Mumbai High
Facility Name Cluster-7 FPSO Duty Oil/Gas
Operator ONGC (NOC) Current Status Under Construction since 2013
Host Type FPSO Water Depth 85 m / 281 ft
Dev.Cost n/a Region India
Location BH-DS

Facility Name Mumbai High Complex Duty Oil
Operator ONGC (NOC) Current Status Producing since 1976
Host Type Fixed Platform Water Depth 61 m / 201 ft
Dev.Cost n/a Region India

Facility Name Mumbai High North Complex Duty Oil/Gas
Operator ONGC (NOC) Current Status Under Construction since 2014
Host Type Fixed Platform Water Depth 60 m / 198 ft
Dev.Cost n/a Region India
Location North Block
Field Name Mumbai High Discovery Date Jan 1974
Block North and South Blocks Reserve Type Oil
Producing - Under Dev. Production Start Jan 1976
Water Depth 61 m / 201 ft

Field Name Cluster-7 Discovery Date
Block BH-DA Reserve Type n/a
Under Development Production Start
Water Depth 85 m / 281 ft

Field Name Mumbai High North Discovery Date
Block North Block Reserve Type Oil/Gas
Under Development Production Start
Water Depth 60 m / 198 ft
Situated in a water depth of 200 feet (61 meters), the Mumbai High field is located in the Arabian Sea 99 miles (160 kilometers) west of India's Mumbai coast, and spans 47 miles (75 kilometers) long and 16 miles (25 kilometers) wide. The massive oil and gas field is considered to be the most important oil field in the country as it contributes roughly 65% of the indigenous crude oil production. The state-run Oil & Natural Gas Corporation (ONGC) wholly owns and operates Mumbai.

In 1974, a Russian and Indian oil exploration team operating from the seismic exploration vessel Academic Akhangelsky discovered Mumbai during mapping for the Gulf of Cambay. The oil field consists of two blocks named Mumbai High North (MHN) and Mumbai High South (MHS), which were divided because of independent exploitation of reserves at the north and south fields of Mumbai High. The field is exploited using the gas lifts method, a major artificial lift method used for oil production. Several gas compressors are located throughout the field to support the broad gas lift network.

The field currently produces at a rate of 245 Mbopd and has produced 24% of the initial-oil-in-place cumulatively.

Field Development

ONGC announced its plan for Mumbai High redevelopment in 2000 to help stop the field's declining status and to increase the field's production rates. The redevelopment project consists of two phases; the first phase started in 2000 and was completed in December 2006. During this time, a multi-purpose support vessel collided with the Mumbai High North (MHN) platform, severing a gas riser and causing a massive fire, which destroyed the MHN platform within two hours.

The Mumbai High North (MHN) platform was a 7-story steel structure that processed oil and natural gas that had a production capacity of 80 Mbopd. The MHN platform had five gas export risers and 10 fluid import risers situated outside the platform jacket.

The platform was connected to an unmanned NA small drilling platform, the MHF residential quarters platform, the MSV platform and the MHW processing platform, all linked by bridges. The Mumbai complex also imported fluid from 11 satellite wellhead platforms and exported oil to shore via subsea pipelines. The fire also harmed the MSV platform, which was towed away from its location to be repaired onshore but then sank about 11 miles (18 kilometers) from the Mumbai coast.

Because of this, the operator decided to construct a new process complex during the first phase of redevelopment on the Mumbai field. The new process complex was constructed to handle 255,000 barrels per day of liquid including 48,000 bopd and 7 MMcf/d. The process complex will consist of a process-cum-riser platform (MNP), a living quarters platform, a subsea connected flare structure (MNF), subsea pipelines and associated topside modifications including facilities for handling sour gas from nearby marginal fields. On February 1, 2007, the operator received governmental approval to construct the complex.

In July 2006, J. Ray McDermott was awarded a contract for the installation of four wellhead platforms, three connecting bridges, and two subsea pipelines for the MHB complex. Installed in a water depth of 200 feet (61 meters), the new complex should be complete by 2010.

L&T secured a $1.18 billion contract from ONGC during August 2009. The contract included an order for the MHN processing platform and living quarter projects, along with additional orders for the supply of three process gas compression modules to be installed in the MHN complex. The three compression modules constitute a total of 80,000 metric tons of structures. The scope of work included surveying, engineering, procurement, fabrication, installation and commissioning of the facilities by L&T.

Aker Kvaerner Group was awarded a subcontract by Hyundai Heavy Industries to engineer submarine pipelines and ancillary systems for the field. The subsea design project included two main trunk lines bringing oil and gas from the MNW platform to the landfall point at Mumbai Uran Terminal; the trunk lines are joined by several feeder lines connected to other platforms along the route to shore. The system included 8 new risers, 9 I-tubes, 22 subsea laterals, 1 subsea tie in and 9 subsea intervention valves.

Phase I of the project enhanced the efficiency and controlled the decline in oil and gas production, improving the field's reserves by 29%. Phase I of the project is expected to yield an additional crude oil production rate of 23.25 MMT and 6 BCM of gas by 2030, from 73 new wells and 10 side-track wells.

To facilitate interconnectivity of the power generating system, an installation of high voltage submarine composite electrical cable was initiated in 2007. The installation should be completed by March 2012.
ONGC also approved the construction of 7 pipelines with risers and associated topside facilities in Mumbai High North in April 2007.

These pipelines are vital for optimum utilization from Mumbai High and the work should be completed by April 2010.

Phase II

Phase II redevelopment, announced in 2009, hopes to further enhance recovery rates from Mumbai High by focusing on drilling 73 new wells and side-tracking 38 poor producers. The second phase of Mumbai High North should be completed by September 2012.

ONGC Issues Construction Contract for Mumbai High North Facilities
Date: Sep. 2014
Type: Facility Construction
ONGC issued a contract to L&T Hydrocarbon Engineering Limited to provide engineering, procurement, construction and installation of 5 wellhead platforms at Mumbai High North off India's west coast. The $222.4 million contract is scheduled for completion in 1Q 2016. Development of Mumbai High North is part of ONGC's push to increase oil and gas output at the field through 2030. In all, ONGC plans to spend $947.6 million on new surface facilities, development drilling and workover operations.
Sigma Offshore Awarded Cluster-7 FPSO Contract
Date: Sep. 2013
Type: Contract Award
Sigma Offshore was awarded a contract to provide engineering support to Bumi Armada for a $62.2 million FPSO turret mooring system to be used at ONGC's Cluster-7 development in the Mumbai High area off India's west coast. The FPSO is currently under construction and is due to be delivered in November 2014.
SP Armada to Operate Cluster-7 FPSO
Date: Feb. 2013
Type: Contract Award
SP Armada Oil Exploration, a jointly controlled entity of Bumi Armada, announced an FPSO charter contract award worth $740 million from Cluster-7 field owner ONGC. SP Armada will own and operate the vessel in the Cluster-7 field off the coast of Mumbai, India with delivery to take place 21 months after contract award. The vessel will have a minimum storage capacity of 510,000 barrels and will be equipped with oil production and stabilization, water injection and gas compression/dehydration equipment. A $340 million optional extension period is included in the contract.
Commissioning Close for Mumbai High North Platform
Date: Nov. 2012
Type: Facility Construction
Construction of the new Mumbai High North platform is near completion. The original structure was destroyed in a fire in 2005 and the new platform and associated facilities are part of the re-development project. Larsen & Toubro was awarded a $1.18 billion engineering, procurement, construction and installation contract in 2009 by ONGC for a processing platform, living quarters and gas compression modules. It is anticipated that the new construction will be brought online early 2013.
McDermott Clinches EPCI Project for Mumbai High
Date: Nov. 2011
Type: Contract Award
Oil and National Gas Corporation has granted McDermott's subsidiary an engineering, procurement, construction and installation (EPCI) project for the Cluster 7 Development Program. The EPCI project includes five wellhead platforms in the Mumbai High field. Offshore mobilization will commence in late 2012. Situated in a water depth of 200 feet (61 meters), the Mumbai High field is located in the Arabian Sea, 99 miles (160 kilometers) west of India's Mumbai coast.
New Leighton Eclipse Pipe-Lay Barge Commences Operations
Date: Nov. 2009
Type: Status Update
Leighton's barge, Leighton Eclipse, arrived at the Mumbai High field on Nov. 5, 2009 to lay pipelines and install risers for the Pipeline Replacement Project through April 2010. The vessel will install a 12 mile (20 kilometer), 16-inch-diameter lay in 246 feet (75 meters) of water. Situated in a water depth of 200 feet (61 meters), the Mumbai High field is located in the Arabian Sea 99 miles (160 kilometers) west of India's Mumbai coast.
Status History
Mumbai High North

Under Development - Sep 2014 to -
Mumbai High North Complex

Under Construction - Sep 2014 to -

Under Development - 2013 to -
Cluster-7 FPSO

Under Construction - Feb 2013 to -
Mumbai High Complex

Producing - 1976 to -
Mumbai High

Producing - Under Dev. - 2000 to -
Producing - 1976 to Dec 1999
Discovery (Drilled) - 1974 to Dec 1975
Project Map Asia - South
Line Separator
Project Image
Mumbai High North
Mumbai High Field
Mumbai High - India
Mumbai High - India