Production-Logging Tools Facilitate Well Testing in Challenging Environments

The Pugang gas field, one of the biggest inland gas discoveries of the last decade in China, has hydrogen sulfide (H₂S) concentrations as high as 10%, making surface- and downhole-facilities design and execution challenging. Testing these wells also is difficult because of the surface risks inherent in conventional testing. Well testing using production-logging tools recently has been introduced in this field and has been of tremendous benefit to the operator in identifying the inflow zones and in performing well-test analysis.

Field Introduction

The Pugang gas field, discovered in 2002, is the second-largest gas field in China and the largest sour field discovered in the last decade. This field is north of Chongqing in the Sichuan basin.