Gas Lift Optimization for a Sudanese Field

Elsharif Hassan Hassan, Mohanned Khairy Khairy

Abstract


Gas lift is mainly used to decrease bottom hole flowing pressure resulting from fluid hydrostatic pressure and rapid decrement in reservoir pressure. Available gas amount and compressors capacity are the main limitations to this method, thus optimization in each well is the key for the highest recovery. In this study the problem of allocating limited gas to wells network was addressed, the under-study field suffers from production deferment due to gas injection instability which is 40% of the total field production. A commercial multiphase simulator was used to model the field wells and coupled with the nonlinear weighted incremental gradient equations and simulated several scenarios for gas injection limitation for the total network. the multiphase flow correlations were considered, Begs and Brill was found to be the most accurate correlation for this field. The optimization resulted in several changes in the lift gas for each well; total injection rate incrimination was not affecting the overall oil production rate. Optimum gas injection rate is 7 MMscf\D which is 1 MMscf\D less than the current situation and the oil rate is 8% increased. Some wells cannot benefit from the optimization due to their high water cut and low reservoir pressure. Finally, the economic analysis showed that the 7 MMscf\D optimized injection rate is suitable for this field with 12% income in a daily rate.

Keywords


Production optimization, Injection rate allocation, Network Modeling, Key field

Full Text:

Untitled

References


Takacs and Gabor (2005). Gas Lift Manual. PennWell Corporation.

Nishikiori, N., Redner, R.A., Doty, D.R., and Schmidt, Z (1989). An improved Method for Gas Lift Allocation Optimization. SPE 19711, presented at the 64th Annual Technical Conference and Exhibition of SPE held in San Antonio, TX, 8-11 October 1989.

R. W. Pittman (1982). Gas Lift Design and Performance. International Petroleum Exhibition and Technical Symposium, 17-24 March 1982, Beijing, China. Society of Petroleum Engineers.

Okoro, E.S. and Ossia, C. V. (2015). Production Optimization in the Niger Delta Basin by Continuous Gas Lift. International Journal of Scientific and Engineering Research.

R. Recham, D. Bencherif, (2004). Production Optimization of Hassi R'mel Oil Rim Using Gas-Lift Approach. Canadian International Petroleum Conference, June 1 - 8, 2004, Calgary, Alberta. Society of Petroleum Engineers.

Omar.F. Al-Fatlawi, M. Al-Jawad, K. A. Alwan, A. A. Essa, Dhifaf J. Sadeq and A. J. Mousa

SUST Journal of Engineering and Computer Sciences (JECS), Vol. 02, No. 3, 2019

(2015). Feasibility of Gas Lift to Increase Oil Production in an Iraqi Giant Oil Field. SPE North Africa Technical Conference, September 14-16, 2015, Cairo, EGYPT.

Ifeanyi, U. C., Esieboma, S., & Uche, J. (2019). Gas Lift Optimization within Field Capacity Limitations. SPE Nigeria Annual International Conference and Exhibition, 5-7 August, Lagos, Nigeria.SPE-198744-MS

J.H. Espanol, C.S. Holmes, K.E. Brown (1969). A Comparison of Existing Multiphase Flow Methods for the Calculation of Pressure Drop in Vertical Wells. SPE-2553-MS Fall Meeting of the Society of Petroleum Engineers of AIME, 28 September-1 October, Denver, Colorado.

Santana, R. & Martins Ferreira Filho, Virgilio Jose & Monteiro, D. & Chaves, Gabriela & Duque, M. & Saavedra, A. & Baioco, Juliana & Teixeira, A. & Vieira, B. (2017). Gas Lift Optimization Under Uncertainties in BSW. SPE-185541-MS. Latin American and Caribbean Petroleum Engineering Conference.

Wang, P., and Litvak, M.L(2004). Gas Lift Optimization for Long-Term Reservoir Simulation. SPE 90506, presented at the SPE Annual Technical Conference and Exhibition held in Houston, Texas, 26-29 September 2004.

Qin Lu and Graham C. Fleming (2011). Gas-Lift Optimization Using Proxy Functions in Reservoir Simulation, SPE 140935, SPE Reservoir Simulation Symposium held in The Woodlands, Texas, USA.

Khamehchi, E., Rashidi, F., Karimi, B., Pourafshary, P., and Amiry, M. (2009). Continuous gas lift optimization using genetic algorithm. Australian Journal of Basic and Applied Sciences, 3(4), 3919-3929.

Anuar, W. M. A. W. K., Badawy, K., Bakar, K. A. A., Aznam, M. R. M., Salahuddin, S. N. K., Mail, M., Tri, N. V. (2018). Integrated Operations for Gas Lift Optimization: A Successful Story at Peninsular Malaysia Field. Society of Petroleum Engineers. SPE-191994-MS

Bezerra, M. D. F., Vigano, G. C., & Giuriatto, J. L. (2019). Optimization Methodology of Artificial Lift Rates for Brazilian Offshore Field. Offshore Technology Conference. SPE-29889-MS.

H.K. Lee, J. Liang, J.C. Ader and R.B. Legget, (1993) .Computer Design and field wide Optimization for gas lifted wells. Society of Petroleum Engineers, Inc. SPE-25625-MS Middle East Oil Show, 3-6 April, Bahrain