Method and system for predicting hydraulic fracturing stratum effect

Abstract

The invention provides a method and a system for predicting a hydraulic fracturing stratum effect. The method comprises the following steps of executing the following iterative processing, calculatingmaterial balance quasi-time at each moment according to an initial value of well control geological reserves; generating a plurality of regularized yield coordinate points, regularized yield integralaverage value coordinate points and regularized yield integral average derivative coordinate points; simultaneously moving a plurality of coordinate points to respectively fit with a plurality of groups of preset curves; calculating well control geological reserves according to the moving transverse distances and longitudinal distances of a plurality of coordinate points when a preset condition is met; and judging whether the absolute value of the difference between the well control geological reserves and the well control geological reserve initial value is smaller than preset precision or not. When the precision is smaller than the preset precision, iteration is ended, the transformation effect of hydraulic fracturing on the stratum is predicted according to the well control geologicalreserves, otherwise, the average value of the well control geological reserves and the well control geological reserve initial value replaces the well control geological reserve initial value, iteration processing continues to be executed, and the transformation effect of hydraulic fracturing on the stratum can be accurately predicted.

Description

technical field [0001] The invention relates to the field of natural gas development, in particular to a method and system for predicting the effect of hydraulic fracturing formations. Background technique [0002] Gas well production data analysis method is also called modern productivity analysis method, which is an effective tool for analyzing gas well production data. It uses production decline dimensionless curve chart to analyze gas well production data. In the process of theoretical research on productivity analysis of modern gas wells, an obvious progress is the use of "mass balance pseudo-time", emphasis on the application of pseudo-steady-state seepage equation, and full application of Duhamel convolution theory to deal with both variable production and variable flow pressure The problem. Since the physical properties of reservoir gas such as viscosity and compressibility are functions of system pressure, the gas seepage equation is strongly nonlinear. By using Ru...

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Problems solved by technology

[0003] At present, conventional analysis methods are difficult to predict the effect of hydraulic fracturing, and there is a large deviation between the predicted effect and the actual situation, wasting time and cost

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