Volume 4, Issue 3, June 2019, Page: 52-58
Simulation of Laboratory Hydrate Loop Using Aspen Hysys
Odutola Toyin Olabisi, Department of Petroleum and Gas Engineering, University of Port Harcourt, Rivers State, Nigeria
Ugwu Chukwuemeka Emmanuel, Department of Chemical Engineering, University of Port Harcourt, Rivers State, Nigeria
Received: Apr. 12, 2019;       Accepted: Jun. 23, 2019;       Published: Jul. 4, 2019
DOI: 10.11648/j.eas.20190403.11      View  29      Downloads  10
Gas hydrates have repeatedly plagued the oil and gas industry by impeding flow and causing catastrophic damages to subsea pipelines and equipment. Several software as well as equipment have been developed to reduce hydrate plugs in the field. In this study, steady state simulation and dynamic state simulation on a laboratory hydrate loop was carried out using Aspen Hysys. During the simulation, two mixers (Mixer 1 and Mixer 2) were selected to create the inhibitor water stream and the mixed feed stream respectively in the Process Flow Diagram (PFD). A pump was then selected to boost the pressure in the simulation to 150 psia and to agitate the fluid. Heat exchanger was selected to reduce the temperature to hydrate formation temperature, mimicking the action of the 4” PVC water bath in which the loop is immersed in the experimental set up. In the dynamic simulation, valves were included in the feed stream of the PFD created for the steady state simulation. The feed stream used in the simulation study contained 85% methane and 2wt% methanol as inhibitor. The steady state simulation did not record hydrate formation implying that the 2wt% Methanol used as inhibitor was sufficient to prevent hydrate formation in the loop. However, the dynamic state simulation which was set to run for 2 hours just as the experimental setup recorded hydrate formation at a temperature of 4.26 °C and a pressure of 83.84 psi. This can also imply that during shut in process, hydrate formation may not occur as the line may only attain hydrate formation temperature. However, during restart prrocess which is like the dynamkic simulation, a lot of aggitation takes place and hydrate formation will be noticed. Therefore, the engineer must proceed to dynamic state simulation before concluding on the effectiveness of a particular dosage of inhibitor prior to field application.
Gas Hydrate, Laboratory Hydrate Loop, Flow Assurance, Hydrate Inhibition, Hydrate Prediction
To cite this article
Odutola Toyin Olabisi, Ugwu Chukwuemeka Emmanuel, Simulation of Laboratory Hydrate Loop Using Aspen Hysys, Engineering and Applied Sciences. Vol. 4, No. 3, 2019, pp. 52-58. doi: 10.11648/j.eas.20190403.11
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This article is an open access article distributed under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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