Petroleum Geology
Petroleum Exploration
Data Types
Miscellaneous
Drilling Engineering
100
Name 2 of the 3 things necessary in order to have a petroleum reservoir.
Source rock, Reservoir rock, Trapping Mechanism
100
Name the 2 most common types of reservoir rocks (general grouping)
Sandstones and carbonates
100
What are the two methods of reservoir sampling discussed in the slides?
Core and cuttings
100
Who was the pioneer(s) of well logging in the oilfield industry? (Not on slides, discussed in class)
Slumberger (Marcel and Conrad)
100
What advantage does a PDC drill bit have over a rotary bit?
Diamond vs steel/tungsten carbide. Last longer.
200
Name 2 categories of petroleum traps (broad categories)
Structural, Stratigraphic
200
Give an example of a feature in a reservoir that causes oil migration
Synclinal spill point, Fault leak spill point, gas cap
200
A seismic "shot" is picked up on a receiver through energy _______ and energy __________
transmissions and reflections
200
What is the uncontrolled influx of a fluid into a wellbore called?
A kick (kicks are sometimes precursors to a blowout)
200
When talking about tubing, what is the difference between nominal weight/weight per foot and actual weight/weight per foot?
Nominal is tube only, actual includes connections
300
What is the API Gravity of pure, fresh water at 60 degrees?
10, given an assumed specific gravity of 1
300
What are two categories discussed in class of reservoir seals (three discussed)
Top seals, fault seals and lateral seals
300
What is a major problem with using cuttings as a method of well sampling?
There is no control on the depth from which the sample came from, can come from any zone not cased.
300
Give your best definition of seismic well logging
Determination of seismic properties of rocks in boreholes by determining the velocities and the coefficients of reflection, transmittance, and absorption of elastic waves.
300
Give two purposes discussed of casings, liners and tiebacks (there were four given).
Protects fresh water aquifers, anchors well control equipment, protects wells from transition zones (low and high pressured zones), protects holes from poor formations such as salts and sloughing shales
400
Give an example of sedimentary facies.
Def-physical, chemical, and biological aspects of a sedimentary bed and the lateral change within sequences of beds of the same geologic age. So anything which falls within this definition. Could be coarse sandstone (facies by grain size), cross stratified sandstone (facies by structure), etc. See full list in Dr. Fleckenstein's notes.
400
When calculating the properties of a fault bound anticline reservoir, why do we make a geometrical assumption of half a cone? (May draw or explain)
Explaining is too difficult for me, I'll just draw it.
400
Give 1 example of a mobile land rotary drive drilling rig
Jackknife, portable mast, coil tubing
400
What is the main purpose of an annular preventer on a drill rig?
To prevent blowouts
400
List from smallest to largest: intermediate casing, production casing, conductor, surface casing
Production-intermediate-surface-conductor
500
Name 2 of the 4 types of structural/stratigraphic traps listed in Dr. Fleckenstein's powerpoint
Updip sedimentary/diagnetic trap, unconformity/buried hill traps, Incised valley, stratigraphic onlap
500
Critical thinking: Calculate the volume of a core sample that is 8% saturated with hydrocarbons, weighs 400 grams and has a bulk density of 1.3 g/cc.
400/1.08=370.37 grams 370.37 grams/1.3 g/cc=284.9 cc
500
Give 5 examples of properties that well logs measure (there were 9 listed in your slides)
Lithology/Mineralogy Porosity Permeability Fluid Type Fluid Saturation Stratigraphy Downhole pressure Density Acoustic Velocity
500
What is an example of oil biodegradation? (Hint: this is how some heavy oils are formed and is how the BP oil spill was cleaned up)
Insects/Microbes eating the oil
500
Draw a fishhook well profile
Down and then angled, but not horizontal
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