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# test3.key - «has PGE 323 Teststﬁ Open noteu May 5 2034...

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Unformatted text preview: «has? PGE 323 Teststﬁ Open noteu May 5. 2034 Pope 1. {33%) The aqueous phase in oil reservoirs and aquifers always consists of many components besides water and these components are often very important e.g. electrolytes affect the permeability. {a} Assume three-phase flow tn a three- dimensional oil reservoir. Derive from ﬁrst _pﬁncipleaamasshaianee. onenmponenﬁnﬁthaaqneous. phaseassnroiugm. mass transfer to the oil and gas phases. {b} Write the appropriate form of Darcy's law and Fields law for this problem to} Derive the difﬁtsivity equation for component i in the aqueous phase 2. [59%) Assume gas is displacing oil in a reservoir at residue] water saturation and all of the assumptions umd to derive Buckley-Leverett dreary apply. The fractional flow diagram you calculated in homework #3 is shown below with the shock front tangent drawn on it. _ 5W . = ﬂﬁ- 5 E hummnwﬂenm e E. amass ate alsaaeaziosness side we ﬁsh set M5 m are at!!- ones-sesame 1m Gum-adoreﬂi {a} The endpoint mobilityr ratio for homework #8 is 50. Make a sketch of a fractional ﬂow curve corresponding to an end-point mobility ratio of 5. You do not need to make any calcuIatjons to make this sketch. Just draw in a curve that shifts in the appropriate direction and has the appropriate and points. {h} Compare the displacement sweep efficiency at Ll] pore volumes of injected gas for each of the two fractional flow curves and an initial gas saturation of—Eﬂﬂ. Show the appropriate tangents and other details of your work. Explain why the sweep efﬁciency increases when the end—point mobility ratio decreases. 71:4. W ‘ £23] W M {45 ...
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