柴达木盆地资源环境科学钻探工程实践与认识

Practice and Theory of Resources and Environmental Scientific Drilling in Chaidamu Basin

摘要:

为应对柴达木盆地资源环境科学钻探工程项目施工地区岩层中固结程度松软、碎脆、富水、易变形、怕冲刷及易溶蚀等特点，钻进中不易采取岩矿心，钻进粘土及淤泥时缩径严重，孔壁不稳定及地层内广泛分布着层间高承压卤水和天然气，极易发生涌水或井喷的问题，机械岩心深孔钻进施工中合理解决岩心采取率低，护孔压井防喷，是确保科学钻探工程顺利实施的关键点。本项目采用专为资源环境科学钻探设计的隔水单动三重管取心钻具，常规钻杆取心；适宜的钻进方法；借鉴石油钻井泥浆压喷护壁工艺和压喷设施及措施。保证了环境科学钻探工程的施工要求和实验要求。

Abstract:

Because of the characteristics of low consolidation degree， fracture， waterbearing， deformation and dissolution； according to the difficult coring， serious diameter reducing， borehole wall unconsolidation， interlayer high confined brine and natural gas in resources and environmental scientific drilling in Chaidamu Basin， it is important to improve coring efficiency and protect borehole wall. The special designed watersealing single action triple pipe coring tools and traditional pipe coring technology were adopted， and petroleum drilling technology and equipment， such as pressure grouting for blowout， were learnt to ensure the construction and experiment requirements of environmental scientific drilling.