A new side-looking downhole magnetic resonance imaging tool.

Area of Science:

• Geophysics
• Petroleum Engineering
• Nuclear Magnetic Resonance

Background:

• Conventional downhole NMR tools primarily provide depth information, neglecting crucial radial profile data.
• Radial reservoir information is vital for accurate formation evaluation and resource assessment.
• Improving pad or side-looking tools is essential for obtaining comprehensive downhole measurements.

Purpose of the Study:

• To design and construct a novel side-looking downhole NMR tool.
• To enable simultaneous acquisition of depth and radial reservoir information.
• To enhance reservoir characterization in challenging geological settings.

Main Methods:

• Developed a new side-looking NMR tool incorporating main and pre-polarized magnets.
• Utilized pre-polarized magnets to enhance magnetic field homogeneity and sample polarization.
• Designed a winding coil with multiple frequencies to match the static magnetic field for depth-specific measurements.

Main Results:

• The new tool successfully provides depth and radially resolved reservoir information.
• Demonstrated effective tool performance with a short echo time of 0.25 ms, ensuring data accuracy.
• The sensitive region creates a side-looking image of the borehole wall.

Conclusions:

• The developed side-looking NMR tool effectively addresses the limitations of conventional tools.
• This technology offers a significant advancement for the detection and characterization of unconventional reservoirs.
• The tool's ability to provide rich, accurate, and radially resolved data enhances reservoir understanding.