@inproceedings{86f73cf3f97e4cac90a0e01d8f4325ed,
title = "Imbibition processes in fractured chalk core plugs with connate water mobilization",
abstract = "A displacement process in a chalk core plug with an induced axial fracture uses the fluid system H 2O-D 2O-n-decane. Initially the plug contains a mixture of D 2O and n-decane with oil saturation equal to 88 %. The plug is flooded with H 2O. The displacement process is monitored by NMR with a chemical shift technique enabling spatial resolution of the H 2O and oil signals. The D 2O component is not directly detected, but is calculated from the difference between the actual signal intensities and the signal intensities in a situation where the pore space is completely saturated with H 2O and oil. H 2O-D 2O-oil constitutes a partly miscible fluid system which is an analogy to the injection water-formation water-oil system of a hydrocarbon reservoir under waterflooding. The injected H 2O traverses the sample as a well-defined front together with capillary uptake from the fracture plane. Ahead of the H 2O front the D 2O of the sample is mobilized and travels as a bank in front of the H 2O. Though the initial concentration of D 2O is only 12 % the D 2O concentration reaches 50 % at the bank. The experiment was simulated by means of ECLIPSE with a fair match of the displacement process. The injected H 2O has only made limited contact with the produced oil of the sample. In case of chemical EOR processes connected to waterflooding of hydrocarbon reservoirs a similar displacement situation could seriously affect the efficiency of the EOR process. ",
author = "C.M. Nielsen and D. Olsen and N. Bech",
year = "2000",
doi = "10.2118/63226-MS",
language = "English",
series = "SPE Reservoir Engineering (Society of Petroleum Engineers)",
pages = "709--718",
booktitle = "SPE Annual Technical Conference and Exhibition, 1-4 October, Dallas, Texas",
publisher = "Society of Petroleum Engineers",
edition = "B",
note = "SPE Annual Technical Conference and Exhibition 2000 ; Conference date: 01-10-2000 Through 04-10-2000",
}