Dual-String Section Mill

Plug and abandon
in half the time

Mill adjacent strings and achieve verifiable well integrity.

The Endura® dual-string section mill creates your preferred abandonment environment—a stable, permanent, and verifiable rock-to-rock barrier—and halves the P&A rig time average. The barrier seals across the borehole by milling both inner and outer strings and mimics natural bedding.

Set a rock-to-rock barrier and know that it’s done right

Endura

THE SUPERIOR ALTERNATIVE TO PERF, WASH, AND SQUEEZE

Fast, yet prone to channeling, squeeze jobs can lead to hydrocarbon migration and eventually a costly workover. Endura technology creates a barrier that seals across the borehole, mimics natural bedding, and reduces the risk of cement channeling.

Endura

A SURGICAL APPROACH TO P&A

Rather than removing thousands of feet of dual-string casing, Endura technology mills through select 100-ft-long sections of both 9 5/8- and 13 3/8-in. casing strings.

Endura

VERIFIABLE WELL INTEGRITY

The tool leaves the wellbore exposed to the bedrock, which sets the stage for a rock-to-rock, cement-to-formation bond that can be verified by a pressure test and significantly reduces the chances of future workovers due to hydrocarbon migration.

Expose more of the rock face, faster

Cutting-edge blades

Based on RipTide® drilling reamer technology, the mill features separate stabilizers and specially designed 4.5- to 13-in.-long carbide cutting structures that enable through-casing milling of the adjacent casing string. The inserts cut radially and axially downward to improve milling and create finer, more manageable cuttings.

See the specifications for the Endura mill

Blades

Reduce milling time by half

The ideal cement-to-formation bond

To plug and abandon a typical offshore well, the technology mills through the 9 5/8-in. casing like any other section mill. The difference lies in trips dedicated to the outer string. The Endura dual-string section mill passes through the restricted ID of the 9 5/8-in. casing string to the open section.

Hydraulic stabilizers expand inside the 13 3/8-in. outer casing to centralize the tool. The full-gauge cut-out blades remove approximately 15 ft of casing to prepare for milling. Using advanced cutting technologies that improve swarf-handling and reduce birdnesting, the mills engage and then mill through the remaining section of outer casing.

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Cement to Formation Bond

Our client saved 5 days of rig time and reduced overall risk

Field-proven results

One operator faced top-up cement in the annulus between the 9 5/8- and 13 3/8-in. casing strings in an offshore gas well and could not cut and pull casing as planned. Weatherford deployed the Endura dual-string section mill and safely exposed a 98-ft section of formation. The operation not only provided a verifiable rock-to-rock barrier, but also saved the customer 5 days of rig time.

Read how Endura saved $1.88 million in rig time

Raptor

Watch the Endura dual-string section mill at work

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Submit Your Questions on Setting a Rock-to-Rock Barrier

Our technology delivers the best barrier in the business: a rock-to-rock hydraulic seal across the borehole that mimics natural bedding, mitigates gas migration, eliminates channeling, and can be verified with a pressure test. To learn how our services and technologies can work for you, please complete the contact form and one of our technology experts will be in touch.