RU2457511C1 - Seismic wave generator - Google Patents

Abstract

FIELD: physics.

SUBSTANCE: disclosed is a seismic wave generator having a power supply, a loading board and a radiating body with a magnetic system. The generator has one or more electromagnets having a magnetic conductor of an armature separated by a gap from the magnetic conductor of an inductor with an exciting coil mounted on a radiating board. The magnetic conductor of the armature is rigidly connected to the top part of the housing of the radiating body, and the magnetic conductor of the inductor is mounted with possibility of vertical displacement on pins on the housing between at least two pairs of damper spacer springs. The generator also has a platform and pontoons, wherein hydraulic shock absorbers of the radiating board are mounted on the platform, resting on two pontoons between which the radiating board is mounted on the third pontoon.

EFFECT: high radiation power level of the useful signal and accuracy of setting the wavefront time of the radiation pulse.

6 cl, 5 dwg

Description

The invention relates to seismic exploration of minerals by non-explosive sources and can be used in seismic surveys both on land and in marine seismic exploration in the conditions of transit zones and extreme shallow water.

It is known "DEVICE FOR CREATION OF SEISMIC SIGNALS IN WATER SEISMIC EXPLORATION" (Pat. RF №2345386. Publ. 27.01.2009). The device comprises a metal plate fixed in the opening of the bottom of the floating vehicle and playing the role of a membrane between the hold of the floating vehicle and the aqueous medium, a pulsed power generator and a striker with a striker. At the same time, a fixed plate was used as a metal plate fixed in the opening of the bottom of the floating vehicle and playing the role of a membrane between the hold of the floating vehicle and the aqueous medium.

The disadvantage of this device is the difficulty of organizing work in shallow water (rivers, lakes, shallow transit zones of the sea shelf) with a minimum reservoir depth of 0.3 m or less, including transporting the source by a water vehicle with the required draft in the study area.

Also known is a technical solution that most fully discloses the physical process of the device, "METHOD FOR EXCITING SEISMIC WAVES AND A DEVICE FOR ITS IMPLEMENTATION", RF patent No. 2411546. Publ. 08.24.2009, prototype). The device comprises an electrodynamic energy emitter, a connecting cable, an energy storage device and a control device. The electrodynamic energy emitter contains a sealed cylindrical body, mounted on the base of the emitter (base plate), in which the electrodynamic energy transducer and guide racks are placed. The electrodynamic energy converter is an included counter-plane solenoids, one of which is fixed in the groove of a steel plate (cargo plate), rigidly connected to the base. The plate is made in the form of a magnetic field concentrator. Another solenoid is fixed in the groove of the steel plate (radiating plate), mounted with the possibility of its free movement in the vertical direction on the guide racks. Guide racks and housing are rigidly attached to the base.

The objective of the proposed technical solution is to eliminate the noted disadvantages, namely: increasing the radiation power level of the useful signal, the accuracy of setting the time of the radiation pulse front and ensuring work in shallow water (rivers, lakes, shallow-water transit zones of the sea shelf) at all depths of the reservoir to a minimum depth of 0 3 m or less, including transportation of the source by a watercraft with the required draft for the study area.

To solve this problem, a seismic wave source containing a radiating plate, an electric power system, a cargo plate, one or more electromagnets, each consisting of an armature and an inductor with an excitation coil, mounted on the cargo plate, and hydraulic shock absorbers for shock-free lowering of the cargo plate, are additionally included a platform and two pontoons, with hydraulic shock absorbers and a cargo plate mounted on a platform supported by two pontoons, and a radiating plate is placed between the pontoons. The platform is made with a through rectangular hole, at the corners of which guides are installed under the supporting posts of the radiating plate and vertical guide pins for the cargo plate. One or more inductors are mounted on the load plate, two brackets are installed to support the hydraulic shock absorbers and the holes for the guide pins of the platform. Each inductor is equipped with two vertically mounted guide pins to move the anchors, which lie freely on the supporting posts of the radiating plate and have holes for the guide pins of the inductors. On the radiating plate, which is fixed with the third pontoon, support posts are fastened under the anchors of electromagnets moving along the platform guides. Spring units are installed on the platform and the support racks of the base plate, and the internal cavity of the pontoons is filled with foamed polymeric material or a rubber inflatable container.

A significant difference of the proposed technical solution is the additional inclusion of the platform and two pontoons, and the hydraulic shock absorbers and the load plate are mounted on a platform supported by two pontoons, and the radiating plate is placed between the pontoons. This technical solution allows you to transport the device in transit zones and extreme shallow water.

The second significant difference is that the platform is made with a through rectangular hole, at the corners of which the guides are installed under the support posts of the radiating plate and the vertical guide pins for the cargo plate. One or more inductors are mounted on the load plate, two brackets are installed to support the hydraulic shock absorbers and the holes for the guide pins of the platform. Each inductor is equipped with two vertically mounted guide pins to move the anchors, which lie freely on the supporting posts of the radiating plate and have holes for the guide pins of the inductors. This technical solution provides a stable position of the radiating plate in the horizontal plane and the freedom of its vertical movement.

The third significant difference is that on the radiating plate, which is fixed with the third pontoon, support posts are installed under the anchors, moving along the platform guides. Spring units are installed on the platform and supporting posts of the radiating plate. This technical solution provides a smooth return of the radiating plate to its original position after exposure and is guaranteed to maintain the necessary clearance between the armature and the inductor.

The fourth significant difference is that the internal cavity of the pontoons is filled with foamed polymeric material or rubber inflatable capacity, which provides an increase in buoyancy in case of possible damage to the bearing pontoons or the radiating plate.

On figa, b shows the source of seismic waves, side view (figa), and a plan view - fig.1b. Figure 2 shows an enlarged version of the node And from figa, b. Figure 3 - respectively, the node In of figa, b. Figure 4 - node C of figa, b, and figure 5 is a spring node.

The radiating device of the source of seismic waves (figa, b - 5) includes a pontoon 1 of the radiating plate 5, a power system 2 with an electric energy storage device and one or more electromagnets consisting of an armature 3 of an electromagnet and an inductor 4, mounted on a radiating plate 5, bearing pontoons 6 of the radiating body, platform 7, support legs 8, guides 9, hydraulic shock absorbers 10, guide pins 11, brackets 12, bushings 13, plates 14, studs 15, springs 16, nuts 17, filler 18 to increase buoyancy (polymer material or rubber inflating capacity).

The pontoon (1) of the radiating plate (5) is located between the supporting pontoons (6), connected by a catamaran type, to a platform (7), which has support legs (8) in the upper part. The passage of the support posts (8) of the radiating plate (5) through the platform (7) provides a hole through the perimeter of the support posts (8) in the platform (Figs. 1-4). The guides (9) at the corners of a rectangular through hole in the platform (7) limit the lateral and allow vertical movement of the radiating plate (5). For the emergence of an additional buoyancy force holding the radiating plate (5) in the initial position, it is equipped with a pontoon (1).

On the platform (7) in the longitudinal plane along the axis of symmetry, two hydraulic shock absorbers (10) are installed for shockless lowering of the radiating plate (5) and two guide pins (11) to limit the lateral movements of the radiating plate (5). The radiating plate (5) with the inductors (4) fixed to it through the brackets (12) rests on the discharge rods of the hydraulic shock absorbers (10) and lies with all its weight on the pontoon (1). In the lower part of the radiating plate (5) there are two blind holes with bushings 13 in which the guide pins (11) of the platform (7) are placed. On each inductor (4) in the vertical plane, two guide pins (11) are installed to center the armature (3) relative to the inductor (4). The anchor (3) with all its weight lies on the support posts (8) mounted on the platform (7) of the supporting pontoons (6) of the radiating body, and has two holes on the sides with bushings (13), in which the guide pins (11) of the inductor are placed (four).

To return the radiating plate (5) to its original position after exposure and guaranteed retention of the gap between the armature (3) and the inductor (4), spring assemblies (at least two) are installed (see figure 5), between the supporting posts (8) of the radiating plate (5) and platform (7). The lower plate (14) of the spring assembly (Fig. 5) with a pin (15) vertically fixed in it is mounted on the support post (8) of the radiating plate (5). The upper plate (14) has an opening for the passage of the studs (15), is mounted on the platform (7) and is a limiter for the movement of the radiating plate (5) upwards. A spring (16) is mounted on the stud (15), which is tightened with a nut (17) through the bushings (13) to the upper plate (14) of the spring assembly (Fig. 5). When the radiating plate (5) moves down, the spring (16) is compressed and creates efforts to smoothly return the radiating plate (5) to its original position.

To increase buoyancy in case of possible damage to the device, the carrier pontoons (6) of the radiating body and the internal cavity of the pontoon (1) of the radiating plate (5) are filled with foamed polymeric material (18) (such as expanded polystyrene) or a rubber inflatable container.

The source is as follows.

When discharging the cassettes of the capacitors of the power system (2), through the coils of the inductors (4), electromagnetic forces appear in them, attracting the radiating plate (5) with inductors (4) to the anchors (3), as a result, the radiating plate (5) with inductors jumps (4) up. At the same time, forces arising in the electromagnets through the supporting posts 8 of the radiating plate (5) and the plate itself act downward on the water surface through the carrier pontoons (6) of the radiating body.

The return of the radiating plate (5) to its original position and keeping it in operational readiness is carried out by a spring assembly (Fig. 5). For smooth lowering of the radiating plate (5), hydraulic shock absorbers (10) are installed on the platform (7), which exclude repeated blow through the carrier pontoons (6) of the radiating body, on the rods of which the radiating plate (5) with inductors (4) is supported by brackets (12) )

The design of the electromagnetic source of seismic waves for operation on water allows to reduce its total mass and realize the ability to work in conditions of transit zones and extreme shallow water.

The device, an electromagnetic source of seismic waves for operation on water, was manufactured industrially and tested during prospecting to determine oil and gas deposits in the Krasnoyarsk Territory.

Claims (6)

1. A source of seismic waves, including a power source, a load plate, a radiating body with a magnetic system, including one or more electromagnets containing an armature magnetic circuit and an inductor magnetic circuit separated by a gap with an excitation winding fixed to the radiating plate, and the armature magnetic circuit is rigidly connected to the upper part of the body of the radiating body, the magnetic circuit of the inductor is mounted with the possibility of movement in the vertical direction on the studs installed in the housing between at least two pairs damper springs, characterized in that it additionally includes a platform and pontoons, moreover, the hydraulic shock absorbers of the radiating plate are mounted on a platform resting on two pontoons, between which a radiating plate is placed on the third pontoon. 2. The source according to claim 1, characterized in that the platform is made with a through rectangular hole, at the corners of which there are guides for supporting posts of the radiating body and vertical guide pins for the radiating plate. 3. The source according to claim 1, characterized in that one or more inductors, two brackets for supporting the hydraulic shock absorbers are fixed on the radiating plate and holes are made for the guide pins of the platform. 4. The source according to claim 1, characterized in that each of the inductors is equipped with two vertically mounted guide pins to move the anchors that lie freely on the support posts of the radiating body, and holes for the guide pins of the inductors are made in the anchors. 5. The source according to claim 1, characterized in that the radiating body is made in the form of a platform resting on two pontoons, supporting racks are installed under it under the anchors of electromagnets, which move along the guides of the platform. 6. The source according to claim 1, characterized in that the platform and support legs of the radiating body are equipped with spring units, and the internal cavities of the pontoons of the radiating body and the radiating plate are filled with foamed polymeric material or rubber inflatable capacity.

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