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Economic Evaluation of Chemical Inhibitors for Hydrate Solution in Nigeria Oilfield Flowlines

Oil and gas companies across the world have expanded their operations to cold environments like the Offshore Deep-water for more conventional and economical reservoirs as a result of global demand for energy. As Hydrocarbon production continues to increase from both conventional and unconventional reservoirs in harsh environments, Hydrates presents a huge problem in the oil and gas industry because it leads to production losses, and is very expensive in trying to prevent its formation or removal. The hydrate blockage during Deepwater oil and gas exploration will also damage the equipment and threaten personal safety. It also leads to flow interruptions, environmental and safety problems, the interruptions leads to plugging of the flowline, Hydrates still cost the oil and gas industries millions of dollars annually. This paper discusses the existing chemical inhibitors used to mitigate hydrates as well as evaluating economically the cost implication for twelve years in Niger-Delta. In this study, three different types of chemical inhibitors (i.e. Methanol, Mono-ethylene glycol and KHI) were economically evaluated through a cash flow model and eventually the Net Present Value, Internal Rate of Return, Profitability Index, Present Value Ratio and Payback Period were determined and Monte Carlo Simulation was also used to get NPV, IRR and their uncertainties. Their charts show that KHI will generate an NPV of $20.34MM if invested in at Return of Investment of 28% and will also take a period of 3.76 years to recover the investment made into the project. From the analysis, KHI is a better project to invest in because it generates more profit and has a lesser risk than Methanol and Mono-ethylene glycol.

Offshore, Inhibitors Economics, Hydrate Problems, Chemical Inhibitors, Risks

APA Style

Precious Joseph Ekpo, Uche Osokogwu, Solomon Williams. (2022). Economic Evaluation of Chemical Inhibitors for Hydrate Solution in Nigeria Oilfield Flowlines. Engineering Science, 7(4), 54-62.

ACS Style

Precious Joseph Ekpo; Uche Osokogwu; Solomon Williams. Economic Evaluation of Chemical Inhibitors for Hydrate Solution in Nigeria Oilfield Flowlines. Eng. Sci. 2022, 7(4), 54-62. doi: 10.11648/

AMA Style

Precious Joseph Ekpo, Uche Osokogwu, Solomon Williams. Economic Evaluation of Chemical Inhibitors for Hydrate Solution in Nigeria Oilfield Flowlines. Eng Sci. 2022;7(4):54-62. doi: 10.11648/

Copyright © 2022 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License ( which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

1. Buzatoiu B., and Popp, V. V. (1999). ”Hydrate Problem in the Oil Production Industry”. SPE, PETROM SA - ICPT - Campina, I. R. Loas PETROM S. A. - SPP Targu Jiu ROMANIA,
2. Wang, Z., Zhao, Y., Zhang, J. et al (2020). “Natural Gas Hydrate Management in Deepwater Gas Well Chen G, Sun C, Qinglan M. A (2008) “Gas Hydrate Science and Technology. Chemical Industry Press.
3. Majid, A. A., Lee, W., Strivestava, V. et al. (2016). “The Study of Gas Hydrate Formation and Partial Transportability using a High Pressure Flowloop”. In Offshore Technology Conference.
4. Theyab, M. A. (2018). “Fluid Flow Assurance Issues: Literature Review”. SF J Petroleum 2:1.
5. Irmann-Jacobsen Tine Bauck (2013). “Flow Assurance – A System Perspective. MEK4450 FMC Subsea technologies”. [
6. CFI (2021). Excel Definition. The Ultimate Software Tool for Financial Analysis. Retrieved August 11, 2021, from
7. Kutlik, R. (1998). “Flow Assurance Instrumentation. Offshore Technology Conference”. Houston Texas.
8. McMullen, N. D. (2006). “Flow-Assurance Field Solutions (Keynote)”. Offshore Technology Conference. Houston, Texas, USA.
9. Kelland, M. A. (2009). “Production chemicals for the oil and gas industry”. Boca Raton, Fla.: CRC Press. XVII, 437 s.
10. Li, X. S., Liu, Y. J., Zeng, Z. Y. et al (2011). “Equilibrium hydrate formation conditions for the mixtures of methane + ionic liquids + water”. J Chem Eng Data 56: 119–123.
11. Tian, J. et al. (2011). “Low Dosage Hydrate Inhibitors (LDHI): Advances and Developments in Flow Assurance Technology for Offshore Oil and Gas Productions, in Offshore Technology Conference”. Offshore Technology Conference: Houston, Texas, USA.
12. Igboanusi U. P., A. C. O. (2011). “The Advancement from Thermodynamic Inhibitors to Kinetic Inhibitors and Anti-Agglomerants in Natural Gas Flow Assurance”. International Journal of Chemical and Environmental Engineering. 2 (2): p. 131-134.
13. Karisiddaiah, S. M (2003) Report: fourth International Conference on Gas Hydrates. Held at Yokohama, Japan, 19-23 May 2002.
14. Chen G, Sun C, Qinglan M. A (20080 Gas Hydrate science and Technology, chemical industry press.
15. Guan, H. (2010). “The Inhibition of Gas Hydrates and Synergy of the Inhibiting Molecules, in International Oil and Gas Conference and Exhibition in China”. Society of Petroleum Engineers: Beijing, China.
16. Villano, L. D (2009) “A Study of the Kinetic Hydrate Inhibitor Performance and Seawater Biodegradability of a Series of Poly (2-alkyl-2-oxazoline)” Energy & Fuels. 23 (7): p. 3665-3673.
17. Fu, B., et al. (2001). “Novel Low Dosage Hydrate Inhibitors for Deepwater Operations”. In SPE Annual Technical Conference and Exhibition. Society of Petroleum Engineers Inc.: New Orleans, Louisiana.
18. Frostman, L. M, Thieu, V., Crosby, D. L. and Downs, H. H. (2003). “Low-Dosage Hydrate Inhibitors (LDHIs): Reducing Costs in Existing Systems and Designing for the Future”. Paper SPE 80269 presented at SPE International Symposium on Oilfield Chemistry, Houston, 5-8 February.
19. ICIS (Independent Commodity Intelligent Services). Retrieved April, 2008, from
20. Methanex, Retrieved March, 2008 from,
21. Okereke, N., Edet, P., Afolabi, F., Baba, Y., Izuwa, N., Kanshio, S., Nwogu, N., Nwanwe, O., and Odo, J. (2020). “Techno-Economic Assessment of the Hydrates Mitigation Potential of LDHI and MEG in Deepwater Scenario”. Paper SPE-203665-MS presented at the Nigeria Annual International Conference and Exhibition originally scheduled to be held in Victoria Island, Lagos, Nigeria, 11 - 13 August 2020. Due to COVID-19 the physical event was not held. The official proceedings were published online on 11 August 2020.
22. Kannan, K., and Punase, A. (2009). “Low-Dosage, High Efficiency and Environment Friendly Inhibitors: A New Horizon in Gas Hydrates Mitigation in Production Systems”. Paper SPE 120905 presented at SPE International Symposium on Oilfield Chemistry held in the wood lands, Texas, USA, 20-22 April.
23. Palisade (2021). Monte Carlo Simulation. Retrieved August 8, 2021, from
24. Kelland, M. A. (2006). “History of the Development of Low Dosage Hydrate Inhibitors. Energy & Fuels”. 20 (3): p. 825-847.