An Improved Method and Device for Making a Lateral Opening Out of a Wellbore

A method for making lateral openings out of a wellbore in a ground formation where at least one laterally directed drill string is movable in the axial direction inside a motherbore tubular, and where the leading end portion of the drill string is equipped with the drill bit that is driven by a rotatable drill string, the method comprising:

• connecting to the rotatable drill string inside the motherbore tubular an axially movable fluid driven engine to rotate the drill string inside the motherbore tubular;
• and
• directing flow in the motherbore tubular through the fluid driven engine to create rotation of the drill bit via the drill string.

A pipe device for making lateral openings out of a wellbore in a ground formation where at least one laterally directed rotatable drill string is movable in the axial direction inside a motherbore tubular, and where the leading end portion of the drill string is equipped with a drill bit that is driven by the rotatable drill string, wherein a fluid driven engine axially movable in the motherbore tubular is connected to the rotatable drill string inside the motherbore tubular and designed to be driven by fluid flow in the motherbore tubular.