A method for analyzing production data of shale gas wells with production system changes

Abstract

The invention provides a method for analyzing production data of shale gas wells with changing production systems, and belongs to the field of oil field development. The method includes: (1) establishing a well testing analysis model for shale gas wells; (2) obtaining production data and required basic data; (3) calculating production-normalized pressure and production-normalized pressure derivative, and drawing a double-logarithmic graph. The logarithmic chart includes two curves: the double-log curve of production-normalized pressure and material equilibrium time and the double-log curve of production-normalized pressure derivative and material equilibrium time; or calculate the production-normalized pressure integral and production-normalized pressure Integral derivative, draw a double logarithmic chart, the double logarithmic chart includes two curves, the double logarithmic curve of the production normalized pressure integral and the material equilibrium time, and the double logarithmic curve of the production normalized pressure integral derivative and the material equilibrium time.

Description

technical field [0001] The invention belongs to the field of oilfield development, and in particular relates to a method for analyzing production data of shale gas wells with changing production systems, which is applied to well test analysis and dynamic description of shale gas wells. Background technique [0002] Well testing is based on the theory of seepage mechanics, using testing instruments as a means to study and determine the production capacity and physical parameters of test wells and oil, gas, and water layers by measuring production dynamic data such as oil, gas, water, and well pressure and production. As well as the technology of distinguishing the connection relationship between wells or layers, it plays an extremely important role in the exploration and development of new oil and gas fields and the dynamic adjustment of old areas. In order to understand the parameters of a specific well and the corresponding reservoir, according to the different sources of d...

AI Technical Summary

Problems solved by technology

[0006] (1) The well test analysis is mainly carried out by fitting the pressure and pressure derivatives with the log-logarithmic chart of the material balance time, with little or no concern for the historical fitting effect of pressure and production data;

[0007] (2) The effect is good for wells that have no change in production system (opening and closing of wells, changing nozzle size, interference between wells) within the analyzed period, but the effect is very poor when the production system changes frequently

[0008] Because shale gas wells are often accompanied by frequent production system changes during production, the quality of production data is usually poor, and pressure and production data are often intermittent, fluctuating or even missing, so the existing production data analysis methods cannot achieve effective analysis. The error in analysis, history fitting of pressure and production is very large, and the interpretation results have strong uncertainty and multi-solution

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