Use Of The Drill Pipe Electric Log Available to Purchase

This paper presents various uses for the Drill Pipe Electric Log. A brief explanation of the equipment and its operation is described. Unique applications are discussed including its use on trouble wells, correlation in difficult areas and as a means of abnormal formation pressure determination. Multiple log runs become feasible with the economy of the Drill Pipe Electric Log. This can be quite significant on exploration wells. It has been demonstrated that log characteristics over a given interval may change with time and continued drilling. When multiple log runs are made, the characteristics at the time of each log run are known. Excessive filtrate invasion, saltwater flow or invasion by whole muds are a few of the conditions that may have altered a zone's log features to the point of masking a potential pay. Another feature of multiple log runs presented is its use in establishing the protective casing point prior to encountering an abnormally pressured sand. Recent publications have explained the use of electric logs in determining formation pressures. Because the characteristic decrease in shale resistivity may be quite abrupt and also because correlation between wells may change drastically, it is important to make several log runs to determine the protective casing point. The economics of using the Drill Pipe Electric Log are presented by comparing its cost with the standard Induction-Electric Log in a hypothetical situation. Example logs are included with several pertinent illustrations. Limitations of the services are also listed.