ANALYSIS OF TWO-PHASE PERCOLATION OF FRACTURED HORIZONTAL WELLS IN LOW PERMEABILITY OIL RESERVOIRS

According to flow characteristics of different flow areasof fractured horizontal wells in low permeability oil reservoirs, the vadoseregion of fractured horizontal wells can be divided into threedistricts, the non-Darcy flow district with a high speed controlled bycracks, the ellipseflow district and the matrix non-Darcy flow district. Two-phase porous flowmathematical models of matrix non-Darcy flow with start-up pressuregradient are built. The results indicate that the production goes with theincrease of fracture conductivity; the incremental scope of production decreaseswith the increase of production time; initial production of fracturedhorizontal decreases progressively with the increase of fracturelength, the incremental scope of production decreases with the increase offracture length; the production of fractured horizontal wells is the maximum in thesituation with a long median crack and a short two-way crack.