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

Borehole sparker Pulse

Main features:
  • Easily replaceable electrode group
  • Can be used in wells with diameters starting from 40 mm
  • Reel with high-voltage slip ring
Pulse on a 100 m cable
Pulse on a 100 m cable Special edition
Price: on request
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Pulse is a borehole sparker, developed for generating compressional P-wave energy in water-filled wells. This type of source is typically used for crosshole seismic testing (CST) and vertical seismic profiling (VSP) acquisitions. In combination with Jack energy source it provides stable signal shape with high frequency energy spectrum.

Jack energy source generates a short high-voltage electric pulse of considerable energy, which ensures the formation of ionized high-pressure gas-vapor cavities on the electrode group of the Pulse sparker, placed in a container with salt water. With explosive expansion of the gas-vapor cavity, the pressure in it rapidly decreases, resulting in a precipitate drop in the temperature, vapor condensation and subsequent collapse of the cavity, what does not lead to parasitic pulsations. The design of the source provides easy replacement of electrode groups. Electrode groups may contain various number of electrodes, which allows to modify wavelet shape and its amplitude spectrum during the survey.

The standard diameters of the containers are 36 / 60 / 80 mm, thus allowing operations in wells with diameters starting from 40 mm. It is important to understand that in order to provide a stable pulse of high energy and a significant operational life of the source, a sufficient volume of the container and the number of electrodes greater than 25 are necessary. We have developed special type of electrodes from unique material that prevents tips from wearing and provides exceptionally stable signature over a long time period. 

Pulse sources are shipped on geophysical reels equipped with high-voltage slip rings. Thus, one does not need to disconnect the source from an energy source during operations of winding / unwinding the cable.

The set includes:
  • Pulse source
  • Power cable
  • Reel with high-voltage slip ring
  • Wire to connect a reel and a energy source
An example of the CST on P-waves field data obtained using the Pulse sparker, energy source Jack, and a hydrophone cable connected to ELLISS-3 seismic station
An example of the CST on P- waves field data obtained using the Pulse sparker, energy source Jack, and a hydrophone cable connected to ELLISS-3 seismic station:
above — CSP seismograms for two shot points; below — amplitude spectra of signal and noise recorded before first arrivals
Example of raw CST field data for operations with 3C acquisition system TELSS-VSP and sparker Pulse
Example of raw CST field data for operations with 3C acquisition system TELSS-VSP and sparker Pulse.
Two CSP seismograms for two shot points are depicted above. Amplitude spectra for P- and S- waves are depicted below. The source operation was provided by energy source Jack.
Work window of ZondST2d program
Work window of ZondST2d program.
On the left it is shown the coincidence of observed and calculated godographs, on the right — reconstructed velocity model with P- wave seismic ray tracing. On the right side of limestone base a karst cavity is allocated; in the left part the decrease in velocity is probably associated with decompression zone.

Operating voltage

up to 6000 V

Operating energy

up to 1500 J (optionally: up to 500 J, up to 2500 J)

Well diameters

from 70 mm (optionally: from 40 mm)

Diameter

60 mm (optionally: 36 mm, 80 mm)

Length

500 mm

Dimensions on a reel

800×700×400 mm

Weight with a reel and a 100 m cable

appr. 75 kg