Valhall Redevelopment Project
More great news for Aker BP as their Aker BP Valhall Redevelopment Project which is a gigantic oilfield in the southern Norwegian sector of the North Sea has significant oil which is welcome news in the current climate.
Original production started in 1982, and following on from commissioning of a brand new PH platform in 2013 the oil field currently has the potential to carry on manufacturing for many more years if not many more decades which is great news for Aker BP who seem to be leading the way in Norwegian Oil & Gas.
From May to October 2015 a comprehensive surface prep work and paint work was carried out on Valhall field center and flank platforms.
The prep work additionally involved structural repair and maintenance on the more mature platforms that will definitely be taken off in the next few years on the injection platform.
Valhall Redevelopment Facility
The Valhall facility comprises today of six individual steel platforms for drilling, wellheads, production, water injection, combined process- and accommodation platform respectively.
These particular platforms are bridge-connected. Additionally the field has two unmanned flank platforms, one in the south and one in the north, both around 6 kilometers from the oil field.
A cutting edge automated drilling rig which through a fiber optic line is connected into an onshore Operations Center in Stavanger, the IP drilling rig has already been carried out a programme of infill drilling and workovers.
- New facility design life: 40 years.
- Accommodation: 180 single bed cabins.
- Oil production capacity: 120,000 bpd.
- Gas handling capacity: 143 mmscf/d.
- Topsides (dry) weight: 18,500 tonnes.
- Jacket substructure: 8,400 tonnes.
- Power from shore: 294 km direct-current cable from southern Norway.
The platform arrangement enables drilling and maintenance of wells on the new platform (24 wells total) and on the existing WP platform (19 wells total). To this day 8 water injection wells have been drilled from IP.
The wellhead platform and the consolidated production and accommodation platform. In 2015 the supporting work following the completion of the Valhall re- development project was achieved, this helps make Valhall operate with a closed flare throughout typical operation.
Valhall Drilling and Water Injection Platform
Since start up began, 13 wells have been plugged and completed ahead of schedule according to August 2016. A total of 31 wells will be permanently plugged. The scope of work was initially determined to take 10 years, nevertheless, if the positive progress carries on, it is actually feasible to accomplish the work a number of years ahead of schedule.
A few other essential facts pertaining to the new combined production and hotel platform:
IP is a fixed steel platform, bridge connected to the current Valhall wellhead platform. The platform was set up in 2003 and the first water injection occurred January 2004.
It has integrated topsides with water injection facilities, seawater treatment properties and a platform -based drilling rig, which in turn can easily skid on beams from IP to WP.
The platform possesses brand new pipeline (subsea) crossovers to and from the new PH platform. It is powered from shore via a 78 mw power cable from Lista. The platform has a built in operating environment linking onshore and offshore workers.
The Drilling Platform (DP) plug and abandonment of wells.
Both are two exactly the same unmanned wellhead platforms each equipped with 16 drilling slots and situated about 6 km (one to the North and one to the South) from the current Valhall Facilities where well streams are processed.
Valhall is also the owner of the 2/4 G-platform installed in 1982, situated at Ekofisk and managed by Conocophillips. The platform was removed from service as part of Ekofisk II in 1998. Both the removal and impact evaluation plan was authorized by the Ministry of Petroleum and Energy in December 2015
The South Flank started production 8th May 2003. While the North Flank came on stream 7th January 2004.
Constructed in 1979 and put in service in July 1981. It has lodgings for 208 individuals but because of subsidence and air gap demands between cellar deck and sea level only maximum 177 persons are permitted to be accommodated. In the course of periods of severe weather the manning level on QP are even more regulated according to procedures agreed with the authorities.
Valhall Production and Accommodation Platform
Valhall is an oil field situated in 70 metres of water. The field was originally established with three facilities, however, has now 8 platforms.
The Wellhead Platform (WP) Installed in April 1996 and very first oil production commenced in June the same year. WP has 19 well slots.
QP shall be shut for the winter months: 1st November 2015 until 31st March 2016 and from 1st November 2016 until 31st March 2017. The QP installment will be completely shut in during 3Q 2017 at the latest.
The oil is transported through a pipeline via Ekofisk to Teesside. The gas is routed via the Norpipe pipeline to Emden.
The new Process/Hotel Platform (PH) is placed on a 108m high fixed steel jacket and attached to the other installations via an external system of bridges and walkways. It consists of all essential utilities/process piping, linking PH to the existing complex.
Valhall Crestal Gas Lift Project has been accomplished and a total of 9 wells can generate with additional assistance from gas lift which enhances the production from Valhall. The project involved considerable alterations to both IP and WP to commence gas injection and enhance recovery from the central area of the reservoir.
The Valhall Flank Platforms
The drilling pause on the injection platform which started in 1 Q 2015 is anticipated to go on until end 2016 and recertification of the drilling unit will certainly be completed June/July 2016.
Located between QP and PCP. It has 30 well slots, waste injection and a drilling rig. The platform began its activity on 17 December 1981, during that time with the first covered derrick. The derrick and drilling foundation were taken out during summer 2009. A separate program for plug and abandonment began during 2014 using the Maersk Reacher HDJU.
Valhall Drilling Programme
The Flank drilling programme using the Maersk Reacher HDJU was completed around mid year 2014 and the rig moved to DP to commence well plugging and abandonment activities. During 2014 the Valhall Flank gas lift project was completed and this help to reduce the rate of production decline from the flank wells.
Water injection is essential for extraction of oil from Valhall. The supply of water adds to uphold the pressure in the reservoir therefore keep steady production from the chalk field. Technical evaluations of the system and change out of machinery have led to stable water injection at Valhall.
The drilling rig left Valhall in August 2016 and should be switched out by the new Maersk XLE 4 rig in the second quarter of 2017 to continue the work. Aker BP are certainly one of the main oil and gas companies to watch out for in the future.
A special thanks to Aker BP for the update it is great to see such a positive company doing so well in the current climate, Aker BP have slick systems in place and an energy drive to become one of the main oil and gas companies in the world. If you want to learn more about Aker BP, visit their website direct at Aker BP