A low cost, low volume, continuous inhibitor injection technique for gas producing conduits was developed, and qualified through field studies for superficial gas velocities up to 40 ft/sec (12 m/s); maximum steady state corrosion rates down-hole are below 0.2 mpy (0.005 mm/y) and on the surface below 3 mpy (0.075 mm/y).

The results of the new technique collected from 7 wells over several years are compared with the effectiveness of the so-called partial batch treatment, practiced on 12 wells of similar nature. The new technique results in corrosion rates which are from 2 to 6 times lower. It was shown that the effectiveness of batch treatments depends on the inhibitor solution being partially squeezed into the formation, and the amount of total liquid fluids available down-hole to move the inhibitor back out during normal production. The new technique is not only more effective than batch treatments, but less costly, and contributes to casing corrosion protection at temperatures up to 400°F. No formation damage has ever been observed due to inhibitor usage, either continuous or batch wise, however, inhibitors have to be carefully qualified for such applications.

Subject
Costs, Water, Inhibitor performance, Corrosion rate, Inhibitor films, Gas pressure, Liquids, Flow regime, Tubing, Chemical inhibition, Fluids, Inhibitor treatment, Corrosion inhibitors
© 1986 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).
1986
Association for Materials Protection and Performance (AMPP)
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