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51313-02631-Selection of Scale Inhibitor for Geothermal Applications

Picture for Selection of Scale Inhibitor for Geothermal Applications
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Product Number: 51313-02631-SG
ISBN: 02631 2013 CP
Author: Hua Guan
Publication Date: 2013
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Siliceous scaling deposition from geothermal brine are recognised as detrimental to the smooth operation of steam generation and injection facilities the control of such deposition is costy and less well understood. Scales normally encountered in geothermal well are often different from the conventional cases. Silica (amorphous and colloidal) and poor crystallised metal silicates are the most common scale types in geothermal applications.
There are a number of ways to control this types of scaling including both engineering (e.g. maintain pressure and temperature) and chemical means (e.g. controlled precipitation and inhibition). This paper will focus on preventative techniques by the use of chemical inhibitors.
However currently there are no standard or generally accepted laboratory test methods to study this type of fouling problems. Using a low pressure test method and testing apparatus we are able to rank the scaling inhibition performance of several generic chemicals; furthermore the chemical was successfully packaged into formulations that suitable to a specific geothermal well condition where large amount of iron were present complicated with the co-deposition of barium sulphate scale. Moreover the mechanisms of silica/metal silicate scale formation and inhibition including the verification test using a HPHT apparatus and actual field trial result for this geothermal application are discussed in this paper.
 

Siliceous scaling deposition from geothermal brine are recognised as detrimental to the smooth operation of steam generation and injection facilities the control of such deposition is costy and less well understood. Scales normally encountered in geothermal well are often different from the conventional cases. Silica (amorphous and colloidal) and poor crystallised metal silicates are the most common scale types in geothermal applications.
There are a number of ways to control this types of scaling including both engineering (e.g. maintain pressure and temperature) and chemical means (e.g. controlled precipitation and inhibition). This paper will focus on preventative techniques by the use of chemical inhibitors.
However currently there are no standard or generally accepted laboratory test methods to study this type of fouling problems. Using a low pressure test method and testing apparatus we are able to rank the scaling inhibition performance of several generic chemicals; furthermore the chemical was successfully packaged into formulations that suitable to a specific geothermal well condition where large amount of iron were present complicated with the co-deposition of barium sulphate scale. Moreover the mechanisms of silica/metal silicate scale formation and inhibition including the verification test using a HPHT apparatus and actual field trial result for this geothermal application are discussed in this paper.
 

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