CN113011772B - Calculation method for recovery ratio of gas-drive reservoir, data processing device, computer equipment and readable storage medium - Google Patents
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Abstract
The invention belongs to the technical field of recovery ratio calculation, and discloses a calculation method, a device, computer equipment and a storage medium of oil reservoir gas drive recovery ratio, wherein the calculation method comprises the following steps: determining the cumulative oil production measured in subsurface volume from the cumulative oil production measured in ground mass; determining a cumulative water yield measured in subsurface volume from the cumulative water yield measured in ground mass; determining the cumulative gas production measured in the subsurface volume from the cumulative gas production measured in the surface volume; obtaining a gas drive characteristic curve function according to the accumulated oil yield measured by the underground volume, the accumulated water yield measured by the underground volume and the accumulated gas yield measured by the underground volume, obtaining a fitting coefficient and a fitting constant, and calculating the gas drive limit accumulated oil according to the fitting coefficient, the fitting constant and the water-gas-oil ratio; and calculating the gas flooding recovery ratio according to the gas flooding limit accumulated oil production. And (3) obtaining the gas-drive recoverable reserves by calibrating the gas-drive recovery ratio of the oil deposit, and guiding the programming of a gas-drive development scheme of the oil deposit, the calibration of the recoverable reserves of the gas-drive oil deposit and the evaluation of the SEC reserves.
Description
Technical Field
The invention relates to the technical field of recovery ratio calculation, in particular to a gas-drive reservoir recovery ratio calculation method, a data processing device, computer equipment and a readable storage medium.
Background
After the oil reservoir is developed by water injection, the oil reservoir integrally enters the middle and later stages of development of high comprehensive water content, high extraction degree and low oil extraction speed; the continuous water flooding potential is small, the stable production situation is passive, and part of oil reservoirs adopt a gas injection mode to improve the oil reservoir recovery ratio, however, the conventional water flooding characteristic curve function is only suitable for the water flooding stage and is not suitable for gas flooding recovery ratio calculation any more. Therefore, it is necessary to provide a calculation method for gas recovery ratio, so as to obtain the recoverable gas oil reservoir.
Disclosure of Invention
The invention aims to provide a calculation method of the recovery ratio of the gas-drive reservoir, which has high calculation precision and can realize accurate calibration of the recovery ratio of the gas-drive reservoir.
The second purpose of the invention is to provide a data processing device for the recovery ratio of the gas-drive reservoir.
It is a further object of the present invention to provide a computer device.
A fourth object of the present invention is to provide a readable storage medium.
The invention is realized by the following technical scheme:
a calculation method of recovery ratio of a gas-displacement reservoir comprises the following steps:
s1, determining accumulated oil yield measured by underground volume according to the accumulated oil yield measured by ground mass;
determining a cumulative water yield measured in subsurface volume from the cumulative water yield measured in ground mass;
determining the cumulative gas production measured in the subsurface volume from the cumulative gas production measured in the surface volume;
s2, obtaining a gas-drive characteristic curve function according to accumulated oil yield measured by the underground volume, accumulated water yield measured by the underground volume and accumulated gas yield measured by the underground volume, wherein the gas-drive characteristic curve function is as follows:
ln(W p B w +G p B g )＝bN p B o +a；
wherein: w (W) p The accumulated water yield measured by the ground quality is ten thousand tons;
B w is a stratum water volume coefficient, and is dimensionless;
G p the method is a hundred million parties for accumulating gas yield measured by the ground volume;
B g is a natural gas volume coefficient, and is dimensionless;
N p the accumulated oil yield measured by the ground quality is ten thousand tons;
B o is the volume coefficient of crude oil, and is dimensionless;
b is a fitting coefficient;
a is a fitting constant;
determining a fitting coefficient b and a fitting constant a according to a class of gas-driven characteristic curve functions;
s3, according to the fitting coefficient b, the fitting constant a and the water-gas-oil ratio R wgo Calculating gas drive cumulative production measured by underground volumeOil quantity N p2 The formula is:
s4, calculating the gas flooding recovery ratio according to the gas flooding limit accumulated oil production and combining the reservoir geological reserves.
Further, in S1, the cumulative oil yield measured in the subsurface volume is determined from the cumulative oil yield measured in the ground mass, specifically:
the accumulated oil yield measured by the ground mass is divided by the density of the crude oil and multiplied by the volume coefficient of the crude oil, so that the accumulated oil yield measured by the underground volume is obtained.
Further, in S1, the cumulative water amount measured in the subsurface volume is determined from the cumulative water amount measured in the ground mass, specifically:
dividing the accumulated water yield measured by the ground mass by the formation water density, and multiplying by the formation water volume coefficient to obtain the accumulated water yield measured by the underground volume.
Further, in S1, the cumulative gas yield measured in the subsurface volume is determined from the cumulative gas yield measured in the ground volume, specifically:
the cumulative gas yield measured by the ground volume is multiplied by the natural gas accumulation coefficient to obtain the cumulative gas yield measured by the underground volume.
Further, in S2, the process of obtaining a gas drive characteristic curve function is as follows:
and summing the accumulated water yield measured by the underground volume and the accumulated gas yield measured by the underground volume, and drawing the sum and the accumulated gas yield measured by the underground volume under a semi-logarithmic coordinate system to obtain a gas drive characteristic curve function.
Further, in S3, the water-gas-oil ratio R wgo The calculation formula of (2) is as follows:
wherein: f (f) wg Is the water vapor content.
Further, S4 is specifically: dividing the gas flooding limit accumulated oil by the reservoir geological reserves to obtain the gas flooding recovery ratio.
The invention also discloses a data processing device of the recovery ratio of the gas-drive reservoir, which comprises:
the storage module is used for storing accumulated oil yield measured by ground mass, accumulated water yield measured by ground mass and accumulated gas yield measured by ground volume;
the first processing module is used for calculating the accumulated oil yield measured by the underground volume according to the accumulated oil yield measured by the ground mass;
the second processing module is used for calculating the accumulated water yield measured by the underground volume according to the accumulated water yield measured by the ground mass;
the third processing module is used for calculating the cumulative gas yield measured by the underground volume according to the cumulative gas yield measured by the ground volume;
the fourth processing module is used for solving a fitting coefficient and a fitting constant according to the accumulated oil yield measured by the underground volume, the accumulated water yield measured by the underground volume and the accumulated gas yield measured by the underground volume;
the fifth processing module is used for calculating the gas-drive cumulative oil yield measured by the underground volume according to the fitting coefficient, the fitting constant and the water-gas-oil ratio;
and the sixth processing module is used for calculating the gas flooding recovery ratio according to the gas flooding limit accumulated oil production and combining the reservoir geological reserves.
The invention also discloses a computer device, which comprises a memory, a processor and a computer program stored in the memory and capable of running on the processor, wherein the processor executes the computer program to realize the steps of the gas reservoir recovery ratio calculation method.
The invention also discloses a computer readable storage medium storing a computer program which when executed by a processor implements the steps of the method for calculating gas reservoir recovery.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention discloses a calculation method, a data processing device, computer equipment and a readable storage medium for gas-drive reservoir recovery ratio, which are used for obtaining a gas-drive characteristic curve function according to accumulated oil yield measured by underground volume, accumulated water yield measured by underground volume and accumulated gas yield measured by underground volume, wherein the gas-drive characteristic curve function is not random combination of three accumulated yields, but is obtained through multiple attempts, strict deduction verification and the like, and has important physical significance; according to the invention, the final gas-drive oil reservoir recovery ratio can be obtained through calculation according to the accumulated oil yield measured by the ground quality, the accumulated water yield measured by the ground quality and the accumulated gas yield measured by the ground volume, a specific calculation formula is provided, the gas-drive oil reservoir recovery ratio can be rapidly calculated through the existing data, great convenience is provided for staff, the method principle is reliable, the calculation precision is high, and the accurate calibration of the gas-drive recovery ratio can be realized. And (3) calibrating the gas-drive recovery ratio of the oil reservoir, and further solving the gas-drive recoverable reserve so as to guide the establishment of a gas-drive development scheme of the oil reservoir, the calibration of the recoverable reserve of the gas-drive oil reservoir and the evaluation of the SEC reserve.
Drawings
FIG. 1 is a graph of a gas-drive characteristic curve of a Y-type oil reservoir of the invention.
Detailed Description
The invention discloses a calculation method of recovery ratio of a gas-displacement reservoir, which comprises the following steps:
(1) Treatment of cumulative oil production
Accumulated oil yield N in comprehensive data sheet for oil field development p Measured in units of ground mass (ten thousand tons), which need to be converted into units of subsurface volume (ten thousand tons) for ease of calculation; the method comprises dividing accumulated oil yield measured in mass unit by crude oil density, multiplying by crude oil volume coefficient to obtain accumulated oil yield N measured in underground volume (everywhere) p B o 。
(2) Treating cumulative water production
Similarly, the cumulative water yield W measured in the unit of ground mass p Dividing by the formation water density, multiplying by the formation water volume coefficient to obtainCumulative water production W measured in underground volume (square) p B w 。
(3) Treatment of cumulative gas production
Due to cumulative gas production G p The oil is measured in the unit of ground volume (hundred million square), and is required to be converted into underground volume in order to be unified with the unit of accumulated oil and water; the concrete practice is to multiply the natural gas volume coefficient to obtain the cumulative gas yield G measured by underground volume (everything) p B g 。
(4) Data processing
Will accumulate water yield W p B w And cumulative gas production G p B g Summing, and adding the sum and accumulated oil yield N p B o Drawing in a semi-logarithmic coordinate system to obtain a gas-driven characteristic curve function:
ln(W p B w +G p B g )＝bN p B o +a (1)
wherein: w (W) p The cumulative water yield measured by the ground quality is ten thousand tons;
B w -formation water volume coefficient, dimensionless;
G p cumulative gas production measured in terms of ground volume, yi Fang;
B g -natural gas volumetric coefficient, dimensionless;
N p -cumulative oil production measured in terms of ground mass, ten thousand tons;
B o -crude oil volume coefficient, dimensionless;
b-fitting coefficients;
a-fitting constant.
(5) Taking the logarithm and simplifying
Taking logarithms from two sides of a linear fitting function of the sum value of the cumulative water and the cumulative gas and the cumulative oil to obtain the following expression:
taking into account the cumulative yield versus time derivative as the average daily or monthly yield, namely:
substituting formulas (3) - (5) into formula (2), formula (2) can be simplified and consolidated into:
(6) Simplifying and taking logarithms
Definition of the Water-gas-oil ratio R wgo The water-gas-oil ratio function is obtained for the ratio of daily or monthly water production, gas production and daily or monthly oil production, and is as follows:
the combination of formulas (6) and (7) and formula (1) gives the logarithmic result:
ln R wgo ＝ln b+a+bN p B o (8)
(7) Finding the accumulated oil yield of gas flooding
Reversely solving the gas flooding accumulated oil yield measured by underground volume under a certain water-gas-oil ratio condition according to a water-gas-oil ratio function:
(8) Definition of moisture content
According to the definition of the water content, the water content is defined as the ratio of daily or monthly water production, gas production and total yield:
combining equation (10) with equation (7) yields
Under the limit condition of gas drive, the water-gas-oil ratio R can be obtained according to the limit water-gas content rate of the gas drive wgo A numerical value; and (3) combining the values a and b in the formula (1) so as to obtain the gas flooding limit accumulated oil.
(9) Calculating gas drive recovery ratio
And (3) accumulating the oil according to the gas flooding limit calculated in the step (7), and combining the specific oil reservoir geological reserves, and dividing the gas flooding limit accumulated oil by the oil reservoir geological reserves to obtain the gas flooding recovery ratio.
The invention will now be described in further detail with reference to specific examples, which are intended to illustrate, but not to limit, the invention.
The invention is further described by taking Y reservoir gas injection major development test as an example:
(1) Treatment of cumulative oil production
Cumulative oil production N to be measured in terms of ground mass p Dividing by the density of the crude oil, multiplying by the volume coefficient of the crude oil to obtain the accumulated oil yield N measured by the underground volume p B o 。
(2) Treating cumulative water production
Cumulative water production W to be measured in ground mass p Dividing by the formation water density, multiplying by the formation water volume coefficient, and obtaining the accumulated water yield W measured by the underground volume p B w 。
(3) Treatment of cumulative gas production
Cumulative gas production G to be measured in ground volume p Multiplying the natural gas volume coefficient to obtain cumulative gas production G measured in subsurface volume p B g 。
(4) Data processing
Cumulative water yield W to be measured in subsurface volume p B w With cumulative gas production G measured in subsurface volumes p B g Summing, as shown in FIG. 1, the summed value is then summed with the cumulative oil production N measured in subsurface volume p B o Plotted in a semi-logarithmic coordinate system, the accuracy of the data fitting R according to FIG. 1 2 The data fitting result is better, and the gas drive characteristic curve function is as follows:
ln(W p B w +G p B g )＝0.0031N p B o +2.9041
wherein: w (W) p The cumulative water yield measured by the ground quality is ten thousand tons;
B w -formation water volume coefficient, dimensionless;
G p cumulative gas production measured in terms of ground volume, yi Fang;
B g -natural gas volumetric coefficient, dimensionless;
N p -cumulative oil production measured in terms of ground mass, ten thousand tons;
B o -crude oil volume coefficient, dimensionless.
Substituting the obtained fitting coefficient and fitting constant into formula (9) to obtain
For the gas drive limit condition, the gas drive limit water vapor content is 98%, and the water vapor oil ratio R at the moment wgo A value 49; and combining the values a and b in the gas drive characteristic curve function, so as to obtain the 2181.96-square gas drive limit cumulative oil production.
(5) Calculating gas drive recovery ratio
And (3) accumulating oil according to the gas flooding limit calculated in the step (4), and calculating the gas flooding recovery ratio of the Y oil reservoir to 73.32% by combining the geological reserve 2975.97 square (underground volume unit) of the Y oil reservoir.
The invention also discloses a data processing device of the recovery ratio of the gas-drive reservoir, which comprises:
the storage module is used for storing accumulated oil yield measured by ground mass, accumulated water yield measured by ground mass and accumulated gas yield measured by ground volume; the first processing module is used for calculating the accumulated oil yield measured by the underground volume according to the accumulated oil yield measured by the ground mass; the second processing module is used for calculating the accumulated water yield measured by the underground volume according to the accumulated water yield measured by the ground mass; the third processing module is used for calculating the cumulative gas yield measured by the underground volume according to the cumulative gas yield measured by the ground volume; the fourth processing module is used for solving a fitting coefficient and a fitting constant according to the accumulated oil yield measured by the underground volume, the accumulated water yield measured by the underground volume and the accumulated gas yield measured by the underground volume; the fifth processing module is used for calculating the gas-drive cumulative oil yield measured by the underground volume according to the fitting coefficient, the fitting constant and the water-gas-oil ratio; and the sixth processing module is used for calculating the gas flooding recovery ratio according to the gas flooding limit accumulated oil production and combining the reservoir geological reserves. By connecting several module units, the gas recovery ratio can be calculated rapidly.
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, etc.) having computer-usable program code embodied therein.
The method of calculating the recovery ratio of the gas reservoir according to the invention may be stored in a computer readable storage medium if implemented in the form of a software functional unit and sold or used as a stand alone product. Based on such understanding, the present invention may implement all or part of the flow of the method of the above embodiment, or may be implemented by a computer program to instruct related hardware, where the computer program may be stored in a computer readable storage medium, and when the computer program is executed by a processor, the computer program may implement the steps of each of the method embodiments described above. Wherein the computer program comprises computer program code which may be in source code form, object code form, executable file or some intermediate form etc. Computer-readable storage 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. It should be noted that the computer readable medium contains content that can be appropriately scaled according to the requirements of jurisdictions in which such content is subject to legislation and patent practice, such as in certain jurisdictions in which such content is subject to legislation and patent practice, the computer readable medium does not include electrical carrier signals and telecommunication signals. The computer storage media may be any available media or data storage device that can be accessed by a computer, including, but not limited to, magnetic storage (e.g., floppy disks, hard disks, magnetic tape, magneto-optical disks (MOs), etc.), optical storage (e.g., CD, DVD, BD, HVD, etc.), and semiconductor storage (e.g., ROM, EPROM, EEPROM, nonvolatile storage (NANDFLASH), solid State Disk (SSD)), etc.
The invention also provides a computer device comprising a memory, a processor and a computer program stored in the memory and capable of running on the processor, wherein the processor executes the computer program to realize the steps of the method for calculating the recovery ratio of the gas reservoir. The processor may be a central processing unit (CentralProcessingUnit, CPU), but may also be other general purpose processors, digital signal processors (DigitalSignalProcessor, DSP), application specific integrated circuits (ApplicationSpecificIntegratedCircuit, ASIC), off-the-shelf programmable gate arrays (Field-ProgrammableGateArray, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like.
The present invention is not limited to the above-described embodiments, and various modifications and variations can be made by those skilled in the art without inventive effort, and are intended to be covered by the appended claims.
Claims (6)
1. The calculation method of the recovery ratio of the gas-displacement reservoir is characterized by comprising the following steps:
s1, determining accumulated oil yield measured by underground volume according to the accumulated oil yield measured by ground mass; the method comprises the following steps: dividing the accumulated oil yield measured by the ground mass by the density of crude oil, and multiplying the accumulated oil yield by the volume coefficient of crude oil to obtain the accumulated oil yield measured by the underground volume;
determining a cumulative water yield measured in subsurface volume from the cumulative water yield measured in ground mass; the method comprises the following steps: dividing the accumulated water yield measured by the ground mass by the formation water density, and multiplying the accumulated water yield by the formation water volume coefficient to obtain the accumulated water yield measured by the underground volume;
determining the cumulative gas production measured in the subsurface volume from the cumulative gas production measured in the surface volume; the method comprises the following steps: multiplying the cumulative gas yield measured by the ground volume by a natural gas accumulation coefficient to obtain the cumulative gas yield measured by the underground volume;
s2, obtaining a gas-drive characteristic curve function according to accumulated oil yield measured by the underground volume, accumulated water yield measured by the underground volume and accumulated gas yield measured by the underground volume, wherein the gas-drive characteristic curve function is as follows:
ln(W p B w +G p B g )＝bN p B o +a (1)
wherein: w (W) p The accumulated water yield measured by the ground quality is ten thousand tons;
B w is a stratum water volume coefficient, and is dimensionless;
G p the method is a hundred million parties for accumulating gas yield measured by the ground volume;
B g is a natural gas volume coefficient, and is dimensionless;
N p the accumulated oil yield measured by the ground quality is ten thousand tons;
B o is the volume coefficient of crude oil, and is dimensionless;
b is a fitting coefficient;
a is a fitting constant;
determining a fitting coefficient b and a fitting constant a according to a class of gas-driven characteristic curve functions;
s3, according to the fitting coefficient b, the fitting constant a and the water-gas-oil ratio R wgo Calculating gas-drive cumulative oil production N measured by underground volume p2 The formula is:
the specific deduction process is as follows:
taking logarithms from two sides of a gas drive characteristic curve function to obtain the following expression:
considering the cumulative yield versus time derivative as the average daily or monthly yield, then:
substituting formulas (3) to (5) into formula (2), and simplifying and arranging formula (2) into:
simplifying and taking the logarithm:
definition of the Water-gas-oil ratio R wgo The water-gas-oil ratio function is obtained as the ratio of daily or monthly water yield, gas yield and daily or monthly oil yield, and is as follows:
the combination of formulas (6) and (7) and formula (1) gives the logarithmic result:
lnR wgo ＝lnb+a+bN p B o (8)
solving the accumulated oil yield of the gas flooding:
reversely solving the gas flooding accumulated oil yield measured by underground volume under a certain water-gas-oil ratio condition according to a water-gas-oil ratio function:
according to the definition of the water content, the water content is defined as the ratio of the daily or monthly water yield, the gas yield and the total yield:
combining equation (10) and equation (7) to obtain
And S4, under the gas flooding limit condition, acquiring the gas flooding limit water vapor content, calculating the gas flooding limit cumulative oil yield based on a formula (9) of the gas flooding cumulative oil yield, and calculating the gas flooding oil reservoir recovery ratio by combining the oil reservoir geological reserves.
2. The method for calculating the recovery ratio of the gas-drive reservoir according to claim 1, wherein in the step S2, a gas-drive characteristic curve function is obtained by the following steps:
and summing the accumulated water yield measured by the underground volume and the accumulated gas yield measured by the underground volume, and drawing the sum and the accumulated gas yield measured by the underground volume under a semi-logarithmic coordinate system to obtain a gas drive characteristic curve function.
3. The method for calculating the recovery ratio of the gas-drive reservoir according to claim 1, wherein the step S4 is specifically: dividing the gas flooding limit accumulated oil yield by the oil reservoir geological reserve to obtain the gas flooding reservoir recovery ratio.
4. A data processing apparatus for implementing the method of any one of claims 1-3 for recovery of a reservoir for gas displacement, comprising:
the storage module is used for storing accumulated oil yield measured by ground mass, accumulated water yield measured by ground mass and accumulated gas yield measured by ground volume;
the first processing module is used for calculating the accumulated oil yield measured by the underground volume according to the accumulated oil yield measured by the ground mass;
the second processing module is used for calculating the accumulated water yield measured by the underground volume according to the accumulated water yield measured by the ground mass;
the third processing module is used for calculating the cumulative gas yield measured by the underground volume according to the cumulative gas yield measured by the ground volume;
the fourth processing module is used for solving a fitting coefficient and a fitting constant according to the accumulated oil yield measured by the underground volume, the accumulated water yield measured by the underground volume and the accumulated gas yield measured by the underground volume;
the fifth processing module is used for calculating the gas-drive cumulative oil yield measured by the underground volume according to the fitting coefficient, the fitting constant and the water-gas-oil ratio;
and the sixth processing module is used for calculating the gas flooding limit cumulative oil yield based on the gas flooding cumulative oil yield and calculating the gas flooding oil reservoir recovery ratio by combining the oil reservoir geological reserves.
5. A computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor, when executing the computer program, carries out the steps of the method for calculating the recovery of a gas reservoir according to any one of claims 1 to 3.
6. A computer readable storage medium storing a computer program, characterized in that the computer program when executed by a processor implements the steps of the method of calculating the recovery ratio of a gas reservoir according to any one of claims 1 to 3.
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