| The Cross Multipole Array Acoustilog F1 (XMACSM F1) service is a fullwave monopole, inline dipole and crossdipole instrument that was developed through technology transfers and licensing agreements from ExxonMobil (source technology) and Shell (receiver technology). |
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Operation
The XMAC F1 service builds on the previous XMACSM Elite instrument already accepted as the benchmark for acquiring quality compressional and shear measurements over a broad range of borehole environments. The XMAC F1 service provides the best-quality monopole and dipole measurements in unconsolidated formations (Δtc>250 μs/ft, Δts>1200 μs/ft) where competitor tools have had difficulties performing.
A new telemetry scheme allows acquisition of a full data set twice as fast as the XMAC Elite service. Petrophycisists
can now easily get acceptance for acquiring data that otherwise would have been cost-prohibitive when rig time is high. It
allows Baker Atlas to record a full data set for later retrieval even if the need for the data is not apparent at the time of acquisition. Typical logging speed for inline and cross-dipole, full monopole and Stoneley data was 15 ft/min (4.6 m/min), while the XMAC F1 instrument records the same data at 30 ft/min (9.1 m/min).
Highlights
- “Best-in-Class” fullwave monopole and cross-dipole data even in unconsolidated, low-velocity formations
- Same depth co-located and matched dipole transmitters for cross-dipole anisotrophy measurements around borehole
- Most comprehensive dataset and lowest frequency transmission in industry providing true formation slowness
- Industry’s highest dynamic range providing reduced uncertainties
Benefits
- Rig time savings through single-pass data acquisition at 30 ft/min (9.1 m/min)
- Superior quality shear and compressional measurements for accurate seismic tie-in and rock property information
- Porosity determination, permeability indexing, hi-res processing
- Anisotrophy analysis for FRAC design, geomechanics
Specifications – Series 1678
| Description |
Specification |
| Length |
36.0 ft |
11.0 m |
| Diameter |
3.88 in. |
98.6 mm |
| Pressure Rating |
20,000 psi |
137.9 MPa |
| Temperature Rating |
350º F |
177º C |
| Weight |
636 lb |
288.5 kg |
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In this Gulf of Mexico Pleistocene example, ultra-slow formation data acquisition presents a difficult environment to determine accurate shear slowness. Shear slowness values are in the 800-900 usec/ft range. A comparison of the XMAC F1 demonstrates the superior capability of the XMAC Elite.
The Frequency vs. Amplitude graph demonstrates the significantly improved frequency and amplitude response of XMAC F1 transmitters.
The orientation of the fracture system indicated on the azimuthal anistrophy map is confirmed by the image data.
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