A high-pressure gas explosion-based shear wave seismic source excitation device and an application method thereof

Abstract

The present disclosure relates to a high-pressure gas explosion-based shear wave source excitation device and an application method thereof. The device comprises an acceleration tube, a first cover plate and a second cover plate arranged at both ends of the acceleration tube for sealing the acceleration tube, wherein a igniter access hole and a gas injection hole are arranged on the first cover plate; a detonation tube arranged in the inner cavity of the acceleration tube, wherein one end of the detonation tube is fixedly connected with the first cover plate; a third cover plate arranged at the other end of the detonation tube for sealing the detonation tube, wherein the area of the third cover plate is smaller than the cross-sectional area of the acceleration tube. The device has the advantages of strong shear wave signal, environmental protection, good economy and good field adaptability, and solves the problems of easy restriction of driving capacity and ground coupling efficiency of the shear wave source and poor field operation ability.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of seismic exploration, in particular to a shear wave source excitation device based on high-pressure gas explosion and an application method thereof. BACKGROUND

[0002] Shear wave exploration is an important geological exploration method. Shear waves have low wave speed and high resolution, and their propagation is only related to the skeleton of the rock. Therefore, shear wave exploration can not only obtain higher resolution data than longitudinal waves, but also solve the problem of non-imaging in gas cloud area in longitudinal wave exploration.

[0003] In related technologies, a gas explosion shear wave source excitation device is disclosed. The excitation device includes a gas storage cavity, a ignition element and a reflection block are arranged in the gas storage cavity, the reflection block is obliquely arranged at the bottom of the gas storage cavity, a gas release port is arranged on the outer wall of the cavity opposite to the inclined surface of the reflection block, the gas release port is provided with a sealed burst diaphragm, a gas injection pipe is connected to the gas storage cavity, and a stop valve is arranged on the gas injection pipe. The current output by the ignition wire is used to excite the ignition element to ignite and burst, the high-temperature and high-pressure gas is reflected by the reflection block, the burst diaphragm is instantaneously broken from the gas release port, the gas is released, thereby generating shear waves in the surrounding medium and propagating. This method can obtain strong shear wave energy, and can directly explore oil and gas and minerals by combining with longitudinal wave exploration and directly judging the material Poisson's ratio. In addition, the device has small volume, which not only reduces the cost, but also is convenient to carry and easy to carry and field exploration, can directly explore oil and gas and minerals by directly judging the material Poisson's ratio.

[0004] In related technologies, a shear wave source device based on a gas explosion source cavity and a seismic data acquisition method are also disclosed. A center shaft is arranged at the vertical center of a rectangular steel plate, two gas explosion source cavities are fixed on the two vertical edges of the rectangular steel plate, and the two gas explosion source cavities are located on the two sides of the rectangular steel plate. One side of the gas explosion source cavity is cut into a thin cavity surface, and the opposite surface of the thin cavity surface is fixed on the surface of the rectangular steel plate. An electronic ignition gun is installed at the center of the gas explosion source cavity, and the gas explosion source cavity is connected with an explosion-proof metal gas tank. Shear wave source signals parallel to the source line direction and downward propagation and shear wave source signals perpendicular to the source line direction and downward propagation are sequentially excited at each source point. A three-component geophone records two mutually orthogonal and parallel to the ground shear wave data, vertical to the ground seismic conversion longitudinal wave data, and truly realizes pure shear wave and conversion longitudinal wave seismic exploration parallel to the ground.

[0005] The gas explosion source in the related art releases energy through a gas detonation reaction, generates vibration in the land, and can obtain a better longitudinal wave signal, but the transverse wave signal generated is weak and cannot be used for geological exploration. The first gas explosion transverse wave source excitation device has low transverse wave generation efficiency due to weak gas product constraint. The second gas explosion transverse wave source excitation device relies on a transverse wave source generated by torsion. This device has a complex structure and low transverse wave conversion efficiency. Therefore, when the two kinds of gas explosion transverse wave source excitation devices are used, the transverse wave source is easily limited by driving capacity and ground coupling efficiency, the transverse wave energy generated is limited, the transverse wave signal is weak, the effective range and depth of exploration are limited, and in use, the source vehicle needs to be passable, which also limits the field operation ability to some extent. SUMMARY

[0006] In order to solve the above technical problems or at least partially solve the above technical problems, embodiments of the present disclosure provide a high-pressure gas explosion-based transverse wave source excitation device and an application method thereof.

[0007] In a first aspect, embodiments of the present disclosure provide a high-pressure gas explosion-based transverse wave source excitation device, which comprises:

[0008] an acceleration tube;

[0009] a first cover plate and a second cover plate arranged at both ends of the acceleration tube for sealing the acceleration tube, wherein a gas injection hole and an igniter access hole are arranged on the first cover plate;

[0010] a detonation tube arranged in the inner cavity of the acceleration tube, wherein one end of the detonation tube is fixedly connected with the first cover plate;

[0011] a third cover plate arranged at the other end of the detonation tube for sealing the detonation tube, wherein the area of the third cover plate is smaller than the cross-sectional area of the acceleration tube.

[0012] In a possible implementation, an igniter access hole pipe is arranged on the igniter access hole for connection with an external ignition device.

[0013] In a possible implementation, a double-head gas injection pipe is arranged on the gas injection hole for communication with a methane storage device and an oxygen storage device through a gas conduit, respectively.

[0014] In a possible implementation, the material of the detonation tube is iron or stainless steel, and the wall thickness of the detonation tube is determined according to the pressure of the gas to be injected and the generated detonation pressure.

[0015] In a possible implementation, the material of the acceleration tube is iron or stainless steel.

[0016] In a possible implementation, the first cover plate, the second cover plate and the third cover plate are made of steel.

[0017] In a possible implementation, the first cover plate has an area greater than a cross-sectional area of the acceleration tube.

[0018] In a possible implementation, the device further comprises a coupling plate connected in parallel with the second cover plate.

[0019] In a second aspect, embodiments of the present disclosure provide an application method of the high-pressure gas explosion-based shear wave source excitation device.

[0020] The external ignition device is connected to the igniter access hole pipe of the high-pressure gas explosion-based shear wave source excitation device through a sealing bolt, so that the external ignition device can perform ignition work, and the double-head gas injection pipe of the high-pressure gas explosion-based shear wave source excitation device is in communication with the methane storage device and the oxygen storage device.

[0021] The high-pressure gas explosion-based shear wave source excitation device is buried in the ground, and a soil layer with a predetermined thickness is covered above the high-pressure gas explosion-based shear wave source excitation device.

[0022] The valves of the methane storage device and the oxygen storage device are opened, and a predetermined amount of gas in the methane storage device and the oxygen storage device is injected into the high-pressure gas explosion-based shear wave source excitation device.

[0023] After the gas injection is completed, ignition work is performed, and after the gas in the high-pressure gas explosion-based shear wave source excitation device is ignited, an explosion reaction occurs, the shock wave generated by the explosion reaction pushes open the first cover plate, the high-temperature gas after the explosion reaction is released from the direction of the first cover plate, and the third cover plate and the detonation tube are accelerated to move towards the second cover plate, and high-speed impact is generated on the second cover plate and the coupling plate in the acceleration tube, directional energy release is formed, and a high-intensity shear wave is generated in the ground.

[0024] In a second aspect, embodiments of the present disclosure provide an application method of the high-pressure gas explosion-based shear wave source excitation device.

[0025] The external ignition device is connected to the igniter access hole pipe of the high-pressure gas explosion-based shear wave source excitation device through a sealing bolt, so that the external ignition device can perform ignition work, and the double-head gas injection pipe of the high-pressure gas explosion-based shear wave source excitation device is in communication with the methane storage device and the oxygen storage device.

[0026] The high-pressure gas explosion-based shear wave source excitation device is buried in the ground, and a soil layer with a predetermined thickness is covered above the high-pressure gas explosion-based shear wave source excitation device.

[0027] opening valves of the methane storage device and the oxygen storage device, injecting a predetermined amount of gas in the methane storage device and the oxygen storage device into the high-pressure gas explosion transverse wave source excitation device;

[0028] after the gas injection is completed, ignition is performed, after the gas in the high-pressure gas explosion transverse wave source excitation device is ignited, an explosion reaction occurs, an impact wave generated by the explosion reaction pushes away the first cover plate, high-temperature gas after the explosion reaction is released from the direction of the first cover plate, and the third cover plate and the detonation tube are accelerated to move towards the second cover plate, and high-speed impact on the second cover plate and the coupling plate in the acceleration tube is formed, directional energy release is formed, and a high-intensity transverse wave is generated in the ground.

[0029] The above technical solutions provided by the embodiments of the present disclosure have at least some or all of the following advantages compared with the prior art:

[0030] The high-pressure gas explosion transverse wave source excitation device based on the high-pressure gas explosion provided by the embodiments of the present disclosure includes an acceleration tube, a first cover plate and a second cover plate arranged at both ends of the acceleration tube for sealing the acceleration tube, wherein the first cover plate is provided with an igniter access hole and a gas injection hole; a detonation tube arranged in the inner cavity of the acceleration tube, wherein one end of the detonation tube is fixedly connected with the first cover plate; and a third cover plate arranged at the other end of the detonation tube for sealing the detonation tube, wherein the area of the third cover plate is smaller than the cross-sectional area of the acceleration tube, the transverse wave signal is strong, the device is environmentally friendly, and the device has good economy and good field adaptability, and the problems of the transverse wave source being easily limited by driving capacity and ground coupling efficiency and poor field operation capacity are solved. BRIEF DESCRIPTION OF DRAWINGS

[0031] The accompanying drawings, which are incorporated into the specification and constitute part of the specification, illustrate embodiments consistent with the present disclosure and, together with the specification, serve to explain the principles of the present disclosure.

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the accompanying drawings needed to be used in the embodiments or related technical descriptions will be briefly introduced as follows, and obviously, other accompanying drawings can also be obtained by those skilled in the art without creative labor.

[0033] Figure 1 The structure of the transverse wave source body in the high-pressure gas explosion transverse wave source device based on the high-pressure gas explosion according to the embodiments of the present disclosure is schematically shown;

[0034] Figure 2 The structure of the high-pressure gas explosion transverse wave source device based on the high-pressure gas explosion according to the embodiments of the present disclosure is schematically shown;

[0035] Figure 3 An application structure schematic diagram of the high-pressure gas explosion based transverse wave seismic source device according to the embodiment of the present disclosure is shown schematically;

[0036] Figure 4 An application method flowchart of the high-pressure gas explosion based transverse wave seismic source device according to the embodiment of the present disclosure is shown schematically,

[0037] In the drawings, 1-ground; 2-coupling plate; 3-transverse wave seismic source body; 4-accelerating tube; 5-third cover plate; 6-explosive tube; 7-first cover plate; 8-double head gas injection tube; 9-igniter access hole tube. DETAILED DESCRIPTION

[0038] To make the objectives, technical solutions and advantages of the embodiments of the present disclosure clearer, the technical solutions in the embodiments of the present disclosure will be described clearly and completely below with reference to the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are some but not all of the embodiments of the present disclosure. Based on the embodiments in the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the scope of protection of the present disclosure.

[0039] Referring to Figure 1 , the embodiment of the present disclosure provides a high-pressure gas explosion based transverse wave seismic source device, which comprises:

[0040] an accelerating tube 4, a first cover plate 7 and a second cover plate arranged at both ends of the accelerating tube for sealing the accelerating tube, wherein the first cover plate is provided with an igniter access hole and a gas injection hole, and the accelerating tube can be fixedly installed between the first cover plate and the second cover plate by bolts;

[0041] an explosive tube 6 arranged in the inner cavity of the accelerating tube, wherein one end of the explosive tube is fixedly connected with the first cover plate;

[0042] a third cover plate 5 arranged at the other end of the explosive tube for sealing the explosive tube, wherein the area of the third cover plate is smaller than the cross-sectional area of the accelerating tube, so that the third cover plate is movably connected with the inner cavity of the accelerating tube in the inner cavity of the accelerating tube, and the explosive tube can be fixedly installed between the third cover plate and the first cover plate by bolts.

[0043] The high-pressure gas explosion based transverse wave seismic source device of the present disclosure can increase the kinetic energy generated by the explosive tube by arranging the accelerating tube, so as to increase the impact force generated by the device.

[0044] The high-pressure gas explosion based transverse wave seismic source device of the present disclosure can seal the accelerating tube by arranging the first cover plate, and at the same time, it is also convenient to install the double head gas injection tube and the igniter access hole tube.

[0045] The high-pressure gas explosion based transverse wave seismic source device of the present disclosure can drive the detonation tube to move so as to transfer kinetic energy to the coupling plate by setting the third cover plate.

[0046] Referring to Figure 1 The igniter access hole is provided with an igniter access hole pipe 9 for connecting with an external ignition device, which can be an electric spark generator.

[0047] Referring to Figure 1 The gas injection hole is provided with a double-head gas injection pipe 8 for communicating with a methane storage device and an oxygen storage device through a gas conduit, both of which can be gas tanks with gas pressure gauges.

[0048] The high-pressure gas explosion based transverse wave seismic source device of the present disclosure is convenient for communicating with the gas storage devices of methane and oxygen by setting the double-head gas injection pipe, so as to inject the two kinds of gas into the device, thereby ensuring the normal operation of the device.

[0049] In the embodiment, the material of the detonation tube is iron or stainless steel, and the wall thickness of the detonation tube is determined according to the pressure of the gas to be injected and the generated detonation pressure, so as to ensure the integrity of the acceleration tube cavity during the gas detonation process.

[0050] In the embodiment, the material of the acceleration tube can be iron or stainless steel.

[0051] In the embodiment, the materials of the first cover plate, the second cover plate and the third cover plate can be steel.

[0052] In the embodiment, the area of the first cover plate is greater than the cross-sectional area of the acceleration tube, and preferably, the area of the first cover plate is slightly greater than the cross-sectional area of the acceleration tube.

[0053] Referring to Figure 2 The device further comprises a coupling plate connected in parallel with the second cover plate, and it is to be noted that the coupling plate and the second cover plate can be fixedly connected together, or can be independent of each other and only placed together when collecting seismic data. The coupling plate can be a steel plate, and when the high-pressure gas explosion based transverse wave seismic source excitation device is applied to the oil and gas exploration seismic data collection link, the coupling plate is in close connection with the ground and the second cover plate.

[0054] In the application of the high-pressure gas explosion based shear wave source excitation device in the seismic data acquisition link of oil and gas exploration, whether to use the coupling plate in the shear wave source excitation device is determined according to the working environment of the high-pressure gas explosion based shear wave source excitation device, wherein, in the case of the rock environment, the coupling plate in the shear wave source excitation device does not need to be used; in the case of the soil environment, the coupling plate in the shear wave source excitation device needs to be used.

[0055] In the case of the soil environment, the shear wave source excitation device comprises a coupling plate, as shown in Figure 2 and Figure 3 In the case of the soil environment, the application method of the shear wave source excitation device comprises the following steps:

[0056] The two ends of the coupling plate are filled with soil, and then the external ignition device is connected into the ignition access hole pipe through the closure bolt, so that the external ignition device can normally ignite, and the user can then communicate with the methane and oxygen storage gas tanks through the double-head gas injection pipe;

[0057] After preparation is completed, the shear wave source body 3 in the shear wave source excitation device except the coupling plate is buried in the earth 1, and the left side of the shear wave source body can be in close contact with the right side of the coupling plate, so that the arrangement angle between the coupling plate and the shear wave source body is similar to the working angle of the shear wave source vehicle, and then a certain thickness of soil layer is covered above the shear wave source body, to ensure that the coupling plate penetrates the top of the earth, preferably, when the shear wave source body is buried in the earth, the position of the ignition access hole pipe on the shear wave source body is above the double-head gas injection pipe;

[0058] After installation is completed, the valve on the methane and oxygen storage gas tank is opened, and then a certain amount of gas in the two storage gas tanks is injected into the shear wave source body according to the gas pressure displayed by the gas pressure gauge, so that the two gases can be mixed in the shear wave source body to form high-pressure combustible gas;

[0059] After the gas injection is completed, the ignition device is ignited remotely at a safe distance, and after the gas in the shear wave source body is ignited, the gas will explode, the shock wave generated by the explosion will push the first cover plate away, the high-temperature gas after the reaction is released from the right end, and the third cover plate and the detonation tube are pushed to move leftward at a high speed in the acceleration tube, and finally impact the coupling plate to form directional energy release and generate high-intensity shear waves in the earth, so as to explore the geology.

[0060] Referring to Figure 4 In the case of the rock environment, the application method of the shear wave source excitation device comprises the following steps:

[0061] S1, by closing the bolt, the external ignition device is connected to the ignition hole pipe of the high-pressure gas explosion transverse wave source excitation device, so that the external ignition device can work, and then the double-head gas injection pipe of the high-pressure gas explosion transverse wave source excitation device is communicated with the methane storage device and the oxygen storage device;

[0062] S2, the high-pressure gas explosion transverse wave source excitation device is buried in the ground, and a soil layer with a predetermined thickness is covered above the high-pressure gas explosion transverse wave source excitation device;

[0063] S3, open the valve of the methane storage device and the oxygen storage device, and inject a predetermined amount of gas in the methane storage device and the oxygen storage device into the high-pressure gas explosion transverse wave source excitation device;

[0064] S4, after the gas injection is completed, ignition operation is performed, after the gas in the high-pressure gas explosion transverse wave source excitation device is ignited, an explosion reaction occurs, the shock wave generated by the explosion reaction pushes the first cover plate, the high-temperature gas after the explosion reaction is released from the direction of the first cover plate, and the third cover plate and the detonation tube are accelerated to the second cover plate, and the second cover plate and the coupling plate are impacted at high speed in the acceleration tube, forming directional energy release, and generating high-intensity transverse waves in the ground.

[0065] The high-pressure gas explosion transverse wave source device of the present disclosure cooperates with the ground, the coupling plate, the acceleration tube, the first cover plate, the detonation tube, the second cover plate, the double-head gas injection pipe and the ignition hole pipe, so that the transverse wave source excitation signal generated by the transverse wave source device is strong during operation, and the device has certain environmental protection and good economy during use, and also has good adaptability in the field, thereby solving the problems of insufficient transverse wave source signal intensity, insufficient detection depth and poor field operation ability caused by the limitation of driving ability and ground coupling efficiency of the transverse wave source.

[0066] It should be noted that in this paper, relationship terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. Without more limitation, the element defined by the statement "including a" does not exclude the presence of another identical element in the process, method, article or equipment including the element.

[0067] The foregoing detailed description has set forth various embodiments of the present disclosure via the use of specific terminology. However, embodiments thereof can be practiced without the specific details (e.g., quantities, values, etc.) set forth in the specification and drawings. The present disclosure can be practiced with or without the specific details set forth.

Claims

1. A transverse wave source excitation device based on high-pressure gas explosion, characterized in that, The device includes: Accelerator tube; A first cover plate and a second cover plate are provided at both ends of the acceleration tube to seal the acceleration tube. The first cover plate is provided with an igniter inlet hole and a gas injection hole. An igniter inlet pipe is provided on the igniter inlet hole for connecting to an external ignition device. A double-ended gas injection pipe is provided on the gas injection hole for connecting to a methane storage device and an oxygen storage device respectively through a gas conduit. A detonation tube is disposed in the inner cavity of the acceleration tube, wherein one end of the detonation tube is fixedly connected to the first cover plate; A third cover plate is disposed at the other end of the detonation tube to seal the detonation tube, wherein the area of ​​the third cover plate is smaller than the cross-sectional area of ​​the acceleration tube; A coupling plate is connected in parallel to the second cover plate; The use of the coupling plate is determined based on the working environment of the shear wave source excitation device based on high-pressure gas explosion. In the case of a rock environment, the coupling plate in the shear wave source excitation device is not required; in the case of a soil environment, the coupling plate in the shear wave source excitation device is required.

2. The transverse wave source excitation device based on high-pressure gas explosion according to claim 1, characterized in that, The detonation tube is made of iron or stainless steel, and its wall thickness is determined based on the pressure of the gas to be injected and the detonation pressure generated.

3. The transverse wave source excitation device based on high-pressure gas explosion according to claim 1, characterized in that, The accelerating tube is made of iron or stainless steel.

4. The transverse wave source excitation device based on high-pressure gas explosion according to claim 1, characterized in that, The first cover plate, the second cover plate, and the third cover plate are made of steel.

5. The transverse wave source excitation device based on high-pressure gas explosion according to claim 1, characterized in that, The area of ​​the first cover plate is larger than the cross-sectional area of ​​the accelerator tube.

6. An application method of a shear wave source excitation device based on high-pressure gas explosion according to any one of claims 1 to 5, characterized in that, Applied to rocky environments, the method includes: The external ignition device is connected to the ignition inlet tube of the high-pressure gas explosion shear wave source excitation device by sealing bolts, so that the external ignition device can perform ignition work. Then, the dual-head gas injection pipe of the high-pressure gas explosion shear wave source excitation device is connected to the methane storage device and the oxygen storage device. The shear wave source excitation device of the high-pressure gas explosion is buried in the ground, and a soil layer of a predetermined thickness is covered above the shear wave source excitation device of the high-pressure gas explosion. Open the valves of the methane storage device and the oxygen storage device, and inject a predetermined amount of gas from the methane storage device and the oxygen storage device into the transverse wave source excitation device for the high-pressure gas explosion; After the gas injection is completed, the ignition operation is carried out. After the gas in the high-pressure gas explosion transverse wave source excitation device is ignited, an explosion reaction occurs. The shock wave generated by the explosion reaction blows open the first cover plate. The high-temperature gas after the explosion reaction is released from the direction of the first cover plate. At the same time, it pushes the third cover plate and the detonation tube to accelerate towards the second cover plate. The gas impacts the second cover plate at high speed in the acceleration tube, forming a directional energy release and generating a high-intensity transverse wave in the ground.

7. An application method of a shear wave source excitation device based on high-pressure gas explosion according to any one of claims 1 to 5, characterized in that, Applied to soil environments, the method includes: The external ignition device is connected to the ignition inlet tube of the high-pressure gas explosion shear wave source excitation device by sealing bolts, so that the external ignition device can perform ignition work. Then, the dual-head gas injection pipe of the high-pressure gas explosion shear wave source excitation device is connected to the methane storage device and the oxygen storage device. The shear wave source excitation device of the high-pressure gas explosion is buried in the ground, and a soil layer of a predetermined thickness is covered above the shear wave source excitation device of the high-pressure gas explosion. Open the valves of the methane storage device and the oxygen storage device, and inject a predetermined amount of gas from the methane storage device and the oxygen storage device into the transverse wave source excitation device for the high-pressure gas explosion; After the gas injection is completed, the ignition operation is carried out. After the gas in the high-pressure gas explosion transverse wave source excitation device is ignited, an explosion reaction occurs. The shock wave generated by the explosion reaction blows open the first cover plate. The high-temperature gas after the explosion reaction is released from the direction of the first cover plate. At the same time, it pushes the third cover plate and the detonation tube to accelerate towards the second cover plate. In the acceleration tube, it impacts the second cover plate and the coupling plate at high speed, forming a directional energy release and generating a high-intensity transverse wave in the ground.

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