Current Magazine

Scientist Proposes ‘Comminution’ as Alternative to Fracking

Posted on the 13 January 2014 by Dailyfusion @dailyfusion
Fracking the Bakken Formation in North Dakota. Fracking the Bakken Formation in North Dakota. (Credit: Joshua Doubek http://en.wikipedia.org/wiki/File:Frac_job_in_process.JPG)

Instead of pumping deep underground enormous amounts of water to fracture shale, Northwestern University professor Zdeněk P. Bažant proposes exploring an alternative to fracking: using the kinetic energy of high-rate shearing generated by an underground explosion to reduce the rock to small fragments, so as to release the gas trapped in its pores.

Hydraulic fracturing, popularly known as fracking—a method used to extract oil and natural gas from rock deep within the earth—has great economic benefits for the U.S. but not without environmental costs. While much less severe than those of coal technology, the costs include the danger of possible contamination of groundwater.

“We have verified that this method of fragmentation, broadly called comminution, works for predicting the effects of high-rate shearing of concrete under impact, and in principle it also should work for shale,” said Bažant, the Walter P. Murphy Professor of Civil and Environmental Engineering at Northwestern’s McCormick School of Engineering and Applied Science.

“The mathematics is similar. And the amount of contaminated water produced by comminution would be negligible—a significant advantage,” he said. “What is not clear yet is whether a sufficiently large zone of shale could be fragmented and whether the fragmentation would suffice to release the gas trapped in the pores.”

He evaluated computationally the comminution of solids with possible application to shale, and he outlined his theory in a paper published recently by the Proceedings of the National Academy of Sciences (see footnote).

“This theory is not proven for fracturing shale—we don’t know whether it would work—but it is an idea that is worth investigating,” Bažant said. “An oil company or a national laboratory would need to conduct experiments and learn how to handle the practical issues.”

Recent advances in drilling technology have resulted in an increased emphasis on tight shale gas, natural gas locked in joints and pockets within low-porosity rock. This source rock can be found deep underground in vast regions of the U.S., making hydraulic fracturing a national issue.

In fracking, a hole is drilled several kilometers down to the shale layer and then diverted for several kilometers horizontally. Water is pumped down under high pressure. The ingress of pressurized water from the horizontal bore creates cracks in the shale, releasing natural gas from its pores. But the process also returns to the surface highly contaminated water, which must be dealt with properly, something that is expensive and requires strict quality control, which can’t always be guaranteed.

In his PNAS paper, Bažant mentions an intriguing new alternative already thought of by some oil companies: instead of forcing water down, an electrical pulse arc could be used to generate sufficiently powerful explosions.

It remains to be verified whether the resulting shock waves would suffice to fracture a large enough region of shale and release the gas. Bažant’s method would allow analyzing it computationally. Should comminution succeed, virtually no contaminated water would come out of the well, Bažant said.

Bazant Z.P., & Caner F.C. (2013). Comminution of solids caused by kinetic energy of high shear strain rate, with implications for impact, shock, and shale fracturing. Proceedings of the National Academy of Sciences of the United States of America, 110 (48), 19291-4 PMID: 24218624

You Might Also Like :

Back to Featured Articles on Logo Paperblog

These articles might interest you :

  • Opera Review: A Piece of Fairy Cake

    Opera Review: Piece Fairy Cake

    Joyce DiDonato sings a radiant Cendrillon at the Met. by Paul J. Pelkonen The lighting department: Joyce DiDonata as Cinderella in Massenet's Cendrillon.Photo b... Read more

    8 hours, 15 minutes ago by   Superconductor
    CULTURE, THEATRE & OPERA
  • What Mother Can’t Get Her Childs Birth Date Right?

    What Mother Can’t Childs Birth Date Right?

    I haven’t blogged in about ten thousand years. Since the Earth is only around 6 thousand years old, I take full responsibility for messing up that Math for you... Read more

    9 hours, 51 minutes ago by   Rachel Rachelhagg
    FAMILY, PARENTING
  • FIREFIGHTER – Seattle Fire Department (WA)

    FIREFIGHTER Seattle Fire Department (WA)

    City of Seattle Fire Department, (WA) FIREFIGHTER Salary:  $72,900.00 annually ****To reserve your spot, please sign up!**** City of Seattle Fire Dept. (WA)... Read more

    11 hours, 54 minutes ago by   Firecareers
    SOCIETY
  • Afghanistan: Once Again a Pawn Between Two World Powers

    Afghanistan: Once Again Pawn Between World Powers

    by Jon PhillipsRESTREPO chronicles the deployment of a platoon of US soldiers at one of the most dangerous outposts in Afghanistan. Read more

    The 19 April 2018 by   Rvbadalam
    CURRENT, DEBATE, POLITICS, SOCIETY
  • Abu Dhabi to Dubai

    Dhabi Dubai

    Most of the people who are living in the United Arab Emirates. Trying figure out how to travel between Abu Dhabi to Dubai. On the positive side, traveling... Read more

    The 19 April 2018 by   Dubai City Company
    CAREER
  • Video: Kilimanjaro - Mountain of Greatness Trailer

    Video: Kilimanjaro Mountain Greatness Trailer

    This video is a trailer for a full-length documentary called Kilimanjaro: Mountain of Greatness. It follows mountain bikers Hans Rey, Danny MacAskill and Gerhar... Read more

    The 19 April 2018 by   Kungfujedi
    OUTDOORS
  • A Full Spectrum of Poses and Practices

    Full Spectrum Poses Practices

    by NinaOne of the reasons I started the Photo of the Day project on Facebook was because of the way older people are typically portrayed in the media: almost... Read more

    The 19 April 2018 by   Ninazolotow
    FITNESS, HEALTH, HEALTHY LIVING