This paper describes the development of a PMPA scale inhibitor chemistry, for potential ‘squeeze’ application, to provide scale inhibition under severe Barium Sulphate scaling conditions. Phosphonate type inhibitor chemistries have been applied in ‘squeeze’ treatments as they have the desired adsorption characteristics to protect the near wellbore formation, perforations and production strings for a significant period of time (known as the ‘Squeeze’ Life). These chemistry types, however, are not the most efficient means of preventing scale deposition in some severe, low pH BaSO4 scaling situations. Polymeric inhibitor species, in particular PolyVinylSulphonates (PVS) and sulphonated co-polymers (VS-Co), are sometimes more suited to these types of conditions, but they do not typically posses the necessary retention characteristics to achieve the desired ‘squeeze’ lifetimes. This paper discusses the development of a new experimental PMPA chemistry which has demonstrated improved inhibition performance under harsh BaSO4 conditions, whilst retaining the adsorption and retention characteristics of earlier PMPA chemistries and could potentially result in considerably longer ‘squeeze’ lifetimes than those currently achieved with the polymeric inhibitors.

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