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Method for improving oil well production through microorganism single well processing

A microbial and well treatment technology, applied in wellbore/well components, chemical instruments and methods, earth-moving drilling and production, etc., can solve the problems of limited wellbore action, shut-down or well trip, oil well load and current increase, etc. The effect of high input-output ratio, wide application range and long validity period

Inactive Publication Date: 2016-06-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this invention is that the injection of microorganisms can only act on the oil layer in the near-well zone of the oil well, but has a limited effect on the wellbore of the oil well. Viscosity increases, which can easily lead to wellbore plugging, well load and current increase, resulting in well shutdown or well trip
The patent name is "A Method for Microbial Wax Removal and Prevention in Mechanized Wells", and the patent number is "ZL201110215056.5". The injected compound bacteria have a limited range of action and only act on the wellbore of the oil well. They can only play the role of clearing and preventing wax in the wellbore, reducing the load of the oil well and reducing the hot cleaning cycle of the oil well, but cannot increase the production of the oil well.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] There are 3 block A oil wells in the Hekou Oil Production Plant of Shengli Oilfield. The reservoir temperature of this oil well is 65°C, the formation water salinity is 9800mg / L, and the formation permeability is 1200×10 -3 μm 2 , The surface crude oil viscosity is 2500mPa s, the thickness of the oil layer is 15m, and the porosity is 0.34. The daily liquid production of this oil well is 25m 3 , water content 96.2%, daily oil 0.95t, hot wash cycle is 20d, and average load is 28.2kN, implements the present invention to this well, concrete steps are as follows:

[0044] (1) Screening of test wells

[0045] The reservoir temperature of the test oil well is 100×10 -3 μm 2 , Ground crude oil viscosity <5000mPa·s, in line with the screening criteria of the present invention.

[0046] (2) Determination of functional microorganisms and their nutrients

[0047] The functional microorganisms treated in the near wellbore zone of the oil well are Bacillus brevius, and the bacte...

Embodiment 2

[0071] Well C in Block Ng3 in Gudao Zhongyi of Shengli Oilfield, the reservoir temperature of this oil well is 70℃, the salinity of formation water is 15600mg / L, and the formation permeability is 2500×10 -3 μm 2 , The viscosity of surface crude oil is 4800mPa s, the thickness of the oil layer is 32m, and the porosity is 0.38. 3 , water content 98.5%, daily oil 0.6t, hot wash cycle is 30d, and average load is 105kN, implements the present invention to this well, concrete steps are as follows:

[0072] (1) Screening of test wells

[0073] The reservoir temperature of the test oil well is 100×10 -3 μm 2 , Ground crude oil viscosity <5000mPa·s, in line with the screening criteria of the present invention.

[0074] (2) Determination of functional microorganisms and their nutrients

[0075] The functional microorganisms treated in the near wellbore zone of the oil well are Bacillus cereus, and the bacterial concentration is greater than 10 8 each / mL, nutrients are corn steep l...

Embodiment 3

[0099] Shengli Oilfield Hekou Oil Production Plant Luo 801 block E oil well, the reservoir temperature of this oil well is 78 ℃, formation water salinity is 12500mg / L, formation permeability is 1700×10 -3 μm 2 , The viscosity of surface crude oil is 3200mPa s, the thickness of the oil layer is 24m, and the porosity is 0.35. 3 , water content 95.8%, daily oil 2.0t, hot wash cycle is 25d, and average load is 97.5kN, implements the present invention to this well, concrete steps are as follows:

[0100] (1) Screening of test wells

[0101] The reservoir temperature of the test oil well is 100×10 -3 μm 2 , Ground crude oil viscosity <5000mPa·s, in line with the screening criteria of the present invention.

[0102] (2) Determination of functional microorganisms and their nutrients

[0103] The functional microorganisms treated in the near wellbore zone of the oil well are Bacillus brevius, and the bacterial concentration is greater than 10 8 each / mL, nutrients are corn steep l...

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Abstract

The invention discloses a method for improving oil well production through microorganism single well processing and belongs to the technical field of tertiary oil recovery. The method for improving oil well production through microorganism single well processing is characterized in that the method comprises the following steps that 1, a test oil well is screened; 2, functional microorganisms and nutrients of the functional microorganisms are determined; 3, the injection volume of the functional microorganisms and the injection volume of the nutrients of the functional microorganisms are determined; and 4, field testing is conducted. The functional microorganisms are injected into the immediate vicinity and a wellbore of the oil well, and the purpose of improving the oil well production is achieved by using the comprehensive effect of the functional microorganisms and metabolites of the functional microorganisms on the immediate vicinity and the wellbore of the oil well. The method for improving the oil well production through microorganism single well processing has the characteristics that the method is wide in action range and capable of acting on the oil layer of the immediate vicinity of the oil well and also acting on the wellbore of the oil well; the oil pool application range is wide, and the method is suitable for both a thickened oil well and a wax-bearing oil well; not only can the oil well production well be improved, but also hot washing of the oil well can be reduced, the using amount of an anti-wax remover is decreased, and the electric current is saved. The method is capable of achieving energy saving and environment protecting, low in cost, long in validity period and high in input-output ratio.

Description

technical field [0001] The invention belongs to the technical field of tertiary oil recovery, and in particular relates to a method for improving oil well production through microbial single well treatment. Background technique [0002] Microbial single-well treatment refers to the injection and screening of functional microorganisms into production wells. Through the function of functional microorganisms 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 oil well production. Microbial single well treatment has the characteristics of less investment on the ground, 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. Microbial single well treatment can be classified into ...

Claims

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Application Information

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IPC IPC(8): E21B43/22C09K8/582
Inventor 李希明孙刚正宋欣王静潘永强王刚徐闯徐登霆巴燕谭晓明曹功泽张守献
Owner CHINA PETROLEUM & CHEM CORP
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