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Method for increasing oil well yield by endogenous microbial huff and puff

A technology of endogenous microorganisms and oil wells, which is applied in the field of increasing oil well production by endogenous microorganism throughput, can solve the problems of poor oil increase effect of test oil wells, small activator sweep volume, uneven activator injection, etc., and is conducive to field promotion Easy to apply, low cost, and long-term effect

Active Publication Date: 2020-03-31
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, the present invention solves the problem of slow production of the oil well due to the shut-down of the test oil well huff and puff; The problem of poor oil stimulation effect of oil well

Method used

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  • Method for increasing oil well yield by endogenous microbial huff and puff
  • Method for increasing oil well yield by endogenous microbial huff and puff
  • Method for increasing oil well yield by endogenous microbial huff and puff

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Shengli Oilfield Xianhe Oil Production Plant Test Well X 5 , the reservoir temperature of the oil well is 75°C, the viscosity of crude oil is 850mPa.s, and the salinity of formation water is 12563mg / L. Before the test, the water content of the oil well is 97.5%, and the daily oil production is 2.3t; 5 1 、X 5 2 、X 5 3 , the parameters of each oil layer are shown in Table 1; the oil well has a pipe string for layered production. Utilize the method of the present invention to carry out field test to improve the output of oil well, concrete steps are as follows:

[0033] (1) Screening of test wells

[0034] Test WellsX 5 The number of oil layers is 3, the reservoir temperature of the oil well is 75°C, and the oil well has a pipe string for layered production. The present invention can be implemented if the oil well screening conditions of the present invention are met.

[0035] (2) Determination of the layered huff and puff technology of test oil wells

[0036] Th...

Embodiment 2

[0064] Shengli Oilfield Xianhe Oil Production Plant Test Well X 8 , the reservoir temperature of the oil well is 70°C, the viscosity of crude oil is 1265mPa.s, the salinity of formation water is 21632mg / L, the water content of the oil well is 98.0% before the test, and the daily oil production is 1.5t; 8 1 、X 8 2 、X 8 3 , the parameters of each oil layer are shown in Table 4; the oil well has a string for layered production. Utilize the method of the present invention to carry out field test to improve the output of oil well, concrete steps are as follows:

[0065] (1) Screening of test wells

[0066] Test WellsX 8 The number of oil layers is 3, the reservoir temperature of the oil well is 70°C, and the oil well has a pipe string for layered production. The present invention can be implemented if the oil well screening conditions of the present invention are met.

[0067] (2) Determination of the layered huff and puff technology of test oil wells

[0068] The determi...

Embodiment 3

[0096] Shengli Oilfield Gudao Oil Production Plant Test Well G 3 , the reservoir temperature of the oil well is 67°C, the viscosity of crude oil is 1562mPa.s, the salinity of formation water is 25683mg / L, the water content of the oil well is 97.0% before the test, and the daily oil production is 2.5t; 3 1 , G 3 2 , the parameters of each oil layer are shown in Table 7; the oil well has a pipe string for layered production. Utilize the method of the present invention to carry out field test to improve the output of oil well, concrete steps are as follows:

[0097] (1) Screening of test wells

[0098] Test well G 3 The number of oil layers is 2, the reservoir temperature of the oil well is 67°C, and the oil well has a pipe string for layered production. The present invention can be implemented if the oil well screening conditions of the present invention are met.

[0099] (2) Determination of the layered huff and puff technology of test oil wells

[0100] The determinati...

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Abstract

The invention belongs to the technical field of microbial enhanced oil recovery, and particularly relates to a method for increasing an oil well yield by endogenous microbial huff and puff. The methodcomprises the following steps: screening a test well group; determining a layered huff and puff process of a test oil well, specifically including determination on a layered huff and puff sequence ofthe test oil well, determination on oil-layer activator injection volume and injection speed of the test oil well, and determination on oil-layer sealing culture time of the test oil well; and finally performing field conduct and effect evaluation. The method solves the oil well low-yield problem caused by huff and puff stop of the test oil well, and also solves the problem that the test oil welloil-increasing effect is not good as activator sweeping volume is small as a result of uneven activator injection into oil layers in a test oil well huff and puff processing process. Meanwhile, the method has the advantages of a high input-output ratio, a long term of validity and good field test effect, and can be widely applied to the yield increasing process of the oil well.

Description

technical field [0001] The invention belongs to the technical field of microbial oil flooding, and in particular relates to a method for improving oil well production by endogenous microbial throughput. Background technique [0002] Microbial single well huff and puff refers to the injection and screening of specific bacteria or activators in the production well. Through the action of the bacteria themselves and their metabolites, the wellbore and near-well formations are treated to improve the physical properties of crude oil, reduce the flow resistance of crude oil, and increase the production of oil wells. . Microbial single well huff and puff has the characteristics of less ground investment, simple operation, and quick results. It can especially improve the physical properties of crude oil, reduce the flow resistance of crude oil, and improve the efficiency of crude oil production in the wellbore of oil wells and near wells. [0003] The patent name "microbial single w...

Claims

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Application Information

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IPC IPC(8): E21B43/22E21B43/14
CPCE21B43/14E21B43/16
Inventor 汪卫东孙刚正杨元亮冯云孙立柱谭晓明丁明山吴晓玲巴燕曹嫣镔
Owner CHINA PETROLEUM & CHEM CORP