Required by geology or reducing drilling cost by using wells drilled, 3D sidetracking wells are getting more and more, 3D sidetracking wells are increasingly important in oilfield development.

• 地质要求或利用已钻井眼降低钻井成本,使三维侧钻井不断增多,三维大斜度侧钻井在油田开发中越来越重要。