Research on Residual Petroleum in Complex Ultra-low Permeability Fuyu Oil Layer in the Peripheral Area of Western Daqing City and Effect Analysis of Potential Tapping Countermeasures

Abstract

Qijiabei Oilfield belongs to ultra-low permeability and secondary pore development reservoirs. After years of water injection development, it is difficult to establish effective displacement, poor long-term low-efficiency wells and low development efficiency. problem. In view of the above problems, this paper uses fine reservoir description and multi-disciplinary integration technology to finely describe the fault location, subdivided sedimentary microfacies, partition segmentation fitting physical parameters and fine residual oil research, and find out the main problems of poor oilfield development. the reason. On this basis, according to the dynamic development characteristics, under the premise of quantifying the remaining oil to the permeability level, the targeted measures are formulated for the main remaining oil types, especially for the remaining oil with poor effect, according to the divisional adjustment ideas. The sub-well distinguishing area shall be formulated with individualized measures for tapping and digging potential, that is, comprehensively considering reservoir development, connectivity, and residual oil distribution rules, and implementing targeted oil and water wells corresponding adjustment and production techniques based on the detailed description of remaining oil. The water absorption ratio of oilfield sandstone increased by 8.4%, the output ratio of small layer increased by 18.7%, the natural decline rate decreased by 6.9%, the ultimate recovery rate increased by 1.22%, the oilfield development effect became better, and the research and synthesis of residual oil in complex ultra-low permeability reservoirs Digging potential provides a reference.