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Method for driving crude oil out by microorgans in crude oil

A technology of endogenous microorganisms and microorganisms, which is applied in the direction of earthwork drilling, production fluids, wellbore/well components, etc., can solve the problems of reducing technology costs, microorganisms are difficult to adapt to the formation environment, etc., so as to improve efficiency, reduce costs, increase production Yield effect

Inactive Publication Date: 2003-06-18
OIL EXTRACTION TECH INST OF SINOPEC SHENGLI OILFIELD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a low-cost, practical and effective method for oil displacement using endogenous microorganisms in oil reservoirs. By adding microbial activators, the endogenous microorganisms in the oil reservoir are activated, so as to achieve the purpose of improving oil recovery with microorganisms ; Overcome the problem that microorganisms in conventional microbial oil recovery methods are difficult to adapt to the formation environment, save the steps of bacterial strain screening and bacterial liquid production, and reduce technical costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0011] Select an endogenous microorganism suitable for the block to do the oil displacement test. The temperature of this block is ≤80℃; the degree of salinity is ≤100000mg / L; the permeability is >50×10 -3 μm 2 Any reservoir or block in the Reservoirs or blocks with a temperature ≤70°C and long-term water injection development are more suitable for flooding with endogenous microorganisms. Firstly, the injection water and three oil wells were sampled for water chemical analysis and microbiological analysis.

[0012] project

Injecting water

A-1 Well 1

A-1 Well 2

A-1 Well 3

pH

7.0

7.5

7.5

7.2

DO (mg / L)

-

0.04

0.04

0.06

Na + +K +

(mg / L)

6092.7

7918.9

7633

7534.8

Ca 2+ (mg / L)

309.7

124.1

125.7

160.8

Mg 2+ (mg / L)

106.7

67.1

74.4 ...

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PUM

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Abstract

An oil displacing method using the internal microbes in oil reservoir for the water injection region features that the microbe activator determined by the microbe kinds in the oil reservoir is injected in the stratum for higher pertroleum output. Its advantages are high effect and low cost.

Description

technical field [0001] The invention belongs to an oil recovery method in the petroleum industry, in particular a method for oil displacement using endogenous microorganisms in oil reservoirs, which is suitable for use in oil reservoirs and blocks after long-term water injection development, and uses the original microorganisms in the oil reservoirs to improve oil production. The original microorganisms include: hydrocarbon oxidizing bacteria and anaerobic fermentation bacteria. technical background [0002] The oilfield development has gone through the stages of primary oil recovery and secondary oil recovery, and now it has entered the stage of tertiary oil recovery. The so-called primary oil recovery refers to the potential oil recovery of the reservoir. When the energy of the reservoir is exhausted, the energy of the primary oil recovery decreases accordingly. Water injection under pressure is the main method used in secondary oil recovery processes. Combined, primary ...

Claims

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Application Information

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IPC IPC(8): E21B43/22
Inventor 汪卫东李希明包木太魏斌宋永亭蒋焱陈勇鞠玉芹耿雪丽陈声
Owner OIL EXTRACTION TECH INST OF SINOPEC SHENGLI OILFIELD
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