Reservoir protection agent for drilling fluid and preparation method thereof

Abstract

The invention discloses an oil layer protective agent for drilling fluid and a preparation method thereof, belonging to the field of oil field chemistry. The oil reservoir protection agent comprises the following components in parts by weight: a bridging body, a filling body, and 2-4 parts of a flow regulator; All coated on the first mixture to obtain, the first mixture includes: 5-30 parts of walnut shell particles, 5-20 parts of coconut shell powder, 10-20 parts of ramie fiber, 5-10 parts of sisal powder; filler Obtained by coating 0.1-0.5 parts of surface modifier on 15-30 parts of calcium carbonate powder. The oil layer protection agent has good compatibility with the drilling fluid, has little effect on the viscosity increase of the mixed system of the oil layer protection agent and the drilling fluid, does not foam, and the mixed system can effectively protect the reservoir.

Description

Oil layer protective agent for drilling fluid and preparation method thereof technical field The present invention relates to the field of oil field chemistry, in particular to a kind of oil layer protective agent for drilling fluid and preparation method. Background technique Reservoir layer protective agent is a kind of reagent including multiple particle size particles, which can effectively accumulate in the reservoir to form tight mud. cake to prevent the intrusion of solid phase particles and filtrate into the reservoir. Usually the reservoir protective agent is injected into the reservoir along with the solid-phase drilling fluid, Drilling fluid is used to flush the well wall. [0003] The related art provides an oil layer protective agent, the oil layer protective agent includes calcium carbonate powder and fibers. Among them, fiber Playing a bridging role, calcium carbonate powder is filled between the fibers and forms a mud cake with the mud in the reservoi...

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Problems solved by technology

[0005] The compatibility between the oil layer protection agent and the drilling fluid provided by the related technology is poor, and the calcium carbonate powder is easy to agglomerate, and the fibers are easy to float. The viscosity of the mixed system increases, which affects the flushing effect of drilling fluid

Moreover, calcium carbonate powder and fibers are easy to carry air, causing air bubbles in the mixed system, which poses a safety hazard

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