Abstract: In order to raise drilling rate in Pre-Caspian Oilfield,Kazakhstan,research on penetration rate has been made according to formation features,including the drilling bit protection with hydraulic thruster,rotary vertical guidance drilling,MWD with bent PDM technique,impregnated diamond bit and high-speed turbine assembly,etc.,troubles such as bit bouncing,well inclination,low penetration rate in limestone formation have been solved,fast drilling rate was obtained in second-spud and third-spud well sections.In eighteen wells,the average ROP was up to 4.54 m/h,103% higher than past drilling rate,or 196.29 days shorter than past drilling cycle time.Field application shows that comprehensive ROP improving technology has been successful,which can raise ROP significantly,and have good economic benefit.So,it can be widely applied in this area.