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Title:	Constrained optimization towards capital expenditure (CAPEX) free oil production maximization for integrated sub-surface and surface operation
Authors:	Shahrul Azman Zainal Abidin (P89033)
Supervisor:	Wan Ramli Wan Daud, Prof. Dato' Ir. Dr.
Keywords:	Universiti Kebangsaan Malaysia -- Dissertations Dissertations, Academic -- Malaysia
Issue Date:	6-Apr-2020
Description:	An interactive integrated surface subsurface model was successfully developed to produce Capital Expenditure (CAPEX) free oil production optimization envelope for an arbitrary Field A. By having this optimization envelope, operation teams always have optimized each header surface pressure and sub-surface individual well choke valve opening set points to be applied at any possible well lineup configurations. Having the integrated optimization model under single simulation and thermodynamic platform make the optimization calculation more robust, stable and faster to reach optimum solution. The developed integrated optimization envelope covers all possible well lineup configurations range for Field A make it ready to be used by operation team as compared to typical approach of single optimization point or well lineup that make it difficult to implement. With the application of constrained optimization to maximize oil production, the optimization setup is designed to locate the CAPEX free optimization point where the set points of individual header pressure and individual choke valve opening can readily be used to realize the additional production. Well Inflow Performance Relationship (IPR) data was regressed and correlated for liquid flow as a function of Tubing Head Pressure (THP), water cut, gas to oil ratio (GOR) and gas lift flow. To complete the surface and sub-surface integrated model, the individual well flow correlation was linked with PETRONAS steady state process simulation software iCON. The integrated model was benchmarked and matched with 5 wide range of operating conditions and productions proved that the model is suitable for optimization studies. Three different optimization techniques were used to countercheck the constrained optimization solution was accurately located and verified with actual model and operation data. Finally integrated optimization envelope was developed for Field A and the findings were verified using dynamic simulation model to confirm controllability during transient and the facility can accommodate additional oil, gas and water production. The highest optimized production flow is 5982 bbl/day when all wells are flowing from all headers with production flow gained of 313 bbl/day equivalent to 5.52 % production increase. The highest flow gained of 981 bbl/day equivalent to 26.8 % with optimized production of 4642 bbl/day when medium pressure well is not flowing. This is due to no back pressure coming from medium wells to both high and low pressure wells. The constrained optimization was performed in locating the CAPEX free optimization point at different well lineup configurations. The methodology established in this thesis can be repeated in other fields to realize additional production without the need of CAPEX.,Ph.D.
Pages:	159
Publisher:	UKM, Bangi
Appears in Collections:	Faculty of Engineering and Built Environment / Fakulti Kejuruteraan dan Alam Bina

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