Waterflooding Development Technique Of Mesozoic Erathem Block Jin-150

Block Jin-150 is a low permeability water-sensitive reservoir. In view of the characteristics such as the block developing on natural energy, the fast drop of formation pressure and the low recovery ratio, some methods have been taken in order to make more effective development.These are the dividing and delicate comparison of the formation, the delicate research of structure, the research of depositional microfacies and characteristics of reservoir and formation.On the base of knowing the geology characteristics of the block structure, the reservoir development and the oil-water distribution, some researches about the effect rating on block structure development, the distribution rule on remaining oil and the adaptability of flooding pattern with digital , delicate water flooding technique and the analysis of effect have been done. The next concrete scheme used to improve the development effect is taken. Some pilot water injection projects about field have been done in view of the problems and the technological difficulties in the process of the low permeability water-sensitive reservoir's water flooding development. The injection test indicates that the appropriate antiswelling measure before water flooding, the high compatibility between the formation and the flooding water and the low content of impurity in the flooding water are the keys of successful water flooding in this kind of reservoir. Through the research about the appropriate flood pattern, a lot of work is done to synthetically administer the block structure. They are improving the flood pattern and degree of water drive, supplementing producing energy and transforming to water flooding.The development effect is remarkably improved after the block structure having transformed to water flooding. It shows that the flood pattern of the block structure is becoming better, the formation pressure is recovering and the oil production rate is rising. The wells benefit from the optimization of water flooding parameters and the degradation of vertical problems.The degree of producing reserves is improved through separate injection and the low vertical problems.The homologous relationship of injection is better. The plane problems of the block structure is down by changing the water flooding orientation and improving the swept volume and the efficiency of flooding water. When the delicate water flooding technique is taken, the development effect is remarkably improved.