Application of gas-assisted gravity drainage (GAGD) to improve oil recovery of Rang Dong basement reservoir

  • Nguyen Kien Trung Japan Vietnam Petroleum Co., Ltd. (JVPC)
  • Ha Minh Dung Japan Vietnam Petroleum Co., Ltd. (JVPC)
Keywords: Fractured basement, production, IOR, EOR, GAGD, pilot test, Rang Dong field


As an option to improve the ultimate oil recovery factor of the Rang Dong field, a feasibility study of gas-assisted gravity drainage (GAGD) application was carried out for the fractured basement reservoir with a single-well Huff ‘n’ Puff pilot test applied on a high water-cut producer. This paper aims to provide an in-depth understanding about such case study, which includes details on candidate selection, gas injection scheme, on-site execution, results of flow-back, post-job review and lessons learned.

The pilot test of GAGD was recorded with a good oil rate and low water-cut during flowing back after gas injection and shut-in for gas segregation, which suggests the positive effectiveness of GAGD to some degree. The expansion of the GAGD application to other wells and areas in the field would be encouraged in any similar situation. On the other hand, the results of this pilot test shed a light into further optimisation of the candidate selection and gas injection scheme by material balance analysis and reservoir simulation respectively.


JVPC, “Investigation of gas assisted gravity drainage applicability for basement reservoir - Pilot test proposal”, 12/2013.

JVPC, “Gas assisted gravity drainage - Pilot test result”, 12/2014.

R. Valdez, S.P. Pennell, A. Cheng, T. Farley, and P.A. Boring, “Miscible hydrocarbon GOGD pilot in the Yates field unit”, SPE Improved Oil Recovery Conference, Tulsa, Oklahoma, USA, 14 - 18 April 2018. DOI: 10.2118/190248-MS.

M.M. Kulkarni and D.N. Rao, “Characterization of operative mechanisms in gravity drainage field projects through dimensional analysis”, SPE Annual Technical Conference and Exhibition, San Antonio, Texas, USA, 24 - 27 September 2006. DOI: 10.2118/103230-MS.

B. Lepski, Z. Bassiouni, and J.M. Wolcott, “Screening of oil reservoir for gravity assisted gas injection”, SPE/DOE Improved Oil Recovery Symposium, Tulsa, Oklahoma, USA, 19 - 22 April 1998. DOI: 10.2118/39659-MS.

H.K. Dinh, N.V. Le, M.G. Peter, V.T. Nguyen, T.S. Dang, V.Q. Nguyen, N.D. Hoang, T.A. Truong, H.M. Tran, and K.B. Nguyen, “Gas-assisted gravity drainage GAGD Huff n puff application for fractured basement reservoir - Case study”, SPE/ATMI Asia Pacific Oil & Gas Conference and Exhibition, Jakarta, Indonesia, 17 - 19 October 2017. DOI: 10.2118/186210-MS.

A.M. Saidi and S. Sakthikumar, “Gas gravity drainage under secondary and tertiary conditions in fractured reservoir”, Middle East Oil Shows, Bahrain, 3 - 6 April 1993. DOI: 10.2118/25614-MS.

Watheq J. Al-Mudhafar, and Dandina N. Rao, “Optimization of gas assisted gravity drainage (GAGD) process in a heterogeneous sandstone reservoir: Field-scale study”, SPE Asia Pacific Enhanced Oil Recovery Conference, Kuala Lumpur, Malaysia, 11 - 13 August 2015. DOI: 10.2118/174579-MS.

How to Cite
Nguyen , K. T., & Ha , M. D. (2022). Application of gas-assisted gravity drainage (GAGD) to improve oil recovery of Rang Dong basement reservoir . Petrovietnam Journal, 10, 35 - 45.