Optimization and Practice of Acidizing in K Oilfield, Kazakhstan

The main problem K Oilfield is the formation degassing and rapid decline in production caused by insufficient formation pressure. The main problems of the early acidizing process in K oilfield are low acidizing intensity, large reservoir thickness and general transformation, resulting in small stimulation radius, uneven vertical transformation of reservoir and low efficiency of measures. In order to improve the transformation effect, it is proposed to increase the acid adding strength to increase the stimulation radius, and adopt the diverting acid process to improve the vertical transformation uniformity of the reservoir. Through practice, it is recognized that increasing the distance between the upper edge of the perforation and the oil and gas interface is conducive to reducing the production gas-oil ratio, but the long-term gas-oil ratio control still needs to supplement the formation energy; Increasing the strength of acid addition and the length of wormhole can effectively increase the yield and improve the effect of stable yield, and the economic benefits are considerable; The long acidizing and acid fracturing drainage period of old wells is related to the remaining oil saturation near the well zone and the insufficient formation energy; Multiple rounds of acidification failed to effectively act on the deep part of the reservoir, and the acidification effect gradually decreased.