Successful open hole wireline logging to 79° deviation in UAE

An operator in Abu Dhabi wanted to log an Array Sonic in a 8.5” open hole well which featured an 800ft, 79° tangent section. The preference was to complete the logs on wireline and to avoid pipe conveyance, there by improving data quality and rig efficiency. Traditional methods of centralizing the Sonic tools using powered calipers, standoffs, bowspring centralizers etc. cause drag and make it impossible for a toolstring to descend to high deviations by gravity. By replacing the traditional centralizing accessories with Tool Taxis, the toolstring was able to descend effortlessly to 79°. Further details of this technique can be found in SPE-192876-MS. Fig.1. Well Trajectory Tool Taxis successfully convey an Array Sonic to 79° deviation in open hole Fig.2. Array Sonic tool with high-drag traditional centralizing equipment (top) with low-drag Petromac equipment (bottom)