Publications

This paper presents the outcomes of reactivating idle and cyclic wells in Medco E&P Natuna Ltd.'s B Field, addressing the rising demand for gas production. The project focused on six wells, four in the WHP-1 area and two in the WHP-2 area, identified as candidates for reactivation after a comprehensive screening process. The reactivation strategy combined various intervention techniques, including hydraulic workovers, cement packer installations, fishing operations, and perforation of shallow gas zones for in-situ gas lift. A key innovation in the project was the introduction of the Bull Heading Reverse Circulation (RC) technique, applied to optimize cementing operations. This technique allowed for significant cost savings, reducing the need for coiled tubing units and achieving a 55% cost reduction.

Furthermore, perforating shallow gas zones in the WHP-1 area alleviated issues related to liquid loading, enhancing production efficiency. The strategy also addressed potential risks associated with perforating shallow zones in a field where multiple wells were producing from the same reservoir. Despite these challenges, the reactivation project resulted in an initial gas production increase of approximately 41 MMSCFD (7,800 BOEPD). Additionally, the project achieved a 28-83% reduction in operational costs compared to initial projections.

The successful application of innovative technologies, such as the Bull Heading RC technique and shallow zone perforations, along with a systematic and cost-efficient intervention approach, demonstrates the effectiveness of reactivation efforts in offshore gas fields. The results highlight the importance of strategic well management, operational flexibility, and cost optimization in maximizing hydrocarbon recovery. This case study offers valuable insights for optimizing well intervention strategies in offshore gas production, providing relevant lessons for the industry.