CN112396265B - Method and device for determining water circulation level of water flooding sandstone reservoir - Google Patents
Method and device for determining water circulation level of water flooding sandstone reservoir Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 309
- 238000000034 method Methods 0.000 title claims abstract description 43
- 238000002347 injection Methods 0.000 claims abstract description 83
- 239000007924 injection Substances 0.000 claims abstract description 83
- 238000006073 displacement reaction Methods 0.000 claims abstract description 52
- 230000008859 change Effects 0.000 claims abstract description 38
- 230000003247 decreasing effect Effects 0.000 claims description 25
- 238000004458 analytical method Methods 0.000 claims description 19
- 238000004590 computer program Methods 0.000 claims description 18
- 238000004519 manufacturing process Methods 0.000 claims description 14
- 238000005406 washing Methods 0.000 claims description 14
- 230000008569 process Effects 0.000 claims description 12
- 238000013480 data collection Methods 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000004364 calculation method Methods 0.000 claims 1
- 230000008901 benefit Effects 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 8
- 239000003921 oil Substances 0.000 description 55
- 238000010586 diagram Methods 0.000 description 12
- 238000011161 development Methods 0.000 description 8
- 230000006870 function Effects 0.000 description 5
- 230000001965 increasing effect Effects 0.000 description 5
- 238000012545 processing Methods 0.000 description 4
- 238000011160 research Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 239000010779 crude oil Substances 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 241000084490 Esenbeckia delta Species 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
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- 239000007788 liquid Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q10/00—Administration; Management
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- G06Q10/063—Operations research, analysis or management
- G06Q10/0639—Performance analysis of employees; Performance analysis of enterprise or organisation operations
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/20—Displacing by water
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q50/00—Systems or methods specially adapted for specific business sectors, e.g. utilities or tourism
- G06Q50/02—Agriculture; Fishing; Mining
Abstract
The invention provides a method and a device for determining the water circulation level of a water flooding sandstone oil reservoir, wherein the method comprises the following steps: establishing a water displacement efficiency curve of sandstone; and determining the water circulation level according to the slope change of the water flooding efficiency curve. The invention provides a unified standard for defining the water circulation level of the water flooding sandstone reservoir, can simply and effectively define the water circulation level, further facilitates the accurate adjustment of water injection measures according to the accurate water circulation grading, improves the water injection effect, digs the potential of residual oil, improves the water flooding efficiency, reduces the exploitation cost and realizes win-win of yield and benefit.
Description
Technical Field
The invention relates to the field of water-flooding sandstone oil reservoir development, in particular to a method and a device for determining a water circulation level of a water-flooding sandstone oil reservoir.
Background
The water flooding sandstone oil reservoir occupies a main position in oil field production, after the water flooding development for many years enters a middle-high water content development stage, a water flow dominant channel is easily formed under the influence of various factors such as heterogeneity of the reservoir, long-term water flooding flushing and the like, so that the sweep volume of injected water from an injection end to a production end is reduced, and inefficient or invalid displacement, namely inefficient and invalid water circulation, is generated in the reservoir space. In the long term, the difference of oil reservoir water washing is increased, the water displacement efficiency is deteriorated, the development cost of the oil field is greatly increased, and the economic benefit of the oil field is influenced.
Therefore, research and treatment of targeted inefficient and ineffective water circulation are urgent demands for heavy crude oil production tasks and benefit development at low oil prices. However, the previous definition of effective, low-efficiency and invalid water circulation is only remained in the fuzzy qualitative definition stage, the low-efficiency and invalid water circulation is a relative concept, and the definition method of the existing water circulation level has no accuracy and uniformity.
Disclosure of Invention
The invention provides a water circulation level determining method and device for a water flooding sandstone oil reservoir, which are used for solving the defect that the existing water circulation level defining method is not accurate and uniform.
In order to solve the technical problem, a first aspect of the present invention provides a method for determining a water circulation level of a water flooding sandstone reservoir, including:
establishing a water displacement efficiency curve of sandstone;
and determining the water circulation level according to the slope change of the water flooding efficiency curve.
In a further embodiment, the process of establishing a water flooding efficiency curve for sandstone includes:
measuring oil displacement efficiency of the sandstone core sample under different injection multiples;
and establishing a water flooding efficiency curve according to the flooding efficiency under different injection multiples.
In a further embodiment, the determining the displacement efficiency of the sandstone core sample at different injection multiples comprises calculating the displacement efficiency by the following formula:
ED i ＝1-Sor i /So i ，
wherein ED is i For oil displacement efficiency at injection multiple i, sor i For residual oil saturation after displacement at injection multiple i, so i Is the saturation of oil before displacement at injection multiple i.
In a further embodiment, the process of determining the water circulation level according to the slope change of the water flooding efficiency curve comprises the following steps:
calculating the tangential slope of the water flooding efficiency curve according to the water flooding efficiency curve;
determining a water flooding efficiency change rate curve according to the tangential slope and injection multiple of the water flooding efficiency curve;
determining a demarcation point of the decreasing speed according to the water displacement efficiency change rate curve;
and determining the demarcation point of the water circulation level according to the demarcation point of the decreasing speed.
In a further embodiment, the process of determining the water circulation level according to the slope change of the water flooding efficiency curve further comprises:
for the water injection well, determining the range of the water circulation level according to the demarcation point of the water circulation level and the water displacement efficiency curve.
In a further embodiment, the process of determining the water circulation level according to the slope change of the water flooding efficiency curve comprises the following steps:
converting the water flooding efficiency curve into a water washing efficiency curve;
for a production well, determining the range of the water circulation level according to the demarcation point of the water circulation level and the water washing efficiency curve.
The second aspect of the invention provides a device for determining the water circulation level of a water flooding sandstone reservoir, which comprises the following components:
the water-flooding efficiency analysis module is used for establishing a water-flooding efficiency curve of sandstone;
and the water circulation level analysis module is used for determining the water circulation level according to the slope change of the water flooding efficiency curve.
In a further embodiment, the water flooding efficiency analysis module comprises:
the data collection unit is used for measuring oil displacement efficiency of the sandstone core sample under different injection multiples;
and the curve building unit is used for building a water flooding efficiency curve according to the flooding efficiency under different injection multiples.
In a further embodiment, the data collection unit calculates the displacement efficiency of the sandstone core sample at each injection multiple by the following formula:
ED i ＝1-Sor i /So i ，
wherein ED is i For oil displacement efficiency at injection multiple i, sor i For residual oil saturation after displacement at injection multiple i, so i Is the saturation of oil before displacement at injection multiple i.
In a further embodiment, the water circulation level analysis module includes:
the slope calculating unit is used for calculating the tangential slope of the water flooding efficiency curve according to the water flooding efficiency curve;
the curve determining unit is used for determining a water flooding efficiency change rate curve according to the tangential slope of the water flooding efficiency curve and the injection multiple;
the curve change analysis unit is used for determining a demarcation point of the decreasing speed according to the water flooding efficiency change rate curve;
the water circulation level dividing unit is used for determining the dividing point of the water circulation level according to the dividing point of the decreasing speed.
In a further embodiment, the water circulation level dividing unit is further configured to determine, for the water injection well, a range of water circulation levels according to a demarcation point of the water circulation levels and a water flooding efficiency curve.
In a further embodiment, the water circulation level analysis module further comprises:
the conversion unit is used for converting the water flooding efficiency curve into a water washing curve;
the water circulation level dividing unit is also used for determining the range of the water circulation level according to the demarcation point of the water circulation level and the water washing efficiency curve.
A third aspect of the present invention provides a computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the steps of the water-flooding sandstone reservoir water circulation level determination method of any of the preceding embodiments when the computer program is executed.
A fourth aspect of the present invention provides a computer readable storage medium storing a computer program for executing the steps of the water-flooding sandstone reservoir water circulation level determination method according to any of the preceding embodiments, when the computer program is executed by a processor.
The method and the device for determining the water circulation level of the water-flooding sandstone oil reservoir provide unified standards for defining the water circulation level of the water-flooding sandstone oil reservoir, can simply and effectively define the water circulation level, further facilitate accurate adjustment of water injection measures according to accurate water circulation grading, improve water injection effect, mine residual oil potential, improve water flooding efficiency, reduce exploitation cost and realize win-win of yield and benefit.
The foregoing and other objects, features and advantages of the invention will be apparent from the following more particular description of preferred embodiments, as illustrated in the accompanying drawings.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 shows a flow chart of a water circulation level determination method for a water flooding sandstone reservoir, which is provided by an embodiment of the invention;
FIG. 2 is a schematic diagram of a water flooding efficiency curve provided by an embodiment of the present invention;
FIG. 3 shows a flow chart of a water flooding efficiency curve establishment process provided by an embodiment of the present invention;
FIG. 4 is a flow chart illustrating a process for determining a water circulation level from a slope change of a water flooding efficiency curve provided by an embodiment of the present invention;
FIG. 5 is a schematic diagram showing a water flooding efficiency change rate curve provided by an embodiment of the present invention;
FIG. 6 is a schematic diagram of a water wash efficiency curve provided by an embodiment of the present invention;
FIG. 7 shows a block diagram of a water circulation level determining device for a water flooding sandstone reservoir according to an embodiment of the present invention;
FIG. 8 shows a schematic diagram of a (partial) subdivision reorganization of an S-well histogram provided by an embodiment of the present invention;
fig. 9 shows a schematic diagram of an injection and production curve of an S-well group according to an embodiment of the present invention.
Detailed Description
In order to make the technical features and effects of the present invention more obvious, the technical solution of the present invention will be further described with reference to the accompanying drawings, and the present invention may be described or implemented by other different specific examples, and any equivalent transformation made by those skilled in the art within the scope of the claims falls within the protection scope of the present invention.
The following detailed description is presented in the form of flowcharts, logic modules, and other symbolic representations of operations that can be performed on a computer system. A procedure, computer executed step, logic block, process, etc., is here conceived to be a self-consistent sequence of one or more steps or instructions leading to a desired result. The steps are those requiring physical manipulations of physical quantities. These include electrical, magnetic, or radio signals, which are stored, transferred, combined, compared, and otherwise manipulated in a computer system. These signals may be bits, values, elements, symbols, characters, conditions, numbers, or the like. Each step may be performed by hardware, software, firmware, or a combination thereof.
In the prior art, research and treatment of targeted low-efficiency invalid water circulation are carried out, and urgent demands for heavy crude oil production tasks and benefit development under low oil price are met. However, the previous definition of effective, low-efficiency and invalid water circulation is only remained in the fuzzy qualitative definition stage, the low-efficiency and invalid water circulation is a relative concept, and the definition method of the existing water circulation level has no accuracy and uniformity.
Based on the above, the invention provides a water circulation level determining method for a water-flooding sandstone oil reservoir, as shown in fig. 1, fig. 1 shows a flow chart of the water circulation level determining method for the water-flooding sandstone oil reservoir, and the embodiment provides unified standards for water circulation level definition of the water-flooding sandstone oil reservoir, can simply and effectively define the water circulation level, and further facilitates accurate adjustment of water injection measures according to accurate water circulation grading, improves water injection effect, digs residual oil potential, improves water flooding efficiency, reduces exploitation cost, and realizes win-win of yield and benefit.
Specifically, the method for determining the water circulation level of the water flooding sandstone reservoir comprises the following steps:
step 100, establishing a water flooding efficiency curve of sandstone;
step 200, determining the water circulation level according to the slope change of the water flooding efficiency curve.
As shown in fig. 2, it can be seen from the water flooding efficiency curve that the flooding efficiency is rapidly improved when the water flooding efficiency is injected at a small injection multiple in the initial stage, that is, the injected water is effectively displaced, and then the curve has an inflection point, so that the flooding efficiency is slowly increased, which means that the displacement effect of the injected water is gradually deteriorated at this time, that is, the water flooding stage enters a low-efficiency water circulation stage; and finally, with the great increase of the injection multiple, the oil displacement efficiency is obviously reduced, namely the injected water enters an invalid water circulation stage. Therefore, the water circulation states of different levels can be accurately reflected according to the slope change of the water flooding efficiency curve.
In some embodiments of the present invention, as shown in fig. 3, the process of establishing the water flooding efficiency curve of sandstone in the step 100 includes:
step 110, measuring oil displacement efficiency of a sandstone core sample under different injection multiples;
step 120, a water flooding efficiency curve is established according to the flooding efficiency under different injection multiples, as shown in fig. 2, the abscissa of the water flooding efficiency curve is the injection multiple, and the ordinate is the flooding efficiency.
In detail, in the implementation of the step 110, a core sample representative of the research area is selected, and then the oil displacement efficiency of the core sample of sandstone at different injection multiples is measured indoors, and specifically, the oil displacement efficiency of the core sample of sandstone at different injection multiples can be calculated by the following formula:
ED i ＝1-Sor i /So i ，
wherein ED is i For oil displacement efficiency at injection multiple i, sor i For residual oil saturation after displacement at injection multiple i, so i Is the saturation of oil before displacement at injection multiple i.
In some embodiments of the present invention, as shown in fig. 4, the process of determining the water circulation level according to the slope change of the water flooding efficiency curve in the step 200 includes:
step 210, calculating the tangential slope of the water flooding efficiency curve according to the water flooding efficiency curve;
step 220, determining a water flooding efficiency change rate curve according to the tangential slope and the injection multiple of the water flooding efficiency curve;
step 230, determining a demarcation point of the decreasing speed according to the water displacement efficiency change rate curve;
step 240, determining the demarcation point of the water circulation level according to the demarcation point of the decreasing speed.
In detail, the step 210 can obtain the tangential slope of the water flooding efficiency curve by deriving the flooding efficiency from the injection multiple, i.e. delta flooding efficiency/delta injection multiple.
The water flooding efficiency change rate curve in the step 220 is shown in fig. 5, in which the abscissa represents the injection multiple and the ordinate represents the tangential slope of the water flooding efficiency curve.
Through the above step 23The decreasing speed demarcation point in 0 can divide the water flooding efficiency change rate curve into three interval sections: the dividing point of the decreasing speed can be used as the dividing point of the water circulation level, namely the dividing point of the delta oil displacement efficiency/delta injection multiple is rapidly decreased (as shown in fig. 5, the decreasing rate 5.623) to the inflection point (as shown in the point c of fig. 5) appearing at the first slow decreasing section to be used as the dividing point of the effective water circulation and the inefficient water circulation, and the inflection point (as shown in the point e of fig. 5) of the delta oil displacement efficiency/delta injection multiple is slowly decreased (as shown in fig. 5, the decreasing rate 1.69) to be used as the dividing point of the inefficient water circulation and the ineffective water circulation. The fast descent segment, the slow descent segment and the extremely slow descent segment are determined by the following modes: on the curve of the change rate of the water displacement efficiency, an exponential function trend line y=ae is made for the curve sections adjacent to two points -i The trend line shows i in the negative power of i of the formula e, namely the decreasing rate, the rapid decreasing segment with the largest decreasing rate, the extremely slow decreasing segment with the smallest decreasing rate, and the slow decreasing segment between the two segments.
The water circulation level can be determined according to the demarcation point of the water circulation level, as shown in fig. 5, the ac section of the rapid gradual decrease section of delta oil displacement efficiency/delta injection multiple is divided into effective water circulation, the ce section of the slow decrease section of delta oil displacement efficiency/delta injection multiple is divided into low-efficiency water circulation, and the ef section of the extremely slow decrease section of delta oil displacement efficiency/delta injection multiple is divided into ineffective water circulation stages.
In a further embodiment, in order to clearly indicate the water circulation level when the present invention is applied to the injection well, the determining the water circulation level according to the slope change of the water flooding efficiency curve in the above step 200 further includes:
step 250, for the water injection well, determining the range of the water circulation level according to the demarcation point of the water circulation level and the water displacement efficiency curve.
As shown in fig. 5, the range of effective water circulation is: the injection multiple is smaller than the abscissa of the point c; the range of the low-efficiency water circulation is as follows: the abscissa of the injection multiple smaller than the point e is larger than the ordinate of the point c; the range of invalid water circulation is: the injection multiple is greater than the abscissa of point e.
In a further embodiment, in order to clearly indicate the water circulation level when the present invention is applied to the oil recovery well, the determining the water circulation level according to the slope change of the water flooding efficiency curve in the above step 200 includes: step 260, converting the water flooding efficiency curve into a water washing efficiency curve, as shown in fig. 6;
step 270, for the oil production well, determining the range of the water circulation level according to the demarcation point of the water circulation level and the water washing efficiency curve, as shown in fig. 6, wherein the area a is effective water circulation, the area B is inefficient water circulation, and the area C is ineffective water circulation.
Based on the same inventive concept, the embodiment of the invention also provides a water circulation level determining device for the water flooding sandstone reservoir, as described in the following embodiment. Because the principle of the device for solving the problems is similar to that of the water-flooding sandstone reservoir water circulation level determining method, the implementation of the device can be referred to the implementation of the water-flooding sandstone reservoir water circulation level determining method, and the repetition is omitted.
As shown in fig. 7, the device for determining the water circulation level of the water flooding sandstone reservoir comprises:
the water-flooding efficiency analysis module 710 is configured to establish a water-flooding efficiency curve of sandstone;
the water circulation level analysis module 720 is configured to determine a water circulation level according to a slope change of the water flooding efficiency curve.
The embodiment provides unified standards for defining the water circulation level of the water flooding sandstone oil reservoir, can simply and effectively define the water circulation level, further facilitates the adjustment of water injection measures according to the accurate water circulation classification and accuracy, improves the water injection effect, digs the potential of residual oil, improves the water flooding efficiency, reduces the exploitation cost, and realizes win-win of yield and benefit.
In some embodiments of the invention, the water flooding efficiency analysis module 710 includes:
the data collection unit 711 is used for measuring oil displacement efficiency of the sandstone core sample under different injection multiples;
and the curve building unit 712 is configured to build a water flooding efficiency curve according to flooding efficiencies at different injection multiples.
In specific implementation, the data collection unit 711 calculates the oil displacement efficiency of the sandstone core sample at each injection multiple according to the following formula:
ED i ＝1-Sor i /So i ，
wherein ED is i For oil displacement efficiency at injection multiple i, sor i For residual oil saturation after displacement at injection multiple i, so i Is the saturation of oil before displacement at injection multiple i.
In some embodiments of the present invention, the water circulation level analysis module 720 includes:
the slope calculating unit 721 is configured to calculate a tangential slope of the water-flooding efficiency curve according to the water-flooding efficiency curve;
the curve determining unit 722 is configured to determine a water flooding efficiency change rate curve according to a tangential slope and an injection multiple of the water flooding efficiency curve;
the curve change analysis unit 723 is used for determining a demarcation point of the decreasing speed according to the water flooding efficiency change rate curve;
the water circulation level dividing unit 724 is used for determining the demarcation point of the water circulation level according to the demarcation point of the decreasing speed.
In some embodiments of the present invention, the water circulation level dividing unit 724 is further configured to determine, for the water injection well, a range of water circulation levels according to the demarcation point of the water circulation level and the water flooding efficiency curve.
In some embodiments of the present invention, the water circulation level analysis module 720 further includes: the conversion unit 725 is used for converting the water flooding efficiency curve into a water washing curve. The water circulation level dividing unit 724 is further configured to determine a range of water circulation levels according to the demarcation point of the water circulation level and the water washing efficiency curve.
The method and the device for determining the water circulation level of the water-flooding sandstone oil reservoir provide unified standards for defining the water circulation level of the water-flooding sandstone oil reservoir, can simply and effectively define the water circulation level, further facilitate accurate adjustment of water injection measures according to accurate water circulation grading, improve water injection effect, mine residual oil potential, improve water flooding efficiency, reduce exploitation cost and realize win-win of yield and benefit.
In order to more clearly illustrate the technical scheme of the invention, a specific embodiment is described below.
The Liaohe oil field S block belongs to a high Kong Gaoshen sandstone oil reservoir and enters a high-water-content low-speed development stage. Before the invention is applied, firstly, water injection wells and oil extraction wells which have low-efficiency ineffective water circulation phenomena are screened out by using methods such as water flooding characteristic curves, production dynamic analysis, tracers and the like; thirdly, adopting a water absorption profile, a liquid production profile, monitoring data and the like to lock a layer with low-efficiency invalid water circulation in a single well for the screened part of wells; and drawing a multi-parameter intersection chart to find out the sensitive parameters of the low-efficiency ineffective water circulation, primarily distinguishing the normal production layer from the low-efficiency ineffective water circulation layer, and providing more basis for the subsequent ineffective water circulation classification. Then, the invention is adopted to determine the water circulation level for the oil extraction well and the water injection well (for the water injection well, the water circulation level range is expressed by injection times, and for the water injection well, the water circulation level range is expressed by water washing efficiency), and establish the identification standard, and the Liaohe oil field S block layer selection water circulation level classification interval table is as follows:
based on the identification result, the water flooding development and adjustment work is carried out around the thought of 'suppressing invalid water, suppressing low-efficiency water and adjusting effective water', so that the cost and the efficiency are reduced. Taking an S well group as an example, the water injection effect can not be effectively improved through geological layering subdivision water injection in the past, by dividing an inefficient ineffective water circulation layer, adopting the novel concept of subdivision quality of the invention, recombining the inefficient, ineffective and effective layers (shown in fig. 8), increasing the daily oil production of the well group from 7.9 tons to 12.1 tons (shown in fig. 9), increasing 390.5 tons in stages, and adopting numerical simulation prediction, the block prediction recovery rate can be improved by 2% through subdivision quality recombination.
The practice shows that the invention can simply and effectively evaluate the water circulation level of the injected water in a grading way, thereby adopting corresponding adjustment and treatment measures in production and really achieving the aims of reducing the cost and enhancing the efficiency.
In some embodiments of the present invention, there is further provided a computer device including a memory, a processor, and a computer program stored on the memory and executable on the processor, where the steps of the water-flooding sandstone reservoir water circulation level determination method according to any of the preceding embodiments are implemented when the computer program is executed by the processor.
In some embodiments of the present invention, there is further provided a computer readable storage medium storing a computer program for executing the steps of the water circulation level determination method for a water flooding sandstone reservoir according to any of the previous embodiments, when the computer program is executed by a processor.
It will be appreciated by those skilled in the art that 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 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 above description is only for the purpose of illustrating the technical solution of the present invention, and any person skilled in the art may modify and change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Therefore, the protection scope of the invention should be considered as the scope of the claims.
Claims (8)
1. The method for determining the water circulation level of the water flooding sandstone oil reservoir is characterized by comprising the following steps of:
establishing a water displacement efficiency curve of sandstone;
determining a water circulation level according to the slope change of the water flooding efficiency curve;
the process for establishing the water flooding efficiency curve of the sandstone comprises the following steps:
measuring oil displacement efficiency of the sandstone core sample under different injection multiples;
establishing a water flooding efficiency curve according to flooding efficiency under different injection multiples;
the measuring of the oil displacement efficiency of the sandstone core sample under different injection multiples comprises the following calculation of the oil displacement efficiency through the following formula:
ED i ＝1-Sor i /So i ，
wherein ED is i For oil displacement efficiency at injection multiple i, sor i For residual oil saturation after displacement at injection multiple i, so i Oil saturation before displacement at injection multiple i;
the process for determining the water circulation level according to the slope change of the water flooding efficiency curve comprises the following steps:
calculating the tangential slope of the water flooding efficiency curve according to the water flooding efficiency curve;
determining a water flooding efficiency change rate curve according to the tangential slope and injection multiple of the water flooding efficiency curve;
determining a demarcation point of the decreasing speed according to the water displacement efficiency change rate curve;
and determining the demarcation point of the water circulation level according to the demarcation point of the decreasing speed.
2. The method of claim 1, wherein determining the water circulation level from the slope change of the water flooding efficiency curve further comprises:
for the water injection well, determining the range of the water circulation level according to the demarcation point of the water circulation level and the water displacement efficiency curve.
3. The method of claim 1, wherein determining the water circulation level from the slope change of the water flooding efficiency curve comprises:
converting the water flooding efficiency curve into a water washing efficiency curve;
for a production well, determining the range of the water circulation level according to the demarcation point of the water circulation level and the water washing efficiency curve.
4. The utility model provides a water circulation level determining means of water drive sandstone reservoir which characterized in that includes:
the water-flooding efficiency analysis module is used for establishing a water-flooding efficiency curve of sandstone;
the water circulation level analysis module is used for determining the water circulation level according to the slope change of the water flooding efficiency curve;
the water flooding efficiency analysis module comprises:
the data collection unit is used for measuring oil displacement efficiency of the sandstone core sample under different injection multiples;
the curve building unit is used for building a water flooding efficiency curve according to the flooding efficiency under different injection multiples;
the data collection unit calculates the oil displacement efficiency of the sandstone core sample under each injection multiple according to the following formula:
ED i ＝1-Sor i /So i ，
wherein ED is i For oil displacement efficiency at injection multiple i, sor i For residual oil saturation after displacement at injection multiple i, so i Oil saturation before displacement at injection multiple i;
the water circulation level analysis module includes:
the slope calculating unit is used for calculating the tangential slope of the water flooding efficiency curve according to the water flooding efficiency curve;
the curve determining unit is used for determining a water flooding efficiency change rate curve according to the tangential slope of the water flooding efficiency curve and the injection multiple;
the curve change analysis unit is used for determining a demarcation point of the decreasing speed according to the water flooding efficiency change rate curve;
the water circulation level dividing unit is used for determining the dividing point of the water circulation level according to the dividing point of the decreasing speed.
5. The apparatus of claim 4, wherein the water circulation level dividing unit is further configured to determine a range of water circulation levels for the water injection well based on the demarcation point of the water circulation levels and the water flooding efficiency curve.
6. The apparatus of claim 4, wherein the water circulation level analysis module further comprises:
the conversion unit is used for converting the water flooding efficiency curve into water washing efficiency;
the water circulation level dividing unit is also used for determining the range of the water circulation level according to the demarcation point of the water circulation level and the water washing efficiency curve.
7. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the water-flooding sandstone reservoir water circulation level determination method of any of claims 1 to 3 when the computer program is executed by the processor.
8. A computer readable storage medium, characterized in that the computer readable storage medium stores an executing computer program which when executed by a processor implements the steps of the water-flooding sandstone reservoir water circulation level determination method of any of claims 1 to 3.
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