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Heat resistance and salt tolerance polymer filtrate reducer and preparation method therefor

A technology of fluid loss reducer, temperature resistance and salt resistance, which is applied in the directions of drilling compositions, chemical instruments and methods, etc., can solve the problems of low applicable temperature, high applicable cost and high production cost, and achieve good salt and temperature resistance. Performance, mild and controllable conditions, simple and feasible method

Active Publication Date: 2015-09-23
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the commonly used filtrate reducers such as sodium carboxymethyl cellulose and modified starch have good fluid loss effect and strong salt resistance, but the applicable temperature is low; sulfonated filtrate reducers are added in a large amount, and the applicable cost is high; Copolymer fluid loss additives and polyacrylate fluid loss additives have high production costs and complex production processes, which cannot fully meet the requirements of drilling fluid technology

Method used

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  • Heat resistance and salt tolerance polymer filtrate reducer and preparation method therefor
  • Heat resistance and salt tolerance polymer filtrate reducer and preparation method therefor
  • Heat resistance and salt tolerance polymer filtrate reducer and preparation method therefor

Examples

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Effect test

Embodiment 1

[0022] Add 2g of sodium carboxymethylcellulose into the reactor, then add 20mL of water into the reactor, stir and raise the temperature to 40°C for gelatinization for 20min, add 5g of 2-acrylamide-2-methylpropanesulfonic acid, 20g Stir the sodium acrylate aqueous solution evenly, add 0.2g of potassium persulfate initiator and 0.010g of N,N-methylenebisacrylamide crosslinking agent in turn, react at a constant temperature of 50°C for 4 hours, wash twice with ethanol and distilled water respectively , dried, crushed and granulated to obtain a white powder product.

Embodiment 2

[0024] Add 2g of sodium carboxymethylcellulose into the reactor, then add 20mL of water into the reactor, stir and raise the temperature to 50°C for gelatinization for 30min, add 5g of 2-acrylamido-2-methylpropanesulfonic acid, Stir 25g of sodium acrylate aqueous solution evenly, add 0.3g of sodium persulfate initiator and 0.010g of N,N-methylene bisacrylamide crosslinking agent in sequence, react at a constant temperature of 60°C for 3 hours, wash with ethanol and distilled water twice respectively, Dry, pulverize and granulate to obtain a white powder product.

Embodiment 3

[0026] Add 3g of sodium carboxymethylcellulose into the reactor, then add 25mL of water into the reactor, stir and raise the temperature to 60°C for gelatinization for 20min, add 10g of 2-acrylamido-2-methylpropanesulfonic acid, Stir 30g of sodium acrylate aqueous solution evenly, add 0.4g of potassium persulfate initiator and 0.010g of N,N-methylenebisacrylamide crosslinking agent in sequence, react at a constant temperature of 70°C for 2.5 hours, wash with ethanol and distilled water twice respectively, Dry, pulverize and granulate to obtain a white powder product.

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Abstract

The invention discloses a heat resistance and salt tolerance polymer filtrate reducer. The heat resistance and salt tolerance polymer filtrate reducer is prepared from 1% to 3% of sodium carboxymethylcellulose, 5% to 12% of 2-acrylamide-2-methyl propane sulfonic acid, 10% to 40% of sodium acrylate, 0.2% to 0.5% of initiator and 0.01% to 0.03% of cross-linking agent in percentages by weight in an aqueous solution, wherein the initiator is ammonium persulfate or potassium peroxodisulfate; and the cross-linking agent is N,N-methylene bisacrylamide. The heat resistance and salt tolerance polymer filtrate reducer is good in heat stability, low in cost and high in heat resistance and salt tolerance capacity. The invention also discloses a preparation method of the heat resistance and salt tolerance polymer filtrate reducer adopting a graft copolymerization method in the aqueous solution; and the method is simple, convenient and practicable, the preparation reaction temperature does not exceed 80 DEG C, and the condition is mild and controllable.

Description

technical field [0001] The invention belongs to the technical field of oil and gas drilling, in particular to a temperature-resistant and salt-resistant polymer fluid loss reducer and a preparation method thereof. Background technique [0002] Filtrate reducer is an important drilling fluid treatment agent in the process of oil drilling construction. By forming a dense filter cake, it can reduce the fluid loss of drilling fluid and ensure the smooth progress of drilling operations. With the increase in the demand for oil and gas resources in the world and the depletion of shallow oil and gas resources, the mining depth is getting deeper and deeper, and the number of deep and ultra-deep wells has increased sharply, which puts forward higher requirements for the technology of drilling fluid temperature and salt resistance. [0003] At present, the commonly used filtrate reducers such as sodium carboxymethyl cellulose and modified starch have good fluid loss effect and strong s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035C08F251/02C08F220/58C08F220/06
CPCC08F251/02C09K8/035C08F220/06
Inventor 王红科刘音周振良
Owner BC P INC CHINA NAT PETROLEUM CORP
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