Rosneft drills ‘longest
well’ at Chaivo field
in the Sea of Okhotsk
Sakhalin- 1 consortium member Rosneft has
successfully completed drilling a well from
the Orlan platform at the Chaivo field in the
Sea of Okhotsk, Russia.
Stated to be the longest in the world, the
length of the well with horizontal completion
is 15,000 m with directional drilling index of
8.0 and a stepout of 14,129 m.
Sakhalin- 1 is one of the first large-scale
offshore projects in Russia that comprises
three offshore fields in Chaivo, Odoptu and
Rosneft holds 20% interest in the project,
while the remaining stake is with ExxonMobil
(30%), SODECO (30%), and ONGC Videsh
The Sakhalin- 1 extended-reach drilling
program used ‘Fast Drill’ technology that
combines high-quality modelling of physical
parameters along with a structured approach
to well design to ensure faster drilling.
Extended-reach drilling also reduces construction costs of associated offshore structures, pipelines, and other infrastructure facili-
ties. As it has a smaller drilling and production
footprint, the environmental impact is also
Chaivo is located toward the northeast
from Sakhalin at water depths between 14
m and 30 m.
The water depth in the area of the Orlan
platform was 15 m with the nearest shore
being 5 km away.
The platform was completed in July 2005
and drilling started in December that year.
It comprises minimum structures for crude
processing as all produced oil is transported
to the Chaivo onshore processing facility. The
Orlan steel and concrete structure is capable
of withstanding ice and icepacks with the
height of a six-story building.
Upper Zakum offshore
venture extended to 2051
ADNOC, ExxonMobil, and INPEX have
agreed to raise the production capacity
from the offshore Upper Zakum oil field to
1 MMb/d by 2024.
This follows ratification of an agreement to
extend the concession by a further 10 years
until Dec. 31, 2051.
Upper Zakum, discovered in 1963, is the
world’s second largest offshore oil field. Abu
Dhabi’s state oil company ADNOC initiated
development in 1977, with INPEX subsidiary
JODCO joining as a partner in 1978, followed
by Exxon in 2006.
At that point, the joint venture partners began studying options to lift production capacity
from 500,000 b/d to 750,000 b/d, eventually
settling on an artificial island-based development combined with extended-reach drilling
technology to increase recovery and minimize
They went on to construct four artificial
islands in shallow water to create what INPEX
describes as effectively an onshore environment in the offshore field.
Unlike the initial Upper Zakum development, which comprises around 450 wells and
more than 90 platforms, the islands provide
a sufficiently large footprint to accommodate
drilling rigs and to station drilling and produc-
tion equipment and personnel centrally in
offices and living quarters.
This removes costs associated with plat-
form jacket maintenance and satellites.
Future development of Upper Zakum will
continue to employ extended-reach drilling
and completion technologies to increase offshore production.
Drilling wells from the man-made islands
at Upper Zakum is said to be cheaper than in-
stalling additional offshore platforms, subsea
equipment and pipelines. In recent years, the
Upper Zakum development has set several
drilling records in the UAE, including the
longest well at 35,800 ft ( 10,912 m) measured
Future phases will make use of advanced
reser voir characterization and modeling techniques, as well as modularly expanding existing infrastructure and facilities to maximize
efficiency and lower costs.
ADES, Vantage target
ADES International Holding has entered
into a long-term joint venture (JV) agreement
with Vantage Drilling International to offer
deepwater drilling services in Egypt’s Mediterranean basin.
The agreement will allow ADES, currently
a jackup provider in the shallow-water MENA
region, to generate additional revenue without
incurring the extra capex associated with
For Vantage, the JV provides access to the
Mediterranean basin, increasing the marketability of the company’s ultra-deepwater fleet.
The JV will operate the deepwater drilling
units in Egyptian waters on a bareboat charter
agreement. Discussions are already under way
with regional operators, with ADES holding
exclusive marketing rights within Egypt.
Dr. Mohamed Farouk, CEO of ADES Inter-
national Holding, said: “This agreement exem-
plifies our asset-light model and is a natural
development of ADES’ strategy that targets
optimized cost structures across operating en-
vironments. We have a proven track record…
within our primary focus in shallow, non-harsh
environments. While this remains our core
strategy, our long-term JV with Vantage will
extend our reach into deepwater drilling while
retaining our low-cost mode.” •
Described as the world’s second-largest offshore oil field, the Upper Zakum development partners
have agreed to extend the venture to 2051. (Courtesy ExxonMobil)
Rosneft says it has successfully completed
the world’s longest extended reach well from
the Orlan platform at Chaivo field in the Sea of
Okhotsk, Russia. (Courtesy Rosneft)