A Calculation Method for Gravel Packing in Horizontal Wells

Abstract

The invention discloses a horizontal well gravel filling simulating calculation method. The method comprises the following steps that according to the size parameters of a filling tool and the stratumparameters, the annulus flow velocity and the displacement for maintaining balance embankments under different sand dune ratios are calculated; the friction resistance and the pressure drop of the annulus section of the filling operation horizontal section are determined according to the annulus flow velocity and the displacement; the mass conservation law is utilized to establish a balance equation of a screen tube and a stratum annulus system and a balance equation of the screen pipe and a flushing pipe annulus system, and according to the principle that the pressure gradients of the two systems are equal, the annulus flow velocity and the displacement of a flushing pipe and the screen pipe are regressed; the pressure drop of each manifold node of the inflow section and the pressure drop of each annulus node of the filling back-out section in the gravel filling operation are calculated; according to the annulus flow velocity, the displacement, the friction resistance, the pressure drop and the pressure drop of each annulus node, the pressure generated by alpha waves at the bottom of the screen pipe, the pressure generated during beta wave operation and the stratum fracture pressure in the filling operation are calculated; and the displacement of different sand dune ratios, the pressure generated by the alpha waves under different types of displacement, the pressure generatedby different beta waves and the stratum fracture pressure are drawn and summarized, and the selection of field operation parameters is optimized.

Description

technical field [0001] The invention relates to the field of sand control in oil production wells, in particular to a method for calculating construction parameters and construction time of gravel filling operations in horizontal wells, and belongs to the field of petroleum and natural gas engineering. Background technique [0002] Horizontal well gravel packing operation is an effective method for sand control in open hole completion of unconsolidated reservoirs. At present, for the design of horizontal well gravel packing operation, three methods are generally used to determine parameters in the early stage simulation calculation. The first is to use the models summarized by previous indoor simulation experiments of solid-liquid two-phase flow for calculation; the second is to determine the on-site pump displacement, sand ratio and other parameters through the years of work experience of sand control engineers; the third is to use fluid simulation simulation software to si...

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Problems solved by technology

Among them, indoor simulation experiments can only simulate the flow state of two-phase flow in horizontal pipes with a certain distance and length. Due to the limitation of the experimental site, it is difficult to simulate the flow law of the entire well section from the surface manifold to the bottom of the horizontal well during gravel packing operations.

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