HARRISBURG, Pa. (AP) - Advances in hydraulic fracturing technology have powered the American natural gas boom. And now hydraulic fracturing could be increasingly powered by the very fuel it has been so successful in coaxing up from the depths.
Oil- and gas-field companies from Pennsylvania to Texas are experimenting with converting the huge diesel pump engines that propel millions of gallons of water, sand and chemicals thousands of feet down well bores to break apart rock or tight sands and release the natural gas trapped inside.
It's the latest way for drillers to become consumers of the product that they are making broadly available in large amounts - and extremely cheap. Production has increased so much that natural gas has flooded the market, dragging down prices and forcing companies to pull back on their plans to expand drilling while looking for new ways to use gas.
After the conversion, the engines will run on cheaper natural gas, or a blend of diesel and natural gas. That brings down costs and, theoretically, cuts down the sooty exhaust that comes from burning diesel.
A number of increasingly cost-conscious oil- and gas-field companies are already using natural gas to run trucks and drilling rigs. But what makes the conversion of the hydraulic fracturing pump engines to natural gas particularly challenging is the sheer number of engines running at once, and the amount of horsepower necessary to power the pumps.