Method for enhancing recovery efficiency of oil reservoir driven by stratal microorganisms

A technology of endogenous microorganisms and recovery rate, applied in the directions of microorganism-based methods, biochemical equipment and methods, microorganisms, etc., can solve the problems of separate injection of activator systems, affecting the effect, difficulty, etc., to achieve good effect and price. Inexpensive, EOR

Inactive Publication Date: 2017-08-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage of this method is that usually the same oil layer corresponds to multiple water injection wells or the same water injection well corresponds to multiple oil layers with different permeability, and it is difficult to ensure that the activator systems of high, medium and low permeability oil layers are respectively injected into the corresponding oil layers , therefore, to a certain extent, it affects the field test results

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] In a block G of Shengli Oilfield, the reservoir temperature is 80°C and the permeability is 500×10 -3 μm 2 , crude oil viscosity 1280mPa.s, formation water salinity 12568mg / L, water content 95.2%, output degree 31.2%, pore volume 5.0×10 5 m 3 , water injection speed 100m 3 / d; the concentration of Pseudomonas bacteria in the output liquid is 1.0×10 3 Individual / ml, Geobacillus concentration 5.0×10 2 individual / ml, concentration of methanogenic bacteria 2.1×10 3 pieces / ml. Implementing the concrete implementation steps of the present invention in this block is:

[0036] (1) Screening of test reservoirs

[0037] The reservoir temperature of test reservoir G is 80℃, and the permeability is 500×10 -3 μm 2 , crude oil viscosity 1280mPa.s, formation water salinity 12568mg / L, water content 95.2%, output level 31.2%; Pseudomonas concentration in the output fluid 1.0×10 3 Individual / ml, Geobacillus concentration 5.0×10 2 individual / ml, concentration of methanogenic ba...

Embodiment 2

[0054] In a block H of Shengli Oilfield, the reservoir temperature is 65°C and the permeability is 850×10 -3 μm 2 , crude oil viscosity 985mPa.s, formation water salinity 32560mg / L, water cut 93.5%, output 28.6%, pore volume 9.0×10 5 m 3 , water injection speed 90m 3 / d; the concentration of Acinetobacter bacteria in the output liquid is 2.1×10 3 Individual / ml, Bacillus subtilis concentration 3.5×10 2 Individual / ml, Bacillus aerogenes concentration 1.0×10 3 pieces / ml. Implementing the concrete implementation steps of the present invention in this block is:

[0055] (1) Screening of test reservoirs

[0056] The reservoir temperature of test reservoir H is 65°C and the permeability is 850×10 -3 μm 2 , crude oil viscosity 985mPa.s, formation water salinity 32560mg / L, water content 93.5%, output level 28.6%; the concentration of Acinetobacter bacteria in the output liquid is 2.1×10 3 Individual / ml, Bacillus subtilis concentration 3.5×10 2 Individual / ml, Bacillus aerogen...

Embodiment 3

[0073] In a block L of Shengli Oilfield, the reservoir temperature is 85°C and the permeability is 1200×10 -3 μm 2 , crude oil viscosity 1952mPa.s, formation water salinity 27856mg / L, water cut 97.3%, output 32.0%, pore volume 7.5×10 5 m 3 , water injection speed 120m 3 / d; the concentration of Pseudomonas bacteria in the output liquid is 5.0×10 2 unit / ml, Geobacillus concentration 2.0×10 3 individual / ml, concentration of methanogenic bacteria 2.5×10 3 pieces / ml. Implementing the concrete implementation steps of the present invention in this block is:

[0074] (1) Screening of test reservoirs

[0075] The reservoir temperature of the test reservoir L is 85°C and the permeability is 1200×10 -3 μm 2 , crude oil viscosity 1952mPa.s, formation water salinity 27856mg / L, water content 97.3%, output level 32.0%; Pseudomonas bacteria concentration in the output fluid 5.0×10 2 unit / ml, Geobacillus concentration 2.0×10 3 individual / ml, concentration of methanogenic bacteria 2...

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Abstract

The invention discloses a method for enhancing the recovery efficiency of an oil reservoir driven by stratal microorganisms, and belongs to the technical field of microorganism oil recovery. The method specifically comprises the following steps of screening of the experimental oil reservoir; an activation phase of hydrocarbon-oxidizing functional bacteria; an activation phase of crude-oil-emulsifying functional bacteria; an activation phase of gas-producing functional bacteria; and an evaluation phase of a field experimental effect. According to the method for enhancing the recovery efficiency of the oil reservoir driven by the stratal microorganisms, activation agents adopted by the method are wide in sources and low in price and do not damage stratums; the method has the characteristics that the technology is simple, the pertinence and the maneuverability are high, and the field experimental effect is good; and the recovery efficiency is enhanced by more than 15.0% by a field experiment, so the method can be widely applied to field experiments enhancing the recovery efficiency of oil reservoirs.

Description

technical field [0001] The invention belongs to the technical field of microbial oil recovery, and in particular relates to a method for improving the recovery rate of endogenous microbial flooding reservoirs. Background technique [0002] Microbial oil recovery refers to the comprehensive action of microorganisms and their metabolites with reservoir rocks and fluids to improve the oil-water mobility ratio, thereby achieving the purpose of enhancing oil recovery. Microbial oil recovery technology has the advantages of low investment cost, no pollution to the environment and a wide range of reservoir adaptation, so it has broad field application prospects. Microbial oil recovery is divided into two types: endogenous microbial oil recovery and exogenous microbial oil recovery according to the source of microorganisms. Among them, the endogenous microbial oil recovery technology injects activators into the oil reservoir to activate the endogenous microorganisms in the oil reser...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/22C12N1/20C12R1/38C12R1/01C12R1/10C12R1/125C09K8/58
CPCE21B43/16C09K8/58C12N1/20
Inventor 曹嫣镔郭辽原宋永亭曹功泽郭慧段传慧冯云吴晓玲刘涛汤晓东高光军
Owner CHINA PETROLEUM & CHEM CORP
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