热焦化防砂机理分析

热焦化防砂是通过向地层内注入热空气使原油在高温下发生反应从而将地层砂固结的一种防砂新技术.通过对焦化处理后的岩样组成进行组分分析,探讨了原油胶结机理.揭示出氧化作用使原油的部分原生胶质变成沥青质,沥青质受到高度的缩合作用而成为高分子量的苯不溶物.因此适合焦化防砂的油层,其原油必须含有一定量的原生胶质和沥青质.

Analysis of coking mechanism for warm-air coking for sand control

Warm-air coking for sand control is a new technique,which makes the crude oil react with the injected warm-air and split to coke consolidate the formation.The composition analyses of the treated cores indicate that(1)Under high temperature,various complicated chemical reactions occur,most of which are oxidation reactions;(2)The reactions turn some of the maltene and resin into asphaltene,and under high condensation the asphaltene changes into high-molecular toluene-undissolved materials;(3) A certain amount of resin and toluene-undissolved materials in the core is essential to obtain high compression strength;(4)The heavy oil must contain a certain amount of original asphaltene to form a core with high compression strength.