塔河油田后置砂酸压技术研究

Research on rear sand acid fracturing technology in Tahe oilfield

塔河油田属缝洞型碳酸盐岩油藏,储层酸压后近井地带的岩石剩余抗压强度不足以支撑酸蚀裂缝,压裂缝在生产过程中很容易蠕变闭合,进而丧失导流能力。分析了酸携砂技术对导流能力的贡献、酸蚀裂缝形态及支撑剂在酸蚀裂缝中的存在状态,并研究了后置砂酸压改造技术。该技术能够很好地解决酸蚀裂缝在近井地带过快闭合而丧失导流能力的问题,且投入少,现场施工方便。

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.