CN111861064B - Method and system for determining economic recoverable reserves of crude oil by adopting stable daily output - Google Patents
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Abstract
The invention provides a method and a system for determining economic recoverable reserves of crude oil by adopting stable daily output, wherein the method comprises the following steps: extracting petroleum in a target reservoir; based on the produced oil, the initial stable daily output q of the stable production period before the linear decreasing production of the oil well is measured and determined 0 And steady daily output q in straight line decreasing period t And decreasing the production days m per month on average, and determining the accumulated crude oil yield N before decreasing the production of the oil well o The method comprises the steps of carrying out a first treatment on the surface of the Further, the initial daily reduction rate D is determined through calculation di And determining an arithmetic difference q of the steady daily output data in the linear decrementing period 0 D di Determining the decreasing production life L of the oil well by combining the economic limit and the daily output; further determining economic recoverable reserves N of crude oil in linear decreasing period E Further determining economic recoverable reserves N of crude oil of oil well RE . The method can objectively and accurately calculate the economic recoverable reserves of the crude oil in the linear decreasing period corresponding to the economic limit stable daily output of the oil well.
Description
Technical Field
The invention relates to the field of oil field exploration and development, in particular to a method and a system for determining the economic recoverable reserves of crude oil of a linear decreasing oil well by using stable daily yield, which belong to the crude oil recoverable reserve evaluation technology and are suitable for crude oil economic recoverable reserve calculation. More particularly, the invention relates to the fields of oil well crude oil economic evaluation, crude oil resource/reserve evaluation and the like.
Background
As early as 1945, three well production decline types were given by Arps: the application range of the decreasing index is defined as 0.ltoreq.n.ltoreq.1, such as the economic recoverable reserves calculation in SY/T5367-2010 (published by oil industry Press) only refers to the calculation methods under the conditions of decreasing index, decreasing hyperbolic and decreasing reconciliation. In practical application, the method and application of oilfield yield progressive rate (second edition) (Zhang Zongda, 2015 publication by Petroleum industry Press), "establishment, comparison and application of linear progressive type" (Chen Yuanqian, zhou Cui, volume 36, 8 of Petroleum journal), 2015), "establishment and application of generalized decreasing model" (Chen Yuanqian, tang Wei, volume 37, 11 th, 2016) the application range of decreasing index (n) in hyperbolic decreasing model is extended to (-10, 10) or (- -infinity, + -infinity), and is called "generalized Arps decreasing model":
d in di -initial daily rate of decline, f;
n-decreasing index;
N t cumulative yield of crude oil during the run-down period (no q 0 And previous yield), m 3 ；
q 0 -initial stable daily yield (stable daily yield before decreasing production of oil well), m 3 /d；
q t Stable daily production, m, on day t of decreasing production of oil well 3 /d；
t is the decreasing production days of the oil well (t is more than or equal to 1), and d.
When the decreasing exponent n= -1, the generalized Arps decreasing model is deformed from the steady daily yield equation (1) in the straight decreasing period to the steady daily yield equation in the straight decreasing type:
q t ＝q 0 (1-tD di ) (3)
when the decreasing index n= -1, the economic limit is stabilized with daily yield q e Stable daily yield q in corresponding equation (3) t Stabilization of daily yield q from economic limits e When the oil well decreasing production days t are replaced by the oil well decreasing production life 12mL, the decreasing period crude oil accumulated yield formula (2) of the generalized Arps decreasing model is combined with the formula (3) to be deformed into a decreasing period crude oil economy recoverable reserve calculation formula:
N′ E ＝1.2×10 -3 mLq 0 (1-6mLD di ) (4)
wherein L is the decreasing production life of the oil well, a;
m-average decreasing production days per month (m is less than or equal to 31) and d;
N′ E -Arps Linear decrease period crude oil economic recoverable reserves, 10 4 m 3 。
Through analysis and comparison of the steady daily output arithmetic difference data of the ideal linear decreasing period, the steady daily output error of the oil well in the linear decreasing period is calculated to be 0 by adopting the formula (3), and the economic recoverable reserve of crude oil in the linear decreasing period is calculated to have obvious deviation by adopting the formula (4).
Disclosure of Invention
The invention aims to provide a new method and a system for determining the economic recoverable reserves of the linearly decreasing oil well, which are used for objectively and accurately evaluating the crude oil resources/recoverable reserves potential of the oil well or an evaluation unit, and aims to objectively evaluate the resource potential of the linearly decreasing oil well at the economic limit time point, eliminate the obvious deviation existing when the generalized Arps decreasing model calculates the economic recoverable reserves of the crude oil in the linearly decreasing period.
In order to achieve the purpose, the invention firstly measures the accumulated yield, the initial stable daily yield and the stable daily yield of the oil well in the decreasing period before decreasing production, and further calculates and obtains the economic recoverable reserves of the crude oil in the decreasing period and the economic recoverable reserves of the crude oil in the oil well corresponding to the economic limit time points, thereby providing an evaluation method and an evaluation system for determining the economic recoverable reserves of the crude oil in the decreasing period by using the stable daily yield.
According to a specific embodiment of the present invention, there is provided a method of determining the economic recoverable reserves of crude oil during a straight run-down period, the method comprising the steps of:
extracting petroleum in a target reservoir;
based on the produced oil, measuring and determining initial stable daily yield and stable daily yield of the oil well in a stable production period before the linear decreasing production period and average decreasing production days per month, and determining accumulated crude oil yield before the oil well decreasing production period;
and determining the economic recoverable oil well crude oil based on the initial stable daily yield of the stable production period before the linear decreasing production of the oil well, the stable daily yield of the linear decreasing production period, the average decreasing production days per month and the accumulated crude oil yield before the decreasing production of the oil well, and combining the economic limit stable daily yield.
According to a specific embodiment of the present invention, in the method for determining economic recoverable reserves of crude oil in a straight line decreasing period of the present invention, the process for determining the economic recoverable reserves of crude oil in an oil well based on the initial stable daily yield in the stable production period before the straight line decreasing production of the oil well, the stable daily yield in the straight line decreasing period, the average decreasing production days per month, the accumulated yield of crude oil before the decreasing production of the oil well, and the economic ultimate stable daily yield comprises:
determining an initial daily reduction rate based on the initial daily steady yield of the well at the steady production period before the linear reduction production and the daily steady yield of the well on the 1 st day of the reduction production;
determining the decreasing production life of the oil well based on the initial stable daily yield of the oil well in the steady production period before the linear decreasing production, the decreasing production days of each month on average and the initial daily decreasing rate and the economic limit stable daily yield;
determining the economic recoverable reserves of crude oil in the linear decreasing period based on the initial stable daily yield of the stable production period before the linear decreasing production of the oil well, the average decreasing production days of each month, the initial daily decreasing rate and the decreasing production life of the oil well; or determining the economic recoverable reserves of the crude oil in the linear decreasing period based on the stable daily yield of the oil well decreasing production on the 1 st day, the average decreasing production days per month, the initial daily decreasing rate and the decreasing production life of the oil well;
and determining the economic recoverable reserves of the crude oil of the oil well based on the accumulated crude oil yield before the decreasing production of the oil well and the economic recoverable reserves of the crude oil in the linear decreasing period.
According to a specific embodiment of the present invention, in the method for determining economic recoverable reserves of crude oil in a straight line decreasing period of the present invention, the initial daily decreasing rate D is determined based on the initial daily steady-state production in the steady production period before straight line decreasing production of the oil well and the daily steady-state production in the 1 st day of decreasing production of the oil well di The following formula is satisfied:
q in 1 Stable daily production, m, on day 1 of decreasing production in oil well 3 /d。
According to the specific embodiment of the invention, in the method for determining the economic recoverable reserves of the crude oil in the linear decreasing period, when the decreasing production life of the oil well is determined based on the initial stable daily yield of the stable production period before the linear decreasing production of the oil well, the average decreasing production days per month, the initial daily decreasing rate and the economic limit stable daily yield, the decreasing production life L accords with the following formula:
q in e Economic limit stable daily yield, m 3 /d。
According to an embodiment of the present invention, in the method of determining economic recoverable reserves of crude oil in a straight line decreasing period of the present inventionWhen determining the crude oil economy recoverable reserves in the linear decreasing period based on the initial stable daily yield in the stable production period before the linear decreasing production of the oil well, the average decreasing production days per month, the initial daily decreasing rate and the oil well decreasing production life E The following formula is satisfied:
N E ＝6×10 -4 mLq 0 [2-D di (12mL+1)] (7)
in N E Crude oil economical recoverable reserves in straight line decreasingly period, 10 4 m 3 ；
Alternatively, when determining the linearly decreasing crude oil economic recoverable reserves based on the steady daily production of the 1 st day of decreasing production of the oil well, the average decreasing production day per month, the initial daily rate, the decreasing production life of the oil well, the linearly decreasing crude oil economic recoverable reserves N E The following formula is satisfied:
in N E Crude oil economical recoverable reserves in straight line decreasingly period, 10 4 m 3 。
In some embodiments of the invention, the method of determining the economic recoverable reserves of a straight run-down crude oil of the invention comprises:
1) Extracting petroleum in a target reservoir;
2) Measuring and obtaining oil production data of an oil well and stable daily output data of a wellhead based on the produced oil;
wherein the well oil production data comprises an initial stable daily production q before the well decrements 0 Decreasing the cumulative yield N before production o ；
The wellhead stable daily output data refers to the stable daily output q in the decreasing period t Decreasing production days m per month in average in decreasing period;
3) Calculating to obtain initial daily reduction rate D di The initial daily reduction rate D di The following formula is satisfied:
q in 1 Stable daily production, m, on day 1 of decreasing production in oil well 3 /d；
Determining the difference of the stable daily output data in the decrementing period as q 0 D di ；
4) Calculating the decreasing production life L of the oil well; wherein the decreasing production life L of the well corresponds to the following formula:
q in e Economic limit stable daily yield, m 3 /d。
5) Obtaining economic recoverable reserves N of crude oil in linear decreasing period E ；N E The following formula is satisfied:
N E ＝6×10 -4 mLq 0 [2-D di (12mL+1)] (7)
or (b)
In N E Crude oil economical recoverable reserves in straight line decreasingly period, 10 4 m 3 ；
6) Calculating the economic recoverable reserves of the crude oil of the oil well;
N RE ＝N o +N E (9)
in N o Crude oil accumulation yield before oil well decreasing production 10 4 m 3 ；
N RE Economic recoverable oil well crude oil reserve 10 4 m 3 。
According to the specific embodiment of the invention, the petroleum in the target oil reservoir can be produced by adopting conventional oil field development equipment and corresponding production modes.
According to a specific embodiment of the invention, oil well production data and wellhead stability daily production data are obtained by corresponding storage and transportation equipment based on the produced oil.
According to a specific embodiment of the invention, the steady daily output of the oil well in the linear decreasing period is an arithmetic series, and the difference between any two adjacent steady daily output is a constant q 0 D di 。
According to a specific embodiment of the invention, the cumulative yield N of crude oil prior to decreasing production in an oil well o Is equal to the sum of the oil production of various test activities and the oil production of stable production period.
In another aspect, the present invention also provides a system for determining economic recoverable reserves of crude oil in a linear decrement phase, the system is a method for determining economic recoverable reserves of crude oil in a linear decrement phase according to the present invention, the system comprises:
a data acquisition unit for acquiring initial steady daily yield in steady production period before oil well linear decrease production, steady daily yield in linear decrease period, average decrease production days per month and accumulated crude oil yield before oil well decrease production based on the extracted oil;
the data analysis processing unit is used for determining the economic recoverable oil well crude oil based on the initial stable daily yield of the stable production period before the oil well linearly decreases production, the stable daily yield of the linear decrease period, the average decreasing production days per month and the accumulated crude oil yield before the oil well decreases production and combining the economic limit stable daily yield.
According to particular embodiments of the invention, the system may further include a petroleum extraction unit for extracting petroleum in the target reservoir.
In the system for determining economic recoverable reserves of crude oil in a straight-line decrementing period according to the present invention, the data analysis processing unit may comprise:
the oil well decreasing production life determining module is used for determining the decreasing production life of the oil well based on the initial stable daily yield of the oil well in the steady production period before the linear decreasing production, the average decreasing production days of each month and the initial daily decreasing rate and combining the economic limit stable daily yield;
the linear decreasing period crude oil economy recoverable reserves determining module is used for determining the linear decreasing period crude oil economy recoverable reserves based on the initial stable daily output of the stable production period before the linear decreasing production of the oil well, the average decreasing production days of each month, the initial daily decreasing rate and the decreasing production life of the oil well; or determining the economic recoverable reserves of the crude oil in the linear decreasing period based on the stable daily yield of the oil well decreasing production on day 1, the average decreasing production day per month, the initial daily decreasing rate and the decreasing production life of the oil well;
and the oil well crude oil economy recoverable reserves determining module is used for determining the oil well crude oil economy recoverable reserves based on the accumulated crude oil yield before the oil well is subjected to the decreasing production and the crude oil economy recoverable reserves in the linear decreasing period.
In the system for determining economic recoverable reserves of crude oil in a straight-line decrementing period according to the present invention, the data analysis processing unit may further comprise:
the initial daily reduction rate determining module is used for determining the initial daily reduction rate based on the initial stable daily yield of the stable production period before the oil well linearly reduces production and the stable daily yield of the 1 st day of the oil well reduces production.
According to a further embodiment of the present invention, in the system for determining economic recoverable reserves of crude oil in a straight-line decreasing period of the present invention, the initial daily decreasing rate determining module may calculate the initial daily decreasing rate D according to the following model formula di ：
Q in 1 Stable daily production, m, on day 1 of decreasing production in oil well 3 /d；
Determining the difference of the stable daily output data in the decrementing period as q 0 D di ；
According to a further embodiment of the present invention, in the system for determining economic recoverable reserves of crude oil in a straight-line decreasing period of the present invention, the decreasing production life determining module may calculate the decreasing production life L of the oil well according to the following model formula:
q in e Economic limit stable daily yield, m 3 /d。
According to a further embodiment of the present invention, in the system for determining a linear decrease period of crude oil economic recoverable reserves of the present invention, the linear decrease period of crude oil economic recoverable reserves determination module may calculate and obtain a linear decrease period of crude oil economic recoverable reserves N according to the following model formula E ：
N E ＝6×10 -4 mLq 0 [2-D di (12mL+1)] (7)
Or (b)
In N E Crude oil economical recoverable reserves in straight line decreasingly period, 10 4 m 3 ；
According to a further embodiment of the present invention, in the system for determining economic recoverable reserves of crude oil in a straight line decreasing period of the present invention, the oil well crude oil economic recoverable reserves determining module may calculate the oil well crude oil economic recoverable reserves according to the following model formula:
N RE ＝N o +N E (9)
in N o Crude oil accumulation yield before oil well decreasing production 10 4 m 3 ；
N RE Economic recoverable oil well crude oil reserve 10 4 m 3 。
In the system for determining economic recoverable reserves of crude oil in the linear decreasing period, the data acquisition unit can be measuring equipment for measuring the recovered petroleum to obtain initial stable daily yield in the stable production period before the linear decreasing production of the oil well, stable daily yield in the linear decreasing period, average decreasing production days per month and accumulated crude oil yield before the decreasing production of the oil well. The data analysis processing unit may be a computer device for analyzing data and processing data, or may be a virtual device (e.g. by manual calculation).
The invention has the beneficial effects that:
any oil well enters a production stage with decreasing yield along with the passage of production time, when the change of the yield in the decreasing stage belongs to a linear decreasing type, based on the rule of decreasing the yield of the oil well, the invention establishes a method for measuring and calculating the recoverable reserves of the crude oil economy in the linear decreasing stage of the oil well, which is corresponding to the economic limit and the daily yield of the oil well, can objectively and accurately calculate the recoverable reserves of the crude oil economy in the linear decreasing stage, and the calculated error of the derived linear decreasing stage crude oil economy recoverable reserves formula is 0, thereby eliminating the error existing when the 'generalized Arps decreasing model' is used for calculating the recoverable reserves of the crude oil economy in the decreasing stage of the oil well, and providing a convenient, accurate and effective evaluation method for evaluating the recoverable reserves of the crude oil economy and the crude oil resource/reserves of the linear decreasing production oil well.
Detailed Description
The following detailed description of the invention and the advantages achieved by the embodiments are intended to help the reader to better understand the nature and features of the invention, and are not intended to limit the scope of the invention. In the examples, experimental methods for which specific conditions are not noted are conventional methods and conventional conditions well known in the art.
Example 1
In this embodiment, taking an H3 well as an example, a method for determining the economic recoverable reserves of crude oil in a straight run-down phase of an oil well is provided. The method comprises the following steps:
1) Adopting oil field development equipment and corresponding production modes to extract petroleum in a target oil reservoir;
2) Based on the produced oil, measuring and obtaining oil production data of the oil well and stable daily output data of the wellhead through corresponding storage and transportation equipment;
wherein the oil well oil production data comprises initial stable daily output q of the stable production period before the oil well is progressively produced 0 Stable daily output q in straight line decreasing period t Decreasing production days m per month in average in decreasing period; accumulated crude oil yield N before decreasing production of oil well o ；
Wherein q t Production of stable daily production for oil well by decreasing production day t, m 3 /d; t is the decreasing production days of the oil well, d;
the accumulated crude oil yield before H3 well linear decreasing production is 380m 3 Average production per month is reduced for 25 days, and economic evaluation determines that the economic limit stable daily yield of the H3 well is 2.50m 3 The steady daily yield and the accumulated crude oil yield of the H3 well in the linear decreasing period are shown in the Table 1 in detail.
Table 1 H3 well linear decreasing production data table
From Table 1 and known conditions, it can be determined that H3 wells average production days per month m, initial steady daily production q before well stimulation 0 And decreasing the cumulative yield N of crude oil prior to production o ：
m＝25d
q 0 ＝50m 3 /d
N o ＝0.0380×10 4 m 3
3) Calculating the initial daily reduction rate D of the H3 well according to the stable daily yield of the oil well in the linear reduction period di ；
And H3, determining the difference between adjacent stable daily yields in the decreasing period, and ensuring that the oil well follows a linear decreasing characteristic:
q t -q t+1 ＝q 0 D di ＝0.05m 3 /d
determination of H3 well economic limit stable daily yield q e
q e ＝2.50m 3 /d
Q in e Economic limit stable daily yield, m 3 /d；
4) Calculating the decreasing production life L of the H3 well; wherein decreasing production life L corresponds to the following formula:
5) Obtaining N which is produced from H3 well in a linear decreasing way until 950 days (19/6 years) of crude oil economy and can be recovered E ；N E The following formula is satisfied:
N E ＝6×10 -4 mLq 0 [2-D di (12mL+1)]＝2.491375×10 4 m 3
or (b)
In N E Crude oil economical recoverable reserves in straight line decreasingly period, 10 4 m 3 。
6) Calculation of economically recoverable reserves N of crude oil from oil well at 19/6 th (950 th) of straight line decreasing production of H3 well RE ：
N RE ＝N o +N E ＝0.0380+2.491375＝2.529375×10 4 m 3
The foregoing is merely illustrative of the embodiments of this invention and it will be appreciated by those skilled in the art that variations and modifications may be made without departing from the principles of the invention, and it is intended to cover all modifications and variations as fall within the scope of the invention.
Claims (6)
1. A method of determining the economic recoverable reserves of crude oil during a linear decay period, the method comprising the steps of:
1) Extracting petroleum in a target reservoir;
2) Based on the oil produced, the initial stable daily output of the stable production period before the linear decreasing production of the oil well is measured and determinedq 0 And linear decreasing period of stable daily outputq t Average decreasing production per monthDays (days)mAnd obtaining the accumulated crude oil yield before the decreasing production of the oil wellN o The method comprises the steps of carrying out a first treatment on the surface of the Wherein,q t production of oil well progressively decreasingtDay stable daily yield, m 3 /d；tDecreasing the production days for the oil well, d; stable daily production for day 1 of decreasing oil well productionq 1 ；
3) Calculating to obtain initial daily reduction rateD di The initial daily rate of declineD di The following formula is satisfied:
in the middle ofq 1 Stable daily production, m, on day 1 of decreasing production in oil well 3 /d；
q 0 Initial stable daily production, i.e. stable daily production before decreasing production of oil well, m 3 /d；
Determining an arithmetic difference of the steady daily output data in the linear decrementing periodq 0 D di ；
4) Calculating the decreasing production life of oil wellLThe method comprises the steps of carrying out a first treatment on the surface of the Wherein the production life is decreasedLThe following formula is satisfied:
in the middle ofq e Economic limit stable daily yield, m 3 /d；
5) Obtaining economic recoverable reserves of crude oil in linear decreasing periodN E ；N E The following formula is satisfied:
or (b)
In the middle ofN E Crude oil economical recoverable reserves in straight line decreasingly period, 10 4 m 3 ；
6) Calculating the economic recoverable reserves of the crude oil of the oil well;
in the middle ofN o Crude oil cumulative yield before oil well decreasing production, 10 4 m 3 ；
N RE Economic recoverable oil well crude oil reserve 10 4 m 3 。
2. The method of claim 1, wherein in step 1), oil in the target reservoir is produced using an oilfield development facility and corresponding production methods.
3. The method according to claim 1, wherein in step 2), oil well production data and wellhead stability daily production data are obtained by corresponding storage and transportation equipment.
4. The method of claim 1, wherein in step 3), the steady daily production rate for the straight run down period of the well is an arithmetic progression and the difference between any two adjacent steady daily production rates is constant.
5. The method of claim 1 wherein in step 2) the cumulative production of crude oil before the well is depleted is equal to the sum of the production of the various test activities and the production of the production during the stationary phase.
6. A system for determining linear-run-down crude oil economic recoverable reserves, the system being for implementing the method for determining linear-run-down crude oil economic recoverable reserves of any one of claims 1 to 5, the system comprising:
a data acquisition unit for acquiring initial steady daily yield in steady production period before oil well linear decrease production, steady daily yield in linear decrease period, average decrease production days per month and accumulated crude oil yield before oil well decrease production based on the extracted oil;
the data analysis processing unit is used for determining the economic recoverable oil well crude oil based on the initial stable daily yield of the stable production period before the oil well linearly decreases production, the stable daily yield of the linear decrease period, the average decreasing production days per month and the accumulated crude oil yield before the oil well decreases production and combining the economic limit stable daily yield.
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| CN102707333A (en) * | 2012-06-06 | 2012-10-03 | 陕西延长石油(集团)有限责任公司研究院 | Shale gas resource/reserve measurement method |
| CN102852505A (en) * | 2012-09-24 | 2013-01-02 | 于文英 | Oil production method for thin-medium thick layer super heavy oil hard-to-recover reserve |
| CN103293562A (en) * | 2013-05-06 | 2013-09-11 | 中国石油天然气股份有限公司 | Method and equipment for determining carbonate reservoir geological reserve |
| CN106779131A (en) * | 2015-11-24 | 2017-05-31 | 中国石油化工股份有限公司 | Grease hole evaluates phase cumulative production Forecasting Methodology |
| CN107423844A (en) * | 2017-06-06 | 2017-12-01 | 西南石油大学 | A kind of new method for predicting shale gas/tight gas wells recoverable reserves |
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