Downhole apparatus and method of use

A method of positioning a tool at a downhole location, the method comprising:

• providing a tool assembly comprising a tool or toolstring and a positioning apparatus coupled to the tool or toolstring, wherein the apparatus comprises a body and a plurality of support elements located on the body, the support elements comprising a retracted position and a set position the support elements define one or more support surfaces;
• lowering the apparatus in a wellbore during a first lowering phase past an upper restriction in the wellbore with an inner diameter less than a wellbore inner diameter, in which the support elements are in the retracted position, wherein a maximum outer diameter of the apparatus is less than the inner diameter of the upper restriction;
• opening the support elements to the set position;
• after opening the support elements to the set position, lowering the apparatus in the wellbore during a second lowering phase towards a second lower restriction in the wellbore, with the support elements in the set position and while using a plurality of rollers positioned on the body to enable the apparatus to be lowered in the wellbore while maintaining the plurality of support elements in the set position;
• and
• bringing the support elements into contact with the second lower restriction in the wellbore, thereby supporting the apparatus in the wellbore and preventing downward movement of the apparatus in the wellbore past the second lower restriction.

A method of cutting a downhole wellbore tubular, the method comprising:

• providing a tool assembly comprising a tool or toolstring and a positioning apparatus coupled to the tool or toolstring, wherein the apparatus comprises a body and a plurality of support elements located on the body, the support elements comprising a retracted position and a set position the support elements define one or more support surfaces;
• lowering the apparatus in a wellbore during a first lowering phase past an upper restriction in the wellbore with an inner diameter less than a wellbore inner diameter, in which the support elements are in the retracted position, wherein a maximum outer diameter of the apparatus is less than the inner diameter of the upper restriction;
• opening the support elements to the set position;
• after opening the support elements to the set position, lowering the apparatus in the wellbore with the support elements in the set position to a second lower restriction in the wellbore while using a plurality of rollers positioned on the body to enable the apparatus to be lowered in the wellbore while maintaining the plurality of support elements in the set position, and subsequently causing the support elements to contact the second lower restriction to support the apparatus in the wellbore and prevent downward movement of the apparatus in the wellbore past the second lower restriction;
• and
• operating a downhole electric cutting tool of the assembly to cut a downhole wellbore tubular.