Ok Then...

Ate you Watching that Huge blue "thing" going down ... it is from INTERMOORE. It is a Heave compensator.

From INTERMOORE:

[link to www.intermoor.com]

Subsea
RISERLESS WELL INTERVENTION SYSTEM n HEAVE COMPENSATION n CUTTING AND DECOMMISSIONING.

"We are the world leader when it comes to subsea cutting services. In addition to making our mark as the premiere severance contractor of choice, we also specialize in subsea well abandonment and offshore decommissioning.

We offer operators a wealth of advantages in the performance of wells using the latest intervention techniques and equipment. We also can help clients’ cut costs related to abandonments and heave compensation. "

WHat is a heave compensator:

- petroleum engineering) A motion compensator on a floating offshore drilling rig (boat)that moves with vertical motion to maintain a constant pressure on the drilling bit.

Vertical ship
movement (heave) provides a
third dimension to this problematical
equation. Heave compensators
reduce the effect of vertical
ship heave on the drill string and
coring tools. Without heave compensation,
optimal ocean coring
and borehole completions would
require calm seas, with large
amounts of downtime spent waiting
on weather.

WHAT THEY ARE DOING IS ABANDONING THE WELL WITHOUT THE NEED OF A RIG.
THEY ARE DOING A RIGLESS SUBSEA WELLHEAD REMOVAL

[link to www.noordhoek.net]


[link to www-odp.tamu.edu]

Now..

[link to www.epmag.com]

Less than 80%

"New system enables rigless subsea well abandonment"

A uniquely engineered vessel deployment system has completed what may be the world’s deepest rigless subsea production well abandonment.

"To carry out this abandonment operation, Helix Well Ops’ purpose-built rigless tooling technologies were employed in tandem with an onboard deployment system designed to create an over-stern moonpool work area either on a typical supply boat or for use over existing moonpools. The equipment is designed specifically to allow subsea intervention and abandonment to be conducted from readily available supply boats, rather than purpose-built intervention vessels."

Putting technology to work

After the field was decommissioned, a contract was awarded for engineering, project management, and the supply and operation of rigless abandonment tooling systems.

Rigless abandonment technology allows for the deployment of subsea equipment, guide lines, and pod lines from a monohull vessel. The system has several features that differentiate it from conventional A-frames, including the moonpool area, a heave compensation system, lifted load containment by use of cursor frames and on-deck transportation via a skidding system. The deployment system also is collapsible for in-gauge road transportation.

Rigless intervention technology also incorporates a proprietary cement injection tool designed to perforate the first casing, set a cement plug in the annulus between the first and second casings, and pressure test the plug. All three functions are achieved in a single deployment, saving considerable time and cost when compared with alternative techniques. When used with the vessel deployment system, the tools enable subsea cementing and perforation work to be performed without a rig or special intervention vessel.

Abandoning the well

Last part from :

"At this point, the wellhead was exposed, with the 95⁄8-in. casing open. Government regulations require the annulus to be plugged; so a cement plug was installed. A proprietary cement injection tool was deployed to 197 ft below the wellhead where it punched the 95⁄8-in. casing and squeezed a 131-ft (40-m) cement plug in the 95⁄8-in. to 133⁄8-in. annulus. The lower portion of the project-specific tool was left in place and secured with 131 ft of cement.

With the top hole cement plug operation complete, the crew deployed the proprietary wellhead cutter severance system and severed all of the casings in a single pass. The entire well abandonment operation was completed as programmed in eight days.

Is that enough ?