Statoil Petroleum As

Innovation Energy As

Dsolve As

Astrid Bjørgum

Marcus Fathi

Pål Viggo Hemmingsen

Carlos J Delgado

Nils-Inge Nilsen

Gjermund Grimsbo

Bjarne Bugten

Torgeir Wenn

A downhole tool, for removing sections of metal tubing, said downhole tool comprising at least one conductive element being arranged to corrode a section of metal tubing using an electrolytic process, said conductive element being made of electric conductive material, an apparatus to establish a connection to the metal tubing, and a source of electrical power.

Downhole tool

There is provided a method for removing iron-containing casing from a well bore comprising providing a cathode in said well bore, wherein said cathode is connected to the negative pole of a power source; connecting said iron-containing casing to the positive pole of said power source; injecting an electrolyte into said well bore, wherein said electrolyte contacts said iron-containing casing and said cathode; applying a current so that the iron in said iron-containing casing is oxidised to iron cations; allowing said iron cations to dissolve in said electrolyte; and removing said electrolyte from said well bore. Also provided are a system for removing iron-containing casing from a well bore, a method for monitoring the removal of an iron-containing casing from a well bore and a method for plugging and abandoning a well.

Method for removing iron-containing casing from a well bore

Growing community of inventors

Trondheim, Norway

Astrid Bjørgum