Analysis of Factors Affecting the Production Capacity of Diamond-shaped Anti-Nine-point Fracturing Well Network in Chang 8 Reservoir of Heshui Oilfield

Abstract

The Chang 8 ultra-low permeability reservoir in Heshui Oilfield has a typical “three low” characteristics. The reservoir economic development needs to use fracturing to increase the productivity of single well. Based on the theory of multiphase seepage, the author is based on the Heshui Oilfield. The seepage characteristics of the rhombohedral anti-nine-point fracturing well pattern in low-permeability reservoirs were studied in a zoning study, and an oil-water two-phase seepage model considering non-Darcy matrix seepage zone, elliptical radial flow zone and pressure crack control zone was established. The results show that in the initial stage of vertical well fracturing well pattern development, the smaller the well spacing, the higher the oil production, but the faster the water content rises. In the initial stage of small row spacing, the vertical well fracturing well spacing has little effect on the accumulated yield, but the water cut in the small row is faster. The row spacing should be optimized reasonably. The larger the crack length, the higher the yield and the water content. The faster the ascending speed is, the larger the flow capacity of the pressure crack is, the larger the accumulated capacity is. As the fracture conductivity increases, the increase of the cumulative yield becomes smaller, and the water content increases faster. The direction of the injection well and the main crack The angle of the pair is small for the output.