| In Ke er qin oil field, the average porosity is 17%, and the average permeability is 27×10-3μm2. The reservoir belongs to mid-porosity and low-permeability reservoir, and is developed with micro fracture. In the water flooding development in fractured low permeability reservoir, the injection water dashes along fractures and induces water breakthrough and watered out, then produced dominant channels and results in violent water flooding. As a result, the conflicts of single layer and inter layers are more intensified, and the water flooding efficiency of the injection water is reduced, then the oil recovery is impacted correspondingly. The reservoir shifts to water flooding in 2000, and the injection water breaks through along the fracture, and the production wells take effective responses for the regulation in 2.2 months, whereas, the reservoir is watered out in the following 2 months. Introducing deep profile controls in water injection wells, this paper analyzes and demonstrated the feasibility of deep profile controls in Ke er qin, and finds out the proper deep profile control technology. According to eight well-choosing principles, 6 wells are optimized to deep profile control. the profile control agent is filtered and demonstrated particularly by means of experiments. On the basis of the above research, the formation, agent and method of profile controls are optimized and decided, and, the detailed implement scheme of every well is worked out. After the field conduct, six well groups have effects, and injection pressure increased 2.9 MPa, while the intake profile obtains obviously improved.
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