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A delayed crosslinking polymer system

A technology of cross-linked polymers and polymers, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of complex cross-linking agents, high construction costs, and complicated processes, and achieve improved leaching efficiency and low cost , the preparation of a simple effect

Active Publication Date: 2020-02-21
BEIJING RESEARCH INSTITUTE OF CHEMICAL ENGINEERING AND METALLURGY
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  • Abstract
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  • Claims
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Problems solved by technology

[0009] In view of the above-mentioned prior art, the purpose of the present invention is to provide a delayed cross-linked polymer system to solve the problem of low strength of the delayed cross-linked polymer system in the prior art, complex cross-linking agents, and complicated methods for controlling the release of cross-linking agents. , high construction costs and other issues

Method used

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  • A delayed crosslinking polymer system

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Effect test

Embodiment 1

[0036] Add 200ml of water to the beaker, then add 0.3g of anionic polyacrylamide, then add 1.2g of benzenediol and formaldehyde, and then add 4mg of crosslinking retardant tallow dihydroxyethyl betaine, stir well, and room temperature Under cross-linking; its viscosity changes with time in Table 1.

Embodiment 2

[0038] Add 200ml of water to the beaker, then add 0.3g of anionic polyacrylamide, then add 1.2g of benzenediol and formaldehyde, and then add 100mg of crosslinking retardant tallow dihydroxyethyl betaine, stir well, at room temperature Under cross-linking; its viscosity changes with time in Table 1.

Embodiment 3

[0040] Add 200ml of water to the beaker, then add 0.3g of anionic polyacrylamide, then add 1.2g of benzenediol and formaldehyde, and then add 200mg of crosslinking retarder tallow dihydroxyethyl betaine, stir well, at room temperature Under cross-linking; its viscosity changes with time in Table 1.

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Abstract

The invention relates to the technical field of in-situ leaching uranium mining, in particular to the technical field of a fluid control system for plugging high-permeability channels or plugging part of high-permeability layers in the in-situ leaching uranium mining process so as to control a leaching agent solution and leaching range, reduce reagent consumption and improve the uranium recovery rate. The invention also relates to a delayed cross-linking depth profile control in oil exploitation and provides a delayed cross-linked polymer system. The delayed cross-linked polymer system comprises high-molecular-weight polyacrylamide, a phenolic aldehyde cross-linking agent and a crosslinking delayer. By adjusting the adding amount of the crosslinking delayer, the crosslinking time can be controlled to reach the effects of meeting the required injection amount and widening a leaching control range. By adopting a crosslinking delayer adding mode, the delayed cross-linked polymer system is low in cost, simple to prepare, low initial viscosity, adjustable in gelling time and high in gelling strength.

Description

Technical field [0001] The invention relates to the technical field of in-situ leaching uranium mining technology, in particular to plugging a high-permeability channel or plugging a part of a high-permeability layer during in-situ leaching of uranium, so as to control the leaching range of leaching agent, reduce reagent consumption, and increase uranium The technical field of the fluid control system for recovery rate; the present invention also relates to the delayed crosslinking depth profile control in oil exploitation; the present invention relates to a delayed crosslinking polymer system. Background technique [0002] During the formation of sandstone-type uranium deposits, ore bodies are often produced in sand bodies with relatively poor permeability, while surrounding rocks have good permeability. This feature makes the leaching agent easy to lose along the surrounding rock outside the ore when the leaching agent is injected into the ore layer, resulting in increased reag...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/512
CPCC09K8/512
Inventor 廖文胜王立民李建华曹霖
Owner BEIJING RESEARCH INSTITUTE OF CHEMICAL ENGINEERING AND METALLURGY
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