Leverett

Leverett Conventional Oil Field Profile

Location and Geographical Details

• The Leverett conventional oil field is located in the UK, specifically within block 21/3d ALL, in shallow water. It is approximately 146 km east of the northeast coastline of Scotland.

Water Depth and Seabed Conditions

• The field is situated in an area with a water depth of around 478 feet.

Ownership and Operation

• The Leverett oil field is owned by Delek Group, Harbour Energy, and Neo Energy Group. The project is operated by Neo Energy Petroleum.

Project Status and Timeline

• The project is currently in the construction stage, with the final investment decision (FID) approved in 2022. Commercial production is expected to start in 2024, and production is forecast to peak in 2025. Based on economic assumptions, the field is expected to continue producing until it reaches its economic limit in 2118.

Drilling and Well Details

• The development involves the drilling of approximately four wells. The drilling operations include the use of the Paul B. Loyd Jr. anchored, semi-submersible drilling rig. The main well will be drilled in three sections (36", 17.5", and 12.25") with potential sidetracks. The drilling process is estimated to take up to 170 days, with the rig on location between May 4, 2023, and December 31, 2023.

Well Completion and Testing

• After drilling, the well will be completed with conductor casings and a 7" production liner cemented in place. The well will undergo cleanup by circulating fluid pills to remove residual drilling fluids, followed by a viscosified push pill and inhibited filtered brine. The well will then be perforated and subjected to a well test, which includes six separate flow periods ranging from 2 to 12 hours. Hydrocarbons from the well test will be flared over 36 hours. Post-testing, the well will be killed by bull-heading brine and then plugged and abandoned according to Oil and Gas UK guidelines.

Environmental Considerations

• The project has undergone environmental impact assessments, considering the environmental sensitivity of the geographical area. The assessments include preliminary verifications and conditions attached to the consent for the project. The project's environmental impact is managed through strict protocols, including the disposal of water and hydrocarbons in compliance with regulatory limits (e.g., oil in water content <30 mg/l).

Subsea Infrastructure

• The development includes the installation of subsea trees as part of the field's infrastructure.

Production and Reservoir Characteristics

• The Leverett field targets condensate and gas, in addition to oil. The production profile indicates that the field will produce until it reaches its economic limit in 2118. The reservoir characteristics and production forecasts are based on detailed analysis and modeling, which may include methods such as those described by the Buckley-Leverett theory for two-phase immiscible fluid flow.

In summary, the Leverett conventional oil field is a significant development in the UK's offshore oil and gas sector, with a long-term production outlook and rigorous environmental and operational protocols in place.