| Autor: |
N. Kongpat, K. Olutimehin, M. Vinaipanit, G. Segret, Shameed Ashraf, Salim Taoutaou, J. A. Vargas Bermea, J. Asawakowitkorn |
| Rok vydání: |
2015 |
| Předmět: |
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| Zdroj: |
Day 3 Thu, March 19, 2015. |
| DOI: |
10.2118/173065-ms |
| Popis: |
Cementing design and execution is key to achieving zonal isolation for safe and economic well production. The critical goal of long-term well integrity is a fundamental element of any well construction strategy especially when the well will be subject to cyclic loads and changing downhole stresses e.g from stimulations operations. Exploration and appraisal wells pose an additional challenge because many formation-specific parameters relating to the field may not be fully understood. This case describes the use of self-healing cement and flexible and expandable cement to optimize isolation and ultimately, well delivery on a critical exploration well project for a National Oil Company. Globally, self-healing cements have been increasing used in the last decade and this was the first application for this operator onshore Thailand. The self-healing cement system was used as a secondary barrier in the well in the case of cracks or deformation within the primary cement matrix. The combination would serve as a more robust solution to mitigate the impact of stresses generated during different well lifecycle phases. The design principle of self-healing cement is the ability to swell upon contact with hydrocarbons to restore well integrity. Upon installation in the well, cement evaluation logs and the physical indications showed that zonal isolation had been completely achieved for the entire production interval. In addition, no sustained casing pressure was experienced after the hydraulic fracturing operations were performed. Health, Safety & Environment (HSE) concerns were addressed ensuring no hydrocarbon gas leak to surface and no contamination of underground water zones. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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