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Thule Air Base is the U.S. Armed Forces’ northernmost installation, located 750 miles north of the Arctic Circle, in Greenland. Recently, Jacobs Engineering Group selected ZEBRA Environmental to participate in two subsurface investigation projects at Thule.

Whether drilling water wells or for geothermal loop installation, many factors must be taken into account when grouting.

"In order to deal effectively with reactive clays, a drilling contractor must be able to identify reactive soil conditions, understand how and why clay reacts the way it does, and know how to modify the behavior of reactive soils."

Last month, we talked about friction loss due to pressure drop, with a look at the factors that contribute to friction loss – flow velocity, pipe size, length of pipe,

"I usually can recognize the professional drilling contractor when I drive up to a drill site ..."

Read and reminisce about vehicles of the past.

From the desk of ND's editor.

Why is it so hard for supply to keep up with even diminished demand?

It has been stated that western Pennsylvania holds the largest-known deposits of clean-burning natural gas in the world. Local landowners are benefiting, and the state’s economy is growing its tax base – all the while supplying clean energy for our country. 

The 2010 Conference & Expo of the International Ground Source Heat Pump Association was held Oct. 27-28 in Denver. The show reflected the industry’s growth with an impressive depth and breadth of educational offerings.