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Laboratory investigation of the effect of carbonate contaminant on the rheological properties of drilling mud based on Bingham plastic flow model was carried out. The rheological properties investigated were yield point, plastic viscosity, initial gel strength and ten‐minute gel strength. Eight samples of the same mud were used in the investigation. Equipment used in studying the rheological properties was a direct‐indicating viscometer. The result of the investigation showed that carbonate contaminant in drilling mud adversely increases the yield point and gel strength. Marginal increase in the plastic viscosity of the mud was also observed. The mud flocculated as the amount of carbonate increased.

This article has been withdrawn as it was published elsewhere and accidentally duplicated. The original article can be seen here: 10.1108/13552519710177934. When citing the article, please cite: B.O. Onyekpe, L.P. Dania, (1997), “Flowline corrosion problems: a case study of Shell Petroleum Development Company, Nigeria”, Journal of Quality in Maintenance Engineering, Vol. 3 Iss: 3, pp. 152 - 162.

Due to the inherent environmental hazards posed to our ecological system by the problem of oil spillage in aquatic media, an analytical model of this situation was derived from first principles using cylindrical co‐ordinates to predict the concentration of oil sunk in water. A computer simulation of the occurrence was done using simulated data after an explicit difference numerical formulation of the analytical model was performed. The results were found to correspond with the experimental results of Villoria et al.

Describes flowline problems inherent in the land and swamp fields. Non‐destructive testing ‐ general visual inspection and ultrasonic thickness survey based on the nominal diameter sizes, age category and location of flowlines ‐ was carried out. The readings obtained were used to calculate the percentage weight loss of pipe per metre and deduce the flowline sections that need to be replaced to avoid rupture of the steel pipe or fitting in service, using residual life estimates. The reduction of the wall thickness of the pipes/ fittings is caused by a combination of corrosion initiated by physical deformation anomalies and the presence of corrosive media along the flowline tracks (inside and outside the pipes). Offers new measures to help the company mitigate the various flowline problems.