Journal of Southwest Petroleum University(Science & Technology Edition) ›› 2021, Vol. 43 ›› Issue (5): 113-136.DOI: 10.11885/j.issn.1674-5086.2021.02.25.01

• A Special Issue on Unconventional Oil and Gas Development • Previous Articles     Next Articles

Research Progress on Fluids Flow Mechanism and Mathematical Model in Tight Oil Reservoirs

CAO Renyi, CHENG Linsong, DU Xulin, SHI Junjie, YANG Chenxu   

  1. College of Petroleum Engineering, China University of Petroleum, Changping, Beijing 102249, China
  • Received:2021-02-25 Published:2021-11-05

Abstract: Tight oil reservoirs have great potential and wide distribution in China. Nowadays it has become an important guarantee for stable and high production of Changqing, Daqing, Xinjiang and Jilin oilfields in China, and it is also the hotspot and difficulty of global oil and gas development. Tight matrix is characterized by tight rock and its porosity and permeability are very low. The influence of micro-scale flow effect is significant due to its submicron main throat. The traditional fluids flow theory of oil and gas cannot accurately describe the flow law of this kind of reservoir. The exploitation of such reservoirs is accomparied by the difficulties in oil flow and flooding and low production. Generally, horizontal well and hydraulic fracturing are used to realize efficient development of tight oil reservoir. This paper expounds the latest research progress of fluids flow mechanism and mathematical models of tight oil reservoir:flow mechanism and mathematical model of micro-nano pore and throat; stress sensitivity and mathematical model of tight oil reservoir; nonlinear mathematical model for tight oil reservoir; pore network simulation and nonlinear flow law; coupled flow between tight matrix and fracture. We summarize the development trend of these key scientific problems, which has important theoretical significance for the scientific and efficient development of tight oil reservoirs.

Key words: tight oil reservoir, micro-nano scale, boundary layer, nonlinear flow, pore network simulation

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