CN112966978A - Calibration method for oil reservoir gas drive recovery ratio, data processing device, computer equipment and readable storage medium - Google Patents

Calibration method for oil reservoir gas drive recovery ratio, data processing device, computer equipment and readable storage medium Download PDF

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CN112966978A
CN112966978A CN202110362450.5A CN202110362450A CN112966978A CN 112966978 A CN112966978 A CN 112966978A CN 202110362450 A CN202110362450 A CN 202110362450A CN 112966978 A CN112966978 A CN 112966978A
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陶正武
陈江林
赵行
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Abstract

The invention belongs to the technical field of recovery ratio calibration, and discloses a calibration method of oil reservoir gas drive recovery ratio, a data processing device, computer equipment and a readable storage medium, wherein the method comprises the following steps: s1, obtaining a class-I gas flooding characteristic curve function according to the oil production quantity measured by the underground volume, the water production quantity measured by the underground volume and the gas production quantity measured by the underground volume, and obtaining a fitting coefficient and a fitting constant according to the class-I gas flooding characteristic curve function; s2, calculating the gas flooding limit accumulated oil yield according to the fitting coefficient, the fitting constant and the oil content under the gas flooding limit condition; and S3, accumulating oil according to the gas drive limit, and calculating the gas drive recovery ratio by combining the oil reservoir geological reserve. The method has reliable principle and high acquisition precision, can realize accurate calibration of gas drive recovery ratio, and acquires the gas drive recoverable reserve by calibrating the gas drive recovery ratio of the oil reservoir so as to guide the establishment of an oil reservoir gas drive development scheme, the calibration of the gas drive oil reservoir recoverable reserve and the SEC reserve evaluation.

Description

Calibration method for oil reservoir gas drive recovery ratio, data processing device, computer equipment and readable storage medium
Technical Field
The invention relates to the technical field of recovery ratio calibration, in particular to a calibration method for the recovery ratio of oil reservoir gas flooding, a data processing device, computer equipment and a readable storage medium.
Background
The oil reservoir in the later stage of water injection development is in a double-high-low stage of high comprehensive water content, high extraction degree and low oil extraction speed, and the fine water flooding is continuously carried out, so that the potential is small, and the stable production situation is passive; thus, part of the reservoir is shifted to gas injection development. The conventional water drive curve method and water drive plate are not suitable for calibrating the gas drive recovery ratio, so that a calibration method for the gas drive recovery ratio of an oil reservoir is necessary.
Disclosure of Invention
One of the purposes of the invention is to provide a calibration method for the gas drive recovery ratio of an oil reservoir, which has high calculation precision and can realize accurate calibration of the gas drive recovery ratio of the oil reservoir.
The invention also aims to provide a data processing device for the gas drive recovery ratio of the oil reservoir.
It is a further object of the present invention to provide a computer apparatus.
It is a fourth object of the present invention to provide a readable storage medium.
The invention is realized by the following technical scheme:
a calibration method for oil reservoir gas drive recovery ratio comprises the following processes:
s1, obtaining a gas flooding 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, wherein the gas flooding characteristic curve function is as follows:
Figure BDA0003006103700000011
in the formula: n is a radical ofpTen thousand tons of oil are produced by the weight of the ground;
Bothe volume coefficient of the crude oil is dimensionless;
Wpthe water yield is measured by the ground mass and is ten thousand tons;
Bwis the volume coefficient of formation water, and has no dimension;
Gpthe gas production is measured by the ground volume, i.e. hundreds of millions of squares;
Bgthe natural gas volume coefficient 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 drive characteristic curve functions;
s2, calculating the gas drive accumulated oil yield N 'measured by underground volume according to the fitting coefficient b, the fitting constant a and the oil content'pB'o；
Figure BDA0003006103700000021
Wherein f is0The oil content is;
and S3, calculating the gas flooding recovery ratio according to the gas flooding limit accumulated oil yield and by combining the oil reservoir geological reserve.
Further, in S1, the process of obtaining the accumulated oil amount measured by the underground volume is specifically:
and dividing the accumulated oil yield measured by the ground mass by the density of the crude oil, and multiplying by the volume coefficient of the crude oil to obtain the accumulated oil yield measured by the underground volume.
Further, in S1, the process of obtaining the accumulated water yield measured by the underground volume specifically includes:
and dividing the accumulated water yield measured by the ground quality by the density of the formation water, and multiplying the obtained product by the volume coefficient of the formation water to obtain the accumulated water yield measured by the underground volume.
Further, in S1, the process of obtaining the accumulated gas production measured by the underground volume specifically includes:
and multiplying the accumulated gas production measured by the ground volume by the natural gas volume coefficient to obtain the accumulated gas production measured by the underground volume.
Further, in S1, the process of obtaining a class of gas drive characteristic curve function is specifically:
cumulative oil production N to be measured in subsurface volumepBoAccumulated water yield W of underground volume meteringpBwAnd the accumulated gas production G measured by underground volumepBgSumming, and dividing the sum byNpBoFinally, the quotient is compared with NpBo、WpBwAnd GpBgAnd drawing the sum of the three values in a rectangular coordinate system to obtain a class of gas drive characteristic curve functions.
Further, S3 specifically is: and (4) dividing the gas flooding limit accumulative oil by the oil reservoir geological reserve to obtain the gas flooding recovery ratio.
The invention also discloses a data processing device for the gas drive recovery ratio of the oil reservoir, which comprises the following components:
the storage module is used for storing the accumulated oil yield measured by mass, the accumulated water yield measured by mass and the 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 quality;
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 quality;
the third processing module is used for calculating the accumulated gas production measured by the underground volume according to the accumulated gas production measured by the ground volume;
the fourth processing module is used for calculating and taking out 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 accumulated oil production measured by the underground volume according to the fitting coefficient, the fitting constant and the oil content;
and the sixth processing module is used for accumulating oil according to the gas drive limit and calculating the gas drive recovery ratio by combining the geological reserves of the oil reservoir.
The invention also discloses a computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the calibration method for the reservoir gas drive recovery factor when executing the computer program.
The invention also discloses a computer readable storage medium storing a computer program which, when executed by a processor, implements the steps of the calibration method for gas drive recovery of a reservoir.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention discloses a calibration method of oil reservoir gas drive recovery ratio, a data processing device, a computer device and a readable storage medium, wherein the final oil reservoir gas drive recovery ratio can be obtained through calculation according to the accumulative oil yield measured by ground quality, the accumulative water yield measured by ground quality and the accumulative gas yield measured by ground volume, a specific calculation formula is given, the oil reservoir gas drive recovery ratio can be rapidly calculated through the existing data, great convenience is provided for workers, the principle of the method is reliable, the calculation precision is high, and the accurate calibration of the gas drive recovery ratio can be realized. And by calibrating the gas drive recovery ratio of the oil reservoir, the gas drive recoverable reserve is obtained so as to guide the establishment of an oil reservoir gas drive development scheme, the calibration of the gas drive oil reservoir recoverable reserve and the SEC reserve evaluation.
Drawings
FIG. 1 is a functional diagram of a gas drive characteristic curve of the X reservoir.
Detailed Description
The invention discloses a calibration method for the recovery ratio of oil reservoir gas flooding, which comprises the following steps:
s1, calculating the oil production based on underground volume, the water production based on underground volume and the gas production based on underground volume
1.1 oil cumulative treatment
Because the oil yield N is accumulated in the oil field development comprehensive data sheetpMeasured in units of ground mass (ten thousand tons), which need to be converted into units of underground volume (ten thousand squares); the method comprises dividing the accumulated oil mass measured by ground mass unit by crude oil density, and multiplying by crude oil volume coefficient to obtain the accumulated oil mass N measured by underground volumepBo。
1.2 treatment of Water production
Similarly, the accumulated water yield W will be measured in units of ground masspIs divided byThe density of the formation water is multiplied by the volume coefficient of the formation water, and then the accumulated water yield W measured by the underground volume (ten thousand square)pBw。
1.3 gas production related treatment
Due to gas production GpThe oil quantity and water yield are measured in units of hundred million square on the ground, and need to be converted into underground volume in order to be unified with the measurement units of the oil quantity and the water yield; the specific method is to multiply the natural gas volume coefficient to obtain the accumulated gas production G measured by underground volume (ten thousand square)pBg。
S2, data processing
2.1 cumulative oil production N to be measured in subsurface volumepBoAccumulated water yield W of underground volume meteringpBwAnd the accumulated gas production G measured by underground volumepBgSumming, and dividing the sum by the cumulative oil production NpBoFinally, the quotient and the accumulated oil production N are calculatedpBoAccumulated water yield WpBwAccumulated gas production GpBgAnd drawing the summation value under a rectangular coordinate system to obtain a gas drive characteristic curve function:
Figure BDA0003006103700000051
in the formula: wp-cumulative water production measured in ground mass, ten thousand tons;
Bw-formation water volume factor, dimensionless;
Gp-gas production in billions measured in ground volume;
Bg-natural gas volume factor, dimensionless;
Np-cumulative oil production measured as ground mass, ten thousand tons;
Bo-crude oil volume factor, dimensionless;
b-fitting coefficient;
a-fitting constant.
2.2 take the differential, derivative and simplify:
differentiating the gas drive characteristic curve function to obtain the following expression:
Figure BDA0003006103700000052
derivative calculation is performed on differential expression (2):
Figure BDA0003006103700000053
considering the time derivative of the cumulative yield as daily or monthly average yield, namely:
Figure BDA0003006103700000061
Figure BDA0003006103700000062
Figure BDA0003006103700000063
substituting the formulas (4) to (6) into the formula (3) to solve the following:
Figure BDA0003006103700000064
2.3 simultaneous solution
The formula (1) can be obtained after deformation:
Figure BDA0003006103700000065
equation (8) is associated with equation (7), and the solution is:
Figure BDA0003006103700000066
2.4 simplification solution
Defined in terms of oil content:
Figure BDA0003006103700000067
equation (10) in combination with equation (9) reduces the solution to obtain the gas flooding cumulative oil production measured in subsurface volume:
Figure BDA0003006103700000068
the water-gas rate under the gas flooding limit condition is 98 percent, and the oil rate is 2 percent; and substituting the values a and b in the formula (1) into the formula (11) to obtain the gas drive limit accumulated produced oil.
S3, gas drive recovery ratio calibration
And (4) according to the gas flooding limit accumulated oil calculated in the step (S2), combining the specific oil reservoir geological reserve, and dividing the gas flooding limit accumulated oil by the oil reservoir geological reserve so as to calibrate the gas flooding recovery ratio.
The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.
The invention is further explained below by taking the actual production data of the X oil reservoir gas drive as an example:
(1) treatment for oil production
The cumulative oil production N to be measured by the ground masspDividing by the density of the crude oil and multiplying by the volume factor of the crude oil to obtain the cumulative oil yield N measured by the underground volumepBo。
(2) Accumulated water yield treatment
Similarly, the accumulated water yield W will be measured by the ground masspDividing by the density of the formation water and multiplying by the volume coefficient of the formation water to obtain the accumulated water yield W measured by the underground volumepBw。
(3) Gas production process
Will be measured by the ground volumeGas production GpMultiplying by natural gas volume factor to obtain the accumulated gas production G measured by underground volumepBg。
(4) Data processing
Cumulative oil production N to be measured in subsurface volumepBoWater production capacity W measured by underground volumepBwAnd the accumulated gas production G measured by underground volumepBgSumming, and dividing the sum by the cumulative oil production NpBoFinally, the quotient is compared with NpBo、WpBwAnd GpBgThe sum of the three values is plotted in a rectangular coordinate system, as shown in fig. 1; fitting accuracy R according to the data of FIG. 12The data fitting result is better, and the gas drive characteristic curve function is as follows:
Figure BDA0003006103700000071
in the formula:
Np-cumulative oil production measured as ground mass, ten thousand tons;
Bo-crude oil volume factor, dimensionless;
Gp-gas production in billions measured in ground volume;
Bg-natural gas volume factor, dimensionless;
Wp-cumulative water production measured in ground mass, ten thousand tons;
Bwformation water volume factor, dimensionless.
From this fitting equation, a fitting coefficient of 0.0004 and a fitting constant of 0.8474 are obtained, and then the fitting coefficient is substituted into equation (11), and the following results are obtained:
Figure BDA0003006103700000081
the water-gas ratio under the gas flooding limit condition is 98 percent, and the oil ratio is 2 percent, namely f02 percent; x reservoir crude oil volume systemNumber BoValue 1.071, substituting into the above formula
Figure BDA0003006103700000082
In (2), the gas flooding limit in units of underground volume is calculated to accumulate 2163.18 ten thousand squares of oil.
(8) Gas drive recovery ratio calibration
And (4) according to the gas flooding limit accumulated oil calculated in the step (7), calibrating the gas flooding recovery ratio of the X oil reservoir to be 72.69% by combining with the geological reserve of the X oil reservoir of 2975.97 ten thousand squares (underground volume unit).
The invention also discloses a data processing device for the gas drive recovery ratio of the oil reservoir, which comprises a storage module, a first processing module, a second processing module, a third processing module, a fourth processing module and a fifth processing module. The storage module is used for storing the accumulated oil yield measured by mass, the accumulated water yield measured by mass and the 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 quality; 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 quality; the third processing module is used for calculating the accumulated gas production measured by the underground volume according to the accumulated gas production measured by the ground volume; the fourth processing module is used for calculating and taking out 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 accumulated oil production measured by the underground volume according to the fitting coefficient, the fitting constant and the oil content; and the sixth processing module is used for accumulating oil according to the gas drive limit and calculating the gas drive recovery ratio by combining the geological reserves of the oil reservoir. The gas drive recovery rate can be rapidly calculated through the connection of the plurality of module units.
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 calibration method for the recovery ratio of the oil reservoir gas flooding can be stored in a computer readable storage medium if the calibration method is realized in the form of a software functional unit and is sold or used as an independent product. Based on such understanding, all or part of the flow of the method according to the embodiments of the present invention may also be implemented by a computer program, which may be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method embodiments may be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an 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 may contain content that is subject to appropriate increase or decrease as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media does not include electrical carrier signals and telecommunications signals as is required by legislation and patent practice. The computer storage medium may be any available medium or data storage device that can be accessed by a computer, including but not limited to magnetic memory (e.g., floppy disk, hard disk, magnetic tape, magneto-optical disk (MO), etc.), optical memory (e.g., CD, DVD, BD, HVD, etc.), and semiconductor memory (e.g., ROM, EPROM, EEPROM, nonvolatile memory (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 executable on the processor, the processor when executing the computer program performing the steps of the calibration method for reservoir gas drive recovery. The processor may be a Central Processing Unit (CPU), other general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, etc.
The invention is not limited to the embodiments described above, and various modifications and changes that can be made by those skilled in the art without inventive work are covered by the claims of the present invention.

Claims (9)

1. A calibration method for the recovery ratio of oil reservoir gas flooding is characterized by comprising the following steps:
s1, obtaining a gas flooding 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, wherein the gas flooding characteristic curve function is as follows:
Figure FDA0003006103690000011
in the formula: n is a radical ofpTen thousand tons of oil are produced by the weight of the ground;
Bothe volume coefficient of the crude oil is dimensionless;
Wpthe water yield is measured by the ground mass and is ten thousand tons;
Bwis the volume coefficient of formation water, and has no dimension;
Gpthe gas production is measured by the ground volume, i.e. hundreds of millions of squares;
Bgthe natural gas volume coefficient 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 drive characteristic curve functions;
s2, calculating the gas drive accumulated oil yield N 'measured by underground volume according to the fitting coefficient b, the fitting constant a and the oil content'pB'o；
Figure FDA0003006103690000012
Wherein f is0The oil content is;
and S3, calculating the gas flooding recovery ratio according to the gas flooding limit accumulated oil yield and by combining the oil reservoir geological reserve.
2. The method for calibrating the recovery factor of a reservoir gas flooding as claimed in claim 1, wherein in S1, the process of obtaining the cumulative oil production measured by the underground volume is as follows:
and dividing the accumulated oil yield measured by the ground mass by the density of the crude oil, and multiplying by the volume coefficient of the crude oil to obtain the accumulated oil yield measured by the underground volume.
3. The method for calibrating the recovery factor of a reservoir gas flooding as claimed in claim 1, wherein in S1, the process of obtaining the water accumulated by measuring the underground volume is as follows:
and dividing the accumulated water yield measured by the ground quality by the density of the formation water, and multiplying the obtained product by the volume coefficient of the formation water to obtain the accumulated water yield measured by the underground volume.
4. The method for calibrating the recovery factor of a reservoir gas flooding as claimed in claim 1, wherein in S1, the process of obtaining the gas production measured by the underground volume is specifically as follows:
and multiplying the accumulated gas production measured by the ground volume by the natural gas volume coefficient to obtain the accumulated gas production measured by the underground volume.
5. The method for calibrating the recovery ratio of a gas flooding of a reservoir according to claim 1, characterized in that, in S1, the obtaining process of a gas flooding characteristic curve function is as follows:
cumulative oil production N to be measured in subsurface volumepBoAccumulated water yield W of underground volume meteringpBwAnd the accumulated gas production G measured by underground volumepBgSumming, dividing the sum by NpBoFinally, the quotient is compared with NpBo、WpBwAnd GpBgAnd drawing the sum of the three values in a rectangular coordinate system to obtain a class of gas drive characteristic curve functions.
6. The calibration method for recovery factor of reservoir gas flooding as claimed in claim 1, wherein S3 is specifically: and (4) dividing the gas flooding limit accumulative oil by the oil reservoir geological reserve to obtain the gas flooding recovery ratio.
7. A data processing apparatus for gas drive recovery of a reservoir, comprising:
the storage module is used for storing 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;
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 quality;
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 quality;
the third processing module is used for calculating the accumulated gas production measured by the underground volume according to the accumulated gas production measured by the ground volume;
the fourth processing module is used for calculating and taking out 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 accumulated oil production measured by the underground volume according to the fitting coefficient, the fitting constant and the oil content;
and the sixth processing module is used for accumulating oil according to the gas drive limit and calculating the gas drive recovery ratio by combining the geological reserves of the oil reservoir.
8. 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 performs the steps of the calibration method for reservoir gas drive recovery as defined in any one of claims 1 to 6.
9. A computer-readable storage medium, having a computer program stored thereon, wherein the computer program, when being executed by a processor, is adapted to carry out the steps of the method for calibration of reservoir gas drive recovery as defined in any one of claims 1 to 6.
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