Method for utilizing modified functional microorganisms to lower oil deposit water sensitivity

A functional and microbial technology, applied in the field of using modified functional microorganisms to reduce reservoir water sensitivity, can solve reservoir water sensitivity and other problems, achieve the effect of increasing daily water injection, wide application range and strong operability

Active Publication Date: 2018-04-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention firstly analyzes the content of clay minerals in the oil reservoir and the content of montmorillonite in the clay minerals; secondly analyzes the modified functional microorganisms in the oil reservoir, and screens a suitable activator to activate the modified functional microorganisms; finally uses the modified functional microorganisms to convert the clay minerals The montmorillonite in the oil is transformed into illite, which changes the mineral composition of the rock in the oil reservoir and solves the problem of water sensitivity in the oil reservoir

Method used

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  • Method for utilizing modified functional microorganisms to lower oil deposit water sensitivity
  • Method for utilizing modified functional microorganisms to lower oil deposit water sensitivity
  • Method for utilizing modified functional microorganisms to lower oil deposit water sensitivity

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Embodiment 1

[0036] Block A of an oil production plant in Shengli Oilfield 12 , belongs to the high permeability water sensitive reservoir, the reservoir temperature is 60℃, the permeability is 760×10 -3 μm 2 , The thickness of the oil layer is 12.0m. Before the test, the content of clay minerals in the rock minerals of the reservoir accounts for 20%, of which the content of montmorillonite in clay minerals is 35%, the water sensitivity index is 0.75, and the pore volume is 2.0×10 4 m 3 , the daily water injection volume of the block is 50m 3 , 2.2×10 iron-reducing bacteria were detected in the reservoir produced fluid 2 individual / mL. The reservoir is a reservoir with high clay content, strong water sensitivity, and poor connectivity. There are damages caused by clay swelling and particle migration, which make it difficult to inject water due to high injection pressure during water injection. Utilize the method of the present invention to implement field test in this high-permeabilit...

Embodiment 2

[0054] Block C of an oil production plant in Shengli Oilfield 10 , belongs to the low permeability water sensitive reservoir, the reservoir temperature is 65℃, the permeability is 120×10 -3 μm 2 , The thickness of the oil layer is 20.5m. Before the test, the content of clay minerals in the rock minerals of the reservoir accounts for 21.5%, of which the content of montmorillonite in clay minerals is 28.5%, the water sensitivity index is 0.80, and the pore volume is 4.2×10 4 m 3 , the daily water injection volume of the block is 60m 3 , 2.0×10 Pseudomonas bacteria were detected in the oil reservoir production fluid 2 individual / mL. The reservoir is a water-sensitive reservoir with high clay content, and there are damages caused by clay swelling and particle migration, which make it difficult to inject water due to high injection pressure during water injection. Utilize the method of the present invention to implement field test in this low-permeability water-sensitive oil r...

Embodiment 3

[0073] Block A of an oil production plant in Shengli Oilfield 10 , belongs to the high permeability water sensitive reservoir, the reservoir temperature is 72℃, the permeability is 1200×10 -3 μm 2 , The thickness of the oil layer is 9.5m. Before the test, the content of clay minerals in the rock minerals of the reservoir accounts for 21.2%, of which the content of montmorillonite in clay minerals is 32.2%, the water sensitivity index is 0.72, and the pore volume is 5.0×10 4 m 3 , the daily water injection volume of the block is 40m 3 , 3.2×10 iron-reducing bacteria were detected in the reservoir produced fluid 2 individual / mL. The reservoir is a reservoir with high clay content, strong water sensitivity, and poor connectivity. There are damages caused by clay swelling and particle migration, which make it difficult to inject water due to high injection pressure during water injection. Utilize the method of the present invention to implement field test in this high-permeab...

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Abstract

The invention belongs to the technical field of oil and gas field development, and particular relates to a method for utilizing modified functional microorganisms to lower the oil deposit water sensitivity. The method specifically comprises the following steps of screening a testing oil deposit; screening modified functional bacteria activator; determining the injecting amount of the activator; determining the culturing time; conducting a field test. The modified functional microorganisms are utilized to change properties of rocks, montmorillonite high in water sensitivity is turned into illite, the problem of the oil deposit water sensitivity is effectively solved, the content of montmorillonite in clay mineral is lowered by 90% or above, and the water sensitivity index is lowered by 95%or above. The method has the advantages of being simple in technology, high in operability and high in field testing effect, the daily water injecting amount is increased by 200% or above, and the field testing recovery efficiency is larger than 10%. Thus, the method can be widely applied to the field test for lowering the oil deposit water sensitivity.

Description

technical field [0001] The invention belongs to the technical field of oil field development, and in particular relates to a method for reducing water sensitivity of oil reservoirs by using modified functional microorganisms. Background technique [0002] In the development process of low-permeability oilfields, water injection is an important measure to maintain reservoir pressure and achieve stable and high production. The key to ensuring that water injection wells can inject water and inject water well is not to damage the water injection reservoir. The main cause of reservoir water sensitivity is clay minerals, which widely exist in oil layers. When the reservoir contains 5-20% clay, it is considered to be an oil layer with high clay content. Improper measures will cause clay minerals to expand, decompose, and migrate, resulting in a decrease in permeability, and in severe cases, the problem of infusion failure will occur. [0003] At present, for reservoirs with strong...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/22E21B43/20
CPCE21B43/16E21B43/20
Inventor 吴晓玲胡婧宋永亭冯云刘涛巴燕汪刚跃赵风敏谭晓明曹嫣镔
Owner CHINA PETROLEUM & CHEM CORP
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