Running and retrieval tool

Abstract

A running-retrieving tool for use in oilfield operations comprises a first section having a bonnet and a split retainer, the first section having a cavity with an inner diameter adapted to allow the insertion therethrough of a second section and wherein the first section is adapted to be secured to a tool. The second section has an elongated body with an external diameter smaller than the internal diameter of the first section. The second section has a track, an entry channel, and a release channel. The second section is adapted to be mounted onto a drillstring and is releasably inserted inside the cavity of the first section through the insertion of J-pins inside the track.

1 . A running-retrieving tool for use in oilfield operations, said tool comprising:
 a first section comprising a bonnet and a split retainer, said first section comprising a cavity having an inner diameter adapted to allow the insertion therethrough of a second section and wherein said first section is adapted to be secured to a tool (such as a bearing assembly); and   said second section having an elongated body having an external diameter smaller than the internal diameter of said first section, said second section comprising:
 a track adapted to secure a retaining means extending from said split retainer thereinto; 
 an entry channel adapted to receive said retaining means positioned on said first section; 
 a release channel adapted to allow said retaining means to be released from said track; 
   
       wherein said second section being adapted to be mounted onto a drillstring or the like and being releasably insertable inside said cavity of said first section through the insertion of said retaining means inside said track. 
     
     
         2 . The running-retrieving tool according to  claim 1 , wherein the retaining means comprise a plurality of J-pins extending radially inwardly from said first section and adapted to fit within said track located on said second section. 
     
     
         3 . The running-retrieving tool according to  claim 1 , wherein said track comprises an upper lifting shoulder and a lower shoulder portion and a channel located therebetween, wherein said upper lifting shoulder and lower shoulder portion can be separated from one another upon exertion of pressure onto the lower shoulder portion by said retaining means. 
     
     
         4 . The running-retrieving tool according to  claim 3 , wherein said lower shoulder portion of the track comprises a plurality of channel entry points adapted to direct a corresponding plurality of retaining means into the track. 
     
     
         5 . The running-retrieving tool according to  claim 3 , wherein plurality of channels are funnel-like entry points. 
     
     
         6 . The running-retrieving tool according to  claim 1 , wherein the upper lifting section of the track comprises:
 a plurality of angled wall sections, each angled wall section comprising a lower end and an upper end and;   a nesting gap located at said upper end of each one of said plurality of angled wall sections,   
       wherein said nesting gap adapted to secure said retaining means during operation when said tool is travelling in a downward direction inside a wellbore. 
     
     
         7 . The running-retrieving tool according to  claim 1 , wherein, during operation, upon exertion of a sufficient pressure on the lower shoulder portion of said track, the lower shoulder portion will separate by moving longitudinally away from said upper lifting shoulder thereby creating a plurality of release channels (exit points) associated with corresponding retaining means to release said second section from said first section and leave the first section at a pre-determined location within the wellbore. 
     
     
         8 . The running-retrieving tool according to  claim 1 , where said lower shoulder portion and said upper lifting portion comprise, at their meeting edge, a complimentary nesting profile adapted to maintain said lower should portion and upper lifting portion in place during rotational movement of a drillstring. 
     
     
         9 . The running-retrieving tool according to  claim 8  where said complimentary nesting profile comprises a crenellated pattern. 
     
     
         10 . The running-retrieving tool according to  claim 1 , where said lower shoulder portion has a plurality of projections which combine with a plurality of complimentary projections located on a lower portion of the lifting shoulder of the track to form said plurality of funnel-like entry points. 
     
     
         11 . The running-retrieving tool according to  claim 1 , where said entry channel comprises a first side member located on a first side of said channel and a second side member located on a second side of said channel, wherein each of member being angled towards a track entry point. 
     
     
         12 . The running-retrieving tool according to  claim 1 , where said first side member being stationary and wherein said second side member being comprised of: an upper part which is stationary and a lower part which is movable. 
     
     
         13 . The running-retrieving tool according to  claim 1 , where said upper part of said second side member being located on said upper lifting shoulder of said track and said lower part of said second side member being located on said lower shoulder portion of said track. 
     
     
         14 . The running-retrieving tool according to  claim 1 , where said nesting gap is a semi-circular opening adapted to secure in place the bearing assembly to the running-retrieval tool. 
     
     
         15 . The running-retrieving tool according to  claim 1 , where said retaining means nesting gap is offset from said entry channel 
     
     
         16 . The running-retrieving tool according to  claim 1 , where said nesting gap comprises, on a first adjacent side, an angled wall to allow the upward movement of said retaining means to be directed the channel towards said nesting gap. 
     
     
         17 . The running-retrieving tool according to  claim 1 , where said nesting gap comprises, on a second adjacent side a wall parallel to a longitudinal axis of said drillstring. 
     
     
         18 . A running-retrieving tool for use in oilfield operations, said tool comprising:
 a first section comprising a bonnet and a split retainer, said first section comprising a cavity having an inner diameter adapted to allow the insertion therethrough of a second section and wherein said first section is adapted to be secured to a tool (such as a bearing assembly); and   said second section having an elongated body having an external diameter smaller than the internal diameter of said first section,   
       wherein said first and said second section are releasably secured together in operation by a plurality of concentrically directed J-pins located on said first section engaging with a track located on said second section.