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Polyacrylamide coating agent for water-based drilling fluid, and preparation method thereof

A polyacrylamide and water-based drilling fluid technology, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as insufficient mud stability, excessive flocculation, difficult to dissolve clumps, etc., and achieve coating inhibition Excellent performance, easy industrialization, and mild reaction conditions

Inactive Publication Date: 2016-04-20
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 rise 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 insufficient mud stability; and due to the large molecular weight, particles or powdery coating agents tend to form mutually insoluble particles when they dissolve Agglomerates, it takes a long time to completely dissolve, and the speed is slow, which seriously affects the construction progress
At the same time, 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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  • Polyacrylamide coating agent for water-based drilling fluid, and preparation method thereof
  • Polyacrylamide coating agent for water-based drilling fluid, and preparation method thereof
  • Polyacrylamide coating agent for water-based drilling fluid, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Add 60.00 g of the first monomer acrylamide, 35.00 g of the second monomer acryloyloxyethyl dimethyl benzyl ammonium chloride, 5.00 g of the third monomer (q=1), and 0.005 sodium persulfate into the reactor. g and 900.00 g of distilled water, mechanically stirred to dissolve completely; 0.005 g of sodium bisulfite was dissolved in 100.00 g of distilled water, and placed in a constant pressure dropping funnel; 30 minutes; then start to add sodium bisulfite aqueous solution dropwise, and the dropwise addition is completed within 15-25 minutes; keep the nitrogen atmosphere, stir and react at 10°C for 6 hours, discharge the material, and dry in a vacuum oven at 60°C After 24 hours, the low molecular weight cationic acrylamide coating agent was obtained after pulverization.

[0025] According to GB17514-1998, its molecular weight is 188.5×10 4 g / mol.

Embodiment 2

[0027] Add 382.50g of the first monomer sodium acrylate, 45.00g of the second monomer methacryloxyethyl dimethyl benzyl ammonium chloride, 22.50g of the third monomer (q=5), persulfuric acid into the reactor 0.90g of ammonium and 900.00g of distilled water, mechanically stirred to dissolve completely; 0.90g of pentaerythritol was dissolved in 100.00g of distilled water, and placed in a constant pressure dropping funnel; Minutes; then start to add pentaerythritol aqueous solution dropwise, and the dropwise addition is completed within 15-25 minutes; keep the nitrogen atmosphere, stir and react for 1 hour at 35°C, discharge the material, dry in a vacuum oven at 60°C for 24 hours, and pulverize Finally, a low molecular weight cationic acrylamide coating agent is obtained.

[0028] According to GB17514-1998, its molecular weight is 20.9×10 4 g / mol.

Embodiment 3

[0030] Add 240.00 g of the first monomer acrylamide, 58.50 g of the second monomer dimethyl diallyl ammonium chloride, 1.50 g of the third monomer (q=3), and 3.00 g of cumene hydroperoxide into the reactor g and 900.00g of distilled water, mechanically stirred to dissolve completely; 3.00g of ferrous chloride was dissolved in 100.00g of distilled water, and placed in a constant pressure dropping funnel; at 2°C, pass inert gas nitrogen into the aqueous solution to keep 40 minutes; then start to add ferrous chloride aqueous solution dropwise, and the dropwise addition is completed within 15-25 minutes; keep the nitrogen atmosphere, stir and react for 4 hours at 20°C, discharge the material, and dry it in a vacuum oven at 60°C After 24 hours, the low molecular weight cationic acrylamide coating agent was obtained after pulverization.

[0031] According to GB17514-1998, its molecular weight is 93.4×10 4 g / mol.

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Abstract

The present invention belongs to the field of cationic polymer coating agents, and particularly relates to a low molecular weight cationic polyacrylamide coating agent for a water-based drilling fluid, and a preparation method thereof. The coating agent is formed by copolymerizing three monomers, wherein the first monomer is one selected from acrylamide and sodium acrylate, the second monomer is one selected from a cationic monomer dimethyl diallyl ammonium chloride, diethyl diallyl ammonium chloride, acryloyloxyethyl dimethyl benzyl ammonium chloride, methyl acryloyloxyethyl dimethyl benzyl ammonium chloride and methyl acryloyloxyethyl trimethyl ammonium chloride, the third has the following structure, q is 1-5, and the molecular structure of the third monomer contains silanol, and can occur strong interaction with drilling chips and the like so as to enhance the coating inhibition property. According to the present invention, the aqueous solution polymerization is used, the process is simple, and the operation is easy; and the coating agent is used for the water-based drilling fluid, is easy to dissolve, is easily used on the site, provides a good coating inhibition effect, and can improve the performance of the drilling fluid system.

Description

technical field [0001] The invention relates to a polyacrylamide coating agent for water-based drilling fluid 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 commonly used o...

Claims

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Application Information

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IPC IPC(8): C09K8/035C08F220/56C08F220/34C08F220/06C08F226/02C08F230/08
Inventor 庞雨微袁俊秀朱魁
Owner CHINA PETROLEUM & CHEM CORP
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