Apparatus for performing well work on floating platform

Abstract

An apparatus for supporting a well intervention device connected to a well extending from a floating platform. The apparatus comprises a frame assembly having a first and second end, and wherein the first end is positioned on the platform. The apparatus includes a crown assembly attached to the second end of the frame assembly, a motion compensator member attached to the frame assembly for compensating for vertical movements of the platform, and a travel head having a first connector and a second connector, and wherein the first connector is attached to the compensator member and the second connector attaches the travel head to the well intervention device.

1 . An apparatus for supporting a well intervention device connected to a well extending from a floating platform, the apparatus comprising:
 a frame assembly having a first end and a second end, wherein said first end is positioned on the platform;   a crown section assembly attached to the second end of said frame assembly;   a motion compensator means, attached to said frame assembly, for compensating for vertical movements of the platform;   a travel head having a first connector and a second connector, and wherein said first connector is attached to said compensator means and said second connector attaches said travel head to the well intervention device.   
     
     
         2 . The apparatus of  claim 1  wherein said motion compensator means comprises:
 a first motion compensator on a first side of said frame assembly;   a second motion compensator on a second side of said frame assembly;   power pack means for suppling a power medium to said first and said second motion compensator.   
     
     
         3 . The apparatus of  claim 1  wherein said motion compensator means comprises:
 a cylinder having a piston disposed therein;   power pack means for supplying a power medium to said cylinder and wherein said piston is responsive to said power medium.   
     
     
         4 . The apparatus of  claim 1  wherein said motion compensator means includes a tension line extending therefrom and wherein said tension line is connected to said travel head. 
     
     
         5 . The apparatus of  claim 4  wherein said crown section assembly contains a sheave that has placed therein said tension line. 
     
     
         6 . The apparatus of  claim 1  wherein said motion compensator means comprises a cylinder having a piston disposed therein and wherein as said platform raises, said piston retracts into said cylinder thereby keeping said travel head in the same position and as said platform lowers, said piston extends from said cylinder thereby keeping said travel head stationary relative to the well intervention device. 
     
     
         7 . The apparatus of  claim 6  wherein said frame assembly includes a plurality of frames, and wherein said plurality of frames are stackable in an array to a desired height. 
     
     
         8 . The apparatus of  claim 7  wherein the well intervention device includes a first well intervention device that is attached to a first well and a second well intervention device that is attached to a second well, and wherein said travel head is fixedly attached to said first and said second well intervention device so that the well intervention work can be performed. 
     
     
         9 . An apparatus for supporting a first well intervention device connected to a well extending from a floating platform comprising:
 a frame assembly having a first end and a second end, wherein said first end is positioned on the platform;   a crown section assembly attached to the second end of said frame assembly;   a motion compensator member, attached to said frame assembly, for compensating for vertical movements of the platform;   means for supplying a power medium to said motion compensator member;   a travel head having a first connector and a second connector, and wherein said first connector is operatively attached to said motion compensator member and said second connector is attached to the first well intervention device.   
     
     
         10 . The apparatus of  claim 9  wherein said motion compensator member is operatively attached to said first connector with a tension line leading from said motion compensator member and wherein said crown section assembly contains a sheave that has placed therein said tension line leading from said motion compensator member and connected to said travel head. 
     
     
         11 . The apparatus of  claim 9  wherein said motion compensator member comprises:
 a first motion compensator on a first side of said frame assembly; and,   a second motion compensator on a second side of said frame assembly.   
     
     
         12 . The apparatus of  claim 10  wherein said motion compensator member comprises:
 a cylinder having a piston disposed therein, said piston being responsive to the power medium.   
     
     
         13 . The apparatus of  claim 12  wherein said travel head includes an anchor line extending therefrom and wherein said anchor line is attached to the ocean floor. 
     
     
         14 . The apparatus of  claim 13  wherein as said platform raises, said piston retracts into said cylinder thereby keeping said travel head in the same position and as said platform lowers, said piston extends from said cylinder thereby keeping said travel head in the same position. 
     
     
         15 . The apparatus of  claim 14  wherein said frame assembly includes a plurality of frames, and wherein said plurality of frames are stackable in an array. 
     
     
         16 . The apparatus of  claim 15  wherein said first well intervention device is attached to a first well and a second well intervention device is attached to a second well, and wherein said travel head is fixedly attached to said first and said second well intervention device. 
     
     
         17 . The apparatus of  claim 11  wherein said first motion compensator has a first tension line leading therefrom, said first tension line being led to a first sheave positioned in said crown section assembly; and wherein said second motion compensator has a second tension line leading therefrom, said second tension line being lead to a second sheave positioned in said crown section assembly. 
     
     
         18 . A method for performing well intervention work on a floating platform, the floating platform having a first well extending there through, with the first well being connected to a first well intervention device, the method comprising:
 providing an apparatus for supporting the first well intervention device, the apparatus including a frame having a bottom end and a top end, wherein said bottom end is positioned on the platform; a crown assembly attached to the top end of said frame; a cylinder, attached to said frame, with a piston extending therefrom;   attaching a travel head, located within said frame, to a tension line extending from the cylinder;   attaching the travel head to the first well intervention device;   positioning said tension line through a sheave, said sheave being attached to the crown assembly;   retracting said piston into said cylinder as the ocean and platform rises;   extending said tension line with said piston so that as said platform rises, the tension line remains under tension;   maintaining said travel head in a stationary position relative to the first well as the floating platform and the frame rise with the ocean;   performing the well intervention work with the first well intervention device while the first well intervention device remains in the stationary position.   
     
     
         19 . The method of  claim 18  wherein the surface of the ocean lowers and the method further comprises:
 lowering the floating platform as the surface of the ocean lowers;   extending said piston from said cylinder;   contracting said tension line so that the tension line remains in tension;   maintaining said travel head in a stationary position relative to the well as the floating platform and the frame lower with the ocean.   
     
     
         20 . The method of  claim 19  wherein said platform further contains a second well disposed there through, and a second well intervention device is attached to the second well and wherein said travel head is fixedly attached to the first and the second well intervention device and wherein the method further comprises:
 performing well intervention work on the first well utilizing the first well intervention device;   performing well intervention work on the second well utilizing the second well intervention device.