The present application provides a seafloor multi-wave seismic source including: a pressure chamber mechanism; a high-voltage pulse generator with four discharge pathways; a thrust mechanism with a thrust rod and a thrust head; four vibrators are evenly distributed around a periphery of the thrust head, and each vibrator is connected with one discharge pathway of the high-voltage pulse generator; a power supply unit to power the seismic source; and a processor, a memory and a program, wherein the program is stored in the memory and configured to be executed by the processor; and the program includes: pulse emission instructions generated by the processor based on user settings and received by the high-voltage pulse generator, for switching on four or any two of the four discharge pathways at the same time, to enable the corresponding vibrators to vibrate to excite seismic waves in compression wave mode or shear wave mode.

An electrical tool for well stimulation includes a first electrode and a second electrode. The second electrode being at the level of a first segment and a second segment of the tool. A peripheral electrode insulated electrically from the first electrode. The first segment and the second segment are linked by an articulated link inside which is arranged a coaxial cable running from the first segment to the second segment. The coaxial cable includes an electrically conducting outer envelope insulated electrically from an electrically conducting central core. The tool includes a first electrical contact between the central core of the coaxial cable and the first electrode, and a second electrical contact between the outer envelope of the coaxial cable and the second electrode.

An electrical tool for well stimulation includes a first electrode and a second electrode. The second electrode being at the level of a first segment and a second segment of the tool. A peripheral electrode insulated electrically from the first electrode. The first segment and the second segment are linked by an articulated link inside which is arranged a coaxial cable running from the first segment to the second segment. The coaxial cable includes an electrically conducting outer envelope insulated electrically from an electrically conducting central core. The tool includes a first electrical contact between the central core of the coaxial cable and the first electrode, and a second electrical contact between the outer envelope of the coaxial cable and the second electrode.

Systems and methods for surveying a seafloor utilize two or more of seismic data, acoustic data and electrical potential or resistivity data to identify the locations of objects on or beneath the seafloor. The methods involve moving survey equipment over a geographic area of the seafloor and conducting a plurality of sensing or detecting operations while moving the survey equipment over the geographic area. The plurality of operations include two or more of: (1) a seismic operation that emits seismic energy toward the seafloor and collects seismic data based on seismic energy that returns from the seafloor, (2) an acoustic operation that emits acoustic energy toward the seafloor and collects acoustic data based on acoustic energy that returns from the seafloor, and/or (3) an electrical operation that supplies electrical power into seawater and that collects electric potential data indicative of electric potential that is induced into the seawater.

A spark-gap of an electric arc generation device for creating a seismic wave comprises: a first electrode connected to a first electrode mounting, a second electrode connected to a second electrode mounting and having a concave surface facing the first electrode and a diameter substantially greater than the diameter of the first electrode, and at least one connection arm connecting the first electrode mounting to the second electrode mounting. The disclosure also relates to an electric arc generation device comprising such a spark-gap.

A spark-gap of an electric arc generation device for creating a seismic wave comprises: a first electrode connected to a first electrode mounting, a second electrode connected to a second electrode mounting and having a concave surface facing the first electrode and a diameter substantially greater than the diameter of the first electrode, and at least one connection arm connecting the first electrode mounting to the second electrode mounting. The disclosure also relates to an electric arc generation device comprising such a spark-gap.

A method and system for electromagnetic method (EM) signal detection based on an onshore sparker source, the method including: arranging an EM signal detection system near a sparker source; releasing, by the sparker source, an electromagnetic pulse concomitantly in a discharge and mechanical energy output process; observing an electromagnetic response generated by the earth under the excitation of the electromagnetic pulse by means of the EM signal detection system for extracting distribution information of geo-electrical parameters; when the sparker source moves, moving the electromagnetic method signal detection system to a new position along with the sparker source while keeping their positions relative to each other unchanged; and repeating the above process after the movement is completed. According to the technical solution of the present invention, fine electromagnetic detection results can be obtained while seismic detection is carried out.

A method and system for electromagnetic method (EM) signal detection based on an onshore sparker source, the method including: arranging an EM signal detection system near a sparker source; releasing, by the sparker source, an electromagnetic pulse concomitantly in a discharge and mechanical energy output process; observing an electromagnetic response generated by the earth under the excitation of the electromagnetic pulse by means of the EM signal detection system for extracting distribution information of geo-electrical parameters; when the sparker source moves, moving the electromagnetic method signal detection system to a new position along with the sparker source while keeping their positions relative to each other unchanged; and repeating the above process after the movement is completed. According to the technical solution of the present invention, fine electromagnetic detection results can be obtained while seismic detection is carried out.

The present invention concerns a device for pulsed electric discharge in a liquid comprising a control module configured to control a voltage generator such that the voltage generator applies a predetermined heating voltage setpoint between electrodes during a heating period until a pulsed electric discharge is obtained between the electrodes, in order to measure the breakdown voltage during the pulsed electric discharge, in order to estimate the quantity of energy supplied to the liquid during the heating period, referred to as the “quantity of heating energy”, from the predetermined heating voltage setpoint and the measured breakdown voltage, and in order to determine a new heating voltage setpoint to apply between the electrodes of the at least one pair of electrodes at the next pulsed electric discharge based on the estimated quantity of heating energy and a predefined breakdown voltage setpoint.

The present application provides a seafloor multi-wave seismic source including: a pressure chamber mechanism; a high-voltage pulse generator with four discharge pathways; a thrust mechanism with a thrust rod and a thrust head; four vibrators are evenly distributed around a periphery of the thrust head, and each vibrator is connected with one discharge pathway of the high-voltage pulse generator; a power supply unit to power the seismic source; and a processor, a memory and a program, wherein the program is stored in the memory and configured to be executed by the processor; and the program includes: pulse emission instructions generated by the processor based on user settings and received by the high-voltage pulse generator, for switching on four or any two of the four discharge pathways at the same time, to enable the corresponding vibrators to vibrate to excite seismic waves in compression wave mode or shear wave mode.