Comb-like polymer fluid loss additive for drilling fluid and preparation method thereof

Abstract

The invention provides a comb-like polymer fluid loss additive for drilling fluid and a preparation method thereof. The preparation method comprises the following steps of: performing esterification on polyethylene glycol monomethyl ether (PEGM) and maleic acid (MA) to obtain macromonomers; and adding two monomers, namely acrylamide (AM) and 2-acrylamido-2-methylpropanesulfonic acid (AMPS) into the macromonomers to perform copolymerization so as to obtain the comb-like polymer fluid loss additive with a long side chain by a solution polymerization method. The prepared comb-like polymer fluid loss additive has the advantages of resisting the temperature of 200 DEG C in the drilling fluid, along with good fluid loss reducing effect on the drilling fluid such as fresh water, saline and the like, capacity of controlling the drilling liquid to keep high rheological property under the condition of high temperature and high salinity, high temperature and salt resistance, stable fluid rheological property, mild synthesis condition, low equipment requirement and simple process.

Description

technical field [0001] The invention relates to a heat-resistant and salt-resistant fluid loss reducer in the oil drilling process and a preparation method thereof, belonging to the technical field of the fluid loss reducer. Background technique [0002] With the increasing demand for oil in modern society, the difficulty of oil exploration and development is also increasing. Now, the exploitation of oil and natural gas in the world has begun to show a trend of developing towards deep land, harsh environment areas and oceans. [0003] In order to achieve safe and rapid drilling operations and high comprehensive benefits, it is necessary to improve the performance of drilling fluid so that it can maintain or basically maintain its original performance under high temperature, high pressure, and high density conditions. As a drilling fluid additive, fluid loss reducer plays an important role in drilling operations. Its research direction is mainly divided into two aspects: th...

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Problems solved by technology

[0006] The invention aims at the deficiencies of existing fluid loss reducers for drilling fluids, such as poor temperature and salt resistance and fluid rheological stability, and provides a comb-type drilling fluid with good temperature and salt resistance and stable fluid rheology. A polymer fluid loss control agent, and at the same time provide a preparation method of the comb-shaped polymer fluid loss control agent with mild synthesis conditions, low equipment requirements and simple process

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