reservoir fluids

Aug 14th, 2016
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Physical and Chemical Properties of Reservoir FluidsI.OVERVIEW OF RESERVOIR FLUID CONTENTa. Introductioni. Dominant Subsurface Fluids within 15,000 20,000 ft of Earth Surface1. Water most abundant, predominant2. Oil and gas relatively low volumes comparativelya. Oil and Gas occur in water-rich environmentb. Water an important component of oil and gas explorationii. Water-Oil-Gas mixtures and chemical properties vary according to regional geologyiii. Oil and Gas1. Relatively insoluble in water; gas and oil are miscible with one anothera. Gas dissolution / exsolving from solution2. Lower density than water3. Buoyant fluids4. NAPLs Non-Aqueous Phase Liquidsb. Source of Datai. Drill holes and wells1. Drilling recovery, well cuttings, drilling mud, core2. Drill stem tests / fluid recovery3. Directly drill-hole samplingii. Direct fluid sampling via wellsiii. Borehole Geophysical measurements1. E.g. conductivity, resistivityiv. Reservoir fluid analysis over production life of well1. Changing dynamics as production wells are utilizedc. Fluid Distributioni. Controlling Factors1. Reservoir Porosity and Permeability2. Stratigraphic and Structural Relationships3. Density and Buoyancy Effects of Water, Oil, Gas4. Anomalous Lensing Possible (e.g. gas trapped below oil)ii. Layered Fluid Occurrence1. Gas less dense (on top) ----- Oil ------ Water Most Dense (on bottom)2. Oil-Water Table Contact vs. Gas-Water Table Contactiii. Interstitial W

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