CN213684061U - Active sealing structure, rotary control head and non-rotary control head - Google Patents

Abstract

The application discloses initiative seal structure, rotating control head and non-rotating control head. The active sealing structure is applied to the sealing control head and comprises a shell assembly, a gluing core, an active compensation gluing core and a liquid injection channel. The housing assembly is formed with a bypass passage. The upper rubber core and the active compensation rubber core are arranged in the shell assembly at intervals along the axial direction of the shell assembly and used for sealing a drill rod penetrating through the shell assembly, and the active compensation rubber core is close to the bypass channel compared with the upper rubber core. The liquid injection channel is formed in the shell assembly and is configured to be connected with hydraulic equipment, and hydraulic pressure is applied to the upper rubber core and the active compensation rubber core, so that the upper rubber core and the active compensation rubber core are tightly held on the drill rod to form sealing. The technical scheme that this application provided can solve among the prior art because well head is middle to be influenced, oil base mud erosion action or long-time the serious wear of taking off the drilling to gluing the core and cause the problem of sealing failure.

Description

Active sealing structure, rotary control head and non-rotary control head

Technical Field

The application relates to the technical field of drilling, in particular to an active sealing structure, a rotary control head and a non-rotary control head.

Background

The sealing control head is arranged on the upper part of a flange of a blowout preventer group at a well head, and is underbalanced drilling and pressure control drilling equipment which plays a role in rotary sealing.

The existing sealing control head realizes sealing through interference fit of the rubber core and the drill rod. The rubber core is abraded due to the reasons of well head centering degree, mud performance, drill rod tripping and the like, so that a gap is generated between the rubber core and the drill rod, and sealing failure is caused.

SUMMERY OF THE UTILITY MODEL

The application provides an initiative seal structure, rotating control head and non-rotating control head, and it can solve among the prior art because the rubber core wearing and tearing are serious, causes the problem of passive sealing inefficacy.

In a first aspect, the utility model provides an initiative seal structure is applied to in the sealed control head, include:

a housing assembly formed with a bypass channel;

gluing a core;

the active compensation rubber core is arranged in the shell assembly at intervals along the axial direction of the shell assembly and used for sealing a drill rod penetrating through the shell assembly, and the active compensation rubber core is closer to the bypass channel than the upper rubber core; and

and the liquid injection channel is formed in the shell assembly, is configured to be connected with hydraulic equipment, and applies hydraulic pressure to the upper rubber core and the active compensation rubber core so that the upper rubber core and the active compensation rubber core are tightly held on the drill rod to form sealing.

In the implementation process, the sealing control head is arranged on the upper part of a flange of a blowout preventer stack at the wellhead and is equipment for operations such as underbalance drilling, pressure control drilling and the like; the drill rod penetrates through the top end of the shell assembly, passes through the upper rubber core and the active compensation rubber core and then goes into the bottom of the well to carry out downhole operation; when the hydraulic device works, high-pressure liquid is injected into the shell assembly through the liquid injection channel, the gluing core and the active compensation rubber core are deformed by hydraulic pressure and are folded inwards, so that the gluing core and the active compensation rubber core are tightly held on a drill rod to form sealing; it should be noted that, compared with the prior art, the technical scheme that the rubber core and the drill rod are sealed by interference fit, the active sealing structure provided in the application can seal the drill rod in time by adjusting the pressure acting on the upper active compensation rubber core, so that the accidents that the downhole liquid returns to the drilling platform surface and the bottom hole pressure is out of control due to the fact that the ground casing pressure is conducted to the bottom hole after the upper rubber core and the active compensation rubber core are worn and deformed are avoided.

In an alternative embodiment, the active compensation glue core comprises a first part and a second part which are connected with each other, and the second part is closer to the bypass channel than the first part;

the first part is provided with a first inclined surface which is in an outward expansion shape along the direction from the first part to the second part;

the second part is provided with a second inclined surface which is in a retraction shape along the direction from the first part to the second part.

In the implementation process, when the hydraulic equipment injects liquid into the liquid injection channel, high-pressure liquid acts on the first inclined surface, and under the guidance of the first inclined surface, acting force faces the interior of the active compensation rubber core, so that the first part deforms inwards, and the drill rod is tightly held to form sealing; meanwhile, when the downhole liquid returns from the downhole, the downhole liquid can smoothly flow out from the bypass channel under the guidance of the second inclined plane; meanwhile, the underground liquid acts on the second inclined surface, the acting force of the underground liquid faces the interior of the active compensation rubber core, and the second inclined surface is deformed inwards, so that the drill rod is tightly held to form sealing.

In an alternative embodiment, the first portion has an isosceles trapezoid cross-section and the second portion is mirror symmetric to the first portion.

In the implementation process, the section of the first part is in an isosceles trapezoid shape, so that the first part is uniformly stressed, and the active compensation rubber core is stably held tightly on the drill rod to form good sealing; meanwhile, when the first part and the second part are in mirror symmetry, namely when the cross section of the first part and the second part is in an upper and lower trapezoidal structure, and the hydraulic pressure applied to the first part by the hydraulic equipment is controlled to be consistent with the hydraulic pressure of the downhole liquid to the second part, the stress balance of the active compensation rubber core is facilitated, and the sealing property of the active compensation rubber core and the service life of the active compensation rubber core are ensured; meanwhile, it is required that the inner cavity of the active compensation rubber core with balanced stress is extended in an equal diameter manner so as to be beneficial to the stress balance of the active compensation rubber core.

In an optional embodiment, a third inclined surface is formed on one side of the upper rubber core, which is close to the active compensation rubber core, and the third inclined surface is in a retracted shape along the direction from the upper rubber core to the active compensation rubber core;

the liquid injection channel is positioned between the gluing core and the active compensation gluing core.

In the process of the realization, when the hydraulic equipment injects liquid to the liquid injection channel, part of high-pressure liquid acts on the active compensation rubber core, the other part acts on the upper rubber core, and under the guide of the third inclined plane, the acting force is towards the interior of the upper rubber core, so that the upper rubber core deforms inwards, and the holding drill rod forms a seal.

In an optional embodiment, the active sealing structure further comprises a hydraulic device, and the hydraulic device is connected with the liquid injection channel;

the hydraulic equipment comprises an air source device and a hydraulic cylinder device, wherein the air source device is connected with the hydraulic cylinder device and drives the hydraulic cylinder device to inject or discharge liquid into or out of the liquid injection channel.

In the process of above-mentioned realization, the mode of adoption gas thrust liquid pours into liquid into to annotating the liquid channel into, does benefit to glue the core and initiatively compensates and glues the core and hold tightly in the drilling rod fast, forms sealedly, and hydraulic equipment goes out the liquid simultaneously stably, does benefit to glue the core and initiatively compensates and glues and form stable sealed between core and the drilling rod, avoids down the well liquid to return to take place to leak when sealed control head and return to the rig floor face.

In a second aspect, the present invention provides a rotary control head having an active sealing structure according to any one of the preceding embodiments;

the shell assembly comprises a rotatable shell, a central pipe, a bearing device and a fixed shell;

the rotatable shell is connected with the central pipe, the central pipe is connected with the fixed shell through a bearing device, and the bypass channel is formed in the fixed shell;

the gluing core is arranged in the rotatable shell and can rotate along with the drill rod;

the active compensation rubber core is positioned in the fixed shell and is connected with the central tube;

the liquid injection channel is formed in the central pipe and provided with two outlets, and hydraulic pressure is applied to the active compensation rubber core and the upper rubber core through the two outlets respectively.

The in-process of above-mentioned realization, the drilling rod passes rotatable shell, the center tube, bearing arrangement and fixed shell, rotatable shell, the center tube, go up rubber core and initiative compensation and glue the core and all can follow the drilling rod rotation, in the drilling rod rotation, hydraulic equipment annotates the liquid to annotating the liquid passageway, it glues the core and receives hydraulic pressure and deformation with the initiative compensation, draw in to inside, thereby hold tightly and form sealedly in the drilling rod, when the drilling rod is rotatory, hydraulic equipment supplies the pressure continuously, guarantee to glue the core, the core is glued in the initiative compensation and provides stable sealed for the drilling rod.

In a third aspect, the present invention provides a non-rotating control head having an active sealing structure according to any of the preceding embodiments;

the gluing core and the active compensation glue core are fixed in the shell assembly, a first sealing cavity is formed between the gluing core and the active compensation glue core, and the liquid injection channel is communicated with the first sealing cavity.

In the implementation process, the drill rod penetrates through the shell assembly, the gluing core and the active compensation glue core, and the shell assembly, the gluing core and the active compensation glue core are kept fixed and do not rotate along with the drill rod; hydraulic equipment annotates the liquid to annotating the liquid passageway, and liquid gets into first sealed chamber, acts on simultaneously and glues the core and initiatively compensate and glue the core, glues the core and initiatively compensate and glue the core and receive hydraulic pressure and deformation, draws in to inside in to hold tightly and form sealedly in the drilling rod, when the drilling rod is rotatory, hydraulic equipment supplies the pressure continuously, guarantees to glue the core, initiatively compensate and glues the core and provide stable sealed for the drilling rod, avoids the occurence of failure that liquid was revealed in the pit.

In an alternative embodiment, the non-rotating control head comprises at least two active compensation rubber cores, wherein the at least two active compensation rubber cores are arranged at intervals along the axial direction of the shell assembly and are positioned between the bypass channel and the upper rubber core;

a second sealing cavity is formed between two adjacent active compensation rubber cores, and each second sealing cavity is provided with a liquid injection channel.

In the implementation process, the non-rotating control head is provided with a plurality of active compensation rubber cores, so that the sealing property of the non-rotating control head is facilitated, and the underground liquid is prevented from leaking when returning to the control head; two adjacent active compensation rubber cores are injected with liquid through the same liquid injection channel, so that the two active compensation rubber cores are stressed uniformly, and the active compensation rubber cores can be stably held tightly on the drill rod; meanwhile, when the active compensation rubber cores are of an upper trapezoid structure and a lower trapezoid structure, two adjacent active compensation rubber cores are under the action of hydraulic pressure in the same second sealing cavity, and the two active compensation rubber cores are favorably held tightly on the drill rod at the same time to form stable sealing.

In an alternative embodiment, the first and second sealed chambers are provided with pressure sensors.

In the process of realizing, the pressure sensors are arranged in the first sealing cavity and the second sealing cavity, so that the internal pressure can be obtained in time, and the pressure acting on the gluing core and the active compensation gluing core can be adjusted according to specific working conditions.

In an alternative embodiment, a lubricant is provided between the sizing and active compensation cores and the drill pipe.

Above-mentioned in-process of realizing can add emollient to the liquid of pouring into in annotating the liquid passageway into, makes it be used for between rubberizing core and the drilling rod, acts on between initiative compensation rubber core and the drilling rod, has reduced the drilling rod and the frictional force of the two, does benefit to the drilling rod and rotates smoothly, reduces the drilling rod because of gluing the wearing and tearing that the core caused with rubberizing core and initiative compensation rubber core long-time friction, prolongs the life of gluing the core.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

FIG. 1 is a schematic sealing diagram of an active sealing structure according to the present embodiment;

FIG. 2 is a schematic diagram of the active compensation rubber core in the present embodiment;

FIG. 3 is a schematic diagram of a rotary control head (ACD) in the present embodiment;

FIG. 4 is a schematic diagram of the rotary control head (ACD) in this embodiment;

FIG. 5 is a schematic diagram of the operation of the rotary control head (ACD) in the present embodiment;

FIG. 6 is a schematic diagram of a non-rotating control head (APCD) in the present embodiment;

FIG. 7 is a schematic diagram of the non-rotating control head (APCD) in operation according to the present embodiment;

FIG. 8 is a schematic diagram of the operation of a non-rotating control head (APCD) in this embodiment;

fig. 9 is a schematic view of another non-rotating control head (APCD) in the present embodiment.

Icon: 1A-a drill rod; 10-a housing assembly; 10 a-a bypass channel; 11-gluing a core; 12-active compensation rubber core; 13-a liquid injection channel; 14-a first part; 15-a second part; 16-a first bevel; 17-a second bevel; 18-a third bevel; 19-hydraulic equipment; 20-gas source means; 21-a hydraulic cylinder device; 22-a rotatable housing; 23-a central tube; 24-a bearing arrangement; 25-a stationary housing; 26-a first sealed cavity; 27-a second sealed chamber; 28-pressure sensor.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the embodiments of the present application, it is to be understood that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like, refer to the orientation or positional relationship as shown in the drawings, or as conventionally placed in use of the product of the application, or as conventionally understood by those skilled in the art, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore should not be considered as limiting the present application.

In the description of the embodiments of the present application, it should also be noted that, unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.

The technical solution in the present application will be described below with reference to the accompanying drawings.

The embodiment provides an initiative seal structure, and it can solve among the prior art because long-time tripping, leads to gluey core wearing and tearing serious, causes the problem of sealed inefficacy.

Referring to fig. 1, fig. 1 is a schematic sealing diagram of an active sealing structure in this embodiment.

The active sealing structure is applied to a sealing control head and comprises a shell assembly 10, an upper rubber core 11, an active compensation rubber core 12 and a liquid injection channel 13. The housing assembly 10 and the liquid injection channel 13 are not shown in fig. 1, and can be understood by referring to fig. 3 and 6.

The housing assembly 10 is formed with a bypass passage 10 a. The glue applying core 11 and the active compensation glue core 12 are disposed in the housing assembly 10 at an interval along the axial direction of the housing assembly 10, and are used for sealing the drill rod 1A passing through the housing assembly 10, and the active compensation glue core 12 is closer to the bypass channel 10a than the glue applying core 11. The liquid injection channel 13 is formed in the housing assembly 10, and is configured to be connected with a hydraulic device 19, and apply hydraulic pressure to the upper rubber core 11 and the active compensation rubber core 12, so that the upper rubber core 11 and the active compensation rubber core 12 are held tightly to the drill rod 1A to form a seal.

In the implementation process, the sealing control head is arranged on the upper part of a flange of a blowout preventer stack at the wellhead and is equipment for operations such as underbalance drilling, pressure control drilling and the like; the drill pipe 1A is penetrated from the top end of the housing assembly 10, passes through the upper rubber core 11 and the active compensation rubber core 12, and performs downhole operation, and downhole fluid flows out from the bypass channel 10a and is indicated by an arrow with a letter "v" in FIG. 1.

When the hydraulic device 19 works, high-pressure liquid is injected into the shell assembly 10 through the liquid injection channel 13, the upper rubber core 11 and the active compensation rubber core 12 are deformed by hydraulic pressure (indicated by an arrow and a letter P in figure 1) and are folded inwards, so that the upper rubber core 11 and the active compensation rubber core 12 are tightly held in the drill rod 1A to form sealing, when the drill rod 1A rotates, the hydraulic device 19 continuously supplies pressure to ensure that the upper rubber core 11 and the active compensation rubber core 12 provide stable sealing for the drill rod 1A, and downhole liquid is prevented from returning to a drilling platform surface and ground pressure is prevented from being unable to be transmitted to a well bottom; it should be noted that, compared with the technical scheme in the prior art that the rubber core and the drill rod 1A are sealed by interference fit, the active sealing structure provided in the present application can form a seal for the drill rod 1A in time by adjusting the pressure acting on the upper active compensation rubber core 12, so as to avoid the occurrence of accidents that the downhole liquid returns to the surface of the drill floor and the bottom hole pressure is out of control because the ground casing pressure cannot be conducted to the bottom hole after the upper rubber core 11 and the active compensation rubber core 12 are worn and deformed.

It should be noted that the active compensation rubber core 12 and the upper rubber core 11 are axisymmetric structures to ensure uniform pressure.

Referring to fig. 2, fig. 2 is a schematic diagram of the active compensation rubber core 12 in the present embodiment.

In the present disclosure, the active compensation rubber core 12 includes a first portion 14 and a second portion 15 connected to each other, and the second portion 15 is closer to the bypass channel 10a than the first portion 14.

The first portion 14 is formed with a first ramp 16, the first ramp 16 being flared in a direction from the first portion 14 to the second portion 15.

The second portion 15 is formed with a second inclined surface 17, the second inclined surface 17 being inwardly tapered in a direction from the first portion 14 to the second portion 15.

In the implementation process, when the hydraulic equipment 19 injects liquid into the liquid injection channel 13, high-pressure liquid acts on the first inclined surface 16, and under the guidance of the first inclined surface 16, acting force faces the inside of the active compensation rubber core 12, so that the first part 14 deforms inwards, and the drill rod 1A is tightly held to form sealing; meanwhile, when the downhole liquid returns from the downhole, the downhole liquid can smoothly flow out from the bypass channel 10a under the guidance of the second inclined plane 17; meanwhile, the downhole liquid acts on the second inclined surface 17, and the acting force of the downhole liquid faces the interior of the active compensation rubber core 12, so that the second inclined surface 17 deforms inwards, and the drill rod 1A is held tightly to form a seal.

In one embodiment, the first portion 14 has an isosceles trapezoid cross section, and the second portion 15 is mirror symmetric with the first portion 14.

In the implementation process, the section of the first part 14 is in an isosceles trapezoid shape, which is beneficial to uniform stress of the first part 14, so that the active compensation rubber core 12 is stably held tightly on the drill rod 1A to form good sealing; meanwhile, when the first part 14 and the second part 15 are in mirror symmetry, that is, when the cross section of the first part 14 and the second part 15 is in an upper and lower trapezoidal structure, when the hydraulic pressure applied to the first part 14 by the hydraulic equipment 19 is controlled to be consistent with the hydraulic pressure of the downhole liquid to the second part 15, the stress balance of the active compensation rubber core 12 is facilitated, and the sealing property of the active compensation rubber core 12 and the service life of the active compensation rubber core 12 are ensured; meanwhile, it should be noted that, in order to facilitate the stress balance of the active compensation rubber core 12, the inner cavity of the active compensation rubber core 12 with balanced stress is extended in an equal diameter.

Referring to fig. 1 again, in the present disclosure, a third inclined surface 18 is formed on a side of the upper glue core 11 close to the active compensation glue core 12, and the third inclined surface 18 is retracted along a direction from the upper glue core 11 to the active compensation glue core 12. Wherein, the liquid injection channel 13 is positioned between the gluing core 11 and the active compensation gluing core 12.

In the process of the implementation, when the hydraulic equipment 19 injects liquid into the liquid injection channel 13, part of high-pressure liquid acts on the active compensation rubber core 12, the other part acts on the upper rubber core 11, and under the guide of the third inclined plane 18, acting force faces to the inside of the upper rubber core 11, so that the upper rubber core 11 deforms inwards, and the drill rod 1A is tightly held to form sealing.

It should be noted that, in the present disclosure, the active sealing structure further includes a hydraulic device 19, and the hydraulic device 19 is connected to the liquid injection channel 13. The hydraulic equipment 19 comprises an air supply device 20 and a hydraulic cylinder device 21, wherein the air supply device 20 is connected with the hydraulic cylinder device 21 and drives the hydraulic cylinder device 21 to inject or discharge liquid into or out of the liquid injection channel 13.

In the process of above-mentioned realization, the mode of adoption gas thrust liquid pours into liquid passageway 13 into, does benefit to rubber core 11 and the initiative compensation rubber core 12 and embraces tightly in drilling rod 1A fast, forms sealedly, and hydraulic equipment 19 goes out the liquid simultaneously stably, does benefit to rubber core 11 and the initiative compensation rubber core 12 and forms stable sealedly between the drilling rod 1A, takes place to leak when avoiding liquid in the pit to return to the sealed control head and returns to the rig floor face on.

For clarity of description of the active sealing structure, the active sealing structure shall be referred to as a rotating active sealing control head, or ACD, and a non-rotating active sealing control head, or APCD, respectively, hereinafter:

taking the rotating control head (ACD) as an example, please refer to fig. 3, fig. 4 and fig. 5, fig. 3 is a schematic diagram of the rotating control head (ACD) in the present embodiment, fig. 4 is a schematic diagram of the rotating control head (ACD) in the present embodiment when operating, and fig. 5 is a schematic diagram of the rotating control head (ACD) in the present embodiment when operating.

The rotary control head has the active seal arrangement described above, and the housing assembly 10 includes a rotatable housing 22, a center tube 23, a bearing arrangement 24, and a stationary housing 25.

The rotatable housing 22 is connected to a center tube 23, the center tube 23 is connected to a stationary housing 25 by a bearing device 24, and a bypass passage 10a is formed in the stationary housing 25.

The gluing core 11 is arranged in the rotatable shell 22 and can rotate along with the drill rod 1A.

The active compensation rubber core 12 is positioned in the fixed housing 25 and is connected with the central tube 23.

The filling channel 13 is formed in the central tube 23, the filling channel 13 having two outlets through which hydraulic pressure is applied to the active compensation gel core 12 and the upper gel core 11, respectively.

It should be noted that, in the present disclosure, the liquid injection channel 13 is formed inside the central tube 23 and the bearing device 24 in a cavity-groove structure, and the hydraulic device 19 is connected to the notch of the liquid injection channel 13 in the bearing device 24 and is transported to the glue filling core 11 and the active compensation glue filling core 12 through the liquid injection channel 13 in the central tube 23.

The liquid injection channel 13 in the central tube 23 is provided with a plurality of inlets, the plurality of inlets are formed on the peripheral surface of the central tube 23, the inlets are in butt joint with the liquid injection channel 13 in the central tube 23, and when the central tube 23 rotates for one circle, all the inlets of the liquid injection channel 13 on the central tube 23 can be sequentially communicated with the liquid injection channel 13 of the bearing device 24, so that when the central tube 23 rotates along with the drill rod 1A, high-pressure liquid can be stably conveyed; or, the central tube 23 has a plurality of cavity structures therein, so as to form a plurality of liquid injection channels 13, and each time the central tube 23 rotates for one circle, all the liquid injection channels 13 in the central tube 23 can be sequentially communicated with the liquid injection channels 13 of the bearing device 24, so as to ensure stable delivery of the high-pressure liquid.

In the implementation process, the drill rod 1A passes through the rotatable shell 22, the central tube 23, the bearing device 24 and the fixed shell 25, the rotatable shell 22, the central tube 23, the upper rubber core 11 and the active compensation rubber core 12 can rotate along with the drill rod 1A (the drill rod sometimes rotates and sometimes does not rotate in the drilling operation, which is determined according to specific working conditions), while the drill rod 1A rotates, the hydraulic device 19 (the air source device 20 and the hydraulic cylinder device 21 work) injects liquid into the liquid injection channel 13, the upper rubber core 11 and the active compensation rubber core 12 deform under hydraulic pressure and are folded inwards, so that the upper rubber core and the active compensation rubber core 12 are tightly held in the drill rod 1A to form sealing, when the drill rod 1A rotates, the hydraulic device 19 continuously supplies pressure, and the upper rubber core 11 and the active compensation rubber core 12 are guaranteed to provide stable sealing for the drill.

Taking the non-rotating control head (APCD) as an example, refer to fig. 6, 7 and 8, fig. 6 is a schematic diagram of the non-rotating control head (APCD) in the present embodiment, fig. 7 is a schematic diagram of the non-rotating control head (APCD) in the present embodiment when operating, and fig. 8 is an operating schematic diagram of the non-rotating control head (APCD) in the present embodiment.

The non-rotating control head has the active sealing structure described above, the upper rubber core 11 and the active compensation rubber core 12 are fixed in the housing assembly 10, a first sealing cavity 26 is formed between the upper rubber core 11 and the active compensation rubber core 12, and the liquid injection channel 13 is communicated with the first sealing cavity 26.

The drill rod 1A penetrates through the shell assembly 10, the gluing core 11 and the active compensation glue core 12, and the shell assembly 10, the gluing core 11 and the active compensation glue core 12 are kept fixed and do not rotate along with the drill rod 1A; the hydraulic equipment 19 annotates liquid to the notes liquid passageway 13, and high-pressure liquid gets into first seal chamber 26, acts on rubberizing core 11 and initiative compensation rubber core 12 simultaneously, and rubberizing core 11 and initiative compensation rubber core 12 receive hydraulic pressure and warp, draw in to inside to hold tightly in drilling rod 1A formation seal, when drilling rod 1A is rotatory, hydraulic equipment 19 supplies the pressure continuously, guarantees that the core 11 of rubberizing, initiative compensation rubber core 12 provide stable sealed for drilling rod 1A.

In the present disclosure, the non-rotating control head includes at least two active compensation rubber cores 12, and the at least two active compensation rubber cores 12 are disposed at intervals along the axial direction of the housing assembly 10 and located between the bypass channel 10a and the upper rubber core 11.

A second sealed cavity 27 is formed between two adjacent active compensation rubber cores 12, and each second sealed cavity 27 is provided with a liquid injection channel 13.

As shown in fig. 6 and 7, the non-rotating control head includes two active compensating wicks 12, forming a second sealed chamber 27.

In the implementation process, the non-rotating control head is provided with a plurality of active compensation rubber cores 12, so that the sealing performance of the non-rotating control head is improved; two adjacent active compensation rubber cores 12 are injected with liquid through the same liquid injection channel 13, so that the two active compensation rubber cores are stressed uniformly, and the active compensation rubber cores 12 can be stably held tightly on the drill rod 1A; meanwhile, when the active compensation rubber cores 12 are in an up-down trapezoidal structure, two adjacent active compensation rubber cores 12 are under the action of hydraulic pressure in the same second sealing cavity 27, so that the two active compensation rubber cores 12 are held tightly to the drill rod 1A at the same time to form stable sealing.

In the present disclosure, the first and second sealed chambers 26 and 27 are provided with pressure sensors 28.

In the process of the implementation, the pressure sensors 28 are arranged in the first sealed cavity 26 and the second sealed cavity 27, so that the internal pressure can be obtained in time, and the pressure values acting on the sizing rubber core 11 and the active compensation rubber core 12 can be adjusted.

It should be noted that a pressure sensor 28 may be disposed at the bypass passage 10a for sensing the pressure in the bypass passage 10 a.

It should be noted that, in fig. 6 and 7, the pressure value in the second sealed cavity 27 can be balanced with the pressure value in the bypass channel 10a to ensure the tightness of the active compensation rubber core 12.

In the present disclosure, a lubricant is provided between the upper rubber core 11 and the active compensation rubber core 12 and the drill rod 1A.

In the implementation process, the lubricant can be added into the liquid injected into the liquid injection channel 13, so that the lubricant acts between the gluing core 11 and the drill rod 1A and acts between the active compensation glue core 12 and the drill rod 1A, the friction force between the drill rod 1A and the drill rod 1A is reduced, the drill rod 1A can smoothly rotate, the abrasion of the drill rod 1A caused by long-time friction between the drill rod 1A and the gluing core 11 and the active compensation glue core 12 is reduced, and the service life of the glue core is prolonged.

Please refer to fig. 9 for supplementary explanation, and fig. 9 is a schematic diagram of another non-rotating control head (APCD) in the present embodiment.

The difference from the non-rotating control head of fig. 6 is that in fig. 9, the non-rotating control head includes only one active compensating glue core 12.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (10)

1. An active sealing structure applied to a sealing control head is characterized by comprising:

a housing assembly formed with a bypass channel;

gluing a core;

the active compensation rubber core and the upper rubber core are arranged in the shell assembly at intervals along the axial direction of the shell assembly and used for sealing a drill rod penetrating through the shell assembly, and the active compensation rubber core is closer to the bypass channel than the upper rubber core; and

and the liquid injection channel is formed in the shell assembly, is configured to be connected with hydraulic equipment, and applies hydraulic pressure to the gluing core and the active compensation gluing core, so that the gluing core and the active compensation gluing core are tightly held on the drill rod to form sealing.

2. The active sealing structure of claim 1,

the active compensation rubber core comprises a first part and a second part which are connected with each other, and the second part is closer to the bypass channel than the first part;

the first part is provided with a first inclined surface which is outward expanded along the direction from the first part to the second part;

the second part is provided with a second inclined surface which is in a retraction shape along the direction from the first part to the second part.

3. The active sealing structure of claim 2,

the cross section of the first part is in an isosceles trapezoid shape, and the second part and the first part are in mirror symmetry.

4. The active sealing structure of claim 1,

a third inclined plane is formed on one side, close to the active compensation rubber core, of the upper rubber core, and the third inclined plane is in a retracted shape along the direction from the upper rubber core to the active compensation rubber core;

the liquid injection channel is positioned between the gluing core and the active compensation gluing core.

5. Active sealing structure according to any of claims 1 to 4,

the active sealing structure further comprises hydraulic equipment, and the hydraulic equipment is connected with the liquid injection channel;

the hydraulic equipment comprises an air source device and a hydraulic cylinder device, wherein the air source device is connected with the hydraulic cylinder device and drives the hydraulic cylinder device to inject or discharge liquid into or out of the liquid injection channel.

6. A rotary control head is characterized in that,

the rotating control head having an active sealing structure of any one of claims 1-5;

the housing assembly comprises a rotatable housing, a center tube, a bearing device and a fixed housing;

the rotatable shell is connected with the central pipe, the central pipe is connected with the fixed shell through a bearing device, and the bypass channel is formed in the fixed shell;

the gluing core is arranged in the rotatable shell and can rotate along with the drill rod;

the active compensation rubber core is positioned in the fixed shell and is connected with the central pipe;

the liquid injection channel is formed in the central pipe and is provided with two outlets, and the outlets respectively apply hydraulic pressure to the active compensation rubber core and the upper rubber core.

7. A non-rotating control head is characterized in that,

the non-rotating control head having an active sealing structure of any of claims 1-5;

the upper rubber core and the active compensation rubber core are fixed in the shell assembly, a first sealing cavity is formed between the upper rubber core and the active compensation rubber core, and the liquid injection channel is communicated with the first sealing cavity.

8. The non-rotating control head of claim 7,

the non-rotating control head comprises at least two active compensation rubber cores which are arranged at intervals along the axial direction of the shell assembly and are positioned between the bypass channel and the upper rubber core;

two adjacent second seal chambers are formed between the active compensation rubber cores, and each second seal chamber is provided with the liquid injection channel.

9. The non-rotating control head of claim 8,

and the first sealed cavity and the second sealed cavity are provided with pressure sensors.

10. The non-rotating control head of claim 7,

and a lubricant is arranged between the gluing core and the drill rod and between the active compensation glue core and the drill rod.

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