A method for microbial treatment of precipitation and oil increase in high water-cut horizontal wells

A technology for microbial treatment and horizontal wells, which is applied in earthwork drilling, wellbore/well parts, mining fluids, etc. It can solve problems such as unsatisfactory application effects in mines, difficulty in injecting waterways, and poor plugging effects, etc., to achieve effective Water blocking, strong injection ability, good plugging effect

Active 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

Chemical water plugging is often used, and chemical agents such as swelling diagenetic agents and gels are used to squeeze into the water outlet section to achieve the purpose of water plugging. The main problems in the use of these chemical plugging agents are: if the plugging agent strength Low, although it is easy to inject, but the plugging effect is not good, the plugging agent has high strength and is difficult to inject into the waterway, and most of the application effects in the mine are not ideal

Method used

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  • A method for microbial treatment of precipitation and oil increase in high water-cut horizontal wells
  • A method for microbial treatment of precipitation and oil increase in high water-cut horizontal wells
  • A method for microbial treatment of precipitation and oil increase in high water-cut horizontal wells

Examples

Experimental program
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Effect test

Embodiment 1

[0042] Test well D of an oil production plant in Shengli Oilfield 12 Overview: Reservoir temperature is 70°C, reservoir pressure is 14.2MPa, reservoir thickness is 2.5m, permeability is 800×10 -3 μm 2 , porosity 27%, horizontal section length 420m, crude oil viscosity 1652mPa·s, comprehensive water cut 92.5%, formation water salinity 11500mg / L. Utilize the method of the present invention to carry out precipitation to increase oil in this well, concrete steps are as follows:

[0043] (1) Screening of test wells

[0044] Test well D 12 Water content 92.5%, crude oil viscosity 1652mPa.s, horizontal section length 420m, reservoir temperature 70℃, calcium Ca in formation water 2+ , Mg 2+ and Fe 3+ The content ratio is 215mg / L, 182mg / L and 16mg / L. Meet the screening requirements of the present invention.

[0045] (2) Screening of nitrate reducing bacteria

[0046] The screening of nitrate reducing bacteria, the specific method is as follows: take the test oil well D 12 Pla...

Embodiment 2

[0078] Test well D of an oil production plant in Shengli Oilfield 15 General situation: Reservoir temperature is 75°C, reservoir pressure is 12.5MPa, reservoir thickness is 2.0m, permeability is 950×10 -3 μm 2 , porosity 26.5%, horizontal section length 350m, crude oil viscosity 1528mPa·s, comprehensive water cut 96.2%, formation water salinity 12562mg / L. Utilize the method of the present invention to carry out precipitation to increase oil in this well, concrete steps are as follows:

[0079] (1) Screening of test wells

[0080] Test well D 15 Water content 96.2%, crude oil viscosity 1528mPa.s, horizontal section length 350m, reservoir temperature 75℃, calcium Ca in formation water 2+ , Mg 2+ and Fe 3+ The content ratio is 325mg / L, 232mg / L and 25mg / L. Meet the screening requirements of the present invention.

[0081] (2) Screening of nitrate reducing bacteria

[0082] The screening of nitrate reducing bacteria, the specific method is as follows: take the test oil wel...

Embodiment 3

[0115] Test well E of an oil production plant in Shengli Oilfield 15 Overview: Reservoir temperature is 80°C, reservoir pressure is 12.0MPa, reservoir thickness is 2.5m, permeability is 1200×10 -3 μm 2 , porosity 32.5%, horizontal section length 400m, crude oil viscosity 1258mPa·s, comprehensive water cut 97.0%, formation water salinity 11256mg / L. Utilize the method of the present invention to carry out precipitation to increase oil in this well, concrete steps are as follows:

[0116] (1) Screening of test wells

[0117] Test well E 15 Water content 97.0%, crude oil viscosity 1258mPa.s, horizontal section length 400m, reservoir temperature 80℃, calcium Ca in formation water 2+ , Mg 2+ and Fe 3+ The content ratio is 278mg / L, 215mg / L and 20mg / L. Meet the screening requirements of the present invention.

[0118] (2) Screening of nitrate reducing bacteria

[0119] The screening of nitrate reducing bacteria, the specific method is as follows: take the test oil well E 15 ...

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Abstract

The invention belongs to the technical field of microbial oil recovery, and in particular relates to a method for microbial treatment of precipitation and oil enhancement in high-water-cut horizontal wells. The method specifically includes the following steps: screening of test oil wells; screening of nitrate-reducing bacteria; screening of polysaccharide microorganisms produced; determination of the optimum ratio of compound bacteria; determination of field injection process parameters; field test and effect evaluation. The present invention has a wide range of adaptability to oil reservoirs; the composite bacteria and nutrient solution of the present invention are both water-soluble substances, have strong injection capabilities, will not cause injection pressure to increase, and will not cause damage to oil reservoirs; at the same time, the present invention The precipitation of calcium salt and iron salt and biological polysaccharides are used to form a composite plugging agent with high plugging strength to achieve effective water plugging of horizontal wells with good plugging effect.

Description

technical field [0001] The invention belongs to the technical field of microbial oil recovery, and in particular relates to a method for microbial treatment of precipitation and oil enhancement in high-water-cut horizontal wells. Background technique [0002] Horizontal wells can significantly increase the productivity of a single well and improve economic benefits, and the development of horizontal wells can achieve high production and high recovery with fewer wells. But in practical application, most horizontal wells contain more than 90% water, but these horizontal wells all have development potential. Due to the influence of edge and bottom water ridges in horizontal wells, breakthroughs at several points often lead to a rapid increase in water cut, so how to accurately find the water outlet point of the horizontal well and implement feasible water shutoff is the key to reducing the water cut of the horizontal well. Existing water finding methods for horizontal wells in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/22
CPCE21B43/16
Inventor 汪卫东陈琼瑶冯云林军章孙刚正王新耿雪丽汪刚跃曹嫣镔宋永亭
Owner CHINA PETROLEUM & CHEM CORP
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