Hydrate Blockage Assessment in a Pilot-Scale Subsea Jumper

Asheesh Kumar, Mauricio Di Lorenzo, Karen Kozielski, Philippe Glénat, Eric F. May, Zachary M. Aman

Research output: Chapter in Book/Conference paperConference paper

1 Citation (Scopus)

Abstract

completethermodynamic hydrate inhibition at the pressure and temperature conditions used in this trial. Our unique flowloop facility offers new insight toward hydrate formation in complex subsea jumper-likegeometries. Our findings may assist operators in controlling the extent of hydrate formation and depositionin jumper geometries, by optimizing the MEG injection and subsequently supporting lower-CAPEX tiebackdevelopment concepts.,In subsea production operations, wellhead jumpers are one of the subsea facilities more liable to theformation of hydrate blockages during restart operations. To manage hydrate formation and optimizethe amount of thermodynamic hydrate inhibitors (e.g. mono-ethylene glycol; MEG) injected, a newly-constructed jumper-like facility (the HyJump flowloop) has been developed in Perth, to simulate shut-downand restart operations over a range of superficial gas velocities. The test section of the flowloop has a unique geometry to mimic subsea jumpers, with three low pointsand two high points standing 13′ 2″ tall. The test section is fitted with twelve pressure and temperaturesensors spread regularly, a MEG sensor, a valve to simulate the wellhead choke, and a viewing window. Ineach test, the jumper low points were loaded with aqueous solutions of MEG (0 to 30 wt%) and pressurizedwith domestic Perth natural gas at a pressure of 1200 psig and pipeline temperature ranging from 41°F to25.8°F (+5 to-4°C). The extent of hydrate restrictions or blockages was evaluated through the dynamic pressure drop behaviorobserved throughout the flowloop. A closer assessment of the pressure drop trace during gas restartsuggests that the severity of the hydrate restriction decreases as the MEG content is increased above 10wt%. Further, our preliminary experimental results illustrate that severe hydrate deposition in the jumpercould be completely avoided by injecting MEG at concentrations above 20 wt%. This corresponds to anapproximately 50% reduction in MEG content, where ≈38 wt% MEG dosage was required.

Original languageEnglish
Title of host publicationOffshore Technology Conference 2020, OTC 2020
PublisherOffshore Technology Conference
Number of pages8
ISBN (Electronic)9781613997079
Publication statusPublished - 2020
EventOffshore Technology Conference 2020 - Houston, United States
Duration: 4 May 20207 May 2020

Publication series

NameProceedings of the Annual Offshore Technology Conference
Volume2020-May
ISSN (Print)0160-3663

Conference

ConferenceOffshore Technology Conference 2020
Abbreviated titleOTC 2020
CountryUnited States
CityHouston
Period4/05/207/05/20

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  • Cite this

    Kumar, A., Lorenzo, M. D., Kozielski, K., Glénat, P., May, E. F., & Aman, Z. M. (2020). Hydrate Blockage Assessment in a Pilot-Scale Subsea Jumper. In Offshore Technology Conference 2020, OTC 2020 (Proceedings of the Annual Offshore Technology Conference; Vol. 2020-May). Offshore Technology Conference.