RU2488144C1 - Seismic vibrator - Google Patents

Abstract

FIELD: physics.

SUBSTANCE: device has a mortar 1 with a central channel 8, a plunger 2 with a full-bore tailpiece 7, a cap 3 with a cut on the end surface, a tray 4 with a base plate 5, a guide gas-removing cover 6, an inclined channel 10 for lateral inlet of powder charge into the chamber of the mortar with a revolving cylindrical tap 11, a hole 12 in the wall of the chamber used to accommodate a sensor for measuring pressure of powder gases in the chamber during firing and for adjusting the relative position of electrodes of two electrode assemblies during maintenance, mechanisms for raising and lowering the mortar with a plunger and a base plate, mechanisms for mounting the source in a vehicle. All operation processes of the source are carried out automatically with remote control.

EFFECT: high functional capabilities of the device by enabling control of impact properties of the seismic vibrator.

2 dwg

Description

The invention relates to the field of shock impact seismic technology, to devices for exciting seismic vibrations in the exploration of minerals, mainly for oil and gas.

A known source of seismic vibrations (signals) of the mortar-plunger type (ISK MPT) according to the patent of the Russian Federation No. 2145428/1 /, working on granular artillery gunpowder.

It contains a mortar with a central axial, non-through channel; a base plate made in one piece with a mortar; a plunger (non-flying mine) with a caliber shank placed in the central channel; node lateral input of the powder charge into the chamber in the form of an inclined channel with a rotary cylindrical crane; the mechanism of ignition of the powder charge in the chamber of the mortar, made in the form of the bare ends of two electrodes placed motionless in the dielectric bottom insert (by the type of mechanism known from patent No. 2105263/2 /); vertically located guide gas vent for the movement of the plunger and the discharge into the atmosphere of powder gases; mechanisms for raising and lowering the mortar with a plunger and base plate; mechanisms for securing the source in the vehicle.

Before work, the mortar with the help of its mechanisms is lowered by the base plate onto the ground and is drawn to it. When fired, the plunger gets a speed of the order of 5-7 m / s and, moving inside the gas casing, “jumps” to a height of about 1.75-2.5 m.

Source (ISK MPT) according to patent No. 2145428/1 / is adopted as a prototype.

The disadvantages of the prototype are;

a) the rigid fastening of the base plate with the mortar body eliminates the possibility of replacing a plate of one diameter with a plate of another diameter in accordance with the characteristics of the soil (hard, medium and soft), which significantly reduces the ability to control the impact characteristics of the source;

b) the implementation of the central axial channel non-through (“deaf”) significantly complicates the manufacturing technology of the mortar and almost completely eliminates the possibility of monitoring the state of the mechanisms of ignition of the powder charge placed in the chamber;

c) the implementation of the mechanism of ignition of the powder charge in the chamber of the mortar in the form of the bare ends of two electrodes fixedly placed in the dielectric bottom insert completely excludes the possibility of controlling this most important mechanism;

d) the possibility of measuring the pressure of the powder gases in the chamber of the mortar during the shot is not provided — this does not allow for timely detection of deviations of parameters in the main ISK MPT process — during the shot;

e) the possibility of monitoring and editing the mechanism of ignition of the powder charge in the chamber is not provided — this significantly reduces the reliability of the most important mechanism;

f) the possibility of changing the geometric volume of the mortar chamber is not provided — this excludes an effective way to control the ballistic characteristics of the ISK MPT.

The aim of the invention is to remedy the noted drawbacks. This goal is achieved by the following:

a) the base plate is removable in diameter, the plate of each diameter is equipped with a pallet for attachment to the mortar;

b) the central channel of the mortar is through and supplied with a removable plug with a recess of the required volume at its end;

c) the mechanism of ignition of the powder charge is performed in the form of two diametrically oppositely placed electrode assemblies having the possibility of controlled longitudinal movement due to screw cutting;

d) a through hole is made in the wall of the mortar chamber, used to place the sensor for measuring the pressure of powder gases in the chamber during the shot and to correct the relative position of the electrodes of the two electrode assemblies during technical inspections;

e) the geometric volume of the mortar chamber changes due to the use of a plug with a recess of the required volume.

ISK MPT in the working position is shown in Fig.1 and Fig 2. These two drawings are two sections of the same device.

In the drawings indicated:

1 - mortar; 2 - a plunger; 3 - a cap with a recess on the end part; 4 - pallet; 5 - plate; 6 - vertically located guide gas casing; 7 - caliber shank; 8 - trunk channel; 9 - mortar chamber; 10 - charging window; 11 - crane mechanism for sealing the inclined channel for introducing granular powder into the chamber of the mortar; 12 - hole in the chamber wall for monitoring the state of the mechanism of ignition of the powder charge and a socket for a sensor for measuring the pressure of powder gases in the chamber of the mortar; 13 - socket for one of the two electrode nodes of the ignition mechanism of the charge.

Similar execution of ISK allows you to achieve your goal

The source operates as follows. Before work, the mortar, the base plate, with the help of its mechanisms, is lowered to the ground and is pressed against it with great effort. When fired, the plunger receives a speed of the order of 5-7 m / s and, moving inside the gas casing, “jumps” to a height of about 1.75-2.5 m, followed by a fall and the creation of a second impact, equal in power to the first.

All operations of the operational functioning of the ISK of this type are performed automatically with remote control.

ISK of this design can be used to equip seismic systems for any purpose.

Information sources

1. RF patent No. 2145428, 7 G01V 1/104, 10.02.2000, bull. No. 4.

2. RF patent No. 2105263, 6 F42B 3/10, 02.20.1998, bull. No. 5.

Claims (1)

A source of seismic vibrations of the mortar-plunger type, operating on a granular propellant such as granular artillery powder, including: a mortar with a base plate and a central axial channel; a plunger (non-flying mine) with a caliber shank placed in the central channel; the site of the lateral input of the powder charge into the mortar chamber in the form of an inclined channel with a rotary cylindrical crane; the mechanism of ignition of the powder charge in the chamber of the mortar in the form of two diametrically opposite electrode assemblies; vertically located guide gas vent for the movement of the plunger and the discharge into the atmosphere of powder gases; mechanisms for raising and lowering the mortar with a plunger and base plate; mechanisms for placing the source in the vehicle, characterized in that the base plate is replaceable in diameter; the plate of each diameter is equipped with a pallet for fastening to the mortar; the central channel is made through and provided with a removable plug with a recess of the required volume at the end; the ignition mechanism of the powder charge is made in the form of two diametrically opposed electrode assemblies having the possibility of controlled longitudinal movement of the electrodes due to helical rifling; a through hole is made in the wall of the mortar chamber, used to place the sensor for measuring the pressure of powder gases in the chamber during the shot and to correct the relative position of the electrodes of the two electrode assemblies during technical inspections.

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