Borehole geophone

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Product overview
The three geophones are mounted in a Cartesian (3C) configuration for acquisition of three‑axis seismic/vibration signals. Intended for engineering vibration measurements such as shear‑wave velocity testing and cross‑hole investigations. Available wall coupling: airbag coupling or electric (mechanical) coupling. Rated for downhole use to depths up to 130 m and designed for reliable waterproof operation. The unit uses a dedicated tensile‑resistant geophysical cable with integrated length markings; no separate steel winch rope or external length scale is required. Built‑in detectors cover a natural frequency range of 10 Hz to 35 Hz. Cable length is configurable to customer requirements and delivered with length markers.

Applications & composition

• Primary applications: shear‑wave velocity testing, engineering vibration measurement, cross‑hole surveys, microseismic monitoring.
• Typical composition: three‑component sensor element (Cartesian), metal or aluminum alloy housing, geophysical cable, tail cone and accessories.
• Coupling options: airbag (seal) coupling or electric/mechanical coupling module.

Features

• Three‑component arrangement provides complete 3‑axis seismic/vibration signals.
• Suitable for cross‑hole deployment at arbitrary depths and in boreholes of varying diameters within rock and soil layers.
• Dedicated tensile geophysical cable with integrated length marking simplifies deployment (no separate length scale or steel wire required).
• Waterproof and shock‑tolerant design for downhole environments (maximum test depth ≤ 130 m).
• Detector natural frequency range: 10 Hz–35 Hz (model‑dependent within the series).
• Cable length configurable to site requirements.

Applicable models / classification

• Downhole 3C string (this product category).
• Also applicable in workflows for microseismic or single/three‑component geophone deployments.

Technical specifications

• Installation: three geophones mounted in Cartesian coordinate system (3C).
• Coupling: airbag coupling / electric coupling.
• Maximum working depth: ≤ 130 m.
• Waterproof rating: suitable for downhole use.
• Detector (geophone) natural frequency: 10 Hz–35 Hz (series range).
• Cable: dedicated tensile‑resistant geophysical cable with length marking; high tensile strength and good conductivity; customizable length; delivered with length markers.
• Typical materials: geophone core + metal or aluminum alloy housing + cable and tail cone.
• Intended measurements: shear‑wave velocity, cross‑hole, engineering vibration, microseismic monitoring.
• Reliability: designed for stable operation. Warranty: 1 year.