CN111861069A - Method and system for determining recoverable reserve of straight line descending oil well crude oil technology - Google Patents
Method and system for determining recoverable reserve of straight line descending oil well crude oil technology Download PDFInfo
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Abstract
The invention provides a method and a system for determining recoverable reserve of a straight line descending oil well crude oil technology, 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 yield of the steady production period before the descending production of the oil well, the stable daily yield of the steady production period of the descending production of the oil well and the accumulated yield of crude oil before the descending production of the oil well; further calculating to obtain an initial daily decrement rate, and further obtaining the recoverable reserves of the crude oil technology in the linear decrement period of the oil well; thereby further calculating the oil well crude oil technology recoverable reserves. The method can objectively and accurately determine the recoverable reserve of the straight descending oil well crude oil technology.
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 recoverable reserves of a straight line descending oil well crude oil technology, belongs to a recoverable reserve evaluation technology based on crude oil, and is suitable for the recoverable reserves calculation of the crude oil technology. More particularly, the invention relates to the field of crude oil resource/reserve evaluation.
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 production of crude oil in the decreasing phase on day t of decreasing production in oil well, m3；
q0Initial steady daily production (steady daily production before decreasing production of the well), m3/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-1, the stable daily production formula (1) of the generalized Arps decreasing model is transformed into a stable daily production formula under the oil well straight line decreasing type:
qt＝q0(1-tDdi) (3)
when the decreasing index n is-1, the crude oil cumulative yield formula (2) of the generalized Arps decreasing model in the straight decreasing period can be transformed into a crude oil technology recoverable reserve calculation formula in the straight decreasing period:
n 'in the formula'TArps straight decreasing phase crude oil technology recoverable reserve, 104m3。
Through analysis and comparison of ideal stable daily output equal difference data, the error of the stable daily output of the oil well is calculated to be 0 by adopting a formula (3), and the deviation of the recoverable reserves of the crude oil technology of the oil well is calculated by adopting a formula (4).
Disclosure of Invention
The invention aims to provide a method and a system for determining the recoverable reserve of a crude oil technology of a linear decreasing oil well in order to objectively evaluate the recoverable reserve of the crude oil technology of the linear decreasing oil well, eliminate obvious deviation existing when a generalized Arps decreasing model calculates the recoverable reserve of the crude oil technology in a linear decreasing period and integrally improve the calculation precision of the recoverable reserve of the crude oil.
In order to realize the purpose, the invention firstly measures the crude oil accumulated yield, the initial stable daily yield and the initial daily decrement rate before the oil well degressive production, and further calculates the recoverable reserve of the crude oil technology in the straight degressive period of the oil well, thereby providing the method and the system for evaluating the recoverable reserve of the crude oil technology in the oil well for determining the straight degressive period, which are particularly suitable for new oil reservoirs in old areas and conventionally developed oil reservoirs and are a new technology for determining the recoverable reserve of the crude oil technology in the straight degressive period of the oil well in each stage of exploration and development in oil fields.
In accordance with a specific embodiment of the present invention, there is provided a method for determining recoverable reserves of straight pull-down stage well crude oil technologies, 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 yield of the oil well in the stable production period before the linear degressive production, the stable daily yield of the oil well on the 1 st day of the degressive production and the accumulated yield of crude oil before the degressive production;
determining the recoverable reserve of the crude oil technology in the linear decreasing period of the oil well based on the initial stable daily yield in the stable period before the linear decreasing production of the oil well, the stable daily yield on the 1 st day of the linear decreasing production of the oil well and the accumulated yield of the crude oil before the linear decreasing production of the oil well; and further determining the oil well crude oil technology recoverable reserves.
According to the specific implementation scheme of the invention, in the method for determining the recoverable reserve of the crude oil technology of the straight-line decreasing oil well, the process of determining the recoverable reserve of the crude oil technology of the oil well in the straight-line decreasing period based on the initial stable daily output of the oil well in the stable period before the straight-line decreasing production, the stable daily output of the oil well in the decreasing production day 1 and the cumulative output of the crude oil before the oil well is decreased in the decreasing production 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 recoverable reserve of the crude oil technology in the straight descending period of the oil well based on the initial stable daily output and the initial daily descending rate of the stable production period before the straight descending production of the oil well;
and determining the recoverable reserve of the crude oil technology of the oil well based on the cumulative yield of the crude oil before the degressive production of the oil well and the recoverable reserve of the crude oil technology in the linear degressive period of the oil well.
According to the specific embodiment of the invention, in the method for determining the recoverable reserve of the crude oil technology of the straight-line decreasing oil well, when the initial daily decrement rate is determined based on the initial stable daily output of the oil well in the stable production period before the straight-line decreasing production and the stable daily output of the oil well on the 1 st day of the decreasing production, the initial daily decrement rate D is determined diThe following formula is satisfied:
in the formula q1Steady daily production on day 1 of well decreasing production, m3/d。
According to the specific implementation scheme of the invention, in the method for determining the recoverable reserve of the crude oil technology of the linear decreasing oil well, based on the initial stable daily output and the initial daily decreasing rate of the stable production period before the linear decreasing production of the oil well, when the recoverable reserve of the crude oil technology of the linear decreasing oil well period is determined, the recoverable reserve of the crude oil technology of the linear decreasing oil well period accords with the following formula:
in the formula NTStraight decreasing crude oil technical recoverable reserve of oil well, 104m3。
In some embodiments of the invention, the method of determining the recoverable reserve of a straight descending well crude oil technology of the present invention comprises:
1) extracting oil in the target oil reservoir;
2) based on the produced petroleum, measuring and obtaining the initial stable daily output q of the oil well in the stable production period before the linear decreasing production of the oil well0Stable daily production q during the well descentt(including steady daily production on day 1 of decreasing production from the well), cumulative production of crude oil N before decreasing production from the wello；
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 equal difference of the stable daily output data of the linear decreasing production oil well as q 0Ddi；
5) Obtaining the recoverable reserves of the crude oil technology in the straight descending period of the oil well; the recoverable reserve of the oil well linear descending period crude oil technology conforms to a formula;
in the formula NTStraight decreasing crude oil technical recoverable reserve of oil well, 104m3。
6) Calculating the recoverable reserves of the oil well crude oil technology; the recoverable reserves of the oil well crude oil technology accord with the formula;
NR＝No+NT(7)
in the formula NoCumulative production of crude oil before progressive reduction of oil well, 104m3；
NROil well crude oil technology recoverable reserves, 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 straight-line decreasing production 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 downgradedoIs equal to various testsThe sum of the oil production of the trial activities and the oil production of the stable period.
In another aspect, the present invention provides a system for determining recoverable reserve of a straight descending oil well crude oil technology, which is used for implementing the method for determining recoverable reserve of a straight descending oil well crude oil technology, and comprises:
The data acquisition unit is used for measuring and determining initial stable daily yield of the oil well in a stable production period before linear degressive production, stable daily yield of the oil well on the degressive production 1 day and accumulated yield of crude oil before degressive production of the oil well based on the produced oil;
the data analysis and processing unit is used for determining the recoverable reserve of the crude oil technology in the straight descending period of the oil well based on the initial stable daily output in the stable period before the straight descending production of the oil well, the stable daily output on the 1 st day of the descending production of the oil well and the accumulated output of the crude oil before the descending production of the oil well; and further determining the oil well crude oil technology recoverable reserves.
According to a specific embodiment of the present invention, the system for determining the recoverable reserve of a straight descending well crude oil technology may further comprise a petroleum recovery unit for recovering petroleum in the target reservoir.
According to an embodiment of the present invention, in the system for determining recoverable reserves of straight descending oil well crude oil technology according to the present invention, the data analysis processing unit may comprise:
the initial daily decrement rate determining module is used for determining an 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;
The crude oil technology recoverable reserve determining module is used for determining the crude oil technology recoverable reserve of the oil well in the straight descending stage based on the initial stable daily output and the initial daily descending rate of the stable production stage before the oil well in the straight descending stage;
and the oil well crude oil technology recoverable reserve determining module is used for determining the oil well crude oil technology recoverable reserve based on the crude oil cumulative yield before the oil well degressive production and the oil well straight degressive period crude oil technology recoverable reserve.
In accordance with an embodiment of the present invention, in the system for determining the recoverable reserve of a straight-line decreasing well crude oil technology, the initial daily decrement rate determining module may determine the initial daily decrement rate according to the following model formula:
in the formula q1Steady daily production on day 1 of well decreasing production, m3/d。
According to the specific embodiment of the invention, in the system for determining the recoverable reserve of the crude oil technology of the straight-line descending oil well, the recoverable reserve determining module of the crude oil technology of the straight-line descending period of the oil well can determine the recoverable reserve of the crude oil technology of the straight-line descending period of the oil well according to the following model formula:
in the formula NTStraight decreasing crude oil technical recoverable reserve of oil well, 104m3。
According to the specific embodiment of the invention, in the system for determining the recoverable reserve of the straight-line descending oil well crude oil technology, the recoverable reserve determining module of the oil well crude oil technology can determine the recoverable reserve of the oil well crude oil technology according to the following model formula:
NR＝No+NT(7)
In the formula NoCumulative production of crude oil before progressive reduction of oil well, 104m3；
NROil well crude oil technology recoverable reserves, 104m3。
In the system for determining the recoverable reserve of the crude oil technology of the linear degressive oil well, the data acquisition unit can be used for measuring the recovered petroleum to obtain the initial stable daily yield of the oil well in the stable production period before the linear degressive production, the stable daily yield of the oil well on the 1 st day of the degressive production and the accumulated yield of the crude oil before the linear degressive production. 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:
when the oil well yield is changed according to a straight line decreasing rule, a calculation method for the recoverable reserve of the crude oil technology in the straight line decreasing period of the oil well is established according to the attribute characteristics of the constant daily yield equal difference data series, so that the recoverable reserve of the crude oil technology in the straight line decreasing period of the oil well can be calculated, the error existing when the recoverable reserve of the crude oil technology of the oil well is calculated by utilizing a generalized Arps decreasing model is eliminated, and a convenient, accurate and effective evaluation method for the recoverable reserve of the crude oil technology of the straight line decreasing production oil well is provided for evaluating the crude oil resource/reserve of the straight line decreasing production oil well.
Drawings
Figure 1 is a production curve for the development area of the gulf of Wuli.
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
The embodiment takes the Wuliwan development area as an example, and provides a method for determining the recoverable reserves of the crude oil technology in the straight descending period of the oil 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 production data of a Wuliwan development area and wellhead stable daily output data through corresponding storage and transportation equipment;
cumulative production of 206.57 x 10 crude oil before degressive production in Wuliwan development area4m3The steady daily production and cumulative crude oil production of the development area was shown in the development area production data table 1 and fig. 1, which was a straight-line decreasing production from year 9.
Table 1 production data table for Wuliwan development area
From table 1 and known conditions, it can be determined that the wuliwan development area has an initial steady daily production (initial daily capacity) before decreasing production and a steady daily production on day 1 of decreasing production and a cumulative production of crude oil before decreasing production:
q0＝1065.37737m3/d
q1＝1065.28561m3/d
No＝206.57×104m3
3) Calculating the initial daily decrement rate D of the Wuliwan development areadi：
Determining the average value of the difference between adjacent stable daily yields of the oil well in the descending period, and ensuring that the yield of the oil well follows the straight line descending characteristic:
qt-qt+1＝q0Ddi＝0.09176m3/d
4) calculating the recoverable reserve N of crude oil technology in the straight descending period of the Wuliwan development areaT：
5) Calculating recoverable reserve N of crude oil technology in Wuliwan development areaR：
NR＝No+NT＝824.99×104m3
The geologic reserves of crude oil in the development area of Wu Li Wan are known to be 6067X 104m3Thus the recoverable reserve of the technology is ER824.99/6067 is 13.6%, which is in line with the actual development status of the Wuli bay development area.
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 the recoverable reserve of a straight descending well crude oil technique, 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 yield of the oil well in the stable production period before the linear degressive production, the stable daily yield of the oil well on the 1 st day of the degressive production and the accumulated yield of crude oil before the degressive production;
Determining the recoverable reserve of the crude oil technology in the linear decreasing period of the oil well based on the initial stable daily yield in the stable period before the linear decreasing production of the oil well, the stable daily yield on the 1 st day of the linear decreasing production of the oil well and the accumulated yield of the crude oil before the linear decreasing production of the oil well; and further determining the oil well crude oil technology recoverable reserves.
2. The method of claim 1, wherein determining the recoverable reserves of the crude oil from the well during the straight-line pull-down period based on the initial stable daily production from the stable production period before the straight-line pull-down production of the well, the stable daily production from the 1 st day of the straight-line pull-down production of the well, and the cumulative production of crude oil from the well before the straight-line pull-down production of the well, and further determining the recoverable reserves of the crude oil from the well 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 recoverable reserve of the crude oil technology in the straight descending period of the oil well based on the initial stable daily output and the initial daily descending rate of the stable production period before the straight descending production of the oil well;
and determining the recoverable reserve of the crude oil technology of the oil well based on the cumulative yield of the crude oil before the degressive production of the oil well and the recoverable reserve of the crude oil technology in the linear degressive period of the oil well.
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 D diThe following formula is satisfied:
in the formula q1Steady daily production on day 1 of well decreasing production, m3/d。
4. The method of claim 2 or 3, wherein when determining the recoverable reserve of the crude oil technology in the straight descending oil well period based on the initial steady daily output and the initial daily descending rate of the steady production period before the straight descending oil well period, the recoverable reserve of the crude oil technology in the straight descending oil well period conforms to the following formula:
in the formula NTStraight decreasing crude oil technical recoverable reserve of oil well, 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 steady production period before the descending production of the oil well0Stable daily production q during the well descenttAnd the cumulative yield N of crude oil before the degressive production of the oil wello；
3) Calculating to obtain an initial daily decrement rate DdiThe initial daily decrement rate DdiThe following formula is satisfied:
in the formula Ddi-initial daily rate of decrease, f, of the oil well;
q0initial steady daily production (steady daily production before decreasing production of the well), m3/d；
q1Steady daily production on day 1 of well decreasing production, m3/d；
Determining the equal difference of stable daily output data of linear degressive production as q0Ddi；
4) Obtaining the recoverable reserves of the crude oil technology in the straight descending period of the oil well; the recoverable reserve of the oil well linear descending period crude oil technology conforms to a formula;
In the formula NTStraight decreasing crude oil technical recoverable reserve of oil well, 104m3；
5) Calculating recoverable reserve N of oil well crude oil technologyR(ii) a Recoverable reserve N of oil well crude oil technologyRThe formula is met;
NR＝No+NT(7)
in the formula NoCumulative production of crude oil before progressive reduction of oil well, 104m3；
NROil well crude oil technology recoverable reserves, 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 as claimed in claim 1, wherein in step 3), the stable daily production of the straight descending production of the oil well is in an arithmetic progression, and the difference between any two adjacent stable daily productions is constant.
9. The method of claim 1, wherein in step 2), the cumulative production of crude oil N before the well is downgraded for productionoEqual to the sum of the oil production of various test activities and the oil production in the stable period.
10. A system for determining the recoverable reserve of a straight pull-down oil well crude oil technology for carrying out the method of any one of claims 1 to 9, the system comprising:
The data acquisition unit is used for measuring and determining initial stable daily yield of the oil well in a stable production period before linear degressive production, stable daily yield of the oil well on the degressive production 1 day and accumulated yield of crude oil before degressive production of the oil well based on the produced oil;
the data analysis and processing unit is used for determining the recoverable reserve of the crude oil technology in the straight descending period of the oil well based on the initial stable daily output in the stable period before the straight descending production of the oil well, the stable daily output on the 1 st day of the descending production of the oil well and the accumulated output of the crude oil before the descending production of the oil well; and further determining the oil well crude oil technology recoverable reserves.
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| CN107563557A (en) * | 2017-09-05 | 2018-01-09 | 中国石油天然气股份有限公司 | Method and device for determining oil well yield reduction rate |
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| CN105569646A (en) * | 2014-11-05 | 2016-05-11 | 中国石油化工股份有限公司 | Oil and gas well technical recoverable reserves prediction method |
| CN105528656A (en) * | 2015-12-29 | 2016-04-27 | 中国石油天然气股份有限公司 | Method and device for determining oil field yield reduction rate data |
| CN107451924A (en) * | 2016-05-30 | 2017-12-08 | 中国石油天然气股份有限公司 | Oil reservoir development effect evaluation method |
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