Optimization of Well and Layer Selection Method and Technology for Repeated Fracturing of Tight Sandstone Old Wells

It is difficult for tight sandstone reservoirs to keep stable production without drilling new wells. When the production drops, it is an important technical means to improve the productivity by repeatedly reforming the reservoirs to restore the production. In this paper, the tight sandstone reservoir of Chang7 reservoir in Dongrengou, the following combination reservoir, is taken as the object. On the basis of analyzing and evaluating the reservoir characteristics, the applicability of each method is analyzed by referring to the well and layer selection methods of repeated fracturing in various oilfields. Through numerical simulation, the fracturing process parameters are optimized, and it is concluded that the in-situ stress difference is linearly related to the initial pressure of new fractures in the process of repeated fracturing, and the effects of vertical wells and horizontal wells are different. However, the more working fluid and sand are pumped, the longer the fracture length formed by repeated fracturing.