InterMoor, an Acteon company, has completed an installation and recovery project for Apache Deepwater LLC (Apache) in Mississippi Canyon Block 148, Well 5 in the Gulf of Mexico.
The work scope included the overboard, wet transfer, deployment and recovery of a 30-ton interchangeable riserless intervention system (IRIS) owned by Blue Ocean Technologies. InterMoor undertook the work in water approximately 168 meters deep from Cal Dive’s Uncle John semisubmersible vessel.
InterMoor delivered the project using its compensated anchor handler subsea installation system (CASIM) which reduces heave motions relative to vessel motions. CASIM units are pre-charged at the surface to deliver the needed heave compensation for the load at depth. InterMoor’s proprietary CASIM method requires less deck space and demands fewer deck operations than the traditional buoy-based heave-compensated landing system. The company also provided the associated rigging equipment and a technician to help facilitate the subsea compensation.
“Apache selected InterMoor for this project on the basis of our service record, the fact that we had the necessary equipment available and because of our experience in subsea operations of this kind,” said InterMoor project manager Jacob Heikes. “Although we have used CASIM to deploy and recover many types of subsea equipment, this is the first time that we have used CASIM for IRIS deployment and recovery, and the project’s success shows that this proven installation method is suitable for a wide range of subsea equipment.”
Statoil has awarded contracts for new light well intervention (LWI) vessels. These “category A” units will contribute to increased recovery from Statoil’s approximately 500 operated subsea wells on the Norwegian continental shelf (NCS).
Statoil has on behalf of relevant licensees awarded a contract to Island Offshore Management and Eide Marine Services for the charter of a total of three LWI vessels.
These purpose-built vessels are used for performing light well interventions, well operations and well maintenance without a riser-based system. Statoil can reduce well intervention costs by about 60% by utilizing a LWI vessel instead of a conventional rig.
“Performing these types of conventional jobs on subsea wells with low volumes of oil in place is expensive. The LWI vessels ensure both cost-efficient and safe operations,” says Statoil’s head of drilling and well Øystein Arvid Håland.
“Having more and new vessels of this category also helps increase recovery from fields on stream by opening new zones in the well, and stopping water production downhole.”
The contracts are worth a total of NOK 9.4 billion (USD 1.57 billion).
Island Offshore vessels Island Frontier and Island Wellserver, which already have contracts with Statoil, have been awarded new five-year contracts. Eide Well Intervention, a new supplier in this segment for Statoil, has been awarded an eight-year contract for their new build, which employs a completely new technology.
The contracts with both companies come into effect in the spring of 2015, and include two options to extend for another two years.
A growing number of discoveries are developed via subsea wells, and it is important both to have equipment capable of maintaining these and to avoid using conventional drilling rigs for this type of work.
The rig market on the NCS is characterized by an aging rig fleet, and it is necessary to ensure sufficient and adequate rig capacity at sustainable rates. To address this, Statoil has put light LWI vessels – category A units – into service on a large scale.
“We have great ambitions and a long-term perspective on the NCS. Using purpose-built rigs and vessels in our operations is an important part of Statoil’s rig strategy. The high number of subsea wells in the future will require maintenance, and we are securing capacity in order to meet this need,” says Statoil’s chief procurement officer Jon Arnt Jacobsen.
“Island Offshore has delivered solid services and we expect the same going forward. At the same time we are pleased to have increased the number of suppliers in this market, and through the Eide Well Intervention newbuild we are also employing the latest available technology. Together these three vessels will provide us with an efficient service fleet for light well intervention services.”
Statoil has been pursuing riserless well intervention in subsea wells since 2000, and the technology has steadily improved.
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