CN113011736A - Method and device for obtaining calculation standard of oil and gas well storage capacity based on dynamic analysis - Google Patents

Method and device for obtaining calculation standard of oil and gas well storage capacity based on dynamic analysis Download PDF

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CN113011736A
CN113011736A CN202110287029.2A CN202110287029A CN113011736A CN 113011736 A CN113011736 A CN 113011736A CN 202110287029 A CN202110287029 A CN 202110287029A CN 113011736 A CN113011736 A CN 113011736A
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李斌
吕海涛
彭军
杨素举
康仁东
夏青松
张昆
周彦
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Sinopec Northwest Oil Field Co
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Abstract

The invention discloses a method and a device for obtaining the calculation standard of the storage capacity of an oil and gas well based on dynamic analysis, wherein the method comprises the following steps: s1: acquiring index information of the single-well economic ultimate yield as input, and calculating the single-well economic ultimate yield according to the time scale according to the input index information of the single-well economic ultimate yield; s2: and calculating and recovering the initial yield of the single well investment according to a dynamic storage capacity starting calculation standard calculation model based on the single well economic ultimate yield, wherein the recovered initial yield of the single well investment, namely the storage capacity starting calculation standard, is output. The characteristic of natural decrement of the oil-gas well is fully considered, exponential decrement is taken as a constraint model, and the economic limit initial yield (storage capacity calculation standard) is obtained by reverse deduction according to the economic limit annual yield; the economic value of two products of crude oil and natural gas is also fully considered.

Description

Method and device for obtaining calculation standard of oil and gas well storage capacity based on dynamic analysis
Technical Field
The invention relates to the technical field of oil and gas exploration and development, in particular to a method and a device for obtaining a calculation standard of oil and gas well storage capacity based on dynamic analysis.
Background
The storage quantity calculation standard (i.e. industrial oil-gas flow standard) is the lower limit of daily output of a single well of oil and natural gas under different burial depths of an oil (gas) reservoir, and is the lowest economic condition to be achieved by carrying out initial estimation. Although the general storage calculation standard is given in the geological and mineral industry standard of the people's republic of China, "oil and gas reserves estimation Specification (DZ/T0217-2020)" (Specification) "5.1.3, the cost, expense, sale price and the like of the oil and gas reservoirs in different regions and different depths are greatly different, so that the recommended calculation standard has great inadaptability. Meanwhile, the basic principle of calculating the storage amount is synchronously given in the specification: the lower limit of daily output of a single well only recovering the investment of a development well can be calculated in each region according to the local price, the cost and the like; the average operating cost and oil price can also be used for obtaining the daily output lower limit of the single well with the average well depth, and then the daily output lower limit of the single well with different well depths can be obtained according to the actual well depth. The formula is as follows: the lower daily production limit (ton/day or thousand cubic meters/day) for an oil or gas individual well is a fixed cost (yuan/day)/(sales price-tax-variable cost (ton/day or thousand cubic meters/day).
The prior art methods for obtaining a calculation standard for storage capacity are derived based on the above principles, and are generally as follows:
Figure BDA0002980893700000011
in the formula: q. q.soeThe daily output of the oil well is calculated from the single well storage capacity, and ton/day;
Ipdevelopment well construction investment, ten thousand yuan/port (investment for single well drilling, oil production and ground);
PT-recovery period of investment, year (recovery period of investment);
Cfofixed cost of oil well production, ten thousand yuan per year (calculated from cost table);
Rtoil well annual production rate, days/year (annual production days);
P0dcrude oil sales price, yuan/ton (take the specified value);
Taxocrude oil integrated tax, yuan/ton (take the specified value);
d-comprehensive annual decrement rate,%;
CVOvariable cost of the well, yuan/ton (calculated from cost-cost tables);
R0crude oil commodity rate,% (from actual values).
Then, the method for obtaining the storage calculation standard in the prior art has the following main problems: (1) there are hard requirements for the return on investment (PT) and it needs to be given in advance, typically 8 years. This is not suitable for some production wells with long-term low and stable yield, and in addition, no mandatory requirements are made on the investment recovery period in the 'Specification'. (2) Although the formula applies an annual declining parameter, the calculated yield (Qoe) is calculated to be the average yield for the first year, rather than the initial steady state yield. Therefore, when the rate of decrease is large, the error thereof is large. (3) Typically only for single resource type production wells, and becomes unsuitable when the oil and gas are all of higher production (high production gas-oil ratio wells, high condensate gas wells).
Disclosure of Invention
The invention aims to solve the technical problems that a method for acquiring the storage capacity calculation standard in the prior art is low in efficiency and large in calculation error, and aims to provide a method and a device for acquiring the storage capacity calculation standard of an oil and gas well based on dynamic analysis.
The invention is realized by the following technical scheme:
a method for obtaining calculation-starting standard of oil and gas well storage capacity based on dynamic analysis comprises the following steps:
s1: acquiring index information of the single-well economic ultimate yield as input, and calculating the single-well economic ultimate yield according to the time scale according to the input index information of the single-well economic ultimate yield;
s2: and calculating and recovering the initial yield of the single well investment according to a dynamic storage capacity starting calculation standard calculation model based on the single well economic ultimate yield, wherein the recovered initial yield of the single well investment, namely the storage capacity starting calculation standard, is output.
Further, the index information of the economic ultimate yield of the single well comprises a crude oil selling price, a crude oil comprehensive tax, a crude oil commercialization rate, an oil unit yield variable cost, a natural gas selling price, a natural gas comprehensive tax, a natural gas selling commercialization rate, a natural gas unit yield variable cost, a production gas-oil ratio, an annual comprehensive decline rate and a single well fixed annual cost.
Further, the single-well economic ultimate yield calculated according to the time scale comprises single-well economic ultimate annual yield, single-well economic ultimate monthly yield and single-well economic ultimate daily yield; step S1 includes the following substeps:
S11：according to the index information of the economic ultimate yield of the single well, calculating the partial net income V of each ton of oil yield by adopting the following formulauo：
Vuo＝(Po-TCo)·SRo-Cvo
In the formula, PoA sales price for crude oil; TC (tungsten carbide)oThe crude oil comprehensive tax is obtained; SRoThe commercialization rate of crude oil; cvoVariable cost per unit of oil production;
s12: according to the index information of the economic limit yield of the single well, calculating the net income V of the natural gas yield part per thousand squares by adopting the following formulaug：
Vug＝(Pg-TCg)·SRg-Cvg
In the formula, PgSales price for natural gas; TC (tungsten carbide)gIs a natural gas comprehensive tax; SRgCommercialization rates for natural gas sales; cvgVariable cost per unit of production of natural gas;
s13: calculating the equivalent net income V of each ton of oil gas by using the following formula according to the net income of each ton of oil production part and the net income of each thousand square of natural gas production partuog：
Figure BDA0002980893700000031
In the formula, GOR is the initial stable production gas-oil ratio; wherein if the economic value of gas production is neglected, let Vuog＝Vuo(ii) a If the economic value of the oil production part is neglected, V is ordereduog＝Vug；
S14: calculating the economic limit yield Q of the single well according to the time scale by using the following formula according to the equivalent net income of oil gas per tondog：
Figure BDA0002980893700000032
In the formula, CfxFor oil and gas according to time scaleWell opening fixed cost; vuogNet income per unit oil and gas yield; qdogThe yield is the economic limit.
Further, the step S2 of calculating the initial annual output of the single well investment in the step S2 includes the following sub-steps:
s21: solving the following formula according to the acquired index information of the single-well economic ultimate yield and the single-well economic ultimate yield calculated according to the time scale in the step S1, and calculating the total production year n;
Figure BDA0002980893700000033
in the formula, DcaThe annual comprehensive reduction rate is small; dtaThe annual discount rate is small;
s22: according to step S21, the initial annual production from calculation is calculated using the following formula;
Figure BDA0002980893700000034
in the formula, QiyogCalculating the initial annual output for the storage capacity, ton equivalent/year;
s23: according to step S22, the daily production Q is initially calculated using the following formulaiog；
Figure BDA0002980893700000035
Figure BDA0002980893700000036
In the formula, QiogCalculating the lower limit output for the reserves, ton equivalent/day;
s24: converting the equivalent oil-gas yield into the daily oil yield and the daily gas yield according to the ratio of produced gas to oil according to the initial daily gas yield:
Figure BDA0002980893700000041
Figure BDA0002980893700000042
in the formula, QioCalculating the yield of oil per day from the oil storage; qigCalculate the production for the natural gas reserves, square/day.
Further, when the single-well economic ultimate yield is the single-well economic ultimate monthly yield according to the time scale, the step S2 of calculating the initial monthly yield of the recovered single-well investment before the step S21 further includes S20, and the step S20 includes:
s201: the annual natural decrement rate is converted into the monthly natural decrement rate, and the annual natural decrement rate is converted into the monthly natural decrement rate by using the following formula because the method is specified as an exponential decrement model;
Figure BDA0002980893700000043
in the formula, DcmMonthly decrement rate, decimal; dcaThe natural annual rate of decline, decimal;
s202: converting the annual discount rate into a monthly discount rate, and converting the annual discount rate Dta into a daily discount rate Dtm by using the following formula;
Figure BDA0002980893700000044
in the formula, DtmThe monthly discount rate is decimal; dtaThe annual discount rate is decimal.
The other process steps calculate the economic ultimate monthly production for the single well, similar to the calculation of the economic ultimate annual production for the single well from step S21 to step S24 based on the e-model described above.
Further, when the single-well economic ultimate yield is calculated according to the time scale, step S2 of calculating the initial daily yield of the single-well investment before step S21 of recovering the single-well investment further includes S30, and step S30 includes:
s301: converting the annual comprehensive reduction rate into a daily reduction rate, and converting the annual natural reduction rate into the daily comprehensive reduction rate by using the following formula because the invention is specified as an exponential reduction model;
Figure BDA0002980893700000045
in the formula, DcdThe daily natural rate of decline, decimal; dcaThe natural annual rate of decline, decimal; pdaDays of annual production;
s302: converting the annual discount rate into a daily discount rate, and converting the annual discount rate Dta into a daily discount rate Dtd by using the following formula;
Figure BDA0002980893700000046
in the formula, DtdThe daily discount rate is decimal; dtaThe annual discount rate is decimal.
The other process steps calculate the economic ultimate daily production for the individual well, similar to the calculation of the economic ultimate annual production for the individual well based on the e-model steps S21 through S24 described above.
Further, the step S2 of calculating the initial annual production of the single well investment by the dynamic storage calculation standard model based on the n model, and when the single well economic ultimate production is calculated according to the time scale as the single well economic ultimate annual production, the step S2 of calculating the initial annual production of the single well investment recovery includes the following sub-steps:
s21: solving the following formula according to the acquired index information of the single-well economic ultimate yield and the single-well economic ultimate yield calculated according to the time scale in the step S1, and calculating the total production year n;
Figure BDA0002980893700000051
in the formula, DcaThe annual comprehensive reduction rate is small;
s22: according to step S21, the initial annual production from calculation is calculated using the following formula;
Qiyog＝Qdog·(1+Dca)n-1
in the formula, QiyogCalculating the initial annual output for the storage capacity, ton equivalent/year;
s23: according to step S22, the daily production Q is initially calculated using the following formulaiog；
Figure BDA0002980893700000052
Figure BDA0002980893700000053
In the formula, QiogCalculating the lower limit output for the reserves, ton equivalent/day;
s24: converting the equivalent oil-gas yield into the daily oil yield and the daily gas yield according to the ratio of produced gas to oil according to the initial daily gas yield:
Figure BDA0002980893700000054
Figure BDA0002980893700000055
in the formula, QioCalculating the yield of oil per day from the oil storage; qigCalculate the production for the natural gas reserves, square/day.
Further, when the single-well economic ultimate yield is the single-well economic ultimate monthly yield according to the time scale, the step S2 of calculating the initial monthly yield of the recovered single-well investment before the step S21 further includes S20, and the step S20 includes:
s201: the annual natural decrement rate is converted into the monthly natural decrement rate, and the annual natural decrement rate is converted into the monthly natural decrement rate by using the following formula because the method is specified as an exponential decrement model;
Figure BDA0002980893700000056
in the formula, DcmMonthly decrement rate, decimal; dcaThe natural annual rate of decline, decimal;
s202: converting the annual discount rate into a monthly discount rate, and converting the annual discount rate Dta into a daily discount rate Dtm by using the following formula;
Figure BDA0002980893700000061
in the formula, DtmThe monthly discount rate is decimal; dtaThe annual discount rate is decimal.
The other process steps calculate the economic ultimate monthly production for the single well, similar to the calculation of the economic ultimate annual production for the single well from step S21 to step S24 based on the n model described above.
Further, when the single-well economic ultimate yield is calculated according to the time scale, step S2 of calculating the initial daily yield of the single-well investment before step S21 of recovering the single-well investment further includes S30, and step S30 includes:
s301: the annual comprehensive reduction rate is converted into a daily reduction rate, and the annual natural reduction rate is converted into the daily comprehensive reduction rate by using the following formula because the invention is specified as an exponential reduction model;
Figure BDA0002980893700000062
in the formula, DcdThe daily natural rate of decline, decimal; dcaThe natural annual rate of decline, decimal; pdaDays of annual production;
s302: converting the annual discount rate into a daily discount rate, and converting the annual discount rate Dta into a daily discount rate Dtd by using the following formula;
Figure BDA0002980893700000063
in the formula, DtdThe daily discount rate is decimal; dtaThe annual discount rate is decimal.
The other process steps calculate the economic ultimate daily production of the single well, similar to the calculation of the economic ultimate annual production of the single well based on the n model steps S21 through S24 described above.
In another aspect, the present invention provides a device for obtaining an oil and gas well reserves calculation standard based on dynamic analysis, which supports the method for obtaining an oil and gas well reserves calculation standard based on dynamic analysis, and the device comprises:
the input unit is used for inputting the acquired index information of the economic limit yield of the single well;
the first calculation unit is used for calculating the single-well economic limit yield according to the time scale according to the input index information of the single-well economic limit yield; the single-well economic ultimate yield comprises single-well economic ultimate annual yield, single-well economic ultimate monthly yield and single-well economic ultimate daily yield;
the second calculation unit is used for calculating the initial yield of the single well investment to be recovered according to a dynamic storage capacity calculation standard calculation model based on the single well economic limit yield, wherein the initial yield of the single well investment to be recovered is a storage capacity calculation standard; the recovering of the initial single-well investment yield comprises recovering the initial annual single-well investment yield, recovering the initial monthly single-well investment yield and recovering the initial daily single-well investment yield;
and the output unit is used for outputting the initial yield of the recovered single well investment.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the method adopts a dynamic storage and quantity starting calculation standard calculation model based on an e model or a dynamic storage and quantity starting calculation standard calculation model based on an n model to calculate and withdraw the initial yield of the single well investment, namely the storage and quantity starting calculation standard.
2. The method (1) fully considers the characteristic of natural decrement of the oil-gas well, takes exponential decrement as a constraint model, and inversely obtains the economic limit initial yield (storage capacity calculation standard) according to the economic limit annual yield; (2) the economic value of two products of crude oil and natural gas is fully considered.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a flow chart of a method for obtaining a calculation standard of the storage capacity of an oil and gas well based on dynamic analysis.
Fig. 2 is a schematic structural diagram of the device for obtaining the calculation standard of the storage capacity of the oil-gas well based on dynamic analysis.
Detailed Description
Hereinafter, the term "comprising" or "may include" used in various embodiments of the present invention indicates the presence of the invented function, operation or element, and does not limit the addition of one or more functions, operations or elements. Furthermore, as used in various embodiments of the present invention, the terms "comprises," "comprising," "includes," "including," "has," "having" and their derivatives are intended to mean that the specified features, numbers, steps, operations, elements, components, or combinations of the foregoing, are only meant to indicate that a particular feature, number, step, operation, element, component, or combination of the foregoing, and should not be construed as first excluding the existence of, or adding to the possibility of, one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing.
In various embodiments of the invention, the expression "or" at least one of a or/and B "includes any or all combinations of the words listed simultaneously. For example, the expression "a or B" or "at least one of a or/and B" may include a, may include B, or may include both a and B.
Expressions (such as "first", "second", and the like) used in various embodiments of the present invention may modify various constituent elements in various embodiments, but may not limit the respective constituent elements. For example, the above description does not limit the order and/or importance of the elements described. The foregoing description is for the purpose of distinguishing one element from another. For example, the first user device and the second user device indicate different user devices, although both are user devices. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of various embodiments of the present invention.
It should be noted that: if it is described that one constituent element is "connected" to another constituent element, the first constituent element may be directly connected to the second constituent element, and a third constituent element may be "connected" between the first constituent element and the second constituent element. In contrast, when one constituent element is "directly connected" to another constituent element, it is understood that there is no third constituent element between the first constituent element and the second constituent element.
The terminology used in the various embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the various embodiments of the invention. As used herein, the singular forms are intended to include the plural forms as well, unless the context clearly indicates otherwise. Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which various embodiments of the present invention belong. The terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning that is consistent with their contextual meaning in the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein in various embodiments of the present invention.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1
As shown in fig. 1, the invention relates to a method for obtaining a calculation standard of oil and gas well reserves based on dynamic analysis, which comprises the following steps:
s1: acquiring index information of the single-well economic ultimate yield as input, and calculating the single-well economic ultimate yield according to the time scale according to the input index information of the single-well economic ultimate yield; the single-well economic ultimate yield calculated according to the time scale comprises single-well economic ultimate annual yield, single-well economic ultimate monthly yield and single-well economic ultimate daily yield;
s2: calculating and recovering the initial yield of the single well investment according to a dynamic storage capacity starting calculation standard calculation model based on the single well economic ultimate yield, wherein the recovered initial yield of the single well investment is the storage capacity starting calculation standard and is output; and the recovering of the initial single-well investment yield comprises recovering the initial annual single-well investment yield, recovering the initial monthly single-well investment yield and recovering the initial daily single-well investment yield.
In this embodiment, the index information of the economic ultimate yield of the single well includes a selling price of crude oil, a comprehensive tax of crude oil, a commercialization rate of crude oil, a variable cost of oil unit yield, a selling price of natural gas, a comprehensive tax of natural gas, a sales commercialization rate of natural gas, a variable cost of natural gas unit yield, a production gas-oil ratio, an annual comprehensive decline rate, and a fixed annual cost of the single well. Specifically, the method comprises the following steps:
the annual integrated reduction rate (Dca) is the difference between the next annual output and the previous annual output divided by the annual output value. Values can be analogized by developing wells of similar reservoirs. The invention provides for exponential decrements in units of decimals.
Figure BDA0002980893700000081
The fixed annual cost (Cfa) of a single well means that a fixed expense is paid every year for managing one oil and gas production well, and is irrelevant to the daily yield of oil and gas. The invention provides for taking fixed values, unit cells.
Variable cost (Cv) refers to the expense to be paid per unit of oil and gas production. And comprehensively taking values according to the management level, resource quality, traffic position and the like of each oil field enterprise. The invention provides a fixed value, unit/ton of oil gas equivalent.
Integrated Tax (TC) refers to the amount of tax paid per unit of oil and gas produced and sold. And comprehensively taking values according to the resource type, the price and the national policy. In order to simplify the algorithm, the comprehensive tax in the invention does not consider the income tax and the petroleum special income fund.
The annual production days (Pda) refers to the days of normal production of an oil and gas well every year, and is generally 300 days. The invention provides for taking fixed values.
The produced gas to oil ratio (GOR) is calculated from the crude oil and natural gas production for the initial stable production tested.
The selling prices (Po, Pg) are required to be valued in the economic evaluation regulations when submitted according to the reserve reports.
And the seller rate (SRo, SRg) is comprehensively valued according to the market sales condition of each oil field enterprise.
In this embodiment, step S1 includes the following sub-steps:
s11: according to the index information of the economic ultimate yield of the single well, calculating the partial net income V of each ton of oil yield by adopting the following formulauo：
Vuo＝(Po-TCo)·SRo-Cvo
In the formula, PoA sales price for crude oil; TC (tungsten carbide)oThe crude oil comprehensive tax is obtained; SRoThe commercialization rate of crude oil; cvoVariable cost per unit of oil production;
s12: according to the index information of the economic limit yield of the single well, calculating the net income V of the natural gas yield part per thousand squares by adopting the following formulaug：
Vug＝(Pg-TCg)·SRg-Cvg
In the formula, PgSales price for natural gas; TC (tungsten carbide)gIs a natural gas comprehensive tax; sRgCommercialization rates for natural gas sales; cvgVariable cost per unit of production of natural gas;
s13: calculating the equivalent net income V of each ton of oil gas by using the following formula according to the net income of each ton of oil production part and the net income of each thousand square of natural gas production partuog：
Figure BDA0002980893700000091
In the formula, GOR is the initial stable production gas-oil ratio; wherein if the economic value of gas production is neglected, let Vuog＝Vuo(ii) a If the economic value of the oil production part is neglected, V is ordereduog＝Vug；
S14: calculating the economic limit yield Q of the single well according to the time scale by using the following formula according to the equivalent net income of oil gas per tondog：
Figure BDA0002980893700000092
In the formula, CfxFixing the cost for opening the oil and gas well according to the time scale; vuogNet income per unit oil and gas yield; qdogThe yield is the economic limit.
When the economic ultimate annual output of a single well is calculated, the fixed cost of opening the oil and gas well is recorded as CfaYuan/year; when the economic limit monthly yield of a single well is calculated, the fixed cost of opening the well of the oil-gas well is recorded as CfmYuan/month; when the economic limit daily output of a single well is calculated, the fixed cost of opening the well of the oil and gas well is recorded as CfdYuan/day;
in this embodiment, the dynamic storage capacity calculation standard calculation model in step S2 is an e-model-based dynamic storage capacity calculation standard calculation model, and when the single-well economic ultimate yield is calculated according to the time scale, the step S2 of calculating the initial annual yield of the single-well investment recovery includes the following sub-steps:
s21: solving the following formula according to the acquired index information of the single-well economic ultimate yield and the single-well economic ultimate yield calculated according to the time scale in the step S1, and calculating the total production year n;
Figure BDA0002980893700000101
in the formula, DcaThe annual comprehensive reduction rate is small; dtaThe annual discount rate is small;
s22: according to step S21, the initial annual production from calculation is calculated using the following formula;
Figure BDA0002980893700000102
in the formula, QiyogCalculating the initial annual output for the storage capacity, ton equivalent/year;
s23: according to step S22, the daily production Q is initially calculated using the following formulaiog；
Figure BDA0002980893700000103
Figure BDA0002980893700000104
In the formula, QiogCalculating the lower limit output for the reserves, ton equivalent/day;
s24: converting the equivalent oil-gas yield into the daily oil yield and the daily gas yield according to the ratio of produced gas to oil according to the initial daily gas yield:
Figure BDA0002980893700000105
Figure BDA0002980893700000106
in the formula, QioCalculating the yield of oil per day from the oil storage; qigCalculate the production for the natural gas reserves, square/day.
In this embodiment, when the single-well economic ultimate yield is calculated according to the time scale, the step S2 of calculating the initial monthly yield of the recovered single-well investment includes the following sub-steps:
s20: s201: the annual natural decrement rate is converted into the monthly natural decrement rate, and the annual natural decrement rate is converted into the monthly natural decrement rate by using the following formula because the method is specified as an exponential decrement model;
Figure BDA0002980893700000107
in the formula, DcmMonthly decrement rate, decimal; dcaThe natural annual rate of decline, decimal;
s202: converting the annual discount rate into a monthly discount rate, and converting the annual discount rate Dta into a daily discount rate Dtm by using the following formula;
Figure BDA0002980893700000111
in the formula, DtmThe monthly discount rate is decimal; dtaThe annual discount rate is decimal.
S21: solving the following formula according to the acquired index information of the single-well economic ultimate yield and the single-well economic ultimate yield calculated according to the time scale in the step S1, and calculating the total production month number n;
Figure BDA0002980893700000112
s22: according to step S21, the initial monthly production Q is calculated using the following formulaimog
Figure BDA0002980893700000113
In the formula, QiogCalculating the monthly output for the reserves, ton equivalent per month;
s23: according to step S22, the initial daily output from calculation is calculated using the following formula;
Figure BDA0002980893700000114
Figure BDA0002980893700000115
in the formula, QiogCalculating the lower limit output for the reserves, ton equivalent/day;
s24: converting the oil gas equivalent yield into the oil yield and the gas yield according to the production gas-oil ratio according to the initial daily yield, wherein the oil yield and the gas yield are as follows:
Figure BDA0002980893700000116
Figure BDA0002980893700000117
in the formula, QioCalculating the yield of oil per day from the oil storage; qigCalculate the production for the natural gas reserves, square/day.
In this embodiment, when the single-well economic limit yield is calculated according to the time scale, the calculating of the initial daily yield of the recovered single-well investment in step S2 includes the following sub-steps:
s20: s301: converting the annual comprehensive reduction rate into a daily reduction rate, and converting the annual natural reduction rate into the daily comprehensive reduction rate by using the following formula because the invention is specified as an exponential reduction model;
Figure BDA0002980893700000118
in the formula, DcdThe daily natural rate of decline, decimal; dcaThe natural annual rate of decline, decimal; pdaDays of annual production;
s302: converting the annual discount rate into a daily discount rate, and converting the annual discount rate Dta into a daily discount rate Dtd by using the following formula;
Figure BDA0002980893700000121
in the formula, DtdThe daily discount rate is decimal; dtaThe annual discount rate is decimal.
S21: solving the following formula according to the acquired index information of the single-well economic ultimate yield and the single-well economic ultimate yield calculated according to the time scale in the step S1, and calculating the total production days n;
Figure BDA0002980893700000122
s22: according to step S21, the daily lower limit Q of initial starting production is calculated by the following formulaiog；
Figure BDA0002980893700000123
In the formula, QiogCalculating the lower limit output for the reserves, ton equivalent/day;
s23: according to step S22, the oil gas equivalent production is converted into oil production and gas production according to the produced gas-oil ratio as follows:
Figure BDA0002980893700000124
Figure BDA0002980893700000125
in the formula, QioThe yield is calculated for the oil reserves,ton/day; qigCalculate the production for the natural gas reserves, square/day.
Therefore, the invention belongs to the technical field of oil and gas exploration and development, in particular to a simplification method of reserve calculation standard in oil and gas geological reserve estimation specification (DZ/T0217-2020); in the embodiment, a dynamic storage capacity calculation standard calculation model based on an e model is adopted to calculate and recover the initial yield of the single well investment, namely the storage capacity calculation standard.
The model can estimate the in-situ fluid in the initial state and the current state, and the estimation result is greatly influenced by the oil reservoir dynamic development scheme and is related to development dynamic parameters such as the liquid supply capacity, the production dynamic state, the exploitation mechanism and the like of an oil well. The dynamic reserve of an oil and gas reservoir refers to the total amount of oil and gas that can flow out of the gas reservoir when the production is put into production in the developed geological reserve until the formation pressure in the natural gas yield and spread range is reduced to zero under the condition that the prior art and the prior well pattern mining mode are not changed. The dynamic method is usually a method for calculating reserves by using the production dynamic materials with time-varying air pressure, yield, cumulative yield and the like, such as a material balance method (often called a pressure drop method), an elastic two-phase method (also often called a gas reservoir edge-exploring test method), a yield delivery method, a mathematical model method and the like. The dynamic reserves can be accurately determined by screening a dynamic calculation method adapted to the dynamic data developed by the gas reservoir, and the key of the analysis of the dynamic method is to carry out history fitting on the productivity and development parameters of a single well and continuously adjust the model until the model is close to a reasonable range.
The invention has the main characteristics that: (1) the characteristic of natural decrement of the oil and gas well is fully considered, exponential decrement is used as a constraint model, and the economic limit initial yield (storage capacity calculation standard) is obtained by backward deduction according to the economic limit annual yield. (2) The economic value of two products of crude oil and natural gas is fully considered.
Example 2
As shown in fig. 1, the present embodiment is different from embodiment 1 in that the dynamic storage capacity calculation standard calculation model in step S2 adopts an n-model-based dynamic storage capacity calculation standard calculation model, and when the single-well economic ultimate yield is calculated according to the time scale as the single-well economic ultimate annual yield, the step S2 of calculating the initial annual yield of the single-well investment withdrawal includes the following sub-steps:
s21: solving the following formula according to the acquired index information of the single-well economic ultimate yield and the single-well economic ultimate yield calculated according to the time scale in the step S1, and calculating the total production year n;
Figure BDA0002980893700000131
in the formula, DcaThe annual comprehensive reduction rate is small;
s22: according to step S21, the initial annual production from calculation is calculated using the following formula;
Qiyog＝Qdog·(1+Dca)n-1
in the formula, QiyogCalculating the initial annual output for the storage capacity, ton equivalent/year;
s23: according to step S22, the daily production Q is initially calculated using the following formulaiog；
Figure BDA0002980893700000132
Figure BDA0002980893700000133
In the formula, QiogCalculating the lower limit output for the reserves, ton equivalent/day;
s24: converting the equivalent oil-gas yield into the daily oil yield and the daily gas yield according to the ratio of produced gas to oil according to the initial daily gas yield:
Figure BDA0002980893700000134
Figure BDA0002980893700000135
in the formula, QioCalculating the yield of oil per day from the oil storage; qigCalculate the production for the natural gas reserves, square/day.
In this embodiment, when the single-well economic ultimate yield is calculated according to the time scale, the step S2 of calculating the initial monthly yield of the recovered single-well investment includes the following sub-steps:
s20 includes:
s201: the annual natural decrement rate is converted into the monthly natural decrement rate, and the annual natural decrement rate is converted into the monthly natural decrement rate by using the following formula because the method is specified as an exponential decrement model;
Figure BDA0002980893700000141
in the formula, DcmMonthly decrement rate, decimal; dcaThe natural annual rate of decline, decimal;
s202: converting the annual discount rate into a monthly discount rate, and converting the annual discount rate Dta into a daily discount rate Dtm by using the following formula;
Figure BDA0002980893700000142
in the formula, DtmThe monthly discount rate is decimal; dtaThe annual discount rate is decimal.
S21: solving the following formula according to the acquired index information of the single-well economic ultimate yield and the single-well economic ultimate yield calculated according to the time scale in the step S1, and calculating the total production month number n;
Figure BDA0002980893700000143
s22: according to step S21, the initial monthly production Q is calculated using the following formulaimog
Qimog＝Qdog·(1+Dcm)n-1
In the formula, QiogCalculating the monthly output for the reserves, ton equivalent per month;
s23: according to step S22, the initial daily output from calculation is calculated using the following formula;
Figure BDA0002980893700000144
Figure BDA0002980893700000145
in the formula, QiogCalculating the lower limit output for the reserves, ton equivalent/day;
s24: converting the oil gas equivalent yield into the oil yield and the gas yield according to the production gas-oil ratio according to the initial daily yield, wherein the oil yield and the gas yield are as follows:
Figure BDA0002980893700000146
Figure BDA0002980893700000147
in the formula, QioCalculating the yield of oil per day from the oil storage; qigCalculate the production for the natural gas reserves, square/day.
In this embodiment, when the single-well economic limit yield is calculated according to the time scale, the calculating of the initial daily yield of the recovered single-well investment in step S2 includes the following sub-steps:
s20 includes:
s301: the annual comprehensive reduction rate is converted into a daily reduction rate, and the annual natural reduction rate is converted into the daily comprehensive reduction rate by using the following formula because the invention is specified as an exponential reduction model;
Figure BDA0002980893700000151
in the formula, DcdThe daily natural rate of decline, decimal; dcaThe natural annual rate of decline, decimal; pdaDays of annual production;
s302: converting the annual discount rate into a daily discount rate, and converting the annual discount rate Dta into a daily discount rate Dtd by using the following formula;
Figure BDA0002980893700000152
in the formula, DtdThe daily discount rate is decimal; dtaThe annual discount rate is decimal.
S21: solving the following formula according to the acquired index information of the single-well economic ultimate yield and the single-well economic ultimate yield calculated according to the time scale in the step S1, and calculating the total production days n;
Figure BDA0002980893700000153
s22: according to step S21, the daily lower limit Q of the initial starting production is calculated by the following formulaiog；
Qiog＝Qdog·(1+Dcd)n-1
In the formula, QiogCalculating the lower limit output for the reserves, ton equivalent/day;
s23: according to step S22, the oil gas equivalent production is converted into oil production and gas production according to the produced gas-oil ratio as follows:
Figure BDA0002980893700000154
Figure BDA0002980893700000155
in the formula, QioCalculating the yield of oil per day from the oil storage; qigCalculate the production for the natural gas reserves, square/day.
In the embodiment, the dynamic storage capacity calculation standard calculation model based on the n model is adopted to calculate and recover the initial yield of the single well investment, namely the storage capacity calculation standard.
Wherein: the main difference between the n-model and the e-model is in the decreasing rate conversion method, where the n-model is the product method and the e-model is the integral method.
Specifically, the method comprises the following steps: the N model is a conversion method between different units of the oil and gas well index decrement rate based on a product method.
By definition of the rate of decrease, the exponential rate of decrease can be written as follows:
Figure BDA0002980893700000156
the above equation may be used for any time interval. If the yield is Qi when time t is 0 (i.e., the time at which the decrement is started) and Q by time t, the yield expression is:
Q＝Qi·(1-D)t
based on this principle, the existing conversion formula is generally:
Figure BDA0002980893700000161
specifically, the method comprises the following steps: the e model is a conversion method between different units of the oil and gas well index decrement rate based on an integral method.
By definition of the rate of decrease, the exponential rate of decrease can be written as follows:
Figure BDA0002980893700000162
the above equation can be used for any small time interval. If the yield is Qi when time t is 0 (i.e., the time at which the decrement is started) and the yield is Q by time t, the yield expression can be found by the following integral:
Figure BDA0002980893700000163
the rate of decrease D does not vary with time and is integrated by the above equation:
Q＝Qi·e-D·t
the existing conversion formula is generally:
Figure BDA0002980893700000164
the invention has the main characteristics that: (1) the characteristic of natural decrement of the oil and gas well is fully considered, exponential decrement is used as a constraint model, and the economic limit initial yield (storage capacity calculation standard) is obtained by backward deduction according to the economic limit annual yield. (2) The economic value of two products of crude oil and natural gas is fully considered.
Example 3
As shown in fig. 2, this embodiment is different from embodiment 1 in that this embodiment provides a device for obtaining hydrocarbon well reserves calculation criteria based on dynamic analysis, which supports a method for obtaining hydrocarbon well reserves calculation criteria based on dynamic analysis described in embodiment 1 or embodiment 2, and the device includes:
the input unit is used for inputting the acquired index information of the economic limit yield of the single well;
the first calculation unit is used for calculating the single-well economic limit yield according to the time scale according to the input index information of the single-well economic limit yield; the single-well economic ultimate yield comprises single-well economic ultimate annual yield, single-well economic ultimate monthly yield and single-well economic ultimate daily yield;
the second calculation unit is used for calculating the initial yield of the single well investment to be recovered according to a dynamic storage capacity calculation standard calculation model based on the single well economic limit yield, wherein the initial yield of the single well investment to be recovered is a storage capacity calculation standard; the recovering of the initial single-well investment yield comprises recovering the initial annual single-well investment yield, recovering the initial monthly single-well investment yield and recovering the initial daily single-well investment yield;
and the output unit is used for outputting the initial yield of the recovered single well investment.
The method for obtaining the calculation standard of the oil and gas well storage capacity based on the dynamic analysis is carried out according to the method steps in the embodiment 1 or the embodiment 2. And will not be described in detail herein.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application 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 application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (10)

1. A method for obtaining calculation-starting standard of oil and gas well storage capacity based on dynamic analysis is characterized by comprising the following steps:
s1: acquiring index information of the single-well economic ultimate yield as input, and calculating the single-well economic ultimate yield according to the time scale according to the input index information of the single-well economic ultimate yield;
s2: and calculating and recovering the initial yield of the single well investment according to a dynamic storage capacity starting calculation standard calculation model based on the single well economic ultimate yield, wherein the recovered initial yield of the single well investment, namely the storage capacity starting calculation standard, is output.
2. The method for obtaining the calculation standard of the oil and gas well storage capacity based on the dynamic analysis as claimed in claim 1, wherein the index information of the economic ultimate yield of the single well comprises the selling price of crude oil, the comprehensive tax of crude oil, the commercialization rate of crude oil, the variable cost of the yield per oil unit, the selling price of natural gas, the comprehensive tax of natural gas, the commercialization rate of natural gas selling, the variable cost of the yield per natural gas unit, the gas-oil ratio of production, the annual comprehensive decrement rate and the fixed annual cost of the single well.
3. The method for obtaining the calculation-from-storage standard of the oil and gas well based on the dynamic analysis as claimed in claim 1, wherein the calculation of the economic ultimate yield of the single well according to the time scale comprises the economic ultimate annual yield of the single well, the economic ultimate monthly yield of the single well and the economic ultimate daily yield of the single well; step S1 includes the following substeps:
s11: according to the index information of the economic ultimate yield of the single well, calculating the partial net income V of each ton of oil yield by adopting the following formulauo：
Vuo＝(Po-TCo)·SRo-Cvo
In the formula, PoA sales price for crude oil; TC (tungsten carbide)oThe crude oil comprehensive tax is obtained; SRoThe commercialization rate of crude oil; cvoVariable cost per unit of oil production;
s12: according to the index information of the economic limit yield of the single well, calculating the net income V of the natural gas yield part per thousand squares by adopting the following formulaug：
Vug＝(Pg-TCg)·SRg-Cvg
In the formula, PgSales price for natural gas; TC (tungsten carbide)gIs a natural gas comprehensive tax; SRgCommercialization rates for natural gas sales; cvgVariable cost per unit of production of natural gas;
s13: calculating the equivalent net income V of each ton of oil gas by using the following formula according to the net income of each ton of oil production part and the net income of each thousand square of natural gas production partuog：
Figure FDA0002980893690000011
In the formula, GOR is the initial stable production gas-oil ratio; wherein if the economic value of gas production is neglected, let Vuog＝Vuo(ii) a If the economic value of the oil production part is neglected, V is ordereduog＝Vug
S14: calculating the economic limit yield Q of the single well according to the time scale by using the following formula according to the equivalent net income of oil gas per tondog：
Figure FDA0002980893690000021
In the formula, CfxFixing the cost for opening the oil and gas well according to the time scale; vuogNet income per unit oil and gas yield; qdogThe yield is the economic limit.
4. The method for obtaining hydrocarbon well storage capacity calculation standard based on dynamic analysis as claimed in claim 3, wherein the dynamic storage capacity calculation standard calculation model in step S2 adopts an e-model-based dynamic storage capacity calculation standard calculation model, and the step S2 of calculating the initial annual production of single well investment when the economic ultimate production of single well is calculated according to the time scale comprises the following sub-steps:
s21: solving the following formula according to the acquired index information of the single-well economic ultimate yield and the single-well economic ultimate yield calculated according to the time scale in the step S1, and calculating the total production year n;
Figure FDA0002980893690000022
in the formula, DcaThe annual comprehensive rate of decline; dtaThe annual discount rate;
s22: according to step S21, the initial annual production from calculation is calculated using the following formula;
Figure FDA0002980893690000023
in the formula, QiyogCalculating the initial annual output for the reserves;
s23: according to step S22, the daily production Q is initially calculated using the following formulaiog；
Figure FDA0002980893690000024
Figure FDA0002980893690000025
In the formula, QiogCalculating the lower limit yield for the reserves;
s24: converting the equivalent oil-gas yield into the daily oil yield and the daily gas yield according to the ratio of produced gas to oil according to the initial daily gas yield:
Figure FDA0002980893690000026
Figure FDA0002980893690000027
in the formula, QioCalculating the yield for the oil reserves; qigThe production is calculated for the reserves of natural gas.
5. The method for obtaining the calculation-proof standard of oil and gas well reserves based on dynamic analysis as claimed in claim 4, wherein when the economic ultimate production of single well according to time scale is the economic ultimate monthly production of single well, the step S2 of calculating the initial monthly production of single well investment before the step S21 of recovering the initial monthly production of single well investment further comprises S20, and the step S20 comprises:
s201: converting the annual natural decrement rate into a monthly natural decrement rate, and converting the annual natural decrement rate into a monthly natural decrement rate by using the following formula;
Figure FDA0002980893690000031
in the formula, DcmThe monthly decrement rate; dcaThe natural annual rate of decline;
s202: converting the annual discount rate into a monthly discount rate, and converting the annual discount rate Dta into a daily discount rate Dtm by using the following formula;
Figure FDA0002980893690000032
in the formula, DtmThe monthly withdrawal rate; dtaIs the annual discount rate.
6. The method for obtaining the calculation-from-storage-volume criteria of oil and gas wells based on dynamic analysis of claim 4, wherein when the economic ultimate yield of single well is calculated according to the time scale as the economic ultimate daily yield of single well, the step S2 of calculating the initial daily yield of single well investment is preceded by the step S21 of S30, and the step S30 of:
s301: converting the annual comprehensive reduction rate into a daily reduction rate, and converting the annual natural reduction rate into the daily comprehensive reduction rate by using the following formula;
Figure FDA0002980893690000033
in the formula, DcdThe daily natural rate of decline; dcaThe natural annual rate of decline; pdaDays of annual production;
s302: converting the annual discount rate into a daily discount rate, and converting the annual discount rate Dta into a daily discount rate Dtd by using the following formula;
Figure FDA0002980893690000034
in the formula, DtdThe daily discount rate; dtaIs the annual discount rate.
7. The method for obtaining hydrocarbon well storage capacity calculation standard based on dynamic analysis as claimed in claim 3, wherein the dynamic storage capacity calculation standard calculation model in step S2 adopts an n-model-based dynamic storage capacity calculation standard calculation model, and the step S2 of calculating the initial annual production of single well investment when the economic ultimate production of single well is calculated according to the time scale comprises the following sub-steps:
s21: solving the following formula according to the acquired index information of the single-well economic ultimate yield and the single-well economic ultimate yield calculated according to the time scale in the step S1, and calculating the total production year n;
Figure FDA0002980893690000035
in the formula, DcaThe annual comprehensive rate of decline;
s22: according to step S21, the initial annual production from calculation is calculated using the following formula;
Qiyog＝Qdog·(1+DCa)n-1
in the formula, QiyogCalculating the initial annual output for the reserves;
s23: according to step S22, the daily production Q is initially calculated using the following formulaiog；
Figure FDA0002980893690000041
Figure FDA0002980893690000042
In the formula, QiogCalculating the lower limit yield for the reserves;
s24: converting the equivalent oil-gas yield into the daily oil yield and the daily gas yield according to the ratio of produced gas to oil according to the initial daily gas yield:
Figure FDA0002980893690000043
Figure FDA0002980893690000044
in the formula, QioCalculating the yield for the oil reserves; qigThe production is calculated for the reserves of natural gas.
8. The method for obtaining starting calculation criteria of oil and gas well reserves based on dynamic analysis of claim 7, wherein when the economic limit production of single well according to time scale is economic limit monthly production of single well, the step S2 of calculating the initial monthly production of single well investment for withdrawing step S21 further comprises S20, and the step S20 comprises:
s201: converting the annual natural decrement rate into a monthly natural decrement rate, and converting the annual natural decrement rate into a monthly natural decrement rate by using the following formula;
Figure FDA0002980893690000045
in the formula, DcmThe monthly decrement rate; dcaThe natural annual rate of decline;
s202: converting the annual discount rate into a monthly discount rate, and converting the annual discount rate Dta into a daily discount rate Dtm by using the following formula;
Figure FDA0002980893690000046
in the formula, DtmThe monthly withdrawal rate; dtaIs the annual discount rate.
9. The method for obtaining the calculation-from-storage-volume criteria of oil and gas wells based on dynamic analysis of claim 7, wherein when the economic ultimate production of single well according to the time scale is the economic ultimate daily production of single well, the step S2 of calculating the initial daily production of single well investment before the step S21 of recovering the initial daily production of single well investment further comprises S30, and the step S30 comprises:
s301: converting the annual comprehensive reduction rate into a daily reduction rate, and converting the annual natural reduction rate into the daily comprehensive reduction rate by using the following formula;
Figure FDA0002980893690000051
in the formula, DcdThe daily natural rate of decline; dcaThe natural annual rate of decline; pdaDays of annual production;
s302: converting the annual discount rate into a daily discount rate, and converting the annual discount rate Dta into a daily discount rate Dtd by using the following formula;
Figure FDA0002980893690000052
in the formula, DtdThe daily discount rate; dtaIs the annual discount rate.
10. An apparatus for obtaining hydrocarbon well reserves calculation standard based on dynamic analysis, which supports a method for obtaining hydrocarbon well reserves calculation standard based on dynamic analysis according to any one of claims 1 to 9, the apparatus comprising:
the input unit is used for inputting the acquired index information of the economic limit yield of the single well;
the first calculation unit is used for calculating the single-well economic limit yield according to the time scale according to the input index information of the single-well economic limit yield; the single-well economic ultimate yield comprises single-well economic ultimate annual yield, single-well economic ultimate monthly yield and single-well economic ultimate daily yield;
the second calculation unit is used for calculating the initial yield of the single well investment to be recovered according to a dynamic storage capacity calculation standard calculation model based on the single well economic limit yield, wherein the initial yield of the single well investment to be recovered is a storage capacity calculation standard; the recovering of the initial single-well investment yield comprises recovering the initial annual single-well investment yield, recovering the initial monthly single-well investment yield and recovering the initial daily single-well investment yield;
and the output unit is used for outputting the initial yield of the recovered single well investment.
CN202110287029.2A 2021-03-17 2021-03-17 Method and device for obtaining calculation standard of oil and gas well storage capacity based on dynamic analysis Pending CN113011736A (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114970153A (en) * 2022-05-25 2022-08-30 重庆科技学院 Oil and gas reservoir type underground gas storage multi-period injection-production dynamic storage capacity calculation method

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114970153A (en) * 2022-05-25 2022-08-30 重庆科技学院 Oil and gas reservoir type underground gas storage multi-period injection-production dynamic storage capacity calculation method
CN114970153B (en) * 2022-05-25 2023-07-25 重庆科技学院 Multi-period injection-production dynamic reservoir capacity calculation method for oil-gas reservoir type underground gas reservoir

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