Graphically Speaking: Fracking and Injection Wells

Last week’s National Research Council report on hydraulic fracturing and earthquakes pretty much ends up where a number of scientists are on the correlation between fracking and quakes: that energy development from shale formations poses a low risk for tremors of significance. The report said more attention should be given to injection wells, which are used for waste disposal by a number of industrial enterprises, not just the oil and natural gas industry. AP science writer Seth Borenstein’s take on the report is here.

API, America’s Natural Gas Alliance and the American Exploration & Production Council have produced a couple of informational tools on hydraulic fracturing and seismic activity and underground injection control (UIC) wells that are especially timely with release of the council’s report. 

Highlights from the fracking document:

Hydraulic fracturing is done with a mixture of more than 99.5 percent water and sand. The other one-half of 1 percent is chemical – including anti-bacterials and lubricants. See the FracFocus.org site for more on fracking fluids.Fracturing that occurs thousands of feet below the surface (and below groundwater aquifers) is carefully mapped with sophisticated equipment to optimize recovery of the oil and/or natural gas and to monitor the well itself. In other words, microseismic activity associated with fracking is thoroughly understood.

One study of several thousand shale fracture treatments across North America showed the largest micro-quake measured about 0.8 or about 2,000 times less energy than a magnitude 3.0 earthquake. The chart below shows that most of the micro-quakes in this study were 10,000 to 1 million times smaller than a 3.0 earthquake, which is roughly equivalent to the passing of a nearby truck:

Highlights from the UIC document:

The U.S. has about 151,000 Class II UIC wells used by the oil and natural gas industry, of which only a handful are being studied for possible links to earthquakes. These wells are a subset of more than 800,000 injection wells nationwide used to dispose of a variety of industrial wastes and for development of various minerals and geothermal energy sources. Here’s a map that shows the state-by-state well distribution:

Injection wells are regulated by EPA under the Safe Drinking Water Act. In many cases EPA has delegated authority for the UIC program to the states, with 39 states having primary authority over 95 percent of all UIC Class II wells.Literature published in the past five years shows that less than 40 incidents of seismic activity felt on the surface were associated with Class II injection wells.

Injection wells pump fluids into deep rock formations (see graphic). It’s unusual, but in some cases a quake can occur when a number of geological and operational factors come together – especially the presence of hard, dense and brittle crystalline “basement rock.”  These quakes are almost always small, below the level that would be felt on the surface.

For more information, check out the Energy From Shale website.

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Hailing the Chief’s Support for Natural Gas Development, Fracking

President Obama deserves credit for standing fast in his support for natural gas development through hydraulic fracturing – especially given the no-to-natural gas approach taken by some of his supporters in the environmental community, including the Sierra Club. Here’s the president on Monday in Cincinnati:

“… We’re moving in the right direction in terms of energy independence. Now, part of that is this boom in natural gas.  And this is something we should welcome, because not only are we blessed with incredible natural gas resources that are now accessible because of new technologies, but natural gas actually burns cleaner than some other fossil fuels, and is an ideal fuel -- energy source that we potentially can use for the next 100 years.  So I want to encourage natural gas production.  The key is to make sure that we do it safely and in a way that is environmentally sound.”

The president is spot on – and as a response to a negative question about natural gas, his remarks were all the more remarkable. Because of abundant, affordable gas, made accessible through fracking, the global energy balance could be shifting. The president continued:

“Now, you always hear these arguments that somehow there’s this huge contradiction between the environment and economic development, or the environment and energy production.  And the fact of the matter is that there are a lot of folks right now that are engaging in hydraulic fracking who are doing it safely.”

This also is true. The oil and natural gas industry has focused on making hydraulic fracturing safer and more efficient through a set of standards that guide operators, and it has worked with states to develop regulatory regimes tailored for their specific conditions. The president went on:

“The problem is, is that we haven’t established clear guidelines for how to do it safely, and informed the public so that neighbors know what’s going on, and your family, you can make sure that any industry that’s operating in your area, that they’re being responsible.”

Well, OK. The president is mistaken or misinformed on that point. Industry has been clear and detailed in developing the standards mentioned above. It also has supported FracFocus.org to create transparency about fracking itself – a website community members can use to learn where wells are being drilled in their area, as well as the chemicals being used in the fracking fluids themselves. The industry takes community engagement and support seriously and is committed to getting shale development right.

Back to the president:

“What we’ve said is, look, we are going to work with industry to establish best practices.  We are going to invest in the basic research and science required to make sure this is done safely and in a way that protects the public health.  And for responsible companies, they should be able to operate, make a profit, and we can all benefit and put people back to work."

Best practices, we’re on it, Mr. President. Industry also is supportive of new technologies to improve operations, including those to reduce or even eliminate water use during the fracking process. Shale energy is creating jobs, thousands of them, and boosting the economy.

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