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

GStreamer - 3C multi-level downhole seismic array with spring anchoring

Main features:
  • Remote triggering of anchoring system
  • Most compact and lightweight in the world
  • No extra load required to lower into the well
  • Compatible with almost all seismographs
  • Simple and reliable design
4 tools / 1 m tool spacing / 100 m cable
4 tools / 1 m tool spacing / 100 m cable 8 tools / 1 m tool spacing / 100 m cable Custom design Add 50 m cable
Price: on request
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GStreamer is designed for vertical seismic profiling (VSP) and cross-hole seismic testing and tomography (CST) in boreholes with PVC casing. Tool locking is provided by a spring system with controlled remote triggering. It can consist of 4 or 8 borehole 3C geophones on a cable.

The use of a spring system allowed to smooth the dependence of the clamping force from the well diameter. The ratio is between 1:7 - 1:11 relative to the tool weight, that correlates to the parameters of “oil & gas” VSP probes and guarantees the highest data quality.

GStreamer has two geophones for each component with a natural frequency of 12 Hz. This grouping allowed to increase the sensitivity and at the same time maintain the minimum dimensions of the tool. Data registration is provided by almost any seismograph.

At the user's request, GStreamer can be equipped with a connector for reference geophone on the surface to control source-seismograph synchronization and improve the accuracy of interval velocities calculation.

GStreamer with borehole sources of shear waves SHock or GeoSV are designed for crosshole seismic testing (ASTM D4428 / D4428M) or crosshole seismic tomography with registration of P and S waves in dry and water-filled wells. You can read about these technologies here.

GStreamer can be supplied on a reel or a BGW light winch, both with a slip ring.

Delivery set:
  • 4 or 8 tools multi-level 3C borehole array GStreamer
  • Additional set of springs
  • Wire rope on a reel for triggering anchoring system and securing
In addition to GStreamer the following items can be purchased:
  • Reel for a 12-channel GStreamer
  • Reel for a 24-channel GStreamer
  • BGW light winch
  • Energy source Jack with remote control JackPad
  • Borehole sources of pressure P (Pulse) or shear SH-waves (SHock) and SV-waves (GeoSV)
  • Borehole hydrophone array WellStreamer
  • High-frequency seismographs Sigma4+ or DAQlink4
  • Borehole inclinometer

We have also developed multi-level 3C systems GStreamer-E with individually controlled electromechanical anchor, as well as simpler and cheaper GStreamer-P with pneumatic driven anchors.

Example of field data for VSP on P- waves, obtained with GStreamer geophone array
Example of VSP data (Z component) acquired with GStreamer.
The distance between the source (sledgehammer) position and wellhead is 5 m. Borehole receiver position spacing - 1 m, depth range - from 5 to 124 m.
Example of field data for VSP on S- waves, obtained with GStreamer geophone array
Example of S-waves VSP data acquired with GStreamer.
Horizontal component after orientation and subtraction of right and left shots. The distance between the source (sledgehammer) position and wellhead is 0.6 m. Borehole receiver position spacing - 1 m, depth range - from 1 to 120 m.
Example of field data for VSP on SH- waves, obtained with GStreamer geophone array
Example of S-waves VSP data acquired with GStreamer.
Horizontal component after orientation and subtraction of right and left shots. The distance between the source (sledgehammer) position and wellhead is 0.6 m. Borehole receiver position spacing - 1 m, depth range - from 1 to 120 m.

Model

GStreamer

GStreamer-P

GStreamer-E

Number of levels

4 or 8

4 or 8

1, 4, or 8

Anchoring

spring system

pneumatic cylinder

geared motor

Well casing type

PVC

any or open hole

any or open hole

Number of components

3

3

3

Geophones natural frequency

12 Hz or 20 Hz (on request)

12 Hz or 4.5 / 20 Hz (on request)

Tool locking

remote triggering

simultaneous

individual

Clamping force

1:7 – 1:11

1:11 at 7 atm.

1:11

Maximum tool diameter

60 mm

58 mm

Well diameter range

70 - 150 mm

65 - 150 mm and more with anchor extenders

Maximum operating pressure

15 bar

>100 bar