FIELD: soil or rock drilling.
SUBSTANCE: group of inventions refers to the field of controlled drilling in the development of oil fields and, in particular, to controlled drilling with liner and its cementing using the retrievable bottom unit of the drill string. Drilling-with-liner system comprises a drill pipe working string containing a liner, liner hanger attached to the liner hanger lowering tool, borehole expander and pusher. There are releasing pins in the liner hanger lowering tool. They are cuttable to detach the liner and liner hanger from the liner hanger lowering tool. In this case, it is possible to remove the drill string from the well, while the liner remains in place. Gate connection is provided. It is designed to attach a liner hanger lowering tool to the liner suspension, when the working string of drill pipes is retracted back into the borehole. This is provided in such a way, so that the drilling-with-liner can be performed using a pusher until the pusher reaches its full stroke length. System further comprises at least one additional gate connection. It is configured to attach the liner hanger lowering tool to the liner hanger after the drill string has been inserted, so that the drilling-with-liner can be performed using a pusher until the pusher reaches its full stroke length. System also contains a lower gate connection. It is configured to attach the liner hanger lowering tool to the liner hanger. Opposite the liner hanger there is a no-go expansion cone. It is designed for controlled drilling with liner.
EFFECT: technical result – increased reliability of operation of the drilling-with-liner system.
13 cl, 28 dwg
