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Development of a Novel Phosphonate Scale Inhibitor for Scale Control in Geothermal Applications

Geothermal brines typically contain dissolved minerals and gases that can cause calcium carbonate silica/silicate and iron sulphide scale deposition in wells and on topside equipment. The presence of scale within a geothermal system can cause various issues that can lead to decreased efficiency of thermal energy production.The high temperatures of geothermal wells can create quite a challenge for scale control in terms of inhibition performance and thermal stability and this limits the chemistry of scale inhibitors that can be applied under these conditions. For calcium carbonate scale control phosphonates often display better inhibition capability than polymers as well as increased brine tolerance.However the thermal stability limits for low molecular weight phosphonates which typically provide good calcium carbonate inhibition are limited to 170°C- 200°C and this temperature can often be too low for geothermal wells. There is therefore a need to develop a novel phosphonate chemistry with a higher temperature stability up to 250°C for geothermal application.The thermal aging data at 250°C for the novel phosphonate chemistry will be presented and furthermore for calcium carbonate details will be provided of scale inhibition performance testing in geothermal brines compared with other traditional phosphonates and polymeric scale inhibitors at 250°C. The calcium carbonate inhibition performance was determined using dynamic scale loop (DSL) tests using a standard industry technique adapted for high temperature geothermal conditions.This study presents details of the development of novel phosphonate scale inhibitor that has been designed to work against calcium carbonate scales at temperatures up to 250°C. The new product is biodegradable calcium tolerant and has the capability to be deployed by continuous injection or in downhole scale squeeze treatments if necessary.

Product Number: 51319-13275-SG
Author: Bethanni McCabe
Publication Date: 2019
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$20.00
$20.00
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