In the last decade the extraction of natural gas from underground reservoirs has increased. Natural gas supplies 24% of the United States energy demand and is only expected to grow. Shale gas is natural gas that is found trapped in shale. Shale is sedimentary rocks that consist of clay minerals that have low permeability. Natural gas that is found in shale is buried in fractures below ground and must be extracted by hydraulic fracturing, also known as fracking [10]. One of the most recognized sites for the extraction of natural gas by fracking has been at the Barnett shale in the last decade. The Barnett shale is a region that extends west of Fort Worth, Texas to the Permian Basin and has been known to extend as far south into Mexico. The Barnett shale is a complex system of fractures in which the region has seen new developments in fracking to extract the natural gas from the ground [11].
In order to extract shale gas a well is dug into the fracture and fracturing fluid is placed in the well. Fracturing fluid consist mostly of water with chemicals that act as a friction reducer, sc...
Gas in shale formations are“low in permeability,” making it very tedious to extract, but with the increase in technological knowledge in fracking and horizontally drilling into shale beds, the vast reserves of natural gas resource could be extracted (4). Fracking is a large industrial operation that boost the “productivity of a oil or gas well” (5). It is a process by which, under very high pressure, a mixture of water, chemicals, and sand, are pumped into shale formations that causes fractures in the rocks to open wider or create new fractures that would allow otherwise trapped oil and gas to flow into the wells (6).
The amount of water required and the different chemical additives used in the frac fluid is what poses a threat to the safety, health and welfare of the public. Hydraulic fracturing uses concoction of slush water, sand and chemicals combined with pressure to stimulate to either create or expand cracks in the shale. One of the main concerns is the large amount of fresh water used and lost in todays fracturing techniques. Certain fracturing techniques can use to 8 millions gallons of water, either freshwater or treated produced water. This freshwater makes up about 98% to 99% of the total volume of the slush (fracfocus.org). After the frac is done the w...
One of the biggest natural resources used in fracking is water. On average, around one to eight million gallons of water are used on a fracture job. There are also around 500,000 active fracture sites around the world and each site can be fractured around 18 times. This means that roughly 72 trill...
Fracking is the process of extracting natural gas from layers of shale rock deep within the earth. One of the world’s largest plays of natural gas is in the Marcellus Shale, is located in the Appalachian basin and extends across New York, Pennsylvania, Maryland, West Virginia, eastern Ohio and portions of Kentucky and Tennessee. “Plays” are areas where companies are actively looking for natural gas inside shale rock formations. Plays are drilled for natural gas by hydraulic fracturing in a two step process. First, a production well is drilled down into the ground for thousands of feet and then gradually leveled so that the tip of the drill is travelling horizontally through the ground. The second part of the process is where it gets the name of “fracking” because the second step in the process is where a mixture of sand, water, and chemicals, many of which are known to be harmful, are forced under extremely high pressure down into the shale through the horizontal part of ...
...ydraulic fracturing. During Hydraulic fracturing, or fracking, holes are drilled into shale rock formations, deep beneath the earth's surface and injected with more than a million gallons of pressurized fracking fluid. This process creates small fissures within the rock layers that are held open by the sand particles, allowing the natural gas to vacate from the well (10). However, there is much debate over the long-term vitality and validity of the use of unconventional gas as a solution to the United States dependency on foreign oil. Much of this debate stems from what some have coined as the "exploration treadmill", the rate at which new plays must be added to production, in order to maintain a flat line and or growing (carbon)
In the article “The End of Easy Everything” by Michael T. Klare he details the controversial process of how these unconventional sources of oil and gas are extracted. “To obtain gas in this manner, a powerful drill is used to reach a gas-bearing shale formation, often thousands of feet underground, and then turned sidewise to penetrate the shale layer in several directions. Then concrete is applied to the outer walls of the resulting channels, explosives are set off to penetrate the rock; then millions of gallons of water-usually laced with lubricants and toxic chemicals-are poured into the openings to fracture the stone and release the gas. The “frack” water is then pumped back up and stored on site or sent for disposal elsewhere, after which the gas is sucked out of the ground.” Although this process has only recently existed making fracking much more alluring in an article by Matt Egan “Oil Milestone: Fracking fuels half of U.S. Output” he details how the fracking revolution has taken place. “Innovation has made previously-expensive fracking much more efficient. High oil prices before and after the Great Recession lured tons of investment dollars fueling a technological revolution.” In addition the United States sits on massive shale reservoirs such as the Green River formation and the Marcellus
Environmental and socioeconomic debate over an alternative method of extracting natural gas thousands of feet below the surface using horizontal drilling and hydraulic “fracking” has risen in last twenty years. Fracking is the technique of drilling deep wells under high pressure with sand, water and a variety of chemicals to crack open rocks to release natural gas (hydrogen carbons) and oil from shale or coal bed methane deposits. Townships in Colorado like Lafayette and Fort Collins, voted on a moratorium to ban fracking within city limits. Environmental organizations like the Clean Water Action and Sierra Club claim that that fracking causes environmental degradation, health issues and impacts negatively on communities and their infrastructure. Whereas organizations like the Colorado Oil and Gas Association (COGA), Halliburton and other oil and gas industry and construction groups, and some local, state and federal politicians, claim that fracking is a safe method of onshore drilling. By burning natural gas which is considered a clean fuel reduces the amount of greenhouse gases that coal does as well as lower carbon energy use in the future. Fracking decrease dependence on foreign oil and gas, improves ability to generate electricity and heat home cheaply. Fracking supports local economies and provides much needed jobs (energyfromshale.org).
Shale gas is a kind of unconventional nature gas, which is trapped or gathered in the dark shale or carbon rock. The rock layer has low permeability and low porosity, which means that the best way to get this recourse is fracturing to enhance connectivity and porosity. The shale gas reservoirs are mainly located in North America, Central Asia, China, Latin America, Middle East, North Africa and Russia and other countries and regions. The United State and Canada are only two countries, which have significant shale gas production.
Before one can see the devastating effects of fracking, one must first understand how fracking works. As previously stated, the main intent of hydro-fracking is to access and harvest natural gas that lies below the surface of the Earth. Having formed over 400 million years ago by the collision of tectonic plates (Marsa 3), the Marcellus Shale plays host to a gold mine of natural gas, which is currently at the center of the fracking debate in the Northeastern region of the United States. Unfortunately, access...
Natural gas extraction and consumption has risen over the past thirty years. Also known as hydraulic fracturing or fracking, a tremendous amount of uproar is being made in the environmental and political communities. Natural gas use is a great source of energy worldwide, only in America have we had a gold rush affect when it comes to extraction. Natural gas provides less dependence on foreign oil, less need for coal plants, and a more affordable energy source worldwide. There are many advantages to using natural gas but the way in which it is being extracted has caused many people to become sick. The detrimental environmental impacts caused by hydraulic fracturing continue to rise. Not to mention the political pull on big corporations and water quality standards. Currently in the Marcellus shale in Pennsylvania and the Barnett shale in Texas, the air and water quality have diminished over the past years since drilling sites ran rampant. Natural gas is natural in terms of how it came to be, but not natural in how they extract it and the problems it is causing everyone involved. To make aware the dangers of hydraulic fracturing, environmental impacts, water quality and air emissions, must be considered.
America is facing an energy revolution. The shift from traditional energy sources such as coal and oil are fading while newer sources are being used to sustain an insatiable thirst for energy. A front-runner is natural gas, a cleanly burning and abundant alternative for conventional energy sources. This nonrenewable resource is found miles underground in prehistoric shale deposits, to show the magnitude “North America has approximately 4.2 quadrillion (4,244 trillion) cubic feet of recoverable natural gas that would supply 175 years worth of natural gas at current consumption rates” locked in these shale deposits (Loris). However, the dilemma comes from how natural gas is extracted from the earth. One of the processes of accessing the natural gas is called Hydraulic Fracturing or “Fracking”. It is the process of shooting a highly pressurized mixture of water, sand, and chemicals into cracks in the shale deposits, essentially fracturing the shale that then releases the natural gas (Malakoff).
Fracking is a procedure that uses high-pressure fluids to obtain shale gas through the drilling of underground rocks. According to Broderick et all (2011), shale gas1 is found trapped within the shale2 formations, it is a very flexible substance as it has a wide range of uses, such as automobile fuels, domestic use and power generation. Nowadays, the gas demand is increasing vastly. Shale gas is one of the main sources of energy for some countries, such as United States of America and United Kingdom (Broderick et al. 2011). The low permeability3 of the shale makes difficult the flow of the gas inside it, therefore, it makes inviable to extract the substance without the support of hydraulic fracturing. Higher the permeability of a rock, higher the flowing of the fluid on it (King 2012). In order to improve the shale gas extraction, a high pressure mixture of water, sand and other additives is injected in the rock to increase its fractures and facilitates the flowing of the gas and its capture (Howarth et al. 2011). The figure below illustrates the fracking process.
Hydraulic fracturing, having been patented in 1949 has been the caveat by which one third of the natural gas in the U.S. is obtained.1 The fracturing process requires millions of gallons of fluid to be driven into the ground at high enough pressures to break up shale and rock and in turn lets out natural gases. The process has been proven to be very successful thus being one of the major contributors to modern day natural gas collecting. Though there are many great aspects to hydraulic fracturing, concerns do arise. What is in this fracturing fluid? Is there ground water being contaminated with rocks and the unknown fluid during this process? The hydraulic fluid is known to contain a variety of additives such as dilute acids,
Hydraulic fracking is an extraction technique used to uptake natural gas in a deep gas well drilling (Brown et al., 2007). Rocks are fractured by a pressurized liquid which is typically a mix of water, s...
The number of wells fracked grew significantly, reached 3000 wells per month by the mid 1950s. During the 1970s, there was a huge proliferation of massive hydraulic fracturing, resulted in an enormous number of wells that were stimulated by fracking. By the late 1970s, the process was widely used all different countries and religions, including Canada, Germany, Netherlands and England. It was not until 1999 that scientists found a new method to apply high pressure fluids to rubblize hard-rock formations and extract oil and gas trapped inside. Also, with the invention and application of horizontal drilling to fracking, it became possible to extract larger amounts of oil and natural gas from fracking shales. This absolutely has brought a revolution for the oil and gas industry of the U.S and changed the U.S energy picture from scarcity to abundance. Producers and drillers are now able to exploit a huge amount of natural gas and oil that were locked away in shells and hard rock formations previously. According to many credible reports, about 90 percent of today’s producing wells are stimulated by fracking; up to 35 percent of U.S natural gas production is from shale gas, compares with only 2 percent ten