WAYS OF IMPROVING THE ?139.7 MM CASING CUTTING WINDOW SIDETRACK DRILLING CEMENTING QUALITY

The block of Fault block oil and gas field is small and the connection is poor, and the dead area is great, and the casing damage is serious, utilization of the cutting window sidetrack drilling technique can resolve the difficulty of oil field production. The research cutting window sidetrack drilling cementing quality has important significance for improving oil development result, extending the production life of oil well and reducing the cost. Resolve ?139.7mm casing cutting window sidetrack drilling cementing quality problem by improving the performance of completion fluid and slurry, optimizing slurry formulation, adopting casing centralization technique, optimizing tail pipe design, adding annular return pressure technique, reaming technique of open hole section and rotary casing well cementing technique. Since 2000 Zhongyuan Oil Field puts the casing cutting sidetrack drilling technique completely into practice, well completion and well cementing technology gain new development and improvement and obtain good result. The success ratio of the total amount 267 wells is 98.5%, the ratio of both good wellbore quality and good cementing quality is over 80%. Accumulative total production increases 160 000 tons, and the economic beneficial result is remarkable.