Barium sulphate scale is becoming a formidable problem in the oil and gas production from natural reservoirs. Once formed it clogs the oil pipelines, resulting in a large economic lOss. To understand the behaviour of this highly insoluble material a complete and comprehensive review is presented with a critical discussion on the solubility of barium sulphate in presence of different elect ro 1 yte sys terns. I t has been sugges ted tha t the increased solubility is mainly due to the side reactions of both barium and sulphate ions, where as the contribution from ionic strength is relatively small.
M I FAROOQI ,R MAHMOOD ,N BASHIR ,
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