KR102102953B1 - Shear wave apparatus for downhole seismic method - Google Patents

Abstract

The present invention relates to a shear wave generator for exploring downhole seismic waves. The shear wave generator for exploring downhole seismic waves according to the present invention comprises: a base plate made of a metal, which is closely attached to and seated on the ground so that shear waves can be transmitted to the ground for exploring the seismic waves; a striking plate connected to the left and right of the base plate and transmits the shear waves generated by striking to the base plate; an air gun which loads and fires hammer bullets so that the hammer bullets accelerated by air pressure collide with the striking plate to generate the shear waves; and an induction pipe guiding the hammer bullets fired by the air gun to the striking plate.

Description

Shear wave apparatus for downhole seismic method

The present invention relates to a shear wave generator for exploring downhole seismic waves.

In general, the downhole seismic method (ASTM D 7400) grasps the velocity of seismic waves (P waves, S waves) by strata, calculates the dynamic characteristics of the target area, and calculates the dynamic ground constant to ensure the safety and rationality of structures. Provides dynamic ground information for design. It is necessary for seismic design of buildings, civil structures, etc. due to frequent earthquakes, and is one of the methods to obtain the seismic (P-wave, S-wave) velocity of the strata, which is an exploration that must be performed when installing facilities above the standard scale.

Generates seismic waves at the surface and records and analyzes the arrival time of seismic waves for each depth through a receiver (three-component geophone) inserted into the borehole to measure the seismic velocity (longitudinal and transverse waves) of each layer of the ground. In order to generate seismic waves, a plate fixed to the ground is hammered in a vertical and horizontal direction using a hammer. At the vertical price, a longitudinal wave in which the motion of the particle is the same as that of the wave occurs mainly, and at a horizontal price, a transverse wave in which the motion of the particle is perpendicular to the direction of the wave occurs mainly.

The reception of the seismic wave is received using a three-component (vertical component 1, horizontal component 2) clamping geophone. In the case of longitudinal waves, it is mainly recorded in the vertical component of the geophone, and in the case of transverse waves, it is mainly recorded in the horizontal component, and it shows the phase change according to the direction of impact of the transverse wave. do.

The P wave propagates in the direction of propagation and vibration parallel to each other, and becomes a P wave and a converted SV wave when reflected and refracted at the interface. The S wave propagates in the direction of propagation and the vibration at right angles. When their direction is perpendicular to the horizontal direction, it is called the SH wave, and when it is perpendicular to the vertical direction, it is called the SV wave. When the refraction of the S wave is reflected at the interface, the SV wave is converted into an SV wave and a converted P wave, but since the SH wave is not converted at the interface, it maintains its own properties.

There are several ways to generate S-waves, among which Puzyrev et al. (1966) loads explosives in three holes and sequentially explodes. Stslab, and Beeston et al. (1977) both face right-angled plates. As a non-explosive epicenter that strikes horizontally, it is used for Marthor, oil exploration, etc., and is widely known as horizontal vibrosies.

The dynamic coefficient is calculated by using Equation 1 below using the density value (ρ) obtained from the indoor test or the field density test.

The downhole seismic survey according to the prior art is as shown in a schematic diagram in FIGS. 1 and 2. At this time, a wooden plate is used as a plate to which an impact is applied, but this wooden plate has a problem of insufficient durability.

In addition, referring to FIG. 2, in the case of a wooden plate, the generated waveform (signal) becomes poor. As a result of insufficient elasticity of the plate, energy transmission is insufficient when hitting a hammer, which is the basis for exploratory analysis and initiates a very important signal. (Initial vibration) It was difficult to define the time.

In addition, the effect of the elastic wave generated due to the lack of gripping force is insufficient to cause slipping on the surface, and excessive impact is applied to generate the elastic wave, thereby causing safety problems such as debris and hammer slipping.

Patent Registration 10-0745036

The object of the present invention is to solve this problem, it is possible to reliably define the initial start (initial vibration) time of the signal by ensuring that energy transmission is reliably achieved when hitting the hammer, and it is safe by preventing slip and debris generation. It is to provide a shear wave generator for exploring downhole seismic waves that can prevent accidents in advance.

As a specific means for achieving the above object, the present invention, the base plate of the metal material that is in close contact with and seated on the ground to transmit the shear wave to the ground for seismic survey; A striking plate which is connected to the left and right sides of the base plate and transmits a shear wave generated by the blow to the base plate; An air gun for loading and firing the hammer bullet so that the hammer bullet accelerated by air pressure collides with the striking plate to generate a shear wave; And an induction pipe guiding the bullet for the hammer fired by the air gun to the striking plate.

At this time, a plurality of spikes may be provided on the bottom surface of the base plate to be inserted into the ground to adhere to a fixed position.

At this time, the hitting plate may be provided with a target inclined surface so that a repulsive force is formed upward after the hammer bullet collides.

At this time, in the air gun, a first chamber and a second chamber in which high pressure gas is filled are formed, and an ejection passage through which high pressure gas is ejected is formed between the first chamber and the second chamber, and the first chamber is provided with high pressure gas. The main body is formed of a high pressure gas supply path for supplying; The first cap and the second cap corresponding to each chamber are formed to prevent the high-pressure gas outlets of the first chamber and the second chamber, and the first cap is in close contact with the inside of the outlet of the first chamber and the first The 2 caps are in close contact with the outside of the outlet of the second chamber, and the first cap and the second cap are connected by a connecting rod to be integrally operated, and the first chamber and the second chamber communicate with each other to fill high pressure gas. A cap member having a connection passage formed in the center of the connecting rod to be possible; And one end is in communication with the first chamber, the other end is in communication with the first chamber of the first cap, the valve is provided between them, the valve member is provided by the operation of the valve to move the cap member to the first It may include; a trigger for controlling the chamber and the second chamber is opened and the high-pressure gas inside thereof is ejected through the ejection passage and the induction pipe.

At this time, the valve may be a solenoid valve.

In this case, when the high-pressure gas is ejected from the first chamber and the second chamber to the ejection passage, a separation membrane installed between the outlets of the first and second chambers may be further included so as not to interfere with each other.

At this time, it may further include a stopper installed to control the rotation angle of the guide tube.

At this time, after the hammer bullet hits the hitting plate, an outlet through which the remaining high-pressure gas is discharged may be formed.

At this time, the connection portion of the air gun and the induction pipe is made of the induction pipe is rotatably installed in the fixed pipe, the fixed pipe is fixed to communicate with the jet passage through which the high pressure gas of the air gun is ejected, the induction pipe is the A part of the inside of the fixed tube is rotatably inserted and may have a smaller diameter than the fixed tube.

At this time, the inside of the fixed pipe is coated so that the thickness of the silicone increases linearly with angle, an air vent communicating between the fixed pipe and the guide pipe is formed in a portion of the guide pipe inserted into the fixed pipe, and the air vent When the induction pipe is horizontal, it is completely covered and sealed with the silicone, and as the induction pipe is erected vertically, it can be opened and reloaded by dropping the bullet for the hammer.

According to the present invention as described above has the following effects.

(1) The present invention can easily define the initial (initial oscillation) time by improving the elastic wave signal by ensuring that energy transmission is reliably achieved when the hammer is hit.

(2) The present invention can prevent the occurrence of safety accidents by preventing the occurrence of slipping and debris.

1 is a schematic diagram of a top-down seismic layer according to the prior art and a plate.
Figure 2 is a wave propagation pattern of the PS wave generated by the prior art and the superpolar polarity change of the signal for each receiving component in the borehole.
FIG. 3 is a schematic diagram of seismic exploration using a shear wave generator for downhole seismic exploration according to the present invention.
4 is an exploded plan view of a shear wave generator for exploring downhole seismic waves according to the present invention.
5 is a plan view of a shear wave generator for downhole seismic exploration according to the present invention.
6 and 7 are front views of a shear wave generator for downhole seismic survey according to the present invention, FIG. 6 shows before operation and FIG. 7 shows after operation.
8 is a detailed cross-sectional view of part A shown in FIG. 7.
9 to 11 are cross-sectional views of different embodiments of an air gun which is a component of a shear wave generator for downhole seismic survey according to the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art to which the present invention pertains may easily practice. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. In the drawings, parts not related to the description are omitted in order to clearly describe the present invention, and the same reference numerals are attached to the same or similar elements throughout the specification.

In this specification, terms such as “include” or “have” are intended to indicate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, and one or more other features. It should be understood that the presence or addition possibilities of fields or numbers, steps, actions, components, parts or combinations thereof are not excluded in advance. In addition, when a part such as a layer, film, region, plate, etc. is said to be "above" another part, this includes not only the case "directly above" another part but also another part in the middle. Conversely, when a portion of a layer, film, region, plate, or the like is said to be “under” another portion, this includes not only the case “underneath” another portion, but also another portion in the middle.

Hereinafter, a shear wave generator 1 for downhole seismic survey according to an embodiment of the present invention will be described in detail with reference to the drawings.

The shear wave generator 1 for downhole seismic survey according to the first embodiment of the present invention, referring to FIGS. 3 to 11, the base plate 10, the striking plate 20, the air gun 110, induction Includes tube 120.

Referring to FIG. 3, as shown, the shear wave generator 1 for downhole seismic survey according to the present invention invents a portion that generates shear waves. That is, the rest is almost the same as in the prior art. In the borehole 2, a receiver 14 is installed through the cable 13, and an electric field unit 12 including a control unit is installed on the ground to perform recording operations. At this time, the operator can stand on the upper surface of the base plate 10 and control the solenoid valve 116 using the switch 11 while pressing the plate 10 with his own weight to facilitate the work.

3 to 7, the base plate 10 is adhered to and seated on the ground so that shear waves can be transmitted to the ground for seismic survey.

At this time, referring to FIG. 3, since the operator presses the base plate 10 with its own weight, a member having a separate load is not required. Of course, if more load is needed, it will be possible to add more weight.

At this time, the base plate 10 may be provided with a plurality of spikes 120b inserted into the ground to adhere to a fixed position. The plurality of spikes 120b may be formed in a wedge shape with a lower end so as to be inserted into the ground, and may be disposed to be evenly distributed on the lower surface of the base plate 10.

At this time, it is necessary to increase the durability of the base plate 10, and for this purpose, an aluminum alloy resistant to impact may be applied. In addition, it would be desirable to manufacture it in an exchangeable form for easy maintenance. By applying the metal plate 10 in this way, since energy transfer is easily performed, accurate and stable waveform generation can be expected, and an increase in frequency characteristics can also be expected. In addition, the inside of the base plate 10 can be made hollow to reduce the weight, and this makes transportation very easy.

The striking plate 20 is connected to the left and right sides of the base plate 10 with reference to FIGS. 3 to 7 and transmits the shear wave generated by the striking to the base plate 10.

At this time, the hitting plate 20 may be provided with a target inclined surface 20a such that a hammer bullet (1-3 kg) collides and then a repulsive force is formed upward. When the target inclined surface 20a is provided in this way, the movement of the hammer bullet will change little by little depending on the angle of the inclined surface, but since the vertical component vector of the inclined surface exists anyway due to the sum of the vector forces, the bullet for the hammer is upward. You will be provided with the power to move in the direction.

At this time, the target inclined surface 20a may be formed of a curved surface in which the inclination increases or decreases, rather than a flat surface.

At this time, the striking plate 20 may be disposed on the left and right sides of the metal plate 10, and will also be able to apply an aluminum alloy resistant to impact. Accordingly, since the P wave is generated due to the reaction of the rising force when hitting, the P wave and the S wave are simultaneously generated.

The air gun (110, 210, 310), referring to Figures 3 to 11, the hammer bullets accelerated by the air pressure to the striking plate 20 collides with the hammer bullets to generate shear waves The 130 can be loaded and fired.

At this time, the air gun 110 may include a body 111, a gap member 113, and triggers 114,116.

At this time, the main body 111, the first chamber (111a) and the second chamber (111b) is filled with high-pressure gas is formed, and the high-pressure gas between the first chamber (111a) and the second chamber (111b) An ejection passage 111c to be ejected is formed, and a high pressure gas supply passage 115 for supplying high pressure gas may be formed in the first chamber 111a.

At this time, the main body 111, as shown in Figs. 9 to 11, is formed in a cylindrical shape with a long longitudinal direction, the first chamber (111a) and the second chamber (111b) is formed at each end, the Spaced apart, the jet passage 111c is formed perpendicular to the longitudinal direction. Therefore, since the high pressure gas of the first chamber 111a and the second chamber 111b is ejected and bent in the vertical direction, it is necessary to consider the flow of the high pressure gas for this part. For this purpose, referring to FIGS. 10 and 11, the first chambers 211a and 311a do not interfere with each other when high pressure gas is ejected from the first chambers 211a and 311a and the second chambers 211b and 311b to the jet path. ) And a separation membrane installed between the outlets of the second chambers 211b and 311b may be installed.

The cap member 113, the first cap (113a) and the second cap (113b) corresponding to each chamber to prevent the high-pressure gas outlet of the first chamber (111a) and the second chamber (111b) It is formed, the first cap is in close contact with the inside of the outlet of the first chamber (111a), the second cap (113b) is in close contact with the outlet outside of the second chamber (111b), the first cap (113a) And the second cap (113b) is connected by a connecting rod (113c) to be integrally acting, and the connecting rod (113c) so that the first chamber (111a) and the second chamber (111b) communicate to fill the high-pressure gas ) A connection passage 113d is formed in the center.

The trigger (114, 116), one end is in communication with the first chamber (111a) and the other end is in communication with the first chamber (111a) of the first cap (113a) in close contact with the valve between them, the valve (116) By being provided, the cap member 113 is moved by the operation of the valve 116, so that the first chamber 111a and the second chamber 111b are opened, and the high-pressure gas therein is connected to the ejection passage 111c. It is controlled to eject through the induction pipe 120.

At this time, the valve may apply a solenoid valve 116.

The guide tube 120 guides the bullet 130 for a hammer fired by the air gun 110 to the striking plate 20.

At this time, the stopper 140 may be installed on the body 111 of the air gun 110 so as to control the rotation angle of the guide tube 120.

At this time, after the bullet 130 for the hammer hits the striking plate 20, an outlet 120a through which the remaining high-pressure gas is discharged inside the induction pipe 120 may be formed. The remaining gas is discharged through the outlet 120a to assist the force in which the induction pipe 120 is vertically erected by its propulsion force.

In this case, referring to FIGS. 7 and 8, the connecting portion 121 of the air gun 110 and the induction pipe 120 is formed by rotating the rotating portion 121a of the induction pipe in a fixed pipe 121b so as to be rotatable. However, the fixed pipe 121b is fixed to communicate with the jet passage 111c through which the high pressure gas of the air gun 110 is ejected, and the rotating part 121a of the induction pipe is part 121a inside the fixed pipe 121b Is inserted to be rotatable and may be made to have a smaller diameter than the fixed tube (121b).

Here, the fixing pipe 121b is made of a form fixed to the air gun body 111, and the rotating portion 121a of the induction pipe is inserted and rotated. When pressure is applied, the connecting portion 121 It must be configured so that the high pressure gas can be completely blown out by being sealed. This is the diameter of the fixed pipe 121b decreases as it goes toward the end of the connecting portion, and conversely, the rotating portion 120a of the induction pipe increases in diameter, so that when the high pressure gas is moved, the rotating portion 121a of the induction pipe is separated from the fixed pipe 121b. It is pushed in the direction, the end of the rotating portion (121a) of the induction pipe is caught at the end of the fixed pipe (121b), and a sealing member is installed between them to be sealed to achieve the object. On the contrary, if the pressure is lowered because the high-pressure gas escapes, the induction pipe 120 may be rotatable while being separated from the sealing member.

At this time, referring to Figures 7 and 8, the inside of the fixed tube (121b) is coated with a silicone (121d) is linearly increased in thickness depending on the angle, the rotating portion inserted into the fixed tube (121b) of the guide tube An air vent 121c communicating between the fixed tube 121b and the rotating part 121a is formed in 121a, and the air vent 121c is connected to the silicon 121d when the induction tube 120 is horizontal. It is completely covered and sealed, and as the induction pipe 120 is erected vertically, the hammer bullet 130 for the hammer can descend and reload.

For this reason, the induction pipe 120 is preferably made of a material capable of simple stacking and reducing friction of the hammer bullet 130.

Referring to FIG. 3, the operator stands on the upper surface of the base plate 10 to operate the solenoid valve 116 of the air gun 110 using the switch 11. The bullet 130 for the hammer of the air gun 110 hits the striking plate 20, and the P wave and the S wave are generated by the hit and transmitted to the base plate 10. The shear wave generated in this way is recorded by the electric field unit 12.

Referring to Figure 4 and 5, the base plate 10, the left and right hitting plate 20 is assembled and assembled, each of the air gun 110 is installed so as to hit each hitting plate (20). Therefore, according to the operation of the air gun 110, the hammer bullet 130 strikes each striking plate 20 to generate shear waves. Accordingly, the receiver 14 receives the shear wave and transmits it to the electric field unit 120 to analyze it.

6 and 7, the high pressure gas of the air gun 110 triggers the bullet 130 for the hammer toward the striking plate 20 by controlling the solenoid valve 116 of the trigger using the switch 11 Will hit. When the bullet 20 for the hammer hits the striking plate 20, the induction pipe 120 is rotated upward by the inclined surface 20a, and at the same time, the remaining high pressure gas is discharged through the outlet 120a while the induction pipe 120 is discharged. ) To assist the rotation. At this time, the rotation angle of the guide tube 120 is vertically limited by the stopper 140. Then, when the guide tube 120 is erected vertically, the hammer bullet 130 is reloaded by descending by its own weight and returning to the original position.

Referring to FIGS. 7 and 8, when the hammer bullet 130 is reloaded, the air behind the hammer bullet 130 must have a structure to escape. Therefore, as shown in FIG. 8, between the fixed tube 121b and the rotating part 121a of the guide tube, silicone 121d is applied to increase the thickness, and the air vent 121c of the guide tube 120 is rotated. By moving it, the air can be removed or sealed. That is, if the induction pipe 120 is horizontal, it is sealed, and the air vent 121c is opened as the induction pipe 120 is vertically erected.

9 to 11, cross sections of air guns 110, 210, and 310 are shown by slightly different embodiments. The main body 111, 211, 311 of the air gun is provided with a first chamber (111a, 211a, 311a) and a second chamber (111b, 211b, 311b), in between the jet passages (111c, 211c, 311c) It is formed and the ejection passages 111c, 211c, 311c are connected and communicated with the guide tube 120 via the fixed tube 121b. Triggers 114, 214, and 314 controlled by solenoid valves 116, 216, and 316 are installed in the first chambers 111a, 211a, 311a, and triggers 114, 214, 314 are the solenoids. The first communication path communicating the inside of the valves 116, 216, 316 and the first chambers 111a, 211a, 311a and the solenoid valves 116, 216, 316 and the cap member 113, 213, 313 It includes a second communication path communicating with the inner surface of the first chamber of the first cap (113a, 213a, 313a). Accordingly, when the solenoid valves 116, 216, and 316 are opened, the balance of pressure between the first chamber and the second chamber is broken, and the cap members 113, 213, and 313 move to eject high pressure gas therein. Also, in the first chamber, injection passages 115, 215, and 315 for injecting high-pressure gas are connected to the outside to be filled. In addition, connection passages 113d, 213d, and 313d of the connecting rods 113c, 213c, and 313c of the cap members 113, 213, and 313 are formed. Accordingly, the first chamber and the second chamber maintain a pressure balance.

At this time, when a high pressure gas is injected through the injection passages 115, 215, and 315, the first caps 113a, 213a, and 313a are pushed in close contact with the inside of the first chamber, and the first chamber pressure increases. Then, the high pressure gas fills the second chamber through the connecting passages 113d, 213d, 313d of the connecting rods 113c, 213c, 313c, and when the pressure reaches the high pressure gas, the supply of the high pressure gas is no longer provided. This will not happen.

When the solenoid valves 116, 216, and 316 are opened in this state, the first communication paths 114a, 214a, 314a and the second communication paths 114b, 214b, 214b communicate with each other, and the first chamber 111a , 211a, 311a) and the second chamber 111b, 211b, 311c, the pressure balance is broken, the cap members 113, 213, 313 move to the left in the drawing, and the first chamber and the second chamber are rapidly opened, and therein High pressure gas is blown out in an instant through the eruption passages 111c, 211c, 311c.

Referring to FIG. 9, it can be seen that the ejection passage 111c is vertically formed with respect to the longitudinal direction. Referring to FIG. 10, a separation membrane 211d is installed at the starting point of the ejection passage 111c to eject high pressure. It is in a state where the vortex rate can be prevented by guiding the gas. Therefore, by suppressing the generation of vortex, smooth and rapid ejection of high pressure gas is achieved. In addition, it is possible to suppress the generation of fine vortices by treating the inner surface of the ejection passage 211c with a curved surface. Referring to FIG. 11, the separation membrane 311d is installed, but the vortex generation is sufficiently suppressed while the surface of the ejection passage 311c is not cured, and is an advantageous embodiment in terms of manufacturing and cost.

Although one embodiment of the present invention has been described above, the spirit of the present invention is not limited to the embodiments presented herein, and those skilled in the art to understand the spirit of the present invention may add elements within the scope of the same spirit. However, other embodiments may be easily proposed by changing, deleting, adding, or the like, but it will also be considered to be within the scope of the present invention.

1: Shear wave generator for exploring downhole seismic waves
2: borehole 10: base plate
11: switch 12: electronics
13: cable 14: receiver
20: striking plate 110: air gun
111: main body 113: cap member
114: communication path 115: high pressure gas supply path
116: solenoid valve 120: induction pipe
130: hammer bullet 140: stopper

Claims (10)

A base plate made of a metal material in close contact with and seated on the ground to transmit shear waves to the ground for seismic survey;
A striking plate which is connected to the left and right sides of the base plate and transmits a shear wave generated by the blow to the base plate;
An air gun for loading and firing the hammer bullet so that the hammer bullet accelerated by air pressure collides with the striking plate to generate a shear wave;
An induction pipe guiding the bullet for the hammer fired by the air gun to the striking plate;
Shear wave generator for downhole seismic survey comprising a. According to claim 1,
A shear wave generator for exploring downhole seismic waves with a plurality of spikes inserted into the ground to adhere to a fixed position on the lower surface of the base plate. According to claim 1,
A shearing wave generator for exploring downhole seismic waves provided with a target inclined surface so that a repulsive force is formed on the striking plate after the bullet for the hammer collides. According to claim 1,
The air gun,
A first chamber and a second chamber in which high pressure gas is filled are formed, and an ejection passage through which high pressure gas is ejected is formed between the first chamber and the second chamber, and the first chamber is a high pressure gas for supplying high pressure gas. The main body is formed with a supply path;
The first cap and the second cap corresponding to each chamber are formed to prevent the high-pressure gas outlets of the first chamber and the second chamber, and the first cap is in close contact with the inside of the outlet of the first chamber and the first The 2 caps are in close contact with the outside of the outlet of the second chamber, and the first cap and the second cap are connected by a connecting rod to be integrally operated, and the first chamber and the second chamber communicate with each other to fill high pressure gas. A cap member having a connection passage formed in the center of the connecting rod to be possible;
One end is in communication with the first chamber, the other end is in communication with the first chamber of the first cap, and a valve is provided between them, so that the cap member moves by the operation of the valve to move the first chamber. And a second chamber open and a trigger for controlling high-pressure gas inside thereof to eject through the ejection passage and the induction pipe;
Shear wave generator for the downhole seismic wave exploration comprising a. According to claim 4,
The valve is a solenoid valve, a shear wave generator for exploring downhole seismic waves. According to claim 4,
A shear wave generator for downhole seismic probes further comprising a separation membrane installed between the outlets of the first and second chambers so as not to interfere with each other when ejecting high pressure gas from the first chamber and the second chamber to the ejection passage. According to claim 1,
Shear wave generator for downhole seismic probe further comprises a stopper installed to control the rotation angle of the guide tube. According to claim 1,
After the hammer bullet hits the striking plate, a shear wave generator for exploration of a downhole seismic wave having an outlet through which the remaining high-pressure gas is discharged inside the induction pipe. According to claim 1,
The connecting portion of the air gun and the induction pipe is made of the induction pipe being rotatably installed in a fixed pipe, the fixed pipe is fixed to communicate with a jet passage through which the high pressure gas of the air gun is ejected, and the induction pipe is inside the fixed pipe Shear wave generator for elasticity of the downhole having a diameter smaller than the fixed tube inserted in a part rotatable. The method of claim 9,
The inside of the fixed tube is coated so that the thickness of the silicone increases linearly with angle, an air vent communicating between the fixed tube and the guide tube is formed in a portion of the guide tube inserted into the fixed tube, and the air vent is the When the induction pipe is horizontal, it is completely covered and sealed with the silicone, and the shearing wave generator for exploring downhole seismic waves in which the bullet for the hammer descends and reloads by opening as the induction pipe is erected vertically.

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