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Development of a Novel Phosphonate Scale Inhibitor for Scale Control in Ultra High Temperature Environments

As the oil industry continues to operate in more complex and ultrahigh temperature environments scale control becomes an ever increasing challenge. Scale inhibitors are being pushed to their operational limits and start to lose their efficiency against both calcium carbonate and calcium sulphate scales at >200°C. It is therefore essential to develop the next generation scale inhibitor to work effectively in harsh high temperature environments such as steam floods and geothermal wells.In this study details will be provided of the thermal stability of a novel biodegradable phosphonate scale inhibitor at temperatures up to 250°C. In addition examples of calcium sulphate and calcium carbonate scale control will be provided at 200°C and 250°C respectively where the inhibition performance of the novel phosphonate has provided significant improvements compared to other phosphonates and polymeric scale inhibitors known to be stable at high temperature.The work for calcium sulphate has focussed on steam flood applications where downhole temperatures reach ~200°C and the scale inhibition performance was tested using dynamic scale loop tests based upon a known industry standard procedure. Calcium carbonate inhibition was also tested at 200°C using a similar procedure and in addition with a geothermal brine at 250°C.  The new phosphonate scale inhibitor has also been designed to be biodegradable and can be deployed by both continuous injection and scale squeeze treatment. Careful consideration was also given in the molecular design process for high calcium tolerance and details of brine compatibility at high temperature will be provided.This paper presents details of the development of a biodegradable thermally stable and calcium tolerant phosphonate scale inhibitor for both calcium sulphate and calcium carbonate scale control in ultrahigh temperature environments at ≥200°C. In addition the environmental test data will be discussed along with a field example of deployment of the new phosphonate scale inhibitor for calcium carbonate scale control in a high calcium brine (30000mg/l) in West Africa.

Product Number: 51319-13182-SG
Author: Haiping Lu
Publication Date: 2019
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$20.00
$20.00
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09278 Scale Inhibitor Selection for Deepwater High Temperature Applications

Product Number: 51300-09278-SG
ISBN: 09278 2009 CP
Author: Suyun Wang and Jonathan Wylde
Publication Date: 2009
$20.00