In today’s low global oil price environment, maintaining wells in operable condition while minimizing repair costs has become a critical economic priority for operators.

RML has long provided proven technical solutions to address well integrity challenges in 7-inch (177.8 mm) and 9 5/8-inch (244.5 mm) casing strings. These systems have demonstrated reliable performance in wells with high temperatures and elevated hydrogen sulfide (H₂S) content, delivering consistent results in demanding operating conditions.

New Solution Developed for 6 5/8-Inch Casing

At the request of a new partner, RML expanded its technology portfolio to address casing integrity issues in 6 5/8-inch (168.3 mm) casing strings. Bench testing of the new sealing elements was conducted in late 2025.

A key consideration during development was the operating profile of the customer’s wells, which are characterized by low temperatures and a high gas factor. To optimize overall repair costs, RML intentionally moved away from high-cost, high-temperature sealing materials and instead focused on materials better suited to these specific conditions.

Testing, Optimization, and Validation

Initial testing identified areas requiring refinement, including material re-selection and optimization of the setting mechanism angles. Following these adjustments, subsequent tests confirmed:

  • Full and consistent expansion of the sealing elements

  • Stable mechanical performance

  • Successful pressure testing, validating reliable sealing capability

These results confirmed the readiness of the solution for field application.

Availability Starting in 2026

As a result of this development program, beginning in 2026, RML will offer both Surface Casing Patch and Casing Patch solutions for the following casing sizes:

  • 6 5/8-inch (168.3 mm)

  • 7-inch (177.8 mm)

  • 9 5/8-inch (244.5 mm)

This expanded offering will be available to both new and existing customers, providing cost-effective, field-proven options for addressing casing integrity challenges across a wider range of well designs.