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

Abstract

The utility model 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 isolation surface is arranged on 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. The semi-explosive shear wave source realizes near-field waveform regulation and control on a high-pressure gas detonation pressure field through structural design, performs near-field waveform regulation and control on the pressure field generated by detonation through structural design of the detonation tube, enables the energy proportion of a generated shear wave signal to be amplified, is a brand-new shear wave source generation way, and can be applied to the field of high-pressure gas detonation. 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 utility model relates to high-pressure gas detonation technology, specifically to a semi-explosive shear wave source based on high-pressure gas explosion near-field waveform modulation. Background Technology

[0002] Shear wave exploration is an important geological exploration method. In seismic exploration, compared with P-wave exploration, shear wave exploration has many unique advantages, such as obtaining higher resolution data. However, generating shear waves is much more difficult than generating P-waves, and existing shear wave sources still cannot meet the needs of exploration.

[0003] The most widely used shear wave controlled seismic source is installed on a specific seismic source vehicle, which can generate controllable shear wave signals and has been applied in shallow geological exploration. However, due to limitations in driving capacity and ground coupling efficiency, the generated shear wave energy is limited, the shear wave signal is weak, and the effective detection range and depth are restricted. Furthermore, the seismic source vehicle must be able to travel, which also limits its field operation capabilities to some extent.

[0004] Existing gas-explosion seismic sources release energy through gas detonation reactions, generating vibrations in the ground and producing relatively good P-wave signals. However, without improved design, the resulting S-wave signals are very weak and cannot be used for geological exploration. Patent Cn201921730867.7 discloses a gas-explosion S-wave source excitation device, but because its gas storage chamber cannot move and accelerate, it cannot achieve the purpose of directional energy excitation, and experiments have shown that it is difficult to generate S-waves. Patent Cn202111595135.3 discloses another type of seismic source that generates S-waves by torsion. This device is not only structurally complex, but also has a very low S-wave conversion efficiency. Our previously proposed impact-type S-wave source is a better S-wave source, and it can obtain good S-wave signals in experiments. However, its use requires trenching, making construction difficult, and the device itself is relatively bulky, making it difficult to use on a large scale. Summary of the Invention

[0005] The purpose of this utility model is to provide a semi-explosive shear wave source based on high-pressure gas explosion near-field waveform modulation, thereby solving the above-mentioned problems.

[0006] In order to achieve these objectives and other advantages according to the utility model:

[0007] A semi-explosion shear wave source based on high-pressure gas explosion near-field waveform control includes a cylindrical detonation tube with a gas chamber inside. One side of the gas chamber is an arc-shaped surface with its central axis aligned with the detonation tube. The other side of the gas chamber is an isolation surface. A groove aligned with the extension direction of the detonation tube is provided on the tube wall near the isolation surface, forming a waveform control chamber. An annular groove is provided on the tube wall near the arc-shaped surface. Both ends of the detonation tube are end caps, one of which has a gas injection port and an igniter inlet port.

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

[0009] Furthermore, the cross-section of the air chamber is semi-circular, the isolation surface is square, 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 plane of symmetry in the width direction of the waveform control chamber coincides with the plane of symmetry of the arc-shaped surface.

[0012] Furthermore, the annular groove is square.

[0013] Furthermore, the end cap is welded and fixed to the detonation tube.

[0014] The beneficial effects of this utility model are as follows: The detonation tube is divided into two parts. One part is a high-pressure gas chamber filled with explosive gas, such as methane. Grooves are designed on the outer wall of the tube on the side of the gas chamber. After the explosion, the chamber ruptures from the grooves. 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 presence 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. This utility model realizes a semi-explosion-type shear wave source for near-field waveform control of the pressure field of high-pressure gas detonation through structural design. By controlling the pressure field generated by the detonation through the structural design of the detonation tube, the energy ratio of the shear wave signal generated is amplified. This is a brand-new way to generate shear wave sources. It has the characteristics of strong shear wave signal, environmental protection, good economy, and good field adaptability. Compared with impact-type shear wave sources, this source is deployed vertically, similar to the construction of general gas explosion longitudinal wave sources. It does not require transverse grooving, greatly reducing the construction difficulty and cost.

[0015] Other advantages, objectives and features of the utility model will be apparent in part from the description which follows, and in part from the understanding of those skilled in the art through study and practice of the utility model. Attached Figure Description

[0016] Figure 1 Schematic diagram of the utility model Figure 1 ;

[0017] Figure 2 Schematic diagram of the utility model Figure 2 ;

[0018] Figure 3 This is a cross-sectional view of the utility model.

[0019] Figure 4 This is a pressure distribution diagram after an explosion. Detailed Implementation

[0020] The utility model will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0021] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. The following description relates to...

[0022] In the accompanying 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. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this specification as detailed in the appended claims.

[0023] The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of this specification. The singular forms “a,” “the,” and “the” as used in this specification and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any and all possible combinations of one or more of the 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 information of the same type from one another. For example, without departing from the scope of this specification, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to determination."

[0025] The approach to solving the problem using utility models:

[0026] A semi-explosive shear wave source based on high-pressure gas explosion near-field waveform control includes a cylindrical detonation tube 100, a gas chamber 200 inside the detonation tube 100, an arc-shaped surface 201 on one side of the gas chamber 200 with its central axis aligned with the detonation tube 100, and an isolation surface 202 on the other side of the gas chamber 200. A groove aligned with the extension direction of the detonation tube is provided on the tube wall of the detonation tube 100 near the isolation surface 202, forming a waveform control chamber 300. An annular groove 101 is provided on the tube wall of the detonation tube 100 near the arc-shaped surface 201. End caps are provided at both ends of the detonation tube 100, including an upper end cap 403 and a lower end cap 404. The upper end cap 403 is provided with a gas injection port 401 and an igniter inlet port 402.

[0027] The width of the waveform control chamber 300 is greater than two-thirds of the diameter of the arc-shaped surface 201. The cross-section of the gas chamber 200 is semi-circular, and the isolation surface 202 is square. An isolation wall 102 separates the gas chamber 200 and the waveform control chamber 300. The thickness of the isolation wall 102 needs to be moderate to ensure that it has the ability to resist large deformations in the event of a gas explosion. The square shape of the isolation surface 202 also facilitates processing and is aesthetically pleasing.

[0028] The symmetry plane of the waveform control chamber 300 in the width direction coincides with the symmetry plane of the arc-shaped surface 201. This design is mainly for aesthetic purposes and also facilitates manufacturing.

[0029] The annular groove 101 is square, allowing a window to be opened to release pressure waves after rupture. The end cap 400 is fused and fixed to the detonation tube 100. This ensures the fixation of the end cap 400 and the detonation tube 100, and guarantees gas discharge at the annular groove 101.

[0030] This seismic source requires several auxiliary systems to operate. These include a gas detonation reaction ignition system and a gas injection system. The ignition system uses an electric spark generator, installed on the upper end cap 403 of the detonation tube 100, and uses gas sealing technology to seal the screw holes. The gas injection system includes fastening screws (with gas seals), gas conduits, valves, and a gas pressure gauge. After the main unit is installed, the gas injection valve is opened to inject working gas from the gas tank. Since there are usually two types of reaction gases, the valves must control the sequential intake of the two gas conduits, and the gas injection rate is controlled by the gas pressure gauge.

[0031] The utility model utilizes the cavity structure of the waveform control chamber 300 to modulate the pressure field after a gas explosion. Due to the presence 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, such as... Figure 4As shown, since the secondary shear wave is near the explosion point, the proportion of shear wave energy generated can be relatively high. In principle, the larger the cavity, the stronger the asymmetry, and the higher the proportion of shear wave. However, in practice, the design of the isolation wall 102 requires that its thickness be sufficient to resist deformation, which reduces the size of the waveform control chamber 300 to some extent. But it also ensures that the cavity will not fail quickly. Therefore, in the design, the configuration of the waveform control chamber 300 and the isolation wall 102 can be moderate, ensuring that the isolation wall 102 resists deformation during blasting while also making the waveform control chamber 300 large enough. Calculating the deformation resistance of the isolation wall 102 during blasting is a relatively existing technology, which will not be elaborated on in the utility model.

[0032] Although the embodiments of the utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A semi-blast transverse wave seismic source based on high-pressure gas blast near-field waveform regulation, characterized in that, The application relates to a cylindrical detonation tube, which is provided with a gas chamber, one side of the gas chamber is an arc surface, the central axis of the arc surface is consistent with the detonation tube, the other side of the gas chamber is a separation 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 separation surface, a wave-shaped regulation chamber is formed, a ring-shaped groove is arranged on the side of the tube wall of the detonation tube close to the arc surface, and a head is arranged at both ends of the detonation tube, a gas injection hole and an igniter access hole are arranged on one end of the head.

2. The half-blast transverse wave seismic source based on high-pressure gas-blast near-field waveform regulation of claim 1, wherein, The width of the wave-shaped regulation chamber is greater than two-thirds of the diameter of the arc surface.

3. The half-blast transverse wave seismic source based on high-pressure gas-blast near-field waveform regulation of claim 1, wherein, The cross section of the gas chamber is semicircular, the separation surface is a square surface, and a separation wall is arranged between the gas chamber and the wave-shaped regulation chamber.

4. A semi-blast transverse wave seismic source based on high-pressure gas-blast near-field waveform regulation according to any one of claims 1-3, characterized in that, The symmetric surface of the width direction of the wave-shaped regulation chamber is consistent with the symmetric surface of the arc surface.

5. The half-charge transversal wave seismic source based on high-pressure gas-charge near-field waveform regulation of claim 1, wherein, The ring-shaped groove is square.

6. The half-charge transversal wave seismic source based on high-pressure gas-charge near-field waveform regulation of claim 1, wherein, The head is fixedly connected with the detonation tube through fusion.

Images