双低凝析气藏压裂改造优化设计方法研究  

Fracture Stimulation Treatment Optimization Designin Condensate Gas Reservoirs with Low Porosity and Low Permeability

作　　者：刘淼[1] 张永平[1] 

机构地区：[1]大庆油田有限责任公司采油工程研究院,黑龙江大庆163453

出　　处：《天然气技术与经济》2017年第5期22-24,共3页Natural Gas Technology and Economy

摘　　要：海拉尔呼和湖凹陷凝析气藏是典型的双低气藏,其储层岩性复杂、岩石泥质含量高、地层压力系数低,对于该类储层的压裂增产改造一直是国内外技术攻关难点之一。针对本区以往压裂施工的经验和教训,结合储层特征,形成一套针对双低凝析气藏的压裂优化设计新方法,包括根据储层岩石泥质含量和脆性指数确定"造长缝提高裂缝波及体积"的压裂思路,在此基础上通过分析凝析气藏相态特征、进行以"小级差低砂比长时间加砂工艺"为重点的压裂工艺优化,以及优选"前置增能乳化压裂液"压裂液体系及施工管柱、改进现场控制措施等等。该方法成功应用于HX井压裂改造,单层最大设计加砂量达到102 m^3,为未来该区块的精准勘探开发奠定了基础。The condensate gas reservoir located in Huhehu sunken of Hailaer oilfield is the low porosity and low permeability reservoir.The strong heterogeneity cause the high burst pressure during the fracture operations. The complex reservoir lithology and high shale content lead to clay swelling that reduces fracture fluid efficiency and the width of artifical crack. Moreover, Sand coal interbed could bring the communication between the target stratum and the neighbouring coal layers which produce the sand plug. The low formation pressure coefficient and low flowback ratio of fracturing fluid can inflict huge damage on gas well production owing to the water blocking. Thus, the fracture stimulation on this kind of condensate gas reservoir is a difficult problem all over the world. Based on the analysis of the well history related with the past stimulation operation, a series of modified measures were presented, which includes the optimized of fracturing technology and fracturing fluid system and operating downhole tools. The fracture stimulation operation on HX well is achieved success by application of the new method. The maximum designed sand capacity on one layer reached 102 m^3 brought a large margin of gas production, which received a good effect. This technology has good application effect and promising guidance role in the process of E&D on this kind of gas reservoir in the future.

关 键 词：凝析气藏 大型压裂 优化设计 乳化压裂液 一体化管柱 

分 类 号：TE377[石油与天然气工程—油气田开发工程]