Compact Sonic Tool
Providing accurate acoustic reservoir measurements with industry leading conveyance options
- Determining secondary porosity and lithology
- Determining formation mechanical properties
- Providing gas detection
- Integrating seismic, time-to-depth corrections
- Providing a synthetic seismogram (when used with the MPD tool)
- Providing a cement bond log (CBL)
Features and Benefits
- Unlike traditional 3- to 5-ft (0.91- to 1.52-m) sonic tools, the Compact™ Sonic Sonde (MSS) uses a single-sided array with depth-derived, cave compensation and tilt correction. This feature, together with a short electronics package, makes the tool unusually short and light.
- The MSS passes through restrictions as small as 2.5 in. (63 mm), enabling thrudrillpipe logging for increased operational efficiency.
- The MSS is combinable in a tool string with other Compact tools.
The Weatherford Compact sonic sonde (MSS) measures formation compressional slowness (inverse velocity) at five long spacings with 1- and 2-ft (0.30- and 0.61-m) vertical resolution. In cement bond log (CBL)/variable density log (VDL) mode, the MSS tool records a waveform (normally from the 5-ft [1.52-m] receiver) and up to four first-arrival amplitude logs. The ratio of two amplitude curves defines an attenuation log that is sensitive to cement bond quality.
Data quality is maintained at high levels over a broad range of environmental conditions from a combination of high transmitter output, real-time despiking, and cycle-stretch compensation. Cycle-stretch compensation gives improved accuracy and consistency by adjusting transit times based on information about waveform shapes close to the first arrivals.