CN115012887B

CN115012887B - Water-doped wellhead with environment-friendly sealing mechanism

Info

Publication number: CN115012887B
Application number: CN202210716873.7A
Authority: CN
Inventors: 邓家祥; 王辉
Original assignee: Daqing Danfeng Petroleum Technology Development Co ltd
Current assignee: Daqing Danfeng Petroleum Technology Development Co ltd
Priority date: 2022-06-23
Filing date: 2022-06-23
Publication date: 2023-04-25
Anticipated expiration: 2042-06-23
Also published as: CN115012887A

Abstract

The invention discloses a water-mixing wellhead with an environment-friendly sealing mechanism, which comprises a connecting pipe, wherein bolt connectors are fixedly arranged in the connecting pipe, the number of the bolt connectors is a plurality, sealing assemblies are detachably arranged in the bolt connectors, an upper heat preservation device is detachably arranged on the side edge of the connecting pipe, a lower heat preservation device is detachably arranged at the other end of the connecting pipe, a switch valve is fixedly arranged in the connecting pipe, the water-mixing wellhead with the environment-friendly sealing mechanism is provided, so that the sealing effect is more ideal, the exploitation speed and the recovery ratio of an oil field are improved, the upper heat preservation cover is fixedly connected with the lower heat preservation cover through fastening bolts, the use is convenient, the installation is convenient, the time and the labor are saved, the upper heat preservation device and the lower heat preservation device are firmly installed for preserving the surface of the connecting pipe, the heat preservation effect is more ideal, the water-mixing well is protected, the service life of the water-mixing well is prolonged, and the engineering delay is avoided.

Description

Water-doped wellhead with environment-friendly sealing mechanism

Technical Field

The invention relates to the technical field of downhole tools in oil fields, in particular to a water-doped wellhead with an environment-friendly sealing mechanism.

Background

The oil field water mixing is an important work in the development of oil field heavy oil, the crude oil viscosity of the oil well is large, the temperature is low, the water content is low, the production is difficult, in order to reduce the viscosity of the heavy oil produced liquid, the water mixing technology is needed to be implemented on the oil well, so that the better exploitation and the gathering of crude oil are facilitated, in the exploitation process of the oil well, the water mixing well is used for mixing water, the water mixing well is also called a water injection well, is used for injecting water into an oil layer, in the development process of the oil field, the water is injected into the oil reservoir through a special water injection well, the pressure of the oil layer is maintained or recovered, and the oil reservoir has stronger driving force, so that the exploitation speed and the recovery ratio of the oil reservoir are improved.

The existing water mixing well is usually connected with the valve through a flange in the using process, but the water mixing well is directly placed outdoors and is subjected to environmental change, the sealing performance is not ideal, the internal pressure is reduced in the later period of exploitation, the oil reservoir exploitation speed and the exploitation rate are reduced, meanwhile, the existing device is exposed outdoors, particularly in the northern cold winter, water of a water distribution system is easy to enter the water mixing well, the inside of the water mixing well is frozen, engineering cannot be started due to freezing, engineering delay is caused, meanwhile, the damage of the water mixing well is easy to be caused due to freezing of the water, the service life of the water mixing well is reduced, heat preservation is carried out by winding a hemp rope at present, time and labor are wasted, and meanwhile, the heat preservation effect is not ideal.

Accordingly, the inventor has the advantages of taking hold of the experience of the abundant design development and actual production in the related industry for many years, researching and improving the existing structure and the defect, and providing the water-doped wellhead with the environment-friendly sealing mechanism so as to achieve the purposes of more ideal sealing effect, improving the exploitation speed and recovery ratio of the oil field, being convenient to use, convenient to install, saving time and manpower, more firm in installation, more ideal in heat preservation effect, protecting the water-doped well, prolonging the service life of the water-doped well and avoiding engineering delay.

Disclosure of Invention

In order to overcome the defects of the prior art, the embodiment of the invention provides the water-doped wellhead with the environment-friendly sealing mechanism, which has more ideal sealing effect, improves the exploitation speed and recovery ratio of an oil field, is convenient to use, convenient to install, saves time and labor, has more firm installation and more ideal heat preservation effect, protects the water-doped well, prolongs the service life of the water-doped well, and simultaneously avoids engineering delay so as to solve the problems in the background art.

In order to achieve the above purpose, the present invention provides the following technical solutions: the water-doped wellhead is characterized by comprising a connecting pipe, wherein bolt connectors are fixedly arranged in the connecting pipe, sealing assemblies are detachably arranged in the bolt connectors, an upper heat preservation device is detachably arranged on the side edge of the connecting pipe, a lower heat preservation device is detachably arranged at the other end of the connecting pipe, a switch valve is fixedly arranged in the connecting pipe, and a valve heat preservation device is movably sleeved on the outer surface of the switch valve; the bolt connector comprises a bolt fixing block, a placing groove is formed in the side edge of the bolt fixing block, and an embedding groove is formed in the placing groove; the sealing assembly comprises a protection ring, a connecting rod is fixedly arranged in the protection ring, a rubber sealing sleeve is fixedly arranged in the connecting rod, a sealing gasket is fixedly arranged at the tail end of the connecting rod, the rubber sealing sleeve is fixedly arranged at two ends of the sealing gasket, supporting columns are fixedly arranged on two sides of the sealing gasket, flat-top pyramid blocks are fixedly arranged at the tail ends of the supporting columns, a fixing ring is fixedly arranged at the tail ends of the flat-top pyramid blocks, the fixing ring is movably arranged in the rubber sealing sleeve, the rubber sealing sleeve is movably arranged in the scarf joint groove, the protection ring is movably sleeved on the outer surface of the placing groove, the number of the flat-top pyramid blocks is a plurality of the flat-top pyramid blocks, the flat-top pyramid blocks are uniformly distributed on two sides of the sealing gasket, and the connecting rod is movably arranged in the placing groove.

In a preferred embodiment, the rubber sealing sleeve comprises a rubber sleeve, arc-shaped blocks are fixedly arranged at two ends of the inner portion of the rubber sleeve, a supporting frame is fixedly arranged on the side edge of each arc-shaped block, a sliding block is movably arranged in the supporting frame, a movable spring is fixedly arranged at the bottom of each sliding block, the other end of each movable spring is fixedly arranged on the side edge of each arc-shaped block, a ball is movably arranged at one end of each sliding block, the ball is movably arranged on the side edge of each flat-top pyramid block, and the rubber sealing sleeve is made of flexible rubber.

In a preferred embodiment, the upper heat preservation device comprises an upper heat preservation cover, a water inlet is fixedly arranged at the top of the upper heat preservation cover, an upper connecting block is fixedly arranged at two ends of the upper heat preservation cover, fastening bolts are detachably arranged at the other two ends of the upper heat preservation cover, and water outlets are fixedly arranged at two ends of the bottom of the upper heat preservation cover.

In a preferred embodiment, the lower heat preservation device comprises a lower heat preservation cover, two ends of the lower heat preservation cover are fixedly provided with lower connecting blocks, two ends of the top of the lower heat preservation cover are provided with water inlets corresponding to the water outlets, the top of each water inlet is adhered with a sealing ring, and the bottom of the lower heat preservation cover is provided with a water outlet.

In a preferred embodiment, the material of upper heat preservation lid is the heat preservation material, upper heat preservation lid includes the top coating, the inside fixed mounting of top coating has an upper steel pipe layer, the side fixed mounting of upper steel pipe layer has an upper water tank, the top and the water inlet fixed intercommunication of upper water tank, the side fixed mounting of upper water tank has an upper glass cotton heat preservation, upper water tank and outlet fixed intercommunication.

In a preferred embodiment, the material of lower heat preservation lid is the heat preservation material, lower heat preservation lid includes the undercoating, the inside fixed mounting of undercoating has lower steel pipe layer, the side fixed mounting of lower steel pipe layer has the lower water tank, the bottom and the delivery port fixed intercommunication of lower water tank, the side fixed mounting of lower water tank has the cotton heat preservation of glass down, the lower water tank is fixed intercommunication with the water inlet nozzle.

In a preferred embodiment, the upper heat-insulating cover is detachably mounted on the top of the lower heat-insulating cover through a fastening bolt, the water outlet is movably mounted in the sealing ring, and the upper connecting block and the lower connecting block are fixedly mounted on the side edges of the placing groove through screws.

In a preferred embodiment, the valve heat preservation device is made of the same material and connected with the upper heat preservation device and the lower heat preservation device, and a movable hole corresponding to the switch valve is formed in the valve heat preservation device.

The invention has the technical effects and advantages that:

1. according to the invention, when the plurality of connecting pipes are connected through the bolts, the sealing assembly is placed between the two bolt connectors, the rubber sealing sleeve is positioned in the embedding groove, when the bolt connectors are connected with the other bolt connector through the bolts, the flat-top pyramid block can move towards the inside of the embedding groove when the two bolt connectors are close to each other, the balls move on the two side edges of the flat-top pyramid block, the balls push the arc-shaped blocks to enable the rubber sleeve to be unfolded, so that the rubber sleeve is tightly attached in the embedding groove, the fixing ring is pressed at the bottom of the embedding groove, and the sealing gasket is sealed, so that the sealing effect is more ideal, and the exploitation speed and the recovery ratio of an oil field are improved.

2. According to the invention, the upper connecting block and the lower connecting block are fixedly arranged on the side edges of the bolt connectors through the bolts, and meanwhile, the upper heat-insulating cover is fixedly connected with the lower heat-insulating cover through the fastening bolts, so that the device is convenient to use, convenient to install, time-saving and labor-saving, and firm in installation.

3. According to the invention, the upper heat preservation device and the lower heat preservation device are arranged to preserve heat on the surface of the connecting pipe, so that damage to the water mixing well head caused by severe cold weather is prevented, when ice is generated in the interior, hot water is injected into the interior of the water inlet, enters the interior of the upper water tank, finally flows into the interior of the lower water tank through the water inlet nozzle through the water outlet, so that the outer surface of the connecting pipe is quickly frozen, the water outlet can be opened, cold water is discharged, the heat preservation effect is more ideal, the water mixing well is protected, the service life of the water mixing well is prolonged, and engineering delay is avoided.

Drawings

Fig. 1 is a schematic diagram of the overall structure of the present invention.

Fig. 2 is a schematic view of the structure of the bolt joint and the sealing assembly of the present invention.

FIG. 3 is a schematic view of the internal structure of the seal assembly of the present invention.

Fig. 4 is a schematic view of the rubber sealing sleeve of the present invention.

Fig. 5 is a schematic structural diagram of the upper heat preservation device of the present invention.

Fig. 6 is a schematic view of the structure of the lower heat insulation device of the present invention.

Fig. 7 is a schematic diagram of the material structure of the upper and lower heat insulation devices according to the present invention.

Fig. 8 is a schematic structural view of a valve heat preservation device of the present invention.

The reference numerals are: 1. a connecting pipe; 2. opening and closing a valve; 3. a bolt connector; 4. a seal assembly; 5. a heat preservation device is arranged; 6. a lower heat preservation device; 7. a valve heat preservation device; 31. a bolt fixing block; 32. a placement groove; 33. a scarf joint groove; 41. a protective ring; 42. a connecting rod; 43. a rubber sealing sleeve; 44. a sealing gasket; 45. a support column; 46. flat top pyramid blocks; 47. a fixing ring; 431. a rubber sleeve; 432. an arc-shaped block; 433. a support frame; 434. a movable spring; 435. a sliding block; 436. a ball; 51. an upper heat preservation cover; 52. a water inlet; 53. an upper connecting block; 54. a water outlet; 55. a fastening bolt; 61. a lower heat-preserving cover; 62. a lower connecting block; 63. a water outlet; 64. a seal ring; 65. a water inlet nozzle; 511. coating; 512. a steel pipe layer is arranged on the upper part; 513. a water supply tank; 514. a glass wool heat-insulating layer is arranged on the glass wool; 611. a lower coating layer; 612. a lower steel pipe layer; 613. a lower water tank; 614. a lower glass wool heat-insulating layer; 71. a movable hole.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

The water-doped wellhead with the environment-friendly sealing mechanism as shown in the accompanying drawings 1-8 comprises a connecting pipe 1, wherein bolt connectors 3 are fixedly arranged in the connecting pipe 1, the number of the bolt connectors 3 is a plurality, sealing assemblies 4 are detachably arranged in the plurality of the bolt connectors 3, an upper heat preservation device 5 is detachably arranged on the side edge of the connecting pipe 1, a lower heat preservation device 6 is detachably arranged at the other end of the connecting pipe 1, a switch valve 2 is fixedly arranged in the connecting pipe 1, and a valve heat preservation device 7 is movably sleeved on the outer surface of the switch valve 2; the bolt connector 3 comprises a bolt fixing block 31, a placing groove 32 is formed in the side edge of the bolt fixing block 31, and an embedding groove 33 is formed in the placing groove 32; the seal assembly 4 comprises a protection ring 41, a connecting rod 42 is fixedly arranged in the protection ring 41, a rubber sealing sleeve 43 is fixedly arranged in the connecting rod 42, a sealing gasket 44 is fixedly arranged at the tail end of the connecting rod 42, the rubber sealing sleeve 43 is fixedly arranged at two ends of the sealing gasket 44, supporting columns 45 are fixedly arranged on two side edges of the sealing gasket 44, flat-top pyramid blocks 46 are fixedly arranged at the tail ends of the supporting columns 45, a fixing ring 47 is fixedly arranged at the tail ends of the flat-top pyramid blocks 46, the fixing ring 47 is movably arranged in the rubber sealing sleeve 43, the rubber sealing sleeve 43 is movably arranged in the embedding groove 33, the protection ring 41 is movably sleeved on the outer surface of the placing groove 32, the number of the flat-top pyramid blocks 46 is a plurality, the flat-top pyramid blocks 46 are uniformly distributed on two sides of the sealing gasket 44, and the connecting rod 42 is movably arranged in the placing groove 32.

As shown in fig. 2 to fig. 4, the rubber sealing sleeve 43 comprises a rubber sleeve 431, wherein both ends of the inside of the rubber sleeve 431 are fixedly provided with arc blocks 432, the side edges of the arc blocks 432 are fixedly provided with supporting frames 433, the inside of the supporting frames 433 is movably provided with sliding blocks 435, the bottoms of the sliding blocks 435 are fixedly provided with movable springs 434, the other ends of the movable springs 434 are fixedly provided with the side edges of the arc blocks 432, one end of the sliding blocks 435 is movably provided with balls 436, the balls 436 are movably arranged on the side edges of flat-topped pyramid blocks 46, and the rubber sealing sleeve 43 is made of flexible rubber; the upper heat preservation device 5 comprises an upper heat preservation cover 51, a water inlet 52 is fixedly arranged at the top of the upper heat preservation cover 51, an upper connecting block 53 is fixedly arranged at the two ends of the upper heat preservation cover 51, fastening bolts 55 are detachably arranged at the other two ends of the upper heat preservation cover 51, and water outlets 54 are fixedly arranged at the two ends of the bottom of the upper heat preservation cover 51; the lower heat preservation device 6 comprises a lower heat preservation cover 61, two ends of the lower heat preservation cover 61 are fixedly provided with lower connecting blocks 62, two ends of the top of the lower heat preservation cover 61 are provided with water inlets 65 corresponding to the water outlets 54, the top of the water inlets 65 is adhered with sealing rings 64, and the bottom of the lower heat preservation cover 61 is provided with water outlets 63.

Specifically, rubber seal cover 43 movable mounting is in the inside of scarf joint groove 33, ball 436 movable mounting is at the both ends of flat top pyramid piece 46, in the device course of working, when a plurality of connecting pipes 1 pass through the bolt with bolted connection head 3 connect, place seal assembly 4 between two bolted connection heads 3, rubber seal cover 43 is located in the inside of scarf joint groove 33, when being connected with another bolted connection head 3 through the bolt with bolted connection head 3, flat top pyramid piece 46 can move to the inside of scarf joint groove 33 when two bolted connection heads 3 are close to each other, ball 436 moves at the both sides limit of flat top pyramid piece 46, ball 436 promotes arc piece 432 and makes rubber sleeve 431 expand, make rubber sleeve 431 closely laminate in the inside of scarf joint groove 33, simultaneously solid fixed ring 47 presses in the bottom of scarf joint groove 33, sealing washer 44 self completion seals, make sealed effect more ideal, promote the exploitation speed and the recovery ratio of oil field.

As shown in fig. 5 and 6, the upper heat-insulating cover 51 is detachably mounted on the top of the lower heat-insulating cover 61 by fastening bolts 55, the water outlet 54 is movably mounted in the sealing ring 64, and the upper connection block 53 and the lower connection block 62 are fixedly mounted on the side of the placement groove 32 by screws; the material and the connection mode of the valve heat preservation device 7 are the same as those of the upper heat preservation device 5 and the lower heat preservation device 6, and a movable hole 71 corresponding to the switch valve 2 is formed in the valve heat preservation device 7.

Specifically, outlet 54 movable mounting is in the inside of water inlet 65, and upper heat preservation lid 51 movable mounting is at the top of heat preservation lid 61 down, and upper connecting block 53 movable mounting is at the top of connecting block 62 down, and in the device working process, accessible bolt will go up connecting block 53 and lower connecting block 62 fixed mounting in the side of bolted connection head 3, and upper heat preservation lid 51 passes through fastening bolt 55 and heat preservation lid 61 fixed connection down simultaneously, and convenient to use installs conveniently, save time and manpower, and the installation is more firm simultaneously.

Referring to fig. 7 and 8, the upper heat-insulating cover 51 is made of a heat-insulating material, the upper heat-insulating cover 51 includes an upper coating 511, an upper steel pipe layer 512 is fixedly installed in the upper coating 511, an upper water tank 513 is fixedly installed on the side of the upper steel pipe layer 512, the top of the upper water tank 513 is fixedly communicated with the water inlet 52, an upper glass wool heat-insulating layer 514 is fixedly installed on the side of the upper water tank 513, and the upper water tank 513 is fixedly communicated with the water outlet 54; the lower heat preservation cover 61 is made of heat preservation materials, the lower heat preservation cover 61 comprises a lower coating 611, a lower steel pipe layer 612 is fixedly arranged in the lower coating 611, a lower water tank 613 is fixedly arranged on the side edge of the lower steel pipe layer 612, the bottom of the lower water tank 613 is fixedly communicated with the water outlet 63, a lower glass wool heat preservation layer 614 is fixedly arranged on the side edge of the lower water tank 613, and the lower water tank 613 is fixedly communicated with the water inlet nozzle 65.

Specifically, the material of valve heat preservation device 7, the inner structure is the same with the material of last heat preservation device 5 and lower heat preservation device 6, switch valve 2 movable mounting is in the inside of movable hole 71, outlet 54 movable mounting is in the inside of water inlet 65, in the device course of operation, go up heat preservation device 5 and lower heat preservation device 6 and keep warm for the surface of connecting pipe 1, prevent the harm of severe weather to the watering well head, when the inside produces icing, through the inside injection hot water at water inlet 52, hot water enters into the inside of upper water tank 513, finally flow into the inside of lower water tank 613 through outlet 54 through water inlet 65, make the surface of connecting pipe 1 carry out quick defrosting, finally can open delivery port 63, discharge cold water, heat preservation effect is more ideal simultaneously, the protection watering well, the life of extension watering well, avoid producing engineering delay simultaneously.

The working principle of the invention is as follows: the rubber sealing sleeve 43 is movably arranged in the scarf joint groove 33, the balls 436 are movably arranged at two ends of the flat-top pyramid block 46, when the plurality of connecting pipes 1 are connected with the bolt connectors 3 through bolts in the working process of the device, the sealing assembly 4 is placed between the two bolt connectors 3, the rubber sealing sleeve 43 is positioned in the scarf joint groove 33, when the bolt connectors 3 are connected with the other bolt connector 3 through bolts, the two bolt connectors 3 are close to each other, the flat-top pyramid block 46 moves towards the inside of the scarf joint groove 33, the balls 436 move at two sides of the flat-top pyramid block 46, the balls 436 push the arc-shaped blocks 432 to enable the rubber sleeve 431 to be unfolded, the rubber sleeve 431 is tightly attached to the inside of the scarf joint groove 33, meanwhile, the fixing ring 47 is pressed at the bottom of the scarf joint groove 33, and the sealing gasket 44 is sealed, so that the exploitation speed and the recovery ratio of an oil field are more ideal;

the water outlet 54 is movably arranged in the water inlet mouth 65, the upper heat-insulating cover 51 is movably arranged at the top of the lower heat-insulating cover 61, the upper connecting block 53 is movably arranged at the top of the lower connecting block 62, in the working process of the device, the upper connecting block 53 and the lower connecting block 62 can be fixedly arranged at the side edge of the bolt connector 3 through bolts, meanwhile, the upper heat-insulating cover 51 is fixedly connected with the lower heat-insulating cover 61 through the fastening bolts 55, the use is convenient, the installation is convenient, the time and the labor are saved, and the installation is firmer;

the valve heat preservation device 7 is made of materials, the internal structure is the same as that of the upper heat preservation device 5 and the lower heat preservation device 6, the switch valve 2 is movably mounted in the movable hole 71, the water outlet 54 is movably mounted in the water inlet 65, in the working process of the device, the upper heat preservation device 5 and the lower heat preservation device 6 are used for preserving heat for the surface of the connecting pipe 1, damage to a water doping wellhead in severe cold weather is prevented, when freezing is generated in the interior, hot water is injected into the water inlet 52, enters the upper water tank 513, finally flows into the lower water tank 613 through the water inlet 65 through the water outlet 54, the outer surface of the connecting pipe 1 is quickly frozen, the water outlet 63 can be opened, cold water is discharged, the heat preservation effect is more ideal, a water doping well is protected, the service life of the water doping well is prolonged, and engineering delay is avoided.

The last points to be described are: first, in the description of the present application, it should be noted that, unless otherwise specified and defined, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be mechanical or electrical, or may be a direct connection between two elements, and "upper," "lower," "left," "right," etc. are merely used to indicate relative positional relationships, which may be changed when the absolute position of the object being described is changed;

secondly: in the drawings of the disclosed embodiments, only the structures related to the embodiments of the present disclosure are referred to, and other structures can refer to the common design, so that the same embodiment and different embodiments of the present disclosure can be combined with each other under the condition of no conflict;

finally: the foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.

Claims

1. The utility model provides a watering wellhead with environment-friendly sealing mechanism, includes connecting pipe (1), its characterized in that, the inside fixed mounting of connecting pipe (1) has bolted connection head (3), the quantity of bolted connection head (3) is a plurality of, and a plurality of inside demountable installation of bolted connection head (3) has seal assembly (4), the side demountable installation of connecting pipe (1) has last heat preservation device (5), the other end demountable installation of connecting pipe (1) has lower heat preservation device (6), the inside fixed mounting of connecting pipe (1) has switch valve (2), the surface activity of switch valve (2) has cup jointed valve heat preservation device (7);

the bolt connector (3) comprises a bolt fixing block (31), a placing groove (32) is formed in the side edge of the bolt fixing block (31), and an embedding groove (33) is formed in the placing groove (32);

seal assembly (4) are including guard ring (41), the inside fixed mounting of guard ring (41) has connecting rod (42), the inside fixed mounting of connecting rod (42) has rubber seal cover (43), the tail end fixed mounting of connecting rod (42) has sealing washer (44), rubber seal cover (43) fixed mounting is at the both ends of sealing washer (44), the equal fixed mounting of both sides limit of sealing washer (44) has support column (45), the tail end fixed mounting of support column (45) has flat top pyramid piece (46), the tail end fixed mounting of flat top pyramid piece (46) has solid fixed ring (47), gu fixed ring (47) movable mounting is in the inside of rubber seal cover (43), rubber seal cover (43) movable mounting is in the inside of scarf joint groove (33), the surface at standing groove (32) is cup jointed in the activity of guard ring (41), the quantity of flat top pyramid piece (46) is a plurality of, flat top pyramid piece (46) evenly distributed is in the both sides of sealing washer (44), the inside of connecting rod (42) movable mounting at the standing groove (32).

2. The water-doped wellhead with an environmental protection seal mechanism of claim 1, wherein: the rubber sealing sleeve (43) comprises a rubber sleeve (431), arc blocks (432) are fixedly arranged at two ends of the inside of the rubber sleeve (431), supporting frames (433) are fixedly arranged on the side edges of the arc blocks (432), sliding blocks (435) are movably arranged in the supporting frames (433), movable springs (434) are fixedly arranged at the bottoms of the sliding blocks (435), the other ends of the movable springs (434) are fixedly arranged on the side edges of the arc blocks (432), balls (436) are movably arranged at one ends of the sliding blocks (435), the balls (436) are movably arranged on the side edges of flat-topped pyramid blocks (46), and the rubber sealing sleeve (43) is made of flexible rubber.

3. The water-doped wellhead with an environmental protection seal mechanism of claim 1, wherein: the upper heat preservation device (5) comprises an upper heat preservation cover (51), a water inlet (52) is fixedly arranged at the top of the upper heat preservation cover (51), an upper connecting block (53) is fixedly arranged at the two ends of the upper heat preservation cover (51), fastening bolts (55) are detachably arranged at the other two ends of the upper heat preservation cover (51), and water outlets (54) are fixedly arranged at the two ends of the bottom of the upper heat preservation cover (51).

4. The water-doped wellhead with an environmental protection seal mechanism of claim 1, wherein: the lower heat preservation device (6) comprises a lower heat preservation cover (61), two ends of the lower heat preservation cover (61) are fixedly provided with lower connecting blocks (62), two ends of the top of the lower heat preservation cover (61) are provided with water inlets (65) corresponding to the water outlets (54), the tops of the water inlets (65) are adhered with sealing rings (64), and the bottoms of the lower heat preservation cover (61) are provided with water outlets (63).

5. A water-doped wellhead with an environmental protection seal mechanism as claimed in claim 3 wherein: the material of going up heat preservation lid (51) is the heat preservation material, it includes coating (511) to go up heat preservation lid (51), the inside fixed mounting of coating (511) has upper steel pipe layer (512), the side fixed mounting of upper steel pipe layer (512) has water tank (513), the top and the water inlet (52) fixed intercommunication of water tank (513), the side fixed mounting of water tank (513) has glass wool heat preservation (514), water tank (513) and outlet (54) fixed intercommunication.

6. The water-doped wellhead with an environmental protection seal mechanism as recited in claim 4 wherein: the material of lower heat preservation lid (61) is the heat preservation material, lower heat preservation lid (61) is including coating (611) down, the inside fixed mounting of coating (611) down has lower steel pipe layer (612), the side fixed mounting of lower steel pipe layer (612) has lower water tank (613), the bottom and the delivery port (63) fixed intercommunication of lower water tank (613), the side fixed mounting of lower water tank (613) has glass cotton heat preservation (614) down, lower water tank (613) and water inlet nozzle (65) fixed intercommunication.

7. A water-doped wellhead with an environmental protection seal mechanism as claimed in claim 3 wherein: the upper heat preservation cover (51) is detachably mounted on the top of the lower heat preservation cover (61) through a fastening bolt (55), the water outlet (54) is movably mounted in the sealing ring (64), and the upper connecting block (53) and the lower connecting block (62) are fixedly mounted on the side edge of the placing groove (32) through screws.

8. The water-doped wellhead with an environmental protection seal mechanism of claim 1, wherein: the valve heat preservation device (7) is the same as the upper heat preservation device (5) and the lower heat preservation device (6) in material and connection mode, and a movable hole (71) corresponding to the switch valve (2) is formed in the valve heat preservation device (7).