Multi-pole Array Tool

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This tool can be used to make the following measurements: mono-pole array acoustic measurement, cross dipole (XX dipole and YY dipole) array acoustic measurement, quadra-pole array acoustic measurement.

There are four sets of transmitters in the transducer system: One set of monopole transmitter, two sets of cross dipole transmitters at the same depth and one set of Quadra-pole transmitter. There are eight receiver stations with four receivers in each station. The total thirty-two broadband receivers can provide high quality waveform data.

The dipole flexural wave propagation allows for the measurement of shear wave slowness in virtually all the formation conditions. It can be used to get the fast shear wave and slow share wave travel time in two orthogonal directions. The acquired logging data can be used to calculate plenty of petrophysical parameters and rock mechanical parameters for variety of usages in different phases in oil exploration and production. Such as lithology identification, natural fracture identification, porosity calculation, formation fluid differentiation for formation evaluation; borehole stability analyses, formation fracturing pressure prediction, the minimum and maximum principal in-situ stress calculation and stress orientation estimation for drilling/completion/fracturing/oil production etc.

The compressional P-wave slowness /amplitude, refracted shear wave slowness/amplitude and Stoneley wave properties are obtained from monopole data and quadra-pole data.

This tool can work in both water based and oil-based mud system. This multi-purpose tool is useful in both open hole and cased hole. Field practice indicates the effectiveness of this tool in induced-fracture identification and fracture height estimation after stimulation.

Features

The robust mechanical design of this tool allows for successful jobs in deviated/horizontal wells.

Applications

  • Lithology identification
  • Formation porosity evaluation
  • Fracture Identification
  • Formation anisotropy analyses
  • In situ earth stress analyses
  • Formation fluid differentiation
  • Permeability estimation
  • Borehole stability analyses
  • Rock strength analyses
  • Induced-fracture evaluation after stimulation
  • Synthetic seismogram
  • AVO calibration
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