Abstract
It was already discussed in Chaps. 7 and 8 that using conventional, non-pressurized coring during tripping, the core may undergo some invasion-related mechanical damage due to the fluid expulsion. This causes some loss of data and inability to recover meaningful core analysis data such as the in situ fluid saturations (inferred from Johns and Lewis 1981; Hyland 1983; Bjorum 2013; Bjorum and Sinclair 2013; Ali et al. 2014; Cerri et al. 2015; Ashena 2017). The capture and characterization of the fluids being expelled out of the core sample during its tripping is a possible solution as it can provide information about the hydrocarbon volume and its properties. To address this issue, pressure/in situ coring has been already introduced in the industry. In this system (combined either with the conventional or wireline operations), at the end of coring, the inner tube assembly containing the core barrel is raised in a closed system to the rig floor, i.e., under its bottom-hole pressure.
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Ashena, R., Thonhauser, G. (2018). Pressure/In Situ Coring. In: Coring Methods and Systems. Springer, Cham. https://doi.org/10.1007/978-3-319-77733-7_11
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