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An offshore operator in China’s Bohai Bay needed to identify the productive gas/ oil zones in a new well block. Traditional methods used for gas/oil identification use radioactive or chemical sources to acquire porosity measurements. Because these sources are very restricted in Bohai Bay, the company wanted to find a way to acquire porosity measurements in their 12-¼-in. borehole using another option.

Baker Hughes, a GE company (BHGE), proposed use of its MagTrak™ loggingwhile- drilling (LWD) magnetic resonance service to gather the measurements and identify the potential gas/oil zones. MagTrak’s real-time nuclear magnetic resonance transversal relaxation (NMR T2) accurately measures formation porosity using no radioactive or chemical materials.

The operator was very interested in testing out this new technology as a potential way to comply with the Bohai Bay restrictions while developing the rest of the block.

Download the PDF to read the full case study.

Challenges & Results
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Challenges

  • Identify productive zones in a new, unknown block
  • Obtain porosity measurements in a location with strong source restrictions

Results

  • Located gas/oil zones with no use of radioactive or chemical sources
  • Proved accurate porosity measurements could be obtained with one run
  • Saved two days or rig time by eliminating second run