Reducible and degradable water clarifier as well as preparation method and application thereof

A technology of water clearing agent and initiator, applied in the field of reducible and degradable water clearing agent, can solve the problems of poor effect and slow onset of effect, and achieve good effect, fast onset of effect and difficult treatment

Inactive Publication Date: 2021-05-14
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cationic agents have fast onset and good effect, but will cause serious sludge problems; non-ionic agents will not generat

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1. Preparation of reducible and degradable water clearing agent for polymer flooding produced water treatment

[0033] First, weigh 57g of N,N-dimethylacrylamide, 3g of diallylamine, 30g of methacryloyloxyethyltrimethylammonium chloride and 40g of ethanol into the reactor, raise the temperature to 55°C, and Add 0.3g of initiator azobisisobutyronitrile to react for 8h after entering nitrogen gas for 30min to obtain N,N-dimethylacrylamide and diallylamine oligomer ethanol solution; then add 1.24gN,N'-bis( Acryloyl cystamine was reacted at 70°C for 2 hours to obtain thermally degradable water purifying agent 1.

Embodiment 2

[0034] Example 2. Preparation of reducible and degradable water clearing agent for polymer flooding produced water treatment

[0035] First, weigh 57g N-(3-dimethylaminopropyl) methacrylamide, 3g diallylamine, 30g methacryloyloxyethyltrimethylammonium chloride and 40g ethanol and add them to the reactor, Raise the temperature to 55°C, feed nitrogen for 30 minutes, then add 0.3 g of initiator tert-butyl hydroperoxide to react for 8 hours to obtain N-(3-dimethylaminopropyl) methacrylamide and diallylamine oligomer ethanol solution; then add 1.24g of N,N'-bis(acryloyl)cystamine and react at 70°C for 2 hours to obtain thermally degradable water purifying agent 2.

Embodiment 3

[0036] Example 3. Preparation of reducible and degradable water clearing agent for polymer flooding produced water treatment

[0037] First, weigh 57g of dimethylaminoethyl methacrylate, 3g of diallylamine, 30g of diallyldimethylammonium chloride and 40g of ethanol into the reactor, raise the temperature to 55°C, and blow in nitrogen for 30min Then add 0.3g initiator azobisisobutyronitrile and react for 8h to obtain ethanol solution of dimethylaminoethyl methacrylate and diallylamine oligomer; then add 1.24gN,N'-bis(acryloyl ) cystamine, and reacted at 70°C for 2 hours to obtain thermally degradable water clearing agent 3.

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PUM

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Abstract

The invention discloses a reducible and degradable water clarifier as well as a preparation method and application thereof. The preparation method of the reducible and degradable water clarifier comprises the following steps: (1) carrying out polymerization reaction on polymerizable tertiary amine, a cationic comonomer and polymerizable primary amine and/or polymerizable secondary amine in an inert atmosphere in the presence of an initiator to obtain an oligomer; and (2) adding a reducible and degradable chain extender into the oligomer, and carrying out chain extension reaction. The polymerizable tertiary amine is at least one of N,N-dimethylacrylamide, N-(3-dimethylaminopropyl)methacrylamide and dimethylaminoethyl methacrylate; the cationic comonomer is diallyldimethylammonium chloride and/or acryloyloxyethyl trimethyl ammonium chloride; the polymerizable secondary amine is diallylamine; and the polymerizable primary amine is allyl primary amine. The degradable water clarifier can be degraded in hot water and has a good oil removal rate when being used for treating polymer flooding produced water, and formed polymer-containing flocs have self-digestion performance.

Description

technical field [0001] The invention relates to a reducible and degradable water purifying agent and its preparation method and application, belonging to the technical field of petroleum industry. Background technique [0002] The produced fluid of polymer flooding has high stability and is difficult to deal with. Usually, the combination of produced fluid chemical agent and physical oil removal is used. Commonly used chemical agents include non-ionic demulsifiers, reverse demulsifiers and cationic flocculants and reverse demulsifiers. Cationic agents have fast onset and good effect, but will cause serious sludge problems; non-ionic agents will not generate sludge due to electrostatic neutralization with the returned anionic polyacrylamide, but have slow onset and poor effect. In actual production, a treatment agent with quick onset, good effect and no sludge is needed. Contents of the invention [0003] The purpose of the present invention is to provide a kind of reduci...

Claims

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Application Information

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IPC IPC(8): C08F220/54C08F220/60C08F220/34C08F226/02C08F8/34
CPCC08F220/54C08F220/60C08F220/34C08F226/02C08F8/34
Inventor 王秀军王姗姗张健胡科靖波华朝赵春花
Owner CHINA NAT OFFSHORE OIL CORP
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