Gigante-1A (G-1A) is a well that is located in Upper Magdalena Valley in Colombia, South America. It has been producing for almost 10 years today. There are several wells in this area that have been producing from sandstone and carbonate/dolomite reservoirs at different depths for more than 30 years and are still drawing interest from producers. There is a high interest in new well construction based on experiences from G-1A related to drilling, completion, production stages, reservoir analysis with stimulation techniques, and response-related identification of formation damage. A second well at the same depth is currently in progress. The specific condition of water, oil, and gas flowing commingled to surface from the same zone, covering sandstone and carbonate formations with significant petro-physical differences and reservoir fluids has allowed for the establishment of best practices and identified areas of research to get improved responses. A continuous learning curve focused on improving operational procedures and placement techniques has been built according to the mechanical status of the well before each intervention. Periodical interventions focused on organic deposition, emulsion blockage damages, and scaling related problems have helped to establish operational and treatment design procedures which contribute to effective stimulation results. Continuous improvements related to chemical treatment designs, based on adjustments of formulations, radius of penetration, and placement techniques, have helped to ensure effectiveness. Chemical treatments have focused on organic, nature-related problems since the beginning. In particular, asphaltenes flocculation, have generated pore throat blockage because of asphaltenes deposition and emulsion blockage. Water cut increase over time has brought inorganic scaling problems. Corresponding solutions have been combined with organic stimulation treatments for removal and damage inhibition overtime. There is also a clear learning curve over the last seven years on well lifting in optimizing well production in conjunction with chemical treatments to maximize oil production. Introduction G-1A is geographically located southern department of Huila, about 26 kilometers southeast of the municipality of Gigante. This HPHT well produces from Tetuan formation, where it was completed in May 1998 for the perforated interval 15,372 to 15,430 ft, in 5-in. Liner N-80, 18#/ft, hung at 14,956 ft. 7-in. casing P-110 29#/ft, from surface to casing shoe at 15,349 ft. The target zone in G-1A well in particular combines sandstone and limestone interval lengths along the perforated interval, where the bottomhole reservoir temperature has been identified as 268.5° F. A summary of current downhole conditions according to the most recent production report has been compiled in terms of well characterization related to main reservoir properties, formation fluid data, and current artificial lifting system (Table 1). G-1A has been periodically stimulated for almost eight years after confirming oil reserves through openhole log analysis, reservoir studies, hydraulic fracturing responses previous a blowout in 2000, PBU indications, and nodal analysis after blowout. Formation damage has been considered since the beginning of stimulation treatments after blowout. The blowout was a critical event during well history since a significant impact was made on the mechanical configuration at downhole conditions. Consequently, water reservoir communication has been highly estimated.
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