关键词:  元坝地区, 深层, 致密砂岩, 储层改造, 压裂 

Abstract:  The terrestrial sandstone reservoirs in Yuanba area are characterized by deep burial, tight sands, complex lithology, high pressure, high temperature, strong heterogeneity, thinpayzones, and generally low gas saturation. Though economic gas production is usually obtained after reservoir stimulation, most gas wells are difficult to stimulate and shows low production after fracturing. In this paper the key points of deep tight sandstone fracturing are analyzed through deep understanding of the reservoir. Combined with the previous theoretical exploration and field practice, a set of fracturing technology suitable for deep tight sandstone gas reservoirs in northeastern Sichuan is built, focusing on solving the problem of high operation pressure, ensuring low damage during fracturing, which has improved the fracturing scale, and effectively promoted the exploration work in the region. It also has important reference significance for similar fracturing in deep tight sands.

Key words:  , Yuanba area, deep formation, tight sand, reservoir stimulation, fracturing