A device and method for reducing explosive initiation noise

Abstract

The application relates to a device and a method for reducing explosive excitation noise, which comprises an explosive column, the inside of the explosive column is provided with an initiating device, the initiating device can initiate the explosive column, the outside of the explosive column is sleeved with a pressure-resistant sleeve, the initiating device is fixedly connected with a lead wire, and the lead wire extends from the side wall of the pressure-resistant sleeve. The application has the effects of reducing the lateral vibration intensity of an explosive seismic source and weakening the vibration noise generated by the near-surface.

Description

Technical Field

[0001] This application relates to the field of oil and gas geophysical exploration, and in particular to a device and method for reducing explosive-induced noise. Background Technology

[0002] Onshore oil and gas seismic exploration is often located in complex surface areas such as mountains, deserts, and loess plateaus. Explosive sources are the most commonly used excitation sources for onshore seismic exploration. After the explosives explode, they generate huge energy and form a violent shock wave that instantly acts on the surrounding rock and soil. The rock and soil near the explosion zone are shattered, resulting in a violent destructive effect. The remaining small part of the energy propagates to the surroundings in the form of medium deformation, forming seismic waves.

[0003] In oil and gas exploration, ground geophones receive seismic waves propagating upwards or laterally from the blast point. This seismic information is considered noise in oil and gas exploration. Only downward-propagating seismic waves can generate reflected seismic information at the interface of the subsurface medium and return to the ground geophones for reception. These are considered effective seismic waves (reflected waves, refracted waves, diffracted waves, sectional waves, etc.).

[0004] In order to find the best excitation effect, many scholars have conducted a lot of experiments on factors such as explosive detonation velocity, excitation charge, explosive column diameter, excitation medium of surrounding rock, excitation well depth, impedance coupling between explosive and surrounding rock, combined excitation, and well sealing method. The optimal excitation parameters are determined by the seismic signal characteristics obtained from the experimental data.

[0005] Regarding the aforementioned technologies, the inventors believe that in the prior art, the lateral vibration intensity induced by the explosive source is large, and the noise generated by the vibration near the ground surface is relatively large. Summary of the Invention

[0006] In order to reduce the intensity of lateral vibrations generated by explosive sources and reduce noise generated by vibrations near the ground surface, this application provides a device for reducing the noise generated by explosives.

[0007] This application provides a device for reducing the noise generated by explosives, which adopts the following technical solution:

[0008] A device for reducing the noise of explosive excitation includes an explosive column, an initiator disposed inside the explosive column, the initiator being capable of detonating the explosive column, a pressure-resistant sleeve sleeved on the outside of the explosive column, and a lead wire fixedly connected to the initiator, the lead wire extending from the side wall of the pressure-resistant sleeve.

[0009] Optionally, this application also discloses a method for reducing explosive excitation noise, including:

[0010] S1: Numerical simulation to select a suitable external pressure-resistant sleeve for the explosive;

[0011] S2: Field provocation test.

[0012] Optionally, the numerical simulation selects a suitable external pressure-resistant sleeve for the explosive, including:

[0013] S11: Based on the type of explosive used in oil and gas exploration, obtain the parameters of the size, density, and detonation velocity of the explosive source explosive column. Based on the relationship between the explosion pressure and the explosive density, detonation velocity, explosive charge, and explosive column length, obtain the explosion pressure.

[0014] S12: Collect different types of pressure-resistant sleeves, obtain the tensile strength, outer diameter, and wall thickness of the pressure-resistant sleeves, and calculate the maximum pressure intensity that different types of pressure-resistant sleeves can withstand and the initial impact pressure of the pressure-resistant sleeve wall.

[0015] S13: Select a pressure-resistant sleeve based on the peak pressure of the explosive charge, the outer diameter of the explosive charge, and the total length of all explosive charges.

[0016] Optionally, the field provocation test includes:

[0017] S21: Select the location for the explosive ignition test in oil and gas exploration, drill the ignition well according to the test requirements, and install equally spaced geophones to receive and monitor the intensity of the vibration amplitude of the seismic waves generated by the explosive ignition.

[0018] S22: The explosive charge is loaded into the selected pressure-resistant sleeve and fixed, placed in the detonation well, and the well is sealed with rock and soil. The detonator detonates the explosive charge, and a set of equally spaced detectors are used to record the ground vibration amplitude.

[0019] S23: Connect the explosive charge used nearby and place it in another detonation well, seal the well with rock and soil, detonate the explosive charge with the detonator, and record the ground vibration amplitude with a set of equally spaced detectors.

[0020] S24: Analyze the amplitude spectrum of the first arrival wave recorded twice by the geophone at the same distance within a time interval of 200ms to obtain the amplitude intensity of different frequencies, determine the vibration reduction effect of the explosive column in the open well and the explosive column with external pressure-resistant casing, and adjust the appropriate amount of excitation charge and pressure-resistant casing parameters.

[0021] Optionally, in S13, the pressure-resistant sleeve can withstand pressure greater than the initial impact pressure of the pressure-resistant sleeve wall.

[0022] Optionally, the inner diameter of the pressure-resistant sleeve is larger than the outer diameter of the explosive charge.

[0023] Optionally, the formula for calculating the explosion pressure is:

[0024]

[0025] In the formula: P e ρ is the explosion pressure, v is the explosive detonation velocity, t is the explosion duration, ρ is the explosive density, L is the total length of the explosive column, and d is the outer diameter of the explosive column.

[0026] Optionally, the formula for calculating the maximum pressure strength that the pressure-resistant sleeve can withstand is:

[0027]

[0028] In the formula: P a σ represents the maximum pressure strength; H represents the tensile strength; H represents the wall thickness of the pressure-resistant sleeve; and D represents the outer diameter of the pressure-resistant sleeve.

[0029] Optionally, the calculation formula for the initial pressure impact on the wall of the pressure-resistant casing is:

[0030]

[0031] In the formula: P r denoted as initial impact pressure; D is the outer diameter of the pressure-resistant sleeve; H is the wall thickness of the pressure-resistant sleeve; d is the outer diameter of the propellant charge.

[0032] In summary, this application includes at least one of the following beneficial technical effects:

[0033] 1. By establishing the properties of the explosive, the explosive source charge is placed in a pressure-resistant sleeve to rapidly attenuate the lateral pressure of the explosive explosion, reduce the vibration intensity on the medium near the surrounding rock, and lower the excitation noise near the ground surface.

[0034] 2. Activating the explosive in the casing can also enhance the downward energy transmission intensity of the explosive explosion, thus covering the effect of the explosive activation. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of a device for reducing the noise generated by explosives in an embodiment of this application.

[0036] Figure 2 This is a flowchart illustrating a method for reducing explosive-induced noise in an embodiment of this application.

[0037] Figure 3 This is a flowchart illustrating the numerical simulation of a method for reducing explosive excitation noise in an embodiment of this application, which involves selecting a suitable external sleeve for the explosive.

[0038] Figure 4 This is a schematic diagram of the field excitation test of a method for reducing explosive excitation noise in an embodiment of this application.

[0039] Explanation of reference numerals in the attached diagram: 1. Pressure-resistant sleeve; 2. Explosive charge; 3. Detonator; 4. Lead wire; 5. Filler. Detailed Implementation

[0040] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0041] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0042] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0043] This application discloses a device for reducing the noise generated by explosives. (Refer to...) Figure 1 A device for reducing the noise generated by explosives includes a pressure-resistant sleeve 1, which is a hollow cylindrical structure. An explosive charge 2 is installed inside the pressure-resistant sleeve 1, and a detonator 3 is embedded within the explosive charge 2. The detonator 3 is used to detonate the explosive charge 2. A lead wire 4 is fixedly connected to the upper end of the detonator 3, and the detonation of the detonator 3 is controlled by the lead wire 4.

[0044] The pressure-resistant casing 1 is placed in the well, which is filled with filler material 5, and the lead wire 4 extends out of the well.

[0045] Reference Figure 2 This application also provides a method for reducing explosive excitation noise, comprising the following steps:

[0046] S1: Numerical simulation selects a suitable external pressure-resistant sleeve 1 for the explosive;

[0047] S2: Field provocation test.

[0048] Reference Figure 2 , Figure 3 The numerical simulation for selecting a suitable external pressure-resistant sleeve 1 for the explosive includes the following steps:

[0049] S11: Based on the type of explosive used in oil and gas exploration, obtain the size, density, detonation velocity, and other parameters of the explosive column 2 source explosive column 2. Calculate the explosion pressure based on the relationship between the explosion pressure and the explosive density, detonation velocity, explosive charge, and the length of the explosive column 2.

[0050] The formula for calculating the explosion pressure is:

[0051]

[0052] In the formula: P eρ is the explosion pressure, v is the detonation velocity of the explosive, t is the explosion time, ρ is the density of the explosive, L is the total length of the explosive, and d is the outer diameter of the explosive charge.

[0053] S12: Collect different types of pressure-resistant sleeves 1, such as steel pipes and rubber hoses, and obtain parameters such as the tensile strength σ, outer diameter D, and wall thickness H of the pressure-resistant sleeve 1. Calculate the maximum pressure intensity P that different types of pressure-resistant sleeves 1 can withstand. a And the initial impact pressure P of the wall of the pressure-resistant sleeve 1 r The calculation formula is as follows;

[0054]

[0055]

[0056] S13: Based on the peak pressure of explosive charge 2, the outer diameter of explosive charge 2, and the total length of all explosive charge 2, select a pressure-resistant sleeve 1. The pressure it can withstand must be greater than the initial impact pressure of the sleeve wall, and the inner diameter of the sleeve 1 must be greater than the outer diameter of the explosive charge 2. That is:

[0057] P a >P r

[0058] d <D-H

[0059] In one embodiment, the explosive parameters used in a certain work area are as follows: the explosive detonation velocity v is 4000 m / s, t is the explosion duration 0.006 s, ρ is the explosive density 0.0011 kg / m³, L is the total length of the explosive charge 2 1.2 m, d is the outer diameter of the explosive charge 0.06 m, and the explosion pressure is calculated as follows:

[0060]

[0061] From the collected materials for pressure-resistant sleeve 1, a steel pipe material is found with a tensile strength σ of 840 MPa, an outer diameter D of 0.135 m, and a wall thickness H of 0.015 m. Calculate the maximum strength P that pressure-resistant sleeve 1 can withstand. a And the initial impact pressure P of the wall of the pressure-resistant sleeve 1 r ,as follows

[0062]

[0063]

[0064] According to the calculation results of the selected steel pipe material, the maximum pressure that the steel pipe material can withstand is greater than the maximum pressure that the steel pipe wall can withstand, and the inner diameter of the casing is greater than the outer diameter of the explosive column 2.

[0065] P a(186MPa)>P r (178MPa)

[0066] d(0.06m) <D-H(0.12m)

[0067] Reference Figure 2 , Figure 4 The field provocation test includes the following steps:

[0068] S21: Select the location for the ignition test of explosive column 2 in oil and gas exploration, drill an ignition well to a certain depth according to the test requirements, and set up equally spaced geophones of a certain length to receive and monitor the vibration amplitude of the seismic waves generated by the ignition of explosive column 2.

[0069] S22: The explosive charge 2 is loaded into the selected pressure-resistant sleeve 1 and fixed, placed in the detonation well, and the well is sealed with rock and soil. The detonator 3 detonates the explosive charge 2, and the ground vibration amplitude is recorded by a set of equally spaced detectors.

[0070] S23: Connect the explosive charge 2 used nearby and place it in another detonation well, seal the well with rock and soil, detonate the explosive charge 2 with detonator 3, and record the ground vibration amplitude with a set of equally spaced detectors.

[0071] S24: Analyze the amplitude spectrum of the first arrival wave recorded twice by the geophone at the same distance within a time interval of 200ms below the first arrival wave, obtain the amplitude intensity of different frequencies, determine the effect of the explosion of the explosive column 2 in the open well and the effect of the outer pressure casing 1 of the explosive column 2 in reducing the vibration of the near-surface rock and soil, adjust the appropriate amount of excitation charge and the parameters of the pressure casing 1 to reduce the vibration of the near-surface rock and soil and improve the excitation effect.

[0072] In this invention, the term "multiple" refers to at least two or more, unless otherwise explicitly defined. The terms "install," "connect," "link," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "link" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0073] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

Claims

1. A method of reducing explosive initiation noise, characterized by, The method comprises: S1: numerical simulation selects a suitable explosive outer compression casing (1), the numerical simulation selecting a suitable explosive outer compression casing comprises: S11: according to the type of explosive column (2) used in oil and gas exploration, the size, density and detonation velocity of the explosive column (2) are obtained, and the explosion pressure is obtained according to the relationship between the explosion pressure and the density, detonation velocity, charge and length of the explosive column (2); S12: collecting different types of the compression casing (1), obtaining the tensile strength, outer diameter and wall thickness of the compression casing (1), calculating the maximum pressure strength that the compression casing (1) can withstand and the initial impact pressure of the compression casing (1) wall; S13: according to the peak pressure of the explosive column (2), the outer diameter size of the explosive column (2) and the total length of all the explosive columns (2), a compression casing (1) is selected; S2: field excitation test, the field excitation test comprises: S21: selecting the explosive excitation test position of oil and gas exploration, drilling the excitation well according to the test requirements, and arranging the equidistant geophone to receive and monitor the vibration amplitude of the seismic wave generated by the explosive excitation; S22: the explosive column (2) used is placed in the selected compression casing (1) and fixed, placed into the excitation well, and the well is filled with rock soil, the explosive column (2) is detonated by the detonator, and the ground vibration amplitude is recorded by the equidistant geophone; S23: the explosive column (2) used is directly connected and placed in another excitation well, and the well is filled with rock soil, the explosive column (2) is detonated by the detonator, and the ground vibration amplitude is recorded by the equidistant geophone; S24: analyzing the amplitude spectrum of the first arrival wave recorded by the geophone at the same distance for two times within 200ms period, obtaining the amplitude strength of different frequencies, judging the vibration effect of the explosive column (2) bare hole explosion and the explosive column (2) plus compression casing (1) on reducing near-surface rock soil, and adjusting the reasonable excitation charge and compression casing (1) parameters.

2. The method of claim 1, wherein: In S13, the compression casing (1) can withstand a pressure greater than the initial impact pressure of the compression casing (1) wall.

3. The method of claim 1, wherein: The inner diameter of the compression casing (1) is greater than the outer diameter of the explosive column (2).

4. The method of claim 1, wherein: The calculation formula of the explosion pressure is: where: is the explosive pressure, v is the detonation velocity, t is the time of action, p is the density of the explosive, L is the total length of the column of explosive, and d is the outer diameter of the column of explosive.

5. The method of claim 1, wherein: The calculation formula of the maximum pressure strength that the compression casing (1) can withstand is: wherein: is the maximum compressive strength; is the tensile strength; H is the compressive sleeve wall thickness; and D is the compressive sleeve outside diameter.

6. The method of claim 1, wherein: The calculation formula of the initial pressure impact of the compression casing (1) wall is: wherein: P0is the initial impact pressure; D is the outer diameter of the pressure- resistant sleeve; H is the wall thickness of the pressure-resistant sleeve; and d is the outer diameter of the propellant grain.

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