钻井液与完井液2024，Vol.41Issue(3)：383-389,7.DOI:10.12358/j.issn.1001-5620.2024.03.014
水不分散材料对水泥浆抗水侵性能影响
Effect on Water-Resistant Cement Slurries by Materials Non-Dispersible in Water
摘要
Abstract
In the Chuanyu area,the shale gas producing Jialingjiang Formation is developed with plenty of fractures and formation water.This leads to a mud loss problem which greatly prolongs the drilling time and hinders the safe and efficient development of the shale gas.Cement slurries non-dispersible in water have been studied to deal with the mud loss problem encountered in the shale gas drilling.By evaluating the water non-dispersibility of five polysaccharide polymers and organic polymers,key materials and their quantity ratio are selected,and a low-density cement slurry non-dispersible in water is formulated for cementing water-bearing loss zones.In well cementing with this cement slurry,pressure balance loss control technique was used,and the cement slurry,after being displaced into the well,is not displaced and washed away by the formation water from the loss zones,hence realizing effective sealing of the loss zones and paving the way for subsequent operations.This low-density water non-dispersible cement slurry has been successfully used in cementing the well Z203H6-X drilled in the Chuanyu area,the equivalent circulating density(ECD)of the formation into which mud has been lost is increased from 0.99 g/cm3 to 1.21 g/cm3.In subsequent operations lost circulation slurries were used to enhance the compressive strength of the formation,and the ECD of the formation was further increased to 1.81 g/cm3.This cement slurry has provided a technical means to solve the lost circulation problem encountered in drilling the fractured water-bearing formations in shale gas drilling in the Chuanyu area.关键词
水不分散水泥浆/含水裂缝层漏失/当量密度/多糖/高分子聚合物/页岩气井Key words
Water non-dispersible cement slurry/Loss into water bearing fracture/Equivalent density/Polysaccharide/High molecular weight polymer/Shale gas well分类
能源科技引用本文复制引用
焦亚军,张华,郭雪利,张晓兵,刘波,邓天安,张顺平..水不分散材料对水泥浆抗水侵性能影响[J].钻井液与完井液,2024,41(3):383-389,7.基金项目
国家自然基金基础科学中心项目"超深特深层油气钻采流动调控"(52288101) （52288101）
中国石油重点课题"超深特深层油气钻完井井筒工作液流动调控研究"(2023DQ0529) （2023DQ0529）
中石油工程院基金项目"盐穴压缩空气/氢气储能钻完井关键技术研究"(CPET202317). （CPET202317）
