Downhole tool string

A downhole tool string for displacing at least a tool section in a well in a radial direction in a wall of a well tubular metal structure extending along an axial direction in relation to the radial direction, comprising:

• a tool body having an outer face and a tool centre axis along the axial direction, a centre plane extending along and enclosing the centre axis, dividing the tool body into a first body half and a second body half, the tool body having a common piston,
• an operational machining tool configured to perform a machining operation in the well tubular metal structure, and to extend from the outer face of the first body half in a first radial direction in relation to the tool centre axis,
• a first displacement element extendable from the outer face of the second body half of the tool body configured to displace the tool body towards the wall for arranging the operational machining tool close to the wall, the first displacement element being extendable between a retracted position and a projected position, wherein the downhole tool string further comprises a first distancing element extendable from the outer face of the first body half, the first distancing element having a retracted position and a projected position, and in the projected position of the first distancing element a distance is provided between the outer face and the wall of the well tubular metal structure, and
• wherein the first displacement element in the projected position extends from the outer face at a first length, and the first distancing element in the projected position extends from the outer face at a second length, the first length being longer than the second length,
• wherein each of the first displacement element and the first distancing element is operatively connected to the common piston, the first displacement element and the first distancing element being configured to be moved from their retracted positions to their projected positions by axial movement of the common piston, and
• wherein, in the retracted position of the first displacement element and the retracted position of the first distancing element, the first distancing element and the first displacement element are positioned within the outer face of the tool body, and, in the projected position of the first displacement element and the projected position of the first distancing element, the first distancing element and the first displacement element extend from within the tool body to the outside of the outer face of the tool body.