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Delayed cross-linked polymer system

A technology for cross-linking polymers and polymers, which is applied to drilling compositions, chemical instruments and methods, etc., can solve the problems of high construction cost, complex cross-linking agents, and complicated processes, and achieves improved leaching efficiency and gel formation. High strength, easy to formulate effect

Active Publication Date: 2017-07-07
BEIJING RESEARCH INSTITUTE OF CHEMICAL ENGINEERING AND METALLURGY
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  • Abstract
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  • Claims
  • Application Information

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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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  • Delayed cross-linked polymer system

Examples

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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 hydroquinone and formaldehyde, then add 4mg of cross-linking retarder tallow dihydroxyethyl betaine, stir well, and keep at room temperature under cross-linking; its viscosity changes with time are shown 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 hydroquinone and formaldehyde, then add 100mg of cross-linking retarder tallow dihydroxyethyl betaine, stir well, and keep at room temperature under cross-linking; its viscosity changes with time are shown 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 hydroquinone and formaldehyde, then add 200mg of cross-linking retarder tallow dihydroxyethyl betaine, stir well, and keep at room temperature under cross-linking; its viscosity changes with time are shown 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 blocking high-permeability channels or blocking part of high-permeability layers in the process of in-situ leaching uranium mining, so as to control the leaching range of leaching agents, reduce reagent consumption, and increase uranium production. Fluid control system for recovery rate Technical field; the present invention also relates to delayed cross-linking depth profile control in petroleum exploitation; the present invention relates to a delayed cross-linked 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 better permeability. This feature makes the leachant easy to lose along the surrounding rock outside the ore body when the leachant is injected into the ore seam, resulting in...

Claims

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Application Information

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Patent Type & Authority Applications(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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