Method for reducing viscosity loss by regulating and controlling microbial community structure composition in polymer prepared from oilfield produced water

A technology for microbial community and polymer preparation, applied in drilling compositions, chemical instruments and methods, etc., can solve problems such as polymer viscosity decrease, and achieve the effect of reducing utilization, convenient preparation and use, and reducing viscosity loss

Pending Publication Date: 2020-09-15
HUACHEN ENVIRONMENTAL PROTECTION ENERGY (GUANGZHOU) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims to solve the technical problem that sulfate-reducing bacteria cause polymer viscosity to decrease, and provides a method for reducing viscosity loss by regulating the microbial community structure composition in polymers prepared from oilfield produced water

Method used

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  • Method for reducing viscosity loss by regulating and controlling microbial community structure composition in polymer prepared from oilfield produced water
  • Method for reducing viscosity loss by regulating and controlling microbial community structure composition in polymer prepared from oilfield produced water
  • Method for reducing viscosity loss by regulating and controlling microbial community structure composition in polymer prepared from oilfield produced water

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specific Embodiment approach 1

[0016] Specific Embodiment 1: This embodiment is a method for reducing viscosity loss by adjusting and controlling the microbial community structure composition in polymers prepared from oilfield produced water, specifically as follows:

[0017] 1. Preparation of ecological viscosity loss stabilizer mother liquor: by mass fraction 15% to 25% of nitrate, 1% to 5% of nitrite, 1% to 2% of stabilizer, 0.1% to 0.5% of nutritional elements and The remaining amount of tap water or the oilfield produced water used to prepare the polymer weighs the raw material, then stirs and dissolves with a stirrer to obtain the mother liquor of the ecological viscosity loss stabilizer;

[0018] Two, the ecological viscosity loss stabilizer mother liquor prepared in step 1 is added to the oil field produced water of the preparation polymer, and the oil field produced water containing the ecological viscosity loss stabilizer is obtained; the described oil field produced water containing the ecological...

specific Embodiment approach 2

[0020] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the nitrate in step 1 is sodium nitrate. Others are the same as the first embodiment.

specific Embodiment approach 3

[0021] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the nitrite described in step 1 is sodium nitrite. Others are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a method for reducing viscosity loss by regulating and controlling microbial community structure composition in a polymer prepared from oilfield produced water, relates to a method for reducing viscosity loss of a polymer prepared from oilfield produced water, and aims to solve the technical problem of polymer viscosity reduction caused by sulfate reducing bacteria. By adding nitrate and nitrite, the ecological niche of denitrifying bacteria can be improved, the ecological niche of sulfate reducing bacteria is reduced, and the community composition of microorganisms inthe injection allocation system is changed so that the viscosity loss of a polymer is reduced. According to the invention, the number of sulfate reducing bacteria in the injection allocation system isreduced, the utilization of the polymer by the sulfate reducing bacteria is reduced, the viscosity loss of the polymer is reduced, and the effective viscosity of the polymer is ensured. According tothe method, sulfate reducing bacteria in the injection allocation system can be effectively inhibited, and no harm is caused to beneficial bacteria in an oil field system. The method is used for reducing the viscosity loss of the polymer prepared from the oilfield produced water.

Description

technical field [0001] The present invention relates to a method for reducing viscosity loss of polymers formulated with oilfield produced water. Background technique [0002] my country's oil companies are in the middle and late stages of exploitation, and improving oil recovery is the key to ensuring the amount of extraction. The development of tertiary oil recovery technology is of great significance to ensure the recovery rate, maintain the stable production of crude oil, and relieve the pressure of supply and demand. Oil flooding is the process of extracting oil from a formation. Polymer flooding has been widely used in the petroleum industry and is one of the most beneficial enhanced recovery processes in many oil formations. Polymer plays a vital role in the application of enhanced oil recovery technology, and the viscosity of the polymer is the key to ensure the oil displacement ability of the polymer. [0003] my country's oilfields initially used clear water to ...

Claims

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Application Information

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IPC IPC(8): C09K8/582C09K8/588
CPCC09K8/582C09K8/588
Inventor 魏利张昕昕李春颖魏东欧阳嘉潘春波赵云发
Owner HUACHEN ENVIRONMENTAL PROTECTION ENERGY (GUANGZHOU) CO LTD
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