Schlumberger

OBMI Oil-Base Microimager

Image features in oil-base and nonconductive muds as small as 0.4 in

The OBMI oil-base microimager tool makes it possible to conduct microresistivity imaging in oil-base, nonconductive, and invert-emulsion mud systems. For conventional microresistivity imager tools, even a thin film of nonconductive mud is essentially an opaque curtain that effectively prevents them from measuring the formation. The presence of nonconductive mudcake or oil-base mud filtrate further complicates the situation.

Detect and measure features too small for conventional logging

On images obtained with the OBMI tool, you can see structural, stratigraphic, and anisotropic features as small as 0.4 in [1 cm], giving you high-resolution azimuthal information. This image capture and resolution are not possible with conventional logging techniques.

The resemblance of the images to whole-round core lets you easily visualize the reservoir. This is a first for the nonconductive mud environment.

The OBMI tool has been validated in the field with more than 20 brands of diesel-, oil-, and synthetic-base muds.

Clearly resolve microresistivity, images, and dip

Each of the four pads of the OBMI imager acquires five potential difference measurements that are used to quantitatively determine the resistivity of the invaded zone. The resulting color image is displayed oriented with respect to the geometry of the tool and the borehole. The measurement sensitivity of the OBMI imager delivers computed dips that are highly accurate even in formations with little resistivity contrast.

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