关键词: 自生酸, 高温, 反应速率, 碳酸盐岩, 酸化

Abstract: There are a series of problems existing in acidizing renovation of carbonate reservoirs in the Sichuan-Chongqing area, such as high temperature, rapid acid-rock reaction rate of ordinary acidizing fluid, limited penetration of acidizing fluid and high corrosion rate. Therefore, using HCl produced under high-temperature reaction as parent fluid, a self-generating hydrochloric acid system is developed for renovation of high-temperature carbonate reservoir. With gas increasing agent used as the main agent, the autogenetic foam acid system is developed, which can produce a large amount of gas under the effect of formation conditions, to solve the problem that the flowback effect of residual acid is satisfactory in acidizing renovation of low pressure gas wells, easily causing secondary damage. The self-generating hydrochloric acid can significantly improve the depth of acidizing treatment in the deep well with temperature of more than 150°C. Autogenetic foam acid can accelerate discharge of acid fluid in the low pressure tight oil and gas wells after acidizing renovation and reduce secondary damage from residual acid. This acid fluid system is used for 22 well/times on the field and increases the output by 511.1×10⁴m³/d, achieving good economic results.

Key words: self-generating hydrochloric acid, high temperature, reaction rate, carbonate rock, acidizing