Hanger ball seat structure and hanger

Abstract

The invention relates to the technical field of oil exploration, in particular to a hanger ball seat structure and a hanger. The hanger ball seat structure comprises a central pipe, an external assembly, a ball seat, a seat hanging part and a reset part; the ball seat, the external assembly and the central pipe are communicated to jointly form a main flow channel, and a bypass flow channel is arranged between the ball seat and the external assembly; the sitting hanging ball divides the main path runner into a first main path sub-runner and a second main path sub-runner; in the pressing state, external pressure drives the ball seat to move in the direction away from the center pipe, so that the first main path sub-runner is not communicated with the second main path sub-runner. And in the pressure relief state, the reset piece drives the ball seat to move in the direction close to the center pipe, so that the first main path sub-runner and the second main path sub-runner are communicated through the bypass runner. According to the technical scheme disclosed by the invention, after the hanger is hydraulically released, the pressure above the ball body is equal to the pressure below the ball body, so that the formation of a hydraulic lock is effectively avoided, and the pulling-out difficulty and the pulling-out risk are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of oil exploration, and particularly to a hanger ball seat structure and a hanger. Background Art

[0002] With the continuous deepening of oil and gas resource development, the application of hangers has become more and more extensive. In technical fields such as profile control and water shutoff, staged fracturing, and layered oil production, hangers are required for hanging the lower completion string and realizing the oil and gas resource exploitation operation as the later production string.

[0003] The ball seat structure is one of the important components of the hanger. The ball seat structure includes a ball seat and a ball. The hanger forms a pressure buildup in the pipe by dropping a ball into the ball seat into the pipe, starts the setting driving mechanism, and pushes the slips to achieve setting. After the hydraulic release of the hanger, it is easy to have a situation where the pressure above the ball is greater than the pressure below the ball, forming a hydraulic lock, resulting in an increase in the hook load during tripping, causing the user to misjudge that the release has not occurred, and then using a hydraulic pressure higher than the release pressure to damage the ball seat, making the pressure above the ball equal to the pressure below the ball and releasing the hydraulic lock. However, such a method not only increases the operation difficulty of tripping but also increases the tripping risk. Summary of the Invention

[0004] An embodiment of the present invention provides a hanger ball seat structure and a hanger, which can make the pressure above the ball equal to the pressure below the ball after the hydraulic release of the hanger, thereby effectively avoiding the formation of a hydraulic lock and reducing the tripping difficulty and tripping risk.

[0005] In a first aspect, an embodiment of the present invention provides a hanger ball seat structure, including:

[0006] A central pipe;

[0007] An external component, coaxially arranged with the central pipe, the external component sleeved at one end of the central pipe and connected to the central pipe;

[0008] A ball seat, movably arranged in the external component, the ball seat, the external component and the central pipe being connected and communicating to jointly form a main flow channel, and a bypass flow channel being arranged between the ball seat and the external component;

[0009] A setting ball, arranged in the ball seat to divide the main flow channel into a first main flow shunt channel and a second main flow shunt channel; and

[0010] A reset member, arranged in the bypass flow channel;

[0011] Among them, in the pressure application state, the external pressure drives the ball seat to move away from the central tube, so as to block the bypass flow channel, and the first main path shunt channel is not communicated with the second main path shunt channel; in the pressure relief state, the reset member drives the ball seat to move towards the central tube, so as to make the bypass flow channel unblocked, and the first main path shunt channel is communicated with the second main path shunt channel through the bypass flow channel.

[0012] In one embodiment, the external component includes:

[0013] A reset seat; and

[0014] A sleeve portion, including a first end and a second end oppositely arranged in the axial direction of the central tube, the first end is sleeved on one end of the central tube and connected to the central tube, and the second end is sleeved on one end of the reset seat and connected to the reset seat;

[0015] Among them, in the pressure application state, the external pressure drives the ball seat to move away from the central tube, so that the ball seat abuts against the end face of the reset seat to block the bypass flow channel; in the pressure relief state, the ball seat is driven to move towards the central tube, so that there is a distance between the ball seat and the reset seat in the axial direction of the central tube, and the bypass flow channel is unblocked.

[0016] In one embodiment, the ball seat includes:

[0017] A main body section, which is inserted into the reset seat, and an over-flow hole penetrating the main body section in the radial direction of the main body section is provided on the main body section; and

[0018] A support section, connected to one end of the main body section close to the central tube, the support section is located between the reset seat and the central tube, and the outer diameter of the support section is larger than the outer diameter of the main body section to form a ball seat step surface.

[0019] In one embodiment, the bypass flow channel includes:

[0020] A first bypass shunt channel, arranged between the reset seat and the main body section, and the first bypass shunt channel is communicated with the first main path shunt channel through the over-flow hole; and

[0021] A second bypass shunt channel, arranged between the sleeve portion and the support section, and the second bypass shunt channel is communicated with the second main path shunt channel;

[0022] Wherein, in the pressure application state, the external pressure drives the ball seat to move away from the central tube, so that the stepped surface of the ball seat abuts against the reset seat, and the first bypass shunt channel is not communicated with the second bypass shunt channel; in the pressure relief state, the reset member drives the ball seat to move towards the central tube, and there is a spacing between the stepped surface of the ball seat and the reset seat in the axial direction of the central tube, and the first bypass shunt channel is communicated with the second bypass shunt channel.

[0023] In one embodiment, the reset seat includes:

[0024] A reset cylinder, on the inner wall of which a limiting stepped surface is provided, and a limiting groove is provided at one end of the reset cylinder close to the central tube; and

[0025] A seal, arranged in the limiting groove.

[0026] In one embodiment, the reset member is sleeved outside the main body section, one end of the reset member abuts against the stepped surface of the ball seat, and the other end abuts against the limiting stepped surface.

[0027] In one embodiment, the sleeve part includes:

[0028] A limiting sleeve, threadedly connected to the central tube;

[0029] A sealing sleeve, threadedly connected to the reset seat, and there is a preset distance between the sealing sleeve and the limiting sleeve in the axial direction of the central tube; and

[0030] A rotating sleeve, sleeved outside the limiting sleeve and the sealing sleeve, and the rotating sleeve is threadedly connected to one end of the sealing sleeve.

[0031] In one embodiment, there is a first annular spacing between the main body section and the reset seat to form the first bypass shunt channel; there is a second annular spacing between the support section and the sealing sleeve to form the second bypass shunt channel.

[0032] In one embodiment, a support hole is provided in the support section, the aperture of the support hole gradually decreases along the axial direction, and the aperture of the support hole at one end close to the central tube is larger than the aperture of the support hole at the end far from the central tube;

[0033] Wherein, the setting ball abuts against the pore wall of the support hole.

[0034] In a second aspect, an embodiment of the present invention provides a hanger, including the hanger ball seat structure according to any one of the embodiments in the first aspect.

[0035] Compared with the prior art, in the embodiment of the present invention, by providing a bypass flow channel, a structural basis is provided for the first main path shunt channel and the second main path shunt channel to be connected in a pressure relief state, so that the first main path shunt channel and the second main path shunt channel are connected in the pressure relief state, and the pressures of the first main path shunt channel and the second main path shunt channel are equal, thereby preventing the occurrence of liquid lock phenomenon when the central pipe is lifted after releasing the connection, effectively avoiding the increase of the hook load during drilling out, avoiding the situation of misjudging the release by the user, ensuring smooth drilling out, and reducing the difficulty and risk of drilling out. By providing a ball seat that can move under the action of external pressure and a reset member to control the on-off of the bypass flow channel. In the pressure application state, the bypass flow channel is controlled to be blocked and disconnected, so that the second main path shunt channel becomes a sealed cavity, and normal pressure can be built up to realize the setting and sealing of the hanger; in the pressure relief state, the bypass flow channel is controlled to be unobstructed, so that the first main path shunt channel and the second main path shunt channel are connected, and the pressures of the first main path shunt channel and the second main path shunt channel are equal, which can effectively avoid the formation of liquid lock, making it easy to judge the release. After the hanger releases the connection and relieves pressure, the pipe string can be directly drilled out without having to break the ball seat, ensuring that the pipe string for setting and sealing can be smoothly withdrawn after the hanger releases the connection, and it can be widely used for the setting and release of hangers in various well types such as vertical wells, directional wells, and horizontal wells. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The present invention will be described in more detail below based on embodiments with reference to the drawings.

[0037] Figure 1 is a schematic structural diagram of the hanger ball seat structure provided by an embodiment of the present invention in a pressure relief state;

[0038] Figure 2 is Figure 1 a schematic structural diagram of the hanger ball seat structure provided by the embodiment in a pressure application state.

[0039] REFERENCE SIGNS:

[0040] 10, central pipe;

[0041] 20, external component; 210, reset seat; 2101, reset cylinder; 2102, seal; 220, sleeve part; 2201, limit sleeve; 2202, seal sleeve; 2203, rotating sleeve;

[0042] 30, ball seat; 310, main body section; 320, support section; 3201, support hole; 330, flow-through hole; 340, ball seat step surface;

[0043] 40, setting ball;

[0044] 50, reset member;

[0045] 60, main flow channel; 610, first main path shunt channel; 620, second main path shunt channel;

[0046] 70. Bypass flow path; 710. First bypass shunt flow path; 720. Second bypass shunt flow path. Detailed implementation manner

[0047] The present invention will be further described below in conjunction with the accompanying drawings.

[0048] With the continuous deepening of oil and gas resource development, the application of hangers has become more and more extensive. In technical fields such as profile control and water shutoff, staged fracturing, and layered oil production, hangers are required to suspend the lower completion string and realize the oil and gas resource exploitation operation as the later production string.

[0049] The ball seat structure is one of the important components of the hanger. The ball seat structure includes a ball seat and a ball. The hanger forms a pressure buildup in the pipe by dropping a ball into the ball seat into the pipe, starts the setting drive mechanism, and pushes the slips to achieve setting. After the hydraulic release of the hanger, when the lower part of the ball is a sealed cavity, it is easy to have a situation where the pressure above the ball is greater than the pressure below the ball, forming a liquid lock, resulting in an increase in the hook load during tripping, causing the user to misjudge that the release has not occurred, and then using a hydraulic pressure higher than the release pressure to damage the ball seat, making the pressure above the ball consistent with the pressure below the ball to release the liquid lock. However, such a method not only increases the operation difficulty of tripping but also increases the tripping risk.

[0050] In the first aspect, in view of the above technical problems, as Figure 1 , Figure 2 shown, this embodiment provides a ball seat 30 structure of a hanger, including a central tube 10, an external component 20, a ball seat 30, a setting ball 40, and a reset member 50; the external component 20 is coaxially arranged with the central tube 10, the external component 20 is sleeved at one end of the central tube 10 and connected to the central tube 10; the ball seat 30 is movably arranged in the external component 20, the ball seat 30, the external component 20, and the central tube 10 are connected and communicated to jointly form a main flow path 60, and a bypass flow path 70 is arranged between the ball seat 30 and the external component 20; the setting ball 40 is arranged in the ball seat 30 to divide the main flow path into a first main shunt flow path 610 and a second main shunt flow path 620; the reset member 50 is arranged in the bypass flow path 70;

[0051] Wherein, in the pressure application state, the external pressure drives the ball seat 30 to move away from the central tube 10 to block the bypass flow path 70, and the first main shunt flow path 610 and the second main shunt flow path 620 are not communicated; in the pressure relief state, the reset member 50 drives the ball seat 30 to move towards the central tube 10 to make the bypass flow path 70 unblocked, and the first main shunt flow path 610 and the second main shunt flow path 620 are connected and communicated through the bypass flow path 70.

[0052] As can be seen from the above, by setting the bypass flow channel 70, a structural basis is provided for the first main path shunt channel 610 and the second main path shunt channel 620 to be connected in the pressure relief state, enabling the first main path shunt channel 610 and the second main path shunt channel 620 to be connected in the pressure relief state, so that the pressures of the first main path shunt channel 610 and the second main path shunt channel 620 are equal. Thus, the phenomenon of liquid lock is prevented when the central pipe 10 is lifted after releasing the grip, effectively avoiding the increase in the hook load during drilling out, avoiding the situation where the user misjudges the release of the grip, ensuring smooth drilling out, and reducing the difficulty and risk of drilling out. By setting the ball seat 30, it can move under the action of external pressure and the reset member 50 to control the on-off of the bypass flow channel 70. In the pressure application state, the bypass flow channel 70 is controlled to be blocked and disconnected, making the second main path shunt channel 620 a sealed cavity, capable of normal pressure buildup, realizing the setting and sealing of the hanger; in the pressure relief state, the bypass flow channel 70 is controlled to be unobstructed, enabling the first main path shunt channel 610 and the second main path shunt channel 620 to be connected, and the pressures of the first main path shunt channel 610 and the second main path shunt channel 620 are equal, effectively avoiding the formation of liquid lock, being easy to judge the release of the grip. After the hanger releases the grip and relieves pressure, it can be directly drilled out without having to knock out the ball seat, ensuring that the running and setting string can be smoothly lifted out after the hanger releases the grip, and it can be widely used for the setting and release of hangers in various well types such as vertical wells, directional wells, and horizontal wells.

[0053] It should be noted that the reset member 50 is elastic, deforms under the action of external force, and returns to its original state after the external force is removed. For example, the reset member 50 is a spring. In the pressure application state, the external pressure drives the ball seat 30 to move away from the central pipe 10, and the reset member 50 undergoes compressive deformation under the action of the external pressure; in the pressure relief state, the external pressure is removed, and the elastic force of the reset member 50 drives the ball seat 30 to move towards the central pipe 10.

[0054] It should also be noted that in the pressure application state, that is, when the hanger reaches the preset position in the well, the setting ball 40 is dropped into the central pipe 10. The setting ball 40 is stuck in the ball seat 30, and the drilling fluid flows into the central pipe 10. The hydraulic pressure in the second main path shunt channel 620 continuously increases, forming pressure buildup in the pipe, realizing the setting and sealing of the hanger;

[0055] In the pressure relief state, that is, after the setting is completed, the pump pressure is increased to the hanger release pressure value, the hanger releases the grip hydraulically, and the pressure in the drill string is relieved.

[0056] It should also be noted that before the setting ball 40 is dropped, the first main path shunt channel 610 and the second main path shunt channel 620 are connected, and the bypass flow channel 70 is unobstructed.

[0057] It should also be noted that the external pressure comes from the pressure of the drilling fluid added to the central pipe 10.

[0058] Such as Figure 1 、 Figure 2As shown, in some embodiments, the external component 20 includes a reset seat 210 and a sleeve portion 220; the sleeve portion 220 includes a first end and a second end that are oppositely arranged in the axial direction of the central tube 10. The first end is sleeved on one end of the central tube 10 and is connected to one end of the central tube 10. The second end is sleeved on one end of the reset seat 210 and is connected to the reset seat 210.

[0059] Among them, in the pressure application state, the external pressure drives the ball seat 30 to move away from the central tube 10, so that the ball seat 30 abuts against the end face of the reset seat 210 to block the bypass flow channel 70; in the pressure relief state, the ball seat 30 is driven to move closer to the central tube 10, so that there is a spacing between the ball seat 30 and the reset seat 210 in the axial direction of the central tube 10, and the bypass flow channel 70 is unblocked.

[0060] By providing the reset seat 210, a structural basis is provided for controlling the on-off of the bypass flow channel 70; when the ball seat 30 abuts against the reset seat 210, the bypass flow channel 70 is blocked, and the first main path shunt channel 610 is not connected to the second main path shunt channel 620. When there is a spacing between the ball seat 30 and the reset seat 210 in the axial direction of the central tube 10, the ball seat 30 and the reset seat 210 are relatively separated, the bypass flow channel 70 is unblocked, and the first main path shunt channel 610 is connected to the second main path shunt channel 620.

[0061] It should be noted that, as Figure 1 、 Figure 2 shown, the axial direction of the central tube 10 is parallel to the Z direction.

[0062] As Figure 1 、 Figure 2 shown, in some embodiments, the ball seat 30 includes a main body section 310 and a support section 320; the main body section 310 passes through the reset seat 210, and a flow-through hole 330 that penetrates the main body section 310 in the radial direction of the main body section 310 is provided on the main body section 310; the support section 320 is connected to one end of the main body section 310 close to the central tube 10, the support section 320 is located between the reset seat 210 and the central tube 10, and the outer diameter of the support section 320 is greater than the outer diameter of the main body section 310 to form a ball seat step surface 340.

[0063] By providing the flow-through hole 330, a structural basis is provided for the connection between the first main path shunt channel 610 and the second main path shunt channel 620, avoiding the first bypass shunt channel becoming a sealed cavity during the pressure application state, and also avoiding that in the pressure relief state, the bypass flow channel 70 is only connected to the second main path shunt channel 620, resulting in inconsistent hydraulic pressure in the second main path shunt channel 620 and the first main path shunt channel 610, causing a liquid lock phenomenon when the central tube 10 is lifted after releasing the grip. By providing the ball seat step surface 340, a structural basis is provided for blocking the bypass flow channel 70.

[0064] It should be noted that a ball seat 30 hole is provided at one end of the main body section 310 away from the support section 320, and the ball seat 30 hole extends to communicate with the support hole 3201; the flow hole 330 communicates with the ball seat 30 hole.

[0065] It should also be noted that a first hole section is provided at one end of the reset seat 210 away from the central tube 10, and a second hole section is provided at one end of the reset seat 210 close to the central tube 10. The second hole section communicates with the first hole section for the main body section 310 to pass through; and the first hole section cooperates with the main body section 310 to guide the movement of the shaft seat in the axial direction of the central tube 10.

[0066] It should further be noted that the inner diameter of the reset seat 210 is smaller than the inner diameter of the sleeve part, so that the support section 320 can abut against the reset seat 210, providing a structural basis for blocking the bypass flow channel 70.

[0067] Such as Figure 1 、 Figure 2 As shown, in some embodiments, the bypass flow channel 70 includes a first bypass shunt channel and a second bypass shunt channel 720; the first bypass shunt channel is provided between the reset seat 210 and the main body section 310, and the first bypass shunt channel communicates with the first main path shunt channel 610 through the flow hole 330; the second bypass shunt channel 720 is provided between the sleeve part 220 and the support section 320, and the second bypass shunt channel 720 communicates with the second main path shunt channel 620;

[0068] Among them, in the pressure application state, the external pressure drives the ball seat 30 to move away from the central tube 10, so that the ball seat step surface 340 abuts against the reset seat 210, and the first bypass shunt channel is not communicated with the second bypass shunt channel 720; in the pressure relief state, the reset member 50 drives the ball seat 30 to move towards the central tube 10, and there is a distance between the ball seat step surface 340 and the reset seat 210 in the axial direction of the central tube, and the first bypass shunt channel is communicated with the second bypass shunt channel 720.

[0069] By providing the first bypass shunt channel between the reset seat 210 and the main body section 310 and the second bypass shunt channel 720 between the sleeve part 220 and the support section 320, the end surface of the reset seat 210 close to the central tube 10 is located between the first bypass shunt channel and the second bypass shunt channel 720. Thus, the end surface of the reset seat 210 close to the central tube 10 cooperates with the movement of the ball seat 30 to control the on-off of the first bypass shunt channel and the second bypass shunt channel 720. In addition, the first bypass shunt channel provides an installation space for the reset member 50.

[0070] Such as Figure 1 、 Figure 2As shown, in some embodiments, the reset seat 210 includes a reset cylinder 2101 and a seal 2102; a limiting step surface is provided on the inner wall of the reset cylinder 2101, and a limiting groove is provided at one end of the reset cylinder 2101 close to the central tube 10; the seal 2102 is arranged in the limiting groove.

[0071] By providing the limiting step surface, a structural basis is provided for the installation of the reset member 50; by providing the seal 2102, the gap when the ball seat 30 abuts against the end surface of the reset seat 210 is avoided, so as to improve the sealing performance, prevent the first bypass shunt channel from communicating with the second bypass shunt channel 720, make the second main path shunt channel 620 a sealed cavity, complete the pressure buildup in the pipe, and realize the setting and sealing of the hanger.

[0072] It should be noted that the seal 2102 includes but is not limited to a sealing ring. For example, the seal 2102 is a rubber sealing ring.

[0073] It should also be noted that when the setting ball 40 is not inserted, the support section 320 is relatively separated from the reset seat 210. The distance between the ball seat step surface 340 and the seal 2102 in the axial direction of the central tube 10 is L1, and the distance between the ball seat step surface 340 and the reset cylinder 2101 in the axial direction of the central tube 10 is L2, and L1 < L2. Thus, when the ball seat 30 moves under the action of external pressure, the ball seat step surface 340 abuts against the seal 2102 first, so as to ensure the sealing effect.

[0074] As Figure 1 、 Figure 2 As shown, in some embodiments, the reset member 50 is sleeved outside the main body section 310. One end of the reset member 50 abuts against the ball seat step surface 340, and the other end abuts against the limiting step surface.

[0075] By providing that the two ends of the reset member 50 abut against the ball seat step surface 340 and the limiting step surface respectively, one end of the reset member 50 moves along with the movement of the ball seat 30, so that the reset member 50 undergoes elastic deformation and generates an elastic force to provide a driving source for the reset of the ball seat 30.

[0076] As Figure 1 、 Figure 2 As shown, in some embodiments, the sleeve portion 220 includes a limiting sleeve 2201, a sealing sleeve 2202 and a rotating sleeve 2203; the limiting sleeve 2201 is threadedly connected to the central tube 10; the sealing sleeve 2202 is threadedly connected to the reset seat 210, and there is a preset distance between the sealing sleeve 2202 and the limiting sleeve 2201 in the axial direction of the central tube 10; the rotating sleeve 2203 is sleeved outside the limiting sleeve 2201 and the sealing sleeve 2202, and the rotating sleeve 2203 is threadedly connected to one end of the sealing sleeve 2202.

[0077] The rotating sleeve 2203 is threadedly connected to the sealing sleeve 2202, and the limiting sleeve 2201 is threadedly connected to the central tube 10, so that the sealing sleeve 2202 is not directly connected to the central tube 10 and can rotate relative to each other.

[0078] It should be noted that a sealing step surface is provided on the outer wall of the reset cylinder 2101, and the sealing step surface abuts against one end of the sealing sleeve 2202; an outer step surface is provided on the outer wall of the sealing sleeve 2202, and one end of the rotating sleeve 2203 abuts against the outer step surface; an inner step surface is provided on the inner wall of the rotating sleeve 2203, and the sealing sleeve 2202 abuts against the inner step surface; a positioning step surface is also provided on the inner wall of the rotating sleeve 2203, and one end of the limiting sleeve 2201 abuts against the positioning step surface; an auxiliary step surface is provided on the inner wall of the limiting sleeve 2201, and one end of the central tube 10 abuts against the auxiliary step surface. By providing the step surfaces, the installation and positioning of each component are facilitated.

[0079] It should also be noted that the preset distance is set according to actual design requirements. By setting the preset distance, the sealing sleeve 2202 and the limiting sleeve 2201 are relatively separated, ensuring that the sealing sleeve 2202 and the central tube 10 can rotate relative to each other.

[0080] Such as Figure 1 、 Figure 2 As shown in the figure, in some embodiments, there is a first annular spacing between the main body section 310 and the reset seat 210 to form a first bypass shunt channel; there is a second annular spacing between the support section 320 and the sealing sleeve 2202 to form a second bypass shunt channel 720.

[0081] Such as Figure 1 、 Figure 2 As shown in the figure, in some embodiments, a support hole 3201 is provided in the support section 320, and the aperture of the support hole 3201 gradually decreases in the axial direction. The aperture of the end of the support hole 3201 close to the central tube 10 is larger than the aperture of the end of the support hole 3201 far from the central tube 10; wherein, the setting ball 40 abuts against the hole wall of the support hole 3201.

[0082] It should be noted that the aperture of the end of the support hole 3201 far from the central tube 10 is smaller than the diameter of the setting ball 40, so as to ensure that the setting ball 40 can be stuck in the support hole 3201.

[0083] Under the pressure suppression state, drilling fluid is added into the central pipe 10. Under the pressure of the drilling fluid, the setting ball 40 and the ball seat 30 are pushed to move away from the central pipe 10. During the movement process, the reset member 50 undergoes compressive deformation to generate elastic force. When the ball seat 30 moves to abut against the reset seat 210, the bypass flow channel 70 is blocked, the first bypass shunt channel 710 is disconnected from the second bypass shunt channel 720, and the first main shunt channel 610 is not communicated with the second main shunt channel 620, so that the second main shunt channel 620 forms a sealed cavity, realizing the setting and sealing of the hanger.

[0084] Under the pressure relief state, the pressure inside the drill string is relieved. The elastic force of the reset member 50 pushes the ball seat 30 to move towards the central pipe. There is a spacing between the ball seat 30 and the reset seat 210 in the axial direction of the central pipe 10. The ball seat 30 is separated from the reset seat 210, the bypass flow channel 70 is unblocked, the first bypass shunt channel 710 is communicated with the second bypass shunt channel 720, and the first main shunt channel 610 is communicated with the second main shunt channel 620, so that the pressures of the first main shunt channel 610 and the second main shunt channel 620 are equal. At this time, the pipe string is slowly lifted.

[0085] In a second aspect, an embodiment of the present invention provides a hanger, including the hanger ball seat structure according to any one of the embodiments in the first aspect.

[0086] It should be noted that the hanger further includes a setting and sealing tool. The specific structure and working principle of the setting and sealing tool are prior art, and the present invention will not elaborate.

[0087] It should also be noted that the hanger ball seat structure is connected to the bottom of the setting and sealing tool. During the process of running in the hole of the pipe string, there is no need to fill the fluid, and reverse circulation can be carried out when circulation is required due to encountering resistance.

[0088] It should be understood that in the description of the present invention, the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more. In the description of the present invention, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but are in contact through additional features therebetween.

[0089] In the description of the present invention, the first feature being "above", "over" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely means that the horizontal height of the first feature is higher than that of the second feature.

[0090] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "mounted", "connected" and "coupled" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0091] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0092] Although the present invention has been described with reference to preferred embodiments, various modifications can be made thereto and components thereof can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A hanger ball seat structure, characterized in that, Comprising: Central tube; External component, coaxially arranged with the central tube, the external component sleeved at one end of the central tube and connected to the central tube; Ball seat, movably arranged in the external component, the ball seat, the external component and the central tube are connected and communicated to jointly form a main flow channel, and a bypass flow channel is arranged between the ball seat and the external component; Sitting and hanging ball, arranged in the ball seat to divide the main flow channel into a first main flow shunt channel and a second main flow shunt channel; And Reset member, arranged in the bypass flow channel; Wherein, in the pressure application state, the external pressure drives the ball seat to move away from the central tube, so that the bypass flow channel is blocked, and the first main flow shunt channel and the second main flow shunt channel are not communicated; In the pressure relief state, the reset member drives the ball seat to move towards the central tube, so that the bypass flow channel is unblocked, and the first main flow shunt channel and the second main flow shunt channel are connected and communicated through the bypass flow channel.

2. The hanger ball seat structure according to claim 1, characterized in that, The external component includes: Reset seat; and Sleeve part, including a first end and a second end oppositely arranged in the axial direction of the central tube, the first end sleeved at one end of the central tube and connected to the central tube, and the second end sleeved at one end of the reset seat and connected to the reset seat; Wherein, in the pressure application state, the external pressure drives the ball seat to move away from the central tube, so that the ball seat abuts against the end face of the reset seat to block the bypass flow channel; in the pressure relief state, the ball seat is driven to move towards the central tube, so that there is a distance between the ball seat and the reset seat in the axial direction of the central tube, and the bypass flow channel is unblocked.

3. The hanger ball seat structure according to claim 2, characterized in that, The ball seat includes: Main body section, passing through the reset seat, and an over-flow hole penetrating the main body section in the radial direction of the main body section is arranged on the main body section; and Support section, connected to one end of the main body section close to the central tube, the support section is located between the reset seat and the central tube, and the outer diameter of the support section is larger than the outer diameter of the main body section to form a ball seat step surface.

4. The hanger ball seat structure according to claim 3, characterized in that, The bypass flow channel includes: First bypass shunt channel, arranged between the reset seat and the main body section, and the first bypass shunt channel is connected and communicated with the first main flow shunt channel through the over-flow hole; and Second bypass shunt channel, arranged between the sleeve part and the support section, and the second bypass shunt channel is connected and communicated with the second main flow shunt channel; Wherein, in the pressure application state, the external pressure drives the ball seat to move away from the central tube, so that the ball seat step surface abuts against the reset seat, and the first bypass shunt channel and the second bypass shunt channel are not communicated; in the pressure relief state, the reset member drives the ball seat to move towards the central tube, and there is a distance between the ball seat step surface and the reset seat in the axial direction of the central tube, and the first bypass shunt channel and the second bypass shunt channel are connected and communicated.

5. The hanger ball seat structure according to claim 4, characterized in that, The reset seat includes: A reset cylinder, on the inner wall of which a limiting step surface is provided, and a limiting groove is provided at one end of the reset cylinder close to the central tube; and A seal, arranged in the limiting groove.

6. The hanger ball seat structure according to claim 5, characterized in that, The reset part is sleeved outside the main body section, one end of the reset part abuts against the ball seat step surface, and the other end abuts against the limiting step surface.

7. The hanger ball seat structure according to any one of claims 4-6, characterized in that, The sleeve part includes: A limiting sleeve, threadedly connected to the central tube; A sealing sleeve, threadedly connected to the reset seat, and there is a preset distance between the sealing sleeve and the limiting sleeve in the axial direction of the central tube; and A rotating sleeve, sleeved outside the limiting sleeve and the sealing sleeve, and the rotating sleeve is threadedly connected to one end of the sealing sleeve.

8. The hanger ball seat structure according to claim 7, wherein, There is a first annular spacing between the main body section and the reset seat to form the first bypass shunt channel; There is a second annular spacing between the support section and the sealing sleeve to form the second bypass shunt channel.

9. The hanger ball seat structure according to any one of claims 3-6, characterized in that, A support hole is provided in the support section, and the aperture of the support hole gradually decreases along the axial direction, and the aperture of the support hole at one end close to the central tube is larger than the aperture of the support hole at the end far from the central tube; Wherein, the setting ball abuts against the hole wall of the support hole.

10. A hanger, characterized in that, It includes the hanger ball seat structure according to any one of claims 1-9.

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