Halliburton Prolongs Well Life, Productivity with New Cementing Service
Halliburton has announced the delivery of WellLife III cementing service, a comprehensive solution designed to increase the economic life of wells. The solution incorporates three synergistic components: diagnostics tools, engineered cement systems, and zonal isolation assurance tool.
With this new service Halliburton continues to evolve the cementing operation beyond the conventional cement-design method that predominantly focuses on well-construction activities. This service is an interventionless react-and-respond solution designed to help address the industrywide challenge of the loss of zonal isolation due to changes in the wellbore that can stress the cement sheath and lead to destabilization at any point during the life of the well.
Along with pressure events and temperature cycling, wells are subjected to substantial stresses from changes in the surrounding formation over years, even decades. The annular seal can succumb to these forces, compromising zonal isolation and, thus, reducing the economics of the well by inhibiting production and/or requiring costly remediation.
"Up until now, the well-construction industry has focused on cement properties such as cement placement, preventing gas migration and compressive strength," said Tommy Roth, vice president of Cementing, Halliburton's Completion and Production Division. "This approach has been necessary to optimize drilling time but does not account for maintaining zonal isolation for the life of the well. WellLife III cementing service enables zonal isolation over time, even when the well is subjected to various stresses. Halliburton is changing the industry's fundamental approach to cementing."
WellLife III cementing service is designed to stop the flow of unwanted fluid and gas in the annulus at any time during the life of the well, preserving production while reducing or even eliminating costly remediation. This comprehensive solution includes:
- Powerful diagnostics software tools that provide the ability to analyze specific wellbore conditions and operational activities that exert stresses on the cement sheath.
- Cement systems engineered with resilient components to withstand stress and endowed with the ability to react and respond to both predictable and unpredictable wellbore conditions. The latest of these systems is LifeCem cement. The reactive components of the LifeCem cement will remain dormant in the annulus, automatically responding in the event of any flow of unwanted hydrocarbons to re-establish the annular seal.
- Zonal isolation assurance tool, based on Halliburton's proprietary Swell Technology materials, provide a resilient mechanical barrier at strategic points in the annulus. The tool is designed to address the challenge of incomplete mud displacement when difficult mud removal conditions are encountered and also provide an additional reactive component of the annular-seal system. In the event of incomplete mud displacement the tool will swell into any un-cemented space in the annulus to establish zonal isolation without external intervention.
With increased complexities of well designs and harsher environments, the potential loss of cement-sheath integrity resulting in annular pressure and/or the loss of downhole pressure containment will only become a larger issue.
"For years the industry has tended to view cementing as a separate event from well performance," said David King, president, Halliburton's Completion and Production Division. "However, Halliburton has scientifically investigated the potential damage to the cement sheath created by the cumulative stresses in and around the wellbore. We are challenging conventional thinking by taking the stand that it is no longer sufficient to focus solely on achieving a competent cement bond log when the technologies are now available from Halliburton for cementing systems to be designed for years of use and abuse."
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