Study on the Technology for Increasing Drilling Rate in Deep Well at KQT Structure

Due to the complex situations of formation pressure systems and geological lithology below 3 500~4 500 m well section at KQT Structure, complex situations occurred frequently during drilling, affecting seriously on drilling effciency and the acquisition quality of geological data. In this paper, based on the data from wells drilled in KQT structure, the deep well drilling data below 3 500 m has been analyzed, statistical analysis on the formation pressure distribution has been conducted. In addition, the location of complex reservoirs and the reservoir characteristics have been made clear, and the well structure has been designed for deep wells. Based on the study results, further analysis of the advantages and disadvantages of the existing drilling fluid has been conducted and suggestion on optimization has been put forward. In addition, analysis on rock drillability has been conducted, the usage situation of the existing drill bit has been summarized, and some improvement suggestions have been put forward. Finally, statistical analysis has been conducted on the drilling tools for improving drilling rate in KQT structure, and the most effective drilling tools has been found. Based on the results, the technology scheme for increasing deep drilling rate has been made, which can be used for guiding the feld operation.