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On the appraisal and development of ST-X field: uncertainties and challenges

Hung Viet Vu 1, *
Lan Cao Mai 2
  1. Lam Son Joint Operating Company
  2. University of Technology, VNU-HCM Adjunct Senior Lecturer, University of Southern Queensland, Australia
Correspondence to: Hung Viet Vu, Lam Son Joint Operating Company. Email: pvphuc@vnuhcm.edu.vn.
Volume & Issue: Vol. 17 No. 3 (2014) | Page No.: 110-116 | DOI: 10.32508/stdj.v17i3.1488
Published: 2014-09-30

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Copyright The Author(s) 2023. This article is published with open access by Vietnam National University, Ho Chi Minh city, Vietnam. This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0) which permits any use, distribution, and reproduction in any medium, provided the original author(s) and the source are credited. 

Abstract

This paper summarizes theuncertainties and challenges in appraising and developing the ST-X gas condensate field, which is offshore Vietnam in Block 15-1. Drill Stem Test (DST) results show that the ST-X field has moderate to low permeability, multiple flow boundaries/barriers, and at least 2 PVT regions. To understand the impact of these and other important reservoir parameters on ultimate gas and condensate recovery and well count, a reservoir simulation study was performed. The study demonstrates that there is a wide range of possible ultimate gas and condensate recoveries and well counts. The top causes for this wide range are the heterogeneity in permeability distribution and flow boundaries/barriers. In addition to the subsurface risks, drilling cost of a ST-X well is very high. The high well cost in combination with the field being offshore, having low permeability and possibly numerous reservoir compartments dramatically increase the risk of a full field development.

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