Anti-sloughing filtrate reducer white asphalt for drilling fluid

Abstract

The invention discloses anti-sloughing filtrate reducer white asphalt for drilling fluid. The anti-sloughing filtrate reducer white asphalt is prepared by processing the following raw materials in parts by weight: 3-10 parts of mixed particles, 0.3-2 parts of resin filler and 2-7 parts of copolymerization additive, wherein the mixed particles are used for carrying out surface treatment on light calcium carbonate through a silane coupling agent; then adding the light calcium carbonate subjected to surface treatment into a reaction intermediate of high-carbon fatty acid, high-carbon fatty alcohol and polyhydric alcohol and then performing reaction so that the dispersion and combination effects of the modified light calcium carbonate in the liquid-phase mixture are improved; the resin filleris prepared by taking a resin raw material obtained by reaction of styrene and acrylamide as a coating material to coat cross-linked micro-particles, the effects of lubricating and filling large-aperture gaps are achieved, and early-stage filtration loss is reduced; the high-temperature-resistant resin is used for wrapping so that cross-linked particles can be prevented from being distributed on the side wall of a drilled hole in a centralized manner when the drilling fluid is used, and the normal use of the anti-collapse filtrate reducer is not influenced.

Description

technical field [0001] The invention belongs to the technical field of petroleum drilling fluids, and in particular relates to an anti-slump and fluid loss reducing agent white asphalt for drilling fluids. Background technique [0002] Drilling fluid is a general term for various circulating fluids that meet the needs of drilling work with its multiple functions during the drilling process. Drilling fluid is the blood of drilling, also known as drilling flushing fluid. Drilling fluid can be divided into clear water, mud, clay-free flushing fluid, emulsion, foam and compressed air according to its composition. Clear water is the earliest drilling fluid, which requires no treatment and is easy to use. It is suitable for complete rock formations and areas with sufficient water sources , Mud is a widely used drilling fluid, which is mainly suitable for unstable rock formations with loose walls, developed cracks, easy to collapse and drop blocks, swelling and spalling when encoun...

AI Technical Summary

Problems solved by technology

However, with the continuous development of oil extraction technology, the problem of oil and gas layer pollution is gradually recognized by people, and the environmental protection requirements of offshore drilling are getting higher and higher. Previously used asphalt-based anti-slump agents, lignite-based anti-slump agents and other black polluting products Because it does not meet the environmental protection requirements, the toxicity pollutes the environment, and the fluorescence interferes with geological logging, it is no longer allowed to be used, and this kind of anti-slumping agent also has a great impact on the rheological properties of the mud system, is easy to thicken, and has poor anti-slumping lubrication performance.