Study on Flow Field Evaluation and Adjustment Countermeasures of Low Permeability Reservoirs in Bohai Bay Basin

The reserves of low-permeability reservoirs account for a relatively large proportion in Bohai Bay Oilfield. The key to ensuring the effect of waterflooding development in low-permeability reservoirs is to establish a suitable reservoir flow field evaluation system. However, the current research on the flow field of low-permeability reservoirs in Bohai Bay Basin has problems of uncertain description methods, unclear characteristic parameters, prominent dynamic and static contradictions, unclear selection of fine flow field evaluation indicators for strong heterogeneous low-permeability reservoirs, and difficulty in establishing a flow field evaluation system. Therefore, related technical researches are carried out to improve the degree of water driving in low-permeability reservoirs and enhance the recovery factor. By sorting out and deepening the fine description results of block reservoirs, using logic analysis method and principal component analysis method to carry out the flow field evaluation index screening, using multiple algorithms to calculate the weight value, and through multiple iterations to describe the strength of the reservoir flow field, a quantitative evaluation system for the flow field of low-permeability reservoirs is established, formulating corresponding flow field adjustment countermeasures, and conduct tests and applications in Nanpu 4-1 block and Nanpu 4-3 block. The research results have successfully improved the degree of water drive IFEDC-202315264 2 in low-permeability reservoirs, and the reduction of old wells has been greatly reduced, achieving the purpose of improving the remaining oil recovery in low-permeability reservoirs. A screening and quantification system for self-developed flow field evaluation indicators suitable for low-permeability reservoirs in Bohai Bay Basin has been established.