High Rate of Drilling Techniques in Exploration Wells in Xihu Trough, East China Sea

Formation lithology character and high formation temperature gradient of Xihu Trough are introduced in the paper, and drilling fluid requirements are put forward based on the analysis of formation characteristics. High rate of drilling techniques and drilling fluid techniques in exploration wells in the area are discussed. Application results in four wells have shown that high rate of drilling techniques and fluid techniques can improve penetration rate, shorten drilling period, and decrease drilling costs,thus great economic benefits are achieved.