Hydraulic well packer

Abstract

A hydraulic packing device for wellbores, known in the art as “packer”, which is a retrievable device and is used in downhole operations, that is also part of the tools used in wellbore operations, such as oil, water or gas wells, or wells of similar fluids is provided. More specifically, the main object of the invention is a double-latch packer with hydraulic fastening and packing pressure function, double retreat integrated assembly, with elements of rubber packing, which has the advantage of being able to work selectively on facilities with one packer or multiple packers, with the advantage of fastening or releasing the packer selectively in oil, water or gas wells, or wells of similar fluids.

1 . Hydraulic well packer of the retrievable type for downhole operations into a wellbore having a casing, wherein the packer comprises:
 a packing assembly for sealing against the casing,   an anchoring assembly for anchoring the packer against the casing,   a mandrel, with the packing assembly and the anchoring assembly being mounted in the mandrel,   wherein the mandrel comprises an upper mandrel and a lower mandrel axially connected to each other through a threaded connection,   and wherein said packing assembly and said anchoring assembly are axially connected to each other and coaxially arranged around said upper and lower mandrels.   
   
   
       2 . A hydraulic well packer according to  claim 1 , wherein a hydraulic assembly is comprised of said upper and lower mandrels and said upper and lower mandrels define, together with said packing and anchoring assemblies, an annular gap forming a hydraulic chamber for receiving hydraulic pressure for actuating said packing, hydraulic and anchoring assemblies. 
   
   
       3 . A hydraulic well packer according to  claim 2 , wherein said threaded connection between said upper and lower mandrels is a quick threaded connection, and wherein said upper and lower mandrels are connected through shear pins. 
   
   
       4 . A hydraulic well packer according to  claim 3 , wherein said upper mandrel is connected to a fastening assembly through at least one shear pin, wherein the fastening assembly is coaxially arranged around said upper mandrel and axially connected to the packing assembly in a manner that the assemblies are arranged in a way down as follows: fastening assembly, hydraulic assembly, packing assembly and anchoring assembly. 
   
   
       5 . A hydraulic well packer according to  claim 4 , wherein said fastening assembly comprises a pin carrier having a plurality of shear pins retained against corresponding notches in the upper mandrel, with the pin carrier being connected to a segment carrying sleeve that houses a segment, a segment carrying cone and a friction ring. 
   
   
       6 . A hydraulic well packer according to  claim 5 , wherein the segment carrying sleeve has a plurality of battlement-shaped teeth cut at a lower portion thereof, and said upper mandrel has a plurality of battlement-shaped teeth cut at a lower portion thereof and spaced apart from, but in front of, said plurality of battlement-shaped teeth of the segment carrying sleeve. 
   
   
       7 . A hydraulic well packer according to  claim 6 , wherein said segment has a saw tooth that is cut in the interior diameter of the segment, the saw tooth forming a unidirectional latch with said upper mandrel. 
   
   
       8 . A hydraulic well packer according to  claim 7 , wherein said hydraulic assembly comprises, together with said upper and lower mandrels, a hydraulic sleeve that is threadably connected, at an upper portion thereof, to said segment carrying sleeve, said hydraulic sleeve having, at an upper portion thereof, pressure equalizing orifices, with said hydraulic sleeve being connected, at a lower portion thereof, to a joint sleeve. 
   
   
       9 . A hydraulic well packer according to  claim 8 , wherein said packing assembly comprises a packing seals-carrying sleeve connected, at an upper part thereof, to said joint sleeve, said lower mandrel including a locking ring housed under compression between the lower mandrel and the packing seals-carrying sleeve and capable of expanding if uncovered by the packing seals-carrying sleeve. 
   
   
       10 . A hydraulic well packer according to  claim 9 , wherein said anchoring assembly comprises a sleeve housing a plurality of clamp shoes, with each shoe being actuated by an upper cone connected to the packing seals-carrying sleeve through a gauge ring, and a lower cone arranged in a lower portion of the lower mandrel. 
   
   
       11 . A hydraulic well packer according to  claim 10 , wherein said hydraulic chamber is formed, at an inner side thereof, by the lower mandrel and the upper mandrel, and, at an outer side thereof, by the hydraulic sleeve and the joint sleeve.