Further work has been undertaken on the continued to develop a novel chemistry to dissolve iron scale deposits. Laboratory tests showed promising results when applied to actual field deposits with very high dissolution and low corrosion rates. The novel dissolver blend is based upon Tetrakishydroxymethylphosphonium sulphate (THPS), yet little is understood about this chemistry and the synergies it displays. Laboratory studies have been performed investigating the various synergies, the effect of pH, concentration of components and the use of alternative chemistries to THPS.

Many types of iron scale are targeted by this new chemistry, including various polymorphs of iron sulphide scale (e.g. pyrite, Mackinawite), iron oxy-hydroxide scale (geothite) and iron carbonate (siderite) scale.

Field trials and/or use of the new chemistry have been successful in removing iron sulphide scale from oil field water injection systems. One trial resulted in extended performance of acid stimulations of injection wells and improved maintenance of the waterflood. Similar applications of the chemistry are also being carried out as a result of this successful trial.

Subject
Salts, Iron sulfides, Additives, Iron, Dissolution, Siderite, Minerals, Acidity, Dissolvers, Iron carbonate scale, Scale formation, Scale, THPS
Keywords:
Iron sulphide, iron carbonate, scale, dissolver, THPS
© 2004 Association for Materials Protection and Performance (AMPP). All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means (electronic, mechanical, photocopying, recording, or otherwise) without the prior written permission of AMPP. Positions and opinions advanced in this work are those of the author(s) and not necessarily those of AMPP. Responsibility for the content of the work lies solely with the author(s).
2004
Association for Materials Protection and Performance (AMPP)
You do not currently have access to this content.