Ignition bridge plug and use method thereof

Abstract

The invention relates to an ignition bridge plug and a using method thereof, and belongs to the field of well completion tools, the ignition bridge plug comprises a bridge plug body and an ignition head, the bridge plug body comprises a center pipe, the center pipe is provided with a center flow channel, a piston shell is fixed to the bottom end of the center pipe, and the interior of the piston shell is communicated with the center flow channel; an ignition head is arranged at the front end of the bridge plug body and comprises a piston, a firing pin and a detonator, a piston shell comprises a cavity, and the piston is temporarily bound on the upper portion of the cavity of the piston shell; the firing pin is fixed at the lower part of the piston; the detonator is fixed on the inner wall of the bottom of the piston shell and is opposite to the firing pin; wherein a central flow channel of the central pipe is used as a channel for a pressurized medium to flow through so as to impact the piston and enable the piston to move forwards; when the piston is impacted by a pressurized medium, the shear pin is firstly sheared off, and then the firing pin is driven to move forwards; the firing pin moves forwards until the detonator is struck; ignition is realized after the detonator is impacted.

Description

Technical Field

[0001] The invention relates to a well completion tool, in particular to an ignition bridge plug and a use method thereof. Background Art

[0002] Fracturing is an effective means to transform reservoirs and increase production and injection. Drawing on the successful experience of shale gas in the United States, volume fracturing is currently the main means of increasing production for the efficient development of unconventional oil and gas resources. Especially for shale gas and deep coalbed methane, the extreme volume horizontal well staged fracturing technology system of "dense cutting + large displacement + combined proppant + pre-acid + sticky and slippery water" is mainly used.

[0003] However, conventional fracturing operations require a large amount of water resources, and China faces the following problems: (1) Water resources are scarce, and large-scale hydraulic fracturing is unsustainable. my country's per capita water resources are only 2,100 cubic meters, less than 1 / 10 of the United States. In the northwestern mountainous areas, water resources are even scarcer, and water supply is difficult, which seriously restricts the progress of operations and makes economic development difficult. (2) Large-scale fracturing fluid entering the formation is prone to cause problems such as coal powder, water sensitivity, water lock, and scaling, which affects the pore conductivity and causes great damage to the reservoir. In addition, the large amount of liquid leads to a long drainage time, and the initial liquid volume is large and the later liquid volume is small, which requires a high wide-range operating capacity of the drainage equipment, and the pressure of well repair and pump replacement is high, making drainage difficult. (3) The return fluid and production waste liquid have a large amount of water and complex composition. The liquid contains solid particles, metal ions, and chemical agents of different components, which can easily cause potential harm to the environment. In addition, it is difficult to treat production water. Although the return fluid has been partially compounded, there are still process and cost problems.

[0004] High-energy gas fracturing technology relies on the pulse energy generated by high-energy gas and high-energy particles, or the pulse energy generated by mechanical structures to achieve fracturing. It is one of the strong dynamic load reservoir transformation technologies. It mainly includes three processes: one is to lower the cable into the high-energy gas generator and ignite it through the ground power supply; the second is to lower the oil pipe into the generator and use the casting rod to impact and ignite; the third is the process of solid charge igniting liquid charge. The advantages of this type of technology are that it does not require large equipment, does not require sand and water sources, does not require drainage after compression, and the process is simple and low in cost. The disadvantages are that the charge is mainly limited to the wellbore, the amount of charge is limited, and the crack length is relatively short; the cementing quality requirements are high, which limits the application in certain well conditions; the technical operation is relatively difficult, and safety needs to be focused on.

[0005] In summary, the key to limiting the application of high-energy gas fracturing technology in large-scale reservoir transformation and maintaining safety and simplicity is the lack of an ignition bridge plug, which is set in the contact area between the liquid high-energy material and the fracturing fluid and has an ignition function. It is the basis for implementing the in-situ gas fracturing method in the reservoir. Summary of the invention

[0006] In view of the above problems, the purpose of the present invention is to provide an ignition bridge plug and a method of using the same, so as to solve the problem that the lack of an ignition bridge plug limits the application of high-energy gas fracturing technology in large-scale reservoir reconstruction.

[0007] To achieve the above object, the present invention adopts the following technical solutions: In a first aspect, the present invention discloses an ignition bridge plug, comprising a bridge plug body, wherein the bridge plug body comprises a central tube, the central tube has a central flow channel, a piston housing is fixed to the bottom end of the central tube, and the interior of the piston housing is in communication with the central flow channel; The front end of the bridge plug body is provided with an ignition head, and the ignition head includes a piston, a firing pin and a detonator. The piston housing includes a cavity, and the piston is temporarily restrained in the upper part of the cavity of the piston housing; The firing pin is fixed to the lower part of the piston; The detonator penetrates and is fixed to the bottom of the piston housing and is directly opposite to the firing pin; The central flow channel of the central pipe is provided with a one-way valve, which only allows the pressure to be transmitted in one direction from top to bottom, and is used as a channel for the circulation of pressurized medium to impact the piston and make it move forward, and at the same time serves as a barrier to isolate the wellbore pressure below the bridge plug; When the piston is impacted by the pressurized medium, the shear pin is first cut off, and then the firing pin is driven to move forward; the firing pin moves forward until it hits the detonator; after the detonator is hit, sparks are generated, and the sparks move forward to ignite.

[0008] Furthermore, the bridge plug body also includes a push ring, an upper slip, an upper cone, a rubber sleeve, a lower cone, a lower slip and a fixing ring. The push ring and the fixing ring are respectively arranged at two ends of the central tube, and the push ring can be slidably sleeved on the top end of the central tube, and the fixing ring is fixed on the bottom end of the central tube; The rubber sleeve is sleeved on the outer wall of the middle part of the central tube; The upper cone and the lower cone are respectively arranged at two ends of the rubber cylinder; The upper slip is arranged between the push ring and the upper cone; The lower slip is arranged between the lower cone and the fixing ring.

[0009] Specifically, the ignition bridge plug is used in conjunction with a setting tool; A sealing tool butt end is fixed to the top of the center tube, the sealing tool butt end has a central flow channel, and the central flow channel of the sealing tool butt end is connected to the central flow channel of the center tube; The inner wall of the upper part of the central flow channel at the butt end of the setting tool is provided with an internal thread, a push rod is provided inside the setting tool, the bottom end of the push rod is provided with an external thread, and the bottom end of the push rod is connected to the upper part of the central flow channel at the butt end of the setting tool through a thread; The lower part of the sealing tool is provided with a push tube. When the bottom end of the push rod is threadedly connected with the upper part of the central flow channel of the butt end of the sealing tool, the push tube at the lower part of the sealing tool just abuts against and aligns with the top end of the bridge plug body.

[0010] Furthermore, the inner wall below the internal thread of the butt end of the sealing tool is provided with a weak point that is easy to break.

[0011] Furthermore, the piston is temporarily restrained on the inner wall of the upper part of the cavity of the piston housing by two shear pins.

[0012] Furthermore, the inner diameter of the cavity of the piston shell is larger than the inner diameter of the central flow channel of the center tube, and a step is provided at the junction of the cavity of the piston shell and the central flow channel of the center tube to prevent the piston from entering the central flow channel of the center tube from the cavity of the piston shell.

[0013] Furthermore, a one-way valve is provided at the connection between the butt end of the sealing tool and the central flow channel of the central pipe, and the one-way valve is used to only allow the medium to be transmitted from top to bottom, but not to allow the medium to be transmitted from bottom to top.

[0014] Furthermore, the bridge plug body and the ignition head are both made of easy-to-drill materials.

[0015] In a second aspect, the present invention also discloses a method for using the ignition bridge plug, comprising: Step 1: Rotate the push rod of the setting tool so that the bottom end of the push rod of the setting tool is connected with the upper part of the central flow channel of the docking end of the setting tool through threads, until the push tube at the lower part of the setting tool just abuts against and aligns with the top end of the bridge plug body, thus completing the docking of the setting tool and the ignition bridge plug; Step 2: transport the setting tool via the cable, lower the ignition bridge plug into the wellbore to a predetermined depth, so as to ensure that the detonator of the piston shell of the ignition bridge plug is immersed in the liquid high-energy material in the wellbore; Step 3: The push tube of the setting tool moves downward to push the push ring; the push ring pushes the upper cone downward through the upper slip, and the upper cone squeezes the rubber tube downward, and the rubber tube expands outward until it is tightly attached to the inner wall of the wellbore and fixed, thereby achieving the setting of the bridge plug; Step 4: The tension between the push rod of the setting tool and the butt end of the setting tool continues to increase until the easily broken weak point of the butt end of the setting tool breaks, and the setting tool is pulled out by the cable; Step 5: Pressurizing at the wellhead, the pressurized medium passes through the central flow channel of the central tube and impacts the piston. When the piston is impacted by the pressurized medium, the shear pin is first sheared off, and then the firing pin is driven to move forward; the firing pin moves forward until it hits the detonator; after the detonator is hit, sparks are generated, and the sparks move forward to ignite; Step 6: The detonator is ignited to detonate the liquid high-energy material in the wellbore and hydraulic fractures, generating a large amount of high-energy gas to achieve reservoir transformation; Step 7: Drill out the ignition bridge plug by lowering the drilling tool to clear the horizontal well.

[0016] Among them, in step six, during the detonation after the detonator is ignited, the step at the junction of the cavity of the piston shell and the central flow channel of the central tube always blocks the piston from entering the central flow channel of the central tube from the cavity of the piston shell, and the piston is always constrained at the step, forming a first protective barrier for the high-pressure and high-energy gas generated after the explosion; the one-way valve always limits the transmission of the medium from bottom to top, forming a second protective barrier for the high-pressure and high-energy gas generated after the explosion.

[0017] Compared with the prior art, the present invention has the following beneficial effects: (I) The present invention discloses an ignition bridge plug, including a bridge plug body and an ignition head, wherein the ignition head is arranged at the front end of the bridge plug body; the bridge plug body includes a central tube, the central tube has a central flow channel, a piston shell is fixed at the bottom end thereof, and the piston shell is connected with the central flow channel; the ignition head includes a piston, a firing pin and a detonator, the piston shell includes a cavity, and the piston is temporarily restrained at the upper part of the cavity of the piston shell; the firing pin is fixed at the lower part of the piston; the detonator is fixed on the inner wall at the bottom of the piston shell and is directly opposite to the firing pin; wherein, the central flow channel of the central tube is used as a channel for the circulation of a pressurized medium to impact the piston and make it move forward; when the piston is impacted by the pressurized medium, the shear pin is first sheared off, and then the firing pin is driven to move forward; the firing pin moves forward until it hits the detonator; after the detonator is impacted, sparks are generated, and the sparks are forward to realize ignition. Therefore, the ignition bridge plug disclosed by the present invention can ignite liquid high-energy materials in the reservoir section wellbore and formation fractures by wellhead pressurization.

[0018] (ii) The present invention discloses an ignition bridge plug, which is designed with two protective barriers to prevent high-energy and high-pressure gases from returning to the upper part of the wellbore after the explosion of liquid high-energy materials below the ignition bridge plug. The step at the junction of the cavity of the piston shell and the central flow channel of the central tube always blocks the piston from entering the central flow channel of the central tube from the cavity of the piston shell, and the piston is always constrained at the step, forming a first protective barrier; the one-way valve always limits the transmission of the medium from bottom to top, forming a second protective barrier. The first protective barrier and the second protective barrier jointly isolate the high-pressure and high-energy gases generated after the explosion. Therefore, the ignition bridge plug disclosed in the present invention can serve as a protective barrier during the combustion and explosion of liquid high-energy materials, isolate the high-energy gas pressure below from the wellbore above, and ensure the safety of the upper wellbore and the ground wellhead device.

[0019] (III) The present invention discloses a method for using an ignition bridge plug, which can ignite liquid high-energy materials in the reservoir section wellbore and formation fractures by wellhead pressurization, and can serve as a protective barrier during the explosion of liquid high-energy materials to isolate the high-energy gas pressure below from the wellbore above, thereby ensuring the safety of the upper wellbore and ground wellhead devices. The method for using an ignition bridge plug disclosed in the present invention can realize large-scale reservoir transformation and large-scale in-situ high-energy gas fracturing in the layer with safe and simple operation, and is the key to realizing large-scale in-situ high-energy gas fracturing in the layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a longitudinal structural view of an ignition bridge plug provided in Example 1 of the present invention; Figure 2 2 is a schematic diagram of the structure of the bridge plug body and the setting tool connected to each other provided in Example 2 of the present invention; Figure 3 Schematic diagram of the detonator of the ignition bridge plug provided in Example 2 of the present invention immersed in the liquid high-energy material; Figure 4 It is a schematic diagram of the piston provided in Example 2 of the present invention immediately shearing off the shear pin and getting rid of the temporary restraint when being impacted by the pressurized medium; Figure 5 It is a schematic diagram of igniting and detonating liquid high-energy material with a detonator provided in Example 2 of the present invention.

[0021] Description of reference numerals: 100 - setting tool, 101 - push rod, 102 - push cylinder; 200-wellbore, 300-fracturing fluid, 400-liquid high-energy material; 1-center tube, 11-piston housing, 12-butt end of setting tool, 121-internal thread, 122-weak point that is easy to break; 13-push ring, 14-upper slip, 15-upper cone, 16-rubber cylinder, 17-lower cone, 18-lower slip, 19-fixing ring; 2- ignition head, 20- shear pin, 21- piston, 22- firing pin, 23- detonator.

[0022] 3- Check valve. DETAILED DESCRIPTION

[0023] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0024] Example 1: An ignition bridge plug Embodiment 1 of the present invention provides an ignition bridge plug for use with a setting tool 100, and its structure is described in detail below with reference to the accompanying drawings.

[0025] refer to Figure 1 The ignition bridge plug comprises a bridge plug body and an ignition head 2, and the ignition head 2 is arranged at the front end of the bridge plug body.

[0026] The bridge plug body comprises a central tube 1, the central tube 1 has a central flow channel, a piston housing 11 is fixed to the bottom end of the central tube 1, and the interior of the piston housing 11 is connected to the central flow channel; The ignition head 2 includes a piston 21, a firing pin 22 and a detonator 23. The piston housing 11 includes a cavity, and the piston 21 is temporarily restrained in the upper part of the cavity of the piston housing 11; The firing pin 22 is fixed to the lower part of the piston 21; The detonator 23 penetrates and is fixed to the bottom of the piston housing 11 and is directly opposite to the firing pin 22; The central flow channel of the central tube 1 is used as a channel for the circulation of the pressurized medium to impact the piston 21 and make it move forward; When the piston 21 is impacted by the pressurized medium, the shear pin is first cut off, and then the firing pin 22 is driven to move forward; the firing pin 22 moves forward until it hits the detonator 23; after the detonator 23 is hit, sparks are generated, and the sparks move forward to realize ignition.

[0027] In order to ensure that the sparks generated by the detonator after impact can smoothly extend into the liquid high-energy material, the detonator runs through the bottom of the piston shell.

[0028] As a specific implementation, the bridge plug body further includes a push ring 13, an upper slip 14, an upper cone 15, a rubber cylinder 16, a lower cone 17, a lower slip 18 and a fixing ring 19. The push ring 13 and the fixing ring 19 are respectively arranged at the two ends of the central tube 1, and the push ring 13 can be slidably sleeved on the top end of the central tube 1, and the fixing ring 19 is fixed on the bottom end of the central tube 1; The rubber cylinder 16 is sleeved on the outer wall of the middle part of the central tube 1; The upper cone 15 and the lower cone 17 are respectively arranged at the two ends of the rubber cylinder 16; The upper slip 14 is arranged between the push ring 13 and the upper cone 15; The lower slip 18 is arranged between the lower cone 17 and the fixing ring 19 .

[0029] The upper slip 14 and the lower slip 18 are respectively located on the side of the push ring 13 and the fixing ring 19 away from the rubber cylinder 16, and are used to axially fix the bridge plug body and drive the push ring 13 and the fixing ring 19 to move toward the rubber cylinder 16. After the rubber cylinder 16 is squeezed by the upper cone 15 above and the lower cone 17 below, its lower radial expansion fixes the ignition bridge plug and realizes radial fixation, such as Figure 4 Therefore, the bridge plug body can be fixed in the axial direction and in the radial direction.

[0030] In order to facilitate the transportation of the ignition bridge plug to the liquid high-energy material for ignition, the ignition bridge plug needs to be used in conjunction with the setting tool 100 .

[0031] A sealing tool butt end 12 is fixed to the top of the center tube 1. The sealing tool butt end 12 has a central flow channel, and the central flow channel of the sealing tool butt end 12 is connected to the central flow channel of the center tube 1. refer to Figure 2 , and combined with Figure 1 The inner wall of the upper part of the central flow channel of the butt end 12 of the sealing tool is configured with an internal thread 121, and a push rod 101 is arranged inside the sealing tool 100. The bottom end of the push rod 101 is configured with an external thread, and the bottom end of the push rod 101 is connected to the upper part of the central flow channel of the butt end 12 of the sealing tool through a thread.

[0032] The lower part of the sealing tool 100 is provided with a push tube 102. When the bottom end of the push rod 101 is threadedly connected with the upper part of the central flow channel of the sealing tool docking end 12, the push tube 102 at the lower part of the sealing tool 100 just abuts against and aligns with the top end of the bridge plug body.

[0033] The sealing tool 100 is provided with a cable connector, on which a cable is inserted. The sealing tool 100 is lowered by moving the cable, thereby transporting the ignition bridge plug to the liquid high-energy material.

[0034] Specifically, the setting tool is transported by a cable, and the bridge plug body of the ignition bridge plug is transported and set in the contact area between the liquid high-energy material and the fracturing fluid in the deflection section above the horizontal section.

[0035] In order to facilitate the removal of the setting tool and its cable, the inner wall below the internal thread 121 of the setting tool butt end 12 is provided with a weak point 122 that is easy to break.

[0036] Preferably, the setting tool butt end 12, the center tube 1 and the piston housing 11 are integrally formed, and the central flow channel of the setting tool butt end 12, the central flow channel of the center tube 1 and the cavity of the piston housing 11 are sequentially connected from top to bottom.

[0037] As a specific implementation, the piston 21 is temporarily restrained on the inner wall of the upper part of the cavity of the piston housing 11 by two shear pins 20 .

[0038] In order to prevent the high-energy and high-pressure gas from returning to the upper part of the wellbore 200 after the liquid high-energy material below the ignition bridge plug explodes, two protective barriers are designed.

[0039] Design of the first protective barrier: the inner diameter of the cavity of the piston housing 11 is larger than the inner diameter of the central flow channel of the center tube 1, and a step is provided at the junction of the cavity of the piston housing 11 and the central flow channel of the center tube 1 to prevent the piston 21 from entering the central flow channel of the center tube 1 from the cavity of the piston housing 11.

[0040] Design of the second protective barrier: A one-way valve 3 is provided at the connection between the butt end 12 of the sealing tool and the central flow channel of the central pipe 1, and the one-way valve 3 is used to only allow the medium to be transmitted from top to bottom, but not to allow the medium to be transmitted from bottom to top.

[0041] The second protective barrier can isolate the high-energy and high-pressure gas under the ignition bridge plug, thereby isolating the high-energy gas.

[0042] In order to facilitate drilling and removal, the bridge plug body and the ignition head 2 are made of easy-to-drill materials.

[0043] Example 2: A method for using an ignition bridge plug Embodiment 2 of the present invention provides a method for using an ignition bridge plug, using the ignition bridge plug of embodiment 1, and the method for using the ignition bridge plug comprises the following steps: Step 1: Rotate the push rod 101 of the setting tool 100 so that the bottom end of the push rod 101 of the setting tool 100 is threadedly connected to the upper part of the central flow channel of the setting tool docking end 12, until the push tube 102 at the bottom of the setting tool 100 is just against and aligned with the top of the bridge plug body, thus completing the docking of the setting tool and the ignition bridge plug; Step 2: The setting tool 100 is transported by cable to lower the ignition bridge plug into the wellbore 200 to a predetermined depth to ensure that the detonator 23 of the piston housing 11 of the ignition bridge plug is immersed in the liquid high-energy material in the wellbore, such as Figure 3 As shown; Step 3: The push tube 102 of the setting tool 100 moves downward, pushing the push ring 13; the push ring 13 pushes the upper cone 15 downward through the upper slip 14, and the upper cone 15 squeezes the rubber tube 16 downward, and the rubber tube 16 expands outward until it is tightly attached to the inner wall of the wellbore 200 and fixed, thereby achieving the setting of the bridge plug; Step 4: The tension between the push rod 101 of the setting tool 100 and the butt end 12 of the setting tool continues to increase until the easily broken weak point 122 of the butt end 12 of the setting tool breaks, and the setting tool 100 is pulled out by the cable; Step 5: Pressurize at the wellhead, and the pressurized medium passes through the central flow channel of the central tube 1 to impact the piston 21. When the piston 21 is impacted by the pressurized medium, it first cuts off the shear pin and then drives the firing pin 22 to move forward; the firing pin 22 moves forward until it hits the detonator 23; the detonator 23 generates sparks after being hit, and the sparks move forward to ignite.

[0044] Specifically, when the piston 21 is impacted by the pressurized medium, it immediately cuts off the shear pin and gets rid of the temporary restraint. Figure 4 shown.

[0045] Step 6: The detonator 23 is ignited to detonate the liquid high-energy material in the wellbore 200 and the hydraulic fracture, generating a large amount of high-energy gas to achieve reservoir transformation, such as Figure 5 shown.

[0046] Step 7: Drill out the ignition bridge plug by lowering the drilling tool to clear the horizontal well.

[0047] Among them, in step six, during the detonation after the detonator 23 is ignited, the step at the junction of the cavity of the piston shell 11 and the central flow channel of the central tube 1 always blocks the piston 21 from entering the central flow channel of the central tube 1 from the cavity of the piston shell 11, and the piston 21 is always constrained at the step, forming a first protective barrier; the one-way valve 3 always limits the transmission of the medium from bottom to top, forming a second protective barrier. The first protective barrier and the second protective barrier together isolate the high-pressure and high-energy gas generated after the explosion.

[0048] The two protective barriers can prevent the lower gas from passing upward through the ignition bridge plug, thereby isolating the high-pressure and high-energy gas in the wellbore and formation below the bridge plug. One is to ensure the safety of the upper wellbore and wellhead, and the other is to maximize the application of the high-energy gas energy of the explosion production capacity to the formation, thereby improving the reservoir transformation effect.

[0049] Specifically, the liquid energetic material is liquid explosive.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An ignition bridge plug, comprising a bridge plug body, wherein the bridge plug body comprises a center tube (1), characterized in that: The central tube (1) has a central flow channel, a piston housing (11) is fixed to the bottom end of the central tube, and the interior of the piston housing (11) is in communication with the central flow channel; An ignition head (2) is provided at the front end of the bridge plug body, and the ignition head (2) comprises a piston (21), a firing pin (22) and a detonator (23). The piston housing (11) comprises a cavity, and the piston (21) is temporarily restrained at the upper part of the cavity of the piston housing (11); The firing pin (22) is fixed to the lower part of the piston (21); The detonator (23) penetrates and is fixed to the bottom of the piston housing (11) and is directly opposite to the firing pin (22); The central flow channel of the central pipe (1) is provided with a one-way valve, which only allows pressure to be transmitted in one direction from top to bottom, and is used as a channel for the circulation of pressurized medium to impact the piston (21) and make it move forward, and at the same time serves as a barrier to isolate the wellbore pressure below the bridge plug; When the piston (21) is impacted by the pressurized medium, it first breaks free from the temporary restraint and then drives the firing pin (22) to move forward; the firing pin (22) moves forward until it strikes the detonator (23); after the detonator (23) is struck, sparks are generated, and the sparks move forward to ignite.

2. The ignition bridge plug according to claim 1, characterized in that: The bridge plug body further comprises a push ring (13), an upper slip (14), an upper cone (15), a rubber sleeve (16), a lower cone (17), a lower slip (18) and a fixing ring (19). The push ring (13) and the fixing ring (19) are respectively arranged at two ends of the central tube (1), and the push ring (13) can be slidably sleeved on the top end of the central tube (1), and the fixing ring (19) is fixed on the bottom end of the central tube (1); The rubber sleeve (16) is sleeved on the outer wall of the middle portion of the central tube (1); The upper cone (15) and the lower cone (17) are respectively arranged at two ends of the rubber cylinder (16); The upper slip (14) is arranged between the push ring (13) and the upper cone (15); The lower slip (18) is arranged between the lower cone (17) and the fixing ring (19).

3. The ignition bridge plug according to claim 1, characterized in that: Used in conjunction with the setting tool (100); A setting tool butt end (12) is fixed to the top end of the center tube (1), the setting tool butt end (12) has a central flow channel, and the central flow channel of the setting tool butt end (12) is connected to the central flow channel of the center tube (1); The inner wall of the upper part of the central flow channel of the setting tool butt end (12) is provided with an internal thread (121); a push rod (101) is provided inside the setting tool (100); the bottom end of the push rod (101) is provided with an external thread; the bottom end of the push rod (101) is connected to the upper part of the central flow channel of the setting tool butt end (12) via a thread; The lower part of the sealing tool (100) is provided with a push tube (102). When the bottom end of the push rod (101) is threadedly connected with the upper part of the central flow channel of the butt end (12) of the sealing tool, the push tube (102) at the lower part of the sealing tool (100) is just against and aligned with the top end of the bridge plug body.

4. The ignition bridge plug according to claim 3, characterized in that: An inner wall below the internal thread (121) of the setting tool butt end (12) is provided with a weak point (122) that is easy to break.

5. The ignition bridge plug according to claim 1, characterized in that: The piston (21) is temporarily restrained on the inner wall of the upper part of the cavity of the piston housing (11) by two shear pins (20).

6. The ignition bridge plug according to claim 1, characterized in that: The inner diameter of the cavity of the piston housing (11) is larger than the inner diameter of the central flow channel of the central tube (1), and a step is provided at the junction of the cavity of the piston housing (11) and the central flow channel of the central tube (1) to prevent the piston (21) from entering the central flow channel of the central tube (1) from the cavity of the piston housing (11).

7. The ignition bridge plug according to claim 1, characterized in that: A one-way valve (3) is provided at the connection between the butt end (12) of the sealing tool and the central flow channel of the central pipe (1), and the one-way valve (3) only allows the medium to be transmitted from top to bottom, but does not allow the medium to be transmitted from bottom to top.

8. The ignition bridge plug according to claim 1, characterized in that: The bridge plug body and the ignition head (2) are both made of easy-to-drill materials.

9. A method for using the ignition bridge plug according to any one of claims 1 to 8, characterized in that: include Step 1: rotating the push rod (101) of the setting tool (100) so that the bottom end of the push rod (101) of the setting tool (100) is connected to the upper part of the central flow channel of the docking end (12) of the setting tool through threads, until the push tube (102) at the bottom of the setting tool (100) is just against and aligned with the top end of the bridge plug body, thereby completing the docking of the setting tool and the ignition bridge plug; Step 2: transporting the setting tool (100) via a cable to lower the ignition bridge plug into the wellbore (200) to a predetermined depth, so as to ensure that the detonator (23) of the piston housing (11) of the ignition bridge plug is immersed in the liquid high-energy material in the wellbore; Step 3: The push tube (102) of the setting tool (100) moves downward, pushing the push ring (13); the push ring (13) pushes the upper cone (15) downward through the upper slip (14), and the upper cone (15) presses the rubber tube (16) downward, and the rubber tube (16) expands outward until it is tightly attached to the inner wall of the wellbore (200) and fixed, thereby achieving the setting of the bridge plug; Step 4: the tension between the push rod (101) of the setting tool (100) and the butt end (12) of the setting tool continues to increase until the easily broken weak point (122) of the butt end (12) of the setting tool breaks, and the setting tool (100) is pulled out by the cable; Step 5: Pressurizing at the wellhead, the pressurized medium passes through the central flow channel of the central tube (1) and impacts the piston (21). When the piston (21) is impacted by the pressurized medium, it first cuts off the shear pin and then drives the firing pin (22) to move forward. The firing pin (22) moves forward until it impacts the detonator (23). After the detonator (23) is impacted, sparks are generated, and the sparks move forward to ignite. Step 6: The detonator (23) ignites and detonates the liquid high-energy material in the wellbore (200) and the hydraulic fracture, generating a large amount of high-energy gas to achieve reservoir transformation; Step 7: Drill out the ignition bridge plug by lowering the drilling tool to clear the horizontal well.

10. The method for using the ignition bridge plug according to claim 9, characterized in that: In step six, during the detonation after the detonator (23) is ignited, the step at the junction of the cavity of the piston shell (11) and the central flow channel of the central tube (1) always blocks the piston (21) from entering the central flow channel of the central tube (1) from the cavity of the piston shell (11), and the piston (21) is always restrained at the step, forming a first protective barrier to seal the high-pressure and high-energy gas generated after the explosion; the one-way valve (3) always limits the transmission of the medium from bottom to top, forming a second protective barrier to seal the high-pressure and high-energy gas generated after the explosion.

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