Actas de congresos
Economic Evaluation Of Steam And Nitrogen Injection On Sagd Process
Spe Latin American And Caribbean Petroleum Engineering Conference Proceedings. , v. 2, n. , p. 1487 - 1492, 2010.
Thermal recovery methods made possible the production of heavy oil fields considered non-commercial with conventional methods of recovery. In this context, steam injection has proved to be a major cost-effective alternative for increasing the heavy oil recovery. Steam Assisted Gravity Drainage (SAGD) is one of the field proven improvements. It uses two horizontal wells with the steam injector above the producer, which stays at the base of the reservoir. Sweeping the reservoir with the growth of a steam chamber. The variations on conventional SAGD involving non-condensable gases show a new trend. Numerical results suggest that after a certain period of time operating only with steam is effective to inject only inert gas. In this process the steam chamber keeps growing even after the steamflood is stopped. The purpose of the gas injection is to maintain the reservoir pressure elevated to keep the oil production. The cumulative steam oil ratio has a downward trend, yielding a reduction in the project costs. In this paper, a numerical study of the SAGD method in field scale is conducted. The reservoir model is simulated with properties obtained from a Brazilian onshore field. The methodology used involves an investigation of the main parameters that influence the application of the method and, according to a sensitivity analysis. The aim is to determine the best time to start gas injection looking to maximize NPV. A commercial software is used to simulate the injection of nitrogen after steamflooding the reservoir in order to obtain the results that are used to perform the sensitivity analysis. It was verified that the steam injection rate and the bottom hole pressure are decisive parameters to be considered. The simulations show that the nitrogen injection after a determined period of time of continuous steam injection reflects in a reduction in the order of 40% of the steam oil ratio. However, the cumulative oil production is almost the same when compared with the conventional SAGD. Copyright 2010, Society of Petroleum Engineers.214871492Aherne, A.L., Maini, B., Fluid Movement in the SAGD Process: A Review of the Dover Project 7th Canadian International Petroleum Conference the 57th Annual Technical Meeting of the Petroleum Society, Calgary, Alberta, Canada, 13-15, June, 2006, , presented at theButler, R.M., Stephens, D.J., (1981) The Gravity Drainage of Steam-Heated Heavy Oil to Parallel Horizontal Wells, , JCPT, FebruaryButler, R.M., (1991) Thermal Recovery of Oil Bitumen, , Department of Chemical and Petroleum Engineering, Prentice Hall: New Jersey, USACanbolat, S., Akin, S., Polikar, M., Evaluation of SAGD Performance in the Presence of Non-Condensable Gases Petroleum Society's 5th Canadian International Petroleum Conference, Calgary, Alberta, Canada, 8-10, June, 2004Harding, T.G., Farouq Ali, S.M., Flock, D.L., Steam Performance in the Presence of Carbon Dioxide and Nitrogen (1983) J. Cdn. Pet Tech, p. 30. , September-OctoberLaboissière, P., (2009) Steam and Nitrogen Injection in Improved Heavy Oil Recovery, p. 141. , Campinas: UNICAMP, 2009. (Dissertation) - Master in Science and Petroleum Engineering, Faculty of Mechanical Engineering, State University of CampinasZhao, L., Law, D., Yuan, J.-Y., Numerical Investigation of Steam and Gas Mixing in Heavy Oil Production CSPG and Petroleum Society Joint Convention, Calgary, Alberta, Canada, June 14-18, 1999, , presented at theZhao, L., Law, D., Coates, R., Numerical Study and Economic Evaluation of SAGD Wind-Down Methods (2003) Journal of Canadian Petroleum Technology, 42 (1). , JanuaryLaboissière, P., Rios, V.S., Trevisan, O.V., Estudo Numérico da Injeção de Vapor e Nitrogênio no Processo SAGD International Rio Oil & Gas Expo and Conference, Rio de Janeiro, September, 2010, , Presented at the