Title: PVT characterisation and compositional modelling of gas condensate and volatile oil reservoirs

Authors: Baosheng Liang, Sriram Balasubramanian, Ben Wang, Clair Jensen, Anping Yang, Daniel Kennedy

Addresses: Reservoir and Production Engineering Department, Chevron Energy Technology Company, Chevron Corporation, 1500 Louisiana St, Room 25002, Houston, Texas 77002, USA. ' Reservoir and Production Engineering Department, Chevron Energy Technology Company, Chevron Corporation, 1400 Smith St, Room 38005, Houston, Texas 77002, USA. ' Southern Africa Business Unit, Chevron Global Upstream and Gas Company, Chevron Corporation, 1400 Smith St, Room 38002, Houston, Texas 77002, USA. ' Reservoir and Production Engineering Department, Chevron Energy Technology Company, Chevron Corporation, 6001 Bollinger Cyn Rd., Building D, D2038, San Ramon, California 94583-2324, USA. ' ACE Field Services, Inc., 7001 Corporate Dr., Suite 216, Houston, Texas 77036, USA. ' Southern Africa Business Unit, Chevron Global Upstream and Gas Company, Chevron Corporation 1400 Smith St, Room 38192, Houston, Texas 77002, USA

Abstract: In recent years, many gas condensate and volatile oil reservoirs have been discovered offshore. Many of these reservoirs are under high temperature and high pressure conditions. It is important to properly model and optimise gas condensate recovery during asset development in many oil and gas companies. A systematic approach to modelling gas condensate and volatile oil reservoirs by the use reservoir simulation is presented in this paper. The following topics are focused in particular: 1) simulation model selection; 2) generating a pressure-volume-temperature (PVT) model for modified black-oil models and tuning equation-of-state (EOS) parameters for compositional models; 3) initialising simulation model with a compositional gradient; 4) the concern of well deliverability caused by condensate banking effect; 5) development strategy – primary depletion or gas cycling; 6) PVT characterisation of liquefied petroleum gas (LPG) and quantification of LPG production under primary depletion and gas injection.

Keywords: gas condensate; volatile oil reservoirs; compositional reservoir simulation; phase behaviour; pressure-volume-temperature; PVT; compositional gradient; condensate banking; liquefied petroleum gas; LPG; modelling; well deliverability; primary depletion; gas injection.

DOI: 10.1504/IJOGCT.2011.037746

International Journal of Oil, Gas and Coal Technology, 2011 Vol.4 No.1, pp.79 - 102

Published online: 26 Dec 2010 *

Full-text access for editors Access for subscribers Purchase this article Comment on this article