The enhanced cooling performance caused by ellipse-shaped tabs located at the outlet of the film cooling holes is conduc......

低渗气藏典型高研磨性地层具有埋藏深、岩石致密、砂泥岩互换频繁、研磨性强、可钻性差、石英含量高的特点，常规PDC钻头在此类地层......