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4051
exam 1
20
Engineering
Undergraduate 4
09/13/2011

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Term
reservoir engineering encompasses what branches
Definition
environmental, geothermal, and petroleum
Term
the reduction of well spacing, remain in the same section of the reservoir (not drilling a different part of the reservoir)
Definition
infill drilling (reservoir exploitation)
Term
5 requirements of a reservoir. (if you don't have 1 of these, you don't have a reservoir)
Definition
1. source (typically organic rich shales)
2. Trap or Seal
3. Migration Pathway
4. Storage Capacity (must be porous)
5. Transmissivity (must be permeable, able to flow)
Term
why does oil volume shrink as it is brought from the reservoir to surface?
Definition
gas evolves as the pressure is lowered
Term
why does gas volume expand?
Definition
the pressure drops
Term
why does gas volume contract
Definition
the temperature drops
Term
when would you want to use a dissolved (or solution) gas drive?
Definition
when you have an oil that is "undersaturated" gas. Initially no free gas is present (volatile and black oils)
Term
they are on the stock market.
does not include private companies
Definition
publicly traded companies (they HAVE to report to the SEC)
Term
what do companies have to report to the SEC
Definition
Proved net reserves
economic forecast using existing costs and product prices
Term
"much more likely to be achieved than not"
Definition
"reasonable certainty" (proved reserves)
Term
"reasonable certainty," economic under existing conditions, supported by actual tests and production
Definition
Proved Reserves
Term
a significant investment is required. Reasonably certain that the locations will be developed.
Definition
undeveloped proved reserves
Term
There are fish in the lake. You may have caught some yesterday. You may have even be able to see them. But you have not caught any today.
Definition
Probable
Term
There is water in the lake. Someone may have told you there are fish in the lake. You have the boat on the trailer. But you might go pay golf instead.
Definition
Possible
Term
-Usually early in the reservoir life.
-Good estimates require a lot of work.
-Evaluated as "similar to" another reservoir.
-Monte Carlo statistical simulation
Definition
Analogy method
Term
-Requires reasonably accurate pressure, PVT, and production data.
-pressure needs to be an appropriate "average" for entire reservoir
Definition
Material Balance
Term
can be done throughout the life of the reservoir to find additional areas that may not be draining to the production wells.
-requires considerably more computational effort
Definition
Reservoir Simulation
Term
requires the least amount of information to tell you something about the reservoir
Definition
"type curves" (Decline Curve Analysis)
Term
Just says that the production rate will/won't continue @ the #s used to create the curve
Definition
curve fitting program
Term
uses the most ubiquitous data that you have available to you
Definition
Decline Curve Analysis
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