Advances in Chemical Engineering and Science, 2019, 9, 127-142 http://www.scirp.org/journal/aces ISSN Online: 2160-0406 ISSN Print: 2160-0392 Modeling and Simulation of Two-Staged Separation Process for an Onshore Early Production Facility Ojo Ademola, J. G. Akpa, K. K. Dagde Department of Chemical Engineering, Rivers State University, Port Harcourt, Nigeria Abstract Early Production Facilities are makeshift process deployment that ensures that marginal oilfield operators make revenues from their new discoveries with little cash outlay and limited investment risks. Authors have in past si- mulated a gas process facility using Hysys without particularly developing mathematical models for the key equipment. There also has been modeling of phase separation dynamics and process simulation but still without models for equipment. We basically developed models for the critical process equip- ment for early production, sized the equipment with data from a marginal field in the Niger delta region of Nigeria and then ran a dynamic simulation with the sized equipment. The important elements of the deployment are two-phase process vessel, 3-phase process vessel; knock-out drum, produced water treatment unit. Mathematical models were developed and adapted with Mathlab for the equipment sizing whilst ASPEN PLUS was used for simulating the process. Process data retrieved from a marginal field in Nigeria was used as input to quantify the equipment models. Sized equipment was deployed in Hysys V8.8 for a steady and dynamic state. The system simulation was com- prised of a two-phase process vessel followed by a 3-phase process vessel [1]. The unwanted gas was sent to knock out drum for removal of entrained liq- uid droplets before flaring (this was because the volume of gas processed is deemed uneconomical) and produced water to treatment unit for removing droplets of oil before disposal. Gas, oil and water were fed into the first stage separator (2-phase) at 132918.34 Ibmole/hr, 7622.95 Ibmole/hr and 1082.74 Ibmole/hr respectively. The operating pressures of the first and second vessels were at 850 psi and 150 psi respectively. The 2-phase vessel flashed off 96.7% of the gas and increased the liquid recovery by 3.3%. At the end of the second stage separation, oil yield increased by 270 Ibmole/hr, the gas increased by 110.15 Ibmole/hr whilst water reduced by 379 Ibmole/hr. This result con- How to cite this paper: Ademola, O., Akpa, J.G. and Dagde, K.K. (2019) Model- ing and Simulation of Two-Staged Separation Process for an Onshore Early Production Facility. Advances in Chemical Engineering and Science, 9, 127-142. https://doi.org/10.4236/aces.2019.92010 Received: January 7, 2019 Accepted: January 29, 2019 Published: February 1, 2019 Copyright © 2019 by author(s) and Scientific Research Publishing Inc. This work is licensed under the Creative Commons Attribution International License (CC BY 4.0). http://creativecommons.org/licenses/by/4.0/ Open Access DOI: 10.4236/aces.2019.92010 Feb. 1, 2019 127 Advances in Chemical Engineering and Science