The strategic abandonment of inactive wells is crucial for maintaining the integrity of oil and gas field operations. In 2019, prior to full scale introduction of JX Well Integrity Management System（JX WIMS）, we assessed the integrity of all wells under our operational management. This assessment revealed that within Nakajo Oil & Gas Field, there was a legacy well at a high risk for well integrity issues, which had already shown signs of potential failure. In response to this finding, a plan was established to abandon this legacy well along with other inactive wells in the field.
This paper presents a case study of a specific legacy well that was abandoned in Nakajo Oil & Gas Field during the fiscal year 2023. We detail the methodology employed, the technical and operational challenges encountered, and the solutions implemented to effectively mitigate well integrity and safety risks. The successful abandonment of this legacy well serves as a demonstration to our commitment to environmental safety and project health. It also provides valuable insights into the best practices for legacy well abandonment, reinforcing the importance of regular well integrity assessments to preemptively address potential risks.
