CN109063228B - Method and device for determining water-drive reservoir water-containing rate-of-rise change - Google Patents
Method and device for determining water-drive reservoir water-containing rate-of-rise change Download PDFInfo
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Abstract
The invention provides a method and a device for determining water-drive reservoir water content rise rate change. The determination method comprises the following steps: determining the actual extraction degree and the water content of the oil reservoir, and drawing a scatter diagram of the actual extraction degree and the water content of the oil reservoir; fitting the actual extraction degree and the scatter diagram of the water content of the oil reservoir by using a relational expression of the extraction degree and the water content to obtain the initial water content of the oil reservoir, the extraction degree of the crude oil when the water content of the oil reservoir is the initial water content and the final recovery ratio of the crude oil when the water content of the oil reservoir is the limit water content; determining a relational expression of the water content increasing rate and the water content and a change rule of the water content increasing rate along with the extraction degree, and determining the change of the water content increasing rate of the water-drive reservoir. The invention also provides a device for determining the water-drive reservoir water content rise rate change. The method and the device of the invention consider the actual oil field production data and can more truly determine the change rule of the water content rising rate.
Description
Technical Field
The invention relates to a method for determining the change of the water-bearing rate of rise of an oil reservoir based on oil field production dynamic data, belonging to the technical field of oil reservoir development.
Background
The water cut rising rate and the extraction degree are important production indexes for oil field development, and the change of the water cut rising rate and the extraction degree reflects the water drive development effect of the oil field to a certain extent. The statistics of the actual production data of the oil field shows that a certain relationship exists between the water cut rising rate and the extraction degree of the water-driven oil reservoir, the specific relationship is the comprehensive reflection of the oil-water flow rule under the combined action of a plurality of factors in the oil field development, and the change condition of the water cut rising rate along with the extraction degree can be determined by using the relational expression of the water cut rising rate and the extraction degree. The relationship is not only dependent on reservoir parameters such as heterogeneity, fluid property, water body size and fluid distribution of a reservoir layer, but also related to artificial factors such as well pattern development, exploitation mode and working system, so that even oil fields with the same oil-water property have different relationships between the water content increase rate and the exploitation degree. In order to reasonably analyze and evaluate the development effect and the development degree of the oil field, plan development measures and the oil field yield according to the development measures and effectively guide the oil field development, a reasonable relational expression between the water cut rising rate and the extraction degree needs to be determined.
On the traditional water contentIn the technology of the rate of rise, an exponential expression is adopted on the basis of obtaining the relation data of oil-water two-phase permeability and water saturation through a laboratory
The processing method comprises the steps of calculating the relation between the permeability ratio and the water saturation, predicting the change of the water content and the water content increase rate by using a flow splitting equation, and further carrying out the water flooding effect evaluation and development index prediction. However, the calculation result and the actual data generate larger errors near two end points of the irreducible water saturation and the residual oil saturation, and the errors are reserved in the calculation process and are also substituted into the subsequent oil reservoir analysis, so that adverse effects are brought to the dynamic oil reservoir analysis and planning scheme compilation. In particular, the above-mentioned method for characterizing the relative permeability curve has the following disadvantages: firstly, the change of oil field development indexes at the low water content stage is inconsistent with a water flooding characteristic curve, the exponential expression of the oil-water relative permeability and the water saturation is not in a linear hough system, and the water content in the production of a mine field is increased more quickly; the relative permeability curve under a higher water injection multiple has a piecewise nonlinear characteristic, at the moment, the influence of the oil-water relative permeability ratio on the water content in actual production is small, the requirement on the characterization precision of the relative permeability curve at the stage is not high, and the change of oilfield development indexes conforms to the characteristic of a water flooding curve; and thirdly, oil reservoir seepage characteristics change in the ultra-high water content stage, a water drive characteristic curve upwarps, the exponential expression of the oil-water relative permeability and the water saturation is not in a complete linear relation any more, and the linear relation is only suitable for the middle section of the relative permeability curve and cannot represent the complete relative permeability curve.
In 2014, the relation between the oil-water relative permeability ratio and the water saturation is obtained based on a rock core displacement experiment (application number: 201410095426.X), and the relation between the water content rising rate and the extraction degree is obtained by utilizing a power method:
in the formula: f. ofwTo a reservoirWater content, R is the oil deposit extraction degree, SorAs residual oil saturation, SwiTo restrict water saturation, murAnd a and b are constants obtained by oil-water phase permeation curve regression fitting.
The method can predict the change of the water content rise rate of the oil field as long as the oil-water phase permeability curve is known, however, the actual water content change of the oil field is not only related to the oil-water phase permeability curve, but also has a great relation with the well pattern and the development mode of the oil field, the method cannot well reflect the actual production characteristics of the oil field, cannot be well used for the evaluation and index prediction of the water flooding development effect of the actual oil field, and has poor practicability.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a method for describing the water cut rising rate change rule based on the actual production data of an oil reservoir.
In order to achieve the technical purpose, the invention provides a method for determining the water-drive reservoir water-cut rate-of-rise change, which comprises the following steps:
determining the actual extraction degree and the water content of the oil reservoir, and drawing a scatter diagram of the actual extraction degree and the water content of the oil reservoir;
fitting a scatter diagram of the actual extraction degree and the water content by using a relational expression of the extraction degree and the water content to obtain the initial water content of the oil reservoir, the extraction degree of the crude oil when the water content of the oil reservoir is the initial water content, and the final recovery ratio of the crude oil when the water content of the oil reservoir is the ultimate water content;
and determining the change of the water-bearing rate of the water-drive reservoir according to the initial water content of the reservoir, the extraction degree of the crude oil when the water content of the reservoir is the initial water content, and the final recovery ratio of the crude oil when the water content of the reservoir is the limit water content to obtain a relational expression of the water-bearing rate of rise and the water content and a change rule of the water-bearing rate of rise along with the extraction degree.
In the determination method, during fitting, a relation between the extraction degree and the water content is used for fitting the actual scatter diagram of the extraction degree and the water content according to a nonlinear regression fitting mode.
In the determination method of the present invention, preferably, the relation between the water content increase rate and the water content is obtained according to the following formula:
wherein the content of the first and second substances,
is the water cut rate of rise;
fwthe water content of the oil reservoir;
fw0the initial water content of the oil reservoir;
fwLthe limiting water content of the oil reservoir is usually 0.98;
r is the extraction degree of the oil reservoir;
R0water content of oil reservoir is fw0The degree of crude oil production;
ERthe water content of the oil reservoir is the limit water content fwLThe ultimate recovery of crude oil;
c is a constant obtained by derivation with a power function of 10, and c is ln (10).
In the determination method of the present invention, preferably, the law of the water cut increase rate as a function of the degree of extraction is determined according to the following formula:
wherein the content of the first and second substances,
is the water cut rate of rise;
fwthe water content of the oil reservoir;
fw0the initial water content of the oil reservoir;
fwLthe limiting water content of the oil reservoir is usually 0.98;
r is the extraction degree of the oil reservoir;
R0water content of oil reservoir is fw0The degree of crude oil production;
ERthe water content of the oil reservoir is the limit water content fwLThe ultimate recovery of crude oil;
c is a constant obtained by derivation with a power function of 10, and c is ln (10).
In the determination method of the present invention, the relationship between the extraction degree and the water content is preferably as follows:
wherein f iswThe water content of the oil reservoir;
fw0the initial water content of the oil reservoir;
fwLthe limiting water content of the oil reservoir is usually 0.98;
r is the extraction degree of the oil reservoir;
R0water content of oil reservoir is fw0The degree of crude oil production;
ERthe water content of the oil reservoir is the limit water content fwLThe ultimate recovery of crude oil.
The method for determining the water-drive oil reservoir water content increase rate change is characterized in that on the basis of actual production data of an oil reservoir, a relational expression of water content and extraction degree of actual production characteristics of the oil reservoir is considered, a nonlinear regression fitting mathematical processing method is applied, and an initial water content, extraction degree and final recovery ratio which describe the actual water-drive characteristics of the oil reservoir and a corresponding relational expression of the water content and the extraction degree are obtained, so that a theoretical relational expression which reflects the oil field water content increase rate change is obtained.
The method for determining the change of the water cut-up rate of the water-drive reservoir can more truly determine the change rule of the water cut-up rate, and is particularly suitable for determining the change of the water cut-up rate of the reservoir meeting the B-type water-drive production curve.
The invention also provides a method for predicting the water drive development dynamics of the oil reservoir, which comprises the step of the method for determining the water-drive oil reservoir water-containing rise rate change.
In the prediction method of the present invention, preferably, the method includes the steps of:
by the method for determining the change of the water-cut rate of rise of the water-drive reservoir, a relational expression of the water-cut rate of rise and the water content and a change rule of the water-cut rate of rise along with the extraction degree are obtained;
and comparing the relational expression of the water content rising rate and the water content, the change rule of the water content rising rate along with the extraction degree, the actual relational data of the water content rising rate and the water content and the actual relational data of the water content rising rate and the extraction degree, and further analyzing the oil reservoir water drive development effect.
In the method for predicting the reservoir water drive development dynamics, if the actual water content rise rate data point is greater than the theoretical water content rise rate, the development effect is poor; if the actual water content rise rate data point is equal to the theoretical water content rise rate, the development effect is better; if the actual water content rising rate data point is smaller than the theoretical water content rising rate, the development effect is good.
According to the method for predicting the water-drive development dynamics of the oil reservoir, the relational expression of the water-containing rising rate and the water content and the change rule of the water-containing rising rate along with the extraction degree are obtained through the method for determining the water-containing rising rate change of the water-drive oil reservoir, and are compared with the actual parameters of the oil reservoir, so that the water-drive effect and the development characteristics of the oil reservoir are reasonably analyzed and evaluated, oil reservoir development measures and oil field yield are planned according to the water-drive effect and the water-drive development dynamics, and the remaining oil submergence and the oil reservoir development are effectively guided.
The invention also provides a device for determining the water-drive oilfield water content rise rate change, which comprises:
the actual data drawing module is used for determining the actual extraction degree and the water content of the oil reservoir and drawing a scatter diagram of the actual extraction degree and the water content of the oil reservoir;
the parameter determination module is used for fitting a scatter diagram of the actual extraction degree and the water content by using a relational expression of the extraction degree and the water content to obtain the initial water content of the oil reservoir, the extraction degree of the crude oil when the water content of the oil reservoir is the initial water content, and the final recovery ratio of the crude oil when the water content of the oil reservoir is the limit water content;
and the determining module is used for obtaining a relational expression of the water content increasing rate and the water content and a change rule of the water content increasing rate along with the extraction degree according to the initial water content of the oil reservoir, the extraction degree of the crude oil when the water content of the oil reservoir is the initial water content and the final recovery ratio of the crude oil when the water content of the oil reservoir is the limit water content, and determining the change of the water content increasing rate of the water-driven oil reservoir.
In the determination device of the present invention, preferably, the relational expression of the water content increase rate and the water content is obtained according to the following formula:
wherein the content of the first and second substances,
is the water cut rate of rise;
fwthe water content of the oil reservoir;
fw0the initial water content of the oil reservoir;
fwLthe limiting water content of the oil reservoir is usually 0.98;
r is the extraction degree of the oil reservoir;
R0water content of oil reservoir is fw0The degree of crude oil production;
ERthe water content of the oil reservoir is the limit water content fwLThe ultimate recovery of crude oil;
c is a constant obtained by derivation with a power function of 10, and c is ln (10).
In the determination apparatus of the present invention, preferably, the law of the water cut increase rate as a function of the degree of extraction is determined according to the following formula:
wherein the content of the first and second substances,
is the water cut rate of rise;
fwthe water content of the oil reservoir;
fw0the initial water content of the oil reservoir;
fwLthe limiting water content of the oil reservoir is usually 0.98;
r is the extraction degree of the oil reservoir;
R0water content of oil reservoir is fw0The degree of crude oil production;
ERthe water content of the oil reservoir is the limit water content fwLThe ultimate recovery of crude oil;
c is a constant obtained by derivation with a power function of 10, and c is ln (10).
In the determination device of the present invention, the relationship between the extraction degree and the water content is preferably as follows:
wherein f iswThe water content of the oil reservoir;
fw0the initial water content of the oil reservoir;
fwLthe limiting water content of the oil reservoir is usually 0.98;
r is the extraction degree of the oil reservoir;
R0water content of oil reservoir is fw0The degree of crude oil production;
ERthe water content of the oil reservoir is the limit water content fwLThe ultimate recovery of crude oil.
The device for determining the water-drive oil reservoir water-content increase rate change is characterized in that a relational expression of water content and extraction degree of the oil reservoir actual production characteristics is considered based on the actual production data of the oil reservoir, and a nonlinear regression fitting mathematical processing method is applied to obtain an initial water content, extraction degree and final recovery ratio which describe the oil reservoir actual water-drive characteristics and a corresponding relational expression of the water content and the extraction degree, so that a theoretical relational expression reflecting the oil reservoir water-content increase rate change is obtained.
The device for determining the change of the water cut-up rate of the water-drive reservoir can determine the change rule of the water cut-up rate more truly, and is particularly suitable for determining the change of the water cut-up rate of the reservoir meeting the B-type water-drive production curve.
The method and the device for determining the change of the water-cut rate of rise of the water-drive reservoir can more truly determine the change rule of the water-cut rate of rise of the water-cut reservoir based on the actual production data of the reservoir. Based on reservoir engineering and seepage mechanics theory, a general solution formula of the relation between the water content increase rate of the water-drive reservoir and the water content and the extraction degree is provided by combining with actual production data, a water content increase rate curve conforming to the actual oil field water-drive rule is drawn, and the actual oil field water-drive characteristic rule can be more accurately explained and analyzed and the future development index of the oil field can be predicted in theory and practice.
The method for predicting the water-drive development dynamics of the oil reservoir can reasonably analyze and evaluate the water-drive development effect of the oil reservoir based on the actual production data of the oil reservoir, plan the oil reservoir development measures and the oil reservoir yield and effectively guide the remaining oil submergence and the oil reservoir development by applying the method for determining the water-drive oil reservoir water-cut rate change.
Drawings
FIG. 1 is a schematic diagram of an apparatus for determining water drive reservoir water rate-of-rise change in an embodiment of the present invention;
FIG. 2 is a comparison curve between the water content and extraction degree relation curve and actual data in the embodiment of the present invention;
FIG. 3 is a graph of water cut rate of rise versus water cut versus actual data for an example of the present invention;
FIG. 4 is a comparison of water cut rate of rise versus production versus actual data for an example of the present invention.
Detailed Description
The technical solutions of the present invention will be described in detail below in order to clearly understand the technical features, objects, and advantages of the present invention, but the present invention is not limited to the practical scope of the present invention.
Example 1
The embodiment firstly provides a device for determining the water-drive reservoir water-cut rate-of-rise change, the structure of which is shown in fig. 1, and the device may include:
the actual data drawing module is used for determining the actual extraction degree and the water content of the oil reservoir and drawing a scatter diagram of the actual extraction degree and the water content of the oil reservoir;
the parameter determination module is used for fitting a scatter diagram of the actual extraction degree and the water content by using a relational expression of the extraction degree and the water content to obtain the initial water content of the oil reservoir, the extraction degree of the crude oil when the water content of the oil reservoir is the initial water content, and the final recovery ratio of the crude oil when the water content of the oil reservoir is the limit water content;
and the determining module is used for obtaining a relational expression of the water content increasing rate and the water content and a change rule of the water content increasing rate along with the extraction degree according to the initial water content of the oil reservoir, the extraction degree of the crude oil when the water content of the oil reservoir is the initial water content and the final recovery ratio of the crude oil when the water content of the oil reservoir is the limit water content, and determining the change of the water content increasing rate of the water-drive oil field.
The embodiment also provides a method for determining the water-drive reservoir water-cut rate-of-rise change, which may include the following steps:
firstly, the geology and the exploitation condition of an oil reservoir are considered, the production data of the oil field in the past development is obtained, the actual extraction degree, the water content and the water content rising rate data of the oil field are worked out and calculated according to the production data (table 1), and the water content and the extraction degree of the actual oil field are drawn in a coordinate system (scattered points in a graph 2) by taking the extraction degree as an abscissa and the water content as an ordinate.
TABLE 1
Secondly, according to a relational expression of the extraction degree and the water content, carrying out nonlinear regression fitting on the actual extraction degree and the water content data of the oil field in the graph 2 to obtain the initial water content of the oil reservoir, the extraction degree of the crude oil when the water content of the oil reservoir is the initial water content, and the final recovery ratio of the crude oil when the water content of the oil reservoir is the limit water content;
wherein, the relational expression of the extraction degree and the water content is as follows:
wherein f iswThe water content of the oil reservoir;
fw0the initial water content of the oil reservoir is 0.02;
fwLthe ultimate water content of the oil reservoir is 0.98;
r is the extraction degree of the oil reservoir;
R0water content of oil reservoir is fw0The crude oil extraction degree is 0;
ERthe water content of the oil reservoir is the limit water content fwLThe ultimate recovery ratio of crude oil was 0.2.
The relational expression between the extraction degree and the water content is as follows:
thirdly, based on the obtained parameter R0(R0＝0)、fw0(fw00.02) and ultimate recovery ER(ER0.2) according to the formula
The relational expression of the water-containing rate of rise and the water content of the oil field is obtained as follows:
wherein the content of the first and second substances,
is the water cut rate of rise; f. ofwThe water content of the oil reservoir; f. ofw0The initial water content of the oil reservoir; f. ofwLIs 0.98; r is the extraction degree of the oil reservoir; r0Water content of oil reservoir is fw0The degree of crude oil production; eRThe water content of the oil reservoir is the limit water content fwLUltimate recovery of crude oil, c ═ ln (10);
and according to a formula
Obtaining the change rule of the water content increasing rate along with the extraction degree, which is shown as the following formula:
the water cut is used as an abscissa, and the water cut rate of rise is used as an ordinate, and the water cut rate of rise, the actual value and the theoretical value of the water cut rate and the water cut rate of the oil reservoir of the embodiment are plotted in a coordinate system (figure 3); the actual value and the theoretical value of the water cut increase rate and the extraction degree of the oil reservoir of this example are plotted in a coordinate system (fig. 4) with the extraction degree as an abscissa and the water cut increase rate as an ordinate, and the change of the water cut increase rate of the water-drive oil reservoir is determined.
The embodiment further provides a method for predicting reservoir water drive development dynamics, and the method for predicting reservoir water drive development dynamics may include the following steps:
the relational expression between the water cut increase rate and the water content and the change rule of the water cut increase rate with the extraction degree obtained by the method of the embodiment are compared with the actual data of the relationship between the water cut increase rate and the water content and the actual data of the relationship between the water cut increase rate and the extraction degree, and the results are shown in fig. 3 and fig. 4.
It can be seen that the relation data points of the actual water content and the extraction degree of the oil field are basically located on the relation curve of the water content and the extraction degree of the embodiment, which shows that the goodness of fit of the two is good, namely the relation of the water content and the extraction degree of the invention can find the water drive rule of the actual oil reservoir; the water cut rising rate relation shows that the actual water content is greatly different from the theoretical value and is larger than the theoretical value in the early stage of oil reservoir development, which indicates that the water drive development effect in the early stage of oil reservoir is poor; and at the middle and later stages of development, the actual water content rise rate data point gradually tends to the theoretical curve and fluctuates near the theoretical curve, so that the oil reservoir water drive effect is improved, and a reliable reference guidance basis is provided for the establishment of an oil reservoir development adjustment scheme and the next residual oil excavation potential measure.
For convenience of description, the above devices are described as being divided into various units by function, and are described separately. Of course, the functions of the units may be implemented in the same software and/or hardware or in a plurality of software and/or hardware when implementing the invention.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include forms of volatile memory in a computer readable medium, Random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). Memory is an example of a computer-readable medium.
Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The invention may be described in the general context of computer-executable instructions, such as program modules, being executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types. The invention may also be practiced in distributed computing environments where tasks are performed by remote processing devices that are linked through a communications network. In a distributed computing environment, program modules may be located in both local and remote computer storage media including memory storage devices.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, as for the apparatus embodiment, since it is substantially similar to the method embodiment, the description is relatively simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
Claims (8)
1. A method for determining water-drive reservoir water-cut rate-of-rise change is characterized by comprising the following steps:
determining the actual extraction degree and the water content of the oil reservoir, and drawing a scatter diagram of the actual extraction degree and the water content of the oil reservoir;
fitting the actual extraction degree and the scatter diagram of the water content of the oil reservoir by using a relational expression of the extraction degree and the water content to obtain the initial water content of the oil reservoir, the extraction degree of the crude oil when the water content of the oil reservoir is the initial water content and the final recovery ratio of the crude oil when the water content of the oil reservoir is the limit water content;
obtaining a relational expression of water content increase rate and water content and a change rule of the water content increase rate along with the extraction degree according to the initial water content of the oil reservoir, the extraction degree of the crude oil when the water content of the oil reservoir is the initial water content and the final recovery ratio of the crude oil when the water content of the oil reservoir is the limit water content;
wherein the relational expression of the water cut rising rate and the water cut is obtained according to the following formula:
wherein the content of the first and second substances,
is the water cut rate of rise;
fwthe water content of the oil reservoir;
fw0the initial water content of the oil reservoir;
fwLthe ultimate water content of the oil reservoir;
r is the extraction degree of the oil reservoir;
R0water content of oil reservoir is fw0The degree of crude oil production;
ERthe water content of the oil reservoir is the limit water content fwLThe ultimate recovery of crude oil;
c is a constant obtained by derivation with a power function of 10, and c is ln (10).
2. The determination method according to claim 1, wherein the change rule of the water cut rising rate with the production degree is determined according to the following formula:
wherein the content of the first and second substances,
is the water cut rate of rise;
fwthe water content of the oil reservoir;
fw0the initial water content of the oil reservoir;
fwLthe ultimate water content of the oil reservoir;
r is the extraction degree of the oil reservoir;
R0water content of oil reservoir is fw0The degree of crude oil production;
ERthe water content of the oil reservoir is the limit water content fwLThe ultimate recovery of crude oil;
c is a constant obtained by derivation with a power function of 10, and c is ln (10).
3. The method of claim 1, wherein the extent of extraction is related to water cut by the following equation:
wherein f iswThe water content of the oil reservoir;
fw0the initial water content of the oil reservoir;
fwLthe ultimate water content of the oil reservoir;
r is the extraction degree of the oil reservoir;
R0water content of oil reservoir is fw0The degree of crude oil production;
ERthe water content of the oil reservoir is the limit water content fwLThe ultimate recovery of crude oil.
4. A method for predicting reservoir water drive development dynamics, the method comprising the steps of the method of determining of any one of claims 1 to 3.
5. The prediction method of claim 4, further comprising the steps of:
and comparing the relational expression of the water content rising rate and the water content and the change rule of the water content rising rate along with the extraction degree with the actual relational data of the water content rising rate and the water content and the actual relational data of the water content rising rate and the extraction degree, and further analyzing the oil reservoir water drive development effect.
6. A device for determining water drive reservoir water cut rate of rise change, the device comprising:
the actual data drawing module is used for determining the actual extraction degree and the water content of the oil reservoir and drawing a scatter diagram of the actual extraction degree and the water content of the oil reservoir;
the parameter determination module is used for fitting the actual extraction degree and the scatter diagram of the water content by using a relational expression of the extraction degree and the water content to obtain the initial water content of the oil reservoir, the extraction degree of the crude oil when the water content of the oil reservoir is the initial water content and the final recovery ratio of the crude oil when the water content of the oil reservoir is the limit water content;
the determining module is used for obtaining a relational expression of the water-cut rate of rise and the water content and a change rule of the water-cut rate of rise along with the extraction degree according to the initial water content of the oil reservoir, the extraction degree of the crude oil when the water content of the oil reservoir is the initial water content and the final recovery ratio of the crude oil when the water content of the oil reservoir is the limit water content, and determining the change of the water-cut rate of rise of the water-drive oil reservoir;
wherein the relational expression of the water cut rising rate and the water cut is obtained according to the following formula:
wherein the content of the first and second substances,
is the water cut rate of rise;
fwthe water content of the oil reservoir;
fw0the initial water content of the oil reservoir;
fwLthe ultimate water content of the oil reservoir;
r is the extraction degree of the oil reservoir;
R0water content of oil reservoir is fw0The degree of crude oil production;
ERthe water content of the oil reservoir is the limit water content fwLThe ultimate recovery of crude oil;
c is a constant obtained by derivation with a power function of 10, and c is ln (10).
7. The determination apparatus according to claim 6, wherein the water cut rate of rise with the degree of production is determined according to the following formula:
wherein the content of the first and second substances,
is the water cut rate of rise;
fwthe water content of the oil reservoir;
fw0the initial water content of the oil reservoir;
fwLthe ultimate water content of the oil reservoir;
r is the extraction degree of the oil reservoir;
R0water content of oil reservoir is fw0The degree of crude oil production;
ERthe water content of the oil reservoir is the limit water content fwLThe ultimate recovery of crude oil;
c is a constant obtained by derivation with a power function of 10, and c is ln (10).
8. The determination apparatus of claim 6, wherein the extent of extraction is related to water cut by the following equation:
wherein f iswThe water content of the oil reservoir;
fw0the initial water content of the oil reservoir;
fwLthe ultimate water content of the oil reservoir;
r is the extraction degree of the oil reservoir;
R0water content of oil reservoir is fw0The degree of crude oil production;
ERthe water content of the oil reservoir is the limit water content fwLThe ultimate recovery of crude oil.
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| CN104915512A (en) * | 2015-06-25 | 2015-09-16 | 陕西延长石油(集团)有限责任公司研究院 | Method for predicting recovery percentage and water cut of oil field |
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