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Case Study: Foaming During Startup of Karan Nonassociated Gas

All amines are subject to foaming in industrial applications given certain conditions and circumstances. Methyl diethanolamine (MDEA) is like other types of amine that can experience major foaming upset, especially in high-pressure sweetening units. However, MDEA is one of the most popular solvents for gas treating, with several advantages over other amines, particularly its ability to remove hydrogen sulfide (H2S) and slip carbon dioxide (CO2) from sour gas. This paper describes Saudi Aramco’s efforts to eliminate early foaming incidents during the commissioning stage of the Karan nonassociated (NA) sour-gas field.

Introduction

The Karan field was discovered by Saudi Aramco in 2006. This newly developed offshore field is located 120 km northwest of Jubail Industrial City in eastern Saudi Arabia. Produced sour gas is coblended at a tie-in offshore platform through five 20‑in. subsea flowlines. From the tie-in offshore platform, the gas is sent through a 38-in. subsea pipeline to the onshore gas-treatment facilities at the Khursaniyah Gas Plant. Karan facilities consist of three gas-treatment-processing trains, each designed to process 620 MMscf/D of NA sour gas, producing sales gas and acid gas.

Karan NA sour gas is a CO2-rich stream. Formulated MDEA was selected for sweetening in Karan gas-treating facilities to enhance the H2S/CO2 ratio in acid gas and to meet the required sales-gas specification before sending the gas to the Saudi Master Gas System.

This article, written by JPT Technology Editor Chris Carpenter, contains highlights of paper IPTC 17175, “Khursaniyah Gas-Plant Experience With Foaming During Startup of Karan Nonassociated Gas,” by Mohammed Hussain Al-Qahtani, Saudi Aramco, and Paul Garland, INEOS, prepared for the 2013 International Petroleum Technology Conference, Beijing, 26–28 March. The paper has not been peer reviewed. Copyright 2013 International Petroleum Technology Conference. Reproduced by permission.
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Case Study: Foaming During Startup of Karan Nonassociated Gas

01 April 2014

Volume: 66 | Issue: 4

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