| Abstract:The tight sandstone of the Liushagang Formation is one of the important targets for the exploration and development of the Fushan Oilfield in Hainan. Affected by complex structural evolution, the tight sandstone in this area has the characteristics of obvious thin interbedded sand and mud, low porosity, low permeability, and high temperature. In order to solve the problem such as the high construction pressure, out-of-control fracture height, sand plugging, and single well low output and rapid output decline after fracturing in the past reservoir reconstruction. Using unconventional stimulated reservoir volume fracturing technology for reference, followed by the use of variable displacement and artificial barriers to control fracture heights, temporary plugging and steering, etc., while further optimizing fracturing fluids, applying nano-synergy oil washing agent, and developing in the tight sandstone of Fushan Oilfield 4 well tests. The research results show that: unconventional stimulated reservoir volume fracturing technology can effectively reduce the risk of sand plugging and improve the improvement effect of tight sandstone reservoirs in Fushan Oilfield. The implementation of reservoir reconstruction techniques such as variable displacement, artificial barriers to control fracture heights, and temporary plugging to fracturing have effectively controlled fracture heights and increased the degree of pressure opening of the reservoir. The application of nano synergistic oil washing agent minimizes the damage of the liquid to the formation and fractures, exerts the effect of nano droplets to absorb and wash oil, and increases the stable production period of oil and gas wells. |