Method for improving recovery efficiency by regulating and controlling microbial flooding oil reservoir

A microbial oil flooding and recovery technology, applied in chemical instruments and methods, production fluids, earth drilling and production, etc., can solve problems such as poor pertinence and effectiveness, poor field test results, neglect of detection, etc., and achieve low control costs , clear control ideas, pertinence and operability

Pending Publication Date: 2022-05-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In summary, all the regulation in the prior art ignores the detection of the concentration of the activator and the small molecule acid in the intermediary link, resulting in poor pertinence and effectiveness of the regulation, and the process is complicated, the cycle is long and the field test effect is poor

Method used

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  • Method for improving recovery efficiency by regulating and controlling microbial flooding oil reservoir
  • Method for improving recovery efficiency by regulating and controlling microbial flooding oil reservoir
  • Method for improving recovery efficiency by regulating and controlling microbial flooding oil reservoir

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] General situation of test block G of an oil production plant in Shengli Oilfield: the reservoir temperature is 65°C, and the permeability is 620×10 -3 μm 2 , formation water salinity 10500mg / L, porosity 28%, crude oil viscosity 1200mPa·s, comprehensive water cut 93.0%. After laboratory test evaluation, this block is suitable for endogenous microbial flooding. The optimized activator formula is glucose concentration 5wt%, beef extract concentration 0.3wt%, dipotassium hydrogen phosphate concentration 0.05wt%. 2 injection wells, 6 oil wells, geological reserves 6.62×10 5 tons, the pore volume is 2.0×10 6 m 3 .

[0073] Utilize the method of the present invention to monitor the produced liquid in the microbial flooding process and make adjustments in time to further improve the oil recovery. The specific steps are as follows:

[0074] (1) Determination of testing indicators and plans for test reservoirs

[0075] The detection indicators of the test block G are the c...

Embodiment 2

[0097] General situation of test block H of an oil production plant in Shengli Oilfield: Reservoir temperature is 86°C, permeability is 310×10 -3 μm 2 , formation water salinity 7800mg / L, porosity 23.6%, crude oil viscosity 800mPa·s, comprehensive water cut 68.0%. After laboratory test evaluation, this block is suitable for endogenous microbial flooding. The optimized activator formula is 4.5% glycerin, 0.25% peptone (nitrogen source) and 0.05% diammonium hydrogen phosphate. 3 injection wells, 12 oil wells, geological reserves 1.32×10 6 tons, pore volume 7.2×10 6 m 3 .

[0098] Utilize the method of the present invention to monitor the produced liquid in the microbial flooding process and make adjustments in time to further improve the oil recovery. The specific steps are as follows:

[0099] (1) Determination of testing indicators and plans for test reservoirs

[0100] The detection indicators of test block H include acetic acid concentration A, methanogen concentratio...

Embodiment 3

[0124] General situation of test block K of an oil production plant in Shengli Oilfield: the reservoir temperature is 93°C, and the permeability is 360×10 -3 μm 2 , formation water salinity 10500mg / L, porosity 26.0%, crude oil viscosity 1200mPa·s, comprehensive water cut 97.0%. After laboratory test evaluation, this block is suitable for endogenous microbial flooding. The optimized activator formula is 5% of corn dextrin (carbon source), 0.3% of sodium nitrate (nitrogen source), and 0.1% of dipotassium hydrogen phosphate. 2 injection wells, 8 oil wells, geological reserves 9.0×10 6 tons, pore volume 5.0×10 7 m 3 .

[0125] Utilize the method of the present invention to monitor the produced fluid in the process of microbial oil displacement and make adjustments in time to further improve the oil recovery rate of the oil reservoir. The specific steps are as follows:

[0126] (1) Determination of testing indicators and plans for test reservoirs

[0127] The detection indic...

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Abstract

The invention belongs to the technical field of tertiary oil recovery, and relates to a method for improving the recovery efficiency by regulating and controlling a microbial flooding oil reservoir. The method comprises the following steps: determining regulation and control indexes of a test oil reservoir, wherein the regulation and control indexes comprise the concentration of small molecular acid, the concentration of methanogens and the concentration of an activating agent; the regulation and control rounds of the test oil reservoir are determined, the regulation and control rounds of the test oil reservoir are 2-4 rounds, and the time of each round is 12-18 months; determining a test oil reservoir detection scheme, wherein the test oil reservoir detection scheme comprises the detection period, the detection times and the detection starting opportunity; a regulation and control scheme is determined, specifically, the regulation and control scheme is determined according to the detection results of the concentration of the small molecule acid, the concentration of methanogens and the concentration of the activating agent; and performing field implementation and effect evaluation. The method has the characteristics of simple regulation and control process, clear regulation and control thought, strong pertinence, remarkable regulation and control effect and the like, and the recovery rate is improved by more than 15% through field tests.

Description

technical field [0001] The invention belongs to the technical field of tertiary oil recovery, and relates to a method for regulating and improving the recovery rate of microbial flooding oil reservoirs. Background technique [0002] Microbial flooding is a technology that injects microorganisms and their nutrients from water injection wells, and uses microorganisms and their metabolites to enhance oil recovery. At present, the activator formula and injection volume of the block where microbial oil flooding is implemented are determined through previous numerical simulation and physical simulation. In the implementation of the project, the injection is strictly designed according to the plan, and injection adjustments are rarely made. Both numerical and physical simulations have their limitations. [0003] The difficulty of numerical simulation technology is that microorganisms are a kind of living body, and their migration and production increase in the formation is a very...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/22C09K8/582
CPCE21B43/16C09K8/582
Inventor 宋永亭陈琼瑶刘方耿雪丽孙刚正巴燕曹功泽汪刚跃李彩风赵润林
Owner CHINA PETROLEUM & CHEM CORP
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