Research and Application of Optimization Technology for High-Efficiency Fracturing and Packing Parameters of Unconsolidated Sandstone

Abstract

The fracturing and filling technology is expected to meet the dual needs of production stimulation and sand control of unconsolidated sandstone reservoirs, but there is no clear guiding method for the optimization of construction parameters, which hinders its efficient development. In order to study the optimization technology of high-efficiency fracturing and packing parameters in loose sandstone, this paper takes a loose sandstone reservoir in Liaohe Oilfield as the research object and firstly studies the fracture initiation and extension laws of loose sandstone fracturing based on really well and formation data and takes this as a physical. The model explores the migration law of proppant under different working conditions. Research shows that (a) the layered fracturing is more likely to form a fracture shape that meets the dual needs of filling and production enhancement. (b) Increasing the viscosity of the sand-carrying fluid is conducive to the migration of proppant to the far end, and increasing the sand ratio will make the proppant more easily suspended in the fracture, but it is not conducive to remote migration. (c) Taking “increasing viscosity + increasing sand ratio in a small range” as the optimization idea, the ideal filling parameters are preferably 85 mPa∙s sand − carrying fluid viscosity + 15 % sand ratio . The field application results show that the daily oil production of three wells after adopting this optimization method is 2.5-3.4 times higher than that of the adjacent wells at the initial stage of production and after stable production.