Deep acidification practice in fractured-vuggy carbonate reservoirs

With the deep development of the fractured-vuggy reservoirs in the Tahe oil field, due to multi-round water injection pollution, cracks closing by energy loss, and poor well completion and acidification effects, there are more and more wells in which the far shaft fractures show a poor conducting capacity. Liquid lack seriously restricts oil production. Conventional and large-scale acidifications were applied; however, acid fluids reacted rapidly when they came close to wells, showing a restricted effective range and poor efficiency. A deep acidification technique was implemented, which conducted far channels and showed a good prospect.