Coiled Tubing Operation and the Use of Non-Azimuthal Inversion of Ultra-Slim Multiple Propagation Resistivity

Abstract This paper explores the challenges and advancements in under-balanced coiled tubing drilling (UBCTD) operations for gas reservoirs, focusing on the use of non-azimuthal inversion of ultra-slim multiple propagation resistivity tools. The primary goal is to enhance geosteering capabilities and optimize well placement within gas sweet spot layers. Emphasis is placed on determining the distance of detection (DOD) and formation dip to achieve successful drilling of coiled tubing gas wells. We review existing geosteering and monitoring technologies, with a focus on non-azimuthal inversion techniques for ultra-slim multiple propagation resistivity tools. The inversion process allows for better detection of formation dip and precise determination of DOD in challenging UBCTD environments. The technique is applied in combination with other technologies such as gamma ray measurements, cutting analysis, and real-time surface data to form a comprehensive approach. These methods are integrated to provide accurate and reliable data that support optimal lateral placement and efficient gas reservoir navigation. The non-azimuthal inversion technique demonstrated significant advantages in determining DOD and accurately identifying formation dip. These results enable improved steering decisions in real time, ensuring that the coiled tubing is placed within the gas sweet spot layers. The combination of resistivity inversion and other measurement tools proves crucial in overcoming the limitations posed by the small size of the coiled tubing and dynamic hole conditions, ultimately leading to more successful wellbore placement and enhanced gas recovery. This paper introduces a novel approach in the application of non-azimuthal inversion of ultra-slim multiple propagation resistivity to accurately determine DOD and formation dip. By integrating these inversion results with other geosteering technologies, this method improves the efficiency and success rate of drilling coiled tubing gas wells. The integration of these advanced technologies ensures optimal well placement, contributing to better reservoir navigation, increased gas recovery, and improved field development strategies.