Instant-dissolved cationic polyacrylamide capsulation agent and preparing method thereof

A technology of polyacrylamide and acrylamide, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of long time for complete dissolution, unstable mud performance, short dissolution time, etc., and achieve long-term storage and long-distance The effect of excellent transportation and coating inhibition performance and simple post-treatment process

Inactive Publication Date: 2017-01-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of coating agent has the ability to coat the cuttings and prevent the hydration and dispersion of the cuttings, but the high molecular weight coating agent causes the viscosity of the system to increase when used (Fan Yufu, Journal of Shengli College, China University of Petroleum, 2008, 22(1 ):4-5), and excessive flocculation is prone to occur, resulting in increased mud filtration loss and unstable mud performance; and due to the large molecular weight, powdery coating agents tend to form insoluble clumps when dissolved , It takes a long time to completely dissolve, and the speed is slow, which seriously affects the construction progress
Polymers with relatively low molecular weight have a short dissolution time and can meet the requirements of on-site operations, such as the ULTRACAP products of foreign Microbar companies, but they are expensive and used in large quantities, resulting in high drilling fluid costs
On the other hand, there are a large number of silanol groups on the surface of shale, drilling cuttings and clay, and the molecular structure of general polyacrylamide coating agents lacks groups that can interact with them, and the coating inhibition effect needs to be further strengthened

Method used

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  • Instant-dissolved cationic polyacrylamide capsulation agent and preparing method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The first monomer acrylamide 27.00g, the second monomer acryloyloxyethyl dimethyl benzyl ammonium chloride 15.75g, the third monomer hydroxyethyl methacrylate 2.25g, sodium persulfate 0.09g and distilled water 45.00g, stir to make its aqueous solution completely dissolve; add emulsifier sorbitan monostearate 1.80g, kerosene 898.20g in the reactor, add above-mentioned aqueous solution after mixing and dissolving completely; Then dissolve 0.09g sodium bisulfite Put 10.00g of distilled water in a constant-pressure dropping funnel; pass in inert gas nitrogen and keep it for 30 minutes; then start to add aqueous sodium bisulfite solution dropwise, and complete the dropwise addition within 15-25 minutes; keep the nitrogen atmosphere at 45°C After stirring and reacting for 4 hours, add the polymerized emulsion dropwise to the ethanol solution, and at the same time stir at a high speed to precipitate the polymer. After suction filtration, the granular product is washed with acet...

Embodiment 2

[0027] The first monomer sodium acrylate 17.00g, the second monomer dimethyl diallyl ammonium chloride 2.60g, the third monomer hydroxyethyl methacrylate 0.40g, ammonium persulfate 0.001g and distilled water 160.00g, Stir to make the aqueous solution completely dissolve; add 16.00 g of emulsifier sorbitan trioleate and 784.00 g of white oil into the reactor, and add the above aqueous solution after mixing and dissolving completely; then dissolve 0.001 g of pentaerythritol in 20.00 g of distilled water and place In the constant pressure dropping funnel; pass inert gas nitrogen and keep it for 30 minutes; then start to drop pentaerythritol aqueous solution, and drop it within 15-25 minutes; keep the nitrogen atmosphere, stir and react at 60°C for 6 hours, and then polymerize The final emulsion is added dropwise to the ethanol solution, while stirring at a high speed to precipitate the polymer. After suction filtration, the granular product is washed with acetone several times, an...

Embodiment 3

[0030] The first monomer acrylamide 48.38g, the second monomer methacryloxyethyltrimethylammonium chloride 26.25g, the third monomer hydroxypropyl methacrylate 0.37g, potassium persulfate 0.075g and distilled water 160.00g, stir to make its aqueous solution completely dissolve; add emulsifier polyoxyethylene sorbitan monostearate 7.50g, cyclohexane 742.50g in the reactor, add above-mentioned aqueous solution after mixing and dissolving completely; Then add 0.075g Tetramethylethylenediamine was dissolved in 15.00g of distilled water, placed in a constant pressure dropping funnel; inert gas nitrogen was passed through, and kept for 30 minutes; then tetramethylethylenediamine aqueous solution was added dropwise, within 15-25 minutes After the addition is complete; maintain a nitrogen atmosphere, stir and react at 50°C for 4 hours, add the polymerized emulsion dropwise to the ethanol solution, and stir at a high speed at the same time to precipitate the polymer. After suction filtr...

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Abstract

The invention belongs to the field of cationic polymer capsulation agents, and relates to an instant-dissolved low-molecular-weight polyacrylamide capsulation agent and a preparing method thereof. The capsulation agent is prepared from three monomers in a copolymerization mode, wherein the first monomer is one of acrylamide and sodium acrylate, the second monomer is one of cationic monomers including dimethyl diallyl ammonium chloride, diethyl diallyl ammonium chloride, acryloxyethyl ethyl dimethyl benzyl ammonium chloride, methacryloyl oxyethyl dimethyl-benzyl ammonium chloride and methacryloyloxyethyl trimethyl ammonium chloride, and the third monomer is one of hydroxyethyl methylacrylate and hydroxypropyl methacrylate. The molecular structures of the monomers contain hydroxyl, the hydroxyl can interact with drilling cuttings, and the capsulation inhibiting performance is improved. According to the capsulation agent, the inverse emulsion polymerization technology is adopted, the aftertreatment technology is simple, the granular product can be conveniently stored for a long time and transported, the dissolving time is short in use, convenience is brought to site utilization, the capsulation inhibiting effect is good, and the performance of a drilling fluid system can be improved.

Description

technical field [0001] The invention relates to an instant cationic polyacrylamide coating agent and a preparation method thereof, in particular to a low molecular weight cationic polyacrylamide coating agent and a preparation method thereof. Background technique [0002] Coating agent is an important component in polymer drilling fluid. The addition of polymer coating agent can prevent clay from dispersing, and its molecules can quickly adhere to the surface of drilling cuttings and clay to play the role of coating and flocculation. And it can also form internal and external mud cakes on the well wall to reduce pressure difference transmission and filtrate penetration. The coating agent can effectively inhibit the hydration and dispersion of drilling cuttings and the well wall, so as to maintain the stability of the well wall, remove useless solid phase, and maintain low solid phase. [0003] At present, the polyacrylamide coating agent used in common oilfield drilling flu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/06C08F226/02C08F220/34C08F2/24C09K8/035
Inventor 庞雨薇袁俊秀朱魁
Owner CHINA PETROLEUM & CHEM CORP
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