摘要
大庆油田深层勘探储气层在纵深上高度分散,具有层位多、储气层岩石类型多和储层性质多的特点,并具有孔隙度低、渗透率低和储层压力系数低的特征,还具有含水饱和度高、粘土矿物含量较高和温度梯度高的特性。钻井过程中要求钻井液具有较低的密度、较强的井眼稳定性、较高的抗温能力和较好的保护储层能力。对两性离子、硅酸盐、水包油、油包水等钻井液体系在“井眼质量”和“保护储层能力”方面的使用效果进行了对比分析。提出了可逆化转换的油包水钻井液和低固相强抑制复合醇盐水钻井液体系将是大庆油田深井钻井液体系的发展趋势,简述了此2种钻井液体系对大庆油田勘探的适应性和研究重点。
Deep drilling in Daqing Oilfield is very difficult, due to the multiple layers, various rock types and complicated reservoir characteristics, and such features as low porosity, low permeability and low pressure coefficient , as well as the high water saturation, high clay content and high temperature gradient make it more difficult. Drilling fluid of lower density, better hole stability, higher temperature tolerance and better formation protection capacity is required for safe drilling. Comparison and analysis is conducted on such drilling fluid systems as amphoteric ion system, silicon based system, oil-in-water and water-in-oil systems, on their performances of hole stability and formation protection. It is proposed that the reversible water-in-oil drilling fluid and the low-solids polyol brine system will be dominantly used in the deep drilling in Daqing. The two systems are further investigated and studied.
出处
《钻井液与完井液》
CAS
北大核心
2002年第3期35-40,共6页
Drilling Fluid & Completion Fluid
