This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
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 threephase 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 BuckleyLeverett 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!! onessesame 1m
Gumadoreﬂi {a} The endpoint mobilityr ratio for homework #8 is 50. Make a sketch of a fractional
ﬂow curve corresponding to an endpoint 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 ...
View
Full Document
 Spring '10
 Johns

Click to edit the document details