Key Technology of Drilling Trajectory Control by Rotary Steering in the Shallow Unconsolidated Formation of Bohai

Abstract:

Rotary steering tools are widely used in Bohai oilfield. Because of the instable built-up rate, screw motor drilling tools are generally adopted at the shallow formation drilling, and then rotary steering drilling tools are used instead. When with the screw motor drilling tools, slide steering efficiency is low; on the other hand, it will take 12～15h to trip out for the drilling tools replacement. If the rotary steering drilling tools are used from the very beginning without tripping out for drilling tools replacement, the operation efficiency will be greatly improved. By the technical measures of directional well trajectory optimization, selecting rotary steering tools by comparison and drilling fluid performance optimization, rotary steering drilling technology has been successfully applied in the shallow unconsolidated formation of Bohai.