With the rise in production from unconventional plays, horizontal wells have become increasingly common. Production logging in horizontal wells with multiphase flow has always been challenging. As the wells drilled over the past few years approach a maturing stage, it is increasingly necessary to evaluate the performance of the wells and identify water sources to help ensure proper reservoir management. As such, array tools were developed to overcome the limitations posed by a conventional production logging strings.
This paper highlights several field cases of production logs run in an unconventional shale play. The production logging was performed with an array tool string, in which conventional production logging tools were also attached. Interpreting the conventional production logging tools separately from the array production logging tools highlights the limitations of using conventional production logging tools. It has been observed that the interpretation of results from conventional production logging tools in highly deviated wells is either pessimistic or optimistic, depending on the final configuration of the wellbore. Array production logging tools provide a complete picture of the wellbore; thus, leading to a more comprehensive interpretation.
