Polymer flooding solution injection method based on injection pipeline
A polymer and pipeline technology, which is applied in drilling compositions, chemical instruments and methods, and earth-moving drilling and production, etc., can solve the viscosity loss of polymer flooding solution, reduce the oil flooding effect of polymer flooding solution, and reduce oil recovery efficiency, etc. problems, to achieve the effect of improving efficiency, avoiding viscosity drop, and reducing viscosity loss rate
Pending Publication Date: 2022-06-03
PETROCHINA CO LTD
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[0004] In the above technical scheme, even if the polymer flooding solution has a high viscosity in the dispensing station, as the polymer flooding solution flows through the injection pipeline on the ground, the viscosity of the polymer flooding solution will continue to lose, thus The oil displacement effect of the polymer flooding solution is reduced, which reduces the oil recovery efficiency
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[0031] In order to make the objectives, technical solutions and advantages of the present application clearer, the embodiments of the present application will be further described in detail below with reference to the accompanying drawings.
[0032] First, the terms involved in the embodiments of the present application are introduced.
[0033] Chemical flooding technology (Chemical Flooding): Also known as modified water flooding chemical method, it refers to adding chemicals to injected water to change the physical and chemical properties of the displacing fluid and the interface properties between the displacing fluid, crude oil and rock minerals. An oil recovery method that facilitates crude oil production. Displacement fluids refer to oil-displacing agents used to expel and displace crude oil in the formation.
[0034] The chemical flooding solution includes polymer flooding solution. The polymer main agent in the polymer flooding solution adheres to the pore wall, which...
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Abstract
The invention discloses a polymer flooding solution injection method based on an injection pipeline, and relates to the field of tertiary oil recovery. The method comprises the following steps: detecting the content of bacteria in an injection pipeline; injecting a bactericide solution into the injection pipeline according to the bacterial content, and sterilizing the injection pipeline; and injecting a polymer flooding solution into the injection pipeline subjected to sterilization treatment. The content of bacteria in the sterilized injection pipeline is reduced, so that the phenomenon of viscosity reduction caused by chemical degradation of the bacteria on the polymer flooding solution is avoided; besides, the injection pipeline with a corrosion-resistant layer is adopted, and the flow rate of the polymer flooding solution in the injection pipeline is controlled through the pipe diameter size to synergistically reduce the viscosity loss rate of the polymer flooding solution in the injection pipeline, so that the oil displacement efficiency by using the polymer flooding solution is improved.
Description
technical field [0001] The present application relates to the field of tertiary oil recovery, in particular to a method for injecting a polymer flooding solution based on an injection pipeline. Background technique [0002] Chemical flooding technology refers to an oil recovery method that is beneficial to crude oil production by adding chemical agents to injected water to change the physical and chemical properties of the displacing fluid and the interface properties between the displacing fluid and crude oil and rock minerals. The chemical flooding solution includes a polymer flooding solution, and the main agent of the polymer flooding solution is a polymer. [0003] Viscosity is a key control parameter for efficient oil displacement of polymer flooding solutions. In the related art, when the polymer solution is prepared in the dispensing station, the polymer flooding solution is prepared by adding a chemical agent with auxiliary functions such as a bactericide to the pr...
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IPC IPC(8): E21B43/22E21B47/00C09K8/588
CPCE21B43/16E21B47/00C09K8/588
Inventor 苑光宇闫云贵邢立国严曦崔丹丹柳敏赵凤祥庄永涛梁杰叶云龙
Owner PETROCHINA CO LTD