Method for displacing oil by using microbial in-situ microemulsion system

A technology of microorganisms and microbial activators, which is applied in the field of oil displacement using microbial in-situ microemulsion system, can solve the problems of limited scope of microemulsion oil displacement technology, reducing the interaction efficiency between the system and crude oil, and the influence of the degree of crude oil recovery. Achieve good field test results, save chemical surfactants and co-surfactants, and have strong pertinence and reliability.

Pending Publication Date: 2022-05-10
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (1) The microemulsion flooding system is prepared on the ground by chemical methods, and then continuously injected into the reservoir for oil displacement, the injection volume is large and the cost is high;
[0006] (2) Due to the continuous adsorption retention and dilution of the microemulsion flooding system during the reservoir migration process, the interaction efficiency between the system and crude oil is reduced;
[0007] (3) After the microemulsion flooding system reacts with crude oil, the emulsification is serious, and there is a problem of difficulty in subsequent demulsification;
[0008] (4) The microemulsion flooding technology has a limited sweep range in the reservoir, which affects the degree of enhanced oil recovery in actual field applications

Method used

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  • Method for displacing oil by using microbial in-situ microemulsion system
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  • Method for displacing oil by using microbial in-situ microemulsion system

Examples

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Effect test

Embodiment 1

[0058] (1) Test block screening

[0059] Test block A: Reservoir temperature 51°C, crude oil viscosity 760mPa.s, formation water salinity 981mg / L, permeability 1200×10 -3 μm 2 , the concentration in the formation water of test block A is 8.0×10 2 individual / mL Bacillus (surfactant-producing microorganisms); the formation water in test block A still has a concentration of 3.5×10 2 Individual / mL Enterobacteriaceae (surfactant-producing microorganisms), so test block A complies with the oil reservoir screening criteria of the present invention.

[0060] (2) Surfactant-producing microbial activator system screening

[0061] Take 100mL of formation water in the test block A of the area and place it in a culture bottle, and then add rapeseed oil (carbon source), ammonium nitrate (nitrogen source) and dipotassium hydrogen phosphate in the surfactant microbial activator system to the culture bottle (Phosphorus source), static culture at 51°C for 10 days, using orthogonal experimen...

Embodiment 2

[0109] (1) Test block screening

[0110] Test block B: Reservoir temperature 62°C, crude oil viscosity 1260mPa.s, formation water salinity 1581mg / L, permeability 980×10 -3 μm 2 , the concentration in the formation water of test block B is 2.8×10 2 individual / mL Rhodococcus (surfactant-producing microorganisms), the concentration is 5.2×10 2 Dietzella (surfactant-producing microorganisms) per mL; the concentration of 3.6×10 2 Individual / mL of Lactobacillus (surfactant-producing microorganisms), so the test block B meets the oil reservoir screening criteria of the present invention.

[0111] (2) Surfactant-producing microbial activator system screening

[0112] Take 150mL of formation water from test block B and place it in a culture bottle, then add soybean oil (carbon source), sodium glutamate (nitrogen source), and phosphoric acid dodecahydrate in the surfactant microbial activator system to the culture bottle Sodium hydrogen disodium (phosphorus source) was cultured sta...

Embodiment 3

[0159] (1) Test block screening

[0160] Test block F: Reservoir temperature 72°C, crude oil viscosity 1586mPa.s, formation water salinity 3327mg / L, permeability 2270×10 -3 μm 2 , the concentration in the formation water of test block F is 1.0×10 2 Individual / mL Pseudomonas (surfactant-producing microorganisms), the concentration is 3.0×10 2 individual / mL Rhodococcus (surfactant-producing microorganisms); the concentration of 2.0×10 2 Individual / mL lactobacilli (microsurfactant-producing microorganisms), the test block F meets the oil reservoir screening criteria of the present invention.

[0161] (2) Surfactant-producing microbial activator system screening

[0162] Take 50mL of formation water from test block F and place it in a petri dish, then add rapeseed oil (carbon source), sodium nitrate (nitrogen source), hydrogen phosphate dodecahydrate in the surfactant microbial activator system to the petri dish Disodium (phosphorus source) was cultured statically at 72°C for...

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Abstract

The invention discloses a method for displacing oil by using a microbial in-situ microemulsion system. The method comprises the following steps: (1) screening a test oil reservoir; (2) screening a microbial activator system for producing the surfactant; (3) screening a microbial activator system for producing the cosurfactant; (4) determining an on-site injection process; and (5) performing field test and evaluating the field test effect. Compared with the prior art, the method for displacing oil by using the microorganism in-situ microemulsion system has the following advantages and beneficial effects that (1) the oil reservoir application range is wide; (2) the implementation process is simple, and the pertinence and the reliability are high; (3) the microbial emulsified crude oil has dual effects; (4) the contact area of the biosurfactant and the crude oil is increased, a large number of chemical surfactants and cosurfactants are effectively saved, the investment cost is low, the field test effect is good, the input-output ratio is greater than 1: 5, and the recovery rate gt is increased; 30%.

Description

technical field [0001] The invention belongs to the technical field of tertiary oil recovery, and in particular relates to a method for oil displacement by using a microorganism in-situ microemulsion system. Background technique [0002] With the increase of global demand for energy, improving the oil recovery rate of oil fields has become one of the research hotspots. Oilfields usually use water flooding to produce oil, but after water flooding, the oil layer still contains about 90% of the oil that cannot be effectively exploited by conventional oil flooding techniques. [0003] In recent years, microemulsion flooding technology has developed rapidly and has shown broad application prospects in tertiary oil recovery. Compared with surfactant flooding, microemulsion can further reduce the interfacial tension of oil and water, and has a good effect of solubilizing crude oil. It can also significantly reduce the viscosity of crude oil, increase its fluidity, and make the cru...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/22C12N1/20C12N1/02C12R1/38C12R1/07C12R1/15C12R1/01C12R1/225C12R1/145
CPCE21B43/16C12N1/20C12N1/02
Inventor 李彩风李阳曹嫣镔高光军曹功泽刘涛耿雪丽陈琼瑶丁明山赵润林
Owner CHINA PETROLEUM & CHEM CORP
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