Characteristics of Fracturing Fluid Invasion Layer and Its Influence on Gas Production of Shale Gas Reservoirs

With the increase of shale gas resource exploitation in our country during recent decades, situations low production, fast production decline rate, and flowback rate have been appearing field production. It is an urgent problem to be solved it therefore necessary study interaction reservoir detained fracturing fluid. In this paper, Longmaxi Formation samples Sichuan Basin were selected for a water invasion experiment. The fracture propagation law, front location, thickness deep shallow reservoirs after compared analyzed by CT scanning technology. Based on analysis experimental mechanism, numerical simulation model was established. dimensionless permeability fluid layer introduced analyze positive negative effects retention reservoir. results show that hydraulic wells, can quickly enter complex network, then slowly matrix under various mechanisms form layer. Compared with reservoirs, lower porosity permeability, which propagates microfractures induced retention, smaller thickness. Both effect damage microfracture formation exist simultaneously. higher more network formed fractured will be, resulting longer stable period better development effect. When greater than 1, is, when greater, thicker be. Combining characteristics development, key obtaining high productivity well optimize soaking time speed order extend period. influence are deeply studied, provides certain theoretical basis optimization extraction technology improvement gas–water two-phase prediction method horizontal wells.