A highly stable internally mounted secondary-enhancing composite perforation device for oil extraction.

Abstract

This invention belongs to the field of oil extraction equipment, specifically a highly stable internally mounted secondary-enhancing composite perforation device for oil extraction, including a perforator; a connecting rod is fixedly connected to the top of the perforator; a connecting sleeve is fixedly connected to the side wall of the perforator; a mating block is provided on the side wall of the connecting sleeve; through the connecting sleeve, when the perforator slides down into the well, it drives the connecting sleeve to slide to the corresponding hole reserved in the mating block, and the cavity of the connecting sleeve and the hole of the mating block form a channel. When the perforator is ejected, it passes through the channel to reduce resistance, penetrates the final external cementing ring, and is driven into the formation, increasing the length of the connecting channel, thereby increasing production and injection. In addition, the first elastic element compresses the arc-shaped magnetic block and locks it into the internal limit of the mating magnetic block, enhancing the stability of the corresponding connection of the connecting sleeve. At the same time, the needle is used to puncture the water storage bag to release foam, which achieves a sealing effect and enhances the stability of the connection.

Description

Technical Field

[0001] This invention belongs to the field of petroleum extraction equipment, specifically a highly stable internally mounted secondary enhancement composite perforation device for petroleum extraction. Background Technology

[0002] Composite perforation devices can generally be classified into integrated, jacketed, and under-mounted types, with integrated composite perforation devices being more commonly used in China at present.

[0003] A Chinese patent with publication number CN113236197A discloses an internally mounted secondary-enhanced composite perforation device, including a device body, a cartridge holder tube inside the device body, a medium-speed fracturing projectile, a barrier layer, a perforating projectile, a high-speed loaded fracturing projectile installed in the cartridge holder tube, and a gun head and a gun tail at both ends of the device body. The gun tail and the gun head are connected to the device body by threaded engagement. This patent enables the internally mounted secondary-enhanced composite perforation process to proceed normally and efficiently, ensuring the safe and stable use of the internally mounted secondary-enhanced composite perforation device.

[0004] When the internal secondary enhancement composite perforation device is run into the well, the perforation device will encounter some resistance when the perforation projectile penetrates the casing and cement sheath after reaching the predetermined layer, which will affect the length of the perforation channel and reduce the amount of oil produced.

[0005] Therefore, the present invention provides an internally mounted secondary enhancement composite perforation device with high stability for oil extraction. Summary of the Invention

[0006] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0007] The technical solution adopted by this invention to solve its technical problem is as follows: A highly stable internally mounted secondary-enhancing composite perforating device for oil extraction, comprising a perforator; a connecting rod fixedly connected to the top of the perforator; a connecting sleeve fixedly connected to the side wall of the perforator; a mating block provided on the side wall of the connecting sleeve; a casing fixedly connected to the side wall of the mating block; and an external cementing ring fixedly connected to the side wall of the casing. First, the connecting sleeve is fixedly inserted into the well and driven into the well. Then, the external cementing ring is cast. Next, the internally mounted secondary-enhancing composite perforator is lowered into the well to the corresponding position of the mating block. The hole in the connecting sleeve is aligned with the pre-reserved hole in the mating block, and the perforation is then performed. The perforating projectile, fired from the perforator, passes through the cavity inside the connecting sleeve and through the pre-reserved holes in the mating block, penetrating the thinner external cement ring and entering the formation. Due to the reduced resistance, the length of the connecting channel is increased, thereby increasing production and injection. At the same time, the internal secondary efficiency-enhancing perforation technology effectively combines the split and integrated composite perforators through reasonable structural design. After the perforating projectile is detonated, the formation is rapidly loaded for the first time, forming a network of fractures around the wellbore. Before the fractures are completely closed, the gunpowder begins to burn, and a large amount of fracturing gas loads the fractures a second time, extending the fracture length and increasing the fracture length and conductivity.

[0008] Preferably, the inner wall of the connecting sleeve is slidably connected to multiple sets of arc-shaped magnetic blocks; the side wall of each arc-shaped magnetic block is fixedly connected to a first elastic element; the mating block is internally provided with a magnetic attraction component, which is used to limit the arc-shaped magnetic blocks; the first elastic element fixedly connected to the inner wall of the connecting sleeve is used to squeeze the arc-shaped magnetic blocks, and when the shaft is lowered, the arc-shaped magnetic blocks are squeezed and pressed against the side wall of the mating block for friction. When the arc-shaped magnetic blocks slide to the position of the magnetic attraction component at the mating block, they cooperate with the magnetic attraction component to limit the arc-shaped magnetic blocks, which plays a role in assisting the alignment of the connecting sleeve. At the same time, the arc-shaped head of the arc-shaped magnetic blocks can be easily moved without getting stuck when the perforator is raised and lowered.

[0009] Preferably, the magnetic attraction assembly includes a mating magnetic block; the mating magnetic block is fixed inside the mating block; the arc-shaped magnetic block and the mating magnetic block can attract each other when they are close to each other; the mating magnetic block has an arc-shaped groove inside, which corresponds to the shape of the arc-shaped magnetic block; when close to the mating magnetic block, the interior of the mating magnetic block attracts the arc-shaped magnetic block to move closer together, and the arc-shaped magnetic block slides into the corresponding arc-shaped groove inside the mating magnetic block, which plays an auxiliary limiting role and improves the stability of the connection when the ejection hole is being ejected.

[0010] Preferably, the arc-shaped magnetic block has a storage groove inside; a water storage bag is fixedly connected inside the arc-shaped magnetic block; a second elastic element is fixedly connected to the inner side wall of the mating magnetic block; a sliding plate is fixedly connected to the side wall of the second elastic element, and the sliding plate is slidably connected to the inner side wall of the mating magnetic block; a needle is fixedly connected to the side wall of the sliding plate, and the needle is located at the side of the water storage bag; when the arc-shaped magnetic block is inserted into the interior of the mating magnetic block, the second elastic element will squeeze the sliding plate to slide, the needle will extend forward and penetrate the interior of the arc-shaped magnetic block, and the tip of the needle will pierce the interior of the water storage bag. The interior of the water storage bag is filled with foam, and after the foam flows out, it will adhere and seal the arc-shaped magnetic block and the mating magnetic block, thereby enhancing the tightness of the connection between the arc-shaped magnetic block and the mating magnetic block.

[0011] Preferably, a protective sleeve is slidably connected to the side wall of the needle; a baffle is fixedly connected to the side wall of the arc magnetic block and located at the opening of the arc magnetic block; the protective sleeve protects the tip of the needle, and a spring is connected to the protective sleeve and the needle for the protective sleeve to return to its original position and wrap around the needle. When the arc magnetic block drives the baffle to press against the side wall of the protective sleeve, if the sliding speed of the perforator is too fast, the arc magnetic block will slide directly past the needle and the water storage bag will not be punctured. If the speed is slower, the arc magnetic block will be inserted into the corresponding hole, and the needle will be pressed and slid by the second elastic element and puncture the water storage bag, thus preventing the internal water storage bag from being punctured when the arc magnetic block does not correspond to the hole.

[0012] Preferably, a sliding rod is fixedly connected to the side wall of the arc-shaped magnetic block; a pressing block is fixedly connected to the side wall of the sliding rod; the pressing block is trapezoidal and sloping; a metal plate is provided on the side wall of the pressing block; a sealing plate is slidably connected to the inner side wall of the connecting sleeve; a square magnetic block is fixedly connected inside the sealing plate; this reduces the accumulation of impurities at the perforation hole of the perforator and reduces the resistance of the perforating spring. When the arc-shaped magnetic block is inserted into the mating magnetic block, the arc-shaped magnetic block drives the pressing block on the sliding rod to slide, and the sloping side wall of the pressing block presses the metal plate to slide upward. After the metal plate moves away from the square magnetic block, the sealing plate slides down, opening the cavity of the connecting sleeve, thus playing the role of an adaptive switch.

[0013] Preferably, an elastic pull rope is fixed to the inner wall of the connecting sleeve; one end of the elastic pull rope is fixed to the bottom end of the sealing plate; the metal plate and the sealing plate seal the cavity of the connecting sleeve. When the arc magnetic block is inserted into the interior of the mating magnetic block, the metal plate is squeezed upward by the squeezing block, and the elastic pull rope quickly pulls the sealing plate down, which plays the role of quickly driving the sealing plate to reset.

[0014] Preferably, a guide block is slidably connected to the inner wall of the mating block; one side of the guide block is conical, and an arc-shaped groove is opened on the other side near the arc magnetic block; two sets of steel plates are fixed inside the mating block and located on both sides of the guide block; by placing the guide block in the channel inside the mating block, the perforation is ejected in the arc-shaped groove on the side wall of the guide block, driving the guide block to slide forward, and relying on the conical angle of the guide block, it plays the role of guiding the opening, quickly driving the mating block and the external cement ring through and into the formation, while the two sets of steel plates are used to support the channel of the mating block to prevent the mating block from cracking and the residue from falling due to the perforation.

[0015] Preferably, a filter screen plate is slidably connected inside the mating block; a limiting plate is fixedly connected to the bottom end of the mating block and is located at the bottom end of the filter screen plate; since impurities are prone to fall into the channel and slowly flow back into the casing as oil is extracted, causing blockage, the limiting plate is broken when the perforation ejection hole is used, and the filter screen plate falls with gravity and gets stuck in the internal hole of the mating block, thereby filtering impurities in the oil.

[0016] Preferably, a cardboard is fixed to the side wall of the arc-shaped magnetic block; the cardboard is located between the water storage bag and the baffle; the cardboard first blocks the needle, and when the arc-shaped magnetic block is inserted for a long time at the mating magnetic block, the needle will puncture the water storage bag, thus protecting the water storage bag. When the lowered tip does not insert the arc-shaped magnetic block into the corresponding hole, the excessive squeezing force will cause the needle to directly puncture the water storage bag. At the same time, the pushing will generate deformation and squeeze, thereby improving the squeezing penetration force of the needle.

[0017] The beneficial effects of this invention are as follows:

[0018] 1. The present invention describes a highly stable internally mounted secondary enhancement composite perforation device for oil extraction. Through a connecting sleeve, when the perforator slides down into the well, it drives the connecting sleeve to slide to the corresponding hole pre-reserved in the mating block. The cavity of the connecting sleeve and the hole in the mating block form a channel. When the perforator is ejected, it passes through the channel to reduce resistance, penetrates the final external cement ring, and is driven into the formation, increasing the length of the connecting channel and thus increasing production and injection. Furthermore, in conjunction with the first elastic element, it compresses the arc-shaped magnetic block, locking it into the internal limit of the mating magnetic block, enhancing the stability of the corresponding connection of the connecting sleeve. Simultaneously, a needle is used to puncture the water storage bag, releasing foam adhesive, achieving a sealing effect and further enhancing the stability of the connection.

[0019] 2. The oil extraction device of the present invention is a highly stable internally mounted secondary enhancement composite perforation device. Through the magnetic attraction between the set metal plate and the square magnetic block, the metal plate and the sealing plate seal the cavity of the connecting sleeve, reducing the amount of impurities blocking the perforation point of the perforator. When the arc magnetic block is inserted into the interior of the mating magnetic block, the squeezing block squeezes the metal plate to slide down, and the elastic pull rope pulls the sealing plate to reset, which plays the role of adaptive opening and closing of the cavity, reducing the resistance of the perforation ejection. Furthermore, the conical head of the guide block guides the perforation ejection to facilitate the rapid penetration of the perforation ejection into the formation. Finally, the filter plate falls to filter the oil in the connecting channel, reducing the amount of impurities entering the casing. Attached Figure Description

[0020] The invention will now be further described with reference to the accompanying drawings.

[0021] Figure 1 This is a three-dimensional structural view of the perforator in this invention;

[0022] Figure 2 This is a structural cross-sectional view of the present invention;

[0023] Figure 3 yes Figure 2 Enlarged view of point A;

[0024] Figure 4 yes Figure 3 Enlarged view of point B;

[0025] Figure 5 This is a partial structural schematic diagram of the arc magnetic block in this invention.

[0026] In the diagram: 1. Perforator; 11. Connecting rod; 12. Connecting sleeve; 13. Mating block; 14. Sleeve; 15. External cement ring; 2. Arc magnetic block; 21. Elastic component No. 1; 3. Mating magnetic block; 4. Water storage bag; 41. Elastic component No. 2; 42. Sliding plate; 43. Needle; 5. Protective sleeve; 51. Baffle; 6. Sliding rod; 61. Extrusion block; 62. Metal plate; 63. Sealing plate; 64. Square magnetic block; 7. Elastic pull rope; 8. Guide block; 81. Steel plate; 9. Filter screen plate; 91. Limiting plate; 92. Cardboard. Detailed Implementation

[0027] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0028] Example 1

[0029] like Figure 1As shown in the embodiment of the present invention, an internally mounted secondary-enhancing composite perforation device for oil extraction with high stability includes a perforator 1; a connecting rod 11 is fixedly connected to the top of the perforator 1; a connecting sleeve 12 is fixedly connected to the side wall of the perforator 1; a mating block 13 is provided on the side wall of the connecting sleeve 12; a casing 14 is fixedly connected to the side wall of the mating block 13; and an external cementing ring 15 is fixedly connected to the side wall of the casing 14. When the internally mounted secondary-enhancing composite perforator 1 is lowered into the well, after the perforator 1 reaches the predetermined layer, the perforating bullet needs to penetrate the casing 14 and the external cementing ring 15, but it will encounter some resistance, affecting the length of the perforated connecting channel and reducing the oil extraction volume. Therefore, the connecting sleeve 12 is first fixed to the side wall of the casing 14 and lowered into the well, and then the external cementing ring 15 is cast out, followed by the internal... The internally mounted secondary enhancement composite perforator 1 is lowered into the well to the corresponding position of the mating block 13. The hole of the connecting sleeve 12 is aligned with the reserved hole of the mating block 13. The perforating projectile is fired from the perforator 1, passes through the cavity inside the connecting sleeve 12, and through the reserved hole of the mating block 13, penetrates the thin external cementing annulus 15 and enters the formation. Due to the reduction of resistance, the length of the connecting channel is increased, which plays a role in increasing production and injection. At the same time, the internally mounted secondary enhancement perforation technology effectively combines the split and integrated composite perforator 1 through reasonable structural design. After the perforating projectile is detonated, the formation is rapidly loaded for the first time, forming a network of fractures around the wellbore. Before the fractures are completely closed, the gunpowder begins to burn, and a large amount of fracturing gas loads the fractures for the second time, which extends the fracture length and increases the fracture length and conductivity.

[0030] like Figures 2 to 3 As shown, multiple sets of arc-shaped magnetic blocks 2 are slidably connected to the inner wall of the connecting sleeve 12; a first elastic element 21 is fixedly connected to the side wall of the arc-shaped magnetic block 2; a magnetic suction assembly is provided inside the mating block 13, which is used to limit the arc-shaped magnetic block 2; when the perforator 1 is inserted into the well, since the holes reserved in the connecting sleeve 12 and the mating block 13 are not easy to align, the first elastic element 21 fixed to the inner wall of the connecting sleeve 12 is used to squeeze the arc-shaped magnetic block 2. When going down into the well, the arc-shaped magnetic block 2 is squeezed and pressed against the side wall of the mating block 13 for friction. When the arc-shaped magnetic block 2 slides to the position of the magnetic suction assembly at the mating block 13, it cooperates with the magnetic suction assembly to limit the arc-shaped magnetic block 2, which plays a role in assisting the alignment of the connecting sleeve 12. At the same time, the arc-shaped head of the arc-shaped magnetic block 2 can be easily moved without getting stuck when the perforator 1 is raised and lowered.

[0031] like Figures 2 to 4As shown, the magnetic attraction assembly includes a mating magnetic block 3; the mating magnetic block 3 is fixed inside the mating block 13; the arc-shaped magnetic block 2 and the mating magnetic block 3 can attract each other when they are close to each other; the mating magnetic block 3 has an arc-shaped groove inside, which corresponds to the shape of the arc-shaped magnetic block 2; when the arc-shaped magnetic block 2 slides down the inner wall of the mating block 13 and approaches the position of the mating magnetic block 3, the interior of the mating magnetic block 3 attracts the arc-shaped magnetic block 2 to move closer to each other, and the arc-shaped magnetic block 2 slides into the corresponding arc-shaped groove inside the mating magnetic block 3, which plays an auxiliary limiting role and improves the stability of the connection when the ejection hole is ejected.

[0032] The arc-shaped magnetic block 2 has a storage slot inside; a water storage bag 4 is fixedly connected inside the arc-shaped magnetic block 2; a second elastic element 41 is fixedly connected to the inner side wall of the mating magnetic block 3; a sliding plate 42 is fixedly connected to the side wall of the second elastic element 41, and the sliding plate 42 is slidably connected to the inner side wall of the mating magnetic block 3; a needle 43 is fixedly connected to the side wall of the sliding plate 42, and the needle 43 is located on the side of the water storage bag 4; when the perforation bullet fires, due to the great power of the perforation bullet, the arc-shaped magnetic block 2... The connection between the magnetic block 2 and the mating magnetic block 3 is slightly weaker. Therefore, when the arc magnetic block 2 is inserted into the interior of the mating magnetic block 3, the second elastic element 41 will squeeze the sliding plate 42 to slide. The needle 43 extends forward and passes through the interior of the arc magnetic block 2. The tip of the needle 43 pierces the interior of the water storage bag 4 and punctures it. The interior of the water storage bag 4 is filled with foam. After the foam flows out, it adheres and seals the arc magnetic block 2 and the mating magnetic block 3, enhancing the tightness of the connection between the arc magnetic block 2 and the mating magnetic block 3.

[0033] A protective sleeve 5 is slidably connected to the side wall of the needle 43; a baffle 51 is fixedly connected to the side wall of the arc magnetic block 2 and is located at the opening of the arc magnetic block 2; since multiple sets of arc magnetic blocks 2 are slidably connected to the inner side wall of the connecting sleeve 12, in order to prevent the water storage bag 4 from being punctured when the arc magnetic block 2 slides to the mating magnetic block 3 without a corresponding hole, the protective sleeve 5 is used to protect the tip of the needle 43. A spring is connected between the protective sleeve 5 and the needle 43 for... When the protective sleeve 5 is reset and wrapped around the needle 43, if the arc magnetic block 2 drives the baffle 51 to squeeze the side wall of the protective sleeve 5, and the sliding speed of the perforator 1 is too fast, the arc magnetic block 2 will slide directly past the needle 43 and the water storage bag 4 will not be punctured. If the speed is slower, the arc magnetic block 2 will be inserted into the corresponding hole, and the needle 43 will be squeezed and slid by the second elastic element 41 and puncture the water storage bag 4, thus avoiding the internal water storage bag 4 from being punctured when the arc magnetic block 2 does not correspond to the hole.

[0034] like Figures 2 to 3As shown, a sliding rod 6 is fixedly connected to the side wall of the arc-shaped magnetic block 2; a pressing block 61 is fixedly connected to the side wall of the sliding rod 6; the pressing block 61 is trapezoidal and sloped; a metal plate 62 is provided on the side wall of the pressing block 61; a sealing plate 63 is slidably connected to the inner side wall of the connecting sleeve 12; a square magnetic block 64 is fixedly connected inside the sealing plate 63; when the arc-shaped magnetic block 2 is pressed against the inner side wall of the mating block 13 and the sleeve 14 and slides, the metal plate 62 and the square magnetic block 64 approach and attract each other. The metal plate 62 and the sealing plate 63 are joined together to seal the cavity of the connecting sleeve 12, reducing the accumulation of impurities at the perforation hole of the perforator 1 and reducing the resistance of the perforating spring. When the arc magnetic block 2 is inserted into the mating magnetic block 3, the arc magnetic block 2 drives the pressing block 61 on the sliding rod 6 to slide. The sloping side wall of the pressing block 61 presses the metal plate 62 to slide upward. After the metal plate 62 moves away from the square magnetic block 64, the sealing plate 63 slides down and opens the cavity of the connecting sleeve 12, which plays the role of an adaptive switch.

[0035] An elastic pull rope 7 is fixed to the inner wall of the connecting sleeve 12; one end of the elastic pull rope 7 is fixed to the bottom end of the sealing plate 63; when the square magnetic block 64 attracts the metal plate 62, the metal plate 62 cooperates with the sealing plate 63 to seal the cavity of the connecting sleeve 12; when the arc magnetic block 2 is inserted into the interior of the cooperating magnetic block 3, the metal plate 62 is squeezed upward by the squeezing block 61 and slides upward, and the elastic pull rope 7 quickly pulls the sealing plate 63 downward, which plays the role of quickly driving the sealing plate 63 to reset.

[0036] The inner wall of the mating block 13 is slidably connected to a guide block 8; one side of the guide block 8 is conical, and the other side near the arc magnetic block 2 has an arc groove; two sets of steel plates 81 are fixed inside the mating block 13 and located on both sides of the guide block 8; in order to reduce the opening resistance of the perforating projectile, the guide block 8 is placed in the channel inside the mating block 13, and the perforating projectile is launched into the arc groove on the side wall of the guide block 8, which drives the guide block 8 to slide forward, and relies on the conical angle of the guide block 8 to guide the opening, quickly driving the mating block 13 and the external cement ring 15 through and into the formation. At the same time, the two sets of steel plates 81 are used to support the channel of the mating block 13 to prevent the mating block 13 from cracking and the debris falling off due to the perforating projectile.

[0037] A filter plate 9 is slidably connected inside the mating block 13; a limiting plate 91 is fixedly connected to the bottom end of the mating block 13 and is located at the bottom end of the filter plate 9; when the perforation ejects out of the connecting channel, impurities are prone to fall into the channel and slowly flow back into the casing 14 with the extraction of oil, causing blockage. Therefore, when the perforation ejects out of the channel, the limiting plate 91 is broken, and the filter plate 9 falls with gravity and gets stuck in the internal hole of the mating block 13, which plays the role of filtering impurities in the oil.

[0038] Example 2

[0039] like Figure 5 As shown in the comparative embodiment one, another embodiment of the present invention is as follows: a cardboard 92 is fixed to the side wall of the arc magnetic block 2; the cardboard 92 is located between the water storage bag 4 and the baffle 51; when the arc magnetic block 2 slides into the interior of the mating magnetic block 3, since the needle 43 is relatively sharp, it is easy to puncture the water storage bag 4 when the arc magnetic block 2 does not have a corresponding hole, so the cardboard 92 is fixed at the opening of the arc magnetic block 2. The cardboard 92 first blocks the needle 43. When the arc magnetic block 2 is inserted into the mating magnetic block 3 for a long time, the needle 43 will puncture the water storage bag 4, which plays a role in protecting the water storage bag 4 and reducing the excessive squeezing force of the needle 43 when the arc magnetic block 2 is not inserted into the corresponding hole, so that the needle 43 directly punctures the water storage bag. At the same time, the needle 43 pushes the 92 to deform and squeeze the 4, thereby improving the squeezing penetration force of the needle 43.

[0040] Working principle: When the internally mounted secondary enhancement composite perforator 1 is lowered into the well, after the perforator 1 reaches the predetermined layer, the perforating projectile needs to penetrate the casing 14 and the external cement sheath 15. However, it will encounter some resistance, affecting the length of the perforated connecting channel and reducing the oil production. Therefore, the connecting sleeve 12 is first fixed to the side wall of the casing 14 and lowered into the well. Then, the external cement sheath 15 is cast. After that, the internally mounted secondary enhancement composite perforator 1 is lowered into the well to the corresponding position of the mating block 13. The hole of the connecting sleeve 12 is aligned with the hole reserved in the mating block 13. The perforating projectile fired from the perforator 1 passes through the cavity inside the connecting sleeve 12 and through the hole reserved in the mating block 13. The perforator penetrates the thinner external cement sheath 15 into the formation. Due to the reduced resistance, the length of the connecting channel increases, thereby increasing production and injection. Simultaneously, the internal secondary enhancement perforation technology, through a rational structural design, effectively combines the separate and integrated composite perforator 1. First, the perforating projectile detonates, rapidly loading the formation and forming a network of fractures around the wellbore. Before the fractures completely close, the propellant begins to burn, and a large amount of fracturing gas applies a second load to the fractures, extending their length and increasing their conductivity. When the perforator 1 penetrates deeper into the well, the pre-reserved holes in the connecting sleeve 12 and the mating block 13 make it difficult to... For alignment, the first elastic element 21, fixed to the inner wall of the connecting sleeve 12, is used to compress the arc-shaped magnetic block 2. During the descent, the arc-shaped magnetic block 2 is compressed and rubbed against the side wall of the mating block 13. When the arc-shaped magnetic block 2 slides to the position of the magnetic attraction component at the mating block 13, it cooperates with the magnetic attraction component to limit the arc-shaped magnetic block 2, thus assisting in the alignment of the connecting sleeve 12. At the same time, the arc-shaped head of the arc-shaped magnetic block 2 facilitates movement and prevents jamming during the raising and lowering of the perforator 1. When the arc-shaped magnetic block 2 slides down the inner wall of the mating block 13 and approaches the position of the mating magnetic block 3, the interior of the mating magnetic block 3 attracts the arc-shaped magnetic block 2, causing them to slide into the interior of the mating magnetic block 3. The corresponding arc groove serves as an auxiliary limit, improving the stability of the connection when the ejector is ejected. When the ejector is ejected, due to the great power of the ejector, the connection between the arc magnetic block 2 and the mating magnetic block 3 is slightly weaker. Therefore, when the arc magnetic block 2 is inserted into the interior of the mating magnetic block 3, the second elastic element 41 will squeeze the sliding plate 42 to slide, and the needle 43 will extend forward and penetrate the interior of the arc magnetic block 2. The tip of the needle 43 will pierce the interior of the water storage bag 4. The water storage bag 4 is filled with foam. After the foam flows out, it will adhere and seal the arc magnetic block 2 and the mating magnetic block 3, enhancing the tightness of the connection between the arc magnetic block 2 and the mating magnetic block 3.Because multiple sets of arc-shaped magnetic blocks 2 are slidably connected to the inner wall of the connecting sleeve 12, in order to prevent the water storage bag 4 from being punctured when the arc-shaped magnetic blocks 2 slide to the mating magnetic block 3 without corresponding holes, a protective sleeve 5 is used to protect the tip of the needle 43. A spring is connected between the protective sleeve 5 and the needle 43 for the protective sleeve 5 to return to its original position and wrap around the needle 43. When the arc-shaped magnetic blocks 2 drive the baffle 51 to squeeze the side wall of the protective sleeve 5, if the sliding speed of the perforator 1 is too fast, the arc-shaped magnetic blocks 2 will slide directly past the needle 43, and the water storage bag 4 will not be punctured. If the speed is slower, the arc-shaped magnetic blocks 2 will be inserted into the corresponding holes, and the needle 43 will be punctured by the second elastic element. 41. Squeeze and slide, and puncture the water storage bag 4 to prevent the internal water storage bag 4 from being punctured when the arc magnetic block 2 does not correspond to the hole; when the arc magnetic block 2 slides against the inner wall of the mating block 13 and the sleeve 14, the metal plate 62 and the square magnetic block 64 approach and attract each other, and the metal plate 62 and the sealing plate 63 are joined together to seal the cavity of the connecting sleeve 12, reducing the accumulation of impurities at the perforation hole of the perforator 1 and reducing the resistance of the perforation bullet. When the arc magnetic block 2 is inserted into the mating magnetic block 3, the arc magnetic block 2 drives the squeezing block 61 on the sliding rod 6 to slide, and uses the sloping side wall of the squeezing block 61 to squeeze the metal plate 62 to slide upward. After moving away from the square magnetic block 64, the sealing plate 63 slides down, opening the cavity of the connecting sleeve 12 and acting as an adaptive switch. When the square magnetic block 64 attracts the metal plate 62, the metal plate 62, in conjunction with the sealing plate 63, seals the cavity of the connecting sleeve 12. When the arc magnetic block 2 is inserted into the interior of the mating magnetic block 3, the metal plate 62 is pressed upward by the pressing block 61, and the elastic pull rope 7 quickly pulls the sealing plate 63 down, thus quickly resetting the sealing plate 63. To reduce the opening resistance of the perforating bullet, a guide block 8 is placed in the channel inside the mating block 13, and the perforating bullet is ejected into the arc-shaped groove on the side wall of the guide block 8. The guide block 8 slides forward and, relying on the conical angle of the guide block 8, guides the opening, quickly driving the mating block 13 and the external cement ring 15 through into the formation. At the same time, two sets of steel plates 81 support the passage of the mating block 13 to prevent the mating block 13 from cracking and falling off due to the perforation projectile. When the perforation projectile is fired out of the connecting channel, impurities are prone to fall into the channel and slowly flow back into the casing 14 with the oil extraction, causing blockage. Therefore, when the perforation projectile is fired, the limiting plate 91 is broken, and the filter plate 9 falls with gravity and gets stuck in the internal hole of the mating block 13, which plays the role of filtering impurities in the oil.Because the needle 43 is quite sharp, it could easily puncture the water storage bag 4 when the arc-shaped magnetic block 2 is not in the corresponding hole. Therefore, cardboard 92 is fixed at the opening of the arc-shaped magnetic block 2. Cardboard 92 first blocks the needle 43. When the arc-shaped magnetic block 2 is inserted for a longer period at the mating magnetic block 3, the needle 43 will puncture the water storage bag 4, thus protecting the water storage bag 4. This reduces the pressure on the needle 43 when it is not in the corresponding hole, preventing it from directly puncturing the water storage bag. At the same time, the needle 43 pushes 92 to deform and squeeze the water storage bag 4, thereby improving the squeezing and penetrating power of the needle 43.

[0041] The terms "front," "back," "left," "right," "top," and "bottom" all refer to the figures in the accompanying drawings. Figure 1 Based on the perspective of the observer, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0042] In the description of this invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and 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. Therefore, they should not be construed as limiting the scope of protection of this invention.

[0043] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A highly stable internally mounted secondary-enhancing composite perforation device for oil extraction, characterized in that: Includes a perforator (1); a connecting rod (11) is fixedly connected to the top of the perforator (1); a connecting sleeve (12) is fixedly connected to the side wall of the perforator (1); a mating block (13) is provided on the side wall of the connecting sleeve (12); a sleeve (14) is fixedly connected to the side wall of the mating block (13); and an external cement injection sleeve (15) is fixedly connected to the side wall of the sleeve (14). The inner wall of the connecting sleeve (12) is slidably connected to multiple sets of arc magnetic blocks (2); the side wall of the arc magnetic block (2) is fixedly connected to an elastic element (21); the interior of the mating block (13) is provided with a magnetic attraction component, which is used to limit the arc magnetic block (2); The magnetic attraction assembly includes a mating magnetic block (3); the mating magnetic block (3) is fixed inside the mating block (13); the arc magnetic block (2) and the mating magnetic block (3) can attract each other when they are close to each other; the mating magnetic block (3) has an arc groove inside, which corresponds to the shape of the arc magnetic block (2); First, fix the mating block (13) on the side wall of the casing (14) and extend it down into the well. Then, pour out the external cement sleeve (15). Lower the internal secondary enhancement composite perforator (1) to the corresponding position of the mating block (13). Align the hole of the connecting sleeve (12) with the hole reserved in the mating block (13). The perforating bullet is fired from the perforator (1) through the cavity inside the connecting sleeve (12) and through the hole reserved in the mating block (13) to penetrate the thinner external cement sleeve (15) and enter the formation. First, the perforating shell is detonated to rapidly load the formation for the first time, forming a network of fractures around the wellbore. Before the fractures are completely closed, the gunpowder begins to burn, and a large amount of fracturing gas loads the fractures a second time, allowing the fracture length to be extended. The arc magnetic block (2) has a storage slot inside; a water storage bag (4) is fixed inside the arc magnetic block (2); a second elastic element (41) is fixed to the inner side wall of the mating magnetic block (3); a sliding plate (42) is fixed to the side wall of the second elastic element (41), and the sliding plate (42) is slidably connected to the inner side wall of the mating magnetic block (3); a needle (43) is fixed to the side wall of the sliding plate (42), and the needle (43) is located on the side of the water storage bag (4); The side wall of the needle (43) is slidably connected to a protective sleeve (5); the side wall of the arc magnetic block (2) is fixedly connected to a baffle (51) and located at the opening of the arc magnetic block (2); A sliding rod (6) is fixedly connected to the side wall of the arc magnetic block (2); a pressing block (61) is fixedly connected to the side wall of the sliding rod (6); the pressing block (61) is in the shape of a trapezoidal slope; a metal plate (62) is provided on the side wall of the pressing block (61); a sealing plate (63) is slidably connected to the inner side wall of the connecting sleeve (12); a square magnetic block (64) is fixedly connected inside the sealing plate (63).

2. The internally mounted secondary enhancement composite perforation device for oil extraction with high stability according to claim 1, characterized in that: An elastic pull rope (7) is fixed to the inner wall of the connecting sleeve (12); one end of the elastic pull rope (7) is fixed to the bottom end of the sealing plate (63).

3. The internally mounted secondary enhancement composite perforation device for oil extraction with high stability according to claim 2, characterized in that: The inner wall of the mating block (13) is slidably connected to a guide block (8); one side of the guide block (8) is conical, and the other side near the arc magnetic block (2) has an arc groove; two sets of steel plates (81) are fixed inside the mating block (13) and are located on both sides of the guide block (8).

4. The internally mounted secondary enhancement composite perforation device for oil extraction with high stability according to claim 3, characterized in that: The mating block (13) is internally slidably connected to a filter plate (9); the bottom end of the mating block (13) is fixedly connected to a limiting plate (91) and is located at the bottom end of the filter plate (9).

5. The internally mounted secondary enhancement composite perforation device for oil extraction with high stability according to claim 4, characterized in that: The side wall of the arc magnetic block (2) is fixed with a cardboard (92); the cardboard (92) is located between the water storage bag (4) and the baffle (51).

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