Abstract: There is provided herein a method for preparing a wellbore comprising: positioning one or more sections of piping within the wellbore as part of a piping string by attaching the one or more sections to additional similar sections of piping, wherein at least a region of an external surface of the one or more sections of piping is shaped to include a pattern of indents and/or protrusions, and wherein the shaped region of the external surface is located so as to be exposed to a surrounding external environment when the section of piping is coupled to the additional similar sections of piping as part of the piping string. There is also provided herein a section of piping for use as part of a wellbore structure and a method for producing a section of piping for use as part of a wellbore structure.

Abstract: There is provided a method for preparing a wellbore for insertion of a barrier, the method comprising: providing a section of tubing or formation within the wellbore having a modified internal surface that is shaped such that a region adjacent the modified internal surface can be filled with barrier material and the barrier material can solidify to interlock with and be anchored by the modified internal surface.

Abstract: 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.