Equipment & Software for Geophysical Surveys: Design, Manufacture, Support, Supply

Borehole hydrophone array WellStreamer

Main features:
  • Specifically designed for HR borehole surveys
  • Fast and simple infield operations
  • High sensitive acceleration-free piezoceramic sensors
  • Small diameter and light weight
  • Compatible with any seismograph
4 channels / hydrophone spacing 1 m / 100 m cable
4 channels / hydrophone spacing 1 m / 100 m cable 6 channels / hydrophone spacing 1 m / 100 m cable 12 channels / hydrophone spacing 1 m / 100 m cable 24 channels / hydrophone spacing 1 m / 100 m cable 48 channels / hydrophone spacing 1 m / 100 m cable Custom design Cable length extension Reel with slip ring
Price: on request
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WellStreamer is a borehole hydrophone array, specially developed for seismic acquisitions in water-filled wells. We designed an exceptionally easy to use and robust receiver tool with sensitive acceleration-free piezoceramic sensors and signal preamplifiers in each module for registering compressional (P) waves during VSP, cross hole surveys, parallel seismic testing, and other high-resolution borehole seismic techniques. WellStreamer is also used for geotechnical monitoring of the structure of berths, dams, and other hydraulic structures - in this case, it can be located below the water surface on one side of the construction. Measuring the length of piles by parallel seismic testing, geotechnical control of the soil stabilization process, control of the continuity and thickness of the ice wall during the mine shaft construction are also hydrophone array applications.

WellStreamer can be supplied in various configurations, starting from 4 channels and up to 48 units with a typical separation of 1 m or 2 m. It can be equipped with a connector for reference land geophone to control source-seismograph synchronization during VSP survey and to improve the accuracy of interval velocities calculation. Signal registration is provided by almost any seismograph.

Mounted on a reel with a slip ring, which can be ordered with the streamer, it provides easy to operate data acquisition solution without spending time on unplugging equipment during cable operations. The convenience and safety of work in deep wells are ensured by specialized winches BGW and BGW light.

WellStreamer and 3C borehole array (GStreamer / GStreamer-P / GStreamer-E) with sources of pressure and shear waves Pulse, SHock, or GeoSV is an advanced equipment set for Crosshole Seismic Testing (ASTM D4428 / D4428M) or multiwave tomography with P and S waves registration. These technologies are designed to determine the Poisson's ratio and dynamic moduli of the studied geological layers in natural occurrence. Please see details here.

Areas of application of WellStreamer:
  • Borehole seismic surveys on land and in water areas using cross-hole seismic testing and tomography (CST), vertical seismic profiling (VSP), high-resolution VSP, low-frequency acoustic logging, seismic side scanning, etc.
  • Engineering surveys for the construction of highly sensitive facilities
  • Search for karsts, fractured and deconsolidated zones, and mining geophysics
  • Mineral exploration
  • Geotechnical monitoring of the soil foundation and determination of its load-bearing capacity, including in accordance with ASTM D4428 / D4428M standard
  • Crosshole logging of concrete foundations, piles, retaining walls, diaphragm foundations, dams, etc.
  • Soil stabilization control
  • Control of the continuity and thickness of the ice wall during the mine shaft construction
  • Cracks location in concrete hydroelectric dams
  • Parallel seismic testing of pile or foundations
Delivery set:
  • Hydrophone array WellStreamer
  • Battery with charger
  • Holder for fixing the array on the wellhead
In addition to hydrophone array WellStreamer the following items can be purchased:
  • Reel with slip ring
  • BGW or BGW light winch
  • Energy source Jack with remote control JackPad
  • Borehole sources of pressure (P) waves (Pulse) or shear (S) waves of horizontal (SHock) and vertical (GeoSV) polarization
  • Single and multi-level 3C borehole probes with spring (GStreamer), pneumatic (GStreamer-P), and electromechanical (GStreamer-E) anchoring systems
  • High-frequency seismographs Sigma4+ or DAQlink4
  • Borehole inclinometer INCLIS

Number of channels

4, 6, 12, 24, or 48

Operating frequency

10 - 10 000 Hz

Electric capacity of the piezoelectric element

4 000 pF

Sensitivity of the piezoelectric element

180 µV / Pa

Maximum working pressure

60 atm

Destructive pressure

> 100 atm

Sensitivity to accelerations

acceleration-free

Change in sensitivity depending on the depth

no

Type of the preamplifier

low-noise asymmetrical

Gain of the preamplifier

6 dB

Power supply voltage

bipolar from ±11 to ±16 V

Current per channel

10 mA

Output impedance of the preamplifier

395 Ω

Maximum value of the output signal

±3.8 V

Mean square voltage of the intrinsic electrical noise (output) in the working bandwidth does not exceed

10 µV

Operating temperature range

-10 ÷ +70 °С

Storage temperature range

-40 ÷ +70 °С

Hydrophone module diameter

42 mm

Length of the hydrophone module

200 mm

Weight of the hydrophone module

300 g

Inter-hydrophone distance on the array

on request, but ≥ 0.25 m

Cable shielding material

polyurethane

Longitudinal hermitization of the cable

yes

Shielding of the cable and hydrophone module

yes

Cable reinforcement

kevlar

Working load

200 kg

Breaking load

> 400 kg

Cable diameter

13 mm

Minimum bend radius of the cable

120 mm

Minimum bend radius of the active section

220 mm

Cable weight

168 g/m

Weight of the 130-meter hydrophone array with a reel

38 kg

Dimensions on a reel

760×775×400 mm

Maximum length of the hydrophone array

700 m

End connector

by agreement