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.

Description

[0001]This application is a Continuation-in-Part Application of my co-pending provisional application Ser. No. 60 / 826,289, filed on 20 Sep. 2006 by Inventor Ross Trewhella, and entitled “Method of Functioning and / or Monitoring Temporarily Installed Equipment Through a Tubing Hanger”.BACKGROUND OF THE INVENTION[0002]This invention relates to a method of controlling equipment in offshore operations. More specifically, but without limitations, this invention relates to a system and method of landing and locking completions and other bottom hole assemblies with a landing string from a semi-submersible or dynamically positioned drilling vessel, wherein the landing string contains well control equipment.[0003]In the drilling and completion of wells located in bodies of water, operators find it necessary to incorporate safety measures. As those of ordinary skill in the art will readily appreciate, when wells are drilled and completed to subterranean reservoirs, the well will experience sig...

AI Technical Summary

Benefits of technology

[0008]Also disclosed is a method of operating and/or monitoring temporarily installed equipment through a tubing hanger. The tubing hanger is operatively associated with a subsea production tree. The method includes delivering hydraulic or electrical controls from a vessel through a control system umbilical, and terminating at a junction plate mated to the subsea production tree. The production tree provides internal conduits communicating controls through a series of stabs. The control of the tubing hanger and other equipment is established by landing the completion within the production tree, which has the effect of enabling the stabs and establishing communications with the completion equipment, and wherein the completion equipment is typically surface controlled sub-surface valves (SCSSV), electrical gauges and chemical injection mandrels. The method further includes reconfiguring and adding stabs which diverts controls up the assembly into the tubing hanger running tool and ultimately to other equipment. By establishing communication and control in this way, full functional control of the devices is provided. In order to maintain status of any unlatched elements of the system during disconnect activities the disconnection points will require hydraulic checking stabs, these will trap hydraulic pressure allowing the latch to reconnect and re-establish communications. This method of control requires that during the initial deployment prior to landing the tubing hanger, the oper

Problems solved by technology

As those of ordinary skill in the art will readily appreciate, when wells are drilled and completed to subterranean reservoirs, the well will experience significant pressures which require containment

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