Emulsified asphalt anti-collapse agent and preparation method thereof

Abstract

The invention discloses an emulsified asphalt anti-collapse agent and a preparation method thereof. The emulsified asphalt anti-collapse agent comprises epoxy resin, a curing agent and emulsified asphalt. The emulsified asphalt anti-collapse agent provided in the embodiment is characterized in that a reaction product with a three-dimensional network structure is generated through reaction of epoxyresin and the curing agent, and then emulsified asphalt is melted in the three-dimensional network structure. Owing to high stability of the three-dimensional network structure, thermal resistance ofthe prepared emulsified asphalt anti-collapse agent can be improved, and accordingly a softening point of asphalt after demulsification of emulsified asphalt can be raised to enable application in high-temperature deep wells. According to tests carried out through an automatic asphalt softening point tester, the asphalt softening point is raised from 60 DEG C to 150 DEG C or above after demulsification of emulsified asphalt, and accordingly the requirement of borehole collapse prevention in an oil drilling process can be met.

Description

technical field [0001] The invention relates to the technical field of oil field chemistry, in particular to an emulsified asphalt anti-collapse agent and a preparation method thereof. Background technique [0002] During the drilling process, in order to avoid phenomena such as wellbore collapse and borehole diameter shrinkage, operators need to use anti-slump agents to fill and block the pores of micro-cracks in the core to prevent water molecules from entering the core, thereby preventing clay from hydrating. The resulting swelling is dispersed, avoiding borehole wall collapse and borehole shrinkage. [0003] In related technologies, emulsified asphalt is usually selected as the anti-slump agent. The particle size distribution of emulsified asphalt is between a few nanometers and tens of microns. The cationic emulsifier is used to make it have a small amount of positive charge, which can be adsorbed in the cracks of the well wall mudstone and on the surface of the well w...

AI Technical Summary

Problems solved by technology

[0005] The commonly used emulsified asphalt is demulsified and fused with each other to form asphalt with a softening point of about 60°C. When the wellbore temperature exceeds 60°C, the connected asphalt will soften and flow, thus losing the effect of plugging the well wall. Cannot be used in deep wells with higher temperatures

Images