Operation

As part of formation-evaluation programs in all exploration and development wells, a large variety of caliper instruments are used either as stand-alone devices or in combination with other measurements. The WGI measurement service addresses the most significant shortcomings of previous caliper tools: high-resolution calipers cannot acquire data while running in the hole, and instruments designed to work in both directions do not acquire measurements with high-enough resolution.

Highlights

• Can acquire data in both upward and downward directions
• The small contact area of the caliper measuring tips allows high-resolution measurements
• Can be run simultaneously with an orientation instrument at all sample rates
• Combinable with all other openhole instruments in any string configuration
• Brings significantly improved vertical and azimuthal resolution when compared to other caliper devices

Benefits

• When logged as part of the first openhole string, the WGI measurement service provides an early insight into the hole quality for wellsite completion decisions
• Fully oriented hole geometry profiles can be generated at the wellsite to determine testing and sampling feasibility
• Provides accurate environmental corrections for petrophysical services reducing uncertainty in formation evaluation

Specifications

A fully open mechanical section of the Well Geometry Instrument showing the telescoping arm design which allows full 6-radii logging in both directions.

Example of a field presentation of a 3-D-borehole profile acquired while running in hole using a WGI caliper in combination with the Baker Atlas Reservoir Characterization Instrument^SM (RCI^SM) service. No testing or sampling attempts were made at the out-of-gauge borehole intervals, clearly visible in the 3-D profile, saving a significant amount of rig time.