Abstract

Well logging plays a pivotal role in oil and gas industry. Complex wellbore geometry, mechanical obstructions, operational factors, equipment failures with complex lithology poses various technical challenges and risk in planning and execution of logging operations. The most severe risk includes key seating of the wireline cable and differential sticking of the logging tool string during data acquisition. These complications can severely affect operations, resulting in protracted fishing operations and loss of valuable downhole equipment or inability to obtain critical subsurface Petro-physical parameters. The economic consequences of such incidents are significant, with losses potentially running to millions of rupees. This paper presents Logging While Fishing (LWF) as an effective alternative to conventional fishing methods. LWF is a hybrid technique that integrates Pipe Conveyed Logging (PCL) with the cut and thread method, enabling real-time logging during the retrieval of stuck wireline tools. This not only ensures data acquisition but also reduces rig time and overall cost. The paper discusses successful implementations of LWF in three onshore wells located in the AssamArakan Basin. The results demonstrate LWF is an efficient and cost-effective alternative to traditional fishing operations in complex well conditions.