On June 2, 2025, Roc Oil’s Chuanzhong Project Team marked the safe and efficient completion of drilling six horizontal wells across two well pads in Bajiaochang with the successful finish of operations at the Jiao 110 well pad. Achieved in a mere 110-day construction cycle, this effort involved multiple technical breakthroughs and set new project records. A combined 9,800-meter horizontal section drilled through premium reservoir zones has laid a solid foundation for meeting production enhancement targets.
To meet the 2025 production ramp-up requirements, the team completed the development evaluation and deployment plan for all six wells within just three months. This was accomplished despite significant challenges including severe rig shortages, a tight mobilization schedule, complex local coordination in a new block, cumbersome permitting procedures, and highly variable subsurface formations.
Once drilling commenced, the team faced a series of complex challenges. Sand Body 8, located in a fluvial sedimentary facies transition zone, had sparse offset well control points, leading to high uncertainty in sand thickness and depth. The exceptionally long designed horizontal sections demanded extremely precise trajectory control. Shallow unconsolidated formations presented high lost-circulation risks, while extended open-hole shale intervals posed severe wellbore instability threats. The geology and drilling teams worked closely to overcome these difficulties. They iteratively refined geological models for precise geosteering into the best reservoir zones, innovatively applied quick-connect flow diverters to significantly cut operational time, boosted efficiency through continuous-drilling surveys and scientific analysis of formation drift tendencies, implemented the "Three Precisions" (precision geosteering, precision operations, precision management) model to ensure technical effectiveness, and pioneered green and efficient practices like grid power application and modular material distribution. After 110 days of relentless effort, the team safely completed all six horizontal wells.
This process saw the successful realization of key technical breakthroughs, including safe drilling in unstable formations, rapid single-run drilling through long intervals, efficient open-hole sidetracking, and successful casing running in high-displacement 3D horizontal wells with long open-hole sections. The project also set new records: achieving a 2,470-meter horizontal section, an average Rate of Penetration (ROP) of 52.69 m/h in the second section, a total well depth of 5,622 meters, a horizontal displacement of 4,749 meters, a displacement-to-vertical ratio of 2.43:1, a reservoir penetration rate of 98% for well Jiao 110-8-2H, and a peak total hydrocarbon gas reading of 78.87%.
Completion work for the Jiao 108 well pad is currently in progress. Post-drilling completion and wellsite construction for the Jiao 110 well pad are also advancing rapidly, aiming for production commencement ahead of schedule. This progress is set to inject new momentum into reserves and production growth at the Bajiaochang field.