System and method for depth measurement and correction during subsea intrevention operations
AssigneeSchlumberger Technology Corporation
InventorANDREA SBORDONE
Life of this patent
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Abstract
A technique enables determination of changes in length of a conveyance deployed between a surface vessel and a subsea installation. The technique allows information to be obtained on the relationship between length of conveyance spooled out or spooled in at a surface location and the depth and/or speed of an intervention well tool deployed in a well. The information can be used to determine the actual depth of the well tool deployed in the well for the intervention operation.
Claims27
A system for accurately determining the depth of a tool in a well during an intervention operation, comprising:
- a conveyance deployed into a subsea installation;
- a subsea measurement system located proximate the subsea installation, the subsea measurement system cooperating with the conveyance to determine a parameter of the conveyance;
- a surface measurement system cooperating with the conveyance to determine the parameter of the conveyance at a surface location;
- a system to receive output from the subsea measurement system and the surface measurement system to process the parameter.
A method, comprising:
- deploying a well tool to a subsea well via conveyance;
- using a subsea measurement system to track deployment of the conveyance;
- using a surface measurement system to track deployment of the conveyance at the surface;
- and
- processing output from the subsea measurement system and the surface measurement system to determine discrepancies.
A method, comprising:
- deploying a tool string into a subsea well;
- and
- using a subsea measurement system to determine an actual parameter of the tool string in the subsea well.
A system, comprising:
- a subsea measurement system positioned at a subsea installation to detect deployment of a tool string into a subsea well via a conveyance;
- and
- a controller to receive signals output from the subsea measurement system, wherein the controller compares data from the subsea measurement system to surface data related to deployment of the conveyance from a surface location.
Dependencies are inferred from the claim text.