CN112183800B - Method and device for predicting recoverable reserves of crude oil of water-drive reservoir - Google Patents
Method and device for predicting recoverable reserves of crude oil of water-drive reservoir Download PDFInfo
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Abstract
The invention provides a method and a device for predicting the crude oil recoverable reserves of a water-drive reservoir, wherein the method comprises the steps of determining the exploitation mode and the geological features of an oil field and collecting historical production data in the development of the oil field; drawing a relation graph between the water content and the accumulated oil yield by taking the water content in the production data as an ordinate and the accumulated oil yield as an abscissa, and performing nonlinear regression fitting on the water content and the accumulated oil yield data to obtain a mathematical model of the accumulated oil yield and the water content matched with an oil field; and determining the recoverable reserves of the crude oil of the water-drive reservoir according to the mathematical model of the accumulated oil yield and the water content. The method provided by the invention can predict the change of accumulated oil yield along with the water content in the water-flooding field, and can calculate the recoverable reserves of the oil field, and the method is more in line with the actual oil reservoir, and has high practicability and high reliability; the method is favorable for evaluating the existing development effect of the oil field and guiding the implementation of the residual oil mining measures in the later period of the oil field, thereby improving the economic benefit of the water-flooding field development.
Description
Technical Field
The invention relates to a method and a device for predicting the recoverable reserves of crude oil of a water-drive reservoir, belonging to the technical field of reservoir exploitation engineering in oilfield development.
Background
The recoverable oil reservoir is an important index for oil field development, and the size of the recoverable oil reservoir determines to a certain extent whether an oil field has development value or is effectively developed. As the field is continuously known, the recoverable reserves of the field change. The size of the recoverable reserves is related to the static parameters of the oil reservoir such as the thickness, the porosity and the heterogeneity of the oil reservoir, the property of the fluid, the size of the water body, the distribution of the fluid and the like, and is also related to artificial factors such as well pattern development, exploitation modes, working systems and the like. The statistics of actual production data of the oil field proves that a certain relationship exists between the water content of any water flooding oil reservoir and the accumulated oil yield, the concrete relationship is the comprehensive reflection of the oil-water flow law under the combined action of a plurality of factors in oil field development, and the recoverable oil yield of the oil field can be calculated by utilizing the relationship between the accumulated oil yield and the water content.
In order to accurately calculate the water flooding recoverable reserves of an oil field, a reasonable recoverable reserve and water content relation formula needs to be determined. In the industrial standard petroleum recoverable reserves calculation method (SY/T5367-2010) of China, the following four recoverable reserves expressions are proposed:
1) Characteristic curve of A-type water drive
The relation between the accumulated water production and the accumulated oil production is as follows:
lgW p ＝a 1 +b 1 N p formula 1;
the expression of the recoverable reserves is:
in formula 1 and formula 2: w (W) p The accumulated water yield of the oil field is ten thousand tons; n (N) p The accumulated oil production of the oil field is ten thousand tons; n (N) pt Is the recoverable reserve of the oil field, and is ten thousand tons; f (f) wL F (decimal) is the ultimate water content of the oil field; a, a 1 And b 1 Is constant.
2) Characteristic curve of B-type water drive
The relation between the accumulated water production and the accumulated oil production is as follows:
lgL p ＝a 2 +b 2 N p formula 3;
the expression of the recoverable reserves is:
in formula 3 and formula 4: l (L) p The accumulated liquid yield of the oil field is ten thousand tons; n (N) p The accumulated oil production of the oil field is ten thousand tons; n (N) pt Is the recoverable reserve of the oil field, and is ten thousand tons; f (f) wL F (decimal) is the ultimate water content of the oil field; a, a 2 And b 2 Is constant.
3) Characteristic curve of C-type water drive
The relation between the accumulated water production and the accumulated oil production is as follows:
the expression of the recoverable reserves is
In formula 5 and formula 6: l (L) p The accumulated liquid yield of the oil field is ten thousand tons; n (N) p The accumulated oil production of the oil field is ten thousand tons; n (N) pt Is the recoverable reserve of the oil field, and is ten thousand tons; f (f) wL F (decimal) is the ultimate water content of the oil field; a, a 3 And b 3 Is constant.
4) T-shaped water drive characteristic curve
The relation between the accumulated water production and the accumulated oil production is as follows:
the expression of the recoverable reserves is:
in formula 7 and formula 8: l (L) p The accumulated liquid yield of the oil field is ten thousand tons; n (N) p The accumulated oil production of the oil field is ten thousand tons; w (W) p The accumulated water yield of the oil field is ten thousand tons; n (N) pt Is the recoverable reserve of the oil field, and is ten thousand tons; f (f) wL Is the ultimate water content of the oil field, f(decimal); a, a 4 And b 4 Is constant.
As can be seen from the existing relation between the recoverable reserves and the water content, the method mainly has the following problems: 1) Only when a certain linear relation exists among accumulated oil production, accumulated liquid production and accumulated water production of the oil field, the recoverable reserves of the oil field can be calculated by utilizing the formula; 2) After the linear relation among the accumulated oil production, the accumulated liquid production and the accumulated water production of the oil field is determined, namely, the coefficients in the formula are determined, the recoverable reserves are only related to the limit water content according to the computational formula of the recoverable reserves, which is obviously unreasonable, because the recoverable reserves of the oil field change at any time along with the continuous development and knowledge of the oil field; 3) The conditions of the accumulated oil production, the accumulated liquid production and the accumulated water production of the oil field meeting the linear relation of the existing formulas are different, so that people cannot determine when to calculate the recoverable reserves by using the corresponding formulas, and therefore the applicability is poor; 4) Since the cumulative amount is often much greater than the instantaneous amount, the above formula yields the recoverable reserves based on the cumulative amount, which does not reflect the law of variation of the recoverable reserves during production.
Therefore, providing a novel method and device for predicting the recoverable oil reserves of water-drive reservoirs has become a technical problem to be solved in the art.
Disclosure of Invention
In order to solve the above-mentioned drawbacks and disadvantages, an object of the present invention is to provide a method for predicting the recoverable oil reserves of crude oil in a water-displacement reservoir. The method provided by the invention not only can explain and analyze the actual oilfield water flooding characteristic law more accurately in theory, but also can predict oilfield development indexes more accurately.
Another object of the invention is to provide a device for predicting the recoverable reserves of crude oil in a water-displacement reservoir.
It is yet another object of the present invention to provide a computer device.
Still another object of the present invention is to provide a computer-readable storage medium.
To achieve the above object, in one aspect, the present invention provides a method for predicting a recoverable oil reserve of a crude oil of a water-flooding reservoir, wherein the method for predicting the recoverable oil reserve of the crude oil of the water-flooding reservoir comprises:
step 1, determining exploitation modes and geological features of an oil field, and collecting historical production data in oil field development;
step 2, drawing a relation diagram between the water content and the accumulated oil yield by taking the water content in the production data as an ordinate and the accumulated oil yield as an abscissa, and performing nonlinear regression fitting on the water content and the accumulated oil yield data to obtain a mathematical model of the accumulated oil yield and the water content matched with the oil field;
and step 3, determining the recoverable reserves of the crude oil of the water-drive reservoir according to the mathematical model of the accumulated oil yield and the water content.
According to a specific embodiment of the present invention, in the method, preferably, the production data in step 1 includes annual oil production, cumulative liquid production, and water content data.
According to an embodiment of the present invention, in the method, more preferably, the production data in step 1 includes a cumulative oil production and a water content.
According to the specific embodiment of the invention, in the method, preferably, in the step 2, the water content is taken as an ordinate, the accumulated oil yield is taken as an abscissa, a relation diagram between the water content and the accumulated oil yield is drawn, and nonlinear regression fitting is performed on the water content and the accumulated oil yield data according to the following formula 9, so as to obtain a mathematical model of the accumulated oil yield and the water content matched with the oil field;
in formula 9: f (f) w The water content of the oil field is the ratio of the water yield to the liquid yield, and the unit is decimal, f; f (f) w0 The initial water content of the oil field is in decimal, and f; f (f) wL The unit is decimal, f, which is the ultimate water content of the oil field; n (N) p The unit is ten thousand tons or tons for accumulated oil production of the oil field; n (N) p0 For the water content of the oil field to be f w0 The unit of accumulated oil production is ten thousand tons or tons; n (N) pt For the water content of the oil field to be f wL The unit of accumulated oil production is ten thousand tons or tons.
According to a specific embodiment of the present invention, in the method, preferably, in step 3, the determining the recoverable oil reserve of the water-reservoir crude oil according to the mathematical model of the accumulated oil yield and the water content includes:
and when the water content in the mathematical model of the accumulated oil yield and the water content is the limit water content, the accumulated oil yield of the oil field corresponding to the mathematical model of the accumulated oil yield and the water content is the crude oil recoverable reserves of the water-drive reservoir.
According to a specific embodiment of the present invention, preferably, the method further comprises: and establishing a curve plate of the accumulated oil yield and the water content under different crude oil recoverable reserves according to the mathematical model of the accumulated oil yield and the water content. Wherein, the change rule of accumulated oil yield and water content can be found visually according to the plate.
The water content and the accumulated oil yield are two important development indexes in the development process of the oil field, the changes between the two important development indexes reflect the production dynamic and development effects of the oil field, the flow rule of oil and water in an oil reservoir is indirectly reflected, and corresponding adjustment measures can be formulated for the development of the oil field according to the accumulated oil yield and the water content changes to guide the oil field to develop more efficiently and reasonably. The relation between the accumulated oil yield and the water content can be used for predicting development dynamic parameters such as the water content of the oil reservoir and the like, and also can be used for predicting the recoverable reserve of the oil reservoir. The method for predicting the crude oil recoverable reserves of the water displacement reservoir is based on actual production data of the oil field, a regression fitting method and a mapping method are utilized to obtain a relation formula of accumulated oil yield and water content matched with the actual oil field, and the change rule of the accumulated oil yield and the water content of the oil field can be quantitatively determined based on the relation formula, and the change rule of the accumulated oil yield along with the water content can be reasonably predicted; meanwhile, based on the relation between the accumulated oil yield and the water content, the invention also establishes curve plates under different recoverable reserves, and draws the actual production data of the oil field to a theoretical plate for matching, thereby analyzing the development effect of the oil field and guiding future development and adjustment.
In another aspect, the present invention also provides a device for predicting the recoverable reserves of crude oil in a water-flooding reservoir, where the device for predicting the recoverable reserves of crude oil in a water-flooding reservoir includes:
the data collection module is used for determining the exploitation mode and geological features of the oil field and collecting historical production data in the development of the oil field;
the data fitting and model building module is used for drawing a relation diagram between the water content and the accumulated oil yield by taking the water content in the production data as an ordinate and the accumulated oil yield as an abscissa, and carrying out nonlinear regression fitting on the water content and the accumulated oil yield data to obtain a mathematical model of the accumulated oil yield and the water content matched with the oil field;
and the crude oil recoverable reserves determining module is used for determining the crude oil recoverable reserves of the water-drive reservoir according to the accumulated oil yield and water content mathematical model.
According to a specific embodiment of the present invention, in the apparatus, preferably, the production data includes annual oil production, accumulated liquid production, and water content data.
According to an embodiment of the present invention, in the apparatus, more preferably, the production data includes a cumulative oil production and a water content.
In the apparatus according to the embodiment of the present invention, preferably, the data fitting and model building module is specifically configured to:
drawing a relation diagram between the water content and the accumulated oil yield by taking the water content as an ordinate and the accumulated oil yield as an abscissa, and carrying out nonlinear regression fitting on the water content and the accumulated oil yield data according to the following formula 9 to obtain a mathematical model of accumulated oil yield and water content matched with an oil field;
in formula 9: f (f) w The water content of the oil field is the ratio of the water yield to the liquid yield, and the unit is decimal, f; f (f) w0 Initial water content for oil fieldThe rate, in decimal, f; f (f) wL The unit is decimal, f, which is the ultimate water content of the oil field; n (N) p The unit is ten thousand tons or tons for accumulated oil production of the oil field; n (N) p0 For the water content of the oil field to be f w0 The unit of accumulated oil production is ten thousand tons or tons; n (N) pt For the water content of the oil field to be f wL The unit of accumulated oil production is ten thousand tons or tons.
In the apparatus according to the embodiment of the present invention, preferably, the crude oil recoverable reserves determining module is specifically configured to:
and when the water content in the mathematical model of the accumulated oil yield and the water content is the limit water content, the accumulated oil yield of the oil field corresponding to the mathematical model of the accumulated oil yield and the water content is the crude oil recoverable reserves of the water-drive reservoir.
According to a specific embodiment of the present invention, preferably, the apparatus further comprises a plate creation module, specifically for:
and establishing a curve plate of the accumulated oil yield and the water content under different crude oil recoverable reserves according to the mathematical model of the accumulated oil yield and the water content.
In yet another aspect, the present invention further provides a computer device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor implements the method of predicting crude oil recoverable reserves of a water reservoir described above when executing the computer program.
In yet another aspect, the present invention also provides a computer readable storage medium storing a computer program for performing the above method of predicting crude oil recoverable reserves of a water reservoir.
The invention provides a novel relation between accumulated oil yield and water content and provides a calculation method of recoverable reserves based on actual production dynamic and static data of an oil field by using a nonlinear regression fitting method and a mapping method. By comparing the accumulated oil yield value (solid line in fig. 4) calculated by the method provided by the invention with the accumulated oil yield obtained by actual oil field data, the data points of the relationship between the accumulated oil yield and the water content of the actual oil field are basically located on the relationship between the accumulated oil yield and the water content calculated by the invention, which indicates that the theoretical curve obtained by the invention has high coincidence with the actual data, thereby verifying the accuracy of the model and the method for the accumulated oil yield and the water content.
The method provided by the invention can predict the change of accumulated oil yield along with the water content in the water-flooding field, and can calculate the recoverable reserves of the oil field, and the method is more in line with the actual oil reservoir, and has high practicability and high reliability; the method is favorable for evaluating the existing development effect of the oil field and guiding the implementation of the residual oil mining measures in the later period of the oil field, thereby improving the economic benefit of the water-flooding field development.
In addition, the invention provides three modes for obtaining the water flooding recoverable reserves, namely nonlinear regression fitting, formula calculation and a drawing method, and the change rule of the accumulated oil yield and the water content can be visually known and analyzed through the drawing method, so that the evaluation of the oil field development effect is facilitated.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for the description of the embodiments will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a specific process flow diagram of the method for predicting the recoverable oil reserve of a water-displacement reservoir according to an embodiment of the present invention.
FIG. 2 is a schematic diagram of the apparatus for predicting crude oil recoverable reserves in a water-reservoir according to an embodiment of the present invention.
FIG. 3 is a schematic structural diagram of the apparatus for predicting crude oil recoverable reserves in a water-reservoir according to another embodiment of the present invention.
FIG. 4 is a graph of cumulative oil production versus water content and a comparison of the graph with actual oil field data obtained in the examples of the present invention.
Detailed Description
In order to make the technical features, objects and advantageous effects of the present invention more clearly understood, the technical aspects of the present invention will now be described in detail with reference to the following specific examples, but should not be construed as limiting the scope of the present invention.
FIG. 1 is a process flow diagram of a method for predicting the recoverable oil reserves of a water-displacement reservoir according to an embodiment of the present invention, as shown in FIG. 1, the method comprising the steps of:
step S1, determining exploitation modes and geological features of an oil field, and collecting historical production data in oil field development;
s2, drawing a relation diagram between the water content and the accumulated oil yield by taking the water content in the production data as an ordinate and the accumulated oil yield as an abscissa, and performing nonlinear regression fitting on the water content and the accumulated oil yield data to obtain a mathematical model of the accumulated oil yield and the water content matched with an oil field;
and S3, determining the recoverable reserves of the crude oil of the water-drive reservoir according to the mathematical model of the accumulated oil yield and the water content.
In one embodiment, in step 2, the water content is taken as an ordinate and the accumulated oil yield is taken as an abscissa, a relation diagram between the water content and the accumulated oil yield is drawn, and nonlinear regression fitting is performed on the water content and the accumulated oil yield data according to the following formula 9, so as to obtain a mathematical model of the accumulated oil yield and the water content matched with the oil field;
in formula 9: f (f) w The water content of the oil field is the ratio of the water yield to the liquid yield, and the unit is decimal, f; f (f) w0 The initial water content of the oil field is in decimal, and f; f (f) wL The unit is decimal, f, which is the ultimate water content of the oil field; n (N) p The unit is ten thousand tons or tons for accumulated oil production of the oil field; n (N) p0 For the water content of the oil field to be f w0 The unit of accumulated oil production is ten thousand tons or tons; n (N) pt For the water content of the oil field to be f wL The unit of accumulated oil production is ten thousand tons or tons.
In one embodiment, in step 3, the determining the recoverable oil reserve of the oil-in-water reservoir according to the mathematical model of the accumulated oil yield and the water content includes:
and when the water content in the mathematical model of the accumulated oil yield and the water content is the limit water content, the accumulated oil yield of the oil field corresponding to the mathematical model of the accumulated oil yield and the water content is the crude oil recoverable reserves of the water-drive reservoir.
In one embodiment, the method further comprises: and establishing a curve plate of the accumulated oil yield and the water content under different crude oil recoverable reserves according to the mathematical model of the accumulated oil yield and the water content.
The method provided by the embodiment of the invention is specifically described below in connection with a calculation process of the water flooding recoverable reserves of Daqing Sabei oilfield:
firstly, examining the geology and exploitation condition of an oil reservoir to obtain production data of an oil field in past development;
then, according to the above production data, the actual accumulated oil yield and water content data of the oil field for 25 years are obtained (shown in table 1);
next, the water content of the actual oil field and the accumulated oil production are plotted in a coordinate system (scattered points in fig. 4) with the accumulated oil production as an abscissa and the water content as an ordinate.
Table 1 Daqing salsa north oil field production data
Thirdly, performing nonlinear regression fitting on the actual accumulated oil production and water content data of the oil field in fig. 4 by using a computer so as to determine a parameter N corresponding to the oil field in the formula 9 p0 (example N) p0 =0) and f w0 (example f) w0 =0.15) and the limit water content f wL (example f) wL A value of 0.98), namely, the accumulated oil yield N pt (N of the present example) pt =1432 ten thousand tons) to obtain the relation between accumulated oil yield and water content reflecting the development effect of the water flooding of the oil fieldThe formula is shown in the following formula 10 (the obtainable storage amount is 1432 ten thousand tons by taking the limit water content to be 0.98 by the following formula 10):
finally, the theoretical value (formula 10) of the accumulated oil yield and the water content of the oil field of the example is drawn in a coordinate system (as shown by a curve in fig. 4) by taking the accumulated oil yield as an abscissa and the water content as an ordinate, so that a reservoir engineer can be helped to analyze the change rule of the accumulated oil yield and the water content of the oil field, further evaluate the oil field development effect and predict the oil field water drive development index.
Based on the same inventive concept, the embodiment of the invention also provides a device for predicting the recoverable oil reserves of the water-drive reservoir, as described in the following implementation. Because the principles of solving the problems are similar to those of predicting the recoverable reserves of crude oil in water-displacement reservoirs, the implementation of the device can be referred to the implementation of the method, and the repetition is omitted.
Fig. 2 is a schematic structural diagram of an apparatus for predicting crude oil recoverable reserves of a water-displacement reservoir according to an embodiment of the present invention, as shown in fig. 2, the apparatus includes:
a data collection module 201, configured to determine an exploitation manner of an oilfield and geological features of the oilfield, and collect historical production data in development of the oilfield;
the data fitting and model establishing module 202 is configured to draw a relationship diagram between the water content and the accumulated oil yield in the production data as an ordinate and the accumulated oil yield as an abscissa, and perform nonlinear regression fitting on the water content and the accumulated oil yield data to obtain a mathematical model of accumulated oil yield and water content matched with the oil field;
the crude oil recoverable reserves determining module 203 is configured to determine the crude oil recoverable reserves of the water-drive reservoir according to the mathematical model of the accumulated oil yield and the water content.
In one embodiment, the production data includes annual oil production, cumulative liquid production, and water cut data.
In one embodiment, the production data includes cumulative oil production and water cut.
In one embodiment, the data fitting and model building module is specifically configured to:
drawing a relation diagram between the water content and the accumulated oil yield by taking the water content as an ordinate and the accumulated oil yield as an abscissa, and carrying out nonlinear regression fitting on the water content and the accumulated oil yield data according to the following formula 9 to obtain a mathematical model of accumulated oil yield and water content matched with an oil field;
in formula 9: f (f) w Is the water content of the oil field; f (f) w0 The initial water content of the oil field; f (f) wL Is the ultimate water content of the oil field; n (N) p The unit is ten thousand tons or tons for accumulated oil production of the oil field; n (N) p0 For the water content of the oil field to be f w0 The unit of accumulated oil production is ten thousand tons or tons; n (N) pt For the water content of the oil field to be f wL The unit of accumulated oil production is ten thousand tons or tons.
In one embodiment, the crude oil recoverable reserves determination module is specifically configured to:
and when the water content in the mathematical model of the accumulated oil yield and the water content is the limit water content, the accumulated oil yield of the oil field corresponding to the mathematical model of the accumulated oil yield and the water content is the crude oil recoverable reserves of the water-drive reservoir.
In one embodiment, the apparatus (as shown in fig. 3) further includes a plate creation module 204, specifically configured to:
and establishing a curve plate of the accumulated oil yield and the water content under different crude oil recoverable reserves according to the mathematical model of the accumulated oil yield and the water content.
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 flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations 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.
The foregoing description of the embodiments of the invention is not intended to limit the scope of the invention, so that the substitution of equivalent elements or equivalent variations and modifications within the scope of the invention shall fall within the scope of the patent. In addition, the technical features and the technical features, the technical features and the technical invention can be freely combined for use.
Claims (10)
1. A method of predicting the recoverable reserves of crude oil in a water-flooding reservoir, the method comprising:
step 1, determining exploitation modes and geological features of an oil field, and collecting historical production data in oil field development;
step 2, drawing a relation diagram between the water content and the accumulated oil yield by taking the water content in the production data as an ordinate and the accumulated oil yield as an abscissa, and carrying out nonlinear regression fitting on the water content and the accumulated oil yield data according to the following formula 9 to obtain a mathematical model of the accumulated oil yield and the water content matched with the oil field;
in formula 9: f (f) w Is the water content of the oil field; f (f) w0 The initial water content of the oil field; f (f) wL Is the ultimate water content of the oil field; n (N) p The unit is ten thousand tons or tons for accumulated oil production of the oil field; n (N) p0 For the water content of the oil field to be f w0 The unit of accumulated oil production is ten thousand tons or tons; n (N) pt For the water content of the oil field to be f wL The unit of accumulated oil production is ten thousand tons or tons;
and 3, determining the recoverable reserves of the crude oil of the water-drive reservoir according to the mathematical model of the accumulated oil yield and the water content, wherein the method comprises the following steps:
and when the water content in the mathematical model of the accumulated oil yield and the water content is the limit water content, determining the accumulated oil yield of the oil field corresponding to the mathematical model of the accumulated oil yield and the water content as the crude oil recoverable reserves of the water displacement reservoir.
2. The method of claim 1, wherein the production data in step 1 comprises annual oil production, cumulative liquid production, and water cut data.
3. The method of claim 1, wherein the production data in step 1 comprises cumulative oil production and water content.
4. The method according to claim 1, characterized in that the method further comprises: and establishing a curve plate of the accumulated oil yield and the water content under different crude oil recoverable reserves according to the mathematical model of the accumulated oil yield and the water content.
5. A device for predicting the recoverable reserves of crude oil in a water-flooding reservoir, the device for predicting the recoverable reserves of crude oil in a water-flooding reservoir comprising:
the data collection module is used for determining the exploitation mode and geological features of the oil field and collecting historical production data in the development of the oil field;
the data fitting and model building module is used for drawing a relation diagram between the water content and the accumulated oil yield by taking the water content in the production data as an ordinate and the accumulated oil yield as an abscissa, and carrying out nonlinear regression fitting on the water content and the accumulated oil yield data according to the following formula 9 to obtain a mathematical model of the accumulated oil yield and the water content matched with the oil field;
in formula 9: f (f) w Is the water content of the oil field; f (f) w0 The initial water content of the oil field; f (f) wL Is the ultimate water content of the oil field; n (N) p The unit is ten thousand tons or tons for accumulated oil production of the oil field; n (N) p0 For the water content of the oil field to be f w0 The unit of accumulated oil production is ten thousand tons or tons; n (N) pt For the water content of the oil field to be f wL The unit of accumulated oil production is ten thousand tons or tons;
and the crude oil recoverable reserves determining module is used for determining the recoverable reserves of the crude oil of the water-flooding reservoir according to the accumulated oil yield and water content mathematical model, and particularly determining the accumulated oil yield of the oil field corresponding to the accumulated oil yield and water content mathematical model as the recoverable reserves of the crude oil of the water-flooding reservoir when the water content in the accumulated oil yield and water content mathematical model is the limit water content.
6. The apparatus of claim 5, wherein the production data comprises annual oil production, cumulative liquid production, and water cut data.
7. The apparatus of claim 5, wherein the production data comprises cumulative oil production and water content.
8. The apparatus of claim 5, further comprising a plate creation module, specifically configured to:
and establishing a curve plate of the accumulated oil yield and the water content under different crude oil recoverable reserves according to the mathematical model of the accumulated oil yield and the water content.
9. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor, when executing the computer program, implements the method of predicting crude oil recoverable reserves of a water reservoir as claimed in any one of claims 1 to 4.
10. A computer-readable storage medium, wherein the computer-readable storage medium stores a computer program for executing the method of predicting the recoverable oil reserve of any one of claims 1 to 4.
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| CN106639995A (en) * | 2016-11-18 | 2017-05-10 | 中国石油天然气股份有限公司 | Method for predicting crude oil production ratio of water-drive oil reservoir |
| CN108920781A (en) * | 2018-06-14 | 2018-11-30 | 中国石油天然气股份有限公司 | A kind of determination method and apparatus of oil reservoir moisture percentage and water_bearing escalating rate |
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| CN106639995A (en) * | 2016-11-18 | 2017-05-10 | 中国石油天然气股份有限公司 | Method for predicting crude oil production ratio of water-drive oil reservoir |
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