压裂防砂技术在胜利油田低渗敏感稠油油藏的应用

Application of fracturing sand control technology in low permeability sensitive heavy oil reservoir of Shengli Oilfield

为进一步提高低渗敏感稠油油藏开发效果,胜利油田引进了压裂防砂技术。利用有限元模拟方法定量分析了压裂防砂技术增产及防砂的内在机理,明确了该技术对低渗敏感稠油油藏具有较强适应性;开展了压裂防砂施工工艺优化,确定最优造缝长度为70 m,优选0.425-0.850 mm陶粒作为支撑剂,合成聚合物压裂液作为施工用液,前置液用量比为35%-45%。2013年压裂防砂技术在胜利油田草13区块现场试验15井次,油井投产初期平均单井日产油5.4 t,与挤压充填防砂井日产油相比,单井增产1.8倍,能够很好地满足现场要求。压裂防砂技术对于低渗敏感稠油油藏具有较强的针对性和适应性,可为该类油藏高效开发提供新的技术支持。

In order to improve the development effect of low permeability sensitive heavy oil reservoirs in Shengli Oilfield,fracturing sand control technology is introduced.In this article,first,the increasing production effect of fracturing sand control technology and sand control inherent mechanism were analyzed by means of finite-element simulation.Second,fracturing sand control process was optimized.Optimization results are as follows： the optimum fracture length is 70 m,the best proppant is 0.425 ￣0.850 mm ceramic,the optimized liquid is synthetic polymer fracturing fluid,and the optimized prepad fluid usage is 35%-45%.Third,field test of 15 wells in Cao-13 Block in Shengli Oilfield is carried out.The average oil output is 5.4 t/d per well,which is 1.8 times as much as squeeze packing sand control method,which meets field demand.The study shows that fracturing sand control technology is targeted and suitable for the low permeability sensitive heavy oil reservoirs in Shengli Oilfield,which provides new technology support for this kind of reservoir.