Research on rear sand acid fracturing technology in Tahe oilfield

Tahe oilfield belongs to fractured carbonate reservoirs.After the high acid pressure near wellbore reservoir rock,the remaining compressive strength is insufficient to support the etched fracture and easily creep closed in the production process,and then led to the loss of conductivity.The contribution of acid carrying sand technique diversion capacity,the etched fracture morphology and the presence status of proppant in the etched fracture have been analyzed.Besides,the research on the rear sand acid fracturing technology has been carried out.The technology can solve the etched fracture near wellbore problems,such as fast closure and the loss of conductivity,with smaller investment and convenient site construction.