CN111894569B - Reservoir protection effect evaluation method for conventional well repair operation of offshore oil well - Google Patents
Reservoir protection effect evaluation method for conventional well repair operation of offshore oil well Download PDFInfo
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- CN111894569B CN111894569B CN202010791521.9A CN202010791521A CN111894569B CN 111894569 B CN111894569 B CN 111894569B CN 202010791521 A CN202010791521 A CN 202010791521A CN 111894569 B CN111894569 B CN 111894569B
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Abstract
The invention discloses a method for evaluating the protection effect of a reservoir layer in conventional well workover operation of an offshore oil well, which comprises the steps of calculating a daily oil production index and a liquid production index under the condition of normal production 5 days before well workover operation, and calculating an average oil production index and a liquid production index; calculating a daily oil recovery index, a liquid recovery index, a recovery rate of the oil recovery index, and a recovery rate of the liquid recovery index from the first day after completion of well workover operation to 30 days after completion of the operation; according to the oil recovery index recovery rate and the liquid recovery index recovery rate after operation, respectively reaching oil recovery index recovery periods and liquid recovery periods corresponding to different percentages, and calculating corresponding oil recovery index recovery scores and liquid recovery index recovery scores; and calculating comprehensive evaluation scores of the reservoir protection effects of the conventional well repair operation of the offshore oil well, and grading the reservoir protection effects of the conventional well repair operation of the offshore oil well according to the scores. According to the oil recovery index and the recovery condition of the oil recovery index after operation, the invention can rapidly and accurately evaluate the reservoir protection effect of the conventional well repair operation of the offshore oil well.
Description
Technical Field
The invention relates to the technical field of conventional well repair operation of offshore oil wells, in particular to a reservoir protection effect evaluation method for conventional well repair operation of offshore oil wells.
Background
The conventional well repair measure operation of the offshore oil well is the work for relieving faults and improving the well conditions for recovering the normal production of the oil well, and is an important measure for improving the single well yield and the recovery ratio and prolonging the production period, and comprises pump detection operation, pump replacement operation, pipe column replacement operation and the like. During workover, if improper workover procedures and workover fluids are used, reservoir damage may occur, sometimes even resulting in a decrease in productivity after workover.
For the operation of the production increase measure, the operation effect can be judged by indexes such as oil increase in the initial stage of the operation and accumulated oil increase, and the conventional well workover operation is not aimed at oil increase, so that the method for evaluating the operation effect is not suitable for the operation of the production increase measure. The conventional well repair measure operation effect evaluation method adopts the recovery period and recovery rate to evaluate the conventional operation effect, but the method is interfered by various factors such as pump frequency, discharge capacity and the like, and cannot objectively reflect the actual effect of actual operation. In addition, for the method for evaluating the conventional well repair operation effect by adopting the skin coefficient obtained by well test, the well test has high cost and long time consumption, occupies the offshore platform operation resource, and is difficult to commonly apply.
Therefore, there is a great need to develop a method for evaluating the reservoir protection effect of conventional well workover operation of offshore oil wells, which can rapidly, reliably and inexpensively evaluate the reservoir protection effect of conventional well workover operation of offshore oil wells, and is beneficial to optimizing targeted reservoir protection working fluid and reservoir protection process.
Disclosure of Invention
In view of the above, the invention aims to provide the method for evaluating the reservoir protection effect of the conventional well repair operation of the offshore oil well, which can rapidly, reliably and inexpensively evaluate the reservoir protection effect of the conventional well repair operation of the offshore oil well, thereby being beneficial to optimizing the targeted reservoir protection working fluid and the reservoir protection process and having great production practice significance.
Therefore, the invention provides a method for evaluating the reservoir protection effect of conventional well repair operation of an offshore oil well, which comprises the following steps:
firstly, calculating a daily oil production index and a liquid production index under the condition of normal production for 5 days before well repair operation, and calculating an average oil production index and a liquid production index for 5 days;
calculating a daily oil production index and a liquid production index from the first day after completion of well workover operation to 30 days after completion of the operation;
thirdly, calculating the recovery rate of the oil recovery index from the first day after the well repair operation to 30 days after the operation is completed;
step four, calculating corresponding oil recovery index recovery scores and liquid recovery scores according to the oil recovery index recovery rate and the liquid recovery index recovery rate which respectively reach 70%, 80%, 90% and 100% of corresponding oil recovery index recovery periods and liquid recovery index recovery periods after operation;
and fifthly, calculating comprehensive evaluation scores of the reservoir protection effects of the conventional well repair operation of the offshore oil well, and grading the reservoir protection effects of the conventional well repair operation of the offshore oil well according to the scores.
Wherein, in the first step, the oil recovery index calculation method satisfies the formula:
wherein J is o Is the oil recovery index in cubic meters per megapascal days (m 3 /d·Mpa)，q o For daily oil recovery, the unit is cubic meters per day (m 3 /d), Δp is the pressure difference in megapascals (Mpa), p i Is the original pressure of the oil reservoir, the unit is megapascals (Mpa), p wf Is the bottom hole flow pressure in megapascals (Mpa).
In the first step, the calculation method of the liquid extraction index satisfies the formula:
wherein J is the liquid extraction index, and the unit is cubic meters per megapascal day (m 3 Per d.mpa), q is the daily liquid yield in cubic meters per day (m) 3 /d), Δp is the pressure difference in megapascals (Mpa), p i Is the original pressure of the oil reservoir, the unit is megapascals (Mpa), p wf Is the bottom hole flow pressure in megapascals (Mpa).
In the third step, the daily oil recovery index is calculated according to the following formula:
wherein R is oi I=1, 2,3, …,30,J oi for daily oil recovery index after work, J oa Is the average value of the daily oil production index under the condition of normal production in 5 days before operation.
In the third step, the daily liquid production index recovery rate calculation formula is as follows:
wherein R is i I=1, 2,3, …,30, j for daily recovery of fluid production index after work i Is the liquid sampling index of each day after operation, J a The average value of the daily liquid sampling index under the normal production condition of 5 days before operation is given.
In the fourth step, the oil recovery index recovery score and the recovery index recovery score scoring method under different recovery rates are shown in table 1:
table 1 recovery score for oil recovery index and recovery score scoring table for liquid recovery index
In the fifth step, the oil recovery index recovery total score E is calculated first to calculate the comprehensive evaluation score of the reservoir protection effect of the conventional well repair operation of the offshore oil well o Total score E for recovery of fluid production index f 。
Recovery of oil recovery index Total score E o The sum of recovery scores of the oil recovery indexes at 70%, 80%, 90% and 100% recovery rates is given by the following formula:
E o ＝∑E oi ；
in E oi The recovery scores were 70%, 80%, 90%, 100% recovery of the oil recovery.
Recovery total score E of liquid production index f 70 percent,The sum of recovery scores of the mining indexes under the recovery rates of 80%, 90% and 100% is as follows:
E f ＝∑E fi ；
in E fi The recovery scores of the mining indexes are 70%, 80%, 90% and 100% of the recovery rates of the mining indexes.
In the fifth step, the formula for calculating the comprehensive evaluation score E of the reservoir protection effect of the conventional well repair operation of the offshore oil well is as follows:
E＝E o ×0.7+E f ×0.3；
in the fifth step, the method for classifying the reservoir protection effect grades of the conventional well repair operation of the offshore oil well according to the comprehensive evaluation scores of the reservoir protection effects of the conventional well repair operation of the offshore oil well is shown in table 2:
table 2 grade classification table for reservoir protection effect of conventional well repair operation of offshore oil well
| Comprehensive evaluation score (E) | Job effect level |
| E≥90 | Has good effect |
| 75≤E<90 | Has good effect |
| 50≤E<75 | Effects are general |
| E<50 | Poor effect |
The method for evaluating the reservoir protection effect of the conventional well repair operation of the offshore oil well can rapidly and accurately evaluate the reservoir protection effect of the conventional well repair operation of the offshore oil well according to the oil production index and the recovery condition of the oil production index after the operation, and has guiding significance for optimization of reservoir protection working fluid and reservoir protection technology.
Drawings
Fig. 1 is a flow chart of the invention.
Detailed Description
In order to better understand the aspects of the present invention, the present invention will be described in further detail with reference to the drawings and embodiments.
Examples
Firstly, selecting a certain oil well for pumping inspection operation of the Bohai sea oil field, wherein the stratum static pressure is 11.2MPa, and the production data under the normal production condition 5 days before operation are shown in Table 3:
TABLE 3 production data under normal production conditions 5 days before the run
Calculating a daily oil production index and a liquid production index under the condition of normal production 5 days before well repair operation according to the production data, wherein the results are shown in Table 4;
TABLE 4 results of calculation of fluid production index and oil production index under normal production conditions 5 days before the operation
Calculating the average oil production index of 16.22m in 5 days according to the daily oil production index and the oil production index under the normal production condition of 5 days before workover treatment 3 /d.Mpa and liquid production index 64.93m 3 /d·Mpa。
Secondly, calculating a daily oil production index and a liquid production index from the first day after completion of well workover operation to 30 days after completion of the operation according to the production data, wherein the results are shown in Table 5;
thirdly, calculating the recovery rate of the oil recovery index and the recovery rate number of the liquid recovery index from the first day after completion of well workover to 30 days after completion of the well workover operation, wherein the results are shown in Table 5;
TABLE 5 results of calculation of recovery rate of fluid recovery/oil recovery index and fluid recovery/oil recovery index under normal production condition 30 days after operation
Fourthly, calculating corresponding oil recovery index recovery scores and liquid recovery scores according to oil recovery index recovery periods and liquid recovery index recovery periods which are respectively 70%, 80%, 90% and 100% and correspond to the oil recovery index recovery rates and the liquid recovery index recovery rates after operation, wherein the results are shown in Table 6;
table 6 working fluid/oil recovery index recovery period and scoring results
And fifthly, calculating the comprehensive evaluation score of the reservoir protection effect of the conventional well repair operation of the offshore oil well according to the oil production index recovery score and the oil production index recovery score to be 82.5, and grading the reservoir protection effect of the conventional well repair operation of the offshore oil well according to the score to obtain a better effect.
Those of ordinary skill in the art will appreciate that the embodiments described herein are intended to aid the reader in understanding the practice of the invention and that the scope of the invention is not limited to such specific statements and embodiments. Those of ordinary skill in the art can make various other specific modifications and combinations from the teachings of the present disclosure without departing from the spirit thereof, and such modifications and combinations remain within the scope of the present disclosure.
Claims (1)
1. The method for evaluating the reservoir protection effect of the conventional well repair operation of the offshore oil well is characterized by comprising the following steps of:
firstly, calculating a daily oil production index and a liquid production index under the condition of normal production for 5 days before well repair operation, and calculating an average oil production index and a liquid production index for 5 days;
the oil extraction index calculation method satisfies the formula:
wherein J is o Is oil production index, unit is cubic meter per megapascal day, m 3 /d·Mpa；
q o The unit is cubic meter of oil per day, m 3 /d；
Δp is the differential pressure produced in megapascals, mpa;
p i the original pressure of the oil reservoir is expressed in megapascals and Mpa;
p wf is the bottom hole flow pressure, the unit is megapascals, mpa;
the calculation method of the liquid extraction index meets the following formula:
wherein J is the liquid extraction index, and the unit is cubic meters per megapascal day, m 3 /d·Mpa；
q is daily liquid sampling amount, the unit is cubic meter per day, m 3 /d；
Δp is the differential pressure produced in megapascals, mpa;
p i the original pressure of the oil reservoir is expressed in megapascals and Mpa;
p wf is the bottom hole flow pressure, the unit is megapascals, mpa;
calculating a daily oil production index and a liquid production index from the first day after completion of well workover operation to 30 days after completion of the operation;
thirdly, calculating the recovery rate of the oil recovery index from the first day after the well repair operation to 30 days after the operation is completed;
the daily oil recovery index is calculated as:
wherein R is oi I=1, 2,3, …,30, j for daily recovery of oil recovery after work oi For daily oil recovery index after work, J oa Average value of daily oil extraction index under normal production condition 5 days before operation;
the daily liquid production index recovery rate calculation formula is as follows:
wherein R is i I=1, 2,3, …,30, j for daily recovery of fluid production index after work i Is the liquid sampling index of each day after operation, J a The average value of the daily liquid sampling index under the normal production condition 5 days before operation;
step four, calculating corresponding oil recovery index recovery scores and liquid recovery scores according to the oil recovery index recovery rate and the liquid recovery index recovery rate which respectively reach 70%, 80%, 90% and 100% of corresponding oil recovery index recovery periods and liquid recovery index recovery periods after operation;
fifthly, calculating comprehensive evaluation scores of the reservoir protection effects of the conventional well repair operation of the offshore oil well, and grading the reservoir protection effects of the conventional well repair operation of the offshore oil well according to the scores;
the comprehensive evaluation score of the reservoir protection effect of the conventional well repair operation of the offshore oil well is calculated by firstly calculating the recovery total score E of the oil production index o Total score E for recovery of fluid production index f ；
Recovery of oil recovery index Total score E o The sum of recovery scores of the oil recovery indexes at 70%, 80%, 90% and 100% recovery rates is given by the following formula:
E o ＝∑E oi
in E oi Recovery scores for oil recovery at 70%, 80%, 90%, 100% recovery rate for oil recovery;
recovery total score E of liquid production index f The sum of recovery scores of the mining indexes at 70%, 80%, 90% and 100% recovery rates of the mining indexes is as follows:
E f ＝ΣE fi
in E fi Recovery scores of the mining indexes at 70%, 80%, 90% and 100% recovery rates of the mining indexes;
the formula for calculating the comprehensive evaluation score E of the reservoir protection effect of the conventional well repair operation of the offshore oil well is as follows:
E＝E o ×0.7+E f ×0.3。
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| US20120095733A1 (en) * | 2010-06-02 | 2012-04-19 | Schlumberger Technology Corporation | Methods, systems, apparatuses, and computer-readable mediums for integrated production optimization |
| CN106520096B (en) * | 2016-10-28 | 2019-10-08 | 西南石油大学 | A kind of well killing fluid and preparation method thereof, application |
| CN110344786B (en) * | 2019-07-03 | 2021-07-27 | 中海石油(中国)有限公司 | Method for evaluating effect of yield increasing measures of self-blowing oil well based on nozzle flow law |
| CN110956388B (en) * | 2019-11-28 | 2023-04-07 | 中国石油大学(华东) | Method for generating yield increasing scheme of offshore oil and gas reservoir |
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| WO2010062710A1 (en) * | 2008-11-03 | 2010-06-03 | Saudi Arabian Oil Company | Three dimensional well block radius determiner machine and related computer implemented methods and program products |
| CN109083641A (en) * | 2018-10-15 | 2018-12-25 | 西南石油大学 | Measure job execution effect evaluation method in a kind of underground workover treatment |
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