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Method for reducing viscosity loss of oilfield polymer solution by using bacterial activity inhibitor

A technology of bacterial activity and viscosity loss, applied in drilling compositions, chemical instruments and methods, earthwork drilling, etc., can solve the problem of high viscosity loss rate of polymer solution, achieve wide applicability, reduce effect, reduce viscosity The effect of loss rate

Pending Publication Date: 2020-09-01
HUACHEN ENVIRONMENTAL PROTECTION ENERGY (GUANGZHOU) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem of high bacterial content resulting in high polymer solution viscosity loss rate in the existing pollution-diluted-diluted process, the present invention proposes a method for reducing oilfield polymer solution viscosity loss by using bacterial activity inhibitors

Method used

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  • Method for reducing viscosity loss of oilfield polymer solution by using bacterial activity inhibitor
  • Method for reducing viscosity loss of oilfield polymer solution by using bacterial activity inhibitor
  • Method for reducing viscosity loss of oilfield polymer solution by using bacterial activity inhibitor

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specific Embodiment approach 1

[0019] Specific embodiment 1: In this embodiment, the method of reducing the viscosity loss of oilfield polymers by using bacterial activity inhibitors is carried out according to the following steps: take the bacterial activity inhibitors, the bacterial activity inhibitors are composed of A medicament and B medicament, and the A medicament is first added to the oil field In the produced water, the agent B is added to the oilfield produced water to obtain the oilfield produced water containing the bacterial activity inhibitor, and the oilfield produced water containing the bacterial activity inhibitor is used for the preparation and dilution of the polymer solution;

[0020] The agent A is an aqueous solution of nitrite; the agent B is an aqueous solution of sodium edetate.

[0021] The bacterial activity inhibitor of this embodiment can be used to reduce the problem of viscosity loss of the polymer solution caused by high bacterial content in the process of mixing and diluting...

specific Embodiment approach 2

[0023] Embodiment 2: This embodiment differs from Embodiment 1 in that: the mass ratio of the drug A to the drug B is (19-21):1.

specific Embodiment approach 3

[0024] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that: the mass fraction of nitrite in the agent A is 35-45%.

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Abstract

The invention discloses a method for reducing viscosity loss of an oil field polymer solution by using a bacterial activity inhibitor, and relates to a method for reducing viscosity loss of an oil field polymer solution. The objective of the invention is to solve the problem of high polymer solution viscosity loss rate caused by high bacterium content in existing sewage preparation and dilution processes. A bacterial activity inhibitor is added into oilfield produced water, and the oilfield produced water containing the bacterial activity inhibitor is used for preparation and dilution of a polymer solution; the bacterial activity inhibitor is composed of an agent A and an agent B, wherein the agent A is an aqueous solution of a nitrite; and the agent B is an aqueous solution of sodium ethylene diamine tetracetate. The bacterial activity inhibitor disclosed by the invention can be used for reducing the problem of viscosity loss of a polymer solution caused by relatively high bacterial content in a polymer solution pollutant diluting process, and the method is flexible to operate and wide in applicability. The method is suitable for reducing the viscosity loss of the oilfield polymersolution.

Description

technical field [0001] The invention relates to a method for reducing viscosity loss of oil field polymer solution. Background technique [0002] Polymer flooding refers to the method of using polymer as an oil displacement agent to inject the formation from the injection well, and drive the oil to the production well to enhance the oil recovery. Hydrolyzable polymers such as partially hydrolyzed polyacrylamide (HPAM) are widely used at this stage. HPAM has the characteristics of increasing the viscosity of the water phase and improving the mobility ratio in aqueous solution, and is an important technology to ensure oil recovery at this stage. [0003] With the continuous development of oilfields, the preparation, dilution and injection of polymers at this stage mostly use the preparation of oilfield sewage (oilfield produced water) and the dilution process of oilfield sewage (pollution and sewage dilution process). This process is to a certain extent It alleviates the pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/588E21B43/22
CPCC09K8/588E21B43/16
Inventor 魏利魏东李春颖张昕昕欧阳嘉潘春波赵云发
Owner HUACHEN ENVIRONMENTAL PROTECTION ENERGY (GUANGZHOU) CO LTD