PRODUCTIVITY PREDICTION AND FRACTURE PARAMETER OPTIMIZATION OF STAGED FRACTURING IN HORIZONTAL WELLS IN TIGHT RESERVOIRS

The development of tight reservoir is difficult, and the production cost of staged fracturing horizontal well technology is usually high. The productivity of horizontal wells is directly related to the economic benefits of oil and gas field development, and the productivity of fractured horizontal wells has attracted more and more attention. In this study, we analyzed the seepage characteristics of staged fracturing horizontal wells in tight reservoirs, and put forward a new productivity model to predict the productivity of fractured horizontal wells in the reservoirs. Further, the crack parameters such as length, spacing, conductivity, was optimized, respectively. The experimental results showed that the average permeability of tight reservoir is 0.43mD, and the average movable fluid in the area is 44.80%. The calculation result of the productivity formula of horizontal wells proposed in this study is higher than that of Lang Zhaoxin, and the fractures in the productivity formula have limited conductivity. The production of fractured horizontal wells is positively correlated with reservoir permeability, reservoir supply radius and fracture half-length, and negatively correlated with reservoir crude oil viscosity and fracture spacing (equal spacing). With the increase of fracture conductivity, the production of fractured horizontal wells tends to be gentle. The model proposed in this study provides theoretical support for the staged fracturing productivity of horizontal wells in tight reservoirs.