A kind of preparation method of polymer fluid loss reducer for oil-based drilling fluid

Abstract

The invention discloses a preparation method of a polymer filtrate loss reducer for oil-based drilling fluid. The preparation method comprises the following steps: (1) adding methanol and deionized water in a three-necked flask to stir for 20 minutes for uniform mixing; (2) adding polyvinyl pyrrolidone as a dispersant in the step (1), simultaneously introducing nitrogen and performing magnetic stirring under a room temperature for dissolution; (3) respectively adding acrylamide and octadecyl methacrylate in the step (2), uniformly stirring, then adding azo diisobutyronitrile as an initiator, putting in a water bath kettle to uniformly increase the temperature to 70 DEG C, starting timing reaction for 5 hours and simultaneously adding divinyl benzene as a cross-linking agent during different reaction time periods; (4) after the end of reaction, cooling to a room temperature, washing with absolute ethyl alcohol, then performing vacuum drying and finally obtaining the polymer filtrate loss reducer for the for oil-based drilling fluid. The polymer filtrate loss reducer prepared by the preparation method disclosed by the invention can be well dispersed in diesel fuel and simultaneouslyhas the ability to assist in the emulsification, thereby improving the comprehensive performance of a drilling fluid system.

Description

technical field [0001] The invention relates to the technical field of fluid loss control agents, in particular to a preparation method of polymer fluid loss control agents for oil-based drilling fluids. Background technique [0002] In recent years, due to the fact that the development of oil in the middle and shallow formations has been unable to meet the needs of the society, oil and gas exploration and development have continued to develop into deep formations, and the scale of shale gas exploration has expanded, the advantages of oil-based drilling fluids have become more and more prominent. research has become a hot topic. During the drilling process, because the filtrate invades the formation, it will cause various downhole complex situations such as well wall instability, and at the same time increase the drilling cost, so it is very important to improve the performance of the drilling fluid, and the performance of the drilling fluid mainly depends on Development an...

AI Technical Summary

Problems solved by technology

After investigation, it was found that the fluid loss reducers used in oil-based drilling fluids at home and abroad are mainly humic acid and oxidized asphalt. The addition of oxidized asphalt to the drilling fluid system will seriously affect the rheology of the system and the reduction of humic acid. Excessive addition of fluid loss agent in the drilling fluid system has become a recognized problem. Therefore, a new type of treatment agent with high temperature resistance, little impact on the rheology of the drilling fluid system, and fluid loss reducing performance has been developed to meet the requirements of modern drilling. The development of technology needs is very necessary

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