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OS3C-4：A NEW APPROACH TO EVALUATE KHI PERFORMANCE
发布时间:2014-07-28
Megat A RITHAUDDEEN1, Shadi AL-ADEL1, Ross ANDERSON2, Bahman TOHIDI2
1.Saudi Aramco, Dhahran, Kingdom of Saudi Arabia; 2.Hydrafact Ltd & Heriot-Watt University, Scotland, United Kingdom
The Karan field is Saudi Aramco’s first offshore nonassociated gas, which started production in mid-2011. The gas is sour (2% H2S and 8% CO2) and lean with no hydrocarbon condensate. The gas is predicted to produce 2 bbl/mmscf of condensed water with 750 ppm of organic acids. Condensation of water creates a high risk for both corrosion and gas hydrates during winter.
As such, there is a great challenge to find a suitable and compatible kinetic hydrate inhibitor (KHI) in the presence of a corrosion inhibitor (CI) for a predominantly hydrate structure I system. Saudi Aramco approached Heriot-Watt University and Hydrafact Ltd, which offers a new proprietary technique for evaluating KHI performance and has gained considerable knowledge on the mechanisms involving KHI inhibition.
This paper describes the work that has been done to independently evaluate KHI performance for the Karan field. The work involves evaluation of various mixtures of KHI and CI at different concentrations for the Karan system using in-house crystal growth inhibition and traditional induction time methods with test protocols for the latter specified by Saudi Aramco. In addition, the effect of corrosion inhibitor on KHI performance was also analyzed. The performance of two different KHIs was also compared. The work done has increased Saudi Aramco confidence and understanding with regard to hydration inhibition using KHI.
1.Saudi Aramco, Dhahran, Kingdom of Saudi Arabia; 2.Hydrafact Ltd & Heriot-Watt University, Scotland, United Kingdom
The Karan field is Saudi Aramco’s first offshore nonassociated gas, which started production in mid-2011. The gas is sour (2% H2S and 8% CO2) and lean with no hydrocarbon condensate. The gas is predicted to produce 2 bbl/mmscf of condensed water with 750 ppm of organic acids. Condensation of water creates a high risk for both corrosion and gas hydrates during winter.
As such, there is a great challenge to find a suitable and compatible kinetic hydrate inhibitor (KHI) in the presence of a corrosion inhibitor (CI) for a predominantly hydrate structure I system. Saudi Aramco approached Heriot-Watt University and Hydrafact Ltd, which offers a new proprietary technique for evaluating KHI performance and has gained considerable knowledge on the mechanisms involving KHI inhibition.
This paper describes the work that has been done to independently evaluate KHI performance for the Karan field. The work involves evaluation of various mixtures of KHI and CI at different concentrations for the Karan system using in-house crystal growth inhibition and traditional induction time methods with test protocols for the latter specified by Saudi Aramco. In addition, the effect of corrosion inhibitor on KHI performance was also analyzed. The performance of two different KHIs was also compared. The work done has increased Saudi Aramco confidence and understanding with regard to hydration inhibition using KHI.
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