Annular blowout preventer and well control system

Abstract

The application provides a ring-shaped blowout preventer and a well control system, and belongs to the field of oil drilling engineering. The shell part of the ring-shaped blowout preventer has a containing cavity, and opposite sides of the shell part are provided with through holes in communication with the containing cavity; the piston part is located in the containing cavity and is used for lifting between the two through holes; at least three hard alloy blocks are in sliding connection with the piston part, the hard alloy blocks are provided with first sealing parts facing the adjacent hard alloy blocks and second sealing parts facing away from the piston part, the hard alloy blocks are gathered together under the driving of the lifting of the piston part, the first sealing parts of each adjacent hard alloy block abut against each other, the second sealing parts abut against each other or are used for jointly holding a drill pipe in the well control system passing through the through holes to block the two through holes; or the hard alloy blocks are away from each other, so that the first sealing parts and the second sealing parts slide with the corresponding hard alloy blocks to communicate the two through holes. In this way, the hard alloy blocks have good compression resistance and are not easy to age, and the service life of the whole sealing assembly can be prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of oil drilling engineering, and in particular to an annular blowout preventer and a well control system. BACKGROUND

[0002] The annular blowout preventer is the core equipment in the well control system, and is used for sealing the annular space of the wellhead to provide safety guarantee for preventing blowout.

[0003] In the related art, the annular blowout preventer mainly comprises a shell, a top cover, a piston and a rubber core. When it is necessary to close the wellhead, the piston is driven to move upward by a hydraulic device to compress the rubber core, so that the rubber core is deformed to tightly wrap the drill pipe or other downhole tools, thereby preventing high-pressure fluid from being sprayed out of the well.

[0004] However, the rubber core in the annular blowout preventer has poor compression resistance and is prone to aging, and has a low service life. SUMMARY

[0005] The present application provides an annular blowout preventer and a well control system to solve the problem of poor compression resistance and low service life of the rubber core in the annular blowout preventer in the related art.

[0006] In one aspect, the present application provides an annular blowout preventer, comprising:

[0007] A shell member, the shell member has a receiving cavity therein, and the shell member is provided with through holes in communication with the receiving cavity on opposite sides thereof;

[0008] A piston member, the piston member is located in the receiving cavity and is used for lifting between the two through holes;

[0009] A sealing assembly, comprising at least three hard alloy blocks, each hard alloy block is in sliding connection with the piston member, the hard alloy block is provided with a first sealing portion and a second sealing portion, the first sealing portion is arranged towards the adjacent hard alloy block, and the second sealing portion is arranged away from the piston member; each hard alloy block is configured to be gathered or separated from each other under the driving of the lifting of the piston member; when gathered, each adjacent first sealing portion abuts against each other, and each second sealing portion abuts against each other or is used for collectively holding the drill pipe in the well control system passing through the through hole to block the two through holes; when separated, the first sealing portion and the second sealing portion slide with the corresponding hard alloy block to communicate the two through holes.

[0010] In one possible implementation, the annular blowout preventer provided by the present application has at least four hard alloy blocks.

[0011] Each of the adjacent first sealing portions abuts to form at least four first sealing lines, which extend obliquely along the extension direction of the corresponding hard alloy block; each of the second sealing portions abuts to form a second sealing line extending along the diameter direction of the through hole, or the second sealing portions collectively enclose a helical tooth, which helically extends along the axial direction of the through hole, and is used to be matched and inserted into a helical tooth groove on the outer side of the drill rod to enable the second sealing portions to collectively embrace the drill rod; and the two through holes are blocked.

[0012] In a possible implementation, the annular blowout preventer provided by the present application further comprises a first sleeve, and the piston member is sleeved on the first sleeve, and the first sleeve is coaxially arranged with the through hole;

[0013] The side of the piston member facing the first sleeve has a first inclined surface, and the side of the hard alloy block facing the piston member has a second inclined surface; the hard alloy block has opposite first and second sides, the first side is attached to the first sleeve, and the second side is attached to the inner wall of the shell member; the second inclined surface is configured to slide along the first inclined surface under the driving of the lifting of the piston member to move the corresponding hard alloy block towards or away from the axis of the through hole, so that the hard alloy blocks are gathered or separated from each other.

[0014] In a possible implementation, the annular blowout preventer provided by the present application, the first sleeve comprises:

[0015] a sleeve portion, on which the piston member is sleeved;

[0016] a limiting portion, which is connected with the sleeve portion and is arranged around the circumference of the sleeve portion, and is configured to abut against the piston member when the hard alloy blocks are gathered.

[0017] In a possible implementation, the annular blowout preventer provided by the present application further comprises at least three sliding members, which are connected with the hard alloy blocks one by one; the circumferential side of the piston member is spaced apart to form at least three sliding grooves, which are located on the first inclined surface; the sliding members are arranged in the sliding grooves one by one, and are configured to move along the extension direction of the sliding grooves when the piston member is lifted.

[0018] In a possible implementation, the annular blowout preventer provided by the present application, the sliding member comprises a sliding block, which is connected with the corresponding hard alloy block and is arranged in the sliding groove; or,

[0019] the sliding member comprises a second sliding block and a pin shaft, which are located in the sliding groove; the second sliding block is connected with the corresponding hard alloy block, and a insertion hole is formed in the second sliding block; the pin shaft is inserted into the insertion hole to enable the pin shaft cap of the pin shaft to contact one side of the second sliding block; a groove is formed in the circumferential side adjacent to the other side of the second sliding block, and a clamping spring is arranged in the groove; a grommet is sleeved on the clamping spring, and the grommet contacts the other side of the second sliding block.

[0020] In a possible implementation, the annular blowout preventer provided by the application further comprises a second sleeve, the second sleeve is located in the accommodating cavity, and the first sleeve is located in the second sleeve, and the second sleeve is coaxially arranged with the first sleeve; the piston member is in sliding connection with the second sleeve.

[0021] In a possible implementation, the annular blowout preventer provided by the application, the shell member comprises a shell part and a cover part arranged on the shell part; the shell part and the cover part jointly enclose the accommodating cavity, and the shell part and the cover part are both provided with a through hole; the cover part has an abutting part on the side facing the shell part, the abutting part is in communication with the through hole, and the side of the abutting part away from the cover part is used to be attached to the second side; the circumferential side of the abutting part has a third inclined surface matched with the first inclined surface, and the third inclined surface is used to abut against part of the first inclined surface when the hard alloy blocks are gathered together.

[0022] In a possible implementation, the annular blowout preventer provided by the application, the first side and the second side are both coated with a wear-resistant coating.

[0023] On the other hand, the application provides a well control system, comprising a system body and any one of the annular blowout preventers described above arranged on the system body; the system body comprises a drill pipe and a hydraulic device; the annular blowout preventer is arranged in a well, and the drill pipe passes through the two through holes of the shell member of the annular blowout preventer in sequence to be partially located in the well; the hydraulic device is used to inject hydraulic oil into the accommodating cavity of the shell member to lift or lower the piston member, and the hard alloy blocks of the annular blowout preventer are used to gather together or move away from each other under the driving of the lifting or lowering of the piston member to close or open the wellhead of the well.

[0024] The annular blowout preventer and the well control system provided by the application, the annular blowout preventer is provided with a shell member, the shell member has an accommodating cavity, and the opposite sides of the shell member are both provided with a through hole in communication with the accommodating cavity; the piston member is located in the accommodating cavity and is used to lift or lower between the two through holes; at least three hard alloy blocks are provided, each of the hard alloy blocks is in sliding connection with the piston member, the hard alloy block has a first sealing part and a second sealing part, the first sealing part is arranged towards the adjacent hard alloy block, and the second sealing part is arranged away from the piston member; each of the hard alloy blocks is used to gather together or move away from each other under the driving of the lifting or lowering of the piston member; when gathering together, each of the adjacent first sealing parts abuts against each other, and each of the second sealing parts abuts against each other or is used to jointly hold the drill pipe in the well control system passing through the through hole to block the two through holes; when moving away from each other, the first sealing part and the second sealing part slide with the corresponding hard alloy block to communicate the two through holes.

[0025] Thus, by setting at least three cemented carbide blocks, the first and second sealing parts ensure sufficient contact between the blocks to achieve balanced force distribution, forming a stable sealing structure. Simultaneously, it allows for the construction of more complex and / or longer sealing paths to block the two through holes, achieving a better sealing effect. The high-density structure of the cemented carbide blocks provides high hardness and strength, and good compressive strength. Furthermore, the cemented carbide blocks exhibit good chemical inertness, offering strong resistance to ultraviolet radiation and oxygen in the natural environment, preventing aging problems caused by chemical corrosion and extending the overall service life of the sealing assembly. Attached Figure Description

[0026] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0027] Figure 1 This is a schematic diagram of the structure of the annular blowout preventer provided in this application;

[0028] Figure 2 for Figure 1 A schematic diagram of the sealing assembly in the diagram;

[0029] Figure 3 Use of the annular blowout preventer provided in this application Figure 1 ;

[0030] Figure 4 Use of the annular blowout preventer provided in this application Figure 2 ;

[0031] Figure 5 for Figure 3 A partial structural diagram;

[0032] Figure 6 for Figure 4 A partial structural diagram;

[0033] Figure 7 for Figure 1 A schematic diagram of the structure of the first sleeve in the middle;

[0034] Figure 8 for Figure 6 A schematic diagram of the pin structure in the diagram;

[0035] Figure 9 for Figure 8 Connection diagram of the pin and pin cap;

[0036] Figure 10 for Figure 1 A schematic diagram of the piston component in the diagram;

[0037] Figure 11 for Figure 10Internal structure schematic view at A;

[0038] Figure 12 Structure schematic view of the cover setting part in Figure 1 Structure schematic view of the cover setting part in

[0039] Legend of reference signs:

[0040] 100 - housing part; 110 - containing cavity; 111 - first sub-containing cavity; 112 - second sub-containing cavity; 120 - through hole; 101 - housing part; 102 - cover setting part; 1021 - abutting part; 1022 - third inclined surface;

[0041] 200 - piston part; 210 - fitting part; 211 - first inclined surface; 212 - sliding groove; 220 - sliding part; 221 - sliding section; 2211 - sliding cavity; 2212 - opening; 222 - contact section;

[0042] 300 - sealing assembly; 310 - hard alloy block; 311 - second inclined surface; 312 - first side; 313 - second side; 3141 - first sealing part; 3142 - second sealing part; 301 - first sealing line; 302 - second sealing line;

[0043] 400 - first sleeve; 410 - sleeve part; 420 - limiting part;

[0044] 500 - second sleeve;

[0045] 600 - sliding part; 610 - second sliding block; 620 - pin shaft; 6211 - pin shaft cap; 6212 - pin rod; 6213 - groove; 6221 - circlip; 6222 - spacer ring. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme in the embodiments of the present application will be described in more detail below in combination with the drawings in the preferred embodiments of the present application. In the drawings, the same or similar reference signs represent the same or similar components or components with the same or similar functions throughout. The described embodiments are part of the embodiments of the present application, not all of the embodiments. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application. The embodiments of the present application will be described in detail below in combination with the drawings.

[0047] In the description of the application, it is necessary to explain that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood in a broad sense, for example, it can be fixedly connected, it can be indirectly connected through an intermediate medium, it can be the internal communication of two elements or the interaction relationship of two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0048] In the description of the application, it is necessary to understand that the terms "up", "down", "front", "back", "left", "right" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the application.

[0049] The terms "first", "second", "third", "fourth" and the like in the specification and claims of the application and the above drawings are used to distinguish similar objects, and do not necessarily have to describe a particular order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the application described herein, for example, can be implemented in an order other than those illustrated or described herein.

[0050] In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0051] As mentioned in the background, the annular blowout preventer in the related art is mainly composed of a shell, a top cover, a piston and a rubber core. When it is necessary to close the wellhead, the piston is pushed upward by a hydraulic device to compress the rubber core, so that the rubber core is deformed to tightly wrap the drill pipe or other downhole tools, preventing high-pressure fluid from being sprayed out of the well.

[0052] However, the rubber core in the above-mentioned annular blowout preventer is made of rubber. As a high-elastic polymer material, rubber has good elasticity and flexibility, but it is easy to be permanently deformed or broken when subjected to continuous high pressure, which limits the pressure resistance of the rubber core. At the same time, the physical properties of rubber material are sensitive to temperature changes. Under high temperature conditions, the hardness, elasticity and pressure resistance of rubber will change, which will cause the high-pressure erosion resistance of the rubber core to decrease.

[0053] In addition, the rubber is exposed to the oxygen environment, which will cause oxidation reaction, leading to the rubber molecular chain rupture, thus reducing the elasticity and strength of the rubber, causing aging; meanwhile, the acid, alkali, oil and other chemicals in the drilling process will cause erosion to the rubber, further promoting its aging.

[0054] Therefore, the rubber core in the above-mentioned annular blowout preventer has poor compression resistance and is easy to age, and has low service life.

[0055] Therefore, the rubber core in the above-mentioned annular blowout preventer has poor compression resistance and is easy to age, and has low service life.

[0056] Thus, by setting at least three hard alloy blocks, the first sealing part and the second sealing part are used to make the hard alloy blocks fully contact each other to balance the stress, forming a stable sealing structure, and at the same time, a relatively complex and / or long sealing path can be constructed to block the two through holes, achieving a better sealing effect. The high-density structure of the hard alloy block has high hardness and strength, and good compression resistance; and the hard alloy block has good chemical inertness, strong resistance to ultraviolet rays, oxygen and the like in the natural environment, can avoid aging problems caused by chemical erosion, and is beneficial to prolong the service life of the whole sealing assembly.

[0057] Hereinafter, the present application will be described in detail in conjunction with the drawings and specific embodiments.

[0058] Referring to Figures 1 to 4 The annular blowout preventer provided by the embodiments of the present application comprises a housing member 100, a piston member 200 and a sealing assembly 300, the housing member 100 has a containing cavity 110 therein, and the opposite sides of the housing member 100 are both provided with through holes 120 which are in communication with the containing cavity 110; the piston member 200 is located in the containing cavity 110 and is used to lift between the two through holes 120; the sealing assembly 300 comprises at least three hard alloy blocks 310, and each hard alloy block 310 is in sliding connection with the piston member 200.

[0059] The hard alloy block 310 is provided with a first sealing part 3141 and a second sealing part 3142, the first sealing part 3141 is arranged towards the adjacent hard alloy block 310, and the second sealing part 3142 is arranged away from the piston piece 200; each hard alloy block 310 is configured to be brought together or away from each other under the driving of the lifting of the piston piece 200; when brought together, each adjacent first sealing part 3141 abuts, and each second sealing part 3142 abuts or is used to jointly hold the drill pipe in the well control system passing through the through hole 120, so as to block the two through holes 120; when brought away from each other, the first sealing part 3141 and the second sealing part 3142 slide with the corresponding hard alloy block 310 to communicate the two through holes 120.

[0060] In the present application, the annular blowout preventer is arranged in the well to be drilled, and can seal the wellhead of the empty well to be drilled, or can seal the wellhead of the well to be drilled in which the drill pipe or other downhole tool is arranged, and the present application does not limit this.

[0061] Specifically, the shell piece 100 is used as the basic bearing structure of the entire annular blowout preventer, and is used to accommodate the piston piece 200 and the sealing assembly 300, and provides an external connection interface.

[0062] Here, the external connection interface can be arranged according to actual use requirements. For example, the external connection interface includes a flange interface, and when the annular blowout preventer is arranged in the well to be drilled, the shell piece 100 is tightly connected with the wellhead device (such as a casing head, a four-way cross, etc.) through the flange; the external connection interface can also include a pressure gauge interface or a pressure relief valve interface, so that a pressure sensor or a manual / automatic pressure relief device can be installed, the change of the pressure in the well is monitored in real time, and the excessively high pressure is rapidly released when necessary, so as to protect the equipment and personnel safety; or the piston piece 200 can realize the lifting action through the power provided by the hydraulic device. An interface for connecting the hydraulic pipeline is arranged on the shell piece 100, so that the hydraulic oil can be introduced into the accommodation cavity 110 to push the piston piece 200 to lift. In this way, the operator can remotely control the annular blowout preventer to be closed or opened, and the safety and efficiency of the operation are improved.

[0063] The piston piece 200 is used as a driving element, and is used to realize the gathering and separation actions of each hard alloy block 310 in the sealing assembly 300. In actual application, the piston piece 200 is lifted to change from the position shown in FIG. 2A to the position shown in FIG. 2B, so that each hard alloy block 310 is gathered, that is, the piston piece 200 moves in the well towards the wellhead, and the moving direction is opposite to the direction of gravity; the piston piece 200 is lowered to change from the position shown in FIG. 2B to the position shown in FIG. 2A, so that each hard alloy block 310 is separated. Figure 3 Figure 4 The piston piece 200 is used as a driving element, and is used to realize the gathering and separation actions of each hard alloy block 310 in the sealing assembly 300. In actual application, the piston piece 200 is lifted to change from the position shown in FIG. 2A to the position shown in FIG. 2B, so that each hard alloy block 310 is gathered, that is, the piston piece 200 moves in the well towards the wellhead, and the moving direction is opposite to the direction of gravity; the piston piece 200 is lowered to change from the position shown in FIG. 2B to the position shown in FIG. 2A, so that each hard alloy block 310 is separated. Figure 4 Figure 3 ​​The position shown, the hard alloy blocks 310 are separated, that is, the piston 200 moves away from the wellhead, the moving direction is the direction of gravity.

[0064] By setting the number of hard alloy blocks 310 to at least three, for example, the number of hard alloy blocks 310 can be three, four, five, six, or eight, etc. Among them, by abutting each adjacent first sealing part 3141, abutting each second sealing part 3142, or being used to jointly hold the drill pipe (not shown in the figure) in the well control system passing through the through hole 120, the hard alloy blocks 310 can be in sufficient contact to balance the stress, forming a stable sealing structure, and at the same time, a more complex and / or longer path sealing path is constructed. In this way, on the basis of the advantage of the hard alloy block 310 having high pressure resistance, the hard alloy block 310 can form a multi-stage buffer under high pressure in the well through structural optimization, and when the mud washes the sealing assembly 300, the mud needs to pass through more complex gaps to leak, thereby reducing the risk of mud leakage, so that the sealing assembly 300 can realize stable and better sealing effect on the wellhead.

[0065] Exemplarily, when the annular blowout preventer is applied to an empty well, each hard alloy block 310 can be provided as a same triangular wedge structure, and the inclined planes on the opposite sides of the hard alloy block 310 can be the first sealing part 3141, and the straight side of the hard alloy block 310 can be the second sealing part 3142. In this way, when each hard alloy block 310 is gathered together, the sealing assembly 300 as a whole presents a block structure of a column, and each hard alloy block 310 can be in sufficient contact to balance the stress, forming a stable sealing structure; at the same time, by abutting each adjacent first sealing part 3141, abutting each second sealing part 3142, a sealing line located on at least three different radii of the sealing assembly 300 is formed, so as to construct a more complex sealing path.

[0066] It can be understood that when the annular blowout preventer is applied to a well with a drill pipe, the drill pipe is a cylindrical rod body, and each second sealing part 3142 can be provided as an arc surface with consistent curvature. When each hard alloy block 310 is gathered together, each arc surface surrounds a circular groove matched with the cylindrical rod body, and the circular groove communicates with two through holes 120 on the housing 100, and the groove wall of the circular groove is tightly fitted with the peripheral wall of the cylindrical rod body. In this way, by tightly fitting each arc surface with the peripheral surface of the drill pipe, each second sealing part 3142 forms a state of jointly holding the drill pipe, thereby blocking the two through holes 120.

[0067] Alternatively, on the basis of the above, the hardness of the hard alloy block 310 is higher than that of the drill rod, and fine protruding threads can also be arranged on the arc surface. In this way, when the hard alloy blocks 310 are gathered together and the arc surfaces form a circular groove matching the cylindrical rod body, the fine protruding threads can be actively embedded into the drill rod, so that the groove wall of the circular groove and the circumferential wall of the cylindrical rod body can be more closely matched.

[0068] In actual application, the first sealing part 3141 and the second sealing part 3142 can be precisely machined to ensure that the fit of each first sealing part 3141 is high, and each second sealing part 3142 can fully embrace the drill rod to improve the sealing effect.

[0069] The hard alloy block 310 of the embodiment of the application can include at least one of tungsten carbide-based hard alloy, titanium carbide-based hard alloy, titanium nitride-based hard alloy, and titanium aluminum carbonitride-based hard alloy.

[0070] Among them, the tungsten carbide-based hard alloy has excellent hardness and compression resistance; the titanium carbide-based hard alloy has high heat resistance, oxidation resistance and low friction coefficient; the titanium nitride-based hard alloy has high hardness and excellent corrosion resistance and low friction coefficient. The titanium aluminum carbonitride-based hard alloy combines the advantages of titanium carbide, titanium nitride and aluminum, providing extremely high hardness, wear resistance and good high temperature stability.

[0071] Further, the performance of the hard alloy block 310 can also be optimized by combining tungsten carbide-based hard alloy and titanium carbide-based hard alloy. For example, the composite method can be to construct a double-layer or multi-layer structure, wherein the outer layer uses titanium carbide-based hard alloy to take advantage of its low friction coefficient and excellent oxidation resistance, thereby reducing wear and improving corrosion resistance; and the inner layer uses tungsten carbide-based hard alloy to provide a solid support foundation with its high hardness and high strength, ensuring the stability and compression resistance of the overall structure of the hard alloy block 310.

[0072] In addition, gradient functional material technology can also be applied to realize a smooth transition from a core area rich in tungsten carbide to a surface layer rich in titanium carbide inside the hard alloy block 310, which can ensure the solidity of the internal structure and optimize the surface properties to adapt to complex working conditions. Alternatively, titanium carbide particles can be added to a matrix mainly composed of tungsten carbide through a particle reinforced composite material method, and the performance of the hard alloy block 310 can be customized by adjusting the proportion of titanium carbide particles, such as increasing the hardness while maintaining a certain toughness, so as to obtain a hard alloy block 310 with excellent wear resistance, oxidation resistance and high strength.

[0073] In summary, the annular blowout preventer in the embodiment of the application has at least three hard alloy blocks 310, and the first sealing part 3141 and the second sealing part 3142 are used to make the hard alloy blocks 310 fully contact each other to balance the stress and form a stable sealing structure. Meanwhile, a relatively complex and / or long sealing path is constructed to block the two through holes 120 and achieve a better sealing effect. The high-density structure of the hard alloy block 310 has high hardness and strength and good compression resistance. The hard alloy block 310 has good chemical inertness and strong resistance to ultraviolet rays and oxygen in the natural environment, which can avoid aging problems caused by chemical corrosion and is conducive to prolonging the service life of the sealing assembly 300 as a whole.

[0074] Referring to Figures 2 to 6 In some embodiments, the number of hard alloy blocks 310 is at least four. Each adjacent first sealing part 3141 abuts to form at least four first sealing lines 301, which extend obliquely along the extension direction of the corresponding hard alloy block 310. Each second sealing part 3142 abuts to form a second sealing line 302 extending along the diameter direction of the through hole 120 to block the two through holes 120.

[0075] In this way, when the annular blowout preventer seals the wellhead of the empty well, the second sealing line 302 and the at least four first sealing lines 301 increase the contact area between the hard alloy blocks 310 and form a more stable sealing structure. The sealing assembly 300 has a complex multi-sealing path in the limited space of the accommodating cavity 110, which reduces the phenomenon of mud leakage between adjacent hard alloy blocks 310 and maintains the stable sealing performance of the sealing assembly 300.

[0076] Hereinafter, the number of hard alloy blocks 310 is eight.

[0077] As Figure 6 shown, when the eight hard alloy blocks 310 are gathered together, the first sealing part 3141 on each hard alloy block 310 is an inclined plane extending along the extension direction of the hard alloy block 310, and the first sealing parts 3141 on the hard alloy blocks 310 are tightly fitted to form a closed annular solid. The second sealing part 3142 of the two hard alloy blocks 310 arranged along the X direction is two identical planes that abut each other. The second sealing parts 3142 of the two hard alloy blocks 310 adjacent to the same side of the two hard alloy blocks 310 arranged along the X direction are two identical planes that abut each other. The two hard alloy blocks 310 arranged along the Y direction have a triangular wedge structure, and the corresponding second sealing part 3142 is a straight line. In this way, the second sealing lines 302 extending along the diameter direction of the through hole 120 are formed by the abutment of the second sealing parts 3142, i.e., the second sealing lines 302 extend along the Y direction shown in the figure.

[0078] Overall, the sealing assembly 300 is configured with eight positionally staggered sealing paths, so that the mud is not easy to leak out from the wellhead through the sealing assembly 300, reducing the risk of mud leakage.

[0079] Among them, the two hard alloy blocks 310 arranged along the Y direction can generate radial extrusion force in the annular array through the wedge-shaped profile, compressing the contact pressure of the second sealing part 3142 of the corresponding adjacent two hard alloy blocks 310, which is beneficial to improve the overall structural stability and sealing performance of the sealing assembly 300.

[0080] Here, it can be understood that through the formed first sealing line 301 and the second sealing line 302, the contact pressure on the hard alloy block 310 can be evenly dispersed, and under the action of external force of mud scouring, it can be balanced Stress concentration is not easy to occur, which can effectively block the mud channel between the two through holes 120 and prevent the leakage of mud in the well.

[0081] It should be noted that when the number of hard alloy blocks 310 is 4, 5, 6, etc., the specific arrangement and structural design can be adaptively set according to the above manner, and the present application will not be described here.

[0082] It should also be noted that in some examples, the first sealing part 3141 can include a beveled flat section and at least one insertion section disposed on the beveled flat section. Among them, the insertion section in one of the two adjacent first sealing parts 3141 is a protrusion, and the insertion section in the other is a groove matched with the protrusion. In this way, the protrusion and the groove wall of the groove are matched by precision machining, and after the protrusion is inserted into the groove, the protrusion abuts and fits with the groove wall of the groove, so that the two flat sections are abutted, and the first sealing line 301 can also be formed.

[0083] Of course, Figure 6 When the second sealing part 3142 of the two hard alloy blocks 310 arranged along the X direction shown in the above-mentioned is abutted, the two second sealing parts 3142 are not limited to the same plane as described above, but can also be designed according to the above structure, as long as the two second sealing parts 3142 can be abutted and fitted to form the second sealing line 302, and the present application will not be described here.

[0084] In other examples, each second sealing part 3142 collectively forms a spiral tooth (not shown in the figure), which spirally extends along the axial direction of the through hole 120, and is used to match and insert with the spiral tooth groove on the side of the drill pipe, so that each second sealing part 3142 collectively clamps the drill pipe; To block the two through holes 120.

[0085] Therefore, when the annular preventer is applied to a scene in which the well has a drill pipe, the helical teeth are matched and inserted into the helical tooth grooves on the drill pipe, which helps to increase the friction coefficient between the second sealing portions 3142 and the drill pipe, enhances the friction force between the second sealing portions 3142 and the drill pipe, prevents the drill pipe from sliding, forms a more compact sealing interface, and thus ensures that the sealing assembly 300 can normally block the two through holes 120 and has a good sealing effect.

[0086] Referring to Figure 1 、 Figure 3 and Figure 4 , in some examples, the annular preventer further includes a first sleeve 400, the piston member 200 is slidably sleeved on the first sleeve 400, and the first sleeve 400 is coaxially arranged with the through hole 120; the side of the piston member 200 facing the first sleeve 400 has a first inclined surface 211, and the side of the hard alloy block 310 facing the piston member 200 has a second inclined surface 311; the hard alloy block 310 has a first side 312 and a second side 313 opposite to each other, the first side 312 is in abutment with the first sleeve 400, and the second side 313 is in abutment with the inner wall of the housing member 100.

[0087] The second inclined surface 311 is configured to slide along the first inclined surface 211 under the driving of the lifting of the piston member 200, so as to move the corresponding hard alloy block 310 towards or away from the axis of the through hole 120, and make the hard alloy blocks 310 gather or move away from each other.

[0088] Therefore, the piston member 200 is provided with additional guiding support by the first sleeve 400, so as to avoid deviation or inclination during lifting. By arranging the first side 312 in abutment with the first sleeve 400 and the second side 313 in abutment with the inner wall of the housing member 100, the second inclined surface 311 slides along the first inclined surface 211 under the driving of the lifting of the piston member 200, so as to form a stable three-sided limiting structure for the hard alloy block 310, ensure smooth movement and controllable trajectory of the hard alloy block 310, guide the hard alloy block 310 to move along a predetermined path, and make the hard alloy blocks 310 gather or move away from each other more accurately.

[0089] Specifically, the annular preventer is in a position state as shown in Figure 3 in the well to be drilled, Figure 3 wherein the Z direction represents the direction of gravity. Among them, the two sides of the housing member 100, i.e. the two sides of the housing member 100 along the Z direction, and the first side 312 of the hard alloy block 310 is below the second side 313 along the Z direction.

[0090] Exemplarily, the piston piece 200 is sleeved on the first sleeve 400, and the piston piece 200 is arranged between the first sleeve 400 and the circumferential cavity wall of the accommodating cavity 110, so that the freedom of the piston piece 200 in the non-lifting direction is limited by the first sleeve 400 and the circumferential cavity wall of the accommodating cavity 110, the stability of the lifting of the piston piece 200 is ensured, and the phenomenon that the sealing assembly 300 is out of synchronization, is stuck or is abnormally worn is avoided due to the deflection and swing of the piston piece 200. The first sleeve 400 can be made of wear-resistant material to prolong the service life.

[0091] In a specific implementation, the first inclined surface 211 is a conical surface, and the second inclined surface 311 is an inclined surface matched with the conical surface.

[0092] In this way, the lifting movement of the piston piece 200 can be efficiently converted into the radial movement of the hard alloy block 310 through the matching structure of the conical surface and the inclined surface; each hard alloy block 310 is matched with the same conical surface, which is beneficial to the synchronous movement and uniform force of each hard alloy block 310; the conical surface has a large contact area, which is helpful to disperse the pressure and reduce local wear.

[0093] Exemplarily, as shown in Figure 3 and Figure 4 , the conical cavity surrounded by the conical surface has a small-diameter end and a large-diameter end; the piston piece 200 is sleeved on the first sleeve 400, so that the first sleeve 400 is arranged in the conical cavity, and the barrel diameter of the first sleeve 400 matches the small-diameter end. Overall, the piston piece 200 is located outside the first sleeve 400, and the shell piece 100 is located outside the piston piece 200, so that the piston piece 200 is arranged between the first sleeve 400 and the circumferential cavity wall of the accommodating cavity 110.

[0094] When the piston piece 200 rises, since the first side 312 of the hard alloy block 310 is attached to the first sleeve 400 and the second side 313 is attached to the inner wall of the shell piece 100, the hard alloy block 310 is formed by the shell piece 100 and the first sleeve 400 to form a rigid position in the up-down direction, so as to completely constrain the axial displacement of the hard alloy block 310; at the same time, the sliding piece 600 drives the hard alloy block 310 to move on the sliding groove 212, which makes the movement trend of the hard alloy block 310 away from the large-diameter end and close to the small-diameter end. Therefore, the lifting movement of the piston is converted into the radial displacement of the hard alloy block 310 through the sliding matching of the conical surface and the inclined surface, so that the hard alloy block 310 moves towards the axis of the through hole 120, and the hard alloy blocks 310 are gathered together, so that the hard alloy block 310 can normally move away from the large-diameter end and close to the small-diameter end.

[0095] Correspondingly, when the piston 200 descends, the sliding member 600 drives the hard alloy blocks 310 to move on the sliding groove 212, so that the hard alloy blocks 310 tend to move close to the large-diameter end and away from the small-diameter end, and the lifting movement of the piston is converted into the radial displacement of the hard alloy blocks 310 through the sliding fit of the conical surface and the inclined surface, so that the hard alloy blocks 310 move away from the axis of the through hole 120, and the hard alloy blocks 310 are urged to move away from each other, thereby ensuring that the hard alloy blocks 310 can normally move close to the large-diameter end and away from the small-diameter end.

[0096] Referring to Figure 1 , Figure 4 and Figure 7 In some embodiments, the first sleeve 400 includes a sleeve portion 410 and a limiting portion 420; the piston 200 is sleeved on the sleeve portion 410; the limiting portion 420 is connected with the sleeve portion 410, and is arranged around the circumference of the sleeve portion 410; and the limiting portion 420 is configured to abut against the piston 200 when the hard alloy blocks 310 are close to each other.

[0097] In this way, the first sleeve 400 abuts against the piston 200 through the limiting portion 420 to mechanically limit the piston 200 from continuing to ascend, so that the piston 200 has better movement accuracy.

[0098] It can be understood that the limiting portion 420 abuts against the piston 200, i.e., the limiting portion 420 contacts the first inclined surface 211; by processing the surface of the limiting portion 420 that is in contact with the first inclined surface 211 to match the first inclined surface 211, it is ensured that the piston 200 can be more fully in contact with the limiting portion 420 after lifting, thereby achieving the stability of mechanical limiting; at the same time, the contact area is designed to be smoothly transitioned, which can avoid local stress concentration and ensure the positioning accuracy of the position of the piston 200 moving upward.

[0099] Referring to Figures 3 to 6 In a specific example, the annular blowout preventer further includes at least three sliding members 600, which are connected with the hard alloy blocks 310 one by one; the circumference of the piston 200 is spaced apart to be provided with at least three sliding grooves 212, which are located on the first inclined surface 211; and the sliding members 600 are arranged in the sliding grooves 212 one by one, and are configured to move along the extension direction of the sliding grooves 212 when the piston 200 ascends or descends.

[0100] In this way, the sliding piece 600 is embedded in the sliding groove 212 to form a stable connection mode, which can avoid the offset or falling of the hard alloy block 310 due to uneven stress, and ensure the stable operation of the sealing assembly 300 when transient high pressure or vibration is encountered during drilling. At the same time, the cooperation of the sliding piece 600 and the sliding groove 212 simplifies the disassembly and assembly between the hard alloy block 310 and the piston piece 200, and facilitates the operator to replace any hard alloy block 310.

[0101] Further, through the cooperation of the sliding groove 212 and the sliding piece 600, the wear between the hard alloy block 310 and the piston piece 200 during sliding can be reduced, the hard alloy block 310 is guided to move along the set path, and the sealing failure problem caused by the offset or jamming of any hard alloy block 310 can be avoided.

[0102] It can be understood that the extension direction of the sliding groove 212 is consistent with the inclination direction of the first inclined surface 211.

[0103] In this way, the lifting movement of the piston piece 200 can be more directly converted into the radial movement of the hard alloy block 310, unnecessary energy loss can be reduced, and the movement efficiency of the hard alloy block 310 can be improved.

[0104] At the same time, the friction force received by the hard alloy block 310 when moving along the sliding groove 212 can be more uniformly distributed, the risk of local excessive wear can be reduced, and the service life can be prolonged. In addition, the hard alloy block 310 can be ensured to remain stable during movement, the offset or jamming phenomenon can be reduced, and the action accuracy of the piston piece 200 and the hard alloy block 310 as a whole can be improved.

[0105] In some embodiments, the sliding piece 600 includes a sliding block connected with the corresponding hard alloy block 310, and the sliding block is arranged in the sliding groove 212; or,

[0106] The sliding piece 600 includes a second sliding block 610 and a pin shaft 620 arranged in the sliding groove 212, the second sliding block 610 is connected with the corresponding hard alloy block 310, the second sliding block 610 is provided with a insertion hole, the pin rod 6212 of the pin shaft 620 is inserted into the insertion hole, so that the pin shaft cap 6211 of the pin shaft 620 is in contact with one side of the second sliding block 610, the pin rod 6212 and the other side of the second sliding block 610 are provided with a groove 6213, the groove 6213 is provided with a snap spring 6221, the snap spring 6221 is sleeved with a grommet 6222, and the grommet 6222 is in contact with the other side of the second sliding block 610.

[0107] When the sliding member 600 includes the sliding block, the inner groove walls on both sides of the slot can provide the sliding block with limiting and guiding effects, preventing the first sliding block from falling out or being stuck, and improving the reliability of the assembly of the hard alloy block 310 and the piston.

[0108] Illustratively, by setting the sliding block in the sliding slot 212, when the piston is lowered, the sliding slot 212 exerts a vertical slot direction pulling force on the sliding block, prompting the sliding block to move along the sliding slot 212 to an obliquely upward direction, and the hard alloy block 310 is limited by the inner wall of the first sleeve 400 and the housing member 100 to move horizontally outward, i.e., away from the axis of the through hole 120. In this way, the hard alloy block 310 can be made to have a movement trend of approaching the large-diameter end and moving away from the small-diameter end of the piston as mentioned above.

[0109] When the sliding member 600 includes the second sliding block 610 and the pin shaft 620, the pin shaft 620 and the sliding slot 212 perform rolling friction to reduce the friction coefficient between them and reduce local fatigue damage of the pin shaft 620 and the sliding slot 212 caused by long-term sliding; at the same time, the hard alloy block 310 is more easily moved, thereby facilitating the reduction of the driving force required for the lifting of the piston member 200, and making the overall use of the annular preventer more efficient.

[0110] Further, during the movement of the hard alloy block 310 and the sliding of the second inclined surface 311 along the first inclined surface 211, the pin shaft 620 in the sliding slot 212 bears a shearing load, and the pin shaft 620 is prevented from moving axially by the cotter 6221 and the spacer ring 6222, thereby avoiding the deviation or falling of the second sliding block 610 during the synchronous movement of the second sliding block 610 in the sliding slot 212, so that the pin shaft 620 as a whole can better position the second sliding block 610.

[0111] Referring to Figure 1 , Figure 3 and Figure 4 , in some examples, the support assembly further includes a second sleeve 500, the second sleeve 500 is located in the accommodation cavity 110, and the first sleeve 400 is located in the second sleeve 500, the second sleeve 500 is coaxially arranged with the first sleeve 400; the piston member 200 is in sliding connection with the second sleeve 500.

[0112] In this way, the second sleeve 500 provides limiting and auxiliary support for the piston member 200, and the double-sleeve structure formed by the second sleeve 500 and the first sleeve 400 provides a wider support surface and double guiding for the piston member 200, which facilitates the lifting action of the piston member 200 to be more stable and reliable.

[0113] Illustratively, the coaxial arrangement of the second sleeve 500 and the first sleeve 400 can ensure the structural symmetry of the annular preventer as a whole and the consistency of the action of the piston member 200 driving each hard alloy block 310.

[0114] Referring to Figure 1 and Figure 10 , in a specific implementation, the piston member 200 includes a fitting portion 210 and a sliding portion 220 connected with the outer peripheral wall of the fitting portion 210; the inner peripheral wall of the fitting portion 210 forms a first inclined surface 211, the fitting portion 210 is slidingly sleeved on the first sleeve 400, and the sliding portion 220 is slidingly connected with the second sleeve 500.

[0115] In this way, the hard alloy block 310 is driven to move by the fitting portion 210, and the sliding portion 220 is matched with the second sleeve 500 to realize guiding, so that the structural design of the piston member 200 is more reasonable.

[0116] The fitting portion 210 can be a conical structure, and the sliding portion 220 can be designed as an annular structure as shown in Figure 9 .

[0117] Exemplarily, the fitting portion 210 and the sliding portion 220 can be integrally formed. The integrally formed process refers to a molding process of completing the entire component at one time in one mold. Compared with a traditional step-by-step manufacturing process, integrally forming can simplify the manufacturing process, and has high precision, high production efficiency and low production cost. In this way, integrally forming the fitting portion 210 and the sliding portion 220 can avoid the problem of loose connection between the two, and prevent the occurrence of gaps between the two to affect the structural strength of the piston member 200.

[0118] Further, integrally forming can avoid the connection between the fitting portion 210 and the sliding portion 220 and the additional processing process, which is beneficial to improve the production efficiency and reduce the production cost.

[0119] Referring to Figure 1 , Figure 10 and Figure 11 , in a specific example, the sliding portion 220 includes a sliding segment 221 and a contact segment 222; the sliding segment 221 is connected with the outer peripheral wall of the fitting portion 210, a sliding cavity 2211 with one side opening 2212 is formed on the sliding segment 221, the sliding cavity 2211 is matched with the second sleeve 500, and the sliding segment 221 is slidingly inserted on the second sleeve 500 through the sliding cavity 2211; the contact segment 222 is connected with the sliding segment 221, and the contact segment 222 is located between the sliding segment 221 and the peripheral side cavity wall of the accommodating cavity 110.

[0120] The contact segment 222 is configured to be in contact with the hydraulic oil when the hydraulic device in the well control system injects the hydraulic oil into the accommodating cavity 110, so as to drive the sliding segment 221 to slide relative to the second sleeve 500 under the pushing of the hydraulic oil, and make the fitting portion 210 ascend and descend.

[0121] Thus, the piston piece 200 is more responsive to hydraulic pressure and more sensitive to starting lifting action by bearing the hydraulic oil pressure through the contact section 222. The sliding section 221 forms a stable sliding guide structure with the second sleeve 500 through the sliding cavity 2211, which can ensure smooth lifting of the piston piece 200.

[0122] As shown in Figure 10 and Figure 11 , the sliding section 221 can be a ring-shaped housing structure, and the contact section 222 is a ring-shaped plate structure.

[0123] When the piston piece 200 is lifted, the accommodating cavity 110 can be divided into the first sub-accommodating cavity 111 and the second sub-accommodating cavity 112 with adjustable volumes through the contact section 222. The first sub-accommodating cavity 111 is above the second sub-accommodating cavity 112 along the Z direction as shown in Figure 1 . Thus, when the piston piece 200 needs to be driven to rise, the hydraulic oil is injected into the second sub-accommodating cavity 112 through the hydraulic device to raise the liquid level of the hydraulic oil in the second sub-accommodating cavity 112 to push the contact section 222 to drive the sliding section 221 to slide upward relative to the second sleeve 500, so that the piston piece 200 is changed from the position shown in Figure 3 to the position shown in Figure 4 . When the piston piece 200 needs to be driven to descend, the hydraulic oil is injected into the first sub-accommodating cavity 111 through the hydraulic device to raise the liquid level of the hydraulic oil in the first sub-accommodating cavity 111 to push the contact section 222 to drive the sliding section 221 to slide downward relative to the second sleeve 500, so that the piston piece 200 is changed from the position shown in Figure 4 to the position shown in Figure 3 .

[0124] Referring to Figure 1 , Figure 5 , Figure 6 and Figure 12 , in some examples, the housing piece 100 includes a housing part 101 and a cover part 102 detachably arranged on the housing part 101; the housing part 101 and the cover part 102 jointly enclose the accommodating cavity 110, and the housing part 101 and the cover part 102 are both provided with a through hole 120; the cover part 102 has an abutting part 1021 on the side facing the housing part 101, the abutting part 1021 is in communication with the through hole 120, and the side of the abutting part 1021 away from the cover part 102 is used to be attached to the second side 313; the circumferential side of the abutting part 1021 has a third inclined surface 1022 matched with the first inclined surface 211, and the third inclined surface 1022 is used to abut against part of the first inclined surface 211 when the hard alloy blocks 310 are gathered together.

[0125] In this way, the operator can easily remove the cover setting part 102 to perform maintenance and replacement of the hard alloy blocks 310 and the piston member 200 in the accommodating cavity 110, and the maintenance efficiency is higher; meanwhile, the assembly efficiency of the operator for the annular blowout preventer as a whole is improved.

[0126] In combination Figure 4 As shown, when the piston rises, the hard alloy blocks 310 are gathered together, and the third inclined surface 1022 on the periphery of the abutting part 1021 abuts against the part of the first inclined surface 211 of the piston member 200, so as to form a rigid stop for the piston member 200, and the piston member 200 is limited to continue to rise, and the piston member 200 has better movement precision.

[0127] Specifically, the third inclined surface 1022 is a conical surface, and the abutting part 1021 can be a circular truncated cone, and the arc-shaped inclined surface on the periphery of the circular truncated cone is the third inclined surface 1022. The circular truncated cone structure is simple and convenient to manufacture; the cover setting part 102 and the abutting part 1021 can be integrally formed to ensure better connection reliability therebetween.

[0128] In specific implementation, during the lifting of the piston member 200, the first side 312 of the hard alloy block 310 is in sliding contact with the first sleeve 400, and the second side 313 is in sliding contact with the inner wall of the housing member 100, in order to reduce the abrasion of the hard alloy block 310, in some examples, the first side 312 is coated with a wear-resistant coating.

[0129] In this way, the first side 312 and the second side 313 of the hard alloy block 310 are subjected to surface strengthening treatment, which is beneficial to reduce the abrasion of the hard alloy block 310 and improve the service life of the hard alloy block 310.

[0130] For example, the wear-resistant coating includes at least one of tungsten carbide, titanium nitride, aluminum titanium nitride, and titanium carbonitride.

[0131] The tungsten carbide has high hardness and wear resistance, can meet the application requirements of high friction conditions; the titanium nitride has good oxidation resistance, low friction coefficient, and excellent thermal stability; the aluminum titanium nitride has good high-temperature resistance and is suitable for high-temperature operating environments; the titanium carbonitride has good comprehensive hardness and toughness, and has wear resistance and impact resistance.

[0132] The embodiment of the present application also provides a well control system, which includes a system body and an annular blowout preventer as in any of the above embodiments arranged on the system body.

[0133] The system body comprises a drill pipe and a hydraulic device (not shown in the figure); the annular blowout preventer is arranged in the well, the drill pipe passes through two through holes 120 on the shell member 100 of the annular blowout preventer in sequence to be partially located in the well; the hydraulic device is used for injecting hydraulic oil into the accommodating cavity 110 of the shell member 100 to lift the piston member 200, and each hard alloy block 310 of the annular blowout preventer is used for gathering together to embrace the drill pipe or moving away from each other to open the wellhead of the well under the driving of the lifting of the piston member 200.

[0134] The overall structure and working principle of the annular blowout preventer are the same as those in the foregoing embodiments, and details are not described herein.

[0135] The well control system of the embodiment of the application is used for maintaining the balance between the bottom hole pressure and the formation pressure by controlling the drilling fluid density, the annular pressure, the annular blowout preventer action and the like.

[0136] As described above, the shell member 100 is provided with an interface connected with a hydraulic pipeline of the hydraulic device, so that the hydraulic device can guide the hydraulic oil into the accommodating cavity 110 through the hydraulic pipeline to drive the piston member 200 to lift.

[0137] Further, the drill pipe is a cylindrical rod body, and the second sealing portions 3142 of each hard alloy block 310 can be provided as arc surfaces with consistent radii. When each hard alloy block 310 gathers together, each arc surface encloses a circular groove matched with the cylindrical rod body, and the circular groove is in communication with the two through holes 120 on the shell member 100, and the groove wall of the circular groove is tightly fitted with the circumferential side wall of the cylindrical rod body. In this way, each second sealing portion 3142 is tightly fitted with the circumferential side of the drill pipe to form a state of collectively embracing the drill pipe, thereby blocking the two through holes 120.

[0138] Alternatively, on the basis of the above, the hardness of the hard alloy block 310 is higher than that of the drill pipe, and the arc surface can be further provided with a small protruding thread. In this way, when each hard alloy block 310 gathers together to enclose a circular groove matched with the cylindrical rod body with each arc surface, the small thread can be actively embedded into the drill pipe to make the groove wall of the circular groove more tightly fitted with the circumferential side wall of the cylindrical rod body.

[0139] Of course, in other examples, the drill pipe has a helical tooth groove matched with the helical teeth enclosed by the second sealing portions 3142 of each hard alloy block 310, and when each hard alloy block 310 gathers together, the helical tooth groove on the circumferential side of the drill pipe is inserted with the helical teeth to make each second sealing portion 3142 collectively embrace the drill pipe; meanwhile, the first sealing portions 3141 of each adjacent hard alloy block 310 abut and fit to form at least three first sealing lines 301, thereby blocking the two through holes 120 to close the wellhead of the well.

[0140] The hydraulic device is used to provide power drive for the annular blowout preventer, can support remote operation, and ensure quick response to emergencies. It should be noted that the specific structure of the hydraulic device can be designed according to the prior art, and the embodiments of the present application will not be described here.

[0141] Exemplarily, the system body can further include a drilling fluid circulating device, a ram blowout preventer, a well killing and choke manifold device, and a monitoring feedback device; the drilling fluid circulating device is used to prepare and circulate the drilling fluid with a specific density, and to control the bottom hole pressure by adjusting the mud weight; the annular blowout preventer and the ram blowout preventer are used to quickly shut in when overflow or well kick occurs, to prevent blowout out of control; the well killing and choke manifold is connected to the annular blowout preventer and the ram blowout preventer, and is used to implement blowout control or well killing operation under the closed well condition, to restore the pressure balance in the well; the monitoring feedback device can be used to collect parameters such as wellhead standing pressure, casing pressure, mud pit liquid level, and gas concentration.

[0142] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An annular preventer, comprising: The application relates to a sealing assembly for a well control system, comprising: a housing piece, which has a containing cavity in the housing piece, and two through holes, which are communicated with the containing cavity and are located on opposite sides of the housing piece; a piston piece, which is located in the containing cavity and is used for lifting between the two through holes; a sealing assembly, which comprises at least three hard alloy blocks, each of which is in sliding connection with the piston piece, and has a first sealing part and a second sealing part, the first sealing part is arranged towards the adjacent hard alloy block, and the second sealing part is arranged away from the piston piece; each of the hard alloy blocks is configured to be gathered or separated from each other under the driving of the lifting of the piston piece; when gathered, each adjacent first sealing part abuts against each other, and each second sealing part is used for collectively holding a drill pipe in the well control system, so as to block the two through holes; when separated, the first sealing part and the second sealing part slide along the corresponding hard alloy block, so as to communicate the two through holes; the number of the hard alloy blocks is at least four; each adjacent first sealing part abuts against each other, so as to form at least four first sealing lines, which are obliquely extended along the extension direction of the corresponding hard alloy block; each second sealing part collectively forms a helical tooth, which is helically extended along the axial direction of the through hole, and is used for being matched and inserted into a helical tooth groove on the lateral side of the drill pipe, so that each second sealing part collectively holds the drill pipe, so as to block the two through holes.

2. An annular preventer according to claim 1, wherein, a first sleeve is further included, the piston piece is slidably sleeved on the first sleeve, and the first sleeve is coaxially arranged with the through hole; one side of the piston piece towards the first sleeve has a first inclined surface, one side of the hard alloy block towards the piston piece has a second inclined surface; the hard alloy block has opposite first and second sides, the first side is attached to the first sleeve, and the second side is attached to the inner wall of the housing piece; the second inclined surface is configured to slide along the first inclined surface under the driving of the lifting of the piston piece, so as to move the corresponding hard alloy block towards or away from the axis of the through hole, so that each hard alloy block is gathered or separated from each other.

3. An annular preventer according to claim 2, wherein, the first sleeve comprises: a sleeve part, in which the piston piece is slidably sleeved; a limiting part, which is connected with the sleeve part and is arranged around the circumference of the sleeve part, and is configured to abut against the piston piece when each hard alloy block is gathered.

4. The annular preventer of claim 2, wherein, at least three sliding pieces are further included, which are connected with the hard alloy blocks one by one; the circumference of the piston piece is spaced apart to form at least three sliding grooves, which are located on the first inclined surface; the sliding piece is arranged in the sliding groove one by one, and is configured to move along the extension direction of the sliding groove when the piston piece is lifted.

5. An annular preventer according to claim 4, wherein, the sliding piece comprises a sliding block, which is connected with the corresponding hard alloy block and is arranged in the sliding groove; or The sliding member comprises a second sliding block and a pin shaft in the sliding groove, the second sliding block is connected with the corresponding hard alloy block, a insertion hole is arranged on the second sliding block, a pin rod of the pin shaft is inserted into the insertion hole, so that a pin shaft cap of the pin shaft is in contact with one side of the second sliding block, a groove is arranged on the other side of the pin rod adjacent to the second sliding block, a clamping spring is arranged in the groove, a grommet is sleeved on the clamping spring, and the grommet is in contact with the other side of the second sliding block.

6. An annular preventer according to any one of claims 2 to 5, wherein, The second sleeve is coaxially arranged in the accommodating cavity, and the first sleeve is arranged in the second sleeve. The piston member is in sliding connection with the second sleeve.

7. An annular preventer according to any one of claims 2 to 5, wherein, The shell member comprises a shell part and a cover part which is detachably arranged on the shell part, the shell part and the cover part jointly form the accommodating cavity, and the shell part and the cover part are both provided with the through hole; The cover part is provided with an abutting part on the side facing the shell part, the abutting part is in communication with the through hole, the side of the abutting part away from the cover part is used to be attached to the second side, the circumferential side of the abutting part is provided with a third inclined surface matched with the first inclined surface, and the third inclined surface is used to abut against part of the first inclined surface when the hard alloy blocks are gathered.

8. An annular preventer according to any one of claims 3 to 5, wherein, The first side and the second side are both coated with a wear-resistant coating.

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