US 12,540,544 B2 · System and process for subsea fiberoptic logging of a well

Abstract

A system and process for subsea fiberoptic logging of a well has a subsea structure having a central bore, an upper valve positioned in the central bore, a lower valve positioned on the central bore below the upper valve, and a subsea probe releasably connected to an upper connector of the subsea structure. The subsea structure has at least one channel adapted to connect to a downline. The upper valve is movable between an open position and a closed position. The lower valve is movable between an open position at a lower position. The channel opens to the central bore in an area between the upper valve and a lower valve. The subsea probe has a fiberoptic line connected thereto. The fiberoptic line is adapted to extend to a portion of the central bore of the subsea structure and into the well so as to sense parameters within the well.

Claims30

Dependent claims

A system for sensing in a subsea well, the system comprising:

a subsea structure mounted in communication with the subsea well, the subsea structure defining a bore and defining at least one flow channel, the bore defined through the subsea structure and communicating with the subsea well, the at least one flow channel configured to connect at least one downline to a channel area in the bore, the subsea structure comprising a first valve and a second valve;
and
a subsea probe mounted in communication with the bore of the subsea structure and including a fiberoptic line, the fiberoptic line being deployable from the subsea probe through the bore of the subsea structure and into the subsea well and being configured to conduct optical signals for sensing data associated with the subsea well,
wherein the first valve is positioned in the bore between the subsea probe and the channel area and is operable between open and closed conditions;
and
wherein the second valve is positioned in the bore between the channel area and the subsea well and is operable between open and closed conditions separately from the first valve.

3 more elements

A process for sensing in a subsea well, the process comprising:

mounting a subsea structure in communication with the subsea well, the subsea structure including a subsea probe and defining a bore and first and second flow channels, the subsea probe having a deployable fiberoptic line, the bore defined through the subsea structure and communicating the subsea probe with the subsea well, the first and second flow channels communicating with a channel area in the bore;
connecting first and second downlines respectively to the first and second flow channels;
releasably connecting a second connector on the subsea probe with a releasable connection to a first connector on the subsea structure, the bore being in communication with the first connector of the subsea structure;
before releasing the deployable fiberoptic line from the subsea probe, pressure testing the releasable connection of the second connector to the first connector by:
closing a first control valve on the first flow channel connected to the first downline;
opening a second control valve on the second flow channel connected to the second downline;
delivering fluid from the second downline to the channel area of the bore via the second flow channel;
preventing the delivered fluid in the bore from passing to the subsea well;
and
communicating the delivered fluid in the bore through a lubricator line communicating a first location in the bore between the first connector and the channel area with a second location in the first flow channel upbore of the first control valve;
releasing the deployable fiberoptic line from the subsea probe to pass through the bore and into the subsea well;
and
acquiring data associated with the subsea well by conducting optical signals through the deployable fiberoptic line deployed in the subsea well.

10 more elements

Dependencies are inferred from the claim text.

System and process for subsea fiberoptic logging of a well

Life of this patent

System and process for subsea fiberoptic logging of a well

Life of this patent

Abstract

Claims30