Method for removing alkaline sulfate scale

Details Method for removing alkaline sulfate scale Method for removing alkaline sulfate scale

E - Fixed Constructions

21

B

E21B 37/00 (2006.01) B01D 11/00 (2006.01) B01F 1/00 (2006.01) B01F 11/02 (2006.01) B01J 19/10 (2006.01) B08B 3/12 (2006.01) B08B 7/00 (2006.01) C09K 8/528 (2006.01) C22B 26/20 (2006.01) E21B 37/06 (2006.01) E21B 43/00 (2006.01)

Patent

CA 2137007

The present invention relates to the use of low frequency sonic energy in the sonic frequency range for enhancing the disso- lution of alkaline earth metal scales using a scale-removing solvent comprising an aqueous alkaline solution having a pH of about 8 to about 14 and containing EDTA or DTPA and a catalyst or synergist, preferably an oxalate anion. When the scale-rem- oving solvent is contacted with a surface containing a scale deposit while simultaneously transmitting low frequency sonic energy through the solvent, substantially more scale is dissolved at a faster rate than previously possible. The frequency of the sonic ener- gy is within the range of 1.5 to 6.5 kHz and preferably 1.5 kHz.

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