It is called secondary oil recovery when the reservoir water or non-mixed gas to add oil layer energy to promote the oil to move to well, and thus further extraction of crude oil in the oil field could be developed. As the composition of the oil layer of rock particles size is not uniform, irregular shape, resulting in different layers of pore size, permeability heterogeneity. The greater the permeability of the oil layer of oil and water flow resistance is smaller, oil and water interface, the faster the rate of advance. In addition, the viscosity of water is smaller than that of crude oil, which means that the resistance of the oil layer to the crude oil is larger than that of the water. The migration rate of the water in the oil layer is larger than that of the crude oil, causing the oil and water interface in the oil layer to be the same as the finger Qi, in the oil field development referred to as the phenomenon. After a period of time, the phenomenon refers to the formation of some of the larger flow channel to form a continuous passage of water to the wells, oil wells rapidly rising. When the oil well reaches 95% -98%, the continued water injection will lose the value of economic exploitation. At the same time, the oil-water interface of the relatively low permeability reservoir is almost no advance. The secondary recovery rate of oil recovery is usually 30% -40%, so the secondary oil recovery after more than half of the crude oil to stay in the reservoir. To take physical, chemical, biological technology continues to crude oil production in the oil field development which is called Enhanced Oil Recovery (EOR).