Pipe anchoring and expanding unit for producing a slim well and method for producing a slim well using the same

An anchoring and expanding unit, comprising:

• an anchoring device and an expanding device, which are reciprocally and removably constrained, wherein
• the anchoring device is expandable;
• the expanding device comprises a series of expanding elements, each of the expanding elements is stoppable in at least two different operative positions each of which is radially extracted with respect to the expanding device, the at least two different operative positions are each radially extracted from an initial position of the expanding elements, each of the expanding elements is stopped in a first of the at least two different operative positions by a stopping device, and when the stopping device is sheared, each of the expanding elements is movable to a second of the at least two different operative positions;
• the expanding elements protrude radially from the expanding device;
• and
• the anchoring and expanding unit is suitable for drilling a well.