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• W4240364098 abstract "Heavy Oil Carbonate: Primary Production in Cuba G.E. Smith; G.E. Smith Sherritt International Corporation Search for other works by this author on: This Site Google Scholar G. Hurlburt; G. Hurlburt Sherritt International Corporation Search for other works by this author on: This Site Google Scholar V.P. Li V.P. Li Sherritt International Corporation Search for other works by this author on: This Site Google Scholar Paper presented at the SPE International Thermal Operations and Heavy Oil Symposium and International Horizontal Well Technology Conference, Calgary, Alberta, Canada, November 2002. Paper Number: SPE-79002-MS https://doi.org/10.2118/79002-MS Published: November 04 2002 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Get Permissions Search Site Citation Smith, G.E., Hurlburt, G., and V.P. Li. Heavy Oil Carbonate: Primary Production in Cuba. Paper presented at the SPE International Thermal Operations and Heavy Oil Symposium and International Horizontal Well Technology Conference, Calgary, Alberta, Canada, November 2002. doi: https://doi.org/10.2118/79002-MS Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentAll ProceedingsSociety of Petroleum Engineers (SPE)SPE International Thermal Operations and Heavy Oil Symposium Search Advanced Search AbstractPrimary production has been carried out for more than 30 years from large overthrusted carbonate structures along the north coast of Cuba between Havana and Varadero. Long reach horizontal wells, with open hole completions, are used and extensive logging suites, including FMI, have been collected and analyzed. A huge amount of oil is held within the tight matrix but currently most of the produced oil is likely from macro and micro fractures, and breccia or vuggy porosity. It is postulated that primary production is supported by secondary gas in the fractures and foamy oil. The EXODUS simulator has been used to model the system in dual porosity mode demonstrating the coning of gas and water in the fracture system and production from a rim of oil in the fractures at the level of the wells. Field observations and well performance also demonstrate the presence of gas in the fracture system and the high permeability necessary to drain the viscous oil.IntroductionPrimary production has been carried out for more than 30 years from large overthrusted carbonate structures along the north coast of Cuba between Havana and Varadero. Sherritt International (Cuba) Oil and Gas has drilled ˜50 wells and operates ~80 wells in Cuba. Sherritt has ˜8x103 m3/d of operated gross daily production in Cuba, Figure 1, and ranks seventh among Canadian-based international producers based on production rates. As of December, 2001 Sherritt holds an interest in 9 PSC's in Cuba.Sherritt began operations in Cuba in 1992 by undertaking the recompletion of wells, primarily in the Boca de Jaruco, Varadero and Pina fields. Many of these wells dated from the period of Russian influence and production operations were still dominated by Russian ideas and the structural model was very complex. As experience was obtained, the overthrust models, more common in the Alberta front ranges, were applied and new seismic data was gathered and interpreted using prestacked depth migration and an overthrust structural model. The proximity to the coast and the ability to drill directionally or horizontally from there northward led to the building of two rigs and the drilling of exploratory and development wells starting in 1997.The other reservoirs now developed, from east to west, are Seboruco/Yumuri and Puerto Escondido/Canasi, Figure 2. As currently mapped, the structure from Seboruco to Canasi is more or less a single overthrust with multiple sheets Figure 3. This structure is approximately 20 km long and 3 km wide with up to 1 km of heavy hydrocarbon saturated carbonate; similar in scope to the giant fields of Masjid-i-Sulaiman and Haft Kel in Iraq or Qarn Alam in Oman1–2.The big difference between these reservoirs and those in Iraq is that the oil is heavy and viscous. The API gravity is near 10 degrees and a viscosity at reservoir conditions of ˜150–200 mPa.s (50 C, solution gas oil ratio Rsi ˜45 sm3/stm3, Psat ˜12 MPa). The challenge is to evaluate the producing mechanism and optimize the recovery in these natually fractured reservoirs with huge deposits of heavy oil.GeologyThe primary zone of interest in the YumurÍ Field is the Upper Jurassic-Lower Cretaceous Veloz Group (Figure 4). Within the Veloz Group, the Ronda and Cifuentes Formations are the most important reservoirs. These reservoirs are also the principal hydrocarbon producing horizons in the Puerto Escondido and Boca de Jaruco fields. Keywords: reservoir characterization, vega alta, cuba, primary production, enhanced recovery, varadero, permeability, veloz, thrust sheet, wellbore Subjects: Reservoir Characterization, Improved and Enhanced Recovery, Formation Evaluation & Management This content is only available via PDF. 2002. SPE/PS-CIM/CHOA International Thermal Operations and Heavy Oil Symposium and International Horizontal Well Technology Conference You can access this article if you purchase or spend a download." @default.
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