Research and Application of Drilling Speed-up Technology in Yannan Buried Hill Zone of Liaohe Oilfield

Yannan buried hill zone of Liaohe oilfield is located in the east of Liaohe beach sea. The paleozoic, proterozoic and archean are the target strata for oil and gas exploration. The strata in this block are ancient and the geological conditions are complex. Consequently, there are some difficulties in drilling construction such as the formation of buried hill is prone to well leakage and the borehole wall of Mesozoic strata is prone to instability. Besides, the borehole trajectory is difficult to control caused by the large dip angle and the drilling speed is slow due to the hard formation. In order to realize the optimal and fast drilling in this block. the research on drilling speed-up technology has been carried out. The drilling speed increase supporting technology has been formed with the main measures of well structure optimization, drilling fluid system optimization, borehole trajectory control and the application of drilling speed increase tools. The application shows that the speed-up technology developed in this paper can greatly improve the drilling speed, shorten the drilling time and reduce the drilling cost in Yannan buried hill zone.