Evaluation of Gaoshiti Gas Reservoir and Acid Fracturing Technology based on Safe Environment-Friendly Chemical Tracer Test

Abstract

In recent years, the Gaoshiti gas reservoir of Sinian Dengying Formation in Sichuan Basin has realized large-scale exploitation. Compared with shale gas reservoir and conventional sandstone reservoir, the carbonate reservoir of Gaoshiti structure has the characteristics of large depth, high temperature, high sulfur content, etc., and most of the wells are completed by staged acid fracturing of horizontal wells and highly deviated wells. For many years, there has been a lack of effective production logging ways and the output contribution of each section is difficult to determine, and there is a lack of methods to comprehensively evaluate the main control factors of productivity, which makes the later development face a situation of great uncertainty and lack of basis for measure adjustment. In this paper, a new Safe Environment-Friendly Chemical Tracer Test (SECTT) is used to test the production profiles of 21 carbonate gas wells in Gaoshiti structure, Sichuan Basin. The segmented production performance data of these wells are obtained successfully. Through the analysis of the main factors affecting production in geological and engineering parameters, for the refined reservoir description, acid fracturing process optimization and regional development plan adjustment of Gaoshiti gas reservoir.

Copyright 2022, IFEDC Organizing Committee.

This paper was prepared for presentation at the 2022 International Field Exploration and Development Conference in Xi’an, China, 16–18 November 2022.

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