JAPEX drilled a multilateral, multi-layer completion well in the Katakai gas field in 2022 – 2023. Following this well, JAPEX drilled a deep horizontal well at the same field in 2023 – 2024. These wells were intended to enhance the value of a single well by performing two-section completion and extending the production zone with a highly deviated well pass. From a drilling technology perspective, this was a challenging well operation even for our operations in the same field. However, by solving various challenges（wellbore stability, vibration and differential sticking while drilling, etc.）, we achieved for the first time to drill a deep high-deviated well to the planned depth in the same field. This paper will focus on the operations in the horizontal 8-1/2″ hole section.
