Metal double-slip soluble bridge plug

Abstract

The utility model discloses a metal double-slip soluble bridge plug which comprises a body made of soluble metal, the body comprises a setting ring, a mandrel, an upper slip, a cone, a lower slip and a guiding shoe, the setting ring, the upper slip, the cone and the lower slip are sequentially arranged on the mandrel in a sleeved mode in the axial direction of the mandrel, and the guiding shoe is connected to the end, away from the cone, of the lower slip. A sealing spherical surface is formed on the inner wall of one end of the mandrel, an elastic ratchet part is arranged at the other end of the mandrel, and a ratchet structure matched with the elastic ratchet part is arranged on the inner wall of the cone. When the metal double-slip soluble bridge plug is set, the elastic ratchet part and the ratchet part of the cone are mutually locked, and the stability of the structure of the metal double-slip soluble bridge plug is enhanced. The body of the metal double-slip soluble bridge plug is made of soluble materials, the dissolving time is short, the dissolving effect is good, and the situation that a production pipeline is blocked due to the fact that components of the metal double-slip soluble bridge plug are not completely dissolved is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of oil and gas mining equipment, in particular to a metal double-slip soluble bridge plug. Background Art

[0002] In oil and gas well stimulation operations, the widely used multi-bridge plug cluster perforation linkage is one of the common processes for achieving horizontal well fracturing. Soluble bridge plug fracturing has the characteristics of high efficiency, safety and lower construction cost. The existing types of soluble bridge plugs include single-slip soluble bridge plugs and double-slip soluble bridge plugs.

[0003] The single-slip soluble bridge plug has the advantages of large flow area, simple structure and low manufacturing cost, but it has the limitation of unstable setting. During the pressure fracturing operation of oil and gas wells, due to the influence of pressure fluctuations, vibration of the release hand, etc., the cone will be squeezed upward by the slip and the bottom hole pressure, which can easily loosen the cone and cause the slip to fall, resulting in the failure of the single-slip soluble bridge plug setting and affecting subsequent operations.

[0004] The double-slip soluble bridge plug has the advantages of stable sealing and resistance to high temperature and high pressure. However, the existing double-slip soluble bridge plug has problems such as too many parts, complex structure and poor sealing performance of the rubber cartridge. In addition, the dissolution effect of the rubber cartridge in the well environment is not ideal, and large pieces of undissolved rubber cartridge are left during operation, affecting the normal operation of the production pipeline and even posing the risk of damaging production equipment. Utility Model Content

[0005] In view of the shortcomings of the prior art, a metal double-slip soluble bridge plug is provided.

[0006] To achieve the above-mentioned purpose, the utility model provides a metal double-slip soluble bridge plug, including a body made of soluble metal, the body including a sealing ring, a core shaft, an upper slip, a cone, a lower slip and a guide shoe, the sealing ring, the upper slip, the cone and the lower slip are sequentially sleeved on the core shaft along the axial direction of the core shaft, the guide shoe is connected to the end of the lower slip away from the cone, the inner wall of one end of the core shaft forms a sealing spherical surface, the other end of the core shaft is provided with an elastic ratchet portion, and the inner wall of the cone is provided with a ratchet structure cooperating with the elastic ratchet portion.

[0007] According to one embodiment of the utility model, the outer side of one end of the cone close to the upper cava is cut inward to form an upper conical surface, and the inner wall of the upper cava is provided with a first conical surface matching with the upper conical surface. The outer side of one end of the cone close to the lower cava is cut inward to form a lower conical surface, and the inner wall of the lower cava is provided with a second conical surface matching with the lower conical surface.

[0008] According to one embodiment of the utility model, it also includes a soluble sealing ring, which is arranged on the lower conical surface and has a spiral structure.

[0009] According to one embodiment of the utility model, a plurality of first clutch platforms are arranged at intervals at one end of the sealing ring close to the upper cava, a first clutch groove is provided between two adjacent first clutch platforms, a plurality of second clutch platforms are arranged at intervals at one end of the upper cava close to the sealing ring, a second clutch groove is provided between two second clutch platforms, and when the sealing ring is connected to the upper cava, a second clutch platform is buckled in each first clutch groove, and a first clutch platform is buckled in each second clutch groove.

[0010] According to one embodiment of the utility model, the main body further comprises a clamping ring, an outer wall ring of one end of the upper slip close to the cone is provided with a matching groove, and the clamping ring is arranged in the matching groove.

[0011] According to one embodiment of the utility model, the upper cava is provided with a plurality of first cava tooth holes along the peripheral wall, and the plurality of first cava tooth holes are arranged upwardly inclined in a direction away from the lower cava, and the outer side of the lower cava is provided with a plurality of second cava tooth holes along the peripheral wall, and the plurality of second cava tooth holes are arranged downwardly inclined in a direction away from the cone.

[0012] According to one embodiment of the utility model, a soluble sealing ring is also included, and a sealing groove is arranged on the outer wall ring of one end of the core shaft close to the lower slip, and the soluble sealing ring is arranged in the sealing groove.

[0013] According to one embodiment of the utility model, a third conical surface is provided on the inner wall of the setting ring at one end away from the upper slip.

[0014] According to an embodiment of the utility model, the main body further comprises a plurality of anti-rotation screws, the outer side wall of the guide shoe is provided with a plurality of anti-rotation screw holes, and each anti-rotation screw hole is provided with an anti-rotation screw.

[0015] According to one embodiment of the utility model, a shearing thread is arranged on the inner wall of the guide shoe.

[0016] The beneficial effect of the utility model is that, by arranging an elastic ratchet part on the mandrel, when the metal double slip soluble bridge plug is set, the elastic ratchet part and the ratchet part of the cone are locked with each other, thereby enhancing the stability of the metal double slip soluble bridge plug structure. Moreover, the main body of the metal double slip soluble bridge plug is made of soluble material, with a short dissolution time and good dissolution effect, thus avoiding the situation that the metal double slip soluble bridge plug component is not completely dissolved and causes the production pipeline to be blocked. Moreover, the metal double slip soluble bridge plug in the present application has a simple structure, low manufacturing cost, small size, and can adapt to a wider range of uses. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0018] Figure 1is a cross-sectional view of a metal double slip soluble bridge plug in an embodiment;

[0019] Figure 2 An exploded view of the metal double slip soluble bridge plug in the embodiment;

[0020] Figure 3 is a schematic diagram of a mandrel in an embodiment;

[0021] Figure 4 is a schematic diagram of a seat seal ring in an embodiment;

[0022] Figure 5 Schematic diagram of the upper slip in the embodiment;

[0023] Figure 6 A schematic diagram of the connection between the metal double slip soluble bridge plug and the adapter in the embodiment;

[0024] Figure 7 It is a schematic diagram of the metal double slip soluble bridge plug after being set in the embodiment.

[0025] Description of Reference Numerals

[0026] 1-body; 2-soluble sealing ring; 3-soluble sealing ring; 4-fracturing ball; 11-sealing ring; 12-mandrel; 13-upper slip; 14-cone; 15-lower slip; 16-guide shoe; 17-tightening ring; 18-anti-rotation screw; 100-adapter; 111-first clutch platform; 112-first clutch groove; 113-third cone surface; 114-fastening screw hole; 121-sealing spherical surface; 122-elastic ratchet portion; 123-sealing groove; 131-first cone surface; 13 2-first release groove; 133-second clutch platform; 134-second clutch groove; 135-matching groove; 136-first cava tooth hole; 140-ratchet structure; 141-upper cone surface; 142-lower cone surface; 143-shear screw hole; 144-shear screw; 151-second cone surface; 152-second cava tooth hole; 153-second release groove; 161-anti-rotation screw hole; 200-sleeve; 1221-elastic ratchet; 1421-first clamping tooth; 1511-second clamping tooth. DETAILED DESCRIPTION

[0027] The following will disclose multiple embodiments of the present invention with drawings. For the purpose of clear description, many practical details will be described together in the following description. However, it should be understood that these practical details should not be used to limit the present invention. In other words, in some embodiments of the present invention, these practical details are not necessary. In addition, in order to simplify the drawings, some conventional structures and components will be depicted in a simple schematic manner in the drawings.

[0028] In addition, in the present utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present utility model. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0029] Please refer to Figure 1 and Figure 2 , Figure 1 is a cross-sectional view of the metal double slip soluble bridge plug in this embodiment, Figure 2 The exploded diagram of the metal double slip soluble bridge plug in this embodiment. This embodiment provides a metal double slip bridge plug, which includes a body 1 made of soluble metal, the body 1 includes a sealing ring 11, a core shaft 12, an upper slip 13, a cone 14, a lower slip 15 and a guide shoe 16, the sealing ring 11, the upper slip 13, the cone 14 and the lower slip 15 are sequentially sleeved on the core shaft 12 along the axial direction of the core shaft 12, wherein the sealing ring 11 is sleeved on one end of the core shaft 12, one end of the lower slip 15 is sleeved on the other end of the core shaft 12, and the upper slip 13 and the cone 14 are sleeved on the outside of the core shaft 12, so that the upper slip 13 is located between the sealing ring 11 and the cone 14, and the cone 14 is located between the upper slip 13 and the lower slip 15. The sealing ring 11 is connected to the upper slip 13, the lower slip 15 is connected to the other end of the cone 14, and the inner wall of the lower slip 15 is in contact with the surface of the cone 14, and the guide shoe 16 is connected to the other end of the lower slip 15. The inner wall of one end of the mandrel 12 close to the sealing ring 11 forms a sealing spherical surface 121, and the end of the mandrel 12 close to the cone 14 is provided with an elastic ratchet part 122, and the inner wall of the cone 14 is provided with a ratchet structure 140 matched with the elastic ratchet part 122.

[0030] In this embodiment, the inner wall of the setting ring 11 is connected to the core shaft 12 by a threaded connection. A plurality of shear screw holes 143 are provided at the connection between the cone 14 and the core shaft 12, and a shear screw 144 is installed corresponding to each shear screw hole 143. The cone 14 and the core shaft 12 are connected by the shear screw 144. The taper of the sealing spherical surface 121 is 20°-60°. The elastic ratchet portion 122 is elastic, so that the core shaft 12 can be contracted or expanded relative to the cone 14.

[0031] Before the downhole operation, the adapter 100 is connected to the metal double slip soluble bridge plug. The adapter 100 is used to send the metal double slip soluble bridge plug into the casing 200 in the well, so that the metal double slip soluble bridge plug completes the sealing in the preset position in the well. During the sealing process, the adapter 100 pushes the sealing ring 11, the core shaft 12, the upper slip 13 and the cone 14 to move in the direction of the guide shoe 16. During the sealing process, the pressure in the well will cut off the shear screw 144, so that the upper slip 13 is close to the cone 14. Under the action of pressure, the core shaft 12 moves relative to the cone 14, and the elastic ratchet part 122 is engaged with the ratchet structure 140, so that the core shaft 12 and the cone 14 are locked. Because the elastic ratchet part 122 is unidirectional, when the pressure in the well presses upward, the core shaft 12 and the cone 14 are prevented from separating, and the stability of the metal double slip soluble bridge plug structure is enhanced, so that the metal double slip soluble bridge plug is not easy to separate as a whole. When the sealing is completed, the upper slip 13 and the lower slip 15 are anchored to the casing 200, so that the metal double slip soluble bridge plug is fixed to the casing 200, which is convenient for subsequent fracturing operations.

[0032] In this embodiment, a fracturing ball 4 is also included. After the metal double slip soluble bridge plug is set, the fracturing ball 4 is put into the well, the fracturing ball 4 is seated on the sealing spherical surface 121, and the core shaft 12 is sealed, so that the fracturing ball 4 seals the inside of the metal double slip soluble bridge plug. The pressure is transmitted to the metal double slip soluble bridge plug through the fracturing ball 4, further strengthening the sealing performance of the metal double slip soluble bridge plug.

[0033] It should be noted that the sealing ring 11, the mandrel 12, the upper slip 13, the cone 14, the lower slip 15, the guide shoe 16 and the fracturing ball 4 are all made of soluble materials and can be completely dissolved within a period of time. Compared with the traditional bridge plug with a rubber cartridge, the metal double slip soluble bridge plug in the present application has no rubber cartridge, has a short dissolution time, and can be completely dissolved, avoiding the risk of the undissolved rubber cartridge affecting the normal operation of the production pipeline, and has a simple structure, saves more raw materials, and effectively reduces the manufacturing cost.

[0034] Please continue to refer to Figure 1 and Figure 2In order to realize the sealed connection between the cone 14 and the casing 200, the metal double slip soluble bridge plug in this embodiment also includes a soluble sealing ring 2, which is arranged on the lower conical surface 142 of the cone 14, and the soluble sealing ring 2 is a spiral structure. During the setting process, the adapter 100 pushes the setting ring 11, the core shaft 12, the upper slip 13 and the cone 14 to move in the direction of the guide shoe 16, and the lower conical surface 142 of the cone 14 presses against the soluble sealing ring 2, so that the soluble sealing ring 2 is circumferentially rotated and stretched. After setting, the soluble sealing ring 2 seals the space between the cone 14 and the inner wall of the casing 200. Preferably, the soluble sealing ring 2 is made of a soluble material, which has good stability and avoids the failure of the seal caused by the high temperature and high pressure environment downhole.

[0035] Please refer to Figure 3 , Figure 3 Schematic diagram of the core shaft in this embodiment. The elastic ratchet portion 122 includes a plurality of elastic ratchet pieces 1221, and the plurality of elastic ratchet pieces 1221 are arranged equidistantly in the circumferential direction. The elasticity of the elastic ratchet portion 122 is positively correlated with the density and length of the elastic ratchet pieces 1221. When the density of the elastic ratchet pieces 1221 is greater, the elasticity of the elastic ratchet portion 122 is better. When the length of the elastic ratchet pieces 1221 is longer, the elasticity of the elastic ratchet portion 122 is also better.

[0036] refer to Figure 1 and Figure 2 In order to further strengthen the sealing between the mandrel 12 and the cone 14, the metal double slip soluble bridge plug also includes a soluble sealing ring 3. A sealing groove 123 is provided at one end of the mandrel 12 close to the lower slip 15, and the soluble sealing ring 3 is arranged in the sealing groove 123. When the mandrel 12 is connected to the cone 14, the soluble sealing ring 3 is arranged between the mandrel 12 and the cone 14 to seal the annular space between the mandrel 12 and the cone 14 to achieve a sealing effect.

[0037] In order to enhance the overall sealing performance of the metal double slip soluble bridge plug, the outer side of the cone 14 near one end of the upper slip 13 is inscribed inward to form an upper conical surface 141, and the inner wall of the upper slip 13 is provided with a first conical surface 131 matching the upper conical surface 141, and the outer side of the cone 14 near one end of the lower slip 15 is inscribed inward to form a lower conical surface 142, and the inner wall of the lower slip 15 is provided with a second conical surface 151 matching the lower conical surface 142.

[0038] In this embodiment, the taper of the upper conical surface 141 is 10°-60°, and the taper of the first conical surface 131 is 10°-60°. When the metal double slip soluble bridge plug is seated, the upper slip 13 and the lower slip 15 are spread apart by the cone 14, the first conical surface 131 fits with the upper conical surface 141, and the second conical surface 151 fits with the lower conical surface 151. By increasing the fit between the upper slip 13 and the cone 14 and the fit between the lower slip 15 and the cone 14, the overall sealing of the metal double slip soluble bridge plug is enhanced.

[0039] During the setting operation, the upper slip 13, the cone 14 and the lower slip 15 are compressed, so that the three are pushed toward the guide shoe 16. The upper slip 13 is forced to approach the cone 14, so that the upper cone surface 141 is more closely fitted with the first cone surface 131, and the cone 14 is forced to approach the lower slip 15, so that the lower cone surface 142 is more closely fitted with the second cone surface 151. After the metal double slip soluble bridge plug is set, the upper cone surface 141 is forced by the first cone surface 131, so that the upper slip 13 is stretched open by the cone 14, and the lower cone surface 142 is forced by the second cone surface 151, so that the lower slip 15 is stretched open by the cone 14. In this way, the upper slip 13 and the lower slip 15 anchor the casing 200 respectively.

[0040] Preferably, the surface of the lower conical surface 142 is provided with a first latching tooth 1421, which is inclined upward in a direction away from the lower slip 15, and the surface of the second conical surface 151 is provided with a second latching tooth 1511, which is inclined downward in a direction away from the cone 14, and the first latching tooth 1421 can be engaged with the second latching tooth 1511. Before the metal double slip soluble bridge plug is set, the first latching tooth 1421 and the second latching tooth 1511 are not engaged with each other, and after the metal double slip soluble bridge plug is set, the first latching tooth 1511 and the second latching tooth are engaged with each other, so that the cone 14 and the lower slip 15 are locked with each other, so as to prevent the cone 14 and the lower slip 15 from slipping off when the metal double slip soluble bridge plug is affected by the downhole pressure after setting.

[0041] Please refer to Figure 1 and Figure 2 The upper slip 13 is provided with a plurality of first slip holes 136 along the peripheral wall, and the plurality of first slip holes 136 are tilted downward in the direction close to the cone 14, and the lower slip 15 is provided with a plurality of second slip holes 152 along the peripheral wall, and the second slip holes 152 are tilted upward in the direction close to the cone 14, so that the tilt direction of the plurality of second slip holes 152 is opposite to that of the first slip holes 136. A slip tooth is installed in each first slip hole 136 and each second slip hole 152, respectively. After the metal double slip soluble bridge plug is set, the upper slip 13 and the lower slip 15 are propped open by the cone 14, and the slip teeth bite into the casing 200, thereby strengthening the connection between the upper slip and the lower slip and the casing 200, respectively.

[0042] Preferably, the number of the first slip tooth holes 136 is 12-16, and the number of the second slip tooth holes 152 is 32-48. The first slip tooth hole 136 is inclined downwardly at an angle of 75° in the direction close to the cone 14. When setting, the slip teeth in the first slip tooth hole 136 bite into the casing 200 in the direction of the inclined angle, so that the upper slip 13 can withstand the upward pressure in the well; the second slip tooth hole 152 is inclined upwardly at 75° in the direction close to the cone 14, and the slip teeth in the second slip tooth hole 152 bite into the casing 200 in the direction of the inclined angle, so that the lower slip 15 can withstand the downward pressure from the wellhead. With this arrangement, the anchoring force of the metal double slip soluble bridge plug is further strengthened, so that the metal double slip soluble bridge plug is anchored in the casing 200 after setting, and will not move relative to the casing 200 when subjected to force.

[0043] Please refer to Figure 4 and Figure 5 , Figure 4 Schematic diagram of the setting ring in this embodiment. Figure 5 It is a schematic diagram of the lower slip in this embodiment. Furthermore, the end of the sealing ring 11 close to the upper slip 13 has a plurality of first clutch platforms 111, the plurality of first clutch platforms 111 are arranged at intervals, and a first clutch groove 112 is provided between two adjacent first clutch platforms 111. The end of the upper slip 13 close to the sealing ring 11 is provided with a plurality of second clutch platforms 133, and a second clutch groove 134 is provided between two adjacent second clutch platforms 133. When the sealing ring 11 is connected to the upper slip 13, a second clutch platform 133 is engaged in each first clutch groove 112, and a first clutch platform 111 is engaged in each second clutch groove 134, so that the sealing ring 11 and the upper slip 13 are mutually engaged and connected. With this arrangement, during the sealing operation, the plurality of first clutch grooves 112 guide the plurality of second clutch platforms 133 to open evenly.

[0044] Preferably, a first release groove 132 is formed between two adjacent second clutch platforms 133, and a second release groove 153 is formed between two adjacent second clutch grooves 133. The first release groove 132 and the second release groove 153 are respectively used to reduce the expansion force of the upper cava 13 and the lower cava 15, so that the upper cava 13 and the lower cava 15 can be opened more evenly.

[0045] Please continue to refer to Figure 5The body 1 further comprises a clamping ring 17. A matching groove 135 is provided at one end of the upper slip 13 close to the cone 14. The clamping ring 17 is arranged in the matching groove 135. In this embodiment, the longitudinal section of the clamping ring 17 is an "L"-shaped structure. The clamping ring 17 is arranged at the connection between the upper slip 13 and the cone 14 and is engaged with the matching groove 135 to prevent the upper slip 13 from bursting in advance due to an accident during the process of entering the well, causing the metal double slip soluble bridge plug to be set in advance. At the same time, it plays the role of clamping the upper slip 13 to prevent the upper slip 13 from bursting and separating from the cone 14 after the metal double slip soluble bridge plug is set.

[0046] Preferably, the inner wall of the setting ring 11 at one end away from the upper slip 13 is provided with a third conical surface 113, which is used to guide the fracturing ball 4 to fall into the core shaft 12, and the taper of the third conical surface 113 is 20°-60°.

[0047] Furthermore, a plurality of anti-rotation screw holes 161 are provided on the guide shoe 16, and an anti-rotation screw 18 is provided in each anti-rotation screw hole 161. When the metal double-slip soluble bridge plug is connected to the adapter 100, the anti-rotation screw 18 locks the guide shoe 16 on the adapter 100, thereby preventing the guide shoe 16 from rotating and falling off.

[0048] Please refer to Figure 6 and Figure 7 , FIG6 is a schematic diagram of the connection between the metal double slip soluble bridge plug and the adapter 100, Figure 7 The schematic diagram of the structure of the metal double slip soluble bridge plug after setting. The working principle of the metal double slip soluble bridge plug in this embodiment is as follows:

[0049] The adapter 100 is connected to the metal double slip soluble bridge plug. The adapter 100 is used to push the setting ring 11 to complete the setting of the metal double slip soluble bridge plug. The side wall of the setting ring 11 away from the upper slip 13 is provided with a plurality of fastening screw holes 114, each of which is installed with a fastening screw. The setting ring 11 is connected to the adapter 100 by installing the fastening screw. The surface of the inner hole of the guide shoe 16 is provided with a shearing thread, and the guide shoe 16 is connected to the adapter 100 through the shearing thread.

[0050] After the metal double slip soluble bridge plug is pumped to the setting position, the adapter 100 pushes the setting ring 11. When the pressure reaches a preset value, the fastening screws between the setting ring 11 and the adapter 100 are sheared off.

[0051] The adapter 100 continues to push the sealing ring 11, the core shaft 12, the upper slip 13 and the cone 14 to move toward the guide shoe 16. As the cone 14 pushes, the soluble sealing ring 2 is rotated and expanded by the cone 14 in the circumferential direction, and the multiple second clutch platforms 133 of the upper slip 13 are evenly expanded by the cone 14. At this time, the soluble sealing ring 2, the lower slip 15 and the guide shoe 16 have no obvious displacement.

[0052] The adapter 100 continues to push the sealing ring 11, the core shaft 12, the upper slip 13 and the cone 14 to move toward the guide shoe 16, the shear screw 144 at the connection between the cone 14 and the core shaft 12 is sheared, the upper slip 13 and the clamping ring 17 are radially stretched open by the cone 14, and the upper slip 13 bites into the casing 200.

[0053] The adapter 100 continues to push the sealing ring 11 toward the guide shoe 16, so that the lower slip 15 anchors the inner wall of the casing 200, the soluble sealing ring 2 seals the annular space between the casing 200 and the cone 14, the soluble sealing ring 3 seals the space between the core shaft 12 and the cone 14, and the elastic ratchet portion 122 of the core shaft 12 is inserted into the ratchet structure 140 on the inner wall of the cone 14, so that the core shaft 12 and the cone 14 are locked with each other, and the upper slip 13 anchors the inner wall of the casing 200.

[0054] As the adapter 100 continues to push the sealing ring 11, the upper slip 13 and the lower slip 15 are anchored to the casing 200 more and more firmly, the sealing performance of the soluble sealing ring 2 is better, and the adapter 100 continues to push the sealing ring 11 to move in the direction of the guide shoe 16 until the shear thread between the guide shoe 16 and the adapter 100 is sheared, the guide shoe 16 falls into the well, and the metal double slip soluble bridge plug completes the sealing. At this time, the upper slip 13 and the lower slip 15 anchor the casing 200 to prevent the metal double slip soluble bridge plug from moving relative to the casing 200.

[0055] The adapter 100 is pulled out, and the fracturing ball 4 is dropped into the well. The fracturing ball 4 is seated on the sealing spherical surface of the core shaft 12. At this time, the upper and lower parts of the metal double slip soluble bridge plug are sealed, and the fracturing operation can be started by pumping high-pressure fluid into the upper part of the metal double slip soluble bridge plug. During the fracturing operation, the pressure squeezes the fracturing ball 4, the cone 14, the core shaft 12 and the soluble sealing ring 2 downward, the teeth of the lower slip 15 and the casing 200 are embedded deeper and deeper, the soluble sealing ring 2 is pressed tighter and tighter, and the anchoring performance and sealing performance of the metal double slip soluble bridge plug are stronger.

[0056] In summary, by providing an elastic ratchet portion 122 on the core shaft 12, when the metal double-slip soluble bridge plug is sealed, the elastic ratchet portion 122 and the ratchet portion 140 of the cone 14 are locked with each other, thereby enhancing the stability of the metal double-slip soluble bridge plug structure. Moreover, the main body 1 of the metal double-slip soluble bridge plug is made of soluble materials, with a short dissolution time and a good dissolution effect, thereby avoiding the situation in which the metal double-slip soluble bridge plug components are not completely dissolved and cause blockage of the production pipeline. By adopting a soluble sealing ring 2, its pressure-bearing performance is better, the dissolution effect is better, it is less affected by temperature, and the sealing effect is better. Moreover, the metal double-slip soluble bridge plug in the present application has a simple structure, low manufacturing cost, and small size, and can adapt to a wider range of uses.

[0057] The above description is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the claims of the present invention.

Claims

1. A metal double slip soluble bridge plug, characterized in that: include: A body (1) made of soluble metal, the body (1) comprising a sealing ring (11), a core shaft (12), an upper slip (13), a cone (14), a lower slip (15) and a guide shoe (16); the sealing ring (11), the upper slip (13), the cone (14) and the lower slip (15) are sequentially sleeved on the core shaft (12) along the axial direction of the core shaft (12); the guide shoe (16) is connected to one end of the lower slip (15) away from the cone (14); a sealing spherical surface (121) is formed on the inner wall of one end of the core shaft (12); an elastic ratchet portion (122) is provided at the other end of the core shaft (12); and a ratchet structure (140) cooperating with the elastic ratchet portion (122) is provided on the inner wall of the cone (14).

2. The metal double slip soluble bridge plug according to claim 1 is characterized in that: The outer side of one end of the cone (14) close to the upper cava (13) is cut inward to form an upper conical surface (141), and the inner wall of the upper cava (13) is provided with a first conical surface (131) matching with the upper conical surface (141). The outer side of one end of the cone (14) close to the lower cava (15) is cut inward to form a lower conical surface (142), and the inner wall of the lower cava (15) is provided with a second conical surface (151) matching with the lower conical surface (142).

3. The metal double slip soluble bridge plug according to claim 2 is characterized in that: It also comprises a soluble sealing ring (2), wherein the soluble sealing ring (2) is arranged on the lower conical surface (142), and the soluble sealing ring (2) is a spiral structure.

4. The metal double slip soluble bridge plug according to claim 1, characterized in that: The end of the setting ring (11) close to the upper slip (13) is provided with a plurality of first clutch platforms (111) arranged at intervals, and a first clutch groove (112) is provided between two adjacent first clutch platforms (111); the end of the upper slip (13) close to the setting ring (11) is provided with a plurality of second clutch platforms (133) arranged at intervals, and a second clutch groove (134) is provided between two second clutch platforms (133); when the setting ring (11) is connected to the upper slip (13), one of the second clutch platforms (133) is buckled in each of the first clutch grooves (112), and one of the first clutch platforms (111) is buckled in each of the second clutch grooves (134).

5. The metal double slip soluble bridge plug according to claim 1, characterized in that: The body (1) further comprises a clamping ring (17), an outer wall ring of one end of the upper slip (13) close to the cone (14) is provided with a matching groove (135), and the clamping ring (17) is arranged in the matching groove (135).

6. The metal double slip soluble bridge plug according to claim 1, characterized in that: The upper cava (13) is provided with a plurality of first cava tooth holes (136) along the peripheral wall, and the plurality of first cava tooth holes (136) are arranged upwardly inclined in a direction away from the lower cava (15); the outer side of the lower cava (15) is provided with a plurality of second cava tooth holes (152) along the peripheral wall, and the plurality of second cava tooth holes (152) are arranged downwardly inclined in a direction away from the cone (14).

7. The metal double slip soluble bridge plug according to claim 1, characterized in that: It also comprises a soluble sealing ring (3); a sealing groove (123) is provided on the outer wall of one end of the core shaft (12) close to the lower slip (15); and the soluble sealing ring (3) is arranged in the sealing groove (123).

8. The metal double slip soluble bridge plug according to claim 1, characterized in that: A third conical surface (113) is provided on the inner wall of the setting ring (11) at one end away from the upper slip (13).

9. The metal double slip soluble bridge plug according to claim 1, characterized in that: The body (1) further comprises a plurality of anti-rotation screws (18), the outer side wall of the guide shoe (16) is provided with a plurality of anti-rotation screw holes (161), and each anti-rotation screw hole (161) is provided with an anti-rotation screw (18).

10. The metal double slip soluble bridge plug according to claim 1, characterized in that: The inner wall of the guide shoe (16) is provided with a shearing thread.

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