O&G ACC Midterm Flashcards
(146 cards)
What is a Renewable Energy?
Renewable: energy source that is replenished by nature at about the same rate as consumption
What is the difference between a fossil fuel and renewable?
Fossil fuels take more years to replenish - consumption outpaces replacements
What is the future demand for Oil & Gas vs Renewables?
Projected oil and gas will remain strong
Why: Total energy demand will outpace renewables growth
Oil and Gas Uses
It is used in almost every part of modern life.
Examples: Bedding, Heating, Carpet, Personal Care, Pharmaceuticals, Clothing, Decor
Shortcomings of Renewable Energy
Renewable energy is not able to substitute all existing uses of oil and gas
- Example: oil is used to produce plastics, no RE alternative
4 Hydrocarbon Gases
Methane - 1 carbon
Ethane - 2 carbon
Propane - 3 carbon
Butane - 4 carbon
- Mice Eat Peanut Butter
- More carbons the lower you go
Characteristics of Hydrocarbon Gases
(heavier, energy content, market value)
Butane is the heaviest and has the highest energy content. Therefore, higher market value
The more carbons the heavier Mice Eat Peanut Butter
What does a higher energy content mean?
One mcf of Butane will generate more heat when burned
What does a Produced Gas Stream Contain?
- Methane (wet 70%, dry 90%)
- Heavier gases
- Suspended hydrocarbon liquids (NGLs)
- Contaminants
What is Condensate?
Portion of any suspended liquids that condenses out of the gas steam at the production site
Why: As gas cools and expands as it passes through processing equipment
Condense –> Condensate (gas to liquid)
What are Natural Gas Liquids?
Suspended liquids molecules and liquefied gas molecules removed from the gas stream
Not Liquified Natural Gas
What Must Happen before gas enters Long Haul Pipeline?
Wet/rich and/or contaminated gas must be processed before entering this pipe line
What is Pipeline Gas?
Pipeline Gas is almost pure methane w/ small amounts of heavier hydrocarbons and some contaminants
What is Liquefied Natural Gas?
Almost pure methane cooled down to liquification temp to shrink volume (1/600th) so it can be economically shipped by ocean carriers
Advantages and Disadvantages of Liquified Natural Gas
Advantages:
- Overcomes pipeline limitations
Disadvantages:
- Expensive Process
- High shipping costs
US Position with Liquified Natural Gas
- Several new export facilities
- goal to make profit selling cheap us gas in LNG markets
- Biggest Markets: Asia and Europe
What is Crude Oil Composition?
Divers mix of liquid and solid molecules, liquid characteristics in general
Average comp: light and thin (less carbons) to heavy and vicious (more carbons)
- some entrapped gas molecules
How is Crude Oil Gravity measured?
API Gravity scale - Thermohydrometer
Adjust gravity reading to standard 60f temp
Counter intuitive: Heavier crudes have a LOWER value
How does weight of oil Affect Price?
Lighter crude oil sells for a higher price
- Contain more light liquid molecules that make high-value products
Examples: Gasoline, jet fuel, diesel
Effects of Sulfur in Crude Oil
High sulfur content lowers the value of crude oil
- sulfur levels tightly restricted in the refined product, extra removal = refining costs
Sweet vs. Sour Crude
Sweet = Low Sulfur
– More than .5%
Sour = High Sulfur
– Less than .5%
How does the separation of Hydrocarbon Molecules happen? (Gas Plants - NG)
Chilling - Gas plants primarily use chilling to separate heavier gas components out of methane
Fractionation - Boiling off different hydrocarbons one by one
How does the separation of Hydrocarbon Molecules happen? (Refineries- Crude Oil)
Heat Driven - Refineries use a heat-driven distillation to sort through a range of molecules
heat and catalyst to boil out lighter molecules and break heavier molecules
Refineries: What is the Cracking Process?
Breaking heavier molecules into lighter, higher-value molecules