Safe Hydrate Plug Dissociation in Active Heating Flowlines and Risers - Full Scale Test
| Autor: | Ronald Bass, Douglas J. Turner, David Kaye, Thomas Parenteau, Julien Rolland, Julie E. P. Morgan, Christina Tzotzi, Erich Zakarian, Marie-Kathleen Decrin |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Petroleum engineering
Chemistry 02 engineering and technology 010502 geochemistry & geophysics 01 natural sciences Dissociation (chemistry) law.invention 020401 chemical engineering Chemical engineering law Full scale test 0204 chemical engineering Hydrate dissociation Hydrate Spark plug 0105 earth and related environmental sciences |
| Zdroj: | Day 4 Thu, May 05, 2016. |
| DOI: | 10.4043/27051-ms |
| Popis: | Electrically Traced Heated Pipe in Pipe (ETH-PiP) technology has been developed to overcome some of the challenges associated with deeper and more remote offshore oil and gas production. This active heating technology applies power to achieve a production fluid temperature above the wax or hydrate appearance temperature either continuously, during normal production, or intermittently, during shutdown periods. Concerning hydrate management, the contractor Company in collaboration with Major Operators conducting experimental and modelling studies to investigate hydrate dissociation in heated flowlines through a Joint Industry Project (JIP) kicked-off in 2012. The main objective of these investigations is to demonstrate that a long, non-permeable hydrate plug can be dissociated in a safe and controlled manner with the ETH-PiP technology. Large hydrate plugs (approximately 200 kg each) are formed in an 18m ETH-PiP 6? OD prototype, using a water and gas system equipped with DTS fiber optics systems for temperature monitoring, pressure and temperature sensors, and high accuracy gas flow meters. Different heating strategies are tested to investigate the best active heating procedure for safe hydrate plug dissociation, using temperature, pressure and released gas flow rate monitoring along the entire length of the prototype. Hydrate plug dissociations are performed in open or closed volumes for various conditions during the 2nd phase of the experimental campaign, which started at the end of 2013. High pressure differentials are applied across the hydrate plugs; non-uniform longitudinal heating profiles are applied to reproduce operating conditions similar to direct electrical heating; and three-phase dissociation experiments are conducted to simulate the influence of oil present in the hydrate pores on the plug dissociation. The paper gives an overview of the experimental set-up and measuring techniques used. It describes the hydrate plug formation, location, and characterization, as well as the successful dissociation of hydrate plugs. Preliminary simulation results based on a specifically developed "in-house" simulator are presented, as well as extrapolation of the results to real subsea conditions. This test program demonstrated that large non-permeable hydrate blockages in single line field architectures could be dissociated without local pressure build-up or plug run-away using ETH-PiP technology. |
| Databáze: | OpenAIRE |
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