Guide shoe expansion type all-metal soluble bridge plug

Abstract

The utility model discloses a guiding shoe expansion type all-metal soluble bridge plug which comprises a guiding shoe, a lower guiding shoe seat, an upper guiding shoe seat, a slip, a sealing ring and a cone which are made of soluble metal and coaxially connected in sequence. A plurality of sliding grooves inclining towards the center shaft are distributed in the circumferential side of the lower guiding shoe base, and each sliding groove comprises a first notch and a second notch which are identical in inclination angle and connected. A first guide block and a second guide block which are the same in structure are oppositely arranged on the left side and the right side of the second notch. The upper guiding shoe seat comprises a plurality of upper guiding shoe seat units and a plurality of connecting blocks which are the same in number, and the upper guiding shoe seat units correspond to the sliding grooves in a one-to-one mode; the upper guiding shoe seat unit is of a bilateral symmetry structure; the first guide block and the second guide block are arranged in grooves in the left side and the right side of the upper guide shoe base unit in a sliding mode respectively. The lower guiding shoe seat and the upper guiding shoe seat are arranged, the upper guiding shoe seat is expanded in advance in the setting process, the guiding shoe can be prevented from entering the slip when the slip is expanded, and it is guaranteed that the slip can be anchored normally.

Description

Technical Field

[0001] The utility model relates to the technical field of oil exploitation, in particular to a guide shoe expansion type all-metal soluble bridge plug. Background Art

[0002] During the completion and fracturing operations of petroleum engineering, it is usually necessary to perform segmented fracturing operations on different layers of the vertical well, directional well or horizontal wellbore. During the segmented fracturing process, bridge plugs are required to achieve interlayer isolation.

[0003] The downhole casing is seriously deformed. There are two main problems when using bridge plugs to plug the casing: 1. When the outer diameter of the bridge plug is reduced, the inner diameter is also reduced, and the corresponding puller rod is also small, resulting in a decrease in the number of shear pins and a decrease in shear force; 2. The outer diameter of the bridge plug is reduced, the expansion area is increased, and the required shear force is increased. However, due to the decrease in shear caused by problem 1, the bridge plug is not fully expanded, and the anchoring and plugging effects are poor. Utility Model Content

[0004] In view of the above problems, the utility model aims to provide a guide shoe expansion type all-metal soluble bridge plug. During the sealing process, the upper guide shoe seat is expanded first, which can prevent the guide shoe from entering the slip when the slip expands, thereby ensuring that the slip can be anchored normally.

[0005] The technical solution of the utility model is as follows:

[0006] A guide shoe expansion type all-metal soluble bridge plug, comprising a guide shoe, a lower guide shoe seat, an upper guide shoe seat, a slip, a sealing ring and a cone, which are made of soluble metal and are coaxially connected in sequence;

[0007] The lower shoe seat is cylindrical, and a plurality of slide grooves inclined toward the central axis are distributed on its circumference, and the slide groove includes a slot 1 and a slot 2 which are connected with the same inclination angle, the width of the slot 1 is smaller than the width of the slot 2, and the slot 2 is connected to the upper surface of the lower shoe seat; a guide block 1 and a guide block 2 with the same structure are arranged on the left and right sides of the slot 2, and the inclination angle of the guide block 1 is the same as the inclination angle of the slot 2;

[0008] The upper shoe seat comprises a plurality of upper shoe seat units and a plurality of connecting blocks of the same number, each of the upper shoe seat units corresponds to the slide groove one by one, the upper shoe seat units and the connecting blocks are connected at intervals and are distributed in a circular array; the upper shoe seat unit comprises a vertical surface 1 and a vertical surface 2 which are parallel to each other, and an upper surface, a vertical surface 3, a horizontal surface, an inclined surface 1, and a vertical surface 4 which are sequentially connected end to end, the vertical surface 4 is an arc surface, and the vertical surfaces 4 of the plurality of upper shoe seat units form a circular surface with the plurality of connecting blocks; the vertical surface 1 shares the same edge with the left sides of the upper surface, the vertical surface 3, the horizontal surface, the inclined surface 1, and the vertical surface 4, and the vertical surface 2 shares the same edge with the right sides of the upper surface, the vertical surface 3, the horizontal surface, the inclined surface 1, and the vertical surface 4;

[0009] The upper shoe seat unit is a bilaterally symmetrical structure; the vertical surface is provided with an opening 1, and the opening 1 is connected with the inclined surface 1 and the horizontal surface; the vertical surface is provided with a groove, and the groove connects the arc surface and the horizontal surface, and the depth of the groove is greater than the depth of the opening 1; the vertical surface is also provided with an opening 2 with the same depth as the groove, and the opening 2 is connected with the groove, the vertical surface 3 and the horizontal surface;

[0010] The inclination angle of the inclined surface 1 is the same as the inclination angle of the slide groove, the width of the inclined surface 1 is equal to the width of the slot 1, the guide block 1 and the guide block 2 are respectively slidably arranged in the grooves on the left and right sides of the upper shoe seat unit, the maximum width of the vertical surface 3 is less than or equal to the width of the slot 2 and greater than the width of the slot 1, and the minimum width of the horizontal plane is less than or equal to the distance between the guide block 1 and the guide block 2.

[0011] Preferably, the sealing ring comprises a lower sealing ring and an upper sealing ring which are coaxially arranged.

[0012] Preferably, both the lower sealing ring and the upper sealing ring are provided with fracture openings through wire cutting.

[0013] Preferably, the fracture openings of the lower sealing ring and the fracture openings of the upper sealing ring are arranged alternately up and down.

[0014] Preferably, an arc-shaped protrusion is provided on the upper surface of the lower guide shoe seat.

[0015] Preferably, the lower guide shoe seat consists of a first cylindrical section and a second cylindrical section which are connected in sequence and coaxially arranged, the inner wall of the first cylindrical section is provided with an internal thread, the upper surface of the guide shoe is provided with a threaded section which matches and is connected to the internal thread, the inner diameter of the second cylindrical section is smaller than the inner diameter of the first cylindrical section, and the slide groove is arranged on the second cylindrical section.

[0016] Preferably, the upper surface of the upper shoe seat is an inclined surface 2 protruding toward the slip direction, and the lower surface of the slip is an inner concave surface matching the inclined surface 2.

[0017] Preferably, the upper surface of the upper guide shoe seat is provided with a plurality of evenly distributed guide grooves, and the lower surface of the slip is provided with protrusions matching the guide grooves.

[0018] Preferably, six slide grooves and six upper shoe seat units are provided, and the slide grooves are evenly distributed along the circumference of the lower shoe seat.

[0019] Preferably, the slips are split-petal slips.

[0020] The beneficial effects of the utility model are:

[0021] The utility model can prevent the guide shoe from entering the slipper when the slipper expands by arranging the lower guide shoe seat and the upper guide shoe seat, thereby ensuring that the slipper can be anchored normally; by arranging the lower sealing ring and the upper sealing ring, the force required for setting the seal can be reduced, and good sealing performance can be maintained even after the expansion deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0023] Figure 1 This is a structural schematic diagram of the utility model of the guide shoe expansion type all-metal soluble bridge plug;

[0024] Figure 2 It is a cross-sectional view of the utility model of the guide shoe expansion type all-metal soluble bridge plug;

[0025] Figure 3 It is a structural schematic diagram of the upper guide shoe seat and the lower guide shoe seat of the guide shoe expansion type all-metal soluble bridge plug of the utility model;

[0026] Figure 4 It is a structural schematic diagram of the lower guide shoe seat of the guide shoe expansion type all-metal soluble bridge plug of the utility model;

[0027] Figure 5 It is a three-dimensional diagram of the upper guide shoe seat of the guide shoe expansion type all-metal soluble bridge plug of the utility model;

[0028] Figure 6 It is a structural schematic diagram of the upper guide shoe seat of the guide shoe expansion type all-metal soluble bridge plug of the utility model;

[0029] Figure 7 It is a structural schematic diagram of the guide shoe of the guide shoe-expanded all-metal soluble bridge plug of the utility model;

[0030] Figure 8 It is a structural schematic diagram of the slips of the guide shoe expansion type all-metal soluble bridge plug of the utility model;

[0031] Fig. 9 The utility model is a schematic diagram of the structure of the upper sealing ring and the lower sealing ring of the guide shoe expansion type all-metal soluble bridge plug.

[0032] Numbers in the figure: 1-guide shoe, 2-lower guide shoe seat, 3-upper guide shoe seat, 4-slip, 5-lower sealing ring, 6-upper sealing ring, 7-cone, 8-pumping rod joint, 9-pumping rod; 10-slide, 101-slot one, 102-slot two, 103-guide block one, 104-guide block two; 11-upper guide shoe seat unit, 111-groove, 112-guide groove, 113-step; 12-connecting block, 13-internal thread, 14-thread segment, 15-protrusion, 16-fracture. DETAILED DESCRIPTION

[0033] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0034] It should be noted that, in the absence of conflict, the embodiments in this application and the technical features in the embodiments may be combined with each other.

[0035] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0036] In the present invention, unless otherwise stated, the terms "first", "second", etc. are used to distinguish similar objects, rather than to describe a specific order or sequence. The terms used in this way should be understood; the terms "upper", "lower", "left", "right", etc. are usually used in relation to the directions shown in the drawings, or in relation to the components themselves in the vertical, perpendicular or gravity direction; similarly, for ease of understanding and description, "inner", "outer", etc. refer to the inside and outside relative to the outline of each component itself. However, the above-mentioned directional words are not used to limit the present invention.

[0037] like Figure 1-9 As shown, a guide shoe expansion type all-metal soluble bridge plug comprises a guide shoe 1, a lower guide shoe seat 2, an upper guide shoe seat 3, a slip 4, a sealing ring 5 and a cone 7 which are made of soluble metal and are coaxially connected in sequence;

[0038] The lower shoe seat 2 is cylindrical, and has a plurality of slide grooves 10 inclined toward the central axis distributed on its circumference, the slide groove 10 includes a slot 101 and a slot 2 102 with the same inclination angle and connected, the width of the slot 101 is smaller than the width of the slot 2 102, and the slot 2 102 is connected to the upper surface of the lower shoe seat 2; the left and right sides of the slot 2 102 are relatively provided with a guide block 103 and a guide block 2 104 with the same structure, and the inclination angle of the guide block 103 is the same as the inclination angle of the slot 2 102;

[0039] The upper shoe seat 3 includes a plurality of upper shoe seat units 11 and a plurality of connecting blocks 12 of the same number, each of the upper shoe seat units 11 corresponds to the slide groove 10 one by one, the upper shoe seat units 11 and the connecting blocks 12 are connected at intervals and are distributed in a circular array; the upper shoe seat unit 11 includes a vertical plane 1 and a vertical plane 2 which are parallel to each other, and an upper surface, a vertical plane 3, a horizontal plane, an inclined plane 1, and a vertical plane 4 which are sequentially connected end to end, the vertical plane 4 is an arc-shaped surface, and the vertical planes 4 of the plurality of upper shoe seat units 11 form a circular surface with the plurality of connecting blocks 12; the vertical plane 1 and the left sides of the upper surface, the vertical plane 3, the horizontal plane, the inclined plane 1, and the vertical plane 4 share the same edge, and the vertical plane 2 and the right sides of the upper surface, the vertical plane 3, the horizontal plane, the inclined plane 1, and the vertical plane 4 share the same edge;

[0040] The upper shoe seat unit 11 is a bilaterally symmetrical structure; the vertical surface 1 is provided with an opening 1, and the opening 1 is connected to the inclined surface 1 and the horizontal surface; the vertical surface 1 is provided with a groove 111, and the groove 111 connects the arc surface and the horizontal surface, and the depth of the groove 111 is greater than the depth of the opening 1; the vertical surface 1 is also provided with an opening 2 with the same depth as the groove 111, and the opening 2 is connected to the groove 111, the vertical surface 3 and the horizontal surface;

[0041] The inclination angle of the inclined surface one is the same as the inclination angle of the slide groove 10, the width of the inclined surface one is equal to the width of the slot one 101, the guide block one 103 and the guide block two 104 are respectively slidably arranged in the grooves on the left and right sides of the upper shoe seat unit 11, the maximum width of the vertical surface three is less than or equal to the width of the slot two 102 and greater than the width of the slot one 101, and the minimum width of the horizontal plane is less than or equal to the distance between the guide block one 103 and the guide block two 104.

[0042] In the above embodiment, by setting the lower shoe seat 2 and the upper shoe seat 3, when the upper shoe seat 3 is subjected to a downward thrust, the upper shoe seat 3 is guided by the slide groove 10 and expands along the inclined direction of the slide groove 10 toward a direction away from the central axis, the connecting block 12 is broken, and the opening 1 and the vertical surface 1 form a step. When the inclined surface 1 completely passes through the slot 2 102, the step abuts against the connecting surface between the slot 1 101 and the slot 2 102. At this time, the step acts as a limiter, and the lower shoe seat 2 is restricted and cannot move downward any further. The expansion of the upper shoe seat 3 can prevent the guide shoe 1 from entering the cava 4 when the cava 4 expands.

[0043] In a specific embodiment, the sealing ring 5 includes a coaxially arranged lower sealing ring 5 and an upper sealing ring 6. The lower sealing ring 5 and the upper sealing ring 6 are both provided with a fracture opening 16 by wire cutting. The fracture opening 16 of the lower sealing ring 5 and the fracture opening 16 of the upper sealing ring 6 are arranged alternately up and down. Optionally, the fracture opening 16 is composed of a connected vertical surface 1, a parallel surface, and a vertical surface 2.

[0044] In the above embodiment, when the sealing ring 5 of the above embodiment is used, the fracture opening 16 reserved by the wire cutting process can reduce the setting force required to open the sealing ring 5. By staggering the fracture opening 16 of the lower sealing ring 5 and the fracture opening 16 of the upper sealing ring 6 up and down, it is possible to avoid uneven force on the sealing ring 5 when it is under pressure after it is broken.

[0045] In a specific embodiment, an arc-shaped protrusion is provided on the upper surface of the lower shoe seat 2. By providing the arc-shaped protrusion on the upper surface of the lower shoe seat 2, the slide groove 10 has a longer length compared with the slide groove of the upper surface arranged horizontally while maintaining the same inclination angle, which effectively increases the sliding stroke of the upper shoe seat unit 11 in the slide groove 10.

[0046] In a specific embodiment, the lower guide shoe seat 2 is composed of a first cylindrical section and a second cylindrical section which are connected in sequence and coaxially arranged, the inner wall of the first cylindrical section is provided with an internal thread 13, the upper surface of the guide shoe 1 is provided with a threaded section 14 which matches and is connected to the internal thread, the inner diameter of the second cylindrical section is smaller than the inner diameter of the first cylindrical section, and the slide groove 10 is arranged on the second cylindrical section.

[0047] In a specific embodiment, the upper surface of the upper guide shoe seat 3 is an inclined surface 2 protruding toward the slip 4, and the lower surface of the slip 4 is an inner concave surface matching the inclined surface 2. The upper surface of the upper guide shoe seat 3 is provided with a plurality of evenly distributed guide grooves 112, and the lower surface of the slip 4 is provided with a protrusion matching the guide grooves 112.

[0048] In the above embodiment, by providing the matching inclined surface 2 and the inner concave surface, the force required for the slip 4 to deform during setting can be further reduced. By providing the matching guide groove 112 and the protrusion, the slip 4 and the upper shoe seat 3 can be prevented from being confused when being expanded, thereby playing a positioning and guiding role.

[0049] In a specific embodiment, six slide grooves 10 and six upper shoe seat units 11 are provided, and the slide grooves 10 are evenly distributed along the circumference of the lower shoe seat 2 .

[0050] In a specific embodiment, the slips 4 are split-petal slips. Optionally, the split-petal slips are six-petal slips.

[0051] It should be noted that the guide shoe 1, slip 4, cone 7, etc. are all commonly used sub-components in the bridge plug, and their specific structures are existing technologies and will not be repeated here.

[0052] In a specific embodiment, the inner diameter of the guide shoe of the utility model can be made larger. Specifically, the inner diameters of the guide shoe 1, the lower guide shoe seat 2 and the upper guide shoe seat 3 are the same and larger than the inner diameter of the slip 4. The inner diameter of the sealing ring 5 is located between the inner diameter of the slip 4 and the inner diameter of the guide shoe 1. In the embodiment of using the utility model, a pumping rod 9 matching the utility model is provided, the pumping rod is composed of a connected cylindrical segment 1, a cylindrical segment 2, a cylindrical segment 3 and a cylindrical segment 4, the outer diameters of the cylindrical segment 1 and the cylindrical segment 3 match the inner diameter of the guide shoe 1, and the outer diameters of the cylindrical segment 2 and the cylindrical segment 4 match the inner diameter of the slip 4. During assembly, the guide shoe 1 and the draw rod 9 are first connected with shear pins, and then the lower guide shoe seat 2, the upper guide shoe seat 3, the slip 4, the sealing ring 5 and the cone 7 are sequentially installed from the top, the top of the cylindrical section 4 is provided with threads, the draw rod 9 is threadedly connected with the draw rod joint 8, and then connected with the bridge plug as a sealing tool through the draw rod joint 8. When the all-metal soluble bridge plug of this embodiment is set, the slip 4 and the sealing ring 5 with a smaller inner diameter have been opened, and the draw rod 9 can be easily taken out from the top.

[0053] When the utility model is used, the bridge plug of the utility model is connected with its corresponding bridge plug adapter through the threaded hole on the guide shoe 1, and then is put into the well together with the bridge plug-perforating gun barrel string. After being sent down to the designed sealing position, the plug delivery tool is ignited or liquid is pumped into the ground for pressure, and the bridge plug thrust ring is pushed by the gas pressure generated by the gunpowder column or the liquid pressure generated by the pumped liquid, and moves downward, thereby pushing the cone 7, the upper guide shoe seat 3 and the sealing ring 5 to move downward, and the slip 4 is forced to expand outward, bite the inner wall of the casing to achieve anchoring, and at the same time, the lower guide shoe seat 2 is fixed, and the upper guide shoe seat 3 continues to move downward, and the upper guide shoe seat 3 is forced to expand, and the inner cavity of the casing is sealed after expansion; when the thrust reaches a certain value, the bridge plug is completely sealed and anchored; the thrust is continued to increase, the shear pin is sheared off, and the bridge plug is lost.

[0054] In a specific embodiment, the outer diameter of the guide shoe expansion type all-metal soluble bridge plug of the utility model is 60mm. When the thrust reaches 10 tons, the all-metal soluble bridge plug can be completely set and anchored. The utility model can be made into a small outer diameter all-metal soluble bridge plug, and can complete the setting under a smaller setting force.

[0055] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with the profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A guide shoe expansion type all-metal soluble bridge plug, characterized in that: It includes a guide shoe, a lower guide shoe seat, an upper guide shoe seat, a slip, a sealing ring and a cone which are made of soluble metal and are coaxially connected in sequence; The lower shoe seat is cylindrical, and a plurality of slide grooves inclined toward the central axis are distributed on its circumference, and the slide groove includes a slot 1 and a slot 2 which are connected with the same inclination angle, the width of the slot 1 is smaller than the width of the slot 2, and the slot 2 is connected to the upper surface of the lower shoe seat; a guide block 1 and a guide block 2 with the same structure are arranged on the left and right sides of the slot 2, and the inclination angle of the guide block 1 is the same as the inclination angle of the slot 2; The upper shoe seat comprises a plurality of upper shoe seat units and a plurality of connecting blocks of the same number, each of the upper shoe seat units corresponds to the slide groove one by one, the upper shoe seat units and the connecting blocks are connected at intervals and are distributed in a circular array; the upper shoe seat unit comprises a vertical surface 1 and a vertical surface 2 which are parallel to each other, and an upper surface, a vertical surface 3, a horizontal surface, an inclined surface 1, and a vertical surface 4 which are sequentially connected end to end, the vertical surface 4 is an arc surface, and the vertical surfaces 4 of the plurality of upper shoe seat units form a circular surface with the plurality of connecting blocks; the vertical surface 1 shares the same edge with the left sides of the upper surface, the vertical surface 3, the horizontal surface, the inclined surface 1, and the vertical surface 4, and the vertical surface 2 shares the same edge with the right sides of the upper surface, the vertical surface 3, the horizontal surface, the inclined surface 1, and the vertical surface 4; The upper shoe seat unit is a bilaterally symmetrical structure; the vertical surface is provided with an opening 1, and the opening 1 is connected with the inclined surface 1 and the horizontal surface; the vertical surface is provided with a groove, and the groove connects the arc surface and the horizontal surface, and the depth of the groove is greater than the depth of the opening 1; the vertical surface is also provided with an opening 2 with the same depth as the groove, and the opening 2 is connected with the groove, the vertical surface 3 and the horizontal surface; The inclination angle of the inclined surface 1 is the same as the inclination angle of the slide groove, the width of the inclined surface 1 is equal to the width of the slot 1, the guide block 1 and the guide block 2 are respectively slidably arranged in the grooves on the left and right sides of the upper shoe seat unit, the maximum width of the vertical surface 3 is less than or equal to the width of the slot 2 and greater than the width of the slot 1, and the minimum width of the horizontal plane is less than or equal to the distance between the guide block 1 and the guide block 2.

2. The guide shoe expansion type all-metal soluble bridge plug according to claim 1 is characterized in that: The sealing ring comprises a lower sealing ring and an upper sealing ring which are coaxially arranged.

3. The guide shoe expansion type all-metal soluble bridge plug according to claim 2 is characterized in that: The lower sealing ring and the upper sealing ring are both provided with fracture openings through wire cutting.

4. The guide shoe expansion all-metal soluble bridge plug according to claim 3 is characterized in that: The fracture openings of the lower sealing ring and the fracture openings of the upper sealing ring are arranged alternately up and down.

5. The guide shoe expansion type all-metal soluble bridge plug according to claim 1 is characterized in that: The upper surface of the lower guide shoe seat is provided with an arc-shaped protrusion.

6. The guide shoe expansion type all-metal soluble bridge plug according to claim 1, characterized in that: The lower guide shoe seat is composed of a first cylindrical section and a second cylindrical section which are connected in sequence and arranged coaxially, the inner wall of the first cylindrical section is provided with an internal thread, the upper surface of the guide shoe is provided with a threaded section which matches and is connected to the internal thread, the inner diameter of the second cylindrical section is smaller than the inner diameter of the first cylindrical section, and the slide groove is arranged on the second cylindrical section.

7. The shoe-expandable all-metal soluble bridge plug according to claim 1, characterized in that: The upper surface of the upper shoe seat is an inclined surface 2 protruding toward the slip direction, and the lower surface of the slip is an inner concave surface matching the inclined surface 2.

8. The all-metal soluble bridge plug according to claim 7, characterized in that: The upper surface of the upper guide shoe seat is provided with a plurality of evenly distributed guide grooves, and the lower surface of the slip is provided with protrusions matching the guide grooves.

9. The all-metal soluble bridge plug with extended guide shoe according to claim 1, characterized in that: The number of the slide grooves and the number of the upper shoe seat units are both 6, and the slide grooves are evenly distributed along the circumference of the lower shoe seat.

10. The guide shoe expansion type all-metal soluble bridge plug according to claim 1, characterized in that: The slips are split-petal slips.

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