Quickly dispersed asphalt powder for drilling fluid and preparation method of quickly dispersed asphalt powder

Abstract

The invention relates to an asphalt type plugging anti-sloughing agent for water-based drilling fluid, and in particular relates to quickly dispersed asphalt powder. The quickly dispersed asphalt powder consists of an asphalt component, oil soluble resin, a modifying agent and a separant. The invention further provides a preparation method of the quickly dispersed asphalt powder. The sample obtained according to the invention has high asphalt component content and good water dispersion stability, improves the quality of mud cakes, effectively restrains hydrous swelling of shale, prevents sloughing of a well wall, and has the characteristics of adjustable softening point and applicable temperature. Moreover, the quickly dispersed asphalt powder for the drilling fluid has simple production technique, high production efficiency, low requirement on equipment and environment condition, high operability, stable product performance, and no generation of waste materials and dust.

Description

technical field [0001] The invention relates to an asphalt plugging and anti-slumping agent used in water-based drilling fluid, in particular to an anti-slumping agent of rapidly dispersing (fast-dispersing) asphalt powder for drilling fluid and a preparation method thereof. Background technique [0002] Borehole wall instability is one of the three major technical problems that restrict the smooth progress of drilling projects. It is related to safety, cost and time issues. The main reason is the mechanical instability and hydration expansion of the formation. The anti-slump agent for drilling fluid, also known as shale inhibitor, can effectively inhibit the hydration expansion and dispersion of shale, fill the cracks in the borehole wall, and stabilize the borehole wall. [0003] At present, asphalt materials have always occupied a dominant position in anti-slump agents, but asphalt products will have bonding problems under certain temperature and pressure, resulting in re...

AI Technical Summary

Problems solved by technology

[0004] ① Surface modification of asphalt, such as Chinese patent CN101108963 and US Pat. lead to a decrease in active ingredients;

But the cost is expensive, the process is cumbersome, the energy consumption is high, the product stability is poor, and the transportation is limited

[0007] ④ Composite asphalt powder, after the asphalt is modified into a hydrophilic substance, other release agents are added according to actual needs to reduce the asphalt adhesion problem while improving other performances, increasing the overall performance of the product, and the production process is simple, such as Chinese patents CN200510200458, CN200610106677, CN201010175555 and U.S. Patent US Pat.2003213407A1, but at the same time reduce the actual content of asphalt, the oil solubility rate decreases, the product consumption increases, and the development of low softening point asphalt products cannot be realized

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