Rotating Liner Cementing Technology for a Directional Well with High Temperature and Low Pressure in Yinggehai Basin

A deep directional Well A15 with typical high temperature and low pressure in Yinggehai Basin of South China Sea has small annular clearance in liner cementing.Using conventional liner cementing method in the well could have such difficulties as poor displacement efficiency,gas channeling,lost circulation,such that good liner cementing quality would hardly be guaranteed.In order to improve the liner cementing quality,rotating liner cementing and high temperature anti-gas channeling cement slurry were used,together with oil based flushing fluid and spacer.By rotating torque and liner centering degree simulation,the Φ177.8 mm liner cementing job in this high temperature and low pressure reservoir has been successfully completed.Sector Bond Tool(SBT)logging proved that Well A15 is highly improved in cement slurry displacement efficiency; with satisfactory cementing quality at gas-water interlayer and perforation intervals,qualified seal of high pressure water layers compared with offset wells cemented by conventional liner cementing method.The successful application of rotating liner cementing has offered a new solution for HTLP deep directional wells in gas field in Yinggehai Basin.