Temperature-resistant and salt-resistant polymer fluid loss reducer and preparation method thereof

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 petroleum and natural gas drilling, and particularly relates to a temperature-resistant salt-resistant polymer fluid loss reducer and a preparation method thereof. Background technique [0002] Fluid loss reducer is an important drilling fluid treatment agent in the oil drilling construction process. By forming a dense filter cake, it reduces the fluid loss of the drilling fluid and ensures the smooth progress of the drilling operation. With the increase in demand for oil and gas resources in the world and the depletion of shallow oil and gas resources, the depth of exploitation is getting deeper and deeper, and the number of deep and ultra-deep wells has increased sharply, which puts forward higher requirements for the temperature and salt resistance of drilling fluid technology. [0003] At present, although the commonly used sodium carboxymethyl cellulose and modified starch filtrate reducers have good fluid ...

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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

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