Electronic detonator waterproof device for seismic exploration well

Abstract

The utility model discloses an electronic detonator waterproof device for seismic exploration gun well relates to seismic exploration technical field, specifically is an electronic detonator waterproof device for seismic exploration gun well, including inner layer sealed pipe, outer layer pressure compensation pipe, a plurality of composite O shape ring, this electronic detonator waterproof device through the synergies of composite O shape ring and inner and outer layer sealed pipe, realized pressure self -compensation, perfect solution the problem of existing technology under the high pressure environment of deep well seal failure. Composite O shape ring is composed of metal sheet and rubber coating, metal sheet adopts spring steel material, has good elasticity and deformation ability, and the whole design is C type opening structure. When the electronic detonator is lowered into the gun well, composite O shape ring is extruded by external pressure at this time, and the metal sheet in its inside will shrink deformation, and this deformation will drive the rubber coating outside to shrink synchronously, and then the greater extrusion force is generated to the outer layer pressure compensation pipe sleeved in the inside.

Description

Technical Field

[0001] This utility model relates to the field of seismic exploration technology, specifically to a waterproof device for electronic detonators used in seismic exploration wells. Background Technology

[0002] In the field of seismic exploration, electronic detonators, as key initiating elements, face significant challenges to their waterproofing performance due to the complexity and harshness of their operating environment. Currently, some patents exist related to waterproofing of electronic detonators, such as the utility model patent CN217927112U, "A Double Waterproof Sealing Ring for Waterproof Wire Clamps of Electronic Detonators." This patent achieves waterproof isolation of the wiring area within the clamp box by setting a partition inside the sealing ring, dividing it into multiple independent sealing areas, thus improving the waterproof safety of electronic detonator wiring connections to some extent. However, this patent technology mainly focuses on sealing rings for electronic detonator clamps, and its application is limited to sealing within the clamp box. It does not provide an effective solution for the overall waterproofing of electronic detonators within the borehole in seismic exploration, especially for critical components such as the connection between the detonator body and the lead wire, and the twisted connection between the lead wire and the borehole wire, under the high pressure environment of deep wells.

[0003] In actual seismic exploration well operations, the waterproofing challenges faced by electronic detonators are mainly reflected in the following aspects: First, electronic detonators need to be lowered into deep wells. For every 10 meters increase in well depth, the hydrostatic pressure increases by approximately 0.1 MPa. When the well depth reaches 100 meters, the hydrostatic pressure can exceed 1 MPa. Existing conventional waterproofing structures for electronic detonators, such as simple sealing rings or insulating tape wrapping, are prone to seal failure under such high hydrostatic pressure. This allows water to seep into the detonator's interior or the wiring connections, causing short circuits and misfires. This not only affects the normal progress of exploration operations but may also pose safety hazards. Second, for the joint between the detonator lead wire and the firing wire, current technology typically only uses insulating tape or ordinary sealing rings. These methods are insufficient to effectively fill the gaps at the joint, and under high-pressure water conditions, the sealing structure is easily deformed by pressure, leading to a decrease in waterproofing performance. Moisture can easily seep in through the gaps at the joint, damaging the electrical connections and affecting the detonation reliability of the electronic detonator.

[0004] In summary, existing patented technologies have significant shortcomings in the application of waterproofing in electronic detonator wells. They cannot meet the comprehensive and highly reliable waterproofing requirements of electronic detonators in high-pressure and complex environments within seismic exploration wells. There is an urgent need for a waterproofing device for electronic detonators that can effectively seal key components such as the detonator body, lead wire, and the joint between the lead wire and the firing wire, in order to solve the problems of sealing failure and low waterproofing reliability in existing technologies. Utility Model Content

[0005] (a) Technical problems to be solved To address the shortcomings of existing technologies, this utility model provides a waterproof device for electronic detonators used in seismic exploration wells, solving the problems mentioned in the background section.

[0006] (II) Technical Solution To achieve the above objectives, this utility model provides the following technical solution: a waterproofing device for electronic detonators used in seismic exploration boreholes, comprising an inner sealing tube, an outer pressure compensation tube, and multiple composite O-rings. The inner sealing tube is fitted onto the outer wall of the area to be waterproofed by the electronic detonator, and covers the area. The outer pressure compensation tube is fitted onto the outer wall of the inner sealing tube, and covers the inner sealing tube. The composite O-rings are fitted onto the outer wall of the outer pressure compensation tube. The composite O-rings are compressed and tightened within the borehole by pressure, pressing against the outer pressure compensation tube and the inner sealing tube.

[0007] Optionally, the composite O-ring is composed of a metal sheet and a rubber coating layer, with the rubber coating layer wrapped around the outer wall of the metal sheet; the metal sheet deforms under pressure inside the borehole, and the metal sheet as a whole contracts to compress the outer pressure compensation pipe and the inner sealing pipe.

[0008] Optionally, the inner wall of the inner sealing tube is pre-coated with high-viscosity silicone grease, and the inner sealing tube is bonded to the outer wall of the area to be waterproofed in the electronic detonator by the high-viscosity silicone grease.

[0009] Optionally, it also includes multiple elastic O-rings, each of which is tightly clamped to the outer wall of the outer pressure compensation tube, and the elastic O-rings are made of oil-resistant nitrile rubber material.

[0010] Optionally, both the inner sealing tube and the outer pressure compensation tube are made of oil-resistant nitrile rubber.

[0011] Optionally, the composite O-ring is C-shaped in general, and each composite O-ring is clamped onto the outer wall of the outer pressure compensation tube from multiple directions.

[0012] Optionally, the inner sealing tube is filled with numerous water-swellable rubber particles.

[0013] Optionally, the space between the inner sealing tube and the outer pressure compensation tube is filled with numerous water-swellable rubber particles.

[0014] (III) Beneficial Effects This utility model provides a waterproof device for electronic detonators used in seismic exploration wells, which has the following beneficial effects: 1. This electronic detonator waterproofing device achieves pressure self-compensation through the synergistic effect of the composite O-ring and the inner and outer sealing tubes, perfectly solving the problem of easy seal failure in deep well high-pressure environments in existing technologies. The composite O-ring consists of a metal sheet and a rubber coating. The metal sheet is made of spring steel, which has good elasticity and deformation capacity, and the overall design is a C-shaped opening structure. When the electronic detonator is lowered into the borehole, the hydrostatic pressure gradually increases with the depth of the well. At this time, the composite O-ring is squeezed by the external pressure, and the metal sheet inside will shrink and deform. This deformation will cause the outer rubber coating to shrink synchronously, thus generating greater extrusion force on the outer pressure compensation tube installed inside. The outer pressure compensation tube transmits the extrusion force to the inner sealing tube, making the inner sealing tube fit more tightly with the outer wall of the area to be waterproofed by the electronic detonator, forming a pressure self-compensation effect of "the greater the water pressure, the tighter the seal". Compared with ordinary sealing rings or insulating tapes that lack pressure compensation mechanisms in existing technologies, this device can maintain reliable sealing performance in boreholes of different depths. Even in high-pressure environments of 1 MPa or higher in 100-meter deep wells, it can effectively prevent water intrusion, avoid sealing failure caused by high pressure, significantly improve the waterproof reliability of electronic detonators in high-pressure environments, and reduce the risk of misfire caused by water ingress.

[0015] 2. This device employs a multi-layered waterproof structure consisting of an inner sealing tube, an outer pressure compensation tube, composite O-rings, elastic O-rings, and water-swellable rubber granules. It comprehensively covers the area of ​​the electronic detonator to be waterproofed, effectively solving the problem of poor waterproofing in existing technologies at key locations such as the connection between the detonator body and the lead wire, and the splice between the lead wire and the firing line. The inner sealing tube is made of oil-resistant nitrile rubber, with its inner wall pre-coated with high-viscosity silicone grease. This high-viscosity silicone grease has excellent sealing and adhesion properties, filling the tiny gaps between the inner sealing tube and the outer wall of the area to be waterproofed on the electronic detonator. Simultaneously, it firmly bonds the inner sealing tube to the electronic detonator, forming the first reliable waterproof barrier, effectively preventing moisture from entering from the contact surface between the electronic detonator and the inner sealing tube. The outer pressure compensation tube, also made of oil-resistant nitrile rubber, is fitted over the inner sealing tube. It not only protects the inner sealing tube from damage due to external friction or impact but also forms a double layer of protection with the inner sealing tube, further enhancing the waterproofing effect. Furthermore, the water-swellable rubber particles filled inside the inner sealing tube or between the inner and outer pressure compensation tubes have an extremely high expansion ratio. When a small amount of moisture accidentally breaks through the outer protection and enters the inner area, the water-swellable rubber particles will quickly absorb the moisture and expand, filling the surrounding gaps and forming a secondary waterproof seal to prevent further diffusion of moisture. Simultaneously, the elastic O-ring tightly fastened to the outside of the outer pressure compensation tube is made of oil-resistant nitrile rubber, possessing excellent elasticity and sealing properties. This further enhances the sealing performance of the outer pressure compensation tube. Working synergistically with the composite O-ring, it ensures waterproofing of critical parts of the electronic detonator from multiple dimensions. Whether it's the connection between the detonator body and the lead wire, or the twisted joint between the lead wire and the firing line, comprehensive waterproofing protection is provided, completely solving the problem of weak waterproofing at critical parts in existing technologies. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0017] Figure 1 This is a three-dimensional structural diagram of Embodiment 1 of the present utility model; Figure 2 for Figure 1 Enlarged structural diagram at point A in the middle; Figure 3 This is a cross-sectional structural diagram of Embodiment 1 of the present utility model; Figure 4 This is a cross-sectional view of Embodiment 2 of the present invention; Figure 5 This is a three-dimensional structural diagram of the composite O-ring in this utility model; Figure 6 This is a cross-sectional view of the composite O-ring in this utility model.

[0018] In the diagram: 1. Detonator body; 2. Detonator lead wire; 3. Detonator wire; 4. Joint; 5. Inner sealing tube; 6. Outer pressure compensation tube; 7. Water-swellable rubber granules; 8. Composite O-ring; 801. Metal sheet; 802. Rubber coating layer; 9. Elastic O-ring. Detailed Implementation

[0019] The technical solution of this utility model will now be clearly and completely described in conjunction with the accompanying drawings. In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying anything.

[0020] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0021] Example 1, please refer to Figures 1 to 3 , Figure 5 , Figure 6 This utility model provides a technical solution: a waterproof device for electronic detonators used in seismic exploration wells, comprising an inner sealing tube 5, an outer pressure compensation tube 6, and multiple composite O-rings 8. The inner sealing tube 5 is fitted onto the outer wall of the area to be waterproofed by the electronic detonator, and covers the area. The outer pressure compensation tube 6 is fitted onto the outer wall of the inner sealing tube 5, and covers the inner sealing tube 5.

[0022] The composite O-ring 8 is fitted onto the outer wall of the outer pressure compensation pipe 6. The composite O-ring 8 is compressed and tightened by pressure inside the borehole, pressing against the outer pressure compensation pipe 6 and the inner sealing pipe 5.

[0023] This embodiment is applicable to strengthening the sealing and waterproofing between the detonator body 1 and the detonator lead wire 2. This electronic detonator waterproofing device achieves efficient waterproofing through a three-layer structure. The inner sealing tube 5 directly adheres to the area to be waterproofed (in this embodiment, the area to be waterproofed refers to the connection between the detonator body 1 and the detonator lead wire 2), forming the first waterproof barrier to prevent moisture intrusion. The outer pressure compensation tube 6 wraps around the inner sealing tube 5, providing protection and pressure transmission, preventing damage to the inner sealing tube 5. The composite O-ring 8 contracts under the pressure of the borehole, compressing the outer pressure compensation tube 6 and the inner sealing tube 5, allowing the inner sealing tube 5 to fit more closely to the detonator body 1 or the detonator lead wire 2, resulting in a tighter seal with increasing pressure. This ensures the reliability of the electronic detonator's waterproofing under high-pressure environments and solves the sealing failure problem of existing technologies.

[0024] Specifically, the composite O-ring 8 consists of a metal sheet 801 and a rubber coating layer 802, with the rubber coating layer 802 wrapping around the outer wall of the metal sheet 801. When the metal sheet 801 is subjected to pressure within the borehole, it deforms, causing the entire metal sheet 801 to contract and compress the outer pressure compensation pipe 6 and the inner sealing pipe 5. The metal sheet 801 is made of spring steel, possessing excellent elasticity and deformation capacity.

[0025] The rubber coating layer 802 wraps around the metal sheet 801, improving the sealing performance. Simultaneously, the rubber coating layer 802 increases friction, preventing the composite O-ring 8 from falling off due to insecure fastening. As the detonator body 1 is lowered deeper into the borehole, the pressure it bears gradually increases. The spring steel metal sheet 801 deforms and contracts under pressure, compressing the outer pressure compensation tube 6 and the inner sealing tube 5, thus enhancing the waterproofing effect of the outer pressure compensation tube 6 and the inner sealing tube 5.

[0026] Specifically, the inner wall of the inner sealing tube 5 is pre-coated with high-viscosity silicone grease, and the inner sealing tube 5 is bonded to the outer wall of the area to be waterproofed by the high-viscosity silicone grease.

[0027] Applying high-viscosity silicone grease to the inner wall of the inner sealing tube 5 allows it to adhere tightly to the outer wall of the area to be waterproofed (or the area around the area to be waterproofed) of the detonator body 1 or the detonator lead wire 2, filling tiny gaps, enhancing the sealing performance of the inner sealing tube 5, and effectively preventing moisture from entering from the contact surface.

[0028] Specifically, a waterproof device for electronic detonators used in seismic exploration wells also includes multiple elastic O-rings 9. Each elastic O-ring 9 is tightly fastened to the outer wall of the outer pressure compensation pipe 6. The elastic O-rings 9 are made of oil-resistant nitrile rubber. In actual implementation, the elastic O-rings 9 are fitted onto the outer wall of the outer pressure compensation pipe 6 and are in a taut state, tightening and compressing the outer pressure compensation pipe 6.

[0029] The elastic O-ring 9 is tightly clamped to the outside of the outer pressure compensation pipe 6, which helps to enhance the outer layer seal. Together with the composite O-ring 8, it forms multiple layers of protection to further prevent water intrusion into the drilling well. Its oil-resistant nitrile rubber material can adapt to the oil and corrosive environment of the drilling well, avoid aging and damage, and ensure that the elastic O-ring 9 can play a stable sealing role for a long time.

[0030] Specifically, the inner sealing tube 5 and the outer pressure compensation tube 6 are both made of oil-resistant nitrile rubber.

[0031] The inner sealing tube 5 is made of oil-resistant nitrile rubber, which can resist oil and corrosive substances in the well, avoid aging and damage, ensure the sealing stability of the area to be waterproofed where it is attached to the detonator, and prevent water vapor intrusion. The outer pressure compensation tube 6 is made of the same material, which can withstand harsh environments while maintaining elasticity to transmit pressure, protect the inner sealing tube 5, and ensure the long-term reliability of the overall waterproof structure.

[0032] Specifically, the composite O-ring 8 is C-shaped in general, and each composite O-ring 8 is clamped on the outer wall of the outer pressure compensation pipe 6 from multiple directions.

[0033] Among them, the composite O-ring 8 is C-shaped with an open structure, making it more easily deformable and able to contract more flexibly under pressure, effectively compressing the outer pressure compensation pipe 6 and enhancing the sealing effect. Multiple directions of clamping on the outside of the outer pressure compensation pipe 6 can evenly apply compressive force, avoiding localized weak seals and ensuring that the overall waterproof structure is subjected to balanced stress and reliable sealing within the borehole.

[0034] Specifically, the inner sealing tube 5 is filled with numerous water-swellable rubber particles 7.

[0035] The inner sealing tube 5 is filled with water-swellable rubber particles 7. If a small amount of moisture seeps into the inner layer, the particles will quickly absorb water and expand, filling the gaps inside the tube and forming a secondary waterproof barrier to prevent further diffusion of moisture. This design compensates for the potential loopholes of a single seal, significantly improves the waterproof redundancy of the inner sealing tube 5, and ensures that the area of ​​the electronic detonator to be waterproofed remains dry in the blasting well environment for a long time.

[0036] When using, fill the inner sealing tube 5 with water-swellable rubber particles 7 and complete the filling first; then evenly coat the inner walls of both ends of the inner sealing tube 5 with high-viscosity silicone grease, and then put it on the detonator body 1 and the detonator lead wire 2. The inner sealing tube 5 covers the outer wall of the area to be waterproofed, ensuring complete coverage of the area and tight bonding with silicone grease.

[0037] If it is necessary to fill the space between the inner sealing tube 5 and the outer pressure compensation tube 6 with water-swellable rubber granules 7, first evenly spread the granules on the outside of the inner sealing tube 5; then fit the outer pressure compensation tube 6 over the outside of the inner sealing tube 5, ensuring complete coverage of the inner tube (this step is not performed during the process of filling the space between the inner sealing tube 5 and the outer pressure compensation tube 6). Figure 3 (As shown in the image, it can be used selectively).

[0038] Multiple elastic O-rings 9 are tightened one by one onto the outer wall of the outer pressure compensation pipe 6 according to the design spacing.

[0039] Multiple C-shaped composite O-rings 8 are clamped onto the outer wall of the outer pressure compensation pipe 6 from multiple directions to complete the overall assembly.

[0040] Example 2, please refer to Figures 4 to 6 The main difference between this embodiment and Embodiment 1 is that the space between the inner sealing tube 5 and the outer pressure compensation tube 6 is filled with numerous water-swellable rubber particles 7.

[0041] In this second embodiment, the sealing and waterproofing of the joint 4 formed by the electrical connection of the detonator lead wire 2 and the firing wire 3 is applied. The water-swellable rubber particles 7 between the inner sealing tube 5 and the outer pressure compensation tube 6 will absorb water and expand to fill the gap between the two tubes if moisture penetrates the outer layer, preventing moisture from seeping into the inner sealing tube 5 and forming an additional waterproof barrier. Simultaneously, it enhances the fit between the two tubes, improves the overall structural stability, prevents displacement of the two tubes due to vibration within the firing well, and ensures the continuous and reliable functioning of the waterproofing device.

[0042] When using, refer to Figure 4 The inner sealing tube 5 and the outer pressure compensation tube 6 are fitted onto the detonator lead wire 2 or the blast line 3.

[0043] Connect the ends of the detonator lead wire 2 and the firing wire 3 electrically, that is, twist them together.

[0044] High-viscosity silicone grease is applied to the inner wall of the inner sealing tube 5, and then it is fitted onto the detonator lead wire 2 and the firing wire 3. The inner sealing tube 5 covers the outer wall of the area to be waterproofed (twisted joint 4), ensuring complete coverage of the area and tight bonding with silicone grease.

[0045] Water-swellable rubber granules 7 are filled between the inner sealing tube 5 and the outer pressure compensation tube 6. First, the granules are evenly laid on the outside of the inner sealing tube 5. Then, the outer pressure compensation tube 6 is sleeved on the outside of the inner sealing tube 5 to ensure complete coverage of the inner sealing tube 5.

[0046] Multiple elastic O-rings 9 are tightened one by one onto the outer wall of the outer pressure compensation pipe 6 according to the design spacing.

[0047] Multiple C-shaped composite O-rings 8 are clamped onto the outer wall of the outer pressure compensation pipe 6 from multiple directions to complete the overall assembly.

[0048] Note that due to the difference in diameter between the detonator body 1 and the detonator lead wire 2 or the firing wire 3, this technical solution requires the use of at least two sizes of composite O-rings 8, elastic O-rings 9, inner sealing tubes 5, and outer pressure compensation tubes 6 in actual implementation to accommodate the dimensional differences in the two embodiments described above. Specific dimensions will not be elaborated further, as the model of the detonator body 1 used in actual implementation varies.

[0049] It should be noted that, for those skilled in the art, it is obvious that this utility model is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this utility model is defined by the appended claims rather than the foregoing description. Therefore, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model, and no reference numerals in the claims should be construed as limiting the scope of the claims.

[0050] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A waterproof device for electronic detonators used in seismic exploration wells, characterized in that: It includes an inner sealing tube (5), an outer pressure compensation tube (6), and multiple composite O-rings (8). The inner sealing tube (5) is fitted onto the outer wall of the area to be waterproofed by the electronic detonator, and the inner sealing tube (5) covers the area to be waterproofed by the electronic detonator. The outer pressure compensation tube (6) is fitted onto the outer wall of the inner sealing tube (5), and the outer pressure compensation tube (6) covers the inner sealing tube (5). The composite O-ring (8) is fitted on the outer wall of the outer pressure compensation pipe (6); the composite O-ring (8) is compressed and tightened by pressure in the borehole to the outer pressure compensation pipe (6) and the inner sealing pipe (5).

2. The waterproof device for electronic detonators used in seismic exploration wells according to claim 1, characterized in that: The composite O-ring (8) is composed of a metal sheet (801) and a rubber coating layer (802). The rubber coating layer (802) is wrapped around the outer wall of the metal sheet (801). The metal sheet (801) deforms after being squeezed by pressure in the borehole. The metal sheet (801) shrinks and squeezes the outer pressure compensation pipe (6) and the inner sealing pipe (5) as a whole.

3. A waterproof device for electronic detonators used in seismic exploration wells according to claim 1, characterized in that: The inner wall of the inner sealing tube (5) is pre-coated with high-viscosity silicone grease, and the inner sealing tube (5) is bonded to the outer wall of the area to be waterproofed by the high-viscosity silicone grease.

4. A waterproof device for electronic detonators used in seismic exploration wells according to claim 1, characterized in that: It also includes multiple elastic O-rings (9), each of which is tightly clamped to the outer side wall of the outer pressure compensation pipe (6), and the elastic O-rings (9) are made of oil-resistant nitrile rubber material.

5. A waterproof device for electronic detonators used in seismic exploration wells according to claim 1, characterized in that: The inner sealing tube (5) and the outer pressure compensation tube (6) are both made of oil-resistant nitrile rubber.

6. A waterproof device for electronic detonators used in seismic exploration wells according to claim 1, characterized in that: The composite O-ring (8) is C-shaped in general, and each composite O-ring (8) is clamped on the outer wall of the outer pressure compensation pipe (6) from multiple directions.

7. A waterproof device for electronic detonators used in seismic exploration wells according to claim 1, characterized in that: The inner sealing tube (5) is filled with numerous water-swellable rubber particles (7).

8. A waterproof device for electronic detonators used in seismic exploration wells according to claim 1, characterized in that: Numerous water-swellable rubber particles (7) are filled between the inner sealing tube (5) and the outer pressure compensation tube (6).

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