公开(公告)号：US20210404281A1

公开(公告)日：2021-12-30

申请号：US17288202

申请日：2019-10-23

申请人： ENI S.P.A.

发明人： Gilberto TOFFOLO ,  Andrea BIONDI ,  Paolo FERRARA

IPC分类号： E21B31/00

摘要： An unstuck system of stuck drill pipes of a drill string of a drilling apparatus adapted to drilled wells to extract fluids or mud includes a torsion coupling system adapted to disconnect an upper portion from a bottom portion including the stuck drill pipes of the drill string and to transfer a rotation to the unstuck system. The unstuck system includes at least an axial forced vibration generator including at least one axially movable element adapted to generate at least a vibration which is propagated to pipes of a portion free from being stuck, where the induced vibrations fall within a band of induced frequencies near or corresponding to a resonance frequency of the portion free from being stuck.

公开(公告)号：US20170314355A1

公开(公告)日：2017-11-02

申请号：US15520629

申请日：2015-10-19

申请人： ENI S.p.A.

发明人： Paolo FERRARA ,  Giuseppe DE GRANDIS ,  Andrea BIONDI

IPC分类号： E21B29/08 ,  E21B34/04 ,  E21B33/064 ,  E21B34/16 ,  E21B33/035

摘要： A safety valve for extraction wells, configured to be installed on a well head and to enclose a tubular material portion inserted inside the well. The tubular material is internally hollow to contain and transport substances extracted from the well. The safety valve includes: a central hole through which the tubular material passes; a blocking system configured to keep the tubular material to be cut fixed with respect to the safety valve; a cutting and closing group configured to cut and close the well under certain operative conditions; and a sealing mechanism configured to effect watertight closing of the well, after the cutting. The cutting and closing group includes a hole saw housed in a respective chamber of the cutting and closing group, rotated by a motorized actuator, and configured to move in a controlled mode along a substantially orthogonal direction with respect to a development direction of the well.