柴达木盆地冷探1井尾管悬挂器丢手异常固井实践  

Cementing practice with abnormal release of liner hanger in Well Lengtan 1 in the Qaidam Basin

作　　者：费中明 高飞 蒋世伟 孔哲 杨增民 田宝振 FEI Zhongming;GAO Fei;JIANG Shiwei;KONG Zhe;YANG Zengmin;TIAN Baozhen(No.1 Cementing Company,CNPC Bohai Drilling Engineering Company Limited,Renqiu 062552,Hebei,China)

机构地区：[1]中国石油集团渤海钻探工程有限公司第一固井分公司

出　　处：《石油钻采工艺》2020年第5期606-609,共4页Oil Drilling & Production Technology

基　　金：中国石油集团渤海钻探工程有限公司科研项目“青海油田深探井固井关键技术研究”(编号:2020ZD15Y-03)。

摘　　要：冷探1井五开Ø190.5 mm钻头钻至井深5708.5 m,下入Ø139.7 mm尾管,尾管悬挂器经验证不能丢手,固井失败风险加大。同时,固井施工还面临尾管一次封固段长2506 m、上下温差65℃、水泥浆综合性能要求高、水泥浆侵害有机盐钻井液严重、地层存在高压气层、油气上窜速度高难压稳、井控风险高等难题。通过控制过提50 kN、200 kN、300 kN、350 kN、400 kN,上提静停2~3 min,然后下放至原悬重1150 kN,每次动作重复操作3~4次反复丢手验证的方法,顺利拔出了中心管,悬挂器最终丢手成功。采用抗高温防气窜水泥浆体系及先导保护钻井液和抗污染冲洗加重隔离液,确保固井安全,提高固井质量。高温防气窜水泥浆体系浆体流动度大于21 cm,稠化时间在设计范围内且可调,滤失量小于50 mL,游离液为0,沉降稳定性不大于0.02 g/cm3,水泥石抗压强度发展迅速,48 h顶部抗压强度达14 MPa以上,满足深探井油层尾管固井技术要求,确保了冷探1井Ø139.7 mm尾管固井的成功施工。After fifth-sectionØ190.5 mm bit drills to the depth of 5708.5 m in Well Lengtan 1,Ø139.7 mm liner is run into the hole.However,it is verified that the liner hanger cannot be released and the risk of cementing failure is aggravated.And meanwhile,the cementing construction is faced with a series of difficulties,such as long primary cementing section of liner(2506 m),upper-lower temperature difference 65℃,strict requirement on the overall performance of cement slurry,serious encroachment of cement slurry into the organic salt drilling fluid,existence of high-pressure gas layer,fast upward flow and hard pressure stability of oil and gas,and high well control risk.In this paper,it was uplifted and rested for 2-3 min by controlling the over pull of 50 kN,200 kN,300 kN,350 kN and 400 kN and then lowered down to the original hang weight of 1150 kN.And repeated release verification method was performed on each action 3-4 times.In this way,the center pipe was pulled out smoothly and the hanger was eventually released successfully.In addition,the high-temperature anti-gas channeling cement slurry system,the pilot protective drilling fluid and the antipollution flushing weighted spacer fluid were adopted to ensure the cementing safety and improve the cementing quality.The hightemperature anti-gas channeling cement slurry system has the mobility higher than 21 cm,the fluid loss less than 50 mL,the free fluid of 0 and the sedimentation stability lower than 0.02 g/cm3.And its thickening time is adjustable in the design range.The compression strength of the set cement develops fast,and the value at the top reaches over 14 MPa after 48 h.In conclusion,it meets the technical requirements of liner cementing in the oil layers of deep exploration wells and ensures the successful construction ofØ139.7 mm liner cementing in Well Lengtan 1.

关 键 词：深井 固井 探井 尾管悬挂器 丢手 水泥浆 隔离液 有机盐钻井液 

分 类 号：TE256[石油与天然气工程—油气井工程]