Method for removing iron sulfide and calcium carbonate scale

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United States of America Patent

PATENT NO 11421143
SERIAL NO

16133153

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Abstract

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A method of removing a heterogeneous scale from a surface in fluid communication with a wellbore and/or subterranean formation comprising contacting the scale with a composition comprising tetrakis(hydroxmethyl)phosphonium sulfate (THPS) and N-(2-hydroxyethyl)ethylenediaminetriacetic acid (THEDTA) to dissolve the scale having a pH in the range of about 6.0 to 8.0. The composition is suitable to remove iron sulfide and calcium carbonate scale in the absence of corrosion resistance at a temperature up to about 150° C. Also, the composition may be used remove scale from surface pipe line and other petroleum oil handling equipment.

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Patent Owner(s)

  • KING FAHD UNIVERSITY OF PETROLEUM AND MINERALS

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Elkatatny, Salaheldin Dhahran, SA 23 16
Mahmoud, Mohamed Dhahran, SA 52 72

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