Design and Performance of Chuchupa 14 - First Horizontal Gas Well, Offshore Colombia
- W.S. Bill Huang | Mike R. French | Barry N. Markitell
- Document ID
- Society of Petroleum Engineers
- International Meeting on Petroleum Engineering, 14-17 November, Beijing, China
- Publication Date
- Document Type
- Conference Paper
- 1995. Society of Petroleum Engineers
- 1.6.6 Directional Drilling, 1.8 Formation Damage, 2.7.1 Completion Fluids, 3.2.3 Hydraulic Fracturing Design, Implementation and Optimisation, 2 Well Completion, 7.3.3 Project Management, 2.4.3 Sand/Solids Control, 5.1.7 Seismic Processing and Interpretation, 4.6 Natural Gas, 1.6 Drilling Operations, 5.5 Reservoir Simulation, 4.3.4 Scale, 5.6.1 Open hole/cased hole log analysis, 2.2.2 Perforating, 1.12.1 Measurement While Drilling, 5.5.8 History Matching, 1.12.2 Logging While Drilling
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In November 1992, a 2000-ft horizontal well was drilled in the Chuchupa Field, offshore Colombia. Chuchupa is a major gas field in Colombia, contributing about 90% of the gas supply for electricity generation on the northern coast of Colombia. This paper documents the selection, planning, reservoir simulation, drilling, completion and operation phases of this project. The horizontal well, Chuchupa 14, was successfully drilled from an offshore platform in 200 ft of water with a total horizontal displacement of 2000 ft. The entry point of the horizontal well is 6300 ft away from the platform. The formation is a semi-consolidated Chuchupa sandstone at a depth of 5325 ft sub sea, with average thickness of 167 ft, and average permeability of 209 md. Initial production test indicated that the well could be produced at 60 MMSCF/day on a 44/64" choke. This production rate is 4 to 6 times that of a conventional vertical well. Currently, the well is being produced from 40 to 60 MMSCF/day. In this application, the horizontal well can replace at least four vertical wells. With the development of horizontal wells, a significant amount of savings can be realized with fewer platforms and wells needed to develop the remainder of the field.
The natural gas in the northern coast of Colombia is primarily supplied by two gas fields jointly operated by the Texas Petroleum Company and Ecopetrol. The Ballena Gas Field and the Chuchupa Gas Field in the Guajira area, shown in Figure 1, provided more than 90% of the gas supply for electricity generation in the coastal area. While the Ballena Field is partially onshore, the Chuchupa Field is about 7 miles offshore. The original gas in place for Ballena and Chuchupa are 1.5 and 4.2 TCF, respectively. Gas recovery in both fields is 30% and less than 30%, for Ballena and Chuchupa, respectively.
According to a previous reservoir simulation study, some of the existing wells in the Chuchupa Field may face water breakthrough in a near future, therefore replacement wells are needed to insure a continuous supply of gas from this field. Horizontal wells are one of the option to be considered.
Figure 2 shows the isopach map of the Chuchupa Field with its discovery well Chuchupa 1 near the center of the field and the 8 vertical producers drilled from the platform. When the field was first placed on production in October 1979, the rate was at about 100 MMSCF/day. As of December 1991, 450 BCF of gas had been produced from the field with the average production rate of 104 MMSCF/day or 13 MMSCF/day/well for the 12 year period. Before the horizontal well was drilled, production from the eight vertical wells was 140 MMSCF/day.
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