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98287 The Effect of Desulphated Seawater Injection on Microbiological Hydrogen Sulphide Generation and Implication for Corrosion Control.

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Product Number: 51300-98287-SG
ISBN: 98287 1998 CP
Author: Tony Y. Rizk, James F.D. Stott, Robert D. Eden, Roy A. Davis, John E. McElhiney, Clara Di Iorio, Jo
Industry: Oil and Gas Production
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The effect of desulphated seawater on the biological generation of hydrogen sulphide in petroleum reservoirs has been investigated using a high-pressure, high-temperature, once-through bioreactor. The study demonstrated that a decreased sulphate concentration in injected seawater significantly restricted the activity of the sulphate-reducing bacteria (SRB) and the mass of produced hydrogen sulphide decreased as a direct function of the mass of available sulphate. Under sulphate limitation, the extent of reservoir souring and its time to onset may thus be retarded. The susceptibility of ferrous production materials to the most severe types of hydrogen sulphide damage is a complex issue which is dependent upon interrelated factors, including the hydrogen sulphide concentration in the gas phase, metallurgical composition and structure, temperature and stress. Nevertheless, for a substantial number of production systems, the introduction of desulphated seawater as the secondary recovery medium is predicted to eliminate ‘sour service’ conditions, as defined by the relevant industry standard, permitting the use of more cost effective ‘sweet service’ steels. Keywords: Sulphate-Reducing Bacteria (SRB), mesophilic, thermophilic, reverse osmosis, desulphated seawater
The effect of desulphated seawater on the biological generation of hydrogen sulphide in petroleum reservoirs has been investigated using a high-pressure, high-temperature, once-through bioreactor. The study demonstrated that a decreased sulphate concentration in injected seawater significantly restricted the activity of the sulphate-reducing bacteria (SRB) and the mass of produced hydrogen sulphide decreased as a direct function of the mass of available sulphate. Under sulphate limitation, the extent of reservoir souring and its time to onset may thus be retarded. The susceptibility of ferrous production materials to the most severe types of hydrogen sulphide damage is a complex issue which is dependent upon interrelated factors, including the hydrogen sulphide concentration in the gas phase, metallurgical composition and structure, temperature and stress. Nevertheless, for a substantial number of production systems, the introduction of desulphated seawater as the secondary recovery medium is predicted to eliminate ‘sour service’ conditions, as defined by the relevant industry standard, permitting the use of more cost effective ‘sweet service’ steels. Keywords: Sulphate-Reducing Bacteria (SRB), mesophilic, thermophilic, reverse osmosis, desulphated seawater
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