Method for dissolving oilfield scale

Details Method for dissolving oilfield scale Method for dissolving oilfield scale

2007-03-23

2008-12-30

Carrillo, Sharidan (Department: 1792)

Cleaning and liquid contact with solids

Processes

Using sequentially applied treating agents

C588S020000, C588S315000, C166S312000, C507S239000, C210S698000, C210S711000, C210S714000, C134S002000, C134S003000, C134S028000, C134S029000, C134S034000, C134S036000, C134S041000, C134S042000

Reexamination Certificate

active

07470330

ABSTRACT:
A method of removing metal scale from surfaces that includes contacting the surfaces with a first aqueous solution of a chelating agent, allowing the chelating agent to dissolve the metal scale, acidifying the solution to form a precipitant of the chelating agent and a precipitant of the metal from the metal scale, isolating the precipitant of the chelating agent and the precipitant of the metal from the first solution, selectively dissolving the precipitated chelating agent in a second aqueous solution, and removing the precipitated metal from the second solution is disclosed.

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International Search Report issued in International Application No. PCT/US2007/064823 dated Jul. 16, 2007 (2 pages).
PCT Written Opinion issued in International Application No. PCT/US2007/064823 dated Jul. 16, 2007 (5 pages).

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