江苏油田低渗透敏感性油藏压裂工艺技术

FRACTURING TECHNIQUE FOR LOW PERMEABILITY AND SENSITIVITY RESERVOIR IN JIANG SU OILFIELD

水力压裂是低渗透油藏储层改造的最主要工艺措施之一。针对江苏油田低渗透敏感性油藏 (平均渗透率小于 2 0× 10 -3 μm2 )特点开展了区块整体压裂工艺技术研究 ,优选了适合强水敏油藏的低伤害、低滤失、低摩阻、低残渣压裂液 ;筛选与地层裂缝相适应的支撑剂 ;根据井网布置 ,以经济效益为中心优化裂缝参数 ;防止裂缝向下延伸、封隔器 +填砂的选择性压裂或薄互层的笼统压裂工艺、前置加陶粒降滤工艺等区块整体压裂工艺方案 ,同时在实施过程中全方位的监督和实时数据采集、分析诊断、后评估 ,现场应用后取得明显效果 ,使江苏油田低渗透敏感性油藏采油速度得到大幅度的提高。

Hydraulic fracturing is one of the most stimulations for the low permeability reservoir.The paper introduces the research of the whole block Hydraulic fracturing technique for the low permeability and sensitivity reservoir(K av<20×10 -3μm 2) in JiangSu Oilfield.Simultaneously,select the fracturinq fluid with low damage,low filtrate loss,low friction and small residue suited for the high water sensitivity reservoir and proppant adapted to formation fracture and promote fracture parameters according to pattern arrangement and economic evaluation,and works out whole block fracturing scheme.Through field application,good fractnring effect is obtained.The rate of oil production of low permeability and sensitivity reservoir in Jiangsu Oilfield is greatly improved.