 The Array Seismic Imager (ASI) consists of an array of five seismic shuttles linked by a bridle to a signal-conditioning cartridge. Each shuttle sensor package contains three mutually orthogonal geophones fixed relative to the sensor package geometry. One geophone lies along the axis of the package (z-axis); the other two geophones (x- and y-axes) form a 45° angle relative to the clamping direction. This design allows the ASI tool to operate in wells with a 90° deviation while not exceeding the 45° limitation of the X and Y geophones. For the study of anisotropy and analysis of split shear, these features make the ASI tool reliable in both vertical and deviated wells, with consistent X and Y component response.
The ASI tool is unique in that it ensures consistent, lengthy coupling periods during downhole seismic acquisition, both in vertical and deviated wells. This feature makes the ASI tool ideal for 2D and 3D time-lapse borehole seismic surveys, reservoir monitoring applications and amplitude variation with offset (AVO) calibration walkaways.
The ASI can acquire three-dimension walkaway vertical seismic profile (VSP) surveys in both vertical and deviated wells. One of the primary benefits to ODP is its low deployment time, since multiple geophones are deployed simultaneously.
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Temperature Rating:
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350° F (175° C) |
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Pressure Rating:
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20 kpsi (13.8 kPa) |
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Tool Diameter:
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3.375 in (8.57 cm) |
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Minimum Tool Length:
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280 ft (85 m) |
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Sampling Interval:
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1, 2 and 4 msec |
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Max. Logging Speed:
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Stationary |
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Vertical Resolution:
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N/A |
The standard ASI tool can be used in cased holes without special equipment. Adding a bowspring assembly allows surveying of open holes from 8 1/2 to 13 in.
Stuck/lost tool information
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