Blanking plug for underwater horizontal Christmas tree

Abstract

The blanking plug for the underwater horizontal Christmas tree is used for plugging an oil pipe to be plugged and comprises a blanking plug body, a first sealing device and a protection disc, the first sealing device is connected to the bottom end of the blanking plug body, and the protection disc is axially located on the lower side of the first sealing device and connected with the first sealing device. The protection disc covers the lower surface of the first sealing device. In the offshore oil exploitation process, a production channel of an oil pipe to be plugged is communicated with an oil well, high-pressure liquid and high-pressure gas in the oil well can bring out many other impurities such as silt when being sprayed out, and the impurities directly impact the lower surface of the first sealing device under the action of high pressure; in the scheme, the protection disc covers the lower surface of the first sealing device and replaces the first sealing device to bear the impact from silt, so that the lower surface of the first sealing device is effectively protected.

Description

Technical Field

[0001] The utility model relates to the technical field of oil exploitation, in particular to a plugging device for an underwater horizontal Christmas tree. Background Art

[0002] During offshore oil production, a lower plug is assembled in the oil pipe hanger of an underwater horizontal oil tree. A ground monitoring channel is formed on the upper side of the lower plug of the underwater horizontal oil tree, and a production channel is provided on the lower side. The lower plug is mainly used to realize the function of high-pressure liquid and high-pressure gas sealing of the production channel of the underwater oil tree. Since the high-pressure liquid and high-pressure gas in the production channel will first act on the lower plug, higher requirements are put forward on the sealing performance and use restrictions of the lower plug. How to improve the sealing performance of the lower plug is what the technicians in this field have been pursuing. Utility Model Content

[0003] The utility model aims to provide a plug for an underwater horizontal oil tree, which improves the sealing performance and service life of the plug by covering the lower surface of a first sealing device with a protective disc.

[0004] The plug for an underwater horizontal oil tree in the utility model is used to plug the oil pipe to be plugged, and comprises a plug body, a first sealing device and a protective disk, wherein the first sealing device is connected to the bottom end of the plug body, the protective disk is axially located at the lower side of the first sealing device and connected to the first sealing device, and the protective disk covers the lower surface of the first sealing device.

[0005] The protective disk extends a certain distance in the radial direction of the plug to cover the lower surface of the first sealing device, thereby being able to effectively protect the first sealing device, so that the first sealing device is effective and works stably for a long time; this is because, in the process of offshore oil exploitation, the production channel of the oil pipe to be blocked is connected to the oil well, and the high-pressure liquid and high-pressure gas in the oil well will bring out many other impurities, such as mud and sand, when they are sprayed out. These impurities directly impact the lower surface of the first sealing device under the action of high pressure. After long-term impact, the first sealing device will be damaged, thereby causing the sealing effect to decline or even fail; in this solution, the protective disk covers the lower surface of the first sealing device, replacing the first sealing device to withstand the impact from mud and sand, thereby effectively protecting the lower surface of the first sealing device.

[0006] Optionally, an outer wall of the protective disk is sleeved with a dirt cleaning piece, the dirt cleaning piece is in an annular structure, and the dirt cleaning piece protrudes radially from the protective disk.

[0007] Optionally, an outer side wall of the protective plate is provided with an annular receiving groove, the receiving groove is formed by the outer side wall being recessed inwardly, and the dirt cleaning member is arranged in the receiving groove.

[0008] Optionally, the dirt cleaning member is elastic.

[0009] Optionally, the accommodating groove is a wedge-shaped groove, and the axial dimension of the groove opening of the accommodating groove is smaller than the axial dimension of the groove bottom.

[0010] Optionally, the cleaning member is formed by connecting circular rods end to end;

[0011] The groove bottom is provided with a recessed section, which is formed by a portion of the surface of the groove bottom being further recessed inwards, and the axial dimension of the recessed section is smaller than the radial dimension of the circular rod.

[0012] Optionally, the protective disc is provided with a connecting portion, the first sealing device is provided with an adapting portion adapted to the connecting portion, and the connecting portion is threadedly connected to the adapting portion.

[0013] Optionally, the connecting portion is a columnar stud, and the connecting portion is arranged concentrically with the protective plate.

[0014] Optionally, the protective disk is covered with a spray layer, and the spray layer is a carbide spray layer.

[0015] Optionally, a stop pin is further included, which penetrates the protective disk axially, one end of the stop pin is connected to the lower surface of the first sealing device, and the other end is clamped on the lower side of the lower surface of the protective disk. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the specification and, together with the description, serve to explain the principles of the specification.

[0017] Figure 1 This is a structural exploded diagram of the plug in the embodiment of the utility model;

[0018] Figure 2 yes Figure 1 Top view;

[0019] Figure 3 yes Figure 2 A cross-sectional view along the YY direction of the figure;

[0020] Figure 4 is a structural diagram of a first sealing device;

[0021] Figure 5 is a structural diagram of a second sealing device;

[0022] Figure 6 yes Figure 5 A partial structural enlarged schematic diagram;

[0023] Figure 7 yes Figure 6 A partial structural enlarged schematic diagram;

[0024] Figure 8 yes Figure 3 An enlarged schematic diagram of the structure of the protective device part;

[0025] Fig. 9 is a schematic diagram of the structure of the locking assembly;

[0026] Fig.10 It is an assembly diagram of the end cylinder, locking assembly and limit pin;

[0027] Fig.11 It is an assembly flow chart, one;

[0028] Fig.12 It is the assembly flow chart, part 2;

[0029] Fig.13 It is the assembly flow chart, part 3;

[0030] Fig.14 This is the assembly flow chart, number four.

[0031] Figure 1-Figure 14 middle:

[0032] 100. Oil pipe to be plugged; 101. Inner pipe wall;

[0033] 200, plug;

[0034] 1. first sealing device; 11. sealing section; 111. U-shaped groove; 111a. mouth; 111b. bottom; 12. stopper;

[0035] 2. Second sealing device; 21. Upper end ring; 22. Sealing ring group; 221. First type sealing ring; 222. Second type sealing ring; 23. First spacer ring; 24. Second spacer ring; 25. Support ring; 26. Lower end ring; 22a. Inner ring side; 22b. Outer ring side; 22c. Arched surface; 22c-1. First fulcrum; 22c-2. Second fulcrum; 22c-3. Second peak; 22d. Pressure surface; 22d-1. Horizontal section; 22d-2. Arched section; 22d-3. First peak; 22e. Fourth peak; 22f. Third peak;

[0036] 3. Plug body; 31. Support cylinder; 31a. Lock channel; 31a-1. Lock hole; 31a-2. Assembly hole; 31b. Installation channel; 31b-1. External port; 31b-2. Internal port; 311. Main cylinder; 311a. Upper end surface; 312. End cylinder; 312a. Position limiting boss; 312a-1. Table surface; 32. Slip;

[0037] 4. Locking assembly; 41. Locking block; 411. Column segment; 412. Hemispherical segment; 42. Elastic member; 43. Connecting member;

[0038] 5. driving cylinder; 51. adapting section;

[0039] 6. Limit pin;

[0040] 7. Protective device; 71. Protective plate; 711. Accommodating groove; 711a. Notch; 711b. Groove bottom; 711b-1. Recessed section; 72. Connecting part; 73. Adapter part; 74. Cleaning part; 75. Stop pin. DETAILED DESCRIPTION

[0041] The utility model provides a plug for an underwater horizontal oil tree, which improves the sealing performance and service life of the plug by covering the lower surface of a first sealing device with a protective disc.

[0042] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0043] The up and down directions in this article are based on the working state of the underwater horizontal oil production tree using a plug to plug the oil pipe to be plugged. The up and down direction usually refers to the height direction of the plug when the plug is in the working state, that is, the central axis L of the plug extending in the height direction roughly coincides with the central axis of the oil pipe to be plugged, which roughly means that the central axis L of the plug completely coincides with the central axis of the oil pipe to be plugged or has a deflection of less than 5°. In the height direction of the plug, the side pointing to the seabed is down, and the side pointing to the sea surface and away from the seabed is up; the up and down direction is the axial direction of the support cylinder and the driving cylinder in this application, and the direction perpendicular to the up and down direction is the radial direction of the support cylinder and the driving cylinder.

[0044] Unless otherwise specified, the inside and outside orientations in this article are defined with reference to the central axis L of the plug extending in the height direction. On a plane perpendicular to the central axis L of the plug extending in the height direction, the side closer to the central axis L of the plug is the inside, and the side farther away from the central axis L of the plug is the outside. The central axis L of the plug coincides with the central axis of the support tube.

[0045] Relational terms such as “first” and “second” and the like are merely used to distinguish one component from another having the same name, but do not necessarily require or imply any such actual relationship or order between these components.

[0046] Please refer to Figures 1 to 7 , Figure 1 This is a structural exploded diagram of the plug in the embodiment of the utility model; Figure 2 yes Figure 1 Top view; Figure 3 It is a cross-sectional view along the YY direction of the figure; Figure 4 is a structural diagram of a first sealing device; Figure 5 is a structural diagram of a second sealing device; Figure 6 yes Figure 5 A partial structural enlarged schematic diagram; Figure 7 yes Figure 6 A partial structural enlarged schematic diagram;

[0047] As shown in the figure, the underwater horizontal oil tree plug 200 of the utility model includes a plug body 3, a first sealing device 1 and a second sealing device 2. The plug body 3 is a cylindrical structure. The central axis l of the plug 200 extends along its axial direction (that is, the height direction of the plug 200). The first sealing device 1 is connected to the bottom end of the plug body 3. In this way, the first sealing device 1 will first be subjected to the force of high-pressure liquid and high-pressure gas in the production channel. In order to facilitate replacement and maintenance, the first sealing device 1 and the plug body 3 can be detachably connected by threaded connection, plug-in connection, etc.

[0048] Specifically, the first sealing device 1 is a metal seal, and the first sealing device 1 has a stopper 12 and a sealing section 11. The sealing section 11 can radially press against the inner tube wall 101 of the oil pipe 100 to be blocked. In order to increase the radial extrusion force on the inner tube wall 101 of the oil pipe 100 to be blocked, the sealing section 11 is a wedge-shaped structure, and its radial size gradually decreases from top to bottom; the stopper 12 is located on the upper side of the sealing section 11 and is inclined to form an axial stop with the inner tube wall 101 of the oil pipe 100 to be blocked; the stopper 12 is a stopper boss protruding radially from the top of the sealing section 11, and the table surface of the stopper boss can be The plane extending in the radial direction may also be an inclined plane forming an angle with the radial direction. The specific form of the stopper 12 is not limited here, so long as it can form an axial stopper with the inner tube wall 101 of the oil pipe 100 to be blocked; wherein, the sealing section 11 is provided with a U-shaped groove 111, and the U-shaped groove 111 forms a mouth 111a on the lower surface of the sealing section 11, and the U-shaped groove 111 is concave upward in the axial direction to form a bottom 111b, and in the radial direction, the size of the bottom 111b is smaller than the size of the mouth 111a, that is, the U-shaped groove 111 is a flared structure; optionally, the bottom 111b exceeds the lowest point of the stopper 12 in the axial direction, that is, Figure 4 The radial dimension of the stopper 12 is the smallest, thereby ensuring that the pressure is fully applied to the U-shaped interface. Here, the sealing section 11 is conical, and the conical sealing section 11 is combined with the U-shaped groove 111, so that the sealing section 11 of the first sealing device 1 has better deformation.

[0049] In the present solution, the stopper 12 is used as a stop structure. During the process of lowering the plug 200 into the oil pipe 100 to be blocked, the plug 200 can be positioned axially, thereby avoiding the situation where the plug 200 is lowered too deep and cannot achieve effective sealing, ensuring the consistency of the interference fit between the sealing section 11 and the side wall of the oil pipe 100 to be blocked, and improving the stability of the sealing performance. Of course, in the present embodiment, the inner tube wall 101 of the oil pipe 100 to be blocked has a structure compatible with the sealing section 11 and the stopper 12, and technicians in this field can make adaptive designs according to actual needs.

[0050] As shown in the figure, the second sealing device is sleeved on the outside of the plug body 3 and is located on the upper side of the first sealing device 1. The second sealing device 2 can also be radially pressed to the inner tube wall 101 of the oil pipe 100 to be blocked to seal the oil pipe 100 to be blocked; this is because the working environment of the plug 200 is relatively complex, and it will be affected by the high-pressure liquid and high-pressure gas from the production channel, and the pressure and temperature of the high-pressure gas and high-pressure liquid will form high and low temperature conversion and high and low pressure alternation under the influence of the environment. The first sealing device 1 will be greatly affected by the high and low temperature conversion and high and low pressure alternation, which will affect the sealing cooperation between the sealing section 11 and the wall of the oil pipe 100 to be blocked. When air leakage occurs between the sealing section 11 and the wall of the oil pipe 100 to be blocked, the second sealing device 2 can play a secondary sealing effect to reduce or avoid air leakage.

[0051] The second sealing device specifically includes an upper end ring 21, a lower end ring 26 and a sealing ring group 22. The upper end ring 21, the lower end ring 26 and the sealing ring group 22 are all sleeved on the outside of the plug body 3 and arranged in sequence along the axial direction. The sealing ring group 22 is located between the upper end ring 21 and the lower end ring 26. Compared with the upper end ring 21, the lower end ring 26 is close to the first sealing device 1; in the initial state, the sealing ring group 22 is spaced apart from the inner tube wall 101 of the oil pipe 100 to be blocked. At this time, when the plug 200 is lowered into the oil pipe 100 to be blocked, friction between the outer wall of the sealing ring group 22 and the oil pipe 100 to be blocked is avoided, thereby damaging the sealing ring group 22; when the sealing ring group 22 is subjected to axial pressure, at least part of the sealing ring group 22 can expand radially to be pressed against the inner tube wall 101 of the oil pipe 100 to be blocked. Here, the axial pressure can be, on the one hand, the high-pressure liquid and high-pressure gas in the production channel, and the pressure direction at this time is from bottom to top; on the other hand, it can also come from the pressure generated during the pressurization test of the second sealing device 2 during the lowering of the plug 200, and the pressure direction at this time is from top to bottom; that is, the sealing ring group 22 can deform in response to the pressure from top to bottom (that is, radially expand in response to the pressure on its upper side), and this type of sealing ring group 22 is a type of sealing ring 221, and can also deform in response to the pressure from bottom to top (that is, to expand radially in response to the pressure on its lower side), and this type of sealing ring group 22 is a type of second sealing ring 222. When the sealing ring group 22 is deformed, the sealing ring group 22 will expand radially to increase its radial size, and then be pressed against the inner pipe wall 101 of the oil pipe 100 to be blocked, thereby forming a secondary seal on the pressure formed by the high-pressure liquid and high-pressure gas in the production channel, thereby increasing the sealing effect of the plug 200.

[0052] In a specific implementation, the first type of sealing ring 221 is located on the upper side of the second type of sealing ring 222, the first type of sealing ring 221 arches out in the axial direction toward the side away from the first sealing device 1, and the second type of sealing ring 222 arches out in the axial direction toward the side close to the first sealing device 1, the first type of sealing ring 221 and the second type of sealing ring 222 are roughly V-shaped structures, and the opening of the first type of sealing ring 221 is opposite to the opening of the second type of sealing ring 222, and the first type of sealing ring 221 is on the side close to the first sealing device 1. Side opening, that is, the lower part of the first type of sealing ring 221 forms an opening, the second type of sealing ring 222 opens on the side away from the first sealing device 1, and the upper part of the second type of sealing ring 222 forms an opening, and the side where the openings of the two are located is a recessed surface 22d, and the side axially opposite to the opening, that is, the arched side, is the arched surface 22c, wherein the recessed surface 22d is the side opposite to the radial expansion pressure that drives it to deform, and the arched surface 22c refers to the side opposite to the radial expansion pressure that drives it to deform.

[0053] When the sealing ring group 22 is subjected to pressure from the bottom to the top in the production channel, the second type of sealing ring 222 is in a failed state. At this time, the pressure mainly acts on the recessed surface 22d of the first type of sealing ring 221. Under the action of the pressure, the recessed surface 22d is deformed, thereby forming a radial expansion. On the one hand, the inner ring side surface 22a of the first type of sealing ring 221 is pressed against the plug body 3, and on the other hand, the outer ring side surface 22b of the first type of sealing ring 221 is pressed against the inner pipe wall 101 of the oil pipe to be plugged, thereby forming a seal; conversely, when pressure is applied from the upper side of the plug 200 to test the sealing performance of the plug 200, the first type of sealing ring 221 is in a failed (radial contraction) state, and the recessed surface 22d (open side) of the second type of sealing ring 222 is subjected to pressure from the top to the bottom, so that the second type of sealing ring 222 forms a radial expansion pressure to form a seal with the inner pipe wall 101 of the oil pipe to be plugged.

[0054] In the above embodiment, the first type of sealing ring 221 and the second type of sealing ring 222 can be multiple, and the multiple first type of sealing rings 221 are stacked in sequence along the axial direction, and the multiple second type of sealing rings 222 are stacked in sequence along the axial direction; further, the second sealing device 2 also includes a first spacer ring 23 and a second spacer ring 24, the first spacer ring 23 is axially arranged between two adjacent first type of sealing rings 221, and the second spacer ring 24 is axially arranged between two adjacent second type of sealing rings 222; the first spacer ring 23 and the first type of sealing ring 221 are arched in the same direction, and the second spacer ring 24 and the second type of sealing ring 222 are arched in the same direction, that is, the first spacer ring 23 and the second spacer ring 24 also form an approximate V shaped structure, the first spacer ring 23 and the second spacer ring 24 are made of polytetrafluoroethylene filled fiber material (polytetrafluoroethylene is a material with added fiber to increase hardness, the fiber can be carbon fiber or other types of fiber, so as to improve the temperature resistance of the material and ensure its temperature resistance under high temperature conditions); the first sealing ring 221 and the second sealing ring 222 are made of polytetrafluoroethylene filler material, and the hardness of the first spacer ring 23 and the second spacer ring 24 is greater than that of the first sealing ring 221 and the second sealing ring 222, so that the first spacer ring 23 and the second spacer ring 24 can play a sealing performance under high temperature working conditions, and at the same time can also protect the first sealing ring 221 and the second sealing ring 222.

[0055] This is because the inventor of the utility model creatively discovered that if the second sealing device 2 is made of rubber material, it will also be greatly affected by high and low temperature conversion and high and low pressure alternation, thereby affecting the sealing performance;

[0056] However, in the technical solution of the present application, the spacer ring is made of polytetrafluoroethylene filler material (a material with added fibers to increase hardness, and the fibers can be carbon fibers or other types of fibers, so as to improve the temperature resistance of the material and ensure its temperature resistance under high temperature conditions) and has a hardness greater than that of the sealing ring. Under high temperature conditions, the first spacer ring 23 and the second spacer ring 24 soften, and thus expand radially under the action of high pressure, thereby tightly pressing between the inner tube wall 101 of the oil pipe 100 to be blocked and the plug body 3, thereby blocking the gap between the plug body 3 and the inner tube wall 101 of the oil pipe 100 to be blocked in the circumferential direction of the plug body 3. In this way, on the one hand, the sealing performance of the second sealing device 2 under high temperature conditions can be ensured, and the high and low temperature bearing performance is better. In the complex environment of high and low temperature conversion and high and low pressure alternation on the seabed, long-term stable sealing can be achieved; on the other hand, it can avoid the situation where the sealing ring with a hardness lower than the spacer ring is further softened under high temperature conditions and is squeezed out of the aforementioned gap.

[0057] In the above implementation, the inner diameter radial size of the first type sealing ring 221 and the second type sealing ring 222 is smaller than the inner diameter radial size of the first spacing ring 23 and the second spacing ring 24; the outer diameter radial size of the first type sealing ring 221 and the second type sealing ring 222 is larger than the outer diameter radial size of the first spacing ring 23 and the second spacing ring 24. In this way, the first type sealing ring 221 and the second type sealing ring 222 play a major sealing role. When the pressure reaches a certain level, at least the first spacing ring 23 and the second spacing ring 24 will also undergo radial deformation, thereby also pressing the plugging device body 3 against the plugging device to be plugged. Between the inner tube wall 101 of the plugged oil pipe, on the one hand, the first spacer ring 23 and the second spacer ring 24 have radial deformation. When they expand radially, they leave space for the first type of sealing ring 221 and the second type of sealing ring 222 to further expand radially. At this time, the first type of sealing ring 221 and the second type of sealing ring 222 further press against the inner tube wall 101 of the plugged oil pipe, and the first spacer ring 23 and the second spacer ring 24 also participate in the sealing, which further improves the sealing effect against high pressure; on the other hand, it can reduce the axial effect of the sealing ring group 22 on the plug body 3 and the first sealing device 1 This is because, in the axial direction, the upper end ring 21 forms a limiting fit with the limiting convex provided on the plug body 3, and the lower end ring 26 forms a limiting fit with the upper surface of the first sealing device 1 protruding from the plug body 3. If the first spacing ring 23 and the second spacing ring 24 do not form radial extrusion with the inner pipe wall 101 to be blocked under high pressure, the axial pressure of the first sealing ring 221 and the second sealing ring 222 on the limiting convex and the first sealing device 1 cannot be dispersed, and the first spacing ring 23 and the second spacing ring 24 radially press against the inner pipe wall 101 to be blocked. By adopting the method of the tube wall 101, part of the axial pressure of the first sealing ring 221 and the second sealing ring 222 on the limiting convex and the first sealing device 1 can be consumed by the friction between the first spacer ring 23, the second spacer ring 24 and the inner tube wall 101; in order to increase the response range of the sealing ring group 22 to the pressure, in addition to the improvement in the structural size, the improvement is also made in the material. As mentioned above, the hardness of the first spacer ring 23 and the second spacer ring 24 is greater than that of the first sealing ring 221 and the second sealing ring 222, which makes the first spacer ring 23 and the second spacer ring 24 have a larger pressure-bearing range.

[0058] The arched surface 22c of the first type sealing ring 221 and the second type sealing ring 222 both have a first support position 22c-1 and a second support position 22c-2, and the first support position 22c-1 and the second support position 22c-2 are spaced from the edge of the arched surface 22c; the first support position 22c-1 is close to one side of the inner ring side surface 22a of the first type sealing ring 221 and the second type sealing ring 222, and is spaced from the inner ring side surface 22a, and the second support position 22c-2 is close to one side of the outer ring side surface 22b of the first type sealing ring 221 and the second type sealing ring 222, and is spaced from the outer ring side surface 22b; the two ends of the opening side of the first spacing ring 23 are pressed against the first support position 22c-1 and the second support position 22c-2 respectively, and the two ends of the opening side of the second spacing ring 24 are pressed against the first support position 22c-1 and the second support position 22c-2 of the second type sealing ring 222; in this way, the recessed surface 22d is subjected to pressure and When deformation occurs, the two ends of the opening sides of the first spacer ring 23 and the second spacer ring 24 will be axially pressed against the first support position 22c-1 and the second support position 22c-2, so that the inner ring side 22a and the outer ring side 22b of the first and second sealing rings 221 and 222 will be deflected to a certain extent with the first and second support positions 22c-1 and 22c-2 on the corresponding sides as the center, thereby forming radial expansion. In this way, when the first and second sealing rings 221 and 222 expand radially to form a seal, their arched surfaces 22c will not be completely fitted to the first and second spacer rings 23 and 24, thereby avoiding the limitation of their radial expansion size, and at the same time further improving the elasticity of the first and second sealing rings 221 and 222. In this way, even if the first and second sealing rings 221 and 222 are not made of rubber, they also have good elasticity of radial deformation.

[0059] Furthermore, the second sealing device 2 also includes a support ring 25, which is in an approximately diamond-shaped structure. The support ring 25 can be a hollow structure formed by the relative arrangement of the first spacer ring 23 and the second spacer ring 24, or a solid structure. The support ring 25 is against the adjacent first-class sealing ring 221 and second-class sealing ring 222; one end of the support ring 25 is arched in the same direction as the first-class sealing ring 221, and the other end is arched in the same direction as the second-class sealing ring 222; the support ring 25 is sleeved on the outside of the plug body 3, and the support ring 25 can slide in the axial direction. The upper end ring 21, the lower end ring 26, and the support ring 25 are polyetheretherketone, so that the upper end ring 21, the lower end ring 26, and the support ring 25 can increase the support of the overall structure of the sealing device; the hardness of the upper end ring 21, the lower end ring 22, and the support ring 25 is greater than that of the spacer ring, and polyetheretherketone can be used, so as to protect the spacer ring in a high temperature environment and prevent the spacer ring from being extruded. The inner diameter radial dimension of the first type sealing ring 221 and the second type sealing ring 222 is smaller than the inner diameter radial dimension of the support ring 25 ; the outer diameter radial dimension of the first type sealing ring 221 and the second type sealing ring 222 is larger than the outer diameter radial dimension of the support ring 25 .

[0060] Optionally, the recessed surface 22d of the first type sealing ring 221 and the second type sealing ring 222 includes two horizontal sections 22d-1 and a recessed section 22d-2, the recessed section 22d-2 is radially located between the two horizontal sections 22d-1, and the position where the horizontal section 22d-1 and the recessed section 22d-2 are connected is pressed against the support ring 25, the corresponding first spacer ring 23 or the second spacer ring 24, and the position where the horizontal section 22d-1 and the recessed section 22d-2 are connected is axially staggered with the first support position 22c-1 and the second support position 22c-2 on the corresponding side, and is located on the outside of the first support position 22c-1 and the second support position 22c-2 on the corresponding side, thereby further improving the elasticity of the first type sealing ring 221 and the second type sealing ring 222, so that they can achieve better radial sealing effect.

[0061] Optionally, the first type sealing ring 221 and the second type sealing ring 222 have a concave surface 22d and an arched surface 22c; the concave section 22d-2 of the concave surface 22d forms a first valley 22d-3, and the first valley 22d-3 is an arc-shaped structure; the arched surface 22c forms a first peak 22c-3, and the first peak 22c-3 extends in a straight line; the peak formed by the surface of the first spacer ring 23, the second spacer ring 24 or the support ring 25 opposite to the first valley 22d-3 is The second peak 22f extends in a straight line; the peak formed by the surface of the first spacer ring 23, the second spacer ring 24 or the support ring 25 opposite to the first peak 22c-3 is the second valley 22e, and the second valley 22e is an arc-shaped structure, thereby avoiding the axial fit between the first type sealing ring 221, the second type sealing ring 222, the first spacer and the second spacer, and further increasing the elasticity of the first type sealing ring 221 and the second type sealing ring 222.

[0062] like Figure 8 As shown, Figure 8 yes Figure 3 The enlarged structural diagram of the protective device part; the underwater horizontal Christmas tree plug of the utility model further includes a protective device 7, which is connected to the side of the first sealing device 1 away from the plug body, that is, located at the bottom end of the plug;

[0063] The protection device 7 specifically includes a protection disc 71 and a connecting portion 72. The protection disc 71 is connected to the first sealing device 1 through the connecting portion 72. The protection disc 71 is axially located at the lower side of the first sealing device 1. The protection disc 71 extends a certain distance in the radial direction of the plug to cover the lower surface of the first sealing device 1, thereby being able to effectively protect the first sealing device 1, so that the first sealing device 1 is effective and works stably for a long time. This is because, in the process of offshore oil production, the production channel of the oil pipe to be blocked is connected to the oil well, and the high-pressure liquid and high-pressure gas in the oil well will bring out many other impurities, such as mud and sand, when they are sprayed out. These impurities are Directly impacting the lower surface of the first sealing device 1 will damage the first sealing device 1 after a long period of impact, thereby causing the sealing effect to decline or even fail. In the present solution, the protective plate 71 covers the lower surface of the first sealing device 1, replacing the first sealing device 1 to withstand the impact from mud and sand, thereby effectively protecting the lower surface of the first sealing device 1. In order to further increase the strength of the protective plate 71, the protective plate 71 is covered with a spray coating, which is a carbide spray coating formed by supersonic flame spraying, thereby increasing the hardness of the protective plate 71, and the spray coating also plays an anti-corrosion role.

[0064] In the above-mentioned embodiment, a connecting portion 72 is provided on the upper surface of the protective disk 71, and the protective disk 71 is threadedly connected to the first sealing device 1 through the connecting portion 72, and an adapting portion 73 adapted to the connecting portion 72 is provided on the lower surface of the first sealing device 1; wherein, when the connecting portion 72 is a screw, the adapting portion 73 is a screw hole; when the connecting portion 72 is a screw hole, the adapting portion 73 is a screw; in a specific implementation, the connecting portion 72 is a columnar stud, and the stud is provided on the upper surface of the protective disk 71, and the central axis of the stud passes through the center of the protective disk 71, that is, the connecting portion 72 is concentrically arranged with the protective disk 71. At this time, the adapter portion 73 is a screw hole opened on the lower surface of the first sealing device 1, and the screw hole extends from the side of the lower surface axially away from the connecting portion 72. The length of the connecting portion 72 is adapted to the length of the screw hole to ensure that when the protective disk 71 is connected to the first sealing device 1, the upper surface of the protective disk 71 and the lower surface of the first sealing device 1 are axially abutted against each other. The way of arranging the stud on the protective disk 71 can avoid damaging the structural strength of the protective disk 71 by arranging the screw hole on the protective disk 71. At the same time, the way of arranging the stud and the center of the protective disk 71 can make the force on the first sealing device 1 more uniform.

[0065] In order to further improve the reliability of the connection between the protective plate 71 and the first sealing device 1, the protective device 7 also includes a stop pin 75, which penetrates the protective plate 71 axially, one end of the stop pin 75 is connected to the lower surface of the first sealing device 1, and the other end is clamped on the lower side of the lower surface of the protective plate 71.

[0066] In the above-mentioned embodiment, the protective device 7 can also include a cleaning piece 74, which has an annular structure and is formed by connecting circular rods end to end. Of course, it can also be a square rod or other shapes. The cleaning piece 74 is sleeved on the outer peripheral side wall of the protective disk 71, that is, it is sleeved on the outer side wall of the protective disk 71. The outer side wall of the protective disk 71 refers to the side surface arranged along the circumference of the protective disk 71 and extending axially. The cleaning piece 74 radially protrudes from the outer side wall of the protective disk 71; when the plug is lowered into the oil pipe to be blocked, the cleaning piece 74 will contact the inner pipe wall 101 of the oil pipe. As the plug moves downward, the cleaning piece 74 will scrape off the dirt on the inner pipe wall 101, thereby cleaning the inner pipe wall 101. In this way, when the first sealing device 1 and the second sealing device 2 form a seal with the inner pipe wall 101 later, It will not be affected by the dirt on the inner tube wall 101, thereby improving the sealing performance between the first sealing device 1, the second sealing device 2 and the inner tube wall 101; in this process, in order to prevent the cleaning member 74 from being misplaced, an annular receiving groove 711 is provided on the outer wall of the protective disk 71, and the receiving groove 711 is formed by the outer wall being recessed inwardly, and the cleaning member 74 is arranged in the receiving groove 711, so that the cleaning member 74 is limited by the receiving groove 711 to prevent it from being misplaced; in order to better limit the cleaning member 74, an annular receiving groove 711 is provided on the outer wall of the protective disk 71, and the receiving groove 711 is formed by the outer wall being recessed inwardly, and the cleaning member 74 is arranged in the receiving groove 711; the receiving groove 711 is a wedge-shaped groove, and the axial dimension of the groove opening 711a is smaller than the axial dimension of the groove bottom 711b.

[0067] In another optional implementation, the cleaning member 74 is elastic. The material of the cleaning member 74 itself can be elastic, such as rubber or hard plastic with a certain elasticity; or the structure of the cleaning member 74 makes it elastic, for example, the cross-section of the cleaning member 74 is a V-shaped structure, an O-shaped structure, a diamond-shaped structure, etc.; wherein the O-shaped structure can be that the cleaning member 74 is a hollow round rod, or a solid round rod; in this case, the groove bottom 711b is provided with a recessed section 711b-1, and the recessed section 711b-1 is provided with a recessed section 711b-2. Segment 711b-1 is formed by the surface of part of the groove bottom 711b continuing to be recessed inward, and the axial dimension of the recessed segment 711b-1 is smaller than the radial dimension of the round rod, so that the recessed segment 711b-1 can further limit the axial direction of the round rod; through such a structural setting, the elastic cleaning piece 74 can also play a certain sealing role. When the pressure of the high-pressure liquid and the high-pressure gas is too high, the accommodating groove 711 also provides sufficient accommodating space for the cleaning piece 74, thereby avoiding damage to the cleaning piece 74.

[0068] In another aspect of the present application, Fig. 9 and Fig.10As shown, the plug 200 includes a plug body 3, a locking assembly 4 and a driving cylinder 5. The plug body 3 specifically includes a support cylinder 31 and a cava 32. The side wall of the support cylinder 31 is slidably connected with a plurality of cava 32. The cava 32 can extend and retract radially relative to the support cylinder 31. The radial extension of the cava 32 is driven by the driving cylinder 5. The driving cylinder 5 is inserted into the support cylinder 31, that is, the driving cylinder 5 is built into the support cylinder 31, and can move up and down relative to the support cylinder 31 along the axial direction of the support cylinder 31; specifically, when the plug 200 is lowered into the oil pipe 100 to be blocked, the driving cylinder 5 moves downward, and during its downward movement, the cava 32 is radially pushed out of the support cylinder 31 until the cava 32 is engaged with the pipe wall of the oil pipe 100 to be blocked, and the locking assembly 4 can be radially pressed against the outer cylinder wall 5a of the driving cylinder 5, thereby forming an axial limit for the driving cylinder 5, thereby preventing the driving cylinder 5 from retreating (moving upward).

[0069] The locking assembly 4 specifically includes a locking block 41 and an elastic member 42. The locking block 41 is installed in the support cylinder 31. The support cylinder 31 includes a main cylinder body 311 and an end cylinder body 312. The main cylinder body 311 is connected to the slip 32, and the end cylinder body 312 is connected to the top of the main cylinder body 311; the end cylinder body 312 is provided with a locking path 31a for accommodating the locking block 41, the locking block 41 is built into the locking path 31a, and is elastically connected to the locking path 31a through the elastic member 42, the locking path 31a extends in a straight line, and at least part of it forms a locking port 31a-1 on the inner cylinder wall of the support cylinder 31; the locking block 41 can pop out of the locking port 31a-1 to form a lock with the driving cylinder 5 or retract into the locking port 31a-1 to unlock, and the locking block 41 can be locked with the driving cylinder 5. Stopping refers to that part of the locking block 41 pops out from the locking port 31a-1 to radially press against the outer wall of the driving cylinder 5 to prevent the driving cylinder 5 from retreating; unlocking refers to that the locking block 41 retracts into the locking port 31a-1 to reduce or avoid contact with the driving cylinder 5. At this time, the axial movement of the driving cylinder 5 is not restricted by the locking block 41; in more detail, unlocking and locking are realized in sequence during the downward movement of the locking block 41. During the downward movement of the driving cylinder 5, the locking block 41 can be pushed back into the locking port 31a-1 first. At this time, the locking block 41 compresses the elastic member 42. When the driving cylinder 5 moves down to the set position and no longer moves down, driven by the elastic member 42, the locking block 41 extends out of the locking port 31a-1 to radially press against the driving cylinder 5 to lock it.

[0070] During the research, the applicant found that due to the structural limitation of the drive cylinder 5, it needs to be inserted into the end cylinder 312 from bottom to top. However, as mentioned above, the locking block 41 will prevent the drive cylinder 5 from moving up. In this way, during the installation of the drive cylinder 5 to the end cylinder 312, the locking block 41 will cause interference. If a strong insertion is performed, it will inevitably cause damage to the locking assembly 4, thereby affecting the subsequent locking effect of the drive cylinder 5. In order to solve the above problem, the end cylinder 312 is also provided with an installation channel 31b, and the installation channel 31b is used to insert the limit pin 6. The limit pin 6 is used to keep the locking block 41 in the lock channel 31a to prevent the locking block 41 from extending out of the lock port 31a-1.

[0071] Specifically, the installation channel 31b forms an outer opening 31b-1 on the outer cylinder wall of the end cylinder 312, and the outer opening 31b-1 serves as an insertion hole for the limit pin 6, that is, the limit pin 6 is inserted into the installation channel 31b through the outer opening 31b-1 and pulled out from the outer opening 31b-1, wherein the outer cylinder wall of the end cylinder 312 includes a portion other than the inner cylinder wall of the end cylinder 312, which includes an end wall and an outer wall; by setting the outer opening 31b-1 on the outer cylinder wall of the end cylinder 312, it is convenient to insert and pull out the limit pin 6, and then the limit pin 6 can be inserted into the lock track 31a to operate the lock block 41, and the position of the inner opening can be set by a technician in this field so that the limit pin 6 can be inserted into the lock track 31a and the lock block 41 can be operated.

[0072] The installation channel 31b forms an inner opening 31b-2 on the side wall of the lock track 31a, and the limit pin 6 enters the lock track 31a through the inner opening 31b-2. The inner opening 31b-2 is located at the rear side of the lock opening 31a-1 or opposite to the lock opening 31a-1 in the pop-up direction of the lock block 41; wherein the pop-up direction refers to the direction in which the elastic member 42 restores the elastic deformation, that is, the elastic member 42 drives the lock block 41 to gradually move toward the lock opening 31a-1. In the moving direction, the lock port 31a-1 is located at the front end of the inner port 31b-2, that is, the lock block 41 will first pass through the inner port 31b-2 and then pass through the lock port 31a-1 in its ejection direction; or, the inner port 31b-2 and the lock port 31a-1 are roughly aligned, that is, the lock block 41 passes through the lock port 31a-1 and the inner hole at the same time in the ejection direction, which roughly means that the center of the inner hole and the lock port 31a-1 has a swing of 0.1° to 5°. Of course, the inner port 31b-2 can also be set at the front side of the lock port 31a-1, so as to be able to operate the lock block 41.

[0073] By setting the inner opening 31b-2 at the rear side of the lock opening 31a-1 or at a position roughly opposite to the lock opening 31a-1 in the pop-up direction of the lock block 41, a stopper can be formed for the lock block 41 in the pop-up direction of the lock block 41, thereby preventing the lock block 41 from popping out of the lock opening 31a-1. In this way, during the process of inserting the drive cylinder 5 into the end cylinder body 312, the lock block 41 is limited by the limit pin 6, thereby preventing the lock block 41 from interfering with the drive cylinder 5 in its insertion direction, thereby avoiding the situation where the locking assembly 4 is damaged by forcibly plugging the two together.

[0074] In the above-mentioned implementation method, at least two of the locking channels 31a are opened, and the locking channels 31a are evenly arranged along the circumference relative to the central axis of the support cylinder 31; the locking mouth 31a-1 is evenly arranged along the circumference of the inner cylinder wall of the end cylinder 312, and the parameters of the elastic member 42 and the locking block 41 are kept consistent. In this way, under the action of the elastic member 42, several locking blocks 41 play a role in straightening the driving cylinder 5, keeping the central axis of the driving cylinder 5 coincident with the central axis of the end cylinder 312 and the main cylinder 311, thereby further improving the structural stability of the plug 200.

[0075] The specific structure of the plug 200 is described below with reference to a specific embodiment.

[0076] Embodiment 1

[0077] In this embodiment, the lock track 31a extends in the height direction, and the radial spacing with the driving cylinder 5 gradually decreases from bottom to top; that is, the central axis of the lock track 31a has a certain deviation relative to the central axis of the support cylinder 31 (the central axis of the end cylinder 312), and the direction of the deviation is counterclockwise from the outside to the inside, and the deviation angle is 6°-12°. In this way, the upper side of the lock track 31a will be closer to the driving cylinder 5, and the lower side of the lock track 31a will be farther away from the driving cylinder 5 than its upper side; the lock track 31a is tilted from bottom to top towards the driving cylinder 5, which can guide the popping out and retraction of the lock block 41.

[0078] In one aspect of the present embodiment, in order to facilitate the installation, removal and replacement of the locking block 41 and the elastic member 42 and to improve the service life of the plug 200, in the present solution, the end cylinder 312 has a limiting boss 312a, and the limiting boss 312a extends radially inward to partially cover the port of the main cylinder 311, that is, the table 312a-1 of the limiting boss 312a is pressed against the upper end surface 311a of the main cylinder 311 in the axial direction, and the inner ring of the limiting boss 312a of the end cylinder 312 extends radially inward, and the lower end of the locking channel 31a passes through the The table 312a-1 forms an assembly hole 31a-2, and the assembly hole 31a-2 is located at the lower end of the lock track 31a, that is, at the end of the lock track 31a away from the driving cylinder 5; by setting the assembly hole 31a-2 at the part of the table 312a-1 suspended in the inner cavity of the main cylinder 311, on the one hand, it is convenient to install and disassemble the locking block 41 and the elastic member 42; on the other hand, it avoids the position where the upper end surface 311a of the main cylinder 311 and the table 312a-1 of the limiting boss 312a of the end cylinder 312 are pressed against each other, thereby preventing interference with the installation accuracy of the two.

[0079] More specifically, in order to block the assembly hole 31a-2 and provide support for the elastic member 42, the locking assembly 4 also includes a connecting member 43, which is detachably connected to the assembly hole 31a-2; for example, the connecting member 43 is a bolt, and the connecting member 43 is threadedly connected to the assembly hole 31a-2; or, the connecting member 43 is a clamping block, and the clamping block is clamped with the assembly hole 31a-2; the upper end of the elastic member 42 abuts against the connecting member 43, and the lower end abuts against the locking block 41, so that the elastic member 42 is connected to the lock track 31a through the connecting member 43; of course, the elastic member 42 may not abut against the connecting member 43, but a convex ring or a protrusion is provided in the lock track 31a, and the elastic member 42 is pressed against the convex ring or the protrusion.

[0080] On the other hand, in the present embodiment, the specific structure of the locking block 41 is designed. Through the specific structural design of the locking block 41 and the inclined setting of the lock path 31a, the radial squeezing force of the locking block 41 on the driving cylinder 5 can be significantly increased, and the friction between the locking block 41 and the driving cylinder 5 can be improved, thereby achieving a better anti-retraction effect; the locking block 41 specifically includes a column segment 411 and a hemispherical segment 412 connected to each other, the column segment 411 is against the elastic member 42, and the hemispherical segment 412 is used to contact with the driving cylinder 5 The hemispherical body segment 412 is coaxially arranged with the lock track 31a. Since the lock opening 31a-1 is located on the side wall of the lock track 31a and also on the inner wall of the support cylinder 31, when the lock block 41 moves to the position of the lock opening 31a-1, the hemispherical body segment 412 extends out of the lock opening 31a-1, which causes the front end of the lock block 41 to move radially inwardly (close to the side of the drive cylinder 5) of the lock track 31a, that is, the hemispherical body segment 412 is in the ejection position. Driven by the hemispherical body segment 412 at the front end, the column The body section 411 is forced to move in the reverse direction, that is, the column section 411 moves radially outward of the lock track 31a (the side away from the driving cylinder 5), so that the central axis of the column section 411 is deflected relative to the central axis of the lock track 31a to radially press against the side wall of the lock track 31a; and the line between the position where the column section 411 presses against the side wall of the lock track 31a and the lock opening 31a-1 passes through the central axis of the lock track 31a; it can be seen that at this time, the lock block 41 is on the one hand supported by the elastic member 4 2, because the lock track 31a is inclined, the direction of the elastic force is also inclined toward the direction close to the drive cylinder 5 and applied to the drive cylinder 5, which increases the friction force of the lock block 41 on the drive cylinder 5; on the other hand, the column section 411 of the lock block 41 radially presses against the lock wall of the lock track 31a, that is, the end cylinder 312 provides a fulcrum for the lock block 41 at this time, which can further increase the pressure of the lock block 41 on the drive cylinder 5, thereby increasing the friction force between the lock block 41 and the drive cylinder 5, and increasing the resistance of the drive cylinder 5 to move upward.

[0081] In this embodiment, in order to facilitate installation, the installation channel 31b extends in the horizontal direction. During installation, the limit pin 6 is first inserted into the installation channel 31b, and then the locking block 41 (the hemispherical section 412 is on the top, and the column section 411 is on the bottom) and the elastic member 42 are sequentially installed through the assembly hole 31a-2, and then the assembly hole 31a-2 is blocked with the connecting member 43. At this time, the locking block 41 is pressed against the limit pin 6, thereby preventing the locking block 41 from popping out of the lock port 31a-1; after the locking block 41 is assembled, the driving cylinder 5 is inserted from bottom to top into the end cylinder 312 until the driving cylinder 5 reaches the set position, and then the limit pin 6 is removed, and then Then connect the end cylinder 312 with the main cylinder 311; at this time, the drive cylinder 5 does not need to move upward any more, but only needs to move downward to drive the cava 32 to protrude radially; wherein, the portion of the drive cylinder 5 that cooperates with the locking block 41 is defined as the adapter section 51, and the adapter section 51 extends in a straight line. Due to the adoption of this scheme, the locking block 41 and the adapter section 51 have sufficient strength to prevent the drive cylinder 5 from retreating, thereby eliminating the need to set other blocks or cams on the adapter section 51 of the drive cylinder 5 for limiting. This simplifies the structure of the adapter section 51 of the drive cylinder 5 and reduces its processing accuracy and the complexity of the processing technology.

[0082] Embodiment 2

[0083] In this embodiment, the same parts as those in the first embodiment are not described again, and only the parts different from the first embodiment are described. The locking track 31a extends radially; the locking track 31a extends radially along the end cylinder 312, and one end thereof penetrates the outer cylinder wall of the end cylinder 312 to form an assembly hole 31a-2; the mounting channel 31b can extend axially, and the outer opening 31b-1 of the mounting channel 31b is located on the upper end surface 311a of the end cylinder 312, and the inner opening 31b-2 of the mounting channel 31b is connected to the locking track 31a; the installation method of the drive cylinder 5, the locking assembly 4 and the end cylinder 312 can be understood by referring to the first embodiment.

[0084] In each of the above-mentioned embodiments, the driving cylinder 5 has a primary salvage portion and a secondary salvage portion, the salvage portion is used to match the driving cylinder 5 delivery tool, and the primary salvage portion is axially located on the upper side of the secondary salvage portion, or on the lower side of the secondary salvage portion; by setting the secondary salvage portion as a protective structure for failure of the primary salvage fish diameter, it is prevented that when the primary fish diameter is damaged under unexpected conditions, the plug cannot be removed, causing losses; optionally, a groove portion is also provided on the inner wall of the driving cylinder 5, the groove portion is used to cooperate with the spring claw of the delivery tool to verify whether the plug 200 is completely seated (forming an effective seal with the inner pipe wall 101 of the oil pipe 100 to be blocked). After the design, the spring claw needs to reach a force value to lift the groove. If the plug is not completely seated, the spring claw cannot be unlocked and the plug will be lifted out.

[0085] Next, combine Figure 10-Figure 14 The assembly process of the plug 200 is described. The assembly process of the plug is divided into two parts:

[0086] Part I

[0087] In the first part, as Figure 11-Figure 14 Complete the assembly of the first sealing device 1, the second sealing device 2, the protective device 7 and the main cylinder 311;

[0088] Step 11, sleeve the second sealing device 2 on the main cylinder 311 and locate it at the lower side of the installation position of the slip 32 of the main cylinder 311;

[0089] Step 12, threading the first sealing device 1 to the main cylinder 311;

[0090] Step 13: Thread the protection plate 71 and the first sealing device 1 together, and use the locking pin 75 to pin the protection plate 71 and the first sealing device 1 together.

[0091] Part 2

[0092] In the second part, as Fig.10 and Fig.14 , complete the assembly of the drive cylinder 5, the end cylinder 312 and the main cylinder 311; wherein, the assembly step of the second part can be performed before the assembly step of the first part, or after the assembly step of the first part is completed, the assembly step of the second part can be performed, and those skilled in the art can choose according to the actual situation;

[0093] In the assembly process of the driving cylinder 5 and the plug body 3 of this part, the driving cylinder 5 is first assembled with the end cylinder 312 before being inserted into the main cylinder 311 and connected with the main cylinder 311; the specific assembly process of the driving cylinder 5, the locking assembly 4, the end cylinder 312 and the main cylinder 311 is as follows;

[0094] Step 21, insert the limit pin 6 into the installation channel 31b;

[0095] Step 22, sequentially install the locking block 41 (the hemispherical section 412 is on the top, the column section 411 is on the bottom) and the elastic member 42 through the assembly hole 31a-2;

[0096] Step 23: Use the connecting piece 43 to block the assembly hole 31a-2. At this time, the locking block 41 is pressed against the limiting pin 6, thereby preventing the locking block 41 from popping out of the locking hole 31a-1;

[0097] Step 24, after assembling the locking block 41, insert the drive cylinder 5 into the end cylinder 312 from bottom to top until the drive cylinder 5 reaches the set position, remove the limit pin 6, and then thread the end cylinder 312 and the main cylinder 311. At this time, the drive cylinder 5 is also inserted into the main cylinder 311. In order to prevent the drive cylinder 5 from driving the cava 32 to move, use pliers or clamps to clamp the cava.

[0098] The above is a detailed introduction to the instrument supply device provided by the utility model. This article uses specific examples to illustrate the principle and implementation method of the utility model. The description of the above embodiments is only used to help understand the core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A plug for an underwater horizontal Christmas tree, used to plug an oil pipe to be plugged, characterized in that: It includes a plug body, a first sealing device and a protective disk, wherein the first sealing device is connected to the bottom end of the plug body, the protective disk is axially located at the lower side of the first sealing device and is connected to the first sealing device, and the protective disk covers the lower surface of the first sealing device; the outer wall of the protective disk is sleeved with a dirt cleaning piece, the dirt cleaning piece is in an annular structure, and the dirt cleaning piece protrudes radially from the protective disk; the outer wall of the protective disk is provided with an annular accommodating groove, the accommodating groove is formed by the outer wall being recessed inwardly, and the dirt cleaning piece is arranged in the accommodating groove.

2. The plug for underwater horizontal Christmas tree according to claim 1, characterized in that: The dirt cleaning member is elastic.

3. The plug for underwater horizontal Christmas tree according to claim 1, characterized in that: The receiving groove is a wedge-shaped groove, and the axial dimension of the groove opening of the receiving groove is smaller than the axial dimension of the groove bottom.

4. The plug for underwater horizontal Christmas tree according to claim 3, characterized in that: The dirt-cleaning member is formed by connecting circular rods end to end; The groove bottom is provided with a recessed section, which is formed by a portion of the surface of the groove bottom being further recessed inwards, and the axial dimension of the recessed section is smaller than the radial dimension of the circular rod.

5. The plug for underwater horizontal Christmas tree according to claim 1, characterized in that: The protective disc is provided with a connecting portion, and the first sealing device is provided with an adapting portion adapted to the connecting portion, and the connecting portion is threadedly connected to the adapting portion.

6. The plug for underwater horizontal Christmas tree according to claim 5, characterized in that: The connecting portion is a columnar stud, and the connecting portion is arranged concentrically with the protective plate.

7. The plug for underwater horizontal Christmas tree according to any one of claims 1 to 6, characterized in that: The protective disk is covered with a spray layer, and the spray layer is a carbide spray layer.

8. The plug for underwater horizontal Christmas tree according to any one of claims 1 to 6, characterized in that: It also includes a stop pin, which penetrates the protective disk along the axial direction, one end of the stop pin is connected to the lower surface of the first sealing device, and the other end is clamped on the lower side of the lower surface of the protective disk.

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