石油勘探与开发2018，Vol.45Issue(3)：507-512,6.DOI:10.11698/PED.2018.03.16
适用于连续管钻井的无固相卤水钻井液体系
A solids-free brine drilling fluid system for coiled tubing drilling
摘要
Abstract
There are many problems associated with coiled tubing drilling operations,such as great circulation pressure loss inside pipe,difficulties in weight on bit (WOB) transferring,and high probability of differential sticking.Aiming at these problems,solids-free brine drilling fluid system was developed on the basis of formulation optimization with brine base fluid experiment,which was evaluated and applied to field drilling.Based on the optimization of flow pattem regulator,salt-resisting filtrate reducer,high performance lubricant and bit cleaner,the basic formula of the solids-free brine drilling fluid system was formed:brine + (0.1％-0.2％) NaOH + (0.2％-0.4％) HT-XC + (2.0％-3.0％) YLJ-t + (0.5％-2.0％) SDNR + (1.0％-2.5％) FT-1A + (1.0％-5.0％) SD-505 + compound salt density regulator.Lab evaluation showed that the fluid had satisfactory temperature resistance (up to 150 ℃),excellent cuttings tolerance (up to 25％),and strong inhibition (92.7％ cuttings recovery);Moreover,its lubrication performance was similar to that of all oil-based drilling fluid.The wellbore could be fairly cleaned at annular up-flow velocity of more than 0.8 rn/s if the ratio of yield point to plastic viscosity was kept above 0.5.This fluid system has been applied in the drilling of three coiled tubing sidetracking wells in the Liaohe Oilfield,during which the system was stable and easy to adjust,resulting in excellent cuttings transportation,high ROP,regular hole size,and no down hole accidents.In summary,the solids-free brine drilling fluid system can meet the technical requirements of coiled tubing drilling.关键词
连续管钻井/卤水钻井液/钻井液性能/井壁稳定性/辽河油田Key words
coiled tubing drilling/brine drilling fluid/properties of drilling fluid/borehole stability/Liaohe Oilfield分类
能源科技引用本文复制引用
王晓军,余婧,孙云超,杨超,蒋立洲,刘畅..适用于连续管钻井的无固相卤水钻井液体系[J].石油勘探与开发,2018,45(3):507-512,6.基金项目
国家科技重大专项“深井超深井优质钻井液与固井完井技术研究”(2016ZX05020-004) （2016ZX05020-004）
中国石油天然气集团公司科学研究与技术开发项目“连续管侧钻井技术与装备现场试验”(2015F-2001) （2015F-2001）
