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- W2899685989 abstract "Abstract Typically, conventional cores provide indeterminate reservoir condition; suffer loss of unknown volume of hydrocarbon fluid and mechanical integrity while being retrieved. Most laboratory analysis thereafter are simulated however it's not truly turning back the lost conditions into in-situ condition. A fully captured, and pressure retained core is thought to be a solution to provide a true micro-reservoir at surface which explains the reservoir behaviour as it behaves in subsurface. This led to successfully deploying the technology to fully capture a large diameter pressured core for the first time in conventional hydrocarbon industry in Giant Burgan Field in southeast of Kuwait in a Middle Cretaceous Clastic reservoir and also to derive a number of critical parameters from the retrieved micro-reservoir. The technology involves lowering of a large diameter pressure corer (LPC) with an outer pressure vessel and inner core barrel. After the core is cut, a drop ball mechanism sets the inward movement of the inner barrel past a spring activated pressure seal thereby keeping the core in reservoir condition. While continuous pressure recording on the retrieved core, a core analyser (PCAL) system captures multiple sets of reservoir data through a predetermined slow depressurization without hampering any operations on the rig floor. Other than measuring accurate reservoir pressure, the analytical process provided for sampling of released gases, fluids and PVT samples in addition to in-situ bubble point estimation, all at the rig site. The onsite gas analysis with compositional changes during depressurization and bubble point estimation well matched with the subsequent analysis performed on the samples in laboratory. Thus, a real representative Upper Burgan reservoir sand was retrieved containing present reservoir pressure with all fluids retained. Additionally, it provided a nearly undisturbed core with high degree of original mechanical integrity. The final depressurized core is then sent for further laboratory investigations and geological studies including slabbing and plugging. This encapsulated micro-reservoir is less sensitive to unexpected events like delays during retrieval and analysis, avoiding damages of the core or loss of fluids. The technology stands out against systems delivering cores at partial or no pressure retention, as it retrieves cores at formation pressure with all fluids retained and core integrity unaltered." @default.
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- W2899685989 date "2018-11-12" @default.
- W2899685989 modified "2023-10-06" @default.
- W2899685989 title "First-Ever Large Diameter Fully Captured & Retained Pressurized Core and In-situ Analysis with Slow Depressurization - Pilot Case on Giant Burgan Reservoir, Kuwait" @default.
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- W2899685989 doi "https://doi.org/10.2118/193021-ms" @default.
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