Progress and prospects of development technologies for low-permeability oil reservoirs in Shengli Oilfield

Shengli Oilfield has abundant low-permeability oil reservoirs with proven reserves of 1.18 billion tons， presenting a good prospect for development. However， there is a problem of inability to inject and produce during the development process of the oil reservoirs due to the low porosity， poor permeability， and strong heterogeneity of the low-permeability oil reservoir. A systematic review was conducted on the prediction and analysis methods for low-permeability oil reservoirs in Shengli Oilfield to achieve efficient development of low-permeability oil reservoirs， as well as efficient development technologies， and the advantages and disadvantages of existing technologies were analyzed to provide an outlook for the development technologies of low-permeability oil reservoirs. Based on research and practice， the following conclusions are drawn： ① Shengli Oilfield has developed fine reservoir characterization technologies such as reservoir prediction， in-situ stress prediction， and evaluation of reservoir heterogeneity. ② Based on theoretical and technological innovation， the physical limit of reserve production was constantly broken， forming differential development technology series， such as water injection development technology of horizontal wells in ultra-low permeability oil reservoirs， long well section multi-stage fracturing development technology of horizontal wells in tight oil reservoirs， well pattern adaptation technology for enhanced oil recovery of general low-permeability oil reservoirs， pressure flooding technology in low-permeability tight oil reservoirs， and viscous emulsion-surfactant flooding technology. Good development results have been achieved. ③ Combined with the actual needs of high-quality development and speed and efficiency improvement development of low-permeability oil reservoirs in Shengli Oilfield， the well pattern reconstruction technology of dual control streamline variation， CCUS technology， and nanobubble flooding technology were proposed， pointing out the development direction for improving oil recovery of low-permeability oil reservoirs.