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Hydraulic Fracturing

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High Volume Hydraulic Fracturing: Tight Oil

Kevin Conibear 10060801

Geology 377: Petroleum Engineering Dr. Rob Taerum April 11, 2014

Introduction Tight oil has reversed a decline in Western Canadian and U.S oil production. In tandem with advancements in horizontal drilling, high volume hydraulic fracturing has enabled companies to tap into billions of barrels of tight oil that were previously thought to be inaccessible. Tight oil, trapped in microscopic pores within impermeable layers of shale, is an unconventional oil reservoir. Unconventional reservoirs cannot be extracted through a traditional ‘well and pump’ procedure. Conversely, conventional oil reservoirs can be extracted through this traditional process. Conventional reservoirs are layers of rock that allow oil to flow relatively easily through a series of pores in the rock, thus are high in porosity and permeability. However, there are a diminishing number of conventional reservoirs, leading to the increased demand for the production unconventional oil – tight oil. Hydraulic fracturing is a technique that creates cracks within shale formations, allowing tight oil to flow freely for efficient and profitable extraction. This process has only recently been utilized to its great potential, and has proven to have profound economic implications. What is shale? Shale is fine-grained sedimentary rock that is often rich in in petroleum and natural gas. Sedimentary rocks are formed through an accumulation of sediment both on earth’s surface and within bodies of water. When shale is formed, the grains of the rock are compacted very tight and thus produce very low porosity and permeability. Porosity allows for the storage of copious amounts of organic material to cook and become oil, while the permeability allows for the oil to flow into large underground basins. Oil trapped in shale’s microscopic pores cannot

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