Production data analysis method for shale gas well with varying production system

Abstract

The invention provides a production data analysis method for a shale gas well with varying production systems, and belongs to the field of oilfield development. The method comprises: (1) establishinga shale gas well test analysis model; (2) obtaining production data and required basic data; (3) calculating output regularized pressure and an output regularized pressure differential coefficient, drawing a double logarithmic chart, the double logarithmic chart including two curves of a double logarithmic curve for the output regularized pressure and material balance time, and a double logarithmic curve for the output regularized pressure differential coefficient and material balance time; or calculating output regularized pressure integral and an output regularized pressure integral differential coefficient, drawing a double logarithmic chart, the double logarithmic chart including two curves of a double logarithmic curve for the output regularized pressure integral and material balancetime, and a double logarithmic curve for the output regularized pressure integral differential coefficient and the material balance 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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