CN113112073A - Method for determining natural yield reduction rate of old well foundation of oil field - Google Patents

Method for determining natural yield reduction rate of old well foundation of oil field Download PDF

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CN113112073A
CN113112073A CN202110400553.6A CN202110400553A CN113112073A CN 113112073 A CN113112073 A CN 113112073A CN 202110400553 A CN202110400553 A CN 202110400553A CN 113112073 A CN113112073 A CN 113112073A
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赵思远
高振东
孟选刚
唐后军
赵习森
党海龙
罗麟
吴长辉
王崟
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Shaanxi Yanchang Petroleum Group Co Ltd
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Abstract

The invention discloses a method for determining the natural decline rate of the basic yield of an old well of an oil field, which comprises the following steps: (1) acquiring the annual output data of each oil field or each oil production plant in the oil field; (2) calculating the calibrated daily output level q of the new well at the end of the last year＇ i(ii) a (3) Calculating and calibrating daily output level q of old well at the end of last year i(ii) a (4) New well daily output level ratio Q of last year of calculation＇ iThe daily output level of the old well at the end of the last year accounts for Q i(ii) a (5) Calculating the natural decrease rate D of the new well in the last year＇ i(ii) a (6) Calculating the natural degressive rate value D of the pure old wellN i(ii) a (7) Natural decline rate D of oil field old well basic yieldi. The method for determining the natural decline rate of the base yield of the old well of the oil field can truly reflect the development effect, effectively release the yield of the old well, and provide certain data support for subsequent development, production allocation and production planningAnd the high-benefit development of the oil field is realized, and the expected production capacity is achieved.

Description

Method for determining natural yield reduction rate of old well foundation of oil field
Technical Field
The invention relates to the technical field of petroleum development, in particular to a method for determining the natural decline rate of the basic yield of an old well of an oil field.
Background
In dynamic analysis of oil field development, injection allocation and production allocation and development and production planning, the development change rules of oil fields, blocks, well groups and single wells are analyzed by using the decrement rate and the future development trend is predicted. At present, a plurality of methods for calculating the decrement rate can reflect the decrement of the yield from different sides, but the methods have different meanings and different application ranges. The conventional decreasing rate method for oil field production allocation and production planning is ministerial issuing method, equal difference method and year-to-year method. However, the method does not consider the conditions that the yield change of a new well every year in the actual exploitation process and the yield of the new well in the next few years have influence on the basic yield of the old well of the oil field, the water injection scale is enlarged, the development effect is good and the like in the actual exploitation process, so that the yield data of the oil field comprises the yield data of various conditions, and the obtained reduction rate has certain errors due to the influence of factors such as management, weather and the like, so that the problems of insufficient yield release of the old well, surplus yield of the new well, high investment and poor benefit in the oil field development and production allocation can not be really reflected.
Therefore, a method for determining the natural decline rate of the base production of the old well in the oil field is needed.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a method for determining the natural yield reduction rate of the old well of the oil field, which can provide certain data support for subsequent development, production allocation and production planning and realize high-benefit development of the oil field.
A method for determining the natural decline rate of the basic yield of an old well of an oil field comprises the following steps:
(1) acquiring the annual output data of each oil field or each oil production plant in the oil field;
(2) calculating the new well daily output level q' of last yeari：
When the data acquired in the step (1) is the production data of the oil field in the past year,
q＇ithe new well single well daily output level at the end of the year is calibrated multiplied by the number of wells opened in 12 months,
the calibrated end-of-year daily production level of the single new well is 12 months daily production level of the single new well (11 months daily production level of the single new well-12 months daily production level of the single new well);
when the data acquired in the step (1) is the annual production data of each oil production plant in the oil field,
q＇ifor the calibrated daily production level q' of the new well at the end of the last year of each oil production planti oil production plantThe sum of the total weight of the components,
wherein ,q＇i oil production plantThe new well single well daily output level at the end of the year is calibrated multiplied by the number of wells opened in 12 months,
the calibrated daily production level of the single well of the new well at the end of the year is 12 months of daily production level of the single well of the new well (11 months of daily production level of the single well of the new well-12 months of daily production level of the single well of the new well);
taking 1,2,3 … … in the ith year after the oil field construction period;
(3) calculating and calibrating daily output level q of old well at the end of last yeari：
When the data acquired in the step (1) is the production data of the oil field in the past year,
Figure BDA0003020082180000021
when the data acquired in the step (1) is the annual production data of each oil production plant in the oil field,
qidaily production level q of old well in last year end for calibration of each oil production planti oil production plantThe sum of the total weight of the components,
wherein ,
Figure BDA0003020082180000022
(4) last year of calculationDaily output level ratio Q' of XinjingiThe daily output level of the old well at the end of the last year accounts for Qi：
(41) Calculating the daily output level N of the oil field at the end of the last year: for the nominal daily yield level q' of the new well at the end of the last yeariAnd the calibrated daily output level q of the old well at the end of the last yeariSumming;
(42) new well daily output level ratio Q' at the end of last yeari: for the nominal daily yield level q' of the new well at the end of the last yeariThe oil field daily output level N accounts for the ratio of the oil field daily output level N at the end of the last year;
(43) daily output level ratio Q of old well at last year of last yeari: for a calibrated daily output level q of the old well at the end of the last yeariThe oil field daily output level N accounts for the ratio of the oil field daily output level N at the end of the last year;
(5) natural decrement rate D' of last year new welli：
Natural decrement rate D' of last year well in first yeariFor the natural rate of decline of the first year after the last new well construction period of the ith year after the oil field construction period, when the actual production of the first year after the new well construction period has not yet occurred, D ″iData of the last year is used;
wherein ,
when the data acquired in the step (1) is the production data of the oil field in the past year,
Figure BDA0003020082180000023
Figure BDA0003020082180000024
when the data acquired in the step (1) is the annual production data of each oil production plant in the oil field,
Figure BDA0003020082180000025
the yield of the new well in the construction period when the time is full is the sum of the yields of the new wells in the construction periods when the time is full of each oil production plant in the construction period; the actual yield of the first year after the new well construction period is the sum of the actual yields of the first year after the new well construction period of each oil production plant, and the yield of the new well construction period of the oil production plant when the annual time rate is full is calculated according to the following formula:
Figure BDA0003020082180000026
(6) calculating the natural degressive rate value D of the pure old wellNi：
Calculating the natural decline rate D of the old well all the year round by using the formula of the decline rate of the ministry enactment lawNiThe natural decline rate of the next-year old-well is calculated by predicting the absolute value of the difference between the natural decline rate of the next-year old-well and the current year difference by using an equal difference method according to a formula (4);
Figure BDA0003020082180000031
wherein the actual yield of the pure old well in the year is the actual yield of the old well in the year-the actual yield of the new well in the last year after the construction period;
(7) natural decline rate D of oil field old well basic yieldi：
(71) The first year after the oil field construction period has two conditions:
(711) if the oil field is a new oil area, the old well does not exist in the last year in the first year after the construction period, and the natural decreasing rate of the new well is D which is the natural decreasing rate of the old well of the oil field1＝D＇1；
(712) If the oil field is an old oil area and a certain year is the first year after the construction period of the oil field, the old well and the new well of the previous year exist at the same time, and the natural decline rate of the oil field of the first year after construction is D1＝Q1×DN1+Q＇1×D＇1；
(72) The second year after the oil field construction period:
the new well in the first year after the oil field construction period is the old well in the second year, and the natural decreasing rate of the old well in the oil field is
D2＝Q2DN2+Q＇2×D＇2＝Q2(DN1+C2)+Q＇2×D＇2＝Q2DN1+Q2C2+Q＇2×D＇2，
wherein ,C2The natural decreasing rate of the old well in the second year after the construction period is larger than the absolute value of the annual difference value, C2Is equal to DN2Subtract DN1；
In the third year after the oil field construction period, the natural decreasing rate of the old well of the oil field is
D3＝Q3DN3+Q＇3×D＇3＝Q3(DN2+C3)+Q＇3×D＇3＝Q3(DN1+C2+C3)+Q＇3×D＇3＝Q3DN1+Q3(C2+C3)+Q＇3×D＇3，
wherein ,C3The natural decreasing rate of the old well in the third year after the oil field construction period is the difference value of the last year, C3Is equal to DN3Subtract DN2；
……
By analogy, the natural decreasing rate of the old well of the oil field is as follows when the ith year after the oil field construction period
Figure BDA0003020082180000032
Thus, the natural decline rate of the old well of the oil field is obtained as the formula (5):
Figure BDA0003020082180000041
wherein ,Q＇1The daily production level of a new well is proportional to the end of the last year in the first year after the construction period of the oil field; q1The daily production level of the old well is proportional to the last year of the first year after the oil field construction period; d1The natural decline rate of the first year after the construction period of the new well of the last year in the first year after the construction period of the oil field; dN1The natural decreasing rate of the old well in the first year after the oil field construction period; cjThe natural decreasing rate of the j-th old well after the oil field construction period is more than the difference value of the last yearAbsolute value, CjIs equal to DNiAnd DNi-1Absolute value of difference, j ═ 2, … …, i; diThe natural decline rate of the first year after the last new well construction period of the ith year after the oil field construction period; qiThe daily production level of a new well is proportional to the last year of the ith year after the construction period of the oil field;
wherein the new well is a newly built well every year; the old well is a well other than the new well; the pure old well is the old well of the last year.
Preferably, in the step (6), the natural decline rate of the next-year old-well is calculated by predicting the absolute value of the difference between the natural decline rate of the next-year old-well and the current-year difference by using an equal difference method, which is specifically as follows: utilizing natural degressive value D of the pure old well in the last three yearsNiSuppose that the natural decrement value of the pure old well is compared with the difference value C of the last yearjAnd predicting the difference value of the natural decline rate of the next-year old-well compared with the current year according to an equal difference method for the equal difference series, thereby calculating the natural decline rate of the next-year old-well.
Preferably, the historical production data in step (1) includes the basic monthly production of the old well, the monthly production days of the old well, the monthly well opening times of the new well, the monthly production days of the new well and the monthly production of the new well.
The invention has the advantages that:
the method for determining the natural decline rate of the base yield of the old well of the oil field can truly reflect the development effect, effectively release the yield of the old well, provide certain data support for subsequent development, production allocation and production planning, realize high-benefit development of the oil field and achieve the expected production capacity.
Detailed Description
Example 1
The extension oil field is provided with 12 oil production plants at present, namely a Wu-Dynasty oil production plant, a Shidan oil production plant, a fixed-edge oil production plant, a Jing-edge oil production plant, a Xingzuan oil production plant, a Zizhuan oil production plant, a Nanniwan oil production plant, a Baotan oil production plant, a Qili village oil production plant, a Xiuwan oil production plant, a Fuxian oil production plant and a Changshan oil production plant.
The oil field is an old oil area, and if 2016 is the first year after the construction period of the oil field, i is 1; the year 2017 is the second year after the construction period, and i is 2; the third year after the construction period is 2018, i is 3; 2019, the fourth year after the construction period, i is 4; the fifth year after the construction period in 2020, i is 5; and (3) calculating the natural decline rate of the basic yield of the old well in the 2021 year, wherein i is 6 in the sixth year after the construction period.
The invention is further described below by taking the example of calculating the natural decline rate of the base production of the old well in the oil field in 2021.
In 2021, the previous year is 2020, and the number of crescent wells, the crescent production of the crescent wells, the monthly production days of the crescent wells, the basic monthly production of the old wells, the number of crescent wells, the basic monthly production of the old wells, the monthly production days of the old wells, 2016-2019, the monthly production of the crescent wells and the monthly production days of the crescent wells are counted in 2020; see tables 1-6, tables 8-9. The data missing in the table of the present invention represents no production.
A method for determining the natural decline rate of the basic yield of an old well of an oil field comprises the following steps:
(1) and acquiring the historical production data of each oil field or each oil production plant in the oil field, wherein the historical production data comprises the basic monthly production of the old well, the monthly production days of the old well, the monthly well opening number of the new well, the monthly production days of the new well and the monthly production of the new well, and the historical production data is shown in tables 1-6 and tables 8-9.
(2) Calculating the new well daily output level q' of last yeari：
Taking 2021 as an example, the daily production level of the new well at the end of the year is the daily production level of the new well at the end of the year 2020, the data of 2020 is shown in Table 1, and the data is data of various oil production plants, so qiThe calculation is calculated according to the following formula:
q＇ifor the calibrated daily production level q' of the new well at the end of the last year of each oil production planti oil production plantThe sum of the total weight of the components,
wherein ,q＇i oil production plantThe new well single well daily output level at the end of the year is calibrated multiplied by the number of wells opened in 12 months,
the calibrated daily production level of the single well of the new well at the end of the year is 12 months of daily production level of the single well of the new well (11 months of daily production level of the single well of the new well-12 months of daily production level of the single well of the new well);
taking 1,2,3 … … in the ith year after the construction period;
the daily production level of the new well at the end of 2020 s for each oil plant was calculated as follows:
according to the data recorded in the table 1, in 2020, the average daily production level of a single well of a new well in 11 months in Wu oil production factory is 1.84t/d, and the number of open wells is 507; the daily production level of a single well of a new well in 12 months is 1.69/d, and the number of opened wells is 531;
according to the formula, the daily production level of the new well is 1.54/d
Then q6 WuqiThe new well single-well daily production level at the end of the year multiplied by 12 months is 818 t/d;
according to the same method, the annual terminal daily output level, q' of the new well of each oil production plant is calculated6 Shidan pill＝139t/d、q＇6 edge fixing＝722t/d、q＇6 Jing edge＝261t/d、q＇6 Almond＝115t/d、q＇6 son long＝303t/d、q＇6 pagoda＝168t/d、q＇6 southern mud bay＝143t/d、q＇6 Qilicun＝147t/d、q＇6 lower temple＝50t/d、q＇6 Fuxian county＝63t/d、q＇6 horizontal mountain0, the sum of the two is the annual terminal daily production level q ″ of a new well in an oil field6＝2929t/d；
The daily production level of the new well at the end of the last year in 2020 is the daily production level of the new well at the end of the last year in 2019, and the daily production level is calculated according to the same method and obtained according to the data in the table 4: q5＝3487t/d；
Data of 2015 + 2018 directly as oil field data, qiThe following formula is used for the calculation:
q＇ithe new well single well daily output level at the end of the year is calibrated multiplied by the number of wells opened in 12 months,
wherein the rated end-of-year single well daily output level of the new well is 12 months single well daily output level- (11 months single well daily output level of the new well-12 months single well daily output level), and the calculated q' is obtained according to the data in Table 64＝3572t/d；q＇3＝2786t/d；q＇2＝3491t/d；q＇1＝4338t/d。
(3) Calculating and calibrating daily output level q of old well at the end of last yeari：
The data in 2020, which are data of each oil production plant, are shown in table 2,
qidaily production level q of old well in last year end for calibration of each oil production planti oil production plantThe sum of the total weight of the components,
wherein ,
Figure BDA0003020082180000061
according to the table 2, the average daily production level of Wu Fang 11 months in 2020 is 6446t/d, and the average daily production level of Wu 12 months is 6430t/d, according to the formula:
Figure BDA0003020082180000062
the daily output level q of the old well at the end of the year is obtained by calculation through Wuqi 20206 Wuqi＝6422t/d；
According to the method, the annual terminal daily output level q of the old well of each oil production plant is calibrated in sequence6 Shidan pill＝5815t/d、q6 edge fixing＝4991t/d、q6 Jing edge＝2451t/d、q6 Almond＝2060t/d、q6 son long＝2000t/d、q6 pagoda＝1190t/d、q6 southern mud bay＝1171t/d、q6 Qilicun＝957t/d、q6 lower temple＝447t/d、q6 Fuxian county＝368t/d、q6 horizontal mountain366t/d, the sum of which is the annual end daily production level q of a new well in an oil field6＝28238t/d；
The daily production level of the old well at the end of the last year in 2020 is the daily production level of the old well at the end of the last year in 2019, and the calculation is directly carried out according to the table 3 according to the same calculation method, so that the following results are obtained: q. q.s5＝28044t/d；
The data of 2015-2018 is directly oil field data,
Figure BDA0003020082180000063
calculate q according to Table 54＝27599t/d；q3＝28343t/d；q2＝27614t/d；q1＝30168t/d。
(4) New well daily output level ratio Q' at the end of last yeariThe daily output level of the old well at the end of the last year accounts for Qi：
(41) Calculating year of yearDaily production level of the last oil field N: for the nominal daily yield level q' of the new well at the end of the last yeariAnd the calibrated daily output level q of the old well at the end of the last yeariThe sum, the calculation results are shown in Table 7;
(42) new well daily output level ratio Q' at the end of last yeari: for the nominal daily yield level q' of the new well at the end of the last yeariThe ratio of the daily output level N of the oil field at the end of the last year is calculated, and the calculation result is shown in a table 7;
(43) daily output level ratio Q of old well at last year of last yeari: for a calibrated daily output level q of the old well at the end of the last yeariThe ratio of the daily output level N of the oil field at the end of the last year is calculated, and the calculation result is shown in a table 7;
TABLE 7 statistical table of annual daily output levels of new and old wells in past years and ratio thereof
Figure BDA0003020082180000071
(5) Natural decrement rate D' of last year new welli
Natural decrement rate D' of last year well in first yeariThe natural decreasing rate of the first year after the last new well construction period of the ith year after the oil field construction period,
natural rate of decrease in the first year D' of the last year of 20205For the natural decreasing rate of the first year after the last new well construction period of the 5 th year after the oil field construction period, namely the natural decreasing rate of the first year after the new well construction period of 2019, the data of 2019 acquired in the step (1) are data of each oil production plant, which are shown in table 8, so that the first year after the new well construction period of 2019 is 2020, and the calculation is performed according to the following formula:
Figure BDA0003020082180000072
wherein the yield of the new well in the construction period when the time of year is full is the sum of the yields of the new wells in the construction period when the time of year is full of the oil plants in the construction period; the actual yield of the first year after the new well construction period is the sum of the actual yields of the first year after the new well construction period of each oil plant, and the yield of the new well construction period of each oil plant when the annual time rate is full is calculated according to the following formula:
Figure BDA0003020082180000073
according to the annual output and actual production days of the new well in the year 2019 of Wu & ltSUB & gt oil factory in the year 2019, the annual full-time rate-hour yield of the new well in the construction period of the Wu & ltSUB & gt oil factory in the year 2019 is calculated to be 289329.58 tons; the yield at the time of annual time-out rate of new well construction period in 2019 of other oil plants is calculated according to the same method and is shown in table 8,
the sum of the annual full-time rate and hour yield of new well construction periods in 2019 of each oil plant is the annual full-time rate and hour yield of the new well construction periods in the oil field, and the calculated annual full-time rate and hour yield of the new well construction periods in the oil field in 2019 is 1360550.48 tons;
according to the actual production of 1055900.40 tons of new wells in 2019 of the oil field in the first year after the construction period (2020), the natural decrement rate D' of the new wells in the first year in the 2020 is calculated according to a formula5＝(1360550.48-1055900.40)/1360550.48＝22.39％；
TABLE 82019 new well construction period current annual hourly rate production data sheet
Figure BDA0003020082180000081
The 2015-2018 data is directly oil field data, which is shown in Table 9, and is calculated according to the following formula,
Figure BDA0003020082180000082
Figure BDA0003020082180000083
to obtain the natural decline rate D' of the previous year of the 2016121.83%; natural decreasing rate D' of the first year of the last year of 2017222.19%; natural decreasing rate D' of the first year of the last year of 2018323.05 percent; new well in the last year of 2019Natural rate of decline in one year D422.48 percent;
natural rate of decrease D' of the first year of the previous year of 20216D' since actual production of the first year after the construction period of the new well of 2020 does not yet occur, for the natural decrement rate of the first year after the construction period of the new well of the last year of the sixth year of the oil field construction period, i.e., the natural decrement rate of the first year after the construction period of the new well of the 20206Data D' of the previous year of use5，D＇6Continue to use D522.39%;
table 92015-2018 New well construction period and the first year production data table after the year
Figure BDA0003020082180000091
(6) Calculating the natural decrement value D of the old well all the year roundNi：
The natural decline rate of the old well all the year round is calculated by using the formula of the decline rate of the ministry enacted, which is shown in the formula (4),
Figure BDA0003020082180000092
actual production of old well in this year-actual production of new well in last year after construction period
The natural reduction rate of the pure old well in 2020 is calculated as follows:
the pure old well in 2020 is the old well in 2019, so the daily output level of the pure old well in 2020 at the end of the year is the daily output level of the old well in 2019 at the end of the year, namely the daily output level q of the old well in 2020 at the end of the year5；
According to the data in table 2, the actual production of the 2020 old well is 1026.83 ten thousand tons, and according to the record in table 8, the actual production of the 2019 new well in 2020 is 105.59 ten thousand tons, so that the actual production of the 2020 old well in 2020 is 1026.8338-105.59 which is 921.24 ten thousand tons;
natural decreasing rate of pure old well in 2020DN5＝((28044×365÷10000)-921.24)/(28044×365÷10000)×100％＝10％；
According to the sameThe method is calculated according to the descriptions in table 3, table 5 and table 9 to obtain: dN1、DN2、DN3、DN411.25%, 11.14%, 10.87% and 10.43% respectively;
and (3) predicting the natural decline rate of the pure old well in 2021 year by using an arithmetic difference method, wherein the specific steps are as follows: natural decreasing rate of pure old well in 2020DN510.43 percent, and the natural decreasing rate D of the pure old well in 2019 years laterN4Has an absolute value of the difference of 0.43, i.e. C50.43, natural decreasing rate D of the pure old well in 2019N4Natural decreasing rate D of the pure old well in 2018 years laterN3Has an absolute value of the difference of 0.44, i.e. C40.44; predicting natural decline rate D of 2021-year old well according to arithmetic meanN6Natural decreasing rate of pure old well in 2020 of the last year DN5Absolute value of difference C6Therefore, D is calculated to be 0.42N6Is 9.58; the results of the calculations are shown in Table 10.
(7) The natural decline rate of the basic yield of the old well of the oil field is as follows:
since the oil zone is an old oil zone, according to equation (5),
Figure BDA0003020082180000101
calculating the natural decline rate D of the basic yield of the old well of the oil fieldiThe results are shown in Table 10;
2021, D6＝90.6％×11.25+9.4％×22.39-90.6％×(0.11+0.27+0.44+0.43+0.43)＝10.78％；
By the same token, it can be concluded that D is 2020511.73%, 2019D411.81%, 2018D311.96%, 2017D212.23%, 2016 year D112.35%, the results are given in table 10;
TABLE 102016-2021 Natural decrement Rate and other calculation results
Natural decrement ratio (%) 2016 (year) 2017 2018 years old 2019 2020 to 2021 year old
i 1 2 3 4 5 6
Oil field Di 12.58 12.38 11.96 11.81 11.37 10.78
Old well DNi 11.25 11.14 10.87 10.43 10 9.58
Old well DNiUpper annual difference value Cj 7 0.11 0.27 0.44 0.43 0.42
New year (first year) D'i 21.83 22.19 23.05 22.48 22.39 22.39
。
TABLE 12020 years New well monthly production data sheet
Figure BDA0003020082180000102
Figure BDA0003020082180000111
Figure BDA0003020082180000121
Table 22020 years old well monthly production data table
Figure BDA0003020082180000122
TABLE 32019 monthly production data sheet for old well of each factory
Figure BDA0003020082180000123
Figure BDA0003020082180000131
Monthly production data of new wells of each oil production plant in 42019 years
Figure BDA0003020082180000132
Figure BDA0003020082180000141
Figure BDA0003020082180000151
TABLE 52015-2018 monthly output statistical sheet for oil field old well
Figure BDA0003020082180000152
Table 62015-2018 oil field new well monthly production statistical table
Figure BDA0003020082180000153
Figure BDA0003020082180000161

Claims (3)

1. A method for determining the natural decline rate of the basic yield of an old well in an oil field is characterized by comprising the following steps: the method comprises the following steps:
(1) acquiring the annual output data of each oil field or each oil production plant in the oil field;
(2) calculating the new well daily output level of the last yearq＇i：
When the data acquired in the step (1) is the production data of the oil field in the past year,
q＇ithe single well daily output level at the end of the new well year is multiplied by the number of wells opened in 12 months,
the calibrated end-of-year daily production level of the single new well is 12 months daily production level of the single new well (11 months daily production level of the single new well-12 months daily production level of the single new well);
when the data acquired in the step (1) is the annual production data of each oil production plant in the oil field,
q＇ifor the calibrated daily production level q' of the new well at the end of the last year of each oil production planti oil production plantThe sum of the total weight of the components,
wherein ,q＇i oil production plantThe new well single well daily output level at the end of the year is calibrated multiplied by the number of wells opened in 12 months,
the calibrated daily production level of the single well of the new well at the end of the year is 12 months of daily production level of the single well of the new well (11 months of daily production level of the single well of the new well-12 months of daily production level of the single well of the new well);
taking 1,2,3 … … in the ith year after the oil field construction period;
(3) calculating and calibrating daily output level q of old well at the end of last yeari：
When the data acquired in the step (1) is the production data of the oil field in the past year,
Figure FDA0003020082170000011
when the data acquired in the step (1) is the annual production data of each oil production plant in the oil field,
qidaily production level q of old well in last year end for calibration of each oil production planti oil production plantThe sum of the total weight of the components,
wherein ,
Figure FDA0003020082170000012
(4) new well daily output level ratio Q' at the end of last yeariThe daily output level of the old well at the end of the last year accounts for Qi：
(41) Calculating the daily output level N of the oil field at the end of the last year: for the nominal daily yield level q' of the new well at the end of the last yeariAnd the calibrated daily output level q of the old well at the end of the last yeariSumming;
(42) new well daily output level ratio Q' at the end of last yeari: for the nominal daily yield level q' of the new well at the end of the last yeariThe oil field daily output level N accounts for the ratio of the oil field daily output level N at the end of the last year;
(43) daily output level ratio Q of old well at last year of last yeari: for a calibrated daily output level q of the old well at the end of the last yeariThe oil field daily output level N accounts for the ratio of the oil field daily output level N at the end of the last year;
(5) natural decrement rate D' of last year new welli：
Natural decrement rate D' of last year well in first yeariFor the natural rate of decline of the first year after the last new well construction period of the ith year after the oil field construction period, when the actual production of the first year after the new well construction period has not yet occurred, D ″iData of the last year is used;
wherein ,
when the data acquired in the step (1) is the production data of the oil field in the past year,
Figure FDA0003020082170000021
Figure FDA0003020082170000022
when the data acquired in the step (1) is the annual production data of each oil production plant in the oil field,
Figure FDA0003020082170000023
the yield of the new well in the construction period when the time is full is the sum of the yields of the new wells in the construction periods when the time is full of each oil production plant in the construction period; the actual yield of the first year after the new well construction period is the sum of the actual yields of the first year after the new well construction period of each oil production plant, and the yield of the new well construction period of the oil production plant when the annual time rate is full is calculated according to the following formula:
Figure FDA0003020082170000024
(6) calculating the natural degressive rate value D of the pure old wellNi：
Calculating the natural decline rate D of the old well all the year round by using the formula of the decline rate of the ministry enactment lawNiThe natural decline rate of the next-year old-well is calculated by predicting the absolute value of the difference between the natural decline rate of the next-year old-well and the current year difference by using an equal difference method according to a formula (4);
Figure FDA0003020082170000025
wherein the actual yield of the pure old well in the year is the actual yield of the old well in the year-the actual yield of the new well in the last year after the construction period;
(7) natural decline rate D of oil field old well basic yieldi：
Natural decline rate D of oil field old well basic yieldiWith reference to equation (5),
Figure FDA0003020082170000026
wherein ,Q＇1The daily production level of a new well is proportional to the end of the last year in the first year after the construction period of the oil field; q1The daily production level of the old well is proportional to the last year of the first year after the oil field construction period; d1The natural decline rate of the first year after the construction period of the new well of the last year in the first year after the construction period of the oil field; dN1The natural decreasing rate of the old well in the first year after the oil field construction period; cjThe absolute value of the natural decrement rate of the j-th old well after the oil field construction period is larger than the absolute value of the annual difference value CjIs equal to DNiAnd DNi-1Absolute value of difference, j ═ 2, … …, i; diThe natural decline rate of the first year after the last new well construction period of the ith year after the oil field construction period; qiThe daily production level of a new well is proportional to the last year of the ith year after the construction period of the oil field;
wherein the new well is a newly built well every year; the old well is a well other than the new well; the pure old well is the old well of the last year.
2. The method of determining the natural rate of decline of the base production of an old well in an oil field as claimed in claim 1 wherein:
and (6) predicting the natural decline rate of the next-year old-well by using an equal difference method to calculate the natural decline rate of the next-year old-well by using the absolute value of the difference value between the next-year old-well and the current year, wherein the method specifically comprises the following steps: utilizing natural degressive value D of the pure old well in the last three yearsNiSuppose that the natural decrement value of the pure old well is compared with the difference value C of the last yearjAnd predicting the difference value of the natural decline rate of the next-year old-well compared with the current year according to an equal difference method for the equal difference series, thereby calculating the natural decline rate of the next-year old-well.
3. The method of determining the natural rate of decline of the base production of an old well in an oil field as claimed in claim 1 wherein: the historical production data in the step (1) comprise the basic monthly production of the old well, the monthly production days of the old well, the monthly well opening number of the new well, the monthly production days of the new well and the monthly production of the new well.
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