"Such as shale gas, tight oil exploration and development of unconventional oil and gas resources, change the situation in the world oil and gas industry, but also create important opportunities for pipeline construction. "Secretary-General Torstein's view of the international gas Union, widely recognized by experts. The International Energy Agency said global unconventional gas will enter a golden development period. By 2035, shale gas, unconventional gas production, gas supply increase of nearly 2/3 per cent, share in the total amount of natural gas also rose from 14% to 32%. The International Energy Agency also pointed out that, over the forecast period, United States and China's largest non-conventional natural gas-producing countries.