Endura® Dual-String Section Mill Provides Rock-to-Rock Cement Barrier in Offshore Well, Saves 3 Days’ Rigtime, $250,000 USD

Efficiently section mill a 170-ft window in 9-5/8 in. inner casing and a 134-ft window in 13-3/8 in. outer casing.
Establish a permanent rock-to-rock barrier adhering to industry plug and abandonment (P&A) regulations.
Minimize milling trips, reduce OPEX, and save overall rigtime.

Weatherford experts recommended the Endura dual-string section mill with next-generation milling-blade technology to enhance milling performance.
A 170-ft (52-m) window was milled in the 9-5/8 in. casing using conventional section milling technology to gain access to the 13-3/8 in. casing.
The Endura mill dressed with cut-out blades was deployed to target depth and performed a successful cut-out in the 13-3/8 in. casing, creating a 20-ft (6-m) window.
Cut-out blades were replaced with milling blades and the remainder of the window was milled, removing 114 ft (35 m) of 13-3/8 in. casing through the 9-5/8 in. casing in a single trip.

Deployment of the Endura dual-string section mill saved the operator two additional milling runs and three days of associated rigtime, equating to approximately $250,000 USD in cost savings as compared to previous operations and associated costs.
The milling of the window allowed the operator to position a rock-to-rock cement barrier ahead of their planned days and within their P&A regulations, providing certainty regarding the prevention of fluid migration between hydrocarbon and non-hydrocarbon bearing zones. This approach increased interval access while reducing risks associated with poor annular conditioning, such as cement contamination and defects like channeling and formation of micro-annuli.
Designed to drift through 9-5/8 in. casing in a retracted state and expand to mill the 13-3/8 in. outer casing, the Endura dual-string section mill eliminated all rig time associated with casing milling the entire 9-5/8 in. casing cemented to surface.

Details

Location

Offshore, UAE, Abu Dhabi

Well Type

Development, slot recovery

Hole Size

8-1/2 to 17-1/2 in.

Casing Size

9-5/8 and 13-3/8 in.

Depth

3,630 to 3,764 ft (1,106 to 1,147 m)

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Endura® Dual-String Section Mill