Air-tight seal suspension packer

Abstract

The invention relates to an air-tight seal suspension packer which comprises a central pipe, a suspension mechanism and a setting mechanism, and the suspension mechanism comprises a first slip cone, a slip bowl and a second slip cone which are sequentially arranged on the central pipe at intervals in the axial direction; the slip bowl is provided with a first slip and a second slip which correspond to the first slip cone and the second slip cone respectively. The setting mechanism is arranged on the center pipe and used for providing setting force for the first slip cone. The air-tight seal suspension packer has a setting state and a non-setting state. In the setting state, setting force drives the first slip cone to move towards the side close to the slip bowl, the first slip cone abuts against and pushes the slip bowl to be close to the second slip cone, and the first slip and the second slip are opened by the first slip cone and the second slip cone respectively and anchored on the inner wall of the casing pipe.

Description

Technical Field

[0001] The invention relates to the technical field of oil and gas downhole tools, and in particular to an air-tight suspension packer. Background Art

[0002] A packer is a downhole tool used in oil and gas extraction and related engineering fields. It can form a seal at a specific location in the wellbore or casing to separate different well sections, thereby achieving control and isolation of the fluid.

[0003] The prior art discloses a suspension seal device, which includes a center rod, a slip, a slip cone and a liquid cylinder, wherein the slip and the slip cone are sequentially arranged on the center rod, and the liquid cylinder is arranged between the slip cone and the center rod, and forms a closed cavity connected to the inside of the center rod with the slip cone and the center rod, wherein when the fluid inside the center rod enters the closed cavity, it can push the slip cone upward, so that the slip and the slip cone are matched and anchored on the inner wall of the casing, thereby realizing the suspension function of the suspension seal device. However, only using a single slip for anchoring may cause the position to loosen or deviate under some complex working conditions, thereby affecting the stability and reliability of the setting seal. Summary of the invention

[0004] The object of the present invention is to provide a gas-tight suspension packer, which solves the technical problem of how to improve the stability and reliability of setting.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions.

[0006] The present invention provides an air-tight suspension packer, which comprises: a center pipe; a suspension mechanism, comprising a first slip cone, a slip seat and a second slip cone which are arranged on the center pipe in sequence along the axial direction, and the slip seat is provided with a first slip and a second slip corresponding to the first slip cone and the second slip cone respectively; a sealing mechanism, which is arranged on the center pipe, and the sealing mechanism is used to provide a sealing force to the first slip cone; the air-tight suspension packer has a sealing state and an unsealed state; wherein, in the sealing state, the sealing force drives the first slip cone to move toward a side close to the slip seat, the first slip cone pushes the slip seat close to the second slip cone, and the first slip and the second slip are respectively spread apart by the first slip cone and the second slip cone, and anchored on the inner wall of the casing.

[0007] In some embodiments of the present application, the suspension mechanism also includes a sleeve mounted outside the center tube, the sleeve is fixedly connected to the cava seat, and is respectively connected to the first cava cone and the second cava cone through pins, and the second cava cone is fixedly connected to the center tube.

[0008] In some embodiments of the present application, the first cava cone includes a main body portion which is sleeved outside the center tube, a plurality of connecting portions which are circumferentially spaced around the main body portion, and a conical plate which is arranged between two adjacent connecting portions, wherein the conical plate has a slope and is used to support the first cava; in the unsealed state, the first cava is positioned between two adjacent connecting portions and is spaced apart from the conical plate; in the sealed state, the first cava is radially supported outward by the conical plate and extends out between two adjacent connecting portions.

[0009] In some embodiments of the present application, limit strips are provided on opposite sides of the connecting part, and matching strips are provided on opposite sides of the first cava; in the unsealed state, the matching strips on both sides of the first cava are respectively opposite to the adjacent two limit strips of the two adjacent connecting parts to prevent the first cava from extending out between the two adjacent connecting parts; in the sealed state, the adjacent two limit strips of the two adjacent connecting parts are misaligned with the matching strips on both sides of the first cava.

[0010] In some embodiments of the present application, a positioning hole is provided on the first slip cone, a guide hole is provided on the center tube which is elongated and extends axially, and the airtight suspension packer also includes a guide column which is locked in the positioning hole and extends into the guide hole.

[0011] In some embodiments of the present application, the sealing mechanism includes a hydraulic cylinder and a connecting sleeve, and the hydraulic cylinder, the connecting sleeve and the center tube are combined to form a hydraulic chamber; the center tube is provided with pressure transmission holes respectively connected to the interior of the center tube and the hydraulic chamber; the pressure transmission holes, the hydraulic cylinder and the connecting sleeve are grouped to form a power group, and the power group is provided with several groups, and the several groups of power groups are arranged in sequence from the side away from the first cava cone to the side close to the first cava cone, and the connecting sleeve of the first group of two adjacent power groups is abutted against the hydraulic cylinder of the latter group, and the connecting sleeve of the power group of the tail group is used to drive the first cava cone.

[0012] In some embodiments of the present application, the air-tight suspension packer also includes a rubber cartridge, which is disposed between the sealing mechanism and the first cava cone and is slidably mounted on the outside of the center pipe; in the sealing state, the sealing mechanism drives the rubber cartridge to move toward the side close to the first cava cone by providing a sealing force, and causes the rubber cartridge to push the first cava cone, and the rubber cartridge is squeezed between the sealing mechanism and the first cava cone and fits against the inner wall of the casing.

[0013] In some embodiments of the present application, the rubber cylinder includes a first metal shoulder guard, a first end rubber cylinder, a first main rubber cylinder, a second main rubber cylinder, a second end rubber cylinder and a second metal shoulder guard which are sequentially axially sleeved on the center tube, and spacer rings are provided between the first end rubber cylinder and the first main rubber cylinder, between the first main rubber cylinder and the second main rubber cylinder, and between the second main rubber cylinder and the second end rubber cylinder.

[0014] In some embodiments of the present application, in the setting state, the central tube extends in a vertical direction, and the setting mechanism, the rubber cylinder and the suspension mechanism are arranged from top to bottom.

[0015] In some embodiments of the present application, the air-tight suspension seal is also provided with a locking mechanism, which includes a locking seat and a locking ring that are connected to each other, the locking seat sleeve is arranged outside the center tube and is located between the sealing mechanism and the rubber tube, the locking ring is arranged between the locking seat and the center tube, and the locking ring and the center tube are both provided with serrated grooves; in the sealing state, the serrated groove of the locking ring and the serrated groove of the center tube are engaged with each other to prevent the rubber tube from rebounding to the side where the sealing mechanism is located.

[0016] It can be seen from the above technical solutions that the embodiments of the present invention have at least the following advantages and positive effects:

[0017] In the air-tight suspension packer of the embodiment of the present invention, the center tube serves as the basis of the overall structure, and the sealing mechanism serves as the driving source. During the sealing, the sealing mechanism provides a sealing force to drive the first cava cone to move along the axial direction of the center tube toward the direction close to the cava seat. As the first cava cone continues to move, the first cava cone begins to contact the cava seat and pushes the cava seat to move toward the direction close to the second cava cone. During this movement process, the first cava cone and the first cava as well as the second cava cone and the second cava approach and cooperate with each other. Each cava is radially stretched outward by the corresponding cava cone and fits tightly with the inner wall of the casing. Relying on the friction and bite force generated between each cava and the inner wall of the casing, the first cava and the second cava can be firmly anchored to the inner wall of the casing and generate a bidirectional anchoring force. This bidirectional structure can effectively resist external forces from different directions, thereby improving the stability and reliability of the sealing of the air-tight suspension packer. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Various objects, features and advantages of the present invention will become more apparent by considering the following detailed description of preferred embodiments of the present invention in conjunction with the accompanying drawings. The accompanying drawings are merely exemplary illustrations of the present invention and are not necessarily drawn to scale. In the accompanying drawings, the same reference numerals always represent the same or similar parts.

[0019] in:

[0020] Figure 1 is a schematic structural diagram of an airtight suspension packer according to an exemplary embodiment.

[0021] Figure 2 yes Figure 1 sectional view of .

[0022] Figure 3 yes Figure 1 Schematic diagram of the decomposition structure.

[0023] Figure 4 yes Figure 2 Schematic diagram of the enlarged structure of area A in the middle.

[0024] Figure 5 yes Figure 2 Schematic diagram of the enlarged structure of area B in the middle

[0025] The following are the descriptions of the reference numerals:

[0026] 1. Center tube; 11. Guide hole; 12. Pressure transmission hole;

[0027] 2. Suspension mechanism; 21. First slip cone; 211. Main body; 2111. Positioning hole; 212. Connecting part; 2121. Limiting strip; 213. Conical plate; 22. Slip seat; 23. Second slip cone; 24. First slip; 241. Matching strip; 25. Second slip; 26. Sleeve;

[0028] 3. Setting mechanism; 31. Hydraulic cylinder; 32. Connecting sleeve; 33. Hydraulic chamber;

[0029] 4. Guide column;

[0030] 5. Rubber cylinder; 51. First metal shoulder guard; 52. First end rubber cylinder; 53. First main rubber cylinder; 54. Second main rubber cylinder; 55. Second end rubber cylinder; 56. Second metal shoulder guard; 57. Spacer ring;

[0031] 6. Locking mechanism; 61. Locking seat; 62. Locking ring;

[0032] 7. Casing. DETAILED DESCRIPTION

[0033] Although the present invention can be easily embodied in different forms of embodiments, only some of the specific embodiments are shown in the drawings and will be described in detail in this specification. It should be understood that this description should be regarded as an exemplary illustration of the principles of the invention and is not intended to limit the invention to that described herein.

[0034] Thus, a feature indicated in this specification will be used to illustrate one of the features of an embodiment of the present invention, rather than implying that each embodiment of the present invention must have the described feature. In addition, it should be noted that this specification describes many features. Although some features can be combined together to illustrate possible system designs, these features can also be used in other combinations that are not explicitly described. Thus, unless otherwise stated, the described combinations are not intended to be limiting.

[0035] In the embodiments shown in the drawings, the indications of directions (such as up, down, left, right, front and back) used to explain the structure and movement of various elements of the present invention are not absolute but relative. These descriptions are appropriate when these elements are in the positions shown in the drawings. If the description of the positions of these elements changes, the indications of these directions also change accordingly.

[0036] See also Figures 1 to 3 The airtight suspension packer provided in one embodiment of the present invention mainly comprises a central pipe 1, a suspension mechanism 2 and a setting mechanism 3. The suspension mechanism 2 comprises a first slip cone 21, a slip seat 22 and a second slip cone 23 which are arranged on the central pipe 1 in sequence along the axial direction. The slip seat 22 is provided with a first slip 24 and a second slip 25 which correspond to the first slip cone 21 and the second slip cone 23 respectively. The setting mechanism 3 is arranged on the central pipe 1, and the setting mechanism 3 is used to provide a setting force to the first slip cone 21. The airtight suspension packer has a setting state and an unsetting state. In the setting state, the setting force drives the first slip cone 21 to move to the side close to the slip seat 22, the first slip cone 21 pushes the slip seat 22 close to the second slip cone 23, and the first slip 24 and the second slip 25 are respectively opened by the first slip cone 21 and the second slip cone 23 and anchored on the inner wall of the casing 7.

[0037] In the airtight suspension packer of the embodiment of the present invention, the central pipe 1 serves as the basis of the overall structure, and the sealing mechanism 3 serves as the driving source. When the sealing is performed, the sealing mechanism 3 provides a sealing force to drive the first slip cone 21 to move along the axial direction of the central pipe 1 toward the direction close to the slip seat 22. As the first slip cone 21 continues to move, the first slip cone 21 begins to contact the slip seat 22 and pushes the slip seat 22 to move toward the direction close to the second slip cone 23. During this movement, the first slip cone 21 and the first slip cone 21 are in contact with each other. The slip 24 and the second slip cone 23 and the second slip 25 are close to each other and cooperate with each other. Each slip is radially expanded outward by the corresponding slip cone and fits tightly with the inner wall of the casing 7. Relying on the friction and bite force generated between each slip and the inner wall of the casing 7, the first slip 24 and the second slip 25 can be firmly anchored on the inner wall of the casing 7 and generate a bidirectional anchoring force. This bidirectional structure can effectively resist external forces from different directions, thereby improving the stability and reliability of the air-tight suspension packer.

[0038] Please note that Figure 1 , Figure 1 The airtight suspension packer is in an initial state. When it is not set, the setting mechanism 3 does not provide a setting force. The airtight suspension packer is in an initial state. Each component remains stationary, and there is a gap between the first slip 24 and the second slip 25 and the inner wall of the casing 7.

[0039] It can be imagined that when the second cava 25 is expanded and anchored on the inner wall of the sleeve 7 by the second cava cone 23, the cava seat 22 can be moved to abut against the second cava cone 23, or there can still be a gap between the cava seat 22 and the second cava cone 23. In this embodiment, the positional relationship between the cava seat 22 and the second cava cone 23 is the former, and the second cava cone 23 can provide limiting and support for the cava seat 22, so that the overall structure is more stable.

[0040] In a specific embodiment, the suspension mechanism 2 further includes a sleeve 26 sleeved outside the central tube 1, the sleeve 26 is fixedly connected to the slip seat 22, and is respectively connected to the first slip cone 21 and the second slip cone 23 by pins, and the second slip cone 23 is fixedly connected to the central tube 1. Specifically, the sealing force driving the first slip cone 21 to move shears the pins between the first slip cone 21 and the sleeve 26, and enables the first slip cone 21 to move toward the side close to the slip seat 22, and the force of the first slip cone 21 pushing the slip seat 22 causes the pins between the sleeve 26 connected thereto and the second slip cone 23 to be sheared, so that the slip seat 22 can move along the side close to the second cone, and the second slip cone 23 serves as a fixed foundation therein, and the design of each pin makes the sealing process controllable, and before the sealing force does not reach the shear strength of the pin, the relative positions of each component are fixed, avoiding premature sealing due to accidental force, thereby improving the accuracy and reliability of the sealing.

[0041] See also Figure 1 and Figure 3 In a specific embodiment, the first slip cone 21 includes a main body 211 sleeved outside the central tube 1, a plurality of connecting parts 212 arranged at intervals in the circumferential direction around the main body 211, and a conical plate 213 provided between two adjacent connecting parts 212, the conical plate 213 having a slope and used to prop open the first slip 24. In an unset state, the first slip 24 is positioned between two adjacent connecting parts 212 and is spaced apart from the conical plate 213. In a set state, the first slip 24 is propped outward radially by the conical plate 213 and extends out between two adjacent connecting parts 212.

[0042] In the unsealed state, the two adjacent connecting parts 212 can position the first slip 24, ensuring that the first slip 24 can be kept in a stable position in the unsealed state, so that it can be smoothly moved to the predetermined working position. In the sealed state, as the first slip cone 21 continues to move, the interval between the conical plate 213 and the first slip 24 is continuously reduced until the two are in contact. Since the conical plate 213 has a slope, when the conical plate 213 and the first slip 24 continue to move relative to each other, the slope of the conical plate 213 will generate a radial outward component force on the first slip 24, and make the first slip 24 expand outward in the radial direction, and finally anchored on the inner wall of the casing 7. Therefore, this embodiment provides a practical and effective implementation structure. Through the structural design of the first slip cone 21 and the cooperation with the first slip 24, it is ensured that the first slip 24 and the first slip cone 21 can be applied in different states.

[0043] See also Figure 3In a further embodiment, limiting strips 2121 are provided on opposite sides of the connection part 212, and matching strips 241 are provided on opposite sides of the first slip 24. In the unset state, the matching strips 241 on both sides of the first slip 24 are respectively opposite to the adjacent limiting strips 2121 of the two adjacent connection parts 212 to prevent the first slip 24 from extending between the two adjacent connection parts 212. In the set state, the adjacent limiting strips 2121 of the two adjacent connection parts 212 are misaligned with the matching strips 241 on both sides of the first slip 24. The design of the limit strip 2121 and the matching strip 241 being relative to each other in the unsealed state provides reliable positioning and firm constraint for the first cava 24. The sealing force pushes the first cava cone 21 to move relative to the cava seat 22 and the first cava 24, and after the limit strip 2121 and the matching strip 241 are misaligned, the first cava 24 is expanded under the action of the conical plate 213. This process ensures that the sealing action is accurately triggered according to the design requirements, avoiding the occurrence of incorrect sealing.

[0044] It can be imagined that the number of conical plates 213 and first cava 24 is adapted to the connecting portion 212, and respectively corresponds to the plurality of connecting portions 212 in pairs, and each conical plate 213 and each first cava 24 is arranged at circumferential intervals, so that they can be more firmly fixed on the inner wall of the sleeve 7.

[0045] It should be noted that the specific structure and matching method of the second slip 25 and the second slip cone 23 are designed by referring to the first slip 24 and the first slip cone 21 in the above embodiment, and will not be elaborated here.

[0046] In a specific embodiment, a positioning hole 2111 is provided on the first cava cone 21, and a guide hole 11 which is long and extends axially is provided on the center pipe 1. The airtight suspension packer also includes a guide column 4, which is locked in the positioning hole 2111 and extends into the guide hole 11. The guide hole 11 provides a precise guide path for the movement of the guide column 4, limiting the first cava cone 21 to only move linearly along the axial direction, thereby avoiding circumferential rotation or displacement of the first cava cone 21 during movement, thereby ensuring that the first cava cone 21 and the first cava 24 can be accurately matched, thereby improving the accuracy and stability of the sealing.

[0047] In this embodiment, the connecting portion 212 of the first slip cone 21 and the connecting portion 212 of the second slip cone 23 are respectively connected to the sleeve 26 by pins. The positioning hole 2111 is located on the main body 211 of the first slip cone 21.

[0048] See also Figure 1 , Figure 2 and Figure 5In a specific embodiment, the sealing mechanism 3 includes a hydraulic cylinder 31 and a connecting sleeve 32, and the hydraulic cylinder 31, the connecting sleeve 32 and the center tube 1 enclose a hydraulic chamber 33. The center tube 1 is provided with a pressure transmission hole 12 which is respectively connected to the interior of the center tube 1 and the hydraulic chamber 33. The pressure transmission hole 12, the hydraulic cylinder 31 and the connecting sleeve 32 are arranged in groups to form a power group. The power group is provided with a plurality of groups, and the plurality of power groups are arranged in sequence from the side away from the first slip cone 21 to the side close to the first slip cone 21, and the connecting sleeve 32 of the first group of two adjacent power groups is in contact with the hydraulic cylinder 31 of the rear group, and the connecting sleeve 32 of the tail group power group is used to drive the first slip cone 21. Multiple power groups relay power in sequence, and can generate a larger combined force to drive the first slip cone 21. Compared with a single power source, this mode of multiple groups of power working together greatly enhances the driving force for setting the seal, and can solve the problem of component failure causing failure to set the seal normally when only a single hydraulic cylinder 31 and connecting sleeve 32 are provided, thereby improving the stability and reliability of the overall structure.

[0049] It is conceivable that the connecting sleeve 32 of the first power group and the hydraulic cylinders 31 and connecting sleeves 32 in the remaining groups can be slidably mounted outside the central tube 1 .

[0050] In this embodiment, two groups of pressure transmission holes 12 , a liquid cylinder 31 and a connecting sleeve 32 are provided.

[0051] In a specific embodiment, the airtight suspension packer further includes a rubber tube 5, which is disposed between the setting mechanism 3 and the first slip cone 21, and is slidably sleeved outside the central pipe 1. In the setting state, the setting mechanism 3 drives the rubber tube 5 to move toward the side close to the first slip cone 21 by providing a setting force, and the rubber tube 5 pushes the first slip cone 21, and the rubber tube 5 is squeezed between the setting mechanism 3 and the first slip cone 21, and fits against the inner wall of the casing 7.

[0052] The sealing mechanism 3, the rubber sleeve 5 and the suspension mechanism 2 are designed in sequence. When the sealing mechanism 3 provides the sealing force, the sealing force is transmitted to the first cava cone 21 through the rubber sleeve 5 and is transmitted in the various components of the suspension mechanism 2. In the actual usage scenario, the provided sealing force is sufficient to cut the pins between the first cava cone 21 and the sleeve 26 and between the second cava cone 23 and the sleeve 26, and make the first cava 24 and the second cava 25 respectively open by the first cava cone 21 and the second cava cone 23. In this process, the rubber sleeve 5 plays a role in transmitting the sealing force. Subsequently, the first cava 24 and the second cava 25 complete the anchoring on the inner wall of the casing 7, and the suspension mechanism 2 is fixed as a whole. At this time, the continuously provided sealing force can squeeze the rubber sleeve 5, so that the rubber sleeve 5 is compressed and expanded radially outward. When the rubber sleeve 5 expands, it fits tightly with the inner wall of the casing 7, thereby realizing the sealing function of the airtight suspension packer. Such a structural design, on the one hand, only needs to provide a sealing force in the same direction to achieve the two functions of suspension and sealing, thus simplifying the structure; on the other hand, the suspension mechanism 2 can lock the position of the rubber cylinder 5 from the opposite side of the sealing force, thus ensuring the long-term and reliable sealing.

[0053] Please note that Figure 1 , Figure 1 It is a structural schematic diagram of the airtight suspension packer in the initial state. When it is not set, the setting mechanism 3 does not provide a setting force, the airtight suspension packer is in the initial state, all components remain stationary, and there is a gap between the rubber sleeve 5 and the inner wall of the casing 7.

[0054] See also Figure 1 and Figure 2 In a specific embodiment, the rubber tube 5 includes a first metal shoulder 51, a first end rubber tube 52, a first main rubber tube 53, a second main rubber tube 54, a second end rubber tube 55 and a second metal shoulder 56 which are sequentially sleeved on the central tube 1 along the axial direction, and a spacer ring 57 is provided between the first end rubber tube 52 and the first main rubber tube 53, between the first main rubber tube 53 and the second main rubber tube 54, and between the second main rubber tube 54 and the second end rubber tube 55. Each end rubber tube 5 and each main rubber tube 5 serve as the expandable body of the rubber tube 5, and the spacer ring 57 plays a role in positioning and supporting. Each metal shoulder protects each end rubber tube 5, which can improve the overall long-term pressure resistance and temperature resistance. The structural design of the rubber tube 5 can ensure the sealing performance and stability of the rubber tube 5.

[0055] In this embodiment, the first metal shoulder guard 51 and the second metal shoulder guard 56 are made of nickel-based alloy material, which enhances the corrosion resistance and can be used in acidic and high-temperature conditions containing H2S, CO2, high chloride ion concentration, etc.

[0056] See also Figures 1 to 3In a specific embodiment, in the setting state, the center tube 1 extends in the vertical direction, and the setting mechanism 3, the rubber cylinder 5 and the suspension mechanism 2 are arranged from top to bottom. In this layout, the setting force is directly transmitted downward along the axial direction of the center tube 1, which is consistent with the direction of gravity. Gravity can provide additional assistance to help the rubber cylinder 5 move downward more smoothly and be squeezed to achieve the sealing of the rubber cylinder 5 and the suspension of the suspension mechanism 2, and the path is simple and the energy loss is small. In this embodiment, the center tube 1 has an upper joint and a lower joint, the setting mechanism 3 is arranged near the upper joint, and the suspension mechanism 2 is arranged near the lower joint.

[0057] It should be noted that this layout is only a preferred implementation of the airtight suspension packer in actual application scenarios. Specifically, the airtight suspension packer can be arranged in a variety of different positions and orientations according to specific usage needs.

[0058] See also Figure 1 , Figure 2 and Figure 4 In a specific embodiment, the airtight suspension packer is further provided with a locking mechanism 6, which includes a locking seat 61 and a locking ring 62 connected to each other. The locking seat 61 is sleeved outside the central tube 1 and is located between the setting mechanism 3 and the rubber tube 5. The locking ring 62 is arranged between the locking seat 61 and the central tube 1, and the locking ring 62 and the central tube 1 are both provided with a serrated groove. In the setting state, the serrated groove of the locking ring 62 is engaged with the serrated groove of the central tube 1 to prevent the rubber tube 5 from rebounding to the side where the setting mechanism 3 is located.

[0059] The engagement of the serrated grooves of the locking ring 62 and the serrated grooves of the center tube 1 provides reliable mechanical locking for the rubber sleeve 5, effectively preventing the rubber sleeve 5 from rebounding due to reverse force, thereby ensuring that the packer always maintains a good sealing and suspension state, and improving the stability and reliability in the setting state.

[0060] It should be noted that since the airtight suspension seal provided by the present invention can provide two-way anchoring, has a large sealing force and can provide a stable locking effect from both ends of the rubber tube 5, it can ensure its suspension and sealing effects, and can be used in scenarios where it is necessary to suspend and seal a small casing with a large radial dimension in a large casing.

[0061] Although the present invention has been described with reference to several typical embodiments, it should be understood that the terms used are illustrative and exemplary, rather than restrictive. Since the present invention can be embodied in a variety of forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims, so all changes and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. An airtight suspension packer, characterized in that: include: Central tube; The suspension mechanism comprises a first slip cone, a slip seat and a second slip cone which are sequentially arranged on the central tube in an axial direction and spaced apart from each other, wherein the slip seat is provided with a first slip and a second slip which correspond to the first slip cone and the second slip cone respectively; A sealing mechanism, disposed on the central tube, and used for providing a sealing force to the first slip cone; The airtight suspension packer has a set state and an unset state; Wherein, in the sealing state, the sealing force drives the first cava cone to move toward the side close to the cava seat, the first cava cone pushes the cava seat close to the second cava cone, and the first cava and the second cava are respectively spread open by the first cava cone and the second cava cone and anchored on the inner wall of the casing.

2. The airtight suspension packer according to claim 1, characterized in that: The suspension mechanism also includes a sleeve sleeved outside the central tube, the sleeve is fixedly connected to the slip seat, and is respectively connected to the first slip cone and the second slip cone through pins, and the second slip cone is fixedly connected to the central tube.

3. The airtight suspension packer according to claim 2, characterized in that: The first slip cone includes a main body sleeved outside the central tube, a plurality of connecting parts arranged circumferentially around the main body, and a conical plate arranged between two adjacent connecting parts, wherein the conical plate has a slope and is used to prop open the first slip; In the unset state, the first slip is positioned between two adjacent connecting portions and is spaced apart from the conical plate; In the setting state, the first slip is spread radially outward by the conical plate and extends out between two adjacent connecting portions.

4. The airtight suspension packer according to claim 3, characterized in that: Limiting strips are provided on opposite sides of the connecting portion, and matching strips are provided on opposite sides of the first slip; In the unset state, the matching strips on both sides of the first slip are respectively opposite to the adjacent two limiting strips of the adjacent two connecting parts to prevent the first slip from extending between the adjacent two connecting parts; In the setting state, the two adjacent limiting strips of the two adjacent connecting parts are misaligned with the matching strips on both sides of the first slip.

5. The airtight suspension packer according to claim 2, characterized in that: The first slip cone is provided with a positioning hole, the central tube is provided with a long strip-shaped guide hole extending axially, and the airtight suspension packer also includes a guide column, which is locked in the positioning hole and extends into the guide hole.

6. The airtight suspension packer according to claim 1, characterized in that: The setting mechanism comprises a hydraulic cylinder and a connecting sleeve, wherein the hydraulic cylinder, the connecting sleeve and the central tube enclose a hydraulic chamber; The central tube is provided with pressure transmission holes respectively communicating with the interior of the central tube and the hydraulic chamber; The pressure transmission hole, the liquid cylinder and the connecting sleeve are arranged in groups to form a power group. The power group is provided with several groups. The several groups of power groups are arranged in sequence from the side away from the first cava cone to the side close to the first cava cone, and the connecting sleeve of the first group of two adjacent power groups is abutted against the liquid cylinder of the rear group, and the connecting sleeve of the power group of the rear group is used to drive the first cava cone.

7. The airtight suspension packer according to claim 1, characterized in that: It also includes a rubber cylinder, which is arranged between the setting mechanism and the first slip cone and is slidably sleeved outside the central tube; In the setting state, the setting mechanism drives the rubber cartridge to move toward the first slip cone by providing a setting force, and makes the rubber cartridge push against the first slip cone, and the rubber cartridge is squeezed between the setting mechanism and the first slip cone, and fits against the inner wall of the casing.

8. The airtight suspension packer according to claim 7, characterized in that: The rubber cylinder includes a first metal shoulder guard, a first end rubber cylinder, a first main rubber cylinder, a second main rubber cylinder, a second end rubber cylinder and a second metal shoulder guard which are sequentially axially sleeved on the central tube, and spacer rings are provided between the first end rubber cylinder and the first main rubber cylinder, between the first main rubber cylinder and the second main rubber cylinder, and between the second main rubber cylinder and the second end rubber cylinder.

9. The airtight suspension packer according to claim 7, characterized in that: In the setting state, the central tube extends in the vertical direction, and the setting mechanism, the rubber cylinder and the suspension mechanism are arranged from top to bottom.

10. The airtight suspension packer according to claim 7, characterized in that: A locking mechanism is also provided, the locking mechanism comprising a locking seat and a locking ring connected to each other, the locking seat sleeve is arranged outside the central tube and is located between the setting mechanism and the rubber cylinder, the locking ring is arranged between the locking seat and the central tube, and the locking ring and the central tube are both provided with a serrated groove; In the setting state, the serrated groove of the lock ring and the serrated groove of the center tube are engaged with each other to prevent the rubber sleeve from rebounding to the side where the setting mechanism is located.

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