soil capital
3.The extended reach wells (ERW) can provid with a series of economic and social benefits, such as reducing the expense in the oil reservoir exploring and exploiting, shortening the time of field constructing, quickening the capital reclaiming, dropping the soil wasting and environment polluting and so on.
4.In this paper, DEA Model, which is constructed for appraising the advance of science &technology of hydraulic conservancy, chooses 30 provinces (municipalities, autonomous regions) as Decision Unit, capital construction investment as Input Index, flood control, irrigation, waterlogging prevention, alkali harnessing, water and soil conservation, water supply in cities, hydropower, drinking water for people and livestock as Output Index.
