Half-explosion shear wave source based on high-pressure gas explosion near-field waveform regulation and control

Abstract

The invention discloses a semi-explosion type transverse wave source based on high-pressure gas explosion near-field waveform regulation and control, which comprises a cylindrical detonation tube, a gas chamber is arranged in the detonation tube, one side of the gas chamber is an arc-shaped surface, the central axis of the arc-shaped surface is consistent with that of the detonation tube, the other side of the gas chamber is an isolation surface, and the center axis of the isolation surface is consistent with that of the detonation tube. A groove consistent with the detonation tube in the extending direction is formed in the side, close to the isolation face, of the tube wall of the detonation tube to form a waveform regulation and control chamber, an annular notch groove is formed in the side, close to the arc-shaped face, of the tube wall of the detonation tube, and sealing heads are arranged at the two ends of the detonation tube. According to the semi-explosive transverse wave source, near-field waveform regulation and control on a high-pressure gas detonation pressure field are achieved through structural design, near-field waveform regulation and control are conducted on the pressure field generated by detonation through structural design of the detonation tube, the energy proportion of generated transverse wave signals is amplified, and the semi-explosive transverse wave source is a brand-new transverse wave source generation way; the system has the advantages of being strong in transverse wave signal, environmentally friendly, good in economical efficiency, good in field adaptability and the like.

Description

Technical Field

[0001] The invention relates to high-pressure gas detonation technology, and in particular to a semi-explosion type shear wave source based on high-pressure gas explosion near-field waveform regulation. Background Art

[0002] Shear wave exploration is an important means of geological exploration. In seismic exploration, shear wave exploration has many unique advantages compared with longitudinal wave exploration, and can obtain higher resolution data. However, the generation of shear waves is much more difficult than that of longitudinal waves, and the existing shear wave sources still cannot meet the needs of exploration.

[0003] The most commonly used shear wave controllable vibrator is installed on a specific vibrator vehicle, which can generate controllable shear wave signals and has been applied in shallow geological exploration. However, due to the limitations of driving capacity and ground coupling efficiency, the shear wave energy generated is limited, the shear wave signal is weak, and the effective range and depth of detection are limited. In addition, the vibrator vehicle must be passable during use, which also limits its field operation capabilities to a certain extent.

[0004] The existing gas explosion seismic source releases energy through the gas explosion reaction and generates vibrations in the earth, which can obtain better longitudinal wave signals. However, without improved design, the shear wave signal it generates is very weak and cannot be used for geological detection. Patent Cn201921730867.7 discloses a gas explosion shear wave seismic source excitation device. Since its gas storage cavity cannot move and accelerate, it cannot achieve the purpose of directional energy excitation. Experiments have shown that it is difficult to generate shear waves. Patent Cn202111595135.3 discloses another seismic source that relies on torsion to generate shear waves. This device is not only complex in structure, but also has low shear wave conversion efficiency. The impact-type shear wave seismic source we proposed earlier is a better shear wave seismic source. In the experiment, better shear wave signals can be obtained, but it requires trenching during use, which makes construction difficult. The device itself is relatively bulky and difficult to use on a large scale. Summary of the invention

[0005] The object of the present invention is to provide a semi-explosive shear wave source based on high-pressure gas explosion near-field waveform control to solve the above problems.

[0006] In order to achieve these objects and other advantages according to the present invention:

[0007] A semi-explosive shear wave source based on near-field waveform control of high-pressure gas explosion, comprising a cylindrical detonation tube, an air chamber arranged in the detonation tube, one side of the air chamber is an arc surface, the central axis of the arc surface is consistent with the detonation tube, the other side of the air chamber is an isolation surface, a groove consistent with the extension direction of the detonation tube is arranged on the side of the tube wall of the detonation tube close to the isolation surface, forming a waveform control chamber, an annular groove is arranged on the side of the tube wall of the detonation tube close to the arc surface, and heads are arranged at both ends of the detonation tube, and a gas injection hole and an igniter access hole are arranged on one end of the head.

[0008] Furthermore, the width of the waveform control chamber is greater than two-thirds of the diameter of the arc surface.

[0009] Furthermore, the cross section of the air chamber is semicircular, the isolation surface is a square surface, and there is an isolation wall between the air chamber and the waveform control chamber.

[0010] Furthermore, the thickness of the isolation wall.

[0011] Furthermore, the symmetry plane of the waveform control chamber in the width direction coincides with the symmetry plane of the arc surface.

[0012] Furthermore, the annular groove is square.

[0013] Furthermore, the end cap and the detonation tube are fixed by welding.

[0014] The beneficial effects of the present invention are as follows: the detonation tube is divided into two parts, one part is a high-pressure gas chamber, which is filled with explosive gas, such as methane, and the outer wall of the tube on the gas chamber side is designed with grooves. After the explosion, the cavity breaks from the grooves, and the other half of the detonation tube is a near-field waveform control chamber. The cavity structure of the waveform control chamber is used to modulate the pressure field after the gas explosion. Due to the existence of the cavity, the pressure wave generated by the detonation is forced to detour, thereby changing the symmetry of the near-field waveform and generating secondary shear waves. The present invention realizes a semi-explosion type shear wave source for near-field waveform control of the high-pressure gas detonation pressure field through structural design, and performs near-field waveform control on the pressure field generated by the detonation through the detonation tube structure design, so that the energy proportion of the shear wave signal generated by the detonation is amplified. It is a new way to generate a shear wave source, which has the characteristics of strong shear wave signal, environmental protection, good economy, good field adaptability, etc. Compared with the impact-type shear wave source, this source is deployed in a vertical well, which is similar to the construction of a general gas explosion longitudinal wave source, and does not require horizontal grooving, so the construction difficulty is greatly reduced and the cost can be greatly reduced.

[0015] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The structure of the present invention is schematically shown Figure 1 ;

[0017] Figure 2 The structure of the present invention is schematically shown Figure 2 ;

[0018] Figure 3 is a cross-sectional view of the present invention;

[0019] Figure 4 This is the pressure distribution diagram after an explosion. DETAILED DESCRIPTION

[0020] The present invention is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0021] Exemplary embodiments will now be described in detail, examples of which are shown in the accompanying drawings.

[0022] When the drawings are shown in the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this specification. Instead, they are only examples of devices and methods consistent with some aspects of this specification as detailed in the attached claims.

[0023] The terms used in this specification are for the purpose of describing specific embodiments only and are not intended to limit this specification. The singular forms "a", "the" and "the" used in this specification and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0024] It should be understood that although the terms first, second, third, etc. may be used in this specification to describe various information, this information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of this specification, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

[0025] Idea for solving the problem of the present invention:

[0026] A semi-explosive shear wave source based on near-field waveform control of high-pressure gas explosion, comprising a cylindrical detonation tube 100, wherein an air chamber 200 is arranged in the detonation tube 100, wherein one side of the air chamber 200 is an arc surface 201, wherein the central axis of the arc surface 201 is consistent with the detonation tube 100, and the other side of the air chamber 200 is an isolation surface 202, and a groove consistent with the extension direction of the detonation tube is arranged on the tube wall of the detonation tube 100 on the side close to the isolation surface 202, so as to form a waveform control chamber 300, and an annular groove 101 is arranged on the tube wall of the detonation tube 100 on the side close to the arc surface 201, and ends of the detonation tube 100 are provided with heads, including an upper head 403 and a lower head 404, wherein the upper head 403 is provided with a gas injection hole 401 and an igniter access hole 402.

[0027] The width of the waveform control chamber 300 is greater than two-thirds of the diameter of the arc surface 201. The cross section of the gas chamber 200 is semicircular, and the isolation surface 202 is a square surface. The isolation wall 102 is between the gas chamber 200 and the waveform control chamber 300. The thickness of the isolation wall 102 needs to be moderate to ensure that the isolation wall 102 has the ability to resist large deformation when the gas explodes. The isolation surface 202 is a square surface, which is convenient for processing and also more beautiful.

[0028] The symmetric plane of the width direction of the waveform control chamber 300 coincides with the symmetric plane of the arc surface 201. This design is mainly in line with aesthetics and is also convenient for processing.

[0029] The annular groove 101 is square, that is, after rupture, a window can be opened to release the pressure wave. The sealing head 400 and the detonation tube 100 are welded and fixed. The fixing effect of the sealing head 400 and the detonation tube 100 is ensured, and the gas is discharged at the annular groove 101.

[0030] This seismic source also requires some auxiliary systems when working. The auxiliary systems include a gas detonation reaction ignition system, a gas injection system, etc. The ignition system can use an electric spark generator, which is installed on the upper head 403 of the detonation tube 100, and uses gas sealing technology to seal the screw pores. The gas injection system includes fastening screws (with gas seals), gas ducts, valves, gas pressure gauges, etc. After the main device is installed, open the gas injection valve and inject working gas from the gas tank. Since the reaction gas is usually two types, this requires the valve to control the sequential intake of the two gas ducts, and the gas injection amount is controlled by the gas pressure gauge.

[0031] The present invention utilizes the cavity structure of the waveform control chamber 300 to modulate the pressure field after the gas explosion. Due to the existence of the cavity, the pressure wave generated by the explosion is forced to detour, thereby changing the symmetry of the near-field waveform and generating secondary transverse waves, such as Figure 4As shown, since the secondary shear wave is near the explosion point, the generated shear wave energy can account for a relatively high proportion. In principle, the larger the cavity, the stronger the asymmetry, and the higher the shear wave proportion, but in practice, the design of the partition wall 102, the thickness of the partition wall 102 needs to ensure anti-deformation, so the size of the waveform control chamber 300 is reduced to a certain extent, but it also ensures that the cavity will not fail quickly, so in the design, the configuration of the waveform control chamber 300 and the partition wall 102 can be moderate, which not only ensures the anti-deformation of the partition wall 102 during the explosion, but also makes the waveform control chamber 300 large enough. Calculating the anti-deformation of the partition wall 102 during the explosion is a relatively existing technology, and the present invention will not be repeated.

[0032] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A semi-explosive shear wave source based on high-pressure gas explosion near-field waveform control, characterized in that: It comprises a cylindrical detonation tube, wherein an air chamber is arranged in the detonation tube, one side of the air chamber is an arc surface, the central axis of the arc surface is consistent with the detonation tube, the other side of the air chamber is an isolation surface, a groove consistent with the extension direction of the detonation tube is arranged on the tube wall of the detonation tube on the side close to the isolation surface, forming a waveform control chamber, an annular groove is arranged on the tube wall of the detonation tube on the side close to the arc surface, and caps are arranged at both ends of the detonation tube, and a gas injection hole and an igniter access hole are arranged on one end of the cap.

2. A semi-explosive shear wave source based on high-pressure gas explosion near-field waveform control as claimed in claim 1, characterized in that: The width of the waveform regulating chamber is greater than two-thirds of the diameter of the arc surface.

3. A semi-explosive shear wave source based on high-pressure gas explosion near-field waveform control as claimed in claim 1, characterized in that: The cross section of the air chamber is semicircular, the isolation surface is a square surface, and a separation wall is between the air chamber and the waveform regulating chamber.

4. A semi-explosive shear wave source based on high-pressure gas explosion near-field waveform control as described in any one of claims 1 to 3, characterized in that: The symmetry plane of the waveform control chamber in the width direction coincides with the symmetry plane of the arc surface.

5. A semi-explosive shear wave source based on high-pressure gas explosion near-field waveform control as claimed in claim 1, characterized in that: The annular groove is square.

6. A semi-explosive shear wave source based on high-pressure gas explosion near-field waveform control as claimed in claim 1, characterized in that: The end cap and the detonation tube are welded and fixed.

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