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Corrosion inhibition of oil-well steel (N-80) in simulated hydrogen sulphide environment by ferrous gluconate and synthetic magnetite

M.K. Amosa orcid.org/0000-0001-6246-6963 ; Department of Chemical Engineering, Ahmadu Bello University, Zaria, Nigeria.
I.A. Mohammed ; Department of Chemical Engineering, Ahmadu Bello University, Zaria, Nigeria.
S.A. Yaro ; Department of Metallurgical and Materials Engineering, Ahmadu Bello University, Zaria, Nigeria.
A.O. Arinkoola ; Department of Chemical Engineering, Ladoke Akintola University of Technology, Ogbomoso, Nigeria.
O.O. Ogunleye ; Department of Chemical Engineering, Ladoke Akintola University of Technology, Ogbomoso, Nigeria.

Sažetak

Selected environmentally benign iron compounds (synthetic magnetite and ferrous gluconate) have been evaluated as corrosion inhibitors for oil-well steel (N-80) in 50 mg/l sulphide concentration at various pH ranging from 5.5 to 11.5 and at High Temperature, High Pressure (HTHP) conditions by the weight loss method. The test temperatures were 150 °F, 275 °F and 350 °F respectively for pressures of 3 000 psi, 5 000 psi and 6 000 psi. The ferrous complex was found to be a better corrosion inhibitor compared to the synthetic magnetite. It exhibited up to 99.2% inhibition efficiency (IE) when the dose of the scavenger was doubled (i.e. when the sulphide to scavenger ratio was 1:2) irrespective of other factors such as pH, temperature and pressure. Whereas, the synthetic magnetite’s optimum inhibition efficiency (IE) was observed to be up to 75.1% only when the ratio of the sulphide to scavenger was 1:4 at the lowest pH of the experiment (pH 5.5) which is not desirable for a drilling mud. As the pH increases, the inhibition efficiency of the magnetite decreases and found to be lowest at the alkaline pH of 11.5.

Ključne riječi

corrosion inhibition; drilling fluid; environmental-benign; ferrous gluconate; oil-well steel, sulphides; synthetic magnetite

Hrčak ID:

53918

URI

https://hrcak.srce.hr/53918

Datum izdavanja:

31.5.2010.

Podaci na drugim jezicima: hrvatski

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