Optimization Design and Implementation of Oil Production Engineering Scheme on Upturn Development of Polymer Flooding in Class II Reservoir

In order to achieve economies of scale build productivity of polymer flooding upturn development, based on geological characteristics and mining status, aiming at the development difficulties of the injection and production well of class II reservoir in La oilfield, such as high completion cost, complex well condition and difficulty in plugging, and high energy consumption of conventional pumping unit, oil production engineering scheme revolves around the guiding ideology of “design the most efficient scheme with the best technology”. In accordance with the concept of promoting new technologies to improve development effects and benefits, the key oil production processes are considered and systematically optimized, and the combination of large pore volume and deep penetration perforating technology, expansion tube plugging technology, and ultra-long stroke oil production technology are optimized. Field implementation showed that through the comparison of the whole process, multi-dimension and multi-scheme optimization and technical and economic analysis, the well completion investment was saved 11.25 million yuan, the plugging investment was saved 20.4 million yuan, the later production and operation cost was reduced 440,000 yuan, and the accumulated oil increase was 97,800 tons, achieving a good development effect. It has formed a series of supporting technology of oil recovery engineering suitable for the economical and effective development of the Class II reservoir, which provides a technical reference for the excavation of latent remaining oil from the third stage of oil recovery in the old area of Chang yuan, and plays a leading role in oil production engineering scheme.