Analysis and evaluation of acid re-fracturing treatment effect

To improve the process of acid re-fracturing treatment and its effect, the main factors influencing the acid re-fracturing effect are found out, based on analyzing the construction parameters and the effect of acid re-fracturing in the domestic carbonate reservoirs in the past years. Well selection requirements are proposed. Firstly, the interval should not be too long, and the wells with obvious fractures and cave reservoirs around the well bores are the best. Secondly, it should be cautious to put acid re-fracturing into practice in such wells that obviously produce water after the first time of acid fracturing. Thirdly, it is not suitable to put acid re-fracturing into practice in the wells with obvious connected fractures appeared in the first time of acid fracturing and cave reservoirs and poor fluid supply capacity proved by pilot production. The results obtained can be good reference to the well and interval selection and the construction of the carbonate reservoir acid re-fracturing. 