Be concerned about the cost of technology, environmental risk

U.S. shale gas development have become the "dark horse" because of its mastery of the formation hydraulic fracturing. However, this technique can successfully be applied to other countries, the cost of this technology the economic benefits of how it?
Higher cost of  shale gas  development to become investors concerns. Information from solid to extract shale gas is the cost of natural gas per thousand cubic feet 5-6 U.S. dollars. The technology required to reach thousands of meters deep drilling and horizontal drilling needed in the gas layer several kilometers. Then the wells into the mud pressure, quartz sand, chemical additives, shale fracturing, stretched cracks, increase gas flow. Finally withdraw all wastewater to be handled or stored in the ground, which lead to the development costs.
In addition, there is shale gas "gas pressure is relatively low, well production is low, low recovery, high investment, production decline fast, long production cycle" feature, which also determines the exploitation of shale gas must fight more wells to replace production, to achieve economies of scale only. Insiders said that shale gas as a high-risk, high-return industry, its development model still need to consider discussed.
Meanwhile, the impact of shale gas at a lower price the developer's enthusiasm. Formation fracking are innovative drilling methods, but its high cost, relatively inexpensive shale gas, which leads to shale gas development costs and the economic benefits are not proportional. This will also affect the size of shale gas development.
And the development of the environmental impact of shale gas is also wide attention.
From Cornell University study reported that shale gas on the extent of the impact of global warming than conventional gas and coal, thus, shale gas, "clean carbon" energy effect is not obvious. Second,  Hydraulic fracturing  techniques need to consume a lot of water and not recyclable. As hydraulic fracturing process requires the use of a large number of toxic chemicals containing lysate, if not treated, or there is a leak,ceramic proppant it will result in the construction area and downstream basin groundwater contamination.
Experts also worry that the exploitation of shale gas requires high pressure is applied to the underground, there is a hidden danger of geological disasters triggered.