公开(公告)号：US20170241226A1

公开(公告)日：2017-08-24

申请号：US15513082

申请日：2015-09-18

Applicant: STATOIL PETROLEUM AS

Inventor： Marcus FATHI ,  Siddhartha Francois LUNKAD

IPC: E21B29/02 ,  E21B43/40 ,  E21B47/00 ,  E21B33/13 ,  E21B33/12

CPC classification number: E21B29/02 ,  E21B33/12 ,  E21B33/13 ,  E21B43/40 ,  E21B47/00

Abstract: There is provided a method of chemically removing iron-containing casing from a well bore comprising injecting an acidic solution into said well bore, wherein said solution contacts said iron-containing casing and thereby accelerates oxidation of iron to iron cations, allowing said iron cations to dissolve in said solution, and removing said solution from said well bore. There is further provided a batch method of removing iron-containing casing from a well bore comprising injecting an acidic solution into said well bore, wherein said acidic solution contacts said iron-containing casing and thereby accelerates oxidation of iron to iron cations, and allowing said iron cations to dissolve in said acidic solution, wherein said well bore is at least partially open to the atmosphere.