Download Exam 1 | PETE 2031 - RESERVOIR ROCK PROP and more Quizzes Engineering in PDF only on Docsity!
Primary Recovery
Production usingreservoirpotential/ pressure.perforations made at bottom of drill pipe and pressure pushes oil out12- 15% TERM 2
Secondary Recovery
DEFINITION 2 injection of water or gas for pressure maintenanceto keep pressure other pipes drilled inject fluidtowardsproduction well15-20% TERM 3
Tertiary Recovery (Enhanced Oil
Recovery)
DEFINITION 3 Injection of fluids to displace remaining oilinjections squeeze oil out ( inject products cheaper than oil)4-11% TERM 4
Initial Oil Vol. (Vi) Final Oil Vol at end of
primary recovery (Vf)
DEFINITION 4 Vi = VfMi > MfOil expands as pressure drops TERM 5
Fence Diagram
DEFINITION 5 3Drepresentationof the geological systemsstill a great deal ofuncertaintyin geo modeling
Total Bulk Volume (Vt or Vb)
=grain or solid volume (Vg or Vs) + pore volume (Vp)Vt = Vg
Residual Porosity (r) =
DEFINITION 7 =t -etotal - effectiveHigherr = higher level of connectivityif all pores connectedr = 0 TERM 8
Unit Cell
DEFINITION 8 can be used to represent an entire system TERM 9
OOIP
DEFINITION 9 AH(So)Sg + So + Sw = 1 TERM 10
Phase Behavior P < Pbub - P > Pbub
DEFINITION 10 Saturated --- Unsaturated (gas is compressed to mix with liquid)
Relative
Permeability
Deals with multi phase flow(oil, water, gas) TERM 17
Fluid Potential
DEFINITION 17 = P - gz TERM 18
Reservoir rocks
DEFINITION 18 Sandstone (60% of worlds reserves)Carbonates (1/3 of world reserves)Shales (fractures shales)Evaporates ( rock salt, anhydrite, gypsum) Most reservoir rocks are sedimentary. reservoirs in igneous and metamorphic are rare bc of high temp TERM 19
Shale
DEFINITION 19 also called "mudstone"a fine grained sedimentary rock whose original constituents were clay minerals or muds TERM 20
Primary Porosity (inter-granular)
DEFINITION 20 Porosity due to sediment deposition. Pore spaces are between individual grains of sedimentsandstone porosity isreferredto as Primary
Secondary Porosity
Voids formed after sediments were deposited and hence not related to original sedimentary particles (carbonate reservoir)harder to estimate so adds more to uncertainties in reservoir engineering calculations TERM 22
Secondary Porosity: Solution or Vugular
DEFINITION 22 due to solution of more solution parts by reservoir fluids Fractures, Fissures, Joints- formed by structural activitiesDolomitization- when limestone (CaCO3) transforms to dolomite (CaMg(CO3)2) TERM 23
Dual Porosity
DEFINITION 23 When primary and Secondary Porosity exist in the same formation TERM 24
Hydrostatic pressure
DEFINITION 24 the pressure exerted by a fluid atequilibrium due to the force of gravity. TERM 25
Hydrostatic pressure gradient
DEFINITION 25 the slope of hydrostatic pressurein P vs. z domainPress (p) vs Depth (z)he The normal hydrostatic pressure gradient for freshwater is about normal hydrostatic pressure gradient for freshwater is about0.433 psi/ft, or 9.792 kPa/m,
