Unconventional completion method for high-risk shale well sought

In one horizontal well, Talisman Energy encountered challenging cementing conditions that resulted in less-than-optimal cement quality in the 700-m long heel portion. This meant that Talisman Energy could not perform its usual plug-and-perf completion method, which requires mechanical zonal isolation between stages for optimum stimulation. Talisman Energy needed a way to stimulate the interval cost effectively while minimizing operational time.

Continuous completion operation based on real-time reservoir response

To effectively stimulate the intended interval without bridge plugs, Schlumberger recommended a multistage stimulation approach using StimMORE fiber-laden diversion fluid and StimMAP fracture mapping service. StimMAP service would deliver microseismic event data within seconds, enabling real-time optimization of diverter placement and hydraulic fracturing treatments.

Slugs of StimMORE diversion fluid were placed into the fracturing fluid, eliminating the need for mechanical isolation between fracturing stages. The engineered fluid bridged stimulated intervals along the borehole, generating sufficient pressure differential to initiate fractures in unstimulated intervals. The process was repeated until the entire 700-m lateral interval was effectively stimulated.

Reduced risk, time, and costs compared with plug-and-perf methods

Integration of real-time microseismic data in the Petrel E&P software platform let engineers control placement of diversion fluid during the job. Talisman Energy and Schlumberger worked together to analyze< microseismic and pumping data after each diversion, confirm sufficient reservoir stimulation, and adjust the treatment as needed.

The design was completed as planned—in just 18 h and one continuous operation—saving 10 h versus conventional completion treatments. Microseismic data confirmed uniform stimulation coverage of the heel portion of the wellbore.