Study on Influencing Factors of Stimulated Volume in Tight Reservoirs

Tight glutenite reservoirs are rich in resources and have bright prospects for exploration and development. Its basic characteristics are large oil-bearing coverage area of the reservoir, strong heterogeneity, low natural productivity, and difficult development. At present, volumetric fracturing technology of horizontal wells is the main production method. Optimizing fracture parameters and increasing stimulated reservoir volume are important in the long-term and efficient development of tight glutenite reservoirs. Based on the characteristics of tight glutenite reservoirs, the fracture complexity after fracturing and fluid mechanics, the mathematical equations for gas and water phases of artificial fractures, micro fractures and matrices, and numerical model of tight glutenite reservoir are established. On this basis, the three main factors affecting the stimulated reservoir volume of tight glutenite reservoirs are studied. The results show that: long fractures can effectively improve the stimulated reservoir volume for low permeability reservoirs; increasing the stage distance can effectively improve the stimulated reservoir effect for high-permeability reservoirs; tight gas reservoirs do not need too high conductivity. The research results of this paper have certain theoretical significance and provide important basis for the design of fracturing schemes for tight glutenite reservoirs.