SKUA Sidetrack Plans31 May 2024 15:40
Drilling development plan for skua 11 submitted to nopsema 9th May 24
htTps://info.nopsema.gov.au/environment_plans/673/show_public
attached EP Plan states..
Skua-11 ST1 Well Drilling Environment Plan
htTps://docs.nopsema.gov.au/A1085043
The existing Skua-11 subsea production well consists of primary and secondary barriers to maintain the integrity of the well. Issues with the production casing, a secondary barrier were identified in 2020 and the well was worked over in 2021. A casing patch was installed at approximately 145 m below the seabed to restore the integrity of the casing. In late 2023 a loss of pressure in the gas lift system indicated a further failure in the production casing. While the integrity of the primary barrier remains intact, activities are required to restore the integrity of the secondary barrier.
Activities will be undertaken to restore the integrity of the secondary barrier for the Skua-11 well, and to allow additional access to the Skua reservoir, via a side track of the existing Skua-11 well (termed Skua11 ST1). An overview of the activities required under this plan include the following;
Re-entry of the existing Skua-11 well
Isolation of the reservoir at Skua-11 with two barriers
Retrieval of the upper completion tubing
Permanently abandon the reservoir
Recover the subsea Xmas Tree
Cut and retrieve 9 5/8” casing (production casing)
Cut and retrieve 13 3/8” casing (surface casing)
Side track below the existing 30” conductor
Drill surface hole section to 13 3/8” casing point and run surface casing to approximately 1,700 m MD
Install high pressure riser and BOP
Drill intermediate hole section to 9 5/8” casing point and run production casing to approximately 2,900 m MD
Drill 8 ½” to well total depth (TD) at approximately 4,900 m MD
Install sand screens
Displace well to completion brine
Suspend well recover high pressure riser and BOP
Install the subsea Xmas Tree
Run upper completion
The Skua-11 ST1 well activities are scheduled to commence between Q4 of 2024 and Q2 2025 subject to MODU availability, Regulator acceptance and long lead equipment arrival. Operations are likely to last for a period of approximately 72 days in total, however timings are subject to weather and operational efficiency. Therefore, this EP validity period is from November 2024 to November 2025. Once accepted, Jadestone Energy will be permitted to undertake the activities at any time during this period.