injection, a medium-high water content period, a high water content period and an extra-high water content period. And preferably selecting the core wells in each period, and selecting the core wells which are adjacent to the well site, belong to the same sedimentary microfacies type, have the same sand body development degree and are drilled at different water-containing stages through analyzing the core data and the logging data of the core wells. And (4) counting the time-varying law of the permeability of the reservoir due to the difference of the water-containing stages. The physical property parameter statistics of the four-stage core well show that: the permeability is continuously increased along with the influence of water injection scouring, the change rule of the permeability in four stages is 1:1.09:1.12:1.20, and the permeability is obviously increased along with the development of water injection. The flow proceeds to step 102.
In step 102, the planar distribution of the amount of fluid passing through at different times is characterized. Interpolation is carried out by utilizing the liquid passing amount of each well point in different periods, and liquid passing amount plane characteristics of a mine field in different periods are researched to establish liquid passing amount equivalent graphs in different periods. The excess liquid amount is the sum of the liquid amount and the water injection amount, and in the water injection development process, the injected water with different properties from the fluids (crude oil and formation water) in the reservoir soaks and drives the reservoir for a long time to reform the reservoir, so that the microscopic properties of the reservoir generate physical and chemical effects, and the macroscopic parameters of the reservoir are changed. Therefore, the sum of the liquid amount in the selected area and the water injection amount. The flow proceeds to step 103.
At step 103, the log is used to interpret the reservoir permeability. And according to the information of the core well, performing secondary interpretation of well logging by using the well completion logging curve of each period, and interpreting the permeability of the reservoir. On the basis of well logging curve standardization and core depth homing, well logging fine interpretation models of reservoir parameters with different water periods are established, and fine interpretation of reservoir parameters of 8points/m in the whole area is completed. The flow proceeds to step 104.
At step 104, a three-dimensional time-varying model is built. And (3) utilizing the permeability explanation result of the drilled well in each period, carrying out constraint by using the excess fluid volume equivalent diagram in the period, and respectively establishing a time-varying model of the permeability parameter of the reservoir by adopting a deterministic and random modeling method. Namely, the permeability change rule of the coring well analysis is used for controlling, the permeability is secondarily explained by the well completion logging in different water-containing stages, and the permeability time-varying degree of the well point is reflected. And taking the liquid passing equivalent graph in the same period as a trend surface, and establishing a three-dimensional fine time-varying model of the reservoir to reflect the time-varying imbalance of the permeability of the whole reservoir.
By way of specific example (Sheng Tuo oil field Sheng-II region Es 8)1) The present invention is further illustrated.
Sheng Tuo oil field Sheng two district Es81Oil-containing area the oil-containing area is 12.0Km2Average effective thickness of 7.4m and geological reserve of 1373X 104t, original formation temperature of 86 ℃, produced water CaCl2Type, degree of mineralization 25800mg/L, degree of extraction 44.01%, and comprehensive water content 97.7%. The development is carried out in 1966 in 1 month, and the development of the method in nearly 50 years now enters the later stage of extra high water content, particularly major oil layer Es81Through strong injection and strong mining, under the action of fluid, particles and microstructures of a reservoir are changed, so that macroscopic parameters of the reservoir are changed, the change has imbalance in the plane and the longitudinal direction, the heterogeneity of the seepage performance of the reservoir is enhanced, the potential excavation difficulty is further increased, the heterogeneity of the permeability of the reservoir needs to be known, a three-dimensional time-varying model of the permeability of the reservoir is established, and a foundation is laid for comprehensive treatment and development effect improvement of the reservoir.
1. Study of permeability parameter time-varying law
And selecting the coring well data of the same well field, different periods and the same microphase type, and summarizing the permeability time-varying law of core analysis.
According to the research, the coring wells in different periods are optimized according to the lithological characteristics, the structural characteristics and the electrical characteristics of coring data, and 4 coring wells meeting the conditions, namely 2-5-17, 2-inspection 3-14, 2-1-inspection 1662 and 2-0-inclined inspection 313, are selected. The four wells are close to well sites, belong to estuary dam deposition, are similar in sand body development law and belong to four different water-containing stages. By comparison, the initial permeability is 621 × 10-3μm2And the permeability of the medium and high water-containing period is 679 multiplied by 10-3μm2High water cut period permeability 696X 10-3μm2744X 10 penetration rate of ultra-high water-cut period-3μm2(see table 1, fig. 2). The change rule of the permeability in the four stages is 1:1.09:1.12:1.20, and the permeability is obviously increased along with the development of water injection.
TABLE 1 statistic table for analyzing reservoir physical properties of two zones of Sheng-Tuo oil field at different time periods
2. Characterizing the over-liquid volume planar distribution at different times
And establishing a liquid passing plan of the region according to the oil well liquid quantity of the layer system and the water injection quantity of the water well.
3. Logging secondary interpretation of permeability parameters for wells completed at different times
According to the information of the core well, on the basis of well logging curve standardization and core depth homing, well logging fine interpretation models of reservoir parameters with different water periods are established, and fine interpretation of reservoir parameters of the whole area of 8points/m is completed.
(1) The well logging curve standardization aims to eliminate system errors of the well logging curve caused by non-geological factors, and the work mainly standardizes two curves of sound waves and conductivity.
(2) As shown in fig. 3, the core depth homing is to eliminate an error between the drilling depth and the logging depth, and the work mainly adopts a method of performing correlation comparison between core analysis data and a three-porosity logging curve. Select 14 standard wells.
(3) As shown in fig. 4 to 9, a permeability model is established by using a single correlation analysis of core analysis data according to the cored well data to establish a point-to-point correlation between permeability and porosity.
(4) And (4) logging secondary interpretation of the permeability parameters, and counting the change rule of the reservoir logging interpreted permeability parameters according to the time. Initial permeability of 732X 10-3μm2Middle water phase permeability 811X 10-3μm2High water cut period permeability 822X 10-3μm2Penetration rate of 843X 10 in ultra-high water-containing period-3μm2(Table 2)
TABLE 2 statistical table of well logging interpretation permeability of two zones of Sheng Tuo oil field at different periods
4. Establishment of three-dimensional time-varying model of reservoir permeability parameter
As shown in fig. 10 to 12, the time-varying models of the reservoir permeability parameters are respectively established by using deterministic modeling methods by using the current-period excess liquid volume equivalent maps as constraints.
Claims (6)
1. The method for establishing the reservoir permeability time-varying model for developing the dynamic constraint is characterized by comprising the following steps of:
step 1, researching the time-varying law of reservoir permeability at different water-containing stages;
step 2, representing the plane distribution of the liquid passing amount in different periods;
step 3, logging and secondarily explaining the permeability of the reservoir; and
step 4, establishing a three-dimensional time-varying model;
in the step 2, interpolation is carried out by utilizing the liquid passing amount of each well point in different periods, the plane characteristic research of the liquid passing amount of the mine in different periods is carried out, and an equivalent diagram of the liquid passing amount in different periods is established, wherein the liquid passing amount is the sum of the liquid amount and the water injection amount;
in step 4, the permeability change rule of the coring well analysis is used for controlling, the permeability is secondarily explained by logging of the completed wells in different water-containing stages, the permeability time-varying degree of the well point is reflected, the liquid passing amount equivalent graph in the same period is used as a trend surface, and a three-dimensional fine time-varying model of the reservoir is established to reflect the imbalance of the permeability time-varying of the whole reservoir.
2. The method for building a dynamically constrained reservoir permeability time-varying model according to claim 1, wherein in step 1, the development process is divided into four phases: before water injection, in a medium-high water-cut period, a high water-cut period and an extra-high water-cut period, the core wells in all periods are selected to be drilled in different water-cut periods and are researched by analyzing core data and logging data of the core wells, wherein the core wells are adjacent to well sites, belong to the same sedimentary microfacies type, have the same sand body development degree and are completely drilled in different water-cut periods.
3. The method for establishing the time-varying model of reservoir permeability for developing dynamic constraints as claimed in claim 2, wherein in step 1, statistics are performed on the difference of water-containing stages and the time-varying law of reservoir permeability, and the statistics of physical parameters of the four-stage core well show that: the permeability is continuously increased along with the influence of water injection scouring.
4. The method of claim 1, wherein in step 3, logging is performed to interpret reservoir permeability by using the log of completed wells at each time period according to the data of the coring wells.
5. The method for establishing the time-varying model of reservoir permeability for developing dynamic constraints as claimed in claim 4, wherein in step 3, on the basis of well logging curve standardization and core depth homing, well logging fine interpretation models of reservoir parameters with different water cut periods are established, and fine interpretation of reservoir parameters of the whole area of 8points/m is completed.
6. The method for building a time-varying model of reservoir permeability with dynamic constraints of claim 1, wherein in step 4, the interpretive well permeability at each time is used, the excess fluid volume equivalent map at the time is used for constraint, and the time-varying model of the reservoir permeability parameter is built by respectively adopting deterministic and stochastic modeling methods.
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| CN113704951B (en) * | 2020-05-22 | 2022-11-01 | 中国石油天然气股份有限公司 | Method and device for establishing permeability model |
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