Profile Control Effect and Mechanism Analysis of Fly Ash

摘要

Fly ash is a coal-fired power plant waste. Its main chemical ingredient is aluminum silicate and its exterior appearance is mainly agraphitic glass phase sphere with loose structure and different size, characteristic of a wide source and low cost. In hydrothermal conditions, Holler and Wirsching took the lead to use fly ash and alkaline (NaOH or KOH) in the synthesis of zeolite. Aimed at actual demand of improving the absorption water profile of flooding well, in regards to the blockage of reservoir pore, the article explores the ingredient constitution and technological conditions for part transformation of fly ash into the zeolite under the conditions of hydrothermal condition. The chemical composition and the structural feature of the exterior appearance of the modified fly ash are studied, as are the blocking effect and profile control mechanism, all of which have important application value to improve the blocking effect and increasing oil recovery.