INVESTIGATION OF THE EFFECT OF STIMULATION TREATMENT AND CERTAIN PARAMETERS ON GAS WELL DELIVERABILIITY BY USING DIFFERENT ANALYSIS APPROACHES

Abdelrahman Elkhaiat, Sayed Gomaa

Abstract


This paper assesses the impact of a stimulation treatment on a gas well deliverability. Modified isochronal test is conducted on a gas well prior to and after a stimulation treatment. The stimulation treatment has increased the deliverability of the well as expected and the treatment is proven justified. This work also compares between the different analysis approaches, empirical, pressure, pressure squared, and pseudo-pressure approaches. This comparison is conducted on modified isochronal test data for several wells to check the accuracy of each analysis approach. The pseudo-pressure approach is the most accurate one as it takes into account the variation of fluid properties with varying reservoir pressure. The results obtained by other approaches are compared to the pseudo-pressure approach and their error percentages are presented. The effect of several parameters on well deliverability is also investigated. The results obtained by both empirical and pressure squared approaches are compared for the parameters. A spreadsheet programwas developed to analyze deliverability tests data by the different analysis approaches. The validity of the developed spreadsheet program was checked by comparing its results with both analytical solution and the results obtained by commercial software. Increasing reservoir temperature would affect gas viscosity and gas compressibility and result in an overall decrease in well deliverability. Decreasing skin factor would increase the deliverability but Darcy’s equation tends to overestimate deliverability at high negative skin values.

Keywords


Deliverability, stimulation. Modified isochronal, viscosity, temperature, pressure squared

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