System for unsticking pipes of a drill string of a drilling apparatus

Abstract

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.

1 - 20 . (canceled) 
     
     
         21 . An unstuck system for stuck drill pipes of a drill string of a drilling apparatus adapted to drilled wells to extract fluids or mud, wherein
 said drill string comprises a top portion and a bottom portion comprising at least one drill pipe susceptible of being stuck by a soil surrounding a sunk well, and a torsion coupling system adapted to release the top portion from the bottom portion of the drill string when there are stuck drill pipes being stuck, and   said unstuck system is associated with said torsion coupling system such that once the top portion is released from the bottom portion of the drill string the torsion coupling system transfers a rotation to the unstuck system, said unstuck system comprising at least one forced vibration generator comprising at least one axially movable element adapted to generate at least one vibration that propagates to a portion free from being stuck of the bottom portion of the drill string comprised between the torsion coupling system and the stuck drill pipes, vibrations induced in the portion free from being stuck are comprised in a band of induced frequencies close or corresponding to a resonance frequency of the portion free from being stuck, said induced vibrations propagate in the stuck drill pipes and into the surrounding soil.   
     
     
         22 . The unstuck system according to  claim 21 , wherein said portion free from stuck comprises drill collars of the drill string. 
     
     
         23 . The unstuck system according to  claim 22 , wherein said torsion coupling system transfers the rotation to the unstuck system by means of a rotating shaft comprising a grooved profile which is connected to the torsion coupling system. 
     
     
         24 . The unstuck system according to  claim 23 , wherein
 the rotating shaft comprises at least one interrupted periodic profile, and   the unstuck system comprises said at least one axially moveable element which is at least one hammer mounted with at least one elastic means of the unstuck system,   said at least one hammer is slidably mounted in an axis with a drill pipe of the bottom portion of the drill string,   said at least one hammer comprises at least one cam which is guided in rotation by said periodic profile, such that said at least one hammer is periodically adapted to compress said at least one elastic means and to be pushed by said at least one elastic means along the axis of the drill string, and   a second drill pipe lower than the drill pipe comprises at least one anvil element adapted to be struck by said at least one hammer.   
     
     
         25 . The unstuck system according to  claim 24 , wherein
 said at least one hammer is a single hammer which is a hollow cylinder concentric with said rotating shaft, and   said single hammer comprises said at least one cam.   
     
     
         26 . The unstuck system according to  claim 24 , wherein
 said at least one hammer is a multiplicity of hammers, each of which comprises at least one cam, and   said multiplicity of hammers is arranged around said rotating shaft.   
     
     
         27 . The unstuck system according to  claim 23 , wherein
 said at least one axially moveable element is at least one tubular movable component concentric with said rotating shaft, and comprises at least one cam adapted to be guided by at least one periodic profile of the rotating shaft, and   two elastic means are mounted at two axial ends of said at last one movable component, such elastic means being adapted to be periodically compressed by said at least one movable component and to push said at least one movable component.   
     
     
         28 . The unstuck system according to  claim 27 , wherein said at least one movable component comprises at least one second cam mounted with a seat of a drill pipe to transmit translational movement to said drill pipe. 
     
     
         29 . The unstuck system according to  claim 27 , wherein said at least one periodic profile comprises a bottom portion and a top portion at a height level higher than the bottom portion. 
     
     
         30 . The unstuck system according to  claim 23 , comprising an annulus concentric and integral with the rotating shaft and in flow communication with a well drilling fluid, at least one annular chamber arranged at one of two axial ends of the annulus, wherein
 said at least one axially moveable element is a piston of said annular chamber, and   said at least one piston is adapted to periodically compress at least one elastic means and to be pushed by the at least one elastic means.   
     
     
         31 . The unstuck system according to  claim 30 , wherein
 said annular chamber comprises at least one first radial through opening, and   said rotating shaft comprises at least one second radial through opening in flow communication with the well drilling fluid flowing inside the rotating shaft, during the rotation of the rotating shaft said at least one second radial through opening of the rotating shaft is at said at least one first through opening of the annular chamber being adapted to let the fluid pass towards said at least one annular chamber to move said at least one piston.   
     
     
         32 . The unstuck system according to  claim 31 , wherein said annulus comprises at least one third radial through opening adapted to let the fluid pass from inside the drill pipe to outside of the drill pipe, at least one first axial through opening in flow communication with at least one second axial through opening of said at least one annular chamber, where said at least one first axial through opening of said annulus is in flow communication with said at least one third radial through opening of said annulus. 
     
     
         33 . The unstuck system according to  claim 30 , wherein said rotating shaft is tubular and hollow adapted to let the well drilling fluid pass. 
     
     
         34 . The unstuck system according to  claim 21 , comprising at least one cam and at least one gear-shaped or sinusoidal-shaped or curvilinear-shaped profile, wherein at least one axially moveable element of the axial forced vibration generator is at least one annulus concentric with a drill pipe where the at least one annulus is mounted. 
     
     
         35 . The unstuck system according to  claim 34 , wherein said at least one axially moveable element of the axial forced vibration generator comprises two annuli concentric with each other. 
     
     
         36 . The unstuck system according to  claim 34 , wherein said at least one annulus comprises said at least one cam and said top portion of the drill string comprises said at least one gear-shaped or sinusoidal-shaped or curvilinear-shaped profile. 
     
     
         37 . The unstuck system according to  claim 34 , wherein
 said at least one annulus comprises said at least one gear-shaped or sinusoidal-shaped or curvilinear-shaped profile, and   said top portion of the drill string comprises said at least one cam.   
     
     
         38 . The unstuck system according to  claim 21 , comprising a series of magnets, wherein
 at least one axially moveable element of the axial forced vibration generator is at least one annulus with a drill pipe where the at least one annulus is mounted, where said series of magnets are mounted with at least one of said bottom portion of the drill string and one of said at least one annulus.   
     
     
         39 . The unstuck system according to  claim 21 , comprising at least one thrust bearing mounted at ends of said at least one elastic means of the unstuck system, where said at least one elastic means is mounted with said at least one axially moveable element. 
     
     
         40 . A process for unstucking stuck drill pipes of a drill string of a drilling apparatus adapted to drilled wells to extract fluids or mud, wherein said drill string comprises a top portion and a bottom portion comprising said drill pipes stuck by a soil surrounding a sunk well, said process comprising:
 disconnecting the top portion from the bottom portion of the drill string when there are stuck drill pipes by means of a torsion coupling system;   transferring a power to the unstuck system by means of the torsion coupling system after the top portion has been released from the bottom portion of the drill string; and   generating axial forced vibrations by means of at least one forced vibration generator of the unstuck system according to  claim 21 , where said at least one axial forced vibration generator comprises at least one axially moveable element, wherein   the generating comprises a generation of at least one vibration by said at least one axially moveable element,   the generating comprises in succession a propagation of said at least one drill pipe vibration of a portion free from being stuck of the bottom portion of the drill string which is comprised between the torsion coupling system and the stuck drill pipes, where the vibrations induced in the portion free from being stuck are comprised in a band of induced frequencies close or corresponding to a resonance frequency of the portion free from being stuck, and the generating comprises in succession that said induced vibrations propagate in the stuck drill pipes and into the surrounding soil.