CN111861064A - Method and system for determining economic recoverable reserves of crude oil by adopting stable daily output - Google Patents
Method and system for determining economic recoverable reserves of crude oil by adopting stable daily output Download PDFInfo
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Abstract
The invention provides a method and a system for determining the economic recoverable reserves of crude oil by adopting stable daily output, wherein the method comprises the following steps: extracting oil in the target oil reservoir; based on the produced petroleum, measuring and determining the initial stable daily output q of the oil well in the stable production period before the linear decreasing production of the oil well0And stable daily yield q in straight decreasing periodtAnd averagely decreasing the production days m every month, and determining the cumulative yield N of the crude oil before the oil well is decreased to produceo(ii) a Further, an initial daily decrement rate D is determined by calculationdiAnd determining the equal difference q of the stable daily output data of the straight line descending period0DdiDetermining the decreasing production life L of the oil well by combining the economic limit stable daily output; further determining the straight line decreasing period crude oil economic recoverable reserve NEFurther determining the economic recovery of crude oil from the wellReserve NRE. The method can objectively and accurately calculate the crude oil economical recoverable reserve of the straight descending period corresponding to the oil well economic limit stable daily yield.
Description
Technical Field
The invention relates to the field of exploration and development of oil fields, in particular to a method and a system for determining the economic recoverable reserve of crude oil of a straight-line descending oil well by using stable daily output, which belong to the technology based on evaluation of recoverable reserve of crude oil and are suitable for calculating the economic recoverable reserve of crude oil. More particularly, the invention relates to the fields of economic evaluation of crude oil from oil wells, evaluation of crude oil resources/reserves, and the like.
Background
As early as 1945, Arps gave three decreasing types of well production: the method comprises the following steps of exponential decrement, hyperbolic decrement and harmonic decrement, wherein the application range of the decrement index is defined to be n which is more than or equal to 0 and less than or equal to 1, for example, the calculation method of the economic recoverable reserve in SY/T5367-2010 petroleum recoverable reserve calculation method (published by petroleum industry publishers) only refers to the calculation method under the conditions of exponential decrement, hyperbolic decrement and harmonic decrement. In practical applications, the method and application of the oil field yield decrement rate (second edition) (zhang, published by the petroleum industry press 2015.), "establishment, comparison and application of a linear decrement type" (ten thousand, zhou cui, "petroleum institute" vol 36, No. 8, year 2015), "establishment and application of a generalized decrement model" (ten thousand, tang, wo, 37, No. 11, 2016) extend the application range of the decrement index (n) in the hyperbolic decrement model to (-10, 10) or (— infinity), and are referred to as "generalized Arps decrement model":
in the formula Ddi-initial daily decrement rate, f;
n-decreasing index;
Ntcumulative yield of crude oil at decreasing stages (q-free)0And previous yield), m3；
q0Initial steady daily production (steady daily production before decreasing production of the well), m 3/d；
qtSteady daily production on day t of well decreasing production, m3/d；
t-decreasing production days (t is more than or equal to 1) of the oil well, d.
When the decreasing index n is equal to-1, the stable daily production formula (1) of the generalized Arps decreasing model in the linear decreasing period is transformed into a stable daily production formula under the linear decreasing type:
qt＝q0(1-tDdi) (3)
when the decreasing index n is-1, the economic limit stable daily yield is qe[ corresponding to the Stable daily output q in equation (3) ]tStabilization of daily output q from economic limitseAnd when the descending production days t of the oil well is replaced by 12mL of descending production life of the oil well, the descending period crude oil cumulative yield formula (2) of the generalized Arps descending model can be transformed into a descending period crude oil economical recoverable reserve calculation formula by combining the formula (3):
N′E＝1.2×10-3mLq0(1-6mLDdi) (4)
wherein L is the decreasing production life of the oil well, a;
m-average decreasing production days per month (m is more than or equal to 1 and less than 31), d;
N′Eeconomic recoverable reserves of Arps Linear decreasing periods crude oil, 104m3。
Through analysis and comparison of the data of the equal difference of the stable daily output of the ideal straight line decreasing period, the error of the stable daily output of the oil well in the straight line decreasing period is calculated to be 0 by adopting a formula (3), and the economic recoverable reserves of the crude oil in the straight line decreasing period are calculated by adopting a formula (4) to have obvious deviation.
Disclosure of Invention
The invention aims to objectively evaluate the resource potential of a straight line descending oil well at an economic limit time point, eliminate obvious deviation existing when a generalized Arps descending model calculates the crude oil economic recoverable reserve of the straight line descending oil well, and establish a novel method and a system for determining the crude oil economic recoverable reserve of the straight line descending oil well so as to objectively and accurately evaluate the oil well or evaluate the crude oil resource/reserve potential of a unit.
In order to realize the purpose, the invention firstly measures the crude oil accumulated yield before the degressive production of the oil well, the initial stable daily yield and the degressive period stable daily yield, and further calculates and obtains the straight degressive period crude oil economic recoverable reserve and the oil well crude oil economic recoverable reserve corresponding to the economic limit time point of the oil well, thereby providing the evaluation method and the system for determining the straight degressive period crude oil economic recoverable reserve by using the stable daily yield.
In accordance with a particular embodiment of the present invention, there is provided a method for determining the economically recoverable reserve of a straight descending crude oil, the method comprising the steps of:
extracting oil in the target oil reservoir;
based on the produced petroleum, measuring and determining the initial stable daily output of the oil well in the stable production period before the linear decreasing production, the stable daily output of the oil well in the linear decreasing period and the average decreasing production days per month, and determining the cumulative output of crude oil before the linear decreasing production of the oil well;
the economic recoverable reserve of the crude oil in the oil well is determined based on the initial stable daily output of the oil well in the stable production period before the linear decreasing production, the stable daily output of the linear decreasing period, the decreasing production days per month averagely, the accumulated yield of the crude oil before the oil well decreasing production and the economic limit stable daily output.
According to the specific embodiment of the invention, the method for determining the economic recoverable reserve of crude oil in the straight descending period comprises the following steps of based on the initial stable daily output in the stable period before the straight descending production of the oil well, the stable daily output in the straight descending period, the average descending production days per month, the cumulative output of crude oil before the descending production of the oil well and the economic limit stable daily output, wherein the step of determining the economic recoverable reserve of crude oil in the oil well comprises the following steps:
determining an initial daily decrement rate based on the initial stable daily output of the stable production period before the oil well linearly decremental production and the stable daily output of the 1 st day of the oil well decremental production;
determining the degressive production life of the oil well based on the initial stable daily output of the stable production period before the linear degressive production of the oil well, the average degressive production days per month and the initial daily decrement rate and combining the economic limit stable daily output;
determining the economic recoverable reserve of crude oil in the straight-line decreasing period based on the initial stable daily output in the stable production period before the straight-line decreasing production of the oil well, the average decreasing production days per month, the initial daily decreasing rate and the decreasing production life of the oil well; or determining the economic recoverable reserve of the crude oil in the straight-line decreasing period based on the stable daily yield of the oil well decreasing production day 1, 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 cumulative yield of the crude oil before the degressive production of the oil well and the economic recoverable reserves of the crude oil in the straight degressive period.
According to a specific embodiment of the present invention, in the method for determining the economic recoverable reserve of crude oil during the straight-line decreasing period according to the present invention, when the initial daily decrement rate is determined based on the initial steady daily production during the steady production period before the straight-line decreasing production of the oil well and the steady daily production on the 1 st day of the decreasing production of the oil well, the initial daily decrement rate D is determineddiThe following formula is satisfied:
in the formula q1Steady daily production on day 1 of well decreasing production, m3/d。
According to the specific embodiment of the invention, when the decreasing production life of the oil well is determined 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 per month and the initial daily decreasing rate in combination with the economic limit stable daily output, the decreasing production life L accords with the following formula:
in the formula qeEconomic ultimate Stable daily yield, m3/d。
According to the specific embodiment of the invention, in the method for determining the economic recoverable reserve of the crude oil in the straight descending period, when the economic recoverable reserve of the crude oil in the straight descending period is determined on the basis of the initial stable daily output in the stable production period before the straight descending production of the oil well, the average descending production days per month, the initial daily decrement rate and the descending production life of the oil well, the economic recoverable reserve N of the crude oil in the straight descending period EThe following formula is satisfied:
NE＝6×10-4mLq0[2-Ddi(12mL+1)](7)
in the formula NEStraight decreasing phase crude oil economic recoverable reserve, 104m3；
Or when the straight-line decreasing period crude oil economical recoverable reserve N is determined based on the stable daily output of the oil well decreasing production day 1, the average decreasing production days per month, the initial daily decreasing rate and the decreasing production life of the oil well, the straight-line decreasing period crude oil economical recoverable reserve NEThe following formula is satisfied:
in the formula NEStraight decreasing phase crude oil economic recoverable reserve, 104m3。
In some embodiments of the invention, the method of determining the straight-line pull-down period economic recoverable capacity of crude oil of the present invention comprises:
1) extracting oil in the target oil reservoir;
2) measuring and obtaining oil well oil production data and wellhead stable daily output data based on the produced oil;
wherein the oil well oil production data comprises an initial stable daily production q before the oil well decreases0Decreasing cumulative yield N before productiono；
The data of the stable daily output of the wellhead refer to the stable daily output q in the descending periodtAnd decreasing the production days m every month on average in the decreasing period;
3) calculating to obtain an initial daily decrement rate DdiThe initial daily decrement rate DdiThe following formula is satisfied:
in the formula q1Steady daily production on day 1 of well decreasing production, m3/d；
Determining the isodyne of the steady daily production data of the decreasing period as q 0Ddi；
4) Calculating the decreasing production life L of the oil well; wherein the decreasing production life L of the oil well conforms to the following formula:
in the formula qeEconomic ultimate Stable daily yield, m3/d。
5) Obtaining the economic recoverable reserve N of the crude oil with a straight decreasing periodE；NEThe following formula is satisfied:
NE＝6×10-4mLq0[2-Ddi(12mL+1)](7)
or
In the formula NEStraight decreasing phase crude oil economic recoverable reserve, 104m3；
6) Calculating to obtain the economic recoverable reserves of the crude oil of the oil well;
NRE＝No+NE(9)
in the formula NoCumulative production of crude oil before progressive reduction of oil well, 104m3；
NREEconomic recoverable reserves of crude oil from oil wells, 104m3。
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 a corresponding production mode.
According to the specific embodiment of the invention, oil well oil production data and wellhead stable daily output data are obtained through corresponding storage and transportation equipment based on the produced oil.
According to the specific embodiment of the invention, the stable daily output of the oil well in the linear decreasing period is an arithmetic progression, and the difference value of any two adjacent stable daily outputs is a constant q0Ddi。
According to an embodiment of the invention, the cumulative production of crude oil N before the well is downgradedoEqual to the sum of the oil production of various test activities and the oil production in the stable period.
In another aspect, the present invention provides a system for determining the economic recoverable amount of crude oil during a straight descending period, which is used for implementing the method for determining the economic recoverable amount of crude oil during a straight descending period according to the present invention, the system comprising:
The data acquisition unit is used for acquiring initial stable daily output of the oil well in a stable production period before linear degressive production, stable daily output of the oil well in a linear degressive period, average degressive production days per month and cumulative output of crude oil before the oil well degressive production based on the extracted oil;
and the data analysis processing unit is used for determining the economic recoverable storage capacity of the crude oil in the oil well based on the initial stable daily output of the stable production period before the linear decreasing production of the oil well, the stable daily output of the linear decreasing period, the average decreasing production days per month, the accumulated output of the crude oil before the linear decreasing production of the oil well and the economic ultimate stable daily output.
According to a specific embodiment of the present invention, the system may further include a petroleum production unit for producing petroleum in the target reservoir.
In the system for determining the straight-line pull-down period economic recoverable capacity of crude oil according to the embodiment of the present invention, the data analysis processing unit may include:
the oil well degressive production life determining module is used for determining the degressive production life of the oil well based on the initial stable daily output of the stable production period before the linear degressive production of the oil well, the average degressive production days per month and the initial daily decrement rate and in combination with the economic limit stable daily output;
The straight line decreasing period crude oil economical recoverable storage determining module is used for determining the straight line decreasing period crude oil economical recoverable storage based on the initial stable daily output of the stable production period before the oil well straight line decreasing production, the average decreasing production days per month, the initial daily decreasing rate and the decreasing production life of the oil well; or, the method is used for determining the economic recoverable reserve of the crude oil in the straight-line decreasing period based on the stable daily output of the oil well decreasing production day 1, the average decreasing production days per month, the initial daily decreasing rate and the decreasing production life of the oil well;
and the oil well crude oil economic recoverable reserve determining module is used for determining the oil well crude oil economic recoverable reserve based on the crude oil accumulated yield before the oil well degressive production and the crude oil economic recoverable reserve in the straight degressive period.
According to an embodiment of the present invention, in the system for determining the economic recoverable amount of crude oil during a straight-line pull-down period according to the present invention, the data analysis processing unit may further include:
and the initial daily decrement rate determining module is used for determining the initial daily decrement rate based on the initial stable daily output of the stable production period before the oil well linearly decrements the production and the stable daily output of the 1 st day of the oil well decrementing the production.
According to a further embodiment of the present invention, in the system for determining the economic recoverable capacity of crude oil during the straight-line decreasing period, the initial daily decrement rate determining module can calculate the initial daily decrement rate D according to the following model formula di：
In the formula q1Steady daily production on day 1 of well decreasing production, m3/d；
Determining the isodyne of the steady daily production data of the decreasing period as q0Ddi；
In accordance with a further embodiment of the present invention, in the system for determining the economic recoverable amount of crude oil during a straight-line pull-down period, the well pull-down productive life determining module may calculate the well pull-down productive life L according to the following model formula:
in the formula qeEconomic ultimate Stable daily yield, m3/d。
According to a further embodiment of the present invention, in the system for determining the economic recoverable amount of crude oil in the straight decreasing period of the present invention, the module for determining the economic recoverable amount of crude oil in the straight decreasing period can calculate the economic recoverable amount of crude oil N in the straight decreasing period according to the following model formulaE：
NE＝6×10-4mLq0[2-Ddi(12mL+1)](7)
Or
In the formula NEStraight decreasing phase crude oil economic recoverable reserve, 104m3；
According to a further embodiment of the present invention, in the system for determining the economic recoverable amount of crude oil during the straight descending period, the economic recoverable amount determining module of crude oil for oil well can calculate the economic recoverable amount of crude oil for oil well according to the following model formula:
NRE＝No+NE(9)
in the formula NoCumulative production of crude oil before progressive reduction of oil well, 104m3；
NREEconomic recoverable reserves of crude oil from oil wells, 104m3。
In the system for determining the economic recoverable reserve of crude oil in the straight descending period, the data acquisition unit can be a measuring device for measuring the recovered petroleum to obtain the initial stable daily output of the oil well in the stable period before the straight descending production, the stable daily output of the straight descending period, the average descending production days per month and the accumulated output of the crude oil before the straight descending production of the oil well. The data analysis processing unit may be a computer device for analyzing and processing data, or may be a virtual device (e.g., through manual computation).
The invention has the beneficial effects that:
any oil well enters a yield decreasing production stage along with the lapse of the exploitation time, when the yield change of the decreasing stage belongs to a straight line decreasing type, based on the law of the yield decreasing production change of the oil well, the method establishes a method for measuring and calculating the economic recoverable reserve of the crude oil in the straight line decreasing stage, can objectively and accurately calculate the economic recoverable reserve of the crude oil in the straight line decreasing stage corresponding to the stable daily yield of the economic limit of the oil well, and can objectively and accurately calculate the error calculated by using a formula of the economic recoverable reserve of the crude oil in the straight line decreasing stage to be 0, thereby eliminating the error existing when the economic recoverable reserve of the crude oil in the decreasing stage of the oil well is calculated by using a generalized Arps decreasing model, and providing a convenient, accurate and effective evaluation method for evaluating the economic recoverable reserve of the crude oil and evaluating crude oil resources/reserves of.
Detailed Description
The following detailed description is provided for the purpose of illustrating the embodiments and the advantageous effects thereof, and is not intended to limit the scope of the present disclosure. In the examples, the experimental methods in which specific conditions are not noted are conventional methods and conventional conditions well known in the art.
Example 1
This example, which is exemplified by a well H3, provides a method for determining the economic recoverable reserve of crude oil during a straight-line pull-down period of a well. The method comprises the following steps:
1) adopting oil field development equipment and a corresponding production mode to extract petroleum in a target oil reservoir;
2) based on the produced oil, measuring and obtaining oil well oil production data and wellhead stable daily output data through corresponding storage and transportation equipment;
wherein the oil well oil production data comprises the initial stable daily output q of the steady production period before the descending production of the oil well0Linear decreasing period stable daily output qtThe average production days m decrease every month in the decreasing period; cumulative yield N of crude oil before progressive reduction production of oil wello；
Wherein q istFor steady daily production on day t of well decreasing production, m3D; t is the decreasing production days of the oil well, d;
the cumulative yield of crude oil before H3 well straight-line degressive production is 380m3And the average production is decreased by 25 days every month, and the economic evaluation determines that the economic limit stable daily production of the H3 well is 2.50m3The linear descending stable daily production and the cumulative crude oil production of the H3 well are shown in the descending production data of the H3 well in the table 1.
TABLE 1H 3 well straight-line degressive production data sheet
From Table 1 and known conditions, it can be determined that H3 wells average decrement days of production m per month and the initial steady daily production q before well decrements 0And decreasing the cumulative yield N of crude oil before productiono：
m＝25d
q0＝50m3/d
No＝0.0380×104m3
3) According to the stable daily output of the oil well in the linear decreasing period, calculating the initial daily decreasing rate D of the H3 welldi；
H3 well, determining the difference between adjacent stable daily production of descending period, ensuring that the oil well follows the straight descending characteristic:
qt-qt+1＝q0Ddi＝0.05m3/d
determination of the economic ultimate stable daily production q of H3 welle
qe＝2.50m3/d
In the formula qeEconomic ultimate Stable daily yield, m3/d；
4) Calculating the descending production life L of the H3 well; wherein the decreasing production life L conforms to the following formula:
5) obtaining the economic recoverable reserves N of crude oil produced by H3 wells linearly and progressively decreased to 950 days (19/6 years)E；NEThe following formula is satisfied:
NE＝6×10-4mLq0[2-Ddi(12mL+1)]＝2.491375×104m3
or
In the formula NEStraight decreasing phase crude oil economic recoverable reserve, 104m3。
6) Calculating the economic recoverable reserves N of crude oil of the oil well at 19/6 years (950 days) of straight-line degressive production of the H3 wellRE：
NRE＝No+NE＝0.0380+2.491375＝2.529375×104m3
The foregoing is directed to embodiments of the present invention, and it is understood that various modifications and improvements can be made by those skilled in the art without departing from the spirit of the invention.
Claims (10)
1. A method of determining an economically recoverable reserve of crude oil for a straight-decreasing period, the method comprising the steps of:
extracting oil in the target oil reservoir;
based on the produced petroleum, measuring and determining the initial stable daily output of the oil well in the stable production period before the linear decreasing production, the stable daily output of the oil well in the linear decreasing period and the average decreasing production days per month, and determining the cumulative output of crude oil before the linear decreasing production of the oil well;
The economic recoverable reserve of the crude oil in the oil well is determined based on the initial stable daily output of the oil well in the stable production period before the linear decreasing production, the stable daily output of the linear decreasing period, the decreasing production days per month averagely, the accumulated yield of the crude oil before the oil well decreasing production and the economic limit stable daily output.
2. The method of claim 1 wherein determining the economic recoverable capacity of the crude oil from the well based on the initial steady-state daily production during the steady-state period before the straight-line decreasing production of the well, the steady-state daily production during the straight-line decreasing period, the average decreasing production days per month, and the cumulative production of crude oil from the well before the decreasing production, in combination with the economic limit steady-state daily production, comprises:
determining an initial daily decrement rate based on the initial stable daily output of the stable production period before the oil well linearly decremental production and the stable daily output of the 1 st day of the oil well decremental production;
determining the degressive production life of the oil well based on the initial stable daily output of the stable production period before the linear degressive production of the oil well, the average degressive production days per month and the initial daily decrement rate and combining the economic limit stable daily output;
determining the economic recoverable reserve of crude oil in the straight-line decreasing period based on the initial stable daily output in the stable production period before the straight-line decreasing production of the oil well, the average decreasing production days per month, the initial daily decreasing rate and the decreasing production life of the oil well; or determining the economic recoverable reserve of the crude oil in the straight-line decreasing period based on the stable daily yield of the oil well decreasing production day 1, 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 cumulative yield of the crude oil before the degressive production of the oil well and the economic recoverable reserves of the crude oil in the straight degressive period.
3. The method of claim 2, wherein when the initial daily decrement rate is determined based on the initial steady-state daily production during the steady-state period before the straight-line decreasing production of the oil well and the steady-state daily production on the 1 st day of the decreasing production of the oil well, the initial daily decrement rate DdiThe following formula is satisfied:
in the formula q1Steady daily production on day 1 of well decreasing production, m3/d；
Preferably, 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:
in the formula qeEconomic ultimate Stable daily yield, m3/d。
4. The method of claim 2 or 3, wherein the straight-line decreasing-period crude oil economic recoverable reserve N is determined when the straight-line decreasing-period crude oil economic recoverable reserve is determined based on the initial steady daily production of the steady production period before the straight-line decreasing production of the oil well, the average decreasing production days per month, the initial daily rate of decrease, and the decreasing production life of the oil wellEThe following formula is satisfied:
NE＝6×10-4mLq0[2-Ddi(12mL+1)](7)
in the formula NEStraight decreasing phase crude oil economic recoverable reserve, 10 4m3；
Alternatively, the stability of day 1 of decreasing production based on oil wellThe economic recoverable reserve N of the crude oil in the straight line decreasing period is determined by the daily output, the average decreasing production days per month, the initial daily decreasing rate and the decreasing production life of the oil wellEThe following formula is satisfied:
in the formula NEStraight decreasing phase crude oil economic recoverable reserve, 104m3。
5. The method of claim 1, comprising:
1) extracting oil in the target oil reservoir;
2) based on the produced petroleum, measuring and determining the initial stable daily output q of the oil well in the stable production period before the linear decreasing production of the oil well0And stable daily yield q in straight decreasing periodtAnd decreasing the production days m averagely every month and obtaining the cumulative yield N of the crude oil before the oil well is decreasedo；
3) Calculating to obtain an initial daily decrement rate DdiThe initial daily decrement rate DdiThe following formula is satisfied:
in the formula q1Steady daily production on day 1 of well decreasing production, m3/d；
Determining the isodyne q of the stable daily output data of the linear decreasing period0Ddi；
4) Calculating the decreasing production life L of the oil well; wherein the decreasing production life L conforms to the following formula:
in the formula qeEconomic ultimate Stable daily yield, m3/d；
5) Obtaining a straight descending crude oil channelEconomic recovery reserve NE；NEThe following formula is satisfied:
NE＝6×10-4mLq0[2-Ddi(12mL+1)](7)
or 
In the formula NEStraight decreasing phase crude oil economic recoverable reserve, 104m3；
6) Calculating to obtain the economic recoverable reserves of the crude oil of the oil well;
NRE＝No+NE(9)
in the formula NoCumulative production of crude oil before progressive reduction of oil well, 104m3；
NREEconomic recoverable reserves of crude oil from oil wells, 104m3。
6. The method of claim 1, wherein in step 1), oil in the target reservoir is produced using oil field development equipment and corresponding production methods.
7. The method according to claim 1, wherein in step 2), the oil well production data and the wellhead stable daily production data are obtained by corresponding storage and transportation equipment.
8. The method of claim 1, wherein in step 3), the steady daily production for the straight descending period of the oil well is in an arithmetic progression, and the difference between any two adjacent steady daily productions is constant.
9. The method of claim 1, wherein in step 2), the cumulative production of crude oil before the well pull-down is equal to the sum of the oil production of each test activity and the oil production during the steady state.
10. A system for determining the linearly decreasing crude oil economically recoverable reserve of any one of claims 1 to 9, the system comprising:
the data acquisition unit is used for acquiring initial stable daily output of the oil well in a stable production period before linear degressive production, stable daily output of the oil well in a linear degressive period, average degressive production days per month and cumulative output of crude oil before the oil well degressive production based on the extracted oil;
And the data analysis processing unit is used for determining the economic recoverable storage capacity of the crude oil in the oil well based on the initial stable daily output of the stable production period before the linear decreasing production of the oil well, the stable daily output of the linear decreasing period, the average decreasing production days per month, the accumulated output of the crude oil before the linear decreasing production of the oil well and the economic ultimate stable daily output.
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