A kind of oil-based drilling fluid cutting agent and preparation method thereof

Abstract

The invention provides an oil-based drilling fluid extracting and cutting agent and a preparation method thereof. The method comprises the following steps: maleic anhydride and styrene are subjected to a polymerization reaction under existence of a solvent and an initiator to obtain a mixture; the obtained mixture is subjected to a reaction under existence of an alcohols compound and a catalyst to obtain an extracting and cutting agent crude product; and the obtained extracting and cutting agent crude product is subjected to removal of an organic solvent, and then is dried and crushed to obtain the oil-based drilling fluid extracting and cutting agent. The oil-based drilling fluid extracting and cutting agent has a long straight chain alkyl group and contains a lot of polar groups, net structures are formed by the long chain alkyl group in an oil-based drilling fluid through association action, the polar groups in molecules are capable of interacting with other groups through electrostatic attraction or hydrogen bond, so that the net structure with larger specific surface area is formed, and the existence of the net structures effectively increases the dynamic cutting force of the drilling fluid.

Description

technical field

[0001] The invention relates to the technical field of drilling, in particular to an oil-based drilling fluid cutting agent and a preparation method thereof. Background technique

[0002] In the early stage, organoclays were widely used as oil-based drilling fluid shearing agents. However, organoclays are easy to desorb after high temperature, which reduces the solubility rate in oil, reduces the service life of oil-based drilling fluids, and is not conducive to low-permeability storage. layer of protection. Therefore, many scholars at home and abroad have carried out beneficial exploration and research, and developed a variety of oil-based drilling fluid shear lifting agents.

[0003] In 1988, Arvind D Patel added copolymers of styrene-butadiene rubber polymers and amide or amine monomers to conventional oil-based drilling fluids to increase the dynamic shear force of the system. In 1998, Murray Cooperman developed a powdered cutting agent by reacting alko...

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