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Method for microbial flooding by using microbial polysaccharide system

A microbial polysaccharide and microbial oil flooding technology, which is applied in chemical instruments and methods, production fluids, earth drilling and production, etc., can solve the problems of ineffective activation of endogenous microorganisms in high permeability oil layers, single function of polymers, channeling, etc., to achieve Enhanced oil recovery, improved oil washing efficiency, and low injection pressure

Inactive Publication Date: 2018-02-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Especially for high water-cut reservoirs with strong heterogeneity, after the traditional activator system is injected into the formation, channeling tends to occur along the dominant channel, which limits the sweep efficiency of the activator system in the reservoir, making the internal The source microorganisms cannot be fully activated, weakening the interaction between endogenous microorganisms and remaining oil, and reducing the oil displacement effect of endogenous microorganisms. Microbial approach to enhanced oil recovery
[0003] Microbial flooding in medium-high permeability reservoirs usually injects polymers for profile control before microbiological flooding. Although this method can expand the swept volume of the activator, it has the following disadvantages: the injected polymer has a single function and can only play a role. Plugging effect, cannot be used as an activator component; due to the plugging effect of polymers in high-permeability oil layers, the amount of activator entering high-permeability oil layers is very small, so this method cannot effectively activate endogenous microorganisms in high-permeability oil layers, thus affecting The degree of enhanced oil recovery by microbial flooding

Method used

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  • Method for microbial flooding by using microbial polysaccharide system
  • Method for microbial flooding by using microbial polysaccharide system
  • Method for microbial flooding by using microbial polysaccharide system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Example 1: Taking Block A of an oil production plant in Shengli Oilfield as an example

[0041] The depth of reservoir A in this block is 1162m-1350m, the reservoir temperature is 65°C, the reservoir pressure is 11.07MPa, the permeability variation coefficient is 0.828, the porosity is 0.35, and the permeability is 6870×10 -3 μm 2 , the formation water salinity is 9327mg / L, the water content is 98.5%, the crude oil viscosity is 1200mPa.s, the reservoir layers are 3 layers, and the oil-bearing area is 0.83km 2 , the effective thickness of the high-permeability oil layer is 10.1m, the effective thickness of the low-permeability oil layer is 8.5m, and the geological reserves are 154.9×10 4 t, implementing the steps of the present invention is:

[0042] (1) Reservoir screening

[0043] Reservoir temperature in block A is 500×10 -3 μm 2 , the permeability coefficient of variation ≥ 0.7, and the reservoir layers are greater than 2 layers, which meet the criteria for rese...

Embodiment 2

[0074] Example 2: Taking Block F of an oil production plant in Shengli Oilfield as an example

[0075] The burial depth of this block is 940m-1120m, the reservoir temperature is 50°C, the reservoir pressure is 8.25MPa, the permeability variation coefficient is 0.785, the porosity is 0.25, and the permeability is 3856×10 -3 μm 2 , the oil reservoir has 4 layers, the salinity of formation water is 1546mg / L, the viscosity of crude oil is 960mPa.s, the water content is 98.8%, and the oil-bearing area of ​​the test area is 0.52km 2 , the effective thickness of the high-permeability oil layer is 8.5m, the effective thickness of the low-permeability oil layer is 9.2m, and the geological reserves are 105.2×10 4 t, implementing the steps of the present invention is:

[0076] (1) Reservoir screening

[0077] Reservoir temperature in block F is 500×10 -3 μm 2 , the permeability coefficient of variation ≥ 0.7, and the reservoir layers are greater than 2 layers, which meet the reservo...

Embodiment 3

[0108] Example 3: Taking Block G of an oil production plant in Shengli Oilfield as an example

[0109] The reservoir depth in this block is 1354m-1520m, the reservoir temperature is 70°C, the reservoir pressure is 9.25MPa, the permeability variation coefficient is 0.905, the porosity is 0.41, and the permeability is 9250×10 -3 μm 2 , the formation water salinity is 18526mg / L, the crude oil viscosity is 1870mPa.s, the water content is 98.5%, the oil reservoir has 4 layers, and the oil-bearing area of ​​the test area is 0.82km 2 , the effective thickness of the high-permeability oil layer is 13.6m, the effective thickness of the low-permeability oil layer is 10.2m, and the geological reserves are 169.2×10 4 t, implementing the steps of the present invention is:

[0110] (1) Reservoir screening

[0111] In block G, the reservoir temperature is 500×10 -3 μm 2 , the permeability coefficient of variation ≥ 0.7, and the reservoir layers are greater than 2 layers, which meet the ...

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Abstract

The invention belongs to the technical field of tertiary oil recovery, particularly relates to a method for microbial flooding by using a microbial polysaccharide system. The method includes the following steps of screening of oil deposits, screening of a microbial polysaccharide activation agent system, determination of the on-site injection amount and injection process of the microbial polysaccharide activation agent system, execution of a field test and evaluation of the field-test effect. The method has the advantages that the process is simple and highly targeted, the field-test effect isgood and the input-output ratio is high, the input-output ratio is larger than 1:6, the comprehensive water decrease rate is larger than 10%, and the recovery ratio is larger than 15%. The method iseconomical and effectively improves the oil reservoir rate, and the method can be widely used in the technical field of microbial oil recovery.

Description

technical field [0001] The invention belongs to the technical field of tertiary oil recovery, and in particular relates to a method for microbial oil displacement using a microbial polysaccharide system. Background technique [0002] Endogenous microbial oil recovery technology is to enhance oil recovery by injecting activators into the reservoir and using the growth and metabolism of microorganisms under the reservoir conditions. As an environmentally friendly, low-cost sustainable development technology, this technology has shown good application results in field tests. However, with the continuous development of oilfields, most of the reservoirs in major domestic oilfields have entered the stage of high water cut, and the comprehensive water cut is greater than 90%, and the dominant channels in the reservoirs have gradually formed. Especially for high water-cut reservoirs with strong heterogeneity, after the traditional activator system is injected into the formation, it...

Claims

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Application Information

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IPC IPC(8): E21B43/22C09K8/582
CPCE21B43/16C09K8/582
Inventor 李彩风曹嫣镔宫俊峰宋永亭刘涛高光军冯云吴晓玲汪刚跃郭辽原
Owner CHINA PETROLEUM & CHEM CORP
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