A previous paper reported that a novel phosphonium biocide (based on tetrakishydroxymethylphosphonium sulphate), dosed to injection water, travelled through the formation and re-emerged in the produced water. It was suggested, at the time, that the biocide might be helping to control produced hydrogen sulphide levels by its effect on downhole sulphate reducing bacteria. This paper reports new findings which confirm that the re-emergent biocide is biocidally active. Data is also presented showing that when biocide dosing is suspended, produced hydrogen sulphide levels increase and when dosing is restored the produced hydrogen sulphide levels return to their previous values. These findings help strengthen the suggestion that biogenic hydrogen sulphide may be controlled, downhole, with the new biocide.

Subject
Hydrogen sulfide, Water, Materials, Correlation, Sulfates, Fluids, Bacteria, Produced water, Sulfides, THPS, Biocides, Risk reduction, Samples
Keywords:
hydrogen sulphide, oil production, biocide, souring, tetrakishydroxymethylphosphonium sulphate, trishydroxymethyl phosphine oxide, sulphate reducing bacteria
© 1995 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).
1995
Association for Materials Protection and Performance (AMPP)
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