Case Study: South East Asia Well Producing Company identifies bypassed gas zones with SLB Pulsar multifunction spectroscopy service

Identifying Bypassed Producible Gas in a Complex Completion: Dual 3½-in Tubing in 8½-in Wellbore

SLB worked with South East Asia Well Producing Company, a producing well operator in Southeast Asia, to identify bypassed producible hydrocarbons in a complex completion. The well had dual 3½-in tubing strings in an 8½-in borehole and interbedded sand, shale, limestone, and coal, making it difficult to accurately determine recompletion targets with conventional logging.

Using SLB’s Pulsar multifunction spectroscopy service, including the new FNXS measurement, the team obtained a single cased-hole run that differentiated gas-filled porosity from tight zones and supported a full petrophysical volumetric interpretation. After applying corrections for the dual-tubing configuration and light hydrocarbon in the wellbore, the log data clearly identified potentially producible gas zones, with FNXS values aligning much more closely with expected shale, sandstone, and limestone responses and enabling recompletion targets without bias from the unusual completion.