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A cationic coated flocculant and its preparation method

A flocculant and cationic technology, which is applied in the field of cationic coated flocculant and its preparation, can solve the problems of limited flocculation performance and poor coating performance of coating agent, so as to improve temperature resistance and hydrolysis resistance, and improve coating flocculation effect, the effect of improving the recycling rate

Active Publication Date: 2020-07-31
中石化石油工程技术服务有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this kind of coating agent has poor coating performance and limited flocculation performance.

Method used

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  • A cationic coated flocculant and its preparation method
  • A cationic coated flocculant and its preparation method
  • A cationic coated flocculant and its preparation method

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preparation example Construction

[0029] The invention also discloses a preparation method of a cationic coated flocculant, comprising the following steps:

[0030] After mixing monomer A, monomer B and monomer C according to the mass percentage of (40~80):(0~30):(20~30), adjust the pH value to 9~11, and add the initiator in nitrogen atmosphere agent, after the reaction, a cationic coated flocculant is obtained;

[0031] The monomer A is one or both of acrylamide or methacrylamide;

[0032] The monomer B is one or both of N,N-dimethylacrylamide or N,N-diethylacrylamide;

[0033] The monomer C is methacryloyloxyethyltrimethylammonium chloride, acryloyloxyethyltrimethylammonium chloride, dimethylaminoethyl acrylate or dimethylaminoethyl methacrylate.

[0034] The invention uses monomer A, monomer B and monomer C as raw materials to prepare cationic coated flocculant. The monomer A is one or both of acrylamide and methacrylamide. The function of the monomer B is to provide temperature resistance and hydrolysi...

Embodiment 1

[0040]Add 56g of acrylamide, 19g of N,N-dimethylacrylamide, and 25g of methacryloyloxyethyltrimethylammonium chloride into 344g of water and adjust the pH value to 11 after fully dissolving it. Slowly add 0.04g of ammonium persulfate and 0.04g of sodium bisulfite initiator, and keep warm at 40°C for 8 hours to obtain a gel-like polymer. The product is sheared, granulated, dried and pulverized at 60°C to obtain Cationic coated flocculant.

[0041] figure 1 It is the infrared spectrogram of the first part of cationic coating flocculant prepared by embodiment 1:

[0042] Depend on figure 1 Visible, 3423cm in the picture -1 It is the absorption peak of the N-H stretching vibration of -amide; 2927cm -1 Asymmetric absorption peaks for methyl and methylene; 1650cm -1 It is the characteristic absorption peak of the carbonyl group in the amide group; 1451.91cm -1 for -CH 2 -N(CH 3 ) 3 The characteristic absorption peaks of the bending vibration absorption peak of the methylene...

Embodiment 2

[0046] Add 67g of acrylamide, 7g of N,N-diethylacrylamide, and 26g of acryloyloxyethyltrimethylammonium chloride to 300g of water, adjust the pH value to 9 after fully dissolving, blow nitrogen gas for 40min, and slowly add 0.03g of ammonium persulfate and 0.03g of sodium bisulfite initiator were incubated at 20°C for 16 hours to obtain a gel-like polymer. The product was sheared and granulated, dried and crushed at 90°C to obtain a cationic By flocculant. Its structural formula is as follows:

[0047]

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Abstract

The invention provides a cationic coating flocculant, which has a number-average molecular weight of 8 million-12 million and has a structural formula shown as I. The preparation method consists of: mixing a monomer A, a monomer B and a monomer C according to a mass percentage of (40-80):(0-30):(20-30), then adjusting the pH value to 9-11, adding an initiator in a nitrogen atmosphere, and carrying out reaction to obtain the cationic coating flocculant. The coating flocculant provided by the invention has high relative molecular mass, improves the coating flocculation effect and inhibition and anti-collapse ability of the product, and can satisfy the requirements of strong inhibition, strong adsorption and strong coating performance of atomized drilling fluid. Experimental results show that when the dosage of the cationic coating flocculant provided by the invention is 0.03%, the 5min clear liquid precipitation quantity is 90.7%, the clear liquid precipitation quantity is large, flocs settle fast, the cationic coating flocculant can effectively flocculate atomized sewage and improve the cyclic utilization rate of atomization base fluid. Under the circumstance of a dosage of 0.05%, the clear liquid precipitation rate is 92.0%-98.5%.

Description

technical field [0001] The invention relates to the field of polymer flocculants, in particular to a cationic coated flocculant and a preparation method thereof. Background technique [0002] Atomization drilling is an effective technical measure to solve technical problems such as drilling tool bagging and cuttings carrying difficulties encountered in gas drilling. A variety of drilling fluid treatment agents are usually used in atomized drilling, and coated flocculants are one of them. [0003] Coating flocculants refer to products used to coat or flocculate harmful solid phases to prevent their dispersion from affecting wellbore stability and rheological properties of drilling fluids. The coated flocculant for atomized drilling can inhibit the anti-collapse flocculation of atomized sewage, improve the comprehensive performance of atomized fluid, improve the circulation utilization rate of atomized base fluid, and prolong the operation time of atomized drilling. foundati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/56C08F220/54C08F220/34C09K8/035
Inventor 孙举苏雪霞郝纪双宋亚静张亚东韩洪伟
Owner 中石化石油工程技术服务有限公司
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