Method of controlling landing strings in offshore operations

Abstract

A method and system of operating a landing string utilized on a floating platform. The landing string is disposed within a marine riser, with the marine riser being connected to a subsea production tree, and wherein the subsea production tree contains internal conduits communicating controls through a series of stab passageways. The method comprises providing a tubing hanger operatively connected to the landing string, delivering hydraulic or electrical controls from the floating platform through a control system umbilical to a junction plate operatively attached to the subsea production tree. The method further comprises landing the tubing hanger into the subsea production tree, establishing control of the tubing hanger by providing the hydraulic controls to the tubing hanger with the series of stab passageways through the subsea production tree, and establishing control of the completion bottom hole assembly with the stab passageways. In the preferred embodiment, the landing string has attached thereto a completion bottom hole assembly that will be placed in the well.

1 . A method of operating a landing string utilized on a floating platform, with the landing string being disposed within a marine riser, the marine riser having a first end connected to the floating platform and a second end connected to a subsea production tree, said subsea production tree containing internal conduits communicating controls through a series of stab passageways, and wherein the landing string contains a completion bottom hole assembly, the method comprising:
 providing a tubing hanger operatively connected to the landing string;   delivering hydraulic controls from the floating platform through a control system umbilical to a junction plate operatively attached to the subsea production tree;   landing a tubing hanger attached to the landing string into the subsea production tree;   establishing control of the tubing hanger by providing the hydraulic controls to the tubing hanger with the series of stab passageways through the subsea production tree;   establishing control of the completion bottom hole assembly with the series of stab passageways.   
   
   
       2 . The method of  claim 1  wherein the completion bottom hole assembly includes a surface controlled sub-surface valve (SCSSV), electrical gauges and chemical injection mandrels. 
   
   
       3 . The method of  claim 2  further comprising: maintaining status of the unlatched elements during disconnect activities, wherein the disconnect point will require hydraulic checking stabs, wherein the hydraulic checking stabs will trap hydraulic pressure allowing the latch to reconnect and re-establish communications. 
   
   
       4 . The method of  claim 2  further comprising: monitoring the pressure status of the completion bottom hole assembly, wherein pressure status is monitored with a pressure transducer, and wherein the pressure transducer can collect and transmit data to surface either by electrical conduit or other form of data transmission. 
   
   
       5 . A method of landing a landing string to a subsea production tree from a floating platform, wherein a marine riser is attached at a first end to the floating platform and at a second end to a blowout preventor system (BOP system), with the landing string having a subsea test tree and retainer valve operatively associated therewith, and wherein the landing string has attached thereto a tubing hanger, and wherein the tubing hanger is attached to a bottom hole assembly, the method comprising:
 providing an umbilical operatively attached to a junction plate on the subsea production tree, wherein said umbilical is positioned on an exterior portion of the marine riser;   lowering the landing string into an interior portion of the marine riser;   landing the tubing hanger into the subsea production tree;   establishing communication with the tubing hanger with the umbilical through stab means located within the subsea production tree;   controlling the subsea test tree, the retainer valve and the bottom hole assembly with the umbilical.   
   
   
       6 . The method of  claim 5  wherein the subsea production tree is connected to a subterranean well, and the bottom hole assembly contains a completion string concentrically placed within the well in order to produce fluids and gas from the subterranean well.