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川东石炭系气藏是目前四川气田的主力气藏,但在已探明的地质储量中低渗透储量占有相当比例,动用十分困难,储层改造和气井增产技术是高效开发这类型气藏的重要手段。本文利用静态酸化和动态酸化实验的手段,系统研究了酸与碳酸盐岩储层岩石中各种矿物的化学反应特点,对碳酸盐岩酸蚀孔道的生成机理作了详细分析,提出了碳酸盐岩储层微观酸化“通缝扩喉”的新思路,有助于了解酸岩酸蚀作用机理,改善和提高酸化施工效果。
Carboniferous gas reservoirs in Sichuan Province are the main gas reservoirs in Sichuan gas field at present. However, the low-permeability reserves occupy a considerable proportion in the proved geological reserves and are very difficult to be mobilized. The technology of reservoir modification and gas well stimulation is to efficiently develop such gas reservoirs Important means. In this paper, by means of static acidification and dynamic acidification experiments, the chemical reaction characteristics of various minerals in acid and carbonate reservoir rocks are systematically studied. The formation mechanism of carbonate acidified pores is analyzed in detail. The new idea of microscopic acidizing “stitching and broadening of throats” in carbonate reservoirs helps to understand the acid erosion mechanism and improve and enhance the acidizing effect.