ABSTRACT
Tight sandstone reservoir core microfractures are relatively developed and brittle, resulting in poor drill ability, a long drilling and completion cycle, and easy collapse of the wall of the well. Improving drilling efficiency is important to accelerating oilfield development. In this paper, principal component analysis and field statistical analysis are combined to optimize the used bit in the target area, determine the type of bit with good use effect, and analyze the optimized bit type. The PEM drilling fluid was evaluated by using high temperature and high-pressure dynamic water loss instruments under simulated drilling conditions, and the PEM system was optimized. The experiment shows that the drilling fluid system can effectively improve the borehole stability and reduce the borehole wall collapse in early development. At the same time, underbalanced drilling is used, and the fluid in the negative pressure formation can enter the hole more smoothly during drilling. According to the monitoring of wellhead returned fluid, we can timely find the underground oil and gas layer and make a judgment, which improves the exploration effect significantly and saves the drilling cost.
