摘要
松南气田火成岩储层地层压力低,且裂缝发育,在钻井过程中极易发生井漏,降低钻井时效。针对该地区的地质特征与钻井要求,以钻井液的动速比为指标,优选了疏水缔合型两性离子聚合物PAADDC作为携岩剂;通过滤失造壁性能评价实验和压力穿透测试,优选了PB-1和不同粒径的超细碳酸钙构成的钻井液封堵防塌剂;通过堵漏评价实验,优选了中空弹性橡胶、碳酸钙颗粒和中空弹性微珠作为主要随钻堵漏材料。在此基础上研制了低密度低伤害随钻堵漏钻井液体系,并对其性能进行了综合评价。实验结果表明,该钻井液具有良好的流变性和封堵防塌性,防漏堵漏效果良好,酸化解堵效果显著。在腰平16井的现场应用中,钻井液性能稳定,成功解决了火成岩低压储层井漏影响钻井时效问题,满足了现场钻井施工和储层保护的需要。
The igneous rock reservoir in Songnan gas field has low formation pressures and is rich in formation fractures.Time efficiency of drilling operation has been low in this area because of mud losses frequently encountered during drilling.To address this problem,a low solids low damage low density drilling fluid with the ability of controlling mud losses while drilling was formulated based on laboratory experiment.To improve the cuttings carrying capacity of the drilling fluid,a hydrophobic associative amphoteric polymer PAADDC was selected based on the geology and drilling requirement of the gas field.By evaluating the water loss and wall building capacity,as well as pressure penetration property of the drilling fluid,a plugging additive mixed with PB-1 and ultra-fine calcium carbonate of different particle sizes was prepared.A lost circulation material used while drilling was formulated with hollow elastic rubber beads,calcium carbonate particles and hollow elastic micro beads.Evaluation of the drilling fluid shows that this drilling fluid has good rheology,plugging capacity,anti-sloughing ability and capabilities of controlling and preventing mud losses.Use of calcium carbonate makes it easy to minimize formation damage by acidizing job.When used in drilling the Well Yaoping-16,the mud showed stable properties.Mud losses in drilling the low-pressure igneous rocks,which negatively affected drilling time efficiency previously,was successfully resolved.Requirements of drilling operations and reservoir protection were satisfied with this drilling fluid.
作者
刘彦学
LIU Yanxue(Sinopec Northeast Oil and Gas Company,Changchun,Jilin 130062)
出处
《钻井液与完井液》
CAS
北大核心
2019年第4期442-448,共7页
Drilling Fluid & Completion Fluid
关键词
低固相钻井液
随钻堵漏
松南气田
储层保护
应用
Low solid drilling fluid
Control mud loss while drilling
Songnan gas field
Reservoir protection
Application
