Introduction

OML 133 is located in the western part of the Niger Delta, approximately 100 kilometres offshore. The block contains three deepwater oil fields: Erha, Erha North and Bosi.

The Erha deepwater development, including the Erha field and Erha North satellite field, was completed in 2006.

Erha field and Erha North field Development

The fields are located approximately 97km offshore Nigeria, in water depths ranging from 1,000m to 1,200m. They were developed with an investment of $3.5bn.

Production from the main field started in April 2006, while production from the satellite field started in the third quarter of 2006. The production capacity from the development prior to the expansion was 140,000 barrels a day.

The Erha North Phase II development project, an extension of the existing Erha North subsea system and infrastructure was completed in September 2015, five months ahead of schedule. The final investment decision for the project was made in early 2013.

The project involved the further development of Erha North field by drilling wells from a new drilling centre, installation of associated subsea facilities, and modifications to the existing floating production, storage and offloading (FPSO) unit. The development aims to target a peak production rate of 65,000 barrels of oil per day (bopd) from the satellite field.

The Erha deepwater development was the first deepwater offshore fieldin Nigeria. Three drill centres, comprised of 30 subsea wells, are tied back to the Erha FPSO vessel.

The drill centre east (DCE) and drill centre west (DCW) are located 1.5km from the FPSO, while the drill centre north (DCN) is located eight kilometres from the two drill centres and is tied back to DCE.

Processed oil from the project is stored in the FPSO and conveyed to offloading tankers via two 22in diameter offloading lines and a catenary anchor leg mooring (CALM) offloading buoy.

Bosi field development

The Bosi development is planned as a spread-moored floating production unit vessel with associated subsea developments that utilizes the Erha FPSO vessel for oil storage and offloading. The Bosi Phase 1 project is expected to develop more than 600 million barrels of oil. 

Operator

Shell (Nigeria): 56.25%

ExxonMobil (Nigeria): 43.75%