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51313-02595-Selection of Corr. Inhibitors Under Oil/Water/Gas Flow Conditions in Deep Offshore Catenary Risers

Picture for Selection of Corr. Inhibitors Under Oil/Water/Gas Flow Conditions in Deep Offshore Catenary Risers
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Product Number: 51313-02595-SG
ISBN: 02595 2013 CP
Author: Cheolho Kang
Publication Date: 2013
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The multiphase flow characteristics can be changed with the change of pipeline topography in deep offshore oil and gas production. The increase of corrosion rate and decrease of inhibitor performance in the risers can be occurred due to the change of multiphase flow characteristics (e.g. severe slugging).

For the simulation of offshore flow lines and risers the experiments were carried out in a 44 m long three different pipeline inclinations of 0 3 and 45 degrees industrial scale multiphase flow loop.

In this paper the effectiveness of the three commercial corrosion inhibitors were outlined using 25 cP oil at 80% water cut and at three different gas velocities (0.7 m/s 3 m/s and 6 m/s). All tests were carried out at a liquid velocity of 1.5 m/s a system pressure of 6 bar (76 psig) using carbon dioxide gas as the gas phase and a temperature of 50°C.

Also the effect of inclination on the flow characteristics (e.g. flow pattern) and their subsequent effect on corrosion rates are described.

The results indicated that sever pitting corrosion was noticed in the 3 and 45° weight loss coupons for baseline testing. Severe slugging and high slug frequency were seen in 45 degree upward flowing conditions. The tests discriminated between different inhibitors. In most of testing conditions high inhibitor concentration was required to achieve the target corrosion rate.
 

The multiphase flow characteristics can be changed with the change of pipeline topography in deep offshore oil and gas production. The increase of corrosion rate and decrease of inhibitor performance in the risers can be occurred due to the change of multiphase flow characteristics (e.g. severe slugging).

For the simulation of offshore flow lines and risers the experiments were carried out in a 44 m long three different pipeline inclinations of 0 3 and 45 degrees industrial scale multiphase flow loop.

In this paper the effectiveness of the three commercial corrosion inhibitors were outlined using 25 cP oil at 80% water cut and at three different gas velocities (0.7 m/s 3 m/s and 6 m/s). All tests were carried out at a liquid velocity of 1.5 m/s a system pressure of 6 bar (76 psig) using carbon dioxide gas as the gas phase and a temperature of 50°C.

Also the effect of inclination on the flow characteristics (e.g. flow pattern) and their subsequent effect on corrosion rates are described.

The results indicated that sever pitting corrosion was noticed in the 3 and 45° weight loss coupons for baseline testing. Severe slugging and high slug frequency were seen in 45 degree upward flowing conditions. The tests discriminated between different inhibitors. In most of testing conditions high inhibitor concentration was required to achieve the target corrosion rate.
 

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