Blog Archives

Halliburton Charters Island Captain for UK Operation

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Norway’s Island Offshore reports that Halliburton has chartered the Company’s Island Captain as a well stimulation vessel on a 2 months firm contract.

The vessel will be operating on the Clipper South field in the Southern North Sea. The Island Captain is with this joining Island Commander and Island Patriot as the 3rd well stimulation vessel from IO, with a 4th vessel going into operation in January 2013.

“We are very happy to have made this deal with Halliburton and feel confident that the vessel will perform to the charterers’ expectations,” reads Island Offshore’s statement.

The Island Offshore Group is currently operating a fleet of 17 vessels ranging from Platform Supply vessels, Anchor Handling Vessels, Subsea Construction Vessels to Light Well Intervention Vessels. The group has several vessels under construction.

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Murphy Oil Malaysia Completes Rigless Intervention Campaign Using Welltec Services

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Murphy Oil Malaysia recently completed a highly successful, rigless intervention campaign using Welltec services. Not only did the operation allow immediate production from a “lost” well, but it also saved the time and cost of a rig based sidetrack. The end result is expected to add 20 MMscf/d into the production portfolio.

In the first well, the drift run hung up at 945 ft MD when trying to perforate the well. Based on previous experience, the cause was suspected to be part of a cement wiper plug. This was pushed down to a nipple profile at 4,314 ft MD, leaving it still 1,690 ft above the perforation depth. After only minutes of milling, the Well Miller made it through the plug, which allowed the Well Tractor® to push it down to 6,398 ft MD, approximately 380 ft below the target perforation interval. Thereafter the well was perforated and put on production.

In the second well, a poor cement job had made the primary target zone inaccessible and left an obstruction inside the tubing. With pressing rig commitments there was insufficient time to fix the problem, leaving the well temporarily abandoned and a candidate for future sidetracking. Based on the success of the first well, the Well Tractor and Well Miller were used to push the obstruction from 400 ft to 2,132 ft MD , meeting the objective to prepare the well for sidetracking.

However, it was decided to attempt to push the obstruction as far as possible. Using the Well Tractor and Well Miller the well was cleared well beyond the sidetrack target depth to an eventual Hold Up Depth of 8,743 ft MD. Getting this far down the production string allowed access to two of the three reservoirs in this well, which could now be completed for production rather than scheduled for a sidetrack workover.

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LWI Vessels: Important Tool for Increasing Recovery

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Statoil is cutting the costs of increased recovery from fields in operation by hiring in light well intervention vessels. As of December Statoil has three light well intervention vessels in operation.

Statoil awarded Island Offshore a framework agreement earlier this year for light well intervention (LWI) services from their Island Constructor vessel.  The new vessel is set for operation in December, and is Statoil’s third light well intervention vessel in operation on the Norwegian continental shelf (NCS).

Light well intervention vessels – known as cat A – are an important tool to increase recovery from the fields on which Statoil operates.

Compared with conventional drilling units, these LWI vessels reduce the cost of well interventions substantially. Reduced well intervention costs also helps increase the number of interventions.

“Performing conventional jobs of this kind for subsea developments in areas with low volumes of oil in place has been expensive,” says Statoil drilling and well technology operations manager Øyvin Jensen.

“To address this, Statoil has put LWI vessels into service on a large scale. This is of high value to us, both in terms of efficiency and cost reduction.”

Light well intervention vessels are an important tool in Statoil’s toolbox to increase field recovery. A growing number of discoveries are developed via subsea installations. At the same time, production from mature fields is declining.

Wells need workover in order to maintain their output. These have historically been expensive operations on subsea developments.

Utilising light well intervention vessels contributes to a more cost-effective maintenance of subsea wells, improves drilling efficiency, and provides the potential to offset rig capacity.

Statoil has pursued riserless wirelining in subsea wells since 2000, and the technology has steadily improved.

Statoil issued a new tender for light well intervention vessels this autumn. The invitation to tender was issued in October, and the bids are due in December this year.

“We already have three light well intervention vessels in our portfolio. The new tender process will cover our needs for light intervention services when the existing vessels come off contract,” says Statoil vice president for drilling and well procurement Terje Rognan.

“We are tendering for a minimum of two such vessels and are open for long-term commitments. With 487 subsea wells on the NCS, it is evident that this is an important market segment for Statoil going forward and subsequently of high interest for the supplier industry and shipowners.”

Facts

  • Light well intervention vessels are connected to a well with the aid of a toolbox lowered to the seabed
  • The vessels can carry out logging and wireline operations, but not drill
  • During LWI, downhole equipment is remotely operated via a wireline from the surface and – unlike rigs – without a riser.
  • Currently three LWI vessels – Island Wellserver, Island Frontier and Island Constructor – have been contracted by Statoil on the NCS.

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Well Enhancer en route to Africa for region’s first LWI project

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The Well Enhancer is making her African debut this winter to complete the region’s first ever Light Well Intervention (LWI) campaign offshore Equatorial Guinea.

The campaign will include another first for the Well Enhancer as she will be undertaking her deepest project to date at approximately 1,540 ft (470 m) water depth. The Well Enhancer’s current specification allows her to work in water depths of up to 1,970 ft (600 m).

The Well Enhancer’s arrival represents the emergence of the LWI market for a region which is experiencing rapid development.

The Well Enhancer’s strong track record and Well Ops UK’s reputation as a market leader in providing subsea well intervention services in the North Sea was key in obtaining the award for the African project. This is because Well Ops North Sea clients also own significant interests offshore West Africa and key personnel already understand the methodology and technology behind riserless well intervention operations.

The campaign will include remedial workscopes on six wells by way of a subsea tree replacement, production enhancement, well maintenance and well integrity work.

The Well Enhancer, launched in 2008, provides oil and gas production companies the opportunity to undertake a multitude of workscopes across a number of wells in various locations with the ability to transit between wells and gain access to a well via a Subsea Intervention Lubricator (SIL) well control package to intervene.

This method is both a much quicker and less expensive option to the conventional approach of using a drilling rig. Using LWI vessels also frees up drilling rigs to undertake the operator’s drilling, completion and well work-over projects.

The Well Enhancer, as with sister vessel Seawell, can also provide the operator with up to an 18-man saturation diving system rated for 984 ft (300 m). This offers clients increased options and flexibility when undertaking well work and can support light construction and inspection, repair and maintenance projects within the field, thus maximizing the capabilities of the assets.

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