What’s In The Water?: Fracking Chemicals Under Microscope
Wheeling WV Intelligencer
19
December 2010
By Casey Junkins. Staff Writer
WHEELING - Most natural gas companies note that between 98 and 99
percent of the 5 million gallons of fluid used to hydraulically
fracture a Marcellus Shale natural gas well consists of water and sand.
However, what concerns some residents - and even state agencies - when
it comes to the fracking process are the chemicals that make up that
remaining 1 to 2 percent of the mixture.
Think of it this way: if 1.5 percent of a fracking mixture is something
other than water and sand, then 75,000 gallons of chemicals found in
products such as antifreeze, laundry detergent and deodorant are being
pumped deep into the ground. Some are concerned that these chemicals
will contaminate the water supply, while the natural gas companies say
each of the chemicals has a role in ensuring the fracking process goes
as planned.
According to the Marcellus Shale Coalition, "hydraulic fracturing has
been effectively used to safely stimulate job-creating domestic energy
resources over 1.1 million times."
A typical Marcellus Shale well can be fracked numerous times during its
production life. The wells travel thousands of feet into the earth
before turning horizontally to reach gas pockets. After the wells are
drilled and the protective casing put in place, the fracking process
begins.
Petroleum services titan the Halliburton Co. pioneered the fracking
process in 1947, and company officials note the firm has performed work
in both West Virginia and Pennsylvania.
In fact, fracking has been a common occurrence in Wetzel and Tyler
counties for years - with no reported incidents of groundwater
contamination.
According to Halliburton, 98.47 percent of the material its workers use
for fracking consists of water and sand, leaving just 1.53 percent for
other materials. Some of the chemicals found in Halliburton's fluid
mixture include formaldehyde, ammonium chloride, acetic anhydride,
methanol, hydrochloric acid, and propargyl alcohol.
Halliburton officials note that almost 90 percent of onshore gas wells
require fracking. The company notes the fracking technique "starts with
a good bit of water and a lot of sand. Mix those two together, apply a
couple thousand pounds of pressure, and introduce them to a reservoir
several thousand feet below (ground), often with the help of a small
percentage of additives that aid in delivering that solution down the
hatch."
Halliburton notes that the force of the water being pumped into the
earth - which can be as high as 10,000 pounds per square inch - creates
tiny fissures in the Marcellus Shale formation. The sand portion of the
mixture then flows into these fissures and keeps them open. This
creates pathways for the previously trapped natural gas to escape. The
entire fracking process takes, on average, three to 10 days to complete.
The role of chemicals in the fracking process varies. According to
Chesapeake Energy, which says its most common fracking solution
contains 0.5 percent worth of chemicals, the chemicals and their roles
in the process include:
§ hydrochloric acid - found in swimming
pool cleaner, and used to help dissolve minerals and crack the rock;
§ ethylene glycol - found in antifreeze,
and used to prevent scale deposits in the pipe that lines the well;
§ isopropanol - found in deodorant, and
used to increase the viscosity of the fracture fluid;
§ glutaraldehyde - found in disinfectant,
and used to eliminate bacteria that can create corrosive by-products;
§ petroleum distillate - found in
cosmetics, and used to minimize friction;
§ guar gum - found in common household
products, and used as a gel to thicken the water and suspend the sand;
§ ammonium persulfate - found in hair
coloring, and used to delay the breakdown of guar gum;
§ formamide - found in pharmaceuticals,
and used to prevent corrosion of the well casing;
§ borate salts - found in laundry
detergent, and used to maintain fluid viscosity under high temperatures;
§ citric acid - found in soda pop, and
used to prevent precipitation of metal;
§ potassium chloride - found in medicine
and salt substitutes, and used to prevent fluid from interacting with
soil;
§ sodium or potassium carbonate - found in
laundry detergent, and used to balance acidic substances.
However, not every company uses the same fracking formula, emphasized
Pennsylvania Department of Environmental Protection spokeswoman Jamie
Legenos. She said her agency maintains a list of every chemical ever
used by a company that has performed fracking in the Keystone State.
In addition to the materials used by Chesapeake, some of the 85
fracking chemicals listed by the Pennsylvania DEP are xylene, toluene
and tetramethylammonium chloride - chemicals that can lead, with
prolonged exposure, to liver damage in humans and can even be fatal.
None of these chemicals appear to be used in fracking in West Virginia.
Marcellus Shale Coalition spokesman Travis Windle said of the fracking
formulations, "The small amount of other additives, used to kill
bacteria and reduce friction, are all listed on the (Pennsylvania
Department of Environmental Protection's) website. This long and clear
record of environmental safety is testament to the common-sense
regulations in place coupled with the industry's unwavering commitment
to protect the environment."
Much of the concern with fracking is that the chemicals are being
pumped underground, and that they could contaminate the water supply.
Drilling companies contend that they take adequate safety precautions
to ensure that doesn't happen, and note that the aquifer is at about
1,200 feet below the Earth's surface while fracking takes place a
minimum of 5,000 feet below that 1,200-foot depth.
Chesapeake, for example, notes workers install the following layers of
protection in each well to prevent chemical leaks:
§ surface casing
§ cement to seal this casing in place
§ production casing
§ cement to seal this casing in place
§ production tubing
§ an additional string of casing and
cement for some wells.
To date, it appears that most problems encountered with drilling seem
to come from inadequate casing during the initial phases of the
operation.
Ken Weir, spokesman for the Pittsburgh-based group
marcellusprotest.org, advised residents to look at the full picture
when considering any drilling proposal.
"If they tell me, 'If we don't drill this hole here, you won't have any
heat in your house next year,' that is ridiculous," he said.
"With all the problems (coal) mining has caused in this area, are we
willing to repeat that for a dollar bill?" Weir added.