A method for judging the staged fracturing effect of horizontal wells in low-permeability gas reservoirs

Abstract

The invention provides a hypotonic gas deposit horizontal well staged fracturing measure decision making method and belongs to the field of oil-gas field development. The method includes collecting fractured layer electric performance, physical performance, oil-gas possibility parameter, post-fracturing daily gas production quantity and opening flow capacity, applying mathematical statistics and the fuzzy mathematic theory, quantizing various parameters affecting fracture effect, calculating layer selection coefficient and conducting relevant analysis on layer selection coefficient and fracture effect to determine layer selection coefficient threshold that the fracture effective output corresponds to. When evaluation is conducted on the fracturing horizontal well section by section, fracturing is conducted on the well sections with layer selection coefficient reaching the threshold and is not conducted on the well sections with the layer selection coefficient not reaching the threshold. The method changes empirical performance and randomness of fracturing well section measure decision making of a horizontal well, improves accuracy and measure efficiency of horizontal well section fracturing measure decision making and hypotonic gas deposition development effect.

Description

technical field [0001] The invention belongs to the field of oil and gas field development, and in particular relates to a method for judging the staged fracturing effect of a horizontal well in a low-permeability gas reservoir. Background technique [0002] Since the introduction of fracturing technology in China, the decision-making method of well selection and layer selection has attracted great attention from engineers. However, in the early stage, judgment and well selection were mainly based on experience, which is very random, and the judgment coincidence rate is relatively low. Low; [0003] Later, with the maturity of formation testing technology, some oilfields qualitatively judge whether the fracturing of wells in test wells is effective or not according to the type of test curves and test interpretation results. Fracturing is effective, and it is judged that fracturing is invalid for low-pressure low-permeability, ultra-low-permeability, and energy-depleted curv...

AI Technical Summary

Problems solved by technology

[0005] In recent years, with the continuous maturity of horizontal well technology, the number of horizontal wells in my country has increased year by year, and the fracturing workload has also increased significantly. However, the success rate and efficiency of horizontal well fracturing are not high. Important Factors Affecting Fracturing Effect

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