Unconventional hydrocarbon production has been known to revolutionize the oil and gas industry in the last decade. Though the advancement of drilling and well completions associated with tight sands and shale production, the assessment of downhole completion and fracture production remains challenging. The paper illustrates innovative approach to assess the success of multistage fracturing systems, evaluate both hydraulic and swellable packer condition, behind liner flow, and quantitative assessment of stages contribution.

The paper will discuss logging techniques using high definition spectral noise logging and numerical temperature modeling to assess flowing fractures, horizontal liner and behind liner well integrity including isolating packers and quantitative estimation of stage production in unconventional horizontal producer.

Downhole logging including a set of conventional multiphase sensors alongside with high precision temperature and high definition spectral noise logging was run in one of Saudi Aramco largest unconventional reservoirs to provide complete assessment of the horizontal section integrity and stage contribution.

The survey confirmed the success of fracturing process across the horizontal section and application of the new type of the completion.

Numerical temperature modeling was used to quantify flow across each production ports and at the top of each stage. The integration of all data set provides complete understating of well completion and production in one run. The quantitative assessment provided by numerical temperature simulation was in good correlation with the bore hole conventional array production logging results.

The results of the survey provided detailed assessment of the horizontal lateral production with high resolution across every producing port and provided valuable information about behind liner fracturing efficiency and completion packers’ integrity in one run.

Logging tools didn't include mechanical rotating parts, providing high degree of safety and reliability and leaving a very low foot print on the well. Comparison with array production logging run completed separately.

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