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98103 AN INHIBITION POLICY BASED ON LABORATORY AND FIELD EXPERIENCE

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Product Number: 51300-98103-SG
ISBN: 98103 1998 CP
Author: M.-R. Bonis, J.-L. Crolet
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Operational experience shows that inhibition can be successful under a very wide range of service conditions, provided that certain simple basic principles are respected. These principles represent the company’s inhibition policy, which must cover all the stages in the life of a field, from conceptual engineering studies through to the end of production. In particular, prior selection and qualification in the laboratory of both inhibitors and methods of treatment is considered essential before any implementation in the field. The selection procedure must be adapted to reproduce as closely as possible the range of potential service conditions in the case considered. Once this stage is completed, the key to successful inhibition is the quality of its practical implementation. The field operator must have the necessary personnel and equipment to correctly perform and monitor the treatments. It is particularly emphasized that inhibition failures are often the result of apparently minor changes in service conditions (e.g. flow velocities, fluid compositions, etc.). Particular attention must therefore be paid to such changes throughout the production phase. High temperatures, oil/water partitioning and the sensitivity to certain minor elements, especially traces of oxygen, are major factors determining a satisfactory performance of inhibition. In addition, production flow velocities must be kept within a “reasonable” range, neither too high nor too low, in order to ensure an efficient treatment. Keywords : inhibition, oil and gas production, flow effects, monitoring, inspection.
Operational experience shows that inhibition can be successful under a very wide range of service conditions, provided that certain simple basic principles are respected. These principles represent the company’s inhibition policy, which must cover all the stages in the life of a field, from conceptual engineering studies through to the end of production. In particular, prior selection and qualification in the laboratory of both inhibitors and methods of treatment is considered essential before any implementation in the field. The selection procedure must be adapted to reproduce as closely as possible the range of potential service conditions in the case considered. Once this stage is completed, the key to successful inhibition is the quality of its practical implementation. The field operator must have the necessary personnel and equipment to correctly perform and monitor the treatments. It is particularly emphasized that inhibition failures are often the result of apparently minor changes in service conditions (e.g. flow velocities, fluid compositions, etc.). Particular attention must therefore be paid to such changes throughout the production phase. High temperatures, oil/water partitioning and the sensitivity to certain minor elements, especially traces of oxygen, are major factors determining a satisfactory performance of inhibition. In addition, production flow velocities must be kept within a “reasonable” range, neither too high nor too low, in order to ensure an efficient treatment. Keywords : inhibition, oil and gas production, flow effects, monitoring, inspection.
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