Lesson: Harvesting Oil from the EarthContributed by: Integrated Teaching and Learning Program, College of Engineering, University of Colorado Boulder
Educational Standards :
Learning Objectives (Return to Contents)
After this lesson, students should be able to:
Introduction/Motivation (Return to Contents)
What is as precious as gold? Oil! Have you ever wondered where oil comes from, or what its use is? Well, the U.S. gets about 40% of its energy from oil, a fossil fuel that is also referred to as petroleum, which comes from sedimentary rocks under the Earth's surface. It takes millions of years to create oil. The process started way before the times of dinosaurs, but it is estimated that humans will use all the oil that exists in 40 to 60 years. Americans have been drilling for oil since about 1859, when the first oil well was constructed (see Figure 1).
How do oil companies extract (pull out) these tiny droplets away from the rock located thousands of feet underground? How does this oil move through the dense rock and into wells that take it to the surface? How do the tiny droplets combine into the billions of gallons of oil that the U.S. and the rest of the world use each day? Where should engineers drill oil wells to ensure that the most oil is contacted? How should machinery be built and used to get oil? So many questions exist about oil. Fortunately, scientists and engineers use their science and math skills to find answers and solutions to these questions.
First, to harvest oil, we must find it. But, how do you know where is it if you cannot see under the ground? Geological and petroleum engineers drill holes in the Earth to get core samples of the underground layers. If oil is found in the core sample, then the chances are good that more oil is present in the region surrounding the core. Next, the oil must be extracted and transported to a location where it can be used. Unfortunately, most of the steps involved in getting oil to our homes and vehicles usually cause pollution. Pulling oil up to the surface of the Earth can pollute the ground, moving oil to other locations can sometimes cause oil spills, and burning oil to get energy for automobiles or at energy plants produces air pollution.
Despite the potential for pollution, oil provides energy for most of the U.S. Most cars run on gasoline, which is made from oil, and many houses are heated by oil. Engineers need to know about oil reservoirs before they begin the process of drilling wells, which is very costly. Incorrect predictions can be costly errors for oil companies. They need to know about the size and number of pores in reservoir rock. They need to know how fast oil droplets move through these pores. They need to know where the natural fractures are in reservoirs so that they know where to drill wells. Finding the answers involves research that is a mix of fluid mechanics, thermodynamics, applied mathematics and geology, which are all engineering areas of study. Engineers develop the machines and tools used for all steps for the extraction, transportation and burning of oil for energy.
Lesson Background & Concepts for Teachers (Return to Contents)
Fossil fuels are energy-rich substances that have formed from the Earth's long-buried plants and microorganisms. Crude oil, one common fossil fuel, is formed in sedimentary rocks. Sedimentary rocks are rock layers formed from sediments, such as sand and organic matter that are transported, deposited and cemented together over time. Sedimentary rocks typically have visible layers of different kinds of sediment (see Figure 2).
The sediment is always deposited in horizontal layers, one on top of the other. Therefore, sedimentary rocks exhibit horizontal layers initially, and the layers closest to the bottom, or found deeper under the Earth's surface, are the oldest. Over time, however, the Earth's natural and dynamic processes, such as erosion and plate tectonics, can alter the rocks. Plate tectonics causes rocks to fold and fault, as seen in Figure 3 (refer to the Earthquake Formation lesson of this unit for more information).
How Fossil Fuels are Formed
Millions of years ago, in certain parts of the world, when thriving marine communities with lots of different organisms died, they became organic matter (sediments) on the ocean floor. Over time, more sediment was deposited on top, and both layers solidified into sedimentary rock. A sediment layer with a lot of organic matter has the potential to become oil, provided a couple of other things happen. Usually, microorganisms consume the organic matter in rock layers; however, if the rocks are located in a low-oxygen environment, different microorganisms — called anaerobic organisms — turn the organic matter into methane. Methane, also called natural gas, is made of hydrogen and carbon that can itself be used for energy or it can be turned into oil. Methane becomes oil if it is created deep below the Earth's surface and trapped there by an impermeable rock that it cannot pass through. Impermeable rocks, such as granite that trap methane and oil under the ground are called cap rocks. At locations where cap rocks are faulted, or folded, large oil deposits can be found (see Figure 4).
Oil can also found in reservoir rocks, which are permeable rocks in which methane gas became trapped as it migrated up and turned into oil (see Figure 5).
Processing and Finding Oil
First, to harvest oil, we must find it even though it is deep underground where we cannot see. Geological and petroleum engineers drill holes in the Earth to get core samples of the underground layers. If oil is found in the core, then the chances are good that a lot more oil exists in the area surrounding the core. Engineers set up equipment to drill in the exact area that their tests show contain a lot of oil. Then, the oil is extracted, usually by the use of oil wells that pump the oil up to the surface. Extracting oil and using oil can be potentially harmful to the environment. Sometimes when the oil is brought to the surface it contains sediments that cannot be used for energy. If these sediments are not disposed of carefully, they can cause pollution. Once extracted, the oil is transported to where it will be refined and used. During transport, oil has the potentially to cause more pollution. For example, sometimes tankers full of oil run aground and cause oil spills or steadily leak into the ocean. Finally, refining and burning oil contributes to air pollution — and that is in addition to vehicles burning refined oil products, such as gasoline, for energy. Despite the potential for pollution, oil provides essential energy for most of the U.S. Most of our nation's cars run on gasoline, which is made from oil, and many houses are heated by oil, not to mention the enormous amont of plastic products made from crude oil. Because of the anticipated decline in oil supplies and contributions to pollution, engineers are continually searching for more efficient ways to power automobiles and heat houses that use less oil.
Vocabulary/Definitions (Return to Contents)
Associated Activities (Return to Contents)
Lesson Closure (Return to Contents)
What is oil used for? (Possible answers: Oil is refined into many products for many purposes. Some oil is burned to create energy to run automobiles, heat houses, or for oil-burning lamps. Some oil is refined into lubricants used for maintenance of moveable parts such as motors, door hinges and swings. Some oil is used in to create the uncountable number and types of plastic materials that we use everyday.)
Where does oil come from? (Answer: Oil is a fossil fuel found underground that was created from plants and animals that were alive millions of years ago.)
How does oil contribute to pollution? (Possible answers: The side affect of air, land and water pollution from burning it in vehicles, industry and factories, and during the extraction of and transportation of oil from the Earth.)
Can you think of any ways to help reduce the pollution caused by the drilling and transport of oil?
Do you have any ideas of ways to conserve oil so we do not run out of it in 40 to 60 years?
Assessment (Return to Contents)
Brainstorming: Have students generate a number of possible ideas about the following question. Remind students that no idea or suggestion is "silly." All ideas should be respectfully heard. Ask the students:
Question/Answer: Ask questions and have students raise their hands to answer. Discuss their answers as a class.
Lesson Summary Assessment
Numbered Heads: Divide the class into teams of three to five students each. Have students on each team number off so each has a different number. Ask the students a question (give them a time frame for solving it, if desired). Have the members of each team work together to formulate an answer. Everyone on the team must know the answer. Call a number at random. Students with that number raise their hands to answer the question. If not all students with that number raise their hands, give the teams a bit more time. Pick a student to answer. Continue until you get the correct answer.
Lesson Extension Activities (Return to Contents)
Make a core sample using cupcakes: http://www.coaleducation.org/lessons/wim/4.htm
See the following website for a fun activity on what rocks contain: http://www.schoolscience.co.uk/content/4/chemistry/findoils/index.html
References (Return to Contents)
Keller, Edward A. Environmental Geology, 7th Edition: New York, NY: Prentice Hall, 1996.
ContributorsJessica Todd, Melissa Straten, Malinda Schaefer Zarske, Janet Yowell
Copyright© 2004 by Regents of the University of Colorado
Supporting Program (Return to Contents)Integrated Teaching and Learning Program, College of Engineering, University of Colorado Boulder
Acknowledgements (Return to Contents)
The contents of this digital library curriculum were developed under grants from the Fund for the Improvement of Postsecondary Education (FIPSE), U.S. Department of Education and the National Science Foundation (GK-12 grant no. 0338326). However, these contents do not necessarily represent the policies of the Department of Education or National Science Foundation, and you should not assume endorsement by the federal government.