Block Che1 is a fault-block layered medium-high permeability edge water reservoir controlled by structure. It is a key exploration and development area in Dongfeng Port Oilfield and the second member of Shahejie Forma...Block Che1 is a fault-block layered medium-high permeability edge water reservoir controlled by structure. It is a key exploration and development area in Dongfeng Port Oilfield and the second member of Shahejie Formation is its main oil reservoir. At present, the comprehensive water cut of the block is 90.5%, and the recovery percent is only 14.3%. The whole block is in the stage of ultra-high water cut and medium-low recovery percent. With the rapid development of oil reservoir and the deepening of geological knowledge, the contradiction of multiple layers, thin layers and multi-layer commingled production in this block has become increasingly prominent, which results in the current small-layer water flooding and unclear distribution of remaining oil. In this paper, the 32 oil sand bodies in the second member of Shahejie Formation are divided into three types by using the fuzzy comprehensive evaluation method and the water flooding status and remaining oil distribution characteristics of different types of oil sand bodies are studied, and the remaining oil distribution patterns under four different controlling factors are established. On this basis, a sub-layer system centered on improving the control degree of water drive reserves and an injection-production well pattern simulating the rotation water injection of water drive wells with strong edges are formed. Through integrity optimization, the development effect of this block is effectively improved. The daily oil production capacity of the block has increased from 56.2t/d before adjustment to 89.6t/d at present, and the degree of water drive control has increased by 25.6%.展开更多
文摘Block Che1 is a fault-block layered medium-high permeability edge water reservoir controlled by structure. It is a key exploration and development area in Dongfeng Port Oilfield and the second member of Shahejie Formation is its main oil reservoir. At present, the comprehensive water cut of the block is 90.5%, and the recovery percent is only 14.3%. The whole block is in the stage of ultra-high water cut and medium-low recovery percent. With the rapid development of oil reservoir and the deepening of geological knowledge, the contradiction of multiple layers, thin layers and multi-layer commingled production in this block has become increasingly prominent, which results in the current small-layer water flooding and unclear distribution of remaining oil. In this paper, the 32 oil sand bodies in the second member of Shahejie Formation are divided into three types by using the fuzzy comprehensive evaluation method and the water flooding status and remaining oil distribution characteristics of different types of oil sand bodies are studied, and the remaining oil distribution patterns under four different controlling factors are established. On this basis, a sub-layer system centered on improving the control degree of water drive reserves and an injection-production well pattern simulating the rotation water injection of water drive wells with strong edges are formed. Through integrity optimization, the development effect of this block is effectively improved. The daily oil production capacity of the block has increased from 56.2t/d before adjustment to 89.6t/d at present, and the degree of water drive control has increased by 25.6%.
