CN109033508B - Method and device for determining water content and water content increase rate of oil reservoir - Google Patents
Method and device for determining water content and water content increase rate of oil reservoir Download PDFInfo
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Abstract
The invention provides a method and a device for determining the water content and the water content increase rate of an oil reservoir. 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 content and the water content increase rate of the oil reservoir. The method and the device of the invention consider the actual oil field production data, and can determine the water content and the water content increasing rate of the oil reservoir more truly.
Description
Technical Field
The invention relates to a method for determining the water content and the water content increase rate of an oil reservoir based on actual production data of the oil reservoir, and belongs to the technical field of oil reservoir exploitation.
Background
The water content, the water content increasing rate and the extraction degree are important production indexes for oil field development, and the changes of the water content, the water content increasing rate and the extraction degree reflect the quality of 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 relation exists between the water content and the water content increase rate of the water-driven oil reservoir and the extraction degree, the specific relation 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 content increase rate along with the extraction degree can be determined by using the relational expression of the water content and the water content increase rate and the extraction degree. The relationship is not only dependent on the reservoir parameters such as heterogeneity, fluid property, water body size and fluid distribution of the reservoir, but also dependent on human factors such as well pattern development, exploitation mode and working system, so that even in oil fields with the same oil-water property, the relationship between the water content and the water content increase rate and the exploitation degree is different. 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 development of the oil field, a reasonable water content and a relation between the water content increase rate and the extraction degree need to be determined.
In the traditional technology for calculating the water content rising rate, 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 are obtained by utilizing a power method and are respectively shown as the following two formulas:
in the formula (f)wThe water content of the oil reservoir; r is the oil reservoir production degree; sorResidual oil saturation; swiIrreducible water saturation; mu.srThe oil-water viscosity ratio; 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 determining the water content and the water cut increase rate of an oil reservoir based on the actual production data of the oil reservoir.
In order to achieve the technical purpose, the invention provides a method for determining the water content and the water content increase rate of an oil reservoir, 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 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;
and determining the water content and the water content increase rate of the water-driven oil reservoir according to the initial water content of the oil reservoir, the crude oil extraction degree 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 to obtain a relational expression between the water content increase rate and the water content and a change rule of the water content increase rate 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 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 degree of crude oil production;
ERthe water content of the oil reservoir is the limit water content fwLThe ultimate recovery of crude oil.
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 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 degree of crude oil production;
ERthe water content of the oil reservoir is the limit water content fwLThe ultimate recovery of crude oil.
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 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 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 content and the water content increase rate of the oil reservoir is based on the actual production data of the oil reservoir, considers the relation between the water content and the extraction degree of the actual production characteristics of the oil field, and applies a nonlinear regression fitting mathematical processing method to obtain the relation between the initial water content, the extraction degree and the final recovery rate which describe the actual water flooding characteristics of the oil reservoir and the corresponding water content and extraction degree, so as to obtain the theoretical relation which reflects the water content and the water content increase rate of the oil reservoir.
The method for determining the water content and the water content increase rate of the oil reservoir can determine the water content and the water content increase rate more truly, and is particularly suitable for determining the water content and the water content increase rate of the oil reservoir meeting the C-type water flooding production curve.
The invention also provides a method for predicting the water drive development dynamics of the oil reservoir, which comprises the steps of the method for determining the water content and the water content increase rate of the oil reservoir.
In the prediction method of the present invention, preferably, the method includes the steps of:
by the method for determining the water content and the water content rise rate of the oil reservoir, a relational expression of the water content rise rate and the water content and a change rule of the water content rise rate 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 cut rise rate data point is greater than the theoretical water cut 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 content and the water content increase rate of an oil reservoir, 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 determining the water content and the water content increasing rate of the water-drive oil reservoir according to the initial water content of the oil reservoir, the crude oil extraction degree 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 to obtain a relational expression between the water content increasing rate and the water content and a change rule of the water content increasing rate along with the extraction degree.
In the apparatus of the present invention, preferably, the relationship between the water cut content and the water cut 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 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.
In the apparatus of the present invention, preferably, the water cut rate of rise with 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 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 degree of crude oil production;
ERthe water content of the oil reservoir is the limit water content fwLThe ultimate recovery of crude oil.
In the apparatus 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 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 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 content and the water content increase rate of the oil reservoir is based on the actual production data of the oil reservoir, considers the relation between the water content and the extraction degree of the actual production characteristic of the oil reservoir, and applies a nonlinear regression fitting mathematical processing method to obtain the initial water content, the extraction degree, the final recovery ratio and the corresponding relation between the water content and the extraction degree which describe the actual water flooding characteristic of the oil reservoir, so as to obtain the theoretical relation reflecting the water content and the water content increase rate of the oil reservoir.
The device for determining the water content and the water content increasing rate of the oil reservoir can determine the water content and the water content increasing rate more truly, and is particularly suitable for determining the water content and the water content increasing rate of the oil reservoir meeting the C-type water drive production curve.
The method and the device for determining the water content and the water content increase rate of the oil reservoir are based on oil reservoir engineering and seepage mechanics theory, are combined with actual production data, provide a general solution formula of the relation between the water content and the extraction degree of the water-drive oil reservoir and the relation between the water content increase rate and the water content and the extraction degree, draw a water content and water content increase rate curve which is consistent with the actual oil field water-drive rule, and can more accurately explain and analyze the actual oil field water-drive characteristic rule and predict the future development index of the oil field 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 content and the water-containing rise rate of the oil reservoir.
Drawings
FIG. 1 is a schematic diagram of an apparatus for determining water cut and water rise rate of a reservoir in accordance with 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 cut and the water rise rate of a reservoir, the structure of which is shown in fig. 1, and the device can comprise:
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.
The embodiment also provides a method for determining the water content and the water content increase rate of the oil reservoir, which comprises the following steps:
firstly, the geology and the exploitation condition of an oil reservoir are considered, production data of the oil field in the past development are obtained, actual extraction degree, water content and 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 fig. 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 production degree was 0.48;
ERthe water content of the oil reservoir is the limit water content fwLThe ultimate recovery of crude oil was 0.69.
The relational expression between the extraction degree and the water content is as follows:
thirdly, based on the obtained parameter R0(R0＝0.48)、fw0(fw00.02) and ultimate recovery ER(ER0.69) 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 fwLThe ultimate recovery of crude oil;
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, so as to obtain the water content and the water cut increase rate of the oil reservoir.
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 coincidence degree of the two is good, namely, the relation formula of the water content and the extraction degree provided by the invention can be used for inventing the water drive rule of the oil field of the embodiment; as can be seen from the relationship of the water content rising rate, the water content rising rate value cannot be calculated because water is not produced in the early stage of oil reservoir development; and at the middle and later stages of oil reservoir development, the extraction degree reaches about 50%, water production is started, the water content rapidly rises, and the actual water content rise rate data point basically fluctuates on or near a theoretical curve, so that the water drive effect of the oil field becomes good, and a reliable reference guidance basis is provided for the establishment of an oil field 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 (7)
1. A method for determining the water content and the water content increase rate of an oil reservoir 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;
the relational expression of the extraction degree and the water content is shown as the following formula:
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;
and determining the water content and the water content increase rate of the water-drive oil reservoir according to the initial water content of the oil reservoir, the crude oil extraction degree 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 to obtain a relational expression of the water content increase rate and the water content and a change rule of the water content increase rate along with the extraction degree.
2. The determination method according to claim 1, wherein the relation of the moisture content increase rate to the moisture 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 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.
3. 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.
4. A method for predicting reservoir water drive development dynamics is characterized by comprising the following steps:
obtaining a relational expression of the water content rising rate and the water content and a change rule of the water content rising rate along with the extraction degree by the determination method of any one of claims 1 to 3;
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.
5. An apparatus for determining a water cut and a water rise rate of a reservoir, the apparatus 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 relational expression of the extraction degree and the water content is shown as the following formula:
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;
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 water content and the water content increasing rate of the water-driven oil reservoir.
6. The determination apparatus according to claim 5, wherein the relationship between the moisture content increase rate and the moisture 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 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.
7. The determination apparatus according to claim 5, 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.
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