Asphalt composition granule suitable for wider temperature drilling and preparation method thereof

Abstract

The invention discloses an asphalt composition granule suitable for wider temperature drilling and a preparation method thereof. The asphalt composition granule comprises the following components by weight percentage: 80wt%-95wt% of a high-softening point asphalt composition, 4.9wt%-15wt% of modified starch and / or water soluble fiber, and 0.1wt%-5wt% of a promoter. Specifically, the high-softening point asphalt composition is a mixture of two or more of high-softening point asphalt with a softening point of 120-220DEG C, and the softening point difference between adjacent high-softening point asphalt ranged according to the softening point from low to high is 5-50DEG C. The promoter is one or several of sulfate, quaternary ammonium salt, or lignosulfonate. The preparation method includes: mixing and crushing the high-softening point asphalt composition, the modified starch, the water soluble fiber and the promoter to obtain the asphalt composition granule. The asphalt composition granule provided by the invention has high softening point and excellent high temperature performance, and can continuously play a part under wide-temperature range drilling operation conditions. And the preparation method is simple, and is convenient to operate.

Description

technical field

[0001] The invention relates to an asphalt composition granule, in particular to a high softening point asphalt composition granule used for oil field drilling and capable of continuously functioning in a wide temperature range, as well as its preparation method and application. Background technique

[0002] With the development of the petroleum industry and the continuous expansion of the drilling field, the application of bitumen-based plugging agents in oilfield drilling has attracted more and more attention. Bituminous plugging agents generally contain water-insoluble bitumen particles and have a certain softening point. When the temperature and pressure in the wellbore are high enough, the asphalt particles soften and deform, and are squeezed into the micro-fractures of the well wall, preventing drilling fluid and filtrate from penetrating through the micro-fractures, and effectively sealing the formation together with the mud cake. Bituminous substance...