BY1-2井超高密度欠饱和钻井液工艺技术  

Technology of Ultra-high Density Under-saturated Drilling Fluid in BY1-2 Well

作　　者：徐思旭 孙俊[1] 祝学飞 邱夏 张贤勇 胡强 XU Sixu;SUN Jun;ZHU Xuefei;QIU Xia;ZHANG Xianyong;HU Qiang(CCDC Xinjiang Branch,Xinjiang Co.,Ltd.,Korla 841000,China;CCDC Drilling Fluid Technology Service Company,Chengdu 610051,China)

机构地区：[1]川庆钻探工程有限公司新疆分公司,新疆库尔勒841000 [2]川庆钻探工程有限公司钻井液技术服务公司,四川成都610051

出　　处：《化工管理》2025年第5期128-131,152,共5页Chemical Management

摘　　要：BY1-2井三开241.30 mm井眼使用密度1.70 g/cm^(3)的欠饱和盐水体系钻进至3607.20 m发生高盐高钙盐水溢流及卡钻事故,使用密度2.50 g/cm^(3)压井成功。因置换严重上提密度至2.58 g/cm^(3)保证了接单根、起下钻与钻进安全,中完提密度至2.60~2.62 g/cm^(3)。针对超高密度流变性控制与盐水污染难题,文章提出了由分散型转变为抑制护胶路线,引入多元共聚物降滤失剂、稳定剂降低磺化材料浓度,优选低黏度效应重晶石,工程严格控制套压,起钻与下套管采取“凝胶封闭浆”切断污染源等系列措施解决了超高密度、高固相与流变性、失水造壁性之间的矛盾,实现钻中抗Ca2+5000~5500 mg/L污染性能稳定、黏度在100~155s之间,取得了良好的成效。Well BY1-2 was drilled to 3607.20 m in 241.30 mm hole with an undersaturated brine system with a density of 1.70 g/cm^(3),resulting in high salt and high calcium brine overflow and stuck.The well was killed successfully with a density of 2.50 g/cm^(3).Due to severe displacement,the density is increased to 2.58 g/cm^(3)to ensure the safety of single connection,trip and drilling,and the density is increased to 2.60-2.62 g/cm^(3).In view of the problems of ultra-high density rheology control and brine pollution,the paper proposes to change the dispersing type to the restraining adhesive route,introduce multi-copolymer fluid loss reducer and stabilizer to reduce the concentration of sulfonated materials,select low viscosity effect barite,and strictly control the casing pressure.A series of measures such as“gel sealing slurry”to cut off pollution sources have solved the contradictions between ultrahigh density,high solid phase and rheology,and water-loss wall building,and achieved stable resistance to Ca2+5000-5500 mg/L pollution during drilling and viscosity between 100-155 s,achieving good results.

关 键 词：超高密度钻井液 高盐高钙盐水 抑制护胶 欠饱和盐水 

分 类 号：TE982[石油与天然气工程—石油机械设备]