Use of Mud Logging Data in Drilling Performance Analysis

Abstract For a long time the mud-logging companies have provided the driller and drilling engineers with rather sophisticated computer systems for data presentation and some minor data processing, while drilling a well. The computer systems have also been available for office use both with a link to the on-site computers and as a post-processing data system. Several systems are also available for well planning, ie well trajectory planning with or without a torque and drag model connected to the computer programme. Each mud-logging company delivers its own special system for recording and analysing the data. In order to evaluate data from the different service companies and extracting more information about the drilling process there is a need for a general system. A main-frame database system with additional software packages for statistical analysis and torque/drag calculations has been developed. The data from the mud-logging companies may then be read from the received tapes/diskettes and put into the multiwell database structure.