A gas detonation source device capable of continuous operation

Abstract

The invention discloses a continuously working gas detonation source device, comprising a tubular detonation chamber and a reciprocating exhaust device fixed at the outlet end of the detonation chamber. The vacuum pump works to evacuate the detonation chamber to negative pressure, and the fuel and oxidant are respectively filled into the detonation chamber through the fuel intake pipe and the oxidant intake pipe according to a certain ratio. After the working conditions are met, the stop valve is closed to stop the intake, and the high-energy ignition head ignites the explosive mixture in the detonation chamber, generating a detonation wave and high-temperature and high-pressure gas and acting on the lower panel, and the lower cavity produces a downward displacement, releasing the gas and coupling with the surrounding medium to generate seismic waves. As the gas is released, the pressure in the cavity drops, and the lower cavity moves upward to re-form a closed space, and the vacuum pump works to start the next working cycle.

Description

Technical Field

[0001] The invention belongs to the technical field of geophysical exploration equipment, and in particular relates to a gas detonation source device which can work continuously and is applied underground and underwater. Background Art

[0002] Artificial seismic sources are important technical equipment in the field of geological exploration. Currently, commonly used artificial seismic sources include explosive seismic sources, electric spark seismic sources, air gun seismic sources and drop hammer seismic sources. Explosive seismic sources are the most commonly used seismic sources in geological exploration. They generate large amounts of energy, but the energy is not concentrated, which is dangerous and uncontrollable, and can cause significant pollution and damage to the environment. Electric spark seismic sources, air gun seismic sources and drop hammer seismic sources have low operating frequencies, poor continuity and controllability. These seismic sources are usually large in size, complex in structure, and expensive, making them difficult to operate in complex terrain areas such as mountainous areas.

[0003] The gas detonation source technology is based on the gas phase detonation theory. It forms a detonation by mixing gas fuel and oxidant in the detonation chamber and igniting them to produce a chemical reaction, generating detonation waves and high-temperature and high-pressure gas, which are coupled with the surrounding medium to produce seismic waves. The gas detonation source has good advantages in terms of the energy of the excitation seismic wave, the main frequency of the seismic wave, and the bandwidth, and has unique advantages in shallow seismic exploration and directional excitation of seismic waves. (Meng Chuanmin, Wang Xiang, Yin Chen, et al. Application of new gas explosion sources in seismic exploration [A]. Proceedings of the 2021 Geophysical Exploration Technology Seminar of the China Petroleum Society [C]. Geophysical Exploration Professional Committee of the China Petroleum Society, 2021.) At present, most gas detonation sources complete the filling of fuel and oxidant before deploying the gas source, and the source needs to be left to stand for several hours before the premixing can be successfully detonated. After the detonation, the source diaphragm ruptures or the pressure limiting valve falls off, and the high-pressure gas is released instantly to produce seismic waves. The main problems with existing gas detonation seismic sources are: (1) After the seismic source diaphragm ruptures or the pressure-limiting valve falls off, it needs to be replaced, which is cumbersome, increases working time, generates consumables costs, and increases operating costs; (2) A single seismic source device can only achieve single-shot firing underground and underwater. After firing once, the seismic source needs to be retracted, filled with gas, and left to stand for several hours before it can be fired a second time, which has low operating efficiency and poor economy; (3) The ratio of pre-filled fuel and oxidizer is fixed, and it is impossible to quickly adjust the seismic wave energy according to the results of the previous firing, and the environmental adaptability is poor. Summary of the invention

[0004] The present invention proposes a continuously working gas detonation source device, which can adjust the fuel and oxidant gas distribution ratio in real time according to the on-site operation results, realize on-site regulation of the firing energy, and improve the adaptability of the device to the application environment.

[0005] The technical solution to realize the present invention is: a continuously working gas detonation source device, comprising:

[0006] The detonation chamber is tubular as a whole and placed in a vertical direction. The tail of the detonation chamber is a circular opening. The top of the detonation chamber is closed. The first through hole, the second through hole and the third through hole arranged in a regular triangle shape and perpendicular to the top solid wall are opened on the top solid wall. The upper part of the side wall of the detonation chamber is provided with a threaded hole.

[0007] The reciprocating exhaust device is located at the lower end of the rear part of the detonation chamber, and is composed of an upper panel, an upper cavity, a lower cavity, a lower panel, a spring and a limit protection block. The upper panel is a circular thin plate, and a through hole is opened in the center of the upper panel. The aperture of the through hole is consistent with the outer diameter of the detonation chamber. The upper cavity is a cylindrical cavity, the lower cavity is a cylindrical cavity, the lower panel is a circular thin plate, the springs are symmetrically arranged on the outside of the cavity, and the limit protection block is composed of inner fan-shaped ribs and outer fan-shaped ribs.

[0008] Furthermore, the first through hole on the solid wall at the top of the detonation chamber is an exhaust hole, an exhaust pipe is welded on the outside of the exhaust hole, an anti-flashback valve and a stop valve are installed on the exhaust pipe, and the exhaust pipe is connected to a vacuum pump through an exhaust bellows.

[0009] Furthermore, the second through hole on the solid wall at the top of the detonation chamber is a fuel inlet hole, a fuel inlet pipe is welded to the outside of the fuel inlet hole, an anti-backfire valve and a shut-off valve are installed on the fuel inlet pipe, and the fuel inlet pipe is connected to the fuel gas cylinder through a fuel inlet bellows.

[0010] Furthermore, the third through hole on the solid wall at the top of the detonation chamber is an oxidant inlet hole, an oxidant inlet pipe is welded to the outside of the oxidant inlet hole, an anti-backfire valve and a stop valve are installed on the oxidant inlet pipe, and the oxidant inlet pipe is connected to the oxidant gas cylinder through an oxidant inlet bellows.

[0011] Furthermore, the threaded hole on the upper part of the side wall of the detonation chamber is used to install a high-energy ignition head. The high-energy ignition head needs to be thread-sealed after being threaded. The high-energy ignition head is connected to a high-energy igniter on the well or on the shore through a waterproof ignition line.

[0012] Furthermore, the lower end of the detonation chamber tail is embedded in the central through hole of the upper panel, and the outlet of the detonation chamber tail is flush with the lower surface of the upper panel. In order to enhance the connection strength, the detonation chamber tube wall and the upper and lower surfaces of the upper panel are fixedly connected by welding.

[0013] Furthermore, the inner diameter of the upper cavity is larger than the outer diameter of the detonation chamber, is coaxial with the detonation chamber, and is welded and fixedly connected to the lower surface of the upper panel.

[0014] Furthermore, the thickness and curvature of the inner fan-shaped ribs of the position-limiting protection block are the same as those of the upper cavity, and the upper end surface of the inner fan-shaped ribs is fixedly connected to the lower end surface of the upper cavity by welding.

[0015] Furthermore, the inner diameter of the lower cavity is the same as the outer diameter of the upper cavity, and the wall thickness is the same as the wall thickness of the upper cavity.

[0016] Furthermore, the thickness and curvature of the outer fan-shaped ribs of the limit protection block are the same as those of the lower cavity, the upper end of the outer fan-shaped ribs is welded and fixed to the lower surface of the upper panel, and the lower end is flush with the lower end of the inner fan-shaped ribs.

[0017] Furthermore, an annular groove is provided on the lower surface of the upper panel, and the inner and outer diameters of the annular groove are the same as the inner and outer diameters of the lower cavity.

[0018] Furthermore, the inner wall surface of the lower cavity fits the outer wall surface of the upper cavity and the outer wall surface of the inner fan-shaped ribs, and the outer wall surface of the lower cavity fits the inner wall surface of the outer fan-shaped ribs. The deepest part of the lower cavity can be embedded in the groove of the upper panel.

[0019] Furthermore, the outer diameter and thickness of the lower panel are the same as those of the upper panel, and the lower panel is welded and fixedly connected to the lower end surface of the lower cavity.

[0020] Furthermore, the upper end of the spring is connected to the lower surface of the upper plate, and the lower end is connected to the upper surface of the lower plate.

[0021] Furthermore, the number of the limit protection blocks is consistent with the number of springs and is arranged inside the springs. The limit protection blocks limit the vertical movement of the lower cavity, reduce the impact of explosion on the spring connection, and protect the spring.

[0022] Furthermore, when the spring is in a natural return state, the upper end of the lower cavity is embedded in the groove of the upper panel, and the detonation chamber, the upper cavity and the lower cavity form a closed space.

[0023] Furthermore, during the process of filling the detonation chamber, the upper cavity and the lower cavity with fuel and oxidant, the lower panel is affected by the filling pressure, and the lower cavity moves vertically downward. Under the action of the spring, the maximum displacement of the lower cavity does not exceed the height of the upper cavity.

[0024] Furthermore, the displacement of the lower cavity during detonation and exhaust does not exceed the height of the limit protection block.

[0025] Furthermore, the fuel is hydrogen or one of hydrocarbon gas fuels such as methane, acetylene, etc., and the oxidant is air or oxygen.

[0026] Compared with the prior art, the present invention has the following significant advantages:

[0027] (1) The device has no diaphragm or pressure-limiting valve at the outlet, and no parts need to be added or replaced after firing, which can reduce the operating procedures, save consumables, and reduce operating costs.

[0028] (2) After firing, the device can automatically form a closed space to quickly fire the next time, shortening the preparation time for the gas explosion source from several hours to a few minutes or even tens of seconds, greatly improving the operating efficiency.

[0029] (3) The device can adjust the fuel and oxidizer gas ratio in real time according to the on-site operation results, realize on-site regulation of the firing energy, and improve the adaptability of the device to the application environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure of the device of the present invention.

[0031] Figure 2 It is a schematic diagram of the arrangement of through holes at the top of the detonation chamber.

[0032] Figure 3 It is a structural schematic diagram of the upper panel of the reciprocating exhaust device and its fastening parts.

[0033] Figure 4 It is a structural schematic diagram of the lower panel of the reciprocating exhaust device and its fastening parts.

[0034] Figure 5 It is a schematic diagram of different stages of the working process of the present invention: vacuum state, fuel and oxidant filling state, and exhaust state.

[0035] Among them: 1. detonation chamber; 2. reciprocating exhaust device; 3. exhaust pipe; 4. fuel intake pipe; 5. oxidizer intake pipe; 6. high-energy ignition head; 7. upper panel; 8. limit protection block; 801. first fan-shaped fin; 802. second fan-shaped fin; 9. upper cavity; 10. lower cavity; 11. spring; 12 lower panel. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0038] In addition, in the present invention, the descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0039] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation" and the like should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; "connection" can be a mechanical connection or an electrical connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0041] The following will further introduce the specific implementation method, as well as the technical difficulties and inventive points of this invention in combination with this design example.

[0042] like Figure 1~Figure 5 As shown, a continuously operable gas detonation source device comprises a detonation chamber 1 and a reciprocating exhaust device 2.

[0043] The detonation chamber 1 is tubular as a whole and is placed in a vertical direction. The tail of the detonation chamber 1 is a circular opening, and the top of the detonation chamber 1 is closed. A first through hole, a second through hole and a third through hole are arranged in a regular triangle shape and perpendicular to the top solid wall. The first through hole on the top solid wall of the detonation chamber 1 is an exhaust hole, and an exhaust pipe 3 is welded to the outside of the exhaust hole. The exhaust pipe 3 is equipped with an anti-flashback valve and a stop valve, and is connected to a vacuum pump through an exhaust bellows. The second through hole on the top solid wall of the detonation chamber 1 is a combustion hole. The fuel inlet hole is welded to the outside of the fuel inlet hole with a fuel inlet pipe 4, which is equipped with an anti-flashback valve and a stop valve, and is connected to the fuel gas cylinder through a fuel inlet bellows; the third through hole on the top solid wall of the detonation chamber 1 is the oxidant inlet hole, and the oxidant inlet pipe 5 is welded to the outside of the oxidant inlet hole, which is equipped with an anti-flashback valve and a stop valve, and is connected to the oxidant gas cylinder through an oxidant inlet bellows; a threaded hole is opened on the upper part of the side wall of the detonation chamber 1, and a high-energy ignition head 6 is installed. The high-energy ignition head 6 needs to be thread-sealed after threaded connection, and the high-energy ignition head 6 is connected to the well or onshore high-energy igniter through a waterproof ignition line.

[0044] The reciprocating exhaust device 2 is located at the lower end of the rear of the detonation chamber 1, and includes an upper panel 7, an upper cavity 9, a lower cavity 10, a lower panel 12, a plurality of limit protection blocks 8 and a plurality of springs 11. The upper panel 7 is a circular thin plate, and a through hole is opened in the center of the upper panel 7, and the aperture of the through hole is consistent with the outer diameter of the detonation chamber 1; the lower panel 12 is a circular thin plate. The limit protection block 8 includes a first fan-shaped rib 801 and a second fan-shaped rib 802; the upper cavity 9 is a cylindrical cavity; the lower cavity 10 is a cylindrical cavity; the two springs 11 are symmetrically arranged outside the cavity, and the two ends of the spring 11 are respectively connected to the upper panel 7 and the lower panel 12; the lower end of the tail of the detonation chamber 1 is embedded in the central through hole of the upper panel 7, and the tail outlet of the detonation chamber 1 is flush with the lower surface of the upper panel 7. In order to strengthen the connection strength, the intersection of the detonation chamber 1 tube wall and the upper and lower surfaces of the upper panel 7 is fixedly connected by welding; the thickness and curvature of the first fan-shaped rib 801 of the limit protection block 8 are consistent with the lower cavity 10. The same; the upper end of the first fan-shaped rib 801 is welded and fixedly connected to the lower surface of the upper panel 7; the thickness and curvature of the second fan-shaped rib 802 of the limit protection block 8 are the same as those of the upper cavity 9, and the upper end surface of the second fan-shaped rib 802 is welded and fixedly connected to the lower end surface of the upper cavity 9; the lower end of the first fan-shaped rib 801 is flush with the lower end of the second fan-shaped rib 802; the inner diameter of the upper cavity 9 is greater than the outer diameter of the detonation chamber 1, is coaxial with the detonation chamber 1, and is welded and fixedly connected to the lower surface of the upper panel 7; the inner diameter of the lower cavity 10 is the same as the outer diameter of the upper cavity 9, and the wall thickness of the lower cavity 10 is the same as the wall thickness of the upper cavity 9; the lower surface of the upper panel 7 has an annular groove, an annular The inner and outer diameters of the groove are the same as those of the lower cavity 10; the inner wall surface of the lower cavity 10 fits the outer wall surface of the upper cavity 9 and the outer wall surface of the second fan-shaped rib 802, and the outer wall surface of the lower cavity 10 fits the inner wall surface of the first fan-shaped rib 801; the deepest part of the lower cavity 10 can be embedded in the groove of the upper panel 7; the outer diameter and thickness of the lower panel 12 are the same as those of the upper panel 7, and are welded and fixedly connected to the lower end surface of the lower cavity 10; the upper end of the spring 11 is connected to the lower surface of the upper panel 7, and the lower end is connected to the upper surface of the lower panel 12; the number of the limit protection blocks 8 is the same as the number of the springs 11 and is arranged on the inner side of the springs 11, and the limit protection blocks 8 limit the lower cavity 10 It moves in the vertical direction, weakening the impact of detonation on the connection of the spring 11 and protecting the spring 11; when the spring 11 is in a natural reset state, the upper end of the lower cavity 10 is embedded in the groove of the upper panel 7, and the detonation chamber 1, the upper cavity 9 and the lower cavity 10 form a closed space; during the process of filling the detonation chamber 1, the upper cavity 9 and the lower cavity 10 with fuel and oxidant, the lower panel 12 is affected by the filling pressure, and the lower cavity 10 moves vertically downward. Under the action of the spring 11, the maximum displacement of the lower cavity 10 does not exceed the height of the upper cavity 9; the displacement of the lower cavity 10 during the detonation and exhaust process does not exceed the height of the limit protection block 8.

[0045] The working process of the device of the present invention is:

[0046] After the device is placed at the designated work site, start the vacuum pump. When the set pressure is reached in the detonation chamber 1, turn off the vacuum pump. Open the stop valves on the fuel intake pipe 2 and the oxidant intake pipe 3, and fill the detonation chamber 1, the upper cavity 9 and the lower cavity 10 with fuel and oxidant. During the filling process of fuel and oxidant, the lower panel 12 is affected by the filling pressure, and the lower cavity 10 moves vertically downward. Under the action of the spring 11, the maximum displacement of the lower cavity 10 does not exceed the height of the upper cavity 9. At this time, the detonation chamber 1, the upper cavity 9 and the lower cavity 10 are still closed spaces. When the fuel and oxidant filling in the detonation chamber 1 reaches the set pressure, close the stop valves on the fuel intake pipe 2 and the oxidant intake pipe 3. The high-energy igniter works, and the high-energy ignition head 6 ignites the explosive mixture. The combustion wave in the detonation chamber 1 quickly forms a detonation wave. The lower panel 12 of the reciprocating exhaust device 2 moves downward under the action of high pressure. When the upper end of the lower cavity 10 moves over the lower end of the upper cavity 9, the high-temperature and high-pressure gas is discharged, and coupled with the surrounding medium to form a seismic wave. As the gas continues to be discharged, the pressure in the lower cavity 10 continues to drop. When the pressure on the lower panel 12 is less than the tension of the spring 11, the lower cavity 10 moves upward under the guidance of the limit protection block 8. When the upper end of the lower cavity 10 moves to the lower end of the upper cavity 9, the detonation chamber 1, the upper cavity 9 and the lower cavity 10 re-form a closed space, and the exhaust process ends. At this time, the tension of the spring 11 is balanced with the pressure on the lower panel 12, and the movement of the lower cavity 10 ends. The vacuum pump is started to extract the residual gas in the enclosed space through the exhaust pipe 2, the pressure in the lower cavity 10 decreases, and the lower cavity 10 continues to move upward until the upper end of the lower cavity 10 contacts the groove on the lower surface of the upper panel 7. When the detonation chamber 1 reaches the set pressure, the vacuum pump stops working, and the fuel and oxidant are refilled to fire the next seismic wave.

Claims

1. A continuously working gas detonation source device, characterized in that: It includes a detonation chamber and a reciprocating exhaust device located at the lower end of the rear end of the detonation chamber; wherein, The detonation chamber is tubular as a whole and placed in a vertical direction. The tail of the detonation chamber is a circular opening. The top of the detonation chamber is closed. A first through hole, a second through hole and a third through hole arranged in a regular triangle shape and perpendicular to the top solid wall are opened on the top solid wall. The reciprocating exhaust device comprises an upper panel, an upper cavity, a lower cavity, a lower panel, a spring and a limit protection block, wherein the upper panel is a circular thin plate, a through hole is provided in the center of the upper panel, and the aperture of the through hole is consistent with the outer diameter of the detonation chamber, the upper cavity is a cylindrical cavity, the lower cavity is a cylindrical cavity, the lower panel is a circular thin plate, the spring is symmetrically arranged outside the cavity, and the limit protection block comprises a first fan-shaped rib and a second fan-shaped rib; the lower end of the tail of the detonation chamber is embedded in the central through hole of the upper panel, and the tail outlet of the detonation chamber is flush with the lower surface of the upper panel; the upper end of the spring is connected to the lower surface of the upper panel, and the lower end is connected to the upper surface of the lower panel; The first through hole on the top solid wall of the detonation chamber is an exhaust hole, an exhaust pipe is welded on the outside of the exhaust hole, an anti-flashback valve and a stop valve are installed on the exhaust pipe, and the exhaust pipe is connected to a vacuum pump through an exhaust bellows; the second through hole on the top solid wall of the detonation chamber is a fuel inlet hole, a fuel inlet pipe is welded on the outside of the fuel inlet hole, an anti-flashback valve and a stop valve are installed on the fuel inlet pipe, and the fuel cylinder is connected to the fuel cylinder through the fuel inlet bellows; the third through hole on the top solid wall of the detonation chamber is an oxidant inlet hole, an oxidant inlet pipe is welded on the outside of the oxidant inlet hole, an anti-flashback valve and a stop valve are installed on the oxidant inlet pipe, and the oxidant cylinder is connected to the oxidant inlet bellows; The threaded hole on the upper part of the side wall of the detonation chamber is used to install a high-energy ignition head. The high-energy ignition head needs to be thread-sealed after being threaded. The high-energy ignition head is connected to a high-energy igniter on the well or on the shore through a waterproof ignition line. When the spring is in a natural reset state, the upper end of the lower cavity is embedded in the groove of the upper panel, and the detonation chamber, the upper cavity and the lower cavity form a closed space; during the process of filling the detonation chamber, the upper cavity and the lower cavity with fuel and oxidant, the lower panel is affected by the filling pressure, and the lower cavity moves vertically downward, and under the action of the spring, the maximum displacement of the lower cavity does not exceed the height of the upper cavity; the displacement of the lower cavity during detonation and exhaust does not exceed the height of the limit protection block.

2. A continuously operable gas detonation source device according to claim 1, characterized in that: The inner diameter of the upper cavity is larger than the outer diameter of the detonation chamber, is coaxial with the detonation chamber, and is welded and fixedly connected to the lower surface of the upper panel.

3. A continuously operable gas detonation source device according to claim 2, characterized in that: The thickness and curvature of the second fan-shaped rib of the limiting protection block are the same as those of the upper cavity, and the upper end surface of the second fan-shaped rib is welded and fixedly connected to the lower end surface of the upper cavity. The thickness and curvature of the first fan-shaped rib of the limiting protection block are the same as those of the lower cavity, and the upper end of the first fan-shaped rib is welded and fixedly connected to the lower surface of the upper panel, and the lower end is flush with the lower end of the second fan-shaped rib.

4. A continuously operable gas detonation source device according to claim 3, characterized in that: The inner diameter of the lower cavity is the same as the outer diameter of the upper cavity, and the wall thickness is the same as the wall thickness of the upper cavity; an annular groove is provided on the lower surface of the upper panel, and the inner and outer diameters of the annular groove are the same as the inner and outer diameters of the lower cavity.

5. A continuously operable gas detonation source device according to claim 4, characterized in that: The inner wall surface of the lower cavity fits the outer wall surface of the upper cavity and the outer wall surface of the second fan-shaped fin, and the outer wall surface of the lower cavity fits the inner wall surface of the first fan-shaped fin. The deepest part of the lower cavity can be embedded in the groove of the upper panel.

6. A continuously operable gas detonation source device according to claim 1, characterized in that: The lower panel has the same outer diameter and thickness as the upper panel and is fixedly connected to the lower end surface of the lower cavity by welding.

7. A continuously operable gas detonation source device according to claim 1, characterized in that: The number of the limit protection blocks is consistent with the number of springs and is arranged inside the springs. The limit protection blocks limit the movement of the lower cavity in the vertical direction, reduce the impact of explosion on the spring connection, and protect the spring.

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