Piezoelectric-resistant detonator for oil and gas well and detonating method thereof

Abstract

The invention discloses a pressure-resistant electric detonator for an oil-gas well. The pressure-resistant electric detonator comprises a sintering plug, an electric detonator for the oil-gas well, a reinforcing cap, a pressure-resistant shell and an expansion explosive, the sintering plug and the pressure-resistant shell are detachably assembled together; the electric detonator for the oil and gas well, the reinforcing cap and the expansion explosive are sequentially arranged in the pressure-resistant shell, the electric detonator for the oil and gas well is in lap joint with the sintering plug, a packaging area is formed between the reinforcing cap and the bottom of the pressure-resistant shell, and the expansion explosive is filled in the packaging area. According to the invention, the problem that the voltage endurance capability of the existing voltage-resistant electric detonator is limited due to an assembly mode is solved.

Description

Technical Field

[0001] This invention belongs to the field of oil and gas well perforation technology, specifically relating to pressure-resistant electric detonators for oil and gas wells, and also to a detonation method for pressure-resistant electric detonators for oil and gas wells. Background Technology

[0002] As oil and gas resource exploration and development enters its later stages, the reserves of medium and shallow oil and gas reservoirs are decreasing year by year, while the development of ultra-deep oil and gas reservoirs is increasing annually. In China, downhole operations for ultra-deep wells in oilfields generally employ gunless perforators, deploying larger-diameter gunless perforating projectiles to achieve deeper penetration to meet the needs of later-stage oil and gas well development. This method of detonation requires a pressure-resistant electric detonator. For example, the utility model patent with publication number "CN210833272U," published on June 23, 2020, entitled "A High-Resistance Electric Detonator for Perforating Oil and Gas Wells," is a suitable electric detonator. However, current plug-type pressure-resistant electric detonators have sealing grooves within their sintered shells, connected to the pressure-resistant shell via sealing rings. This connection method limits the product's pressure resistance. Summary of the Invention

[0003] The first objective of this invention is to provide a pressure-resistant electric detonator for oil and gas wells, thereby solving the problem that the pressure resistance of existing pressure-resistant electric detonators is limited due to their assembly method.

[0004] To achieve the above objectives, the technical solution adopted in this invention is as follows: a pressure-resistant electric detonator for oil and gas wells, comprising a sintered plug, an electric detonator for oil and gas wells, a reinforcing cap, a pressure-resistant shell, and an energy-expanding explosive; the sintered plug and the pressure-resistant shell are detachably assembled together; the electric detonator for oil and gas wells, the reinforcing cap, and the energy-expanding explosive are arranged sequentially inside the pressure-resistant shell, wherein: the electric detonator for oil and gas wells overlaps with the sintered plug, an encapsulation area is formed between the reinforcing cap and the bottom of the pressure-resistant shell, and the energy-expanding explosive is filled in the encapsulation area.

[0005] As a preferred technical solution of the present invention, the sintered plug includes a sintered shell, a sintered body and two copper pins; the sintered body is disposed inside the sintered shell, and the two copper pins are inserted from the sintered body and connected to the two leads of the electric detonator for oil and gas wells; one end of the sintered shell is detachably assembled with one end of the pressure-resistant shell.

[0006] As a preferred embodiment of the present invention, one end of the sintered shell is threadedly assembled with one end of the pressure-resistant shell.

[0007] As a preferred embodiment of the present invention, one end of the sintered shell is provided with an internal thread, and one end of the pressure-resistant shell is provided with an external thread.

[0008] As a preferred embodiment of the present invention, a sealing ring is provided at the connection between the sintered body and the pressure-resistant shell.

[0009] As a preferred embodiment of the present invention, the sealing ring is an O-ring.

[0010] As a preferred embodiment of the present invention, the sintered body is a ceramic sintered body.

[0011] The second objective of this invention is to provide a detonation method for pressure-resistant electric detonators used in oil and gas wells, thereby solving the problem that the pressure resistance of existing pressure-resistant electric detonators is limited due to their assembly method.

[0012] To achieve the above objectives, the technical solution adopted in this invention is as follows: A detonation method for a pressure-resistant electric detonator for oil and gas wells. When the pressure-resistant electric detonator is lowered into a predetermined layer within the oil and gas well along with the perforating gun, current is passed through the copper pin position, creating a circuit between the electric detonator installed in the sintered plug and the pressure-resistant shell. The current flows through the bridge wire of the electric detonator for a certain period, generating heat and igniting the explosive on the bridge wire, thus initiating the detonation. After detonation, the detonation wave detonates the detonating cord at the output end through the energy-expanding explosive, completing the detonation operation. The beneficial effects of the present invention are: (1) The basic detonator charge of the oil and gas well pressure-resistant electric detonator of the present invention is the same as that of the ordinary oil and gas well electric detonator, which can realize the commonality of parts and improve the standardization among various products; (2) The oil and gas well pressure-resistant electric detonator of the present invention connects the sintered plug and the pressure-resistant shell by thread, which is more conducive to improving the sealing effect of the oil and gas well pressure-resistant electric detonator. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of a pressure-resistant electric detonator for oil and gas wells according to the present invention; Figure 2 This is a schematic diagram of the sintered plug in a pressure-resistant electric detonator for oil and gas wells according to the present invention; Figure 3 This is a schematic diagram of the structure of the pressure-resistant shell in a pressure-resistant electric detonator for oil and gas wells according to the present invention.

[0014] In the figure, 1. Sintered plug, 101. Sintered shell, 102. Sintered body, 103. Copper pin, 2. Sealing ring, 3. Electric detonator for oil and gas wells, 301. Lead wire, 302. Bridge wire, 4. Reinforcing cap, 5. Pressure resistant shell, 6. Energy-enhancing explosive. Detailed Implementation

[0015] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0016] Example 1 like Figure 1As shown, a pressure-resistant electric detonator for oil and gas wells according to the present invention includes a sintered plug 1, an electric detonator 3 for oil and gas wells, a reinforcing cap 4, a pressure-resistant shell 5, and an energy-expanding explosive 6; the sintered plug 1 is detachably assembled with the pressure-resistant shell 5; the electric detonator 3 for oil and gas wells, the reinforcing cap 4, and the energy-expanding explosive 6 are arranged sequentially inside the pressure-resistant shell 5, wherein: the electric detonator 3 for oil and gas wells overlaps with the sintered plug 1, an encapsulation area is formed between the reinforcing cap 4 and the bottom of the pressure-resistant shell 5, and the energy-expanding explosive 6 is filled in the encapsulation area.

[0017] The assembly process of this invention is completed under high temperature conditions, wherein: the copper pin 103, the sintered body 102, and the sintered shell 101 are sintered into a sintered plug 1, and the sintered plug 1 is connected to the electric detonator 3 for oil and gas wells by welding; after the energy-expanding explosive 6 and the reinforcing cap 4 are sequentially loaded into the pressure-resistant shell 5, the finished product of welding the sintered plug 1 and the electric detonator 3 for oil and gas wells is connected to the pressure-resistant shell 5 by threads to complete the final assembly.

[0018] When performing perforation operations, the pressure-resistant electric detonator of the present invention is installed into the head of the perforation gun, and the protruding part of the pressure-resistant detonating cord on the shellless ammunition rack plate is inserted into the tail of the pressure-resistant shell, and then sealed tightly with high-temperature resistant high-pressure tape.

[0019] The working process of this invention is as follows: When the pressure-resistant electric detonator is lowered into the oil and gas well with the perforation gun, it withstands the high temperature and high pressure environment of the liquid in the well. When it reaches the predetermined layer, current is passed through the copper pin 101 to form a circuit in the electric detonator 3 for oil and gas wells. After the current passes through the bridge wire 302 of the electric detonator 3 for a certain period of time, it heats up and ignites the agent on the bridge wire, causing detonation. After the electric detonator 3 for oil and gas wells detonates, the detonation wave detonates the output detonating cord through the energy-expanding explosive 6, completing the detonation operation.

[0020] Example 2 like Figure 1 As shown in Example 1, Example 2 of the present invention provides a pressure-resistant electric detonator for oil and gas wells, which also includes a sintered plug 1, an electric detonator 3 for oil and gas wells, a reinforcing cap 4, a pressure-resistant shell 5, and an energy-expanding explosive 6. The sintered plug 1 is detachably assembled with the pressure-resistant shell 5. The electric detonator 3 for oil and gas wells, the reinforcing cap 4, and the energy-expanding explosive 6 are arranged sequentially inside the pressure-resistant shell 5, wherein the electric detonator 3 for oil and gas wells overlaps with the sintered plug 1, and an encapsulation area is formed between the reinforcing cap 4 and the bottom of the pressure-resistant shell 5, and the energy-expanding explosive 6 is filled in the encapsulation area.

[0021] like Figure 2As shown, unlike Embodiment 1, in Embodiment 2 of the present invention, a pressure-resistant electric detonator for oil and gas wells includes a sintered plug 1 comprising a sintered shell 101, a sintered body 102, and two copper pins 103. The sintered body 102 is disposed within the sintered shell 101, and the two copper pins 103 are inserted from within the sintered body and connected to the two leads 301 of the electric detonator 3 for oil and gas wells. One end of the sintered shell 101 is detachably assembled with one end of the pressure-resistant shell 5. The assembly process of this invention is completed under high temperature conditions, wherein: the copper pin 103, the sintered body 102, and the sintered shell 101 are sintered into a sintered plug 1, and the sintered plug 1 is connected to the electric detonator 3 for oil and gas wells by welding; after the energy-expanding explosive 6 and the reinforcing cap 4 are sequentially loaded into the pressure-resistant shell 5, the finished product of welding the sintered plug 1 and the electric detonator 3 for oil and gas wells is connected to the pressure-resistant shell 5 by threads to complete the final assembly.

[0022] When performing perforation operations, the pressure-resistant electric detonator of the present invention is installed into the head of the perforation gun, and the protruding part of the pressure-resistant detonating cord on the shellless ammunition rack plate is inserted into the tail of the pressure-resistant shell, and then sealed tightly with high-temperature resistant high-pressure tape.

[0023] The working process of this invention is as follows: When the pressure-resistant electric detonator is lowered into the oil and gas well with the perforation gun, it withstands the high temperature and high pressure environment of the liquid in the well. When it reaches the predetermined layer, current is passed through the copper pin 101 to form a circuit in the electric detonator 3 for oil and gas wells. After the current passes through the bridge wire 302 of the electric detonator 3 for a certain period of time, it heats up and ignites the agent on the bridge wire, causing detonation. After the electric detonator 3 for oil and gas wells detonates, the detonation wave detonates the output detonating cord through the energy-expanding explosive 6, completing the detonation operation.

[0024] Example 3 like Figure 1 As shown in Example 2, Example 3 of the present invention, a pressure-resistant electric detonator for oil and gas wells, also includes a sintered plug 1, an electric detonator 3 for oil and gas wells, a reinforcing cap 4, a pressure-resistant shell 5, and an energy-expanding explosive 6. The sintered plug 1 is detachably assembled with the pressure-resistant shell 5. The electric detonator 3, the reinforcing cap 4, and the energy-expanding explosive 6 are arranged sequentially inside the pressure-resistant shell 5, wherein: the electric detonator 3 overlaps with the sintered plug 1, and an encapsulation area is formed between the reinforcing cap 4 and the bottom of the pressure-resistant shell 5, and the energy-expanding explosive 6 is filled in the encapsulation area. Figure 3 As shown, the sintered plug 1 includes a sintered shell 101, a sintered body 102 and two copper pins 103; the sintered body 102 is disposed inside the sintered shell 101, and the two copper pins 103 are inserted from the sintered body and connected to the two leads 301 of the electric detonator 3 for oil and gas wells; one end of the sintered shell 101 is detachably assembled with one end of the pressure-resistant shell 5.

[0025] like Figure 2 and Figure 3As shown, unlike Example 2, in Example 3 of the present invention, a pressure-resistant electric detonator for oil and gas wells, one end of the sintered shell 101 is provided with an internal thread, and one end of the pressure-resistant shell 5 is provided with an external thread; or one end of the sintered shell 101 is provided with an external thread, and one end of the pressure-resistant shell 5 is provided with an internal thread. The one end of the sintered shell 101 and the one end of the pressure-resistant shell 5 are threaded together, making assembly and disassembly more convenient.

[0026] The assembly process of this invention is completed under high temperature conditions, wherein: the copper pin 103, the sintered body 102, and the sintered shell 101 are sintered into a sintered plug 1, and the sintered plug 1 is connected to the electric detonator 3 for oil and gas wells by welding; after the energy-expanding explosive 6 and the reinforcing cap 4 are sequentially loaded into the pressure-resistant shell 5, the finished product of welding the sintered plug 1 and the electric detonator 3 for oil and gas wells is connected to the pressure-resistant shell 5 by threads to complete the final assembly.

[0027] When performing perforation operations, the pressure-resistant electric detonator of the present invention is installed into the head of the perforation gun, and the protruding part of the pressure-resistant detonating cord on the shellless ammunition rack plate is inserted into the tail of the pressure-resistant shell, and then sealed tightly with high-temperature resistant high-pressure tape.

[0028] The working process of this invention is as follows: When the pressure-resistant electric detonator is lowered into the oil and gas well with the perforation gun, it withstands the high temperature and high pressure environment of the liquid in the well. When it reaches the predetermined layer, current is passed through the copper pin 101 to form a circuit in the electric detonator 3 for oil and gas wells. After the current passes through the bridge wire 302 of the electric detonator 3 for a certain period of time, it heats up and ignites the agent on the bridge wire, causing detonation. After the electric detonator 3 for oil and gas wells detonates, the detonation wave detonates the output detonating cord through the energy-expanding explosive 6, completing the detonation operation.

[0029] Example 4 like Figure 1 As shown in Example 4, similar to Example 3, an oil and gas well pressure-resistant electric detonator of the present invention also includes a sintered plug 1, an oil and gas well electric detonator 3, a reinforcing cap 4, a pressure-resistant shell 5, and an energy-expanding explosive 6; the sintered plug 1 and the pressure-resistant shell 5 are detachably assembled together; the oil and gas well electric detonator 3, the reinforcing cap 4, and the energy-expanding explosive 6 are arranged sequentially inside the pressure-resistant shell 5, wherein: the oil and gas well electric detonator 3 overlaps with the sintered plug 1, and an encapsulation area is formed between the reinforcing cap 4 and the bottom of the pressure-resistant shell 5, and the energy-expanding explosive 6 is filled in the encapsulation area. Figure 3 As shown, the sintered plug 1 includes a sintered shell 101, a sintered body 102, and two copper pins 103; the sintered body 102 is disposed inside the sintered shell 101, and the two copper pins 103 are inserted into the sintered body and connected to the two leads 301 of the electric detonator 3 for oil and gas wells; one end of the sintered shell 101 is detachably assembled with one end of the pressure-resistant shell 5. Figure 2 and Figure 3As shown, one end of the sintered shell 101 is provided with an internal thread, and one end of the pressure-resistant shell 5 is provided with an external thread; or one end of the sintered shell 101 is provided with an external thread, and one end of the pressure-resistant shell 5 is provided with an internal thread. One end of the sintered shell 101 and one end of the pressure-resistant shell 5 are threaded together, making disassembly and assembly relatively convenient.

[0030] like Figure 2 and Figure 3 As shown, unlike Example 3, in Example 4 of the present invention, a pressure-resistant electric detonator for oil and gas wells is provided with a sealing ring 2 at the connection between the sintered body 101 and the pressure-resistant shell 5. The sealing ring 2 is an O-ring, which can ensure the airtightness of the pressure-resistant electric detonator for oil and gas wells.

[0031] The assembly process of this invention is completed under high temperature conditions, wherein: the copper pin 103, the sintered body 102, and the sintered shell 101 are sintered into a sintered plug 1, and the sintered plug 1 is connected to the electric detonator 3 for oil and gas wells by welding; after the energy-expanding explosive 6 and the reinforcing cap 4 are sequentially loaded into the pressure-resistant shell 5, the finished product of welding the sintered plug 1 and the electric detonator 3 for oil and gas wells is connected to the pressure-resistant shell 5 by threads to complete the final assembly.

[0032] When performing perforation operations, the pressure-resistant electric detonator of the present invention is installed into the head of the perforation gun, and the protruding part of the pressure-resistant detonating cord on the shellless ammunition rack plate is inserted into the tail of the pressure-resistant shell, and then sealed tightly with high-temperature resistant high-pressure tape.

[0033] The working process of this invention is as follows: When the pressure-resistant electric detonator is lowered into the oil and gas well with the perforation gun, it withstands the high temperature and high pressure environment of the liquid in the well. When it reaches the predetermined layer, current is passed through the copper pin 101 to form a circuit in the electric detonator 3 for oil and gas wells. After the current passes through the bridge wire 302 of the electric detonator 3 for a certain period of time, it heats up and ignites the agent on the bridge wire, causing detonation. After the electric detonator 3 for oil and gas wells detonates, the detonation wave detonates the output detonating cord through the energy-expanding explosive 6, completing the detonation operation.

[0034] Example 5 like Figure 1 As shown in Example 4, Example 5 of the present invention, a pressure-resistant electric detonator for oil and gas wells, also includes a sintered plug 1, an electric detonator 3 for oil and gas wells, a reinforcing cap 4, a pressure-resistant shell 5, and an energy-expanding explosive 6; the sintered plug 1 and the pressure-resistant shell 5 are detachably assembled together; the electric detonator 3, the reinforcing cap 4, and the energy-expanding explosive 6 are arranged sequentially inside the pressure-resistant shell 5, wherein: the electric detonator 3 overlaps with the sintered plug 1, and an encapsulation area is formed between the reinforcing cap 4 and the bottom of the pressure-resistant shell 5, and the energy-expanding explosive 6 is filled in the encapsulation area. Figure 3As shown, the sintered plug 1 includes a sintered shell 101, a sintered body 102, and two copper pins 103; the sintered body 102 is disposed inside the sintered shell 101, and the two copper pins 103 are inserted into the sintered body and connected to the two leads 301 of the electric detonator 3 for oil and gas wells; one end of the sintered shell 101 is detachably assembled with one end of the pressure-resistant shell 5. Figure 2 and Figure 3 As shown, one end of the sintered shell 101 is provided with an internal thread, and one end of the pressure-resistant shell 5 is provided with an external thread; or one end of the sintered shell 101 is provided with an external thread, and one end of the pressure-resistant shell 5 is provided with an internal thread. The threads of one end of the sintered shell 101 and one end of the pressure-resistant shell 5 are connected together, making assembly and disassembly convenient. A sealing ring 2, which is an O-ring, is provided at the connection between the sintered shell 101 and the pressure-resistant shell 5 to ensure the airtightness of the pressure-resistant electric detonator for oil and gas wells.

[0035] like Figure 2 and Figure 3 As shown, unlike Example 4, in Example 5 of the present invention, the sintered body 101 is a ceramic sintered body made of ceramic material, which has good insulation and pressure resistance properties.

[0036] The assembly process of this invention is completed under high temperature conditions, wherein: the copper pin 103, the sintered body 102, and the sintered shell 101 are sintered into a sintered plug 1, and the sintered plug 1 is connected to the electric detonator 3 for oil and gas wells by welding; after the energy-expanding explosive 6 and the reinforcing cap 4 are sequentially loaded into the pressure-resistant shell 5, the finished product of welding the sintered plug 1 and the electric detonator 3 for oil and gas wells is connected to the pressure-resistant shell 5 by threads to complete the final assembly.

[0037] When performing perforation operations, the pressure-resistant electric detonator of the present invention is installed into the head of the perforation gun, and the protruding part of the pressure-resistant detonating cord on the shellless ammunition rack plate is inserted into the tail of the pressure-resistant shell, and then sealed tightly with high-temperature resistant high-pressure tape.

[0038] The working process of this invention is as follows: When the pressure-resistant electric detonator is lowered into the oil and gas well with the perforation gun, it withstands the high temperature and high pressure environment of the liquid in the well. When it reaches the predetermined layer, current is passed through the copper pin 101 to form a circuit in the electric detonator 3 for oil and gas wells. After the current passes through the bridge wire 302 of the electric detonator 3 for a certain period of time, it heats up and ignites the agent on the bridge wire, causing detonation. After the electric detonator 3 for oil and gas wells detonates, the detonation wave detonates the output detonating cord through the energy-expanding explosive 6, completing the detonation operation.

[0039] Example 6 The present invention discloses a detonation method for a pressure-resistant electric detonator for oil and gas wells, specifically as follows: when the pressure-resistant electric detonator 3 is lowered into a predetermined layer in the oil and gas well along with the perforating gun, current is passed through the copper pin 103 to form a circuit between the electric detonator 3 installed in the sintered plug 1 and the pressure-resistant shell 5. After the current passes through the bridge wire 302 of the electric detonator 3 for a certain period of time, it heats up and ignites the agent on the bridge wire, causing detonation. After the electric detonator 3 detonates, the detonation wave detonates the output detonating cord through the energy-expanding explosive 6, completing the detonation operation.

Claims

1. A pressure-resistant electric detonator for oil and gas wells, characterized in that, The device includes a sintered plug (1), an electric detonator (3) for oil and gas wells, a reinforcing cap (4), a pressure-resistant shell (5), and an energy-expanding explosive (6). The sintered plug (1) and the pressure-resistant shell (5) are detachably assembled together. The electric detonator (3), the reinforcing cap (4), and the energy-expanding explosive (6) are arranged sequentially inside the pressure-resistant shell (5), wherein the electric detonator (3) for oil and gas wells overlaps with the sintered plug (1), and an encapsulation area is formed between the reinforcing cap (4) and the bottom of the pressure-resistant shell (5), and the energy-expanding explosive (6) is filled in the encapsulation area.

2. The pressure-resistant electric detonator for oil and gas wells according to claim 1, characterized in that, The sintered plug (1) includes a sintered shell (101), a sintered body (102), and two copper pins (103); the sintered body (102) is disposed inside the sintered shell (101), and the two copper pins (103) are inserted from the sintered body and connected to the two leads (301) of the electric detonator (3) for oil and gas wells. One end of the sintered shell (101) is detachably assembled with one end of the pressure-resistant shell (5).

3. The pressure-resistant electric detonator for oil and gas wells according to claim 1, characterized in that, One end of the sintered shell (101) is threaded together with one end of the pressure-resistant shell (5).

4. The pressure-resistant electric detonator for oil and gas wells according to claim 2, characterized in that, One end of the sintered shell (101) is provided with an internal thread, and one end of the pressure-resistant shell (5) is provided with an external thread.

5. The pressure-resistant electric detonator for oil and gas wells according to claim 2, characterized in that, A sealing ring (2) is provided at the connection between the sintered body (101) and the pressure-resistant shell (5).

6. The pressure-resistant electric detonator for oil and gas wells according to claim 5, characterized in that, The sealing ring (2) is an O-ring.

7. The pressure-resistant electric detonator for oil and gas wells according to claim 2, characterized in that, The sintered body (101) is a ceramic sintered body.

8. The detonation method for the pressure-resistant electric detonator for oil and gas wells according to any one of claims 2-7, characterized in that, When the pressure-resistant electric detonator (3) is lowered into the predetermined layer in the oil and gas well with the perforating gun, current is passed through the copper pin (103) to form a circuit between the oil and gas well electric detonator (3) installed in the sintered plug (1) and the pressure-resistant shell (5). After the current passes through the bridge wire (302) of the oil and gas well electric detonator (3) for a certain period of time, it heats up and causes the agent on the bridge wire to ignite, resulting in detonation. After the oil and gas well electric detonator (3) detonates, the detonation wave detonates the output detonating cord through the energy-expanding explosive (6), completing the detonation operation.

Images