.... In this work, a waxy crude sample was collected from an onshore field in the Niger Delta region. Subsequently, the sample was contaminated with various levels of oil base mud in order to investigate the errors induced by OBM on waxy crude properties such as the wax appearance temperature (WAT), pour point...

...-out time compared to a conventional probe for all variations of formation permeability anisotropy ( k h /k v ), Sample to Guard flow rate ratio, and mud invasion rate. Contamination Prediction Method Development The method presented is developed in WFT sampling with a Hrametz focused probe...

... formation properties. Oil-base muds (OBM) are partially to completely miscible with the reservoir hydrocarbons, and so OBM contamination causes alteration of fluid properties which becomes even more critical for condensates when changes in fluid viscosity, density, and relative permeability occur. Due...

...SPWLA 49th Annual Logging Symposium, May 25-28, 2008 1 MULTICHANNEL OIL-BASE MUD CONTAMINATION MONITORING USING DOWNHOLE OPTICAL SPECTROMETER Kai Hsu, Peter Hegeman, Chengli Dong, Ricardo R. Vasques, Michael O'Keefe, and Mario Ardila, Schlumberger Copyright 2008, held jointly by the Society...

... The four contamination measuring methods used in the case studies are as follows: OBM Contamination Monitoring (OCM) method Introduction Throughout the history of formation evaluation, the mud used to drill a well often limited the quality of wireline data and samples retrievable from...

... Abstract It has been proposed (e.g. Ref. 1 ) that formation water compositions can be calculated from drilling mud contaminated sample analyses using a simple mixing model if a tracer is added to the drilling mud. In this paper we test this proposition using field data obtained from 18 wells...

... of the oil based mud contaminated cuttings generated in the drilling process. These are conventionally discharged overboard and fall in discrete piles around the platform. A significant and prolonged impact on the benthic ecology is apparent resulting from this contamination. British Petroleum is therefore...