CN209892149U - Horizontal well wellhead plugging device - Google Patents

Abstract

The utility model provides a horizontal well head plugging device, include: a flange plate; the plugging component is located below the flange plate and is connected with the flange plate, the plugging component comprises a first plugging piece and a second plugging piece, and the first plugging piece and the second plugging piece respectively comprise a split fishing spear structure. The technical scheme of this application has effectively solved the problem of overflow, the kick that appear when double-barrelled horizontal well operation among the prior art.

Description

Horizontal well wellhead plugging device

Technical Field

The utility model relates to an oil field well workover engineering field particularly, relates to a horizontal well head plugging device.

Background

In the well repairing process, the well is influenced by the interference of a steam injection stratum or the abnormal pressure fluctuation of the stratum, the pressure in the well changes constantly, and the well kick or the well blowout out of control accident can happen at any time. The staff observes the well head liquid level at any time and changes, and when pressure is greater than hydrostatic column pressure, in case there is the blowout sign, start emergency measures immediately, install well head device robbed by force, close the well head. In the prior art, a conventional well blowout preventer is a common safe sealing wellhead device for quickly closing a wellhead when a blowout accident occurs, and is mainly used under the condition that the wellhead needs to be closed in the operation processes of oil testing, well repairing, perforation and the like, but the horizontal well cannot be quickly closed by installing the blowout preventer due to the particularity of the wellhead structure of the horizontal well, and can only be quickly installed by emergently installing the wellhead device of the original well, so that the average installation time is as long as 30 minutes.

With the wide application of the horizontal well technology, the horizontal well becomes an important means for efficiently developing the oil field at present. The horizontal well shaft has large oil discharge area, the yield is 2-5 times of that of a straight well, the bottom hole pressure difference is large, and the bottom hole pressure of the horizontal well is determined to be extremely unstable by oil extraction modes such as steam huff and puff, steam flooding, SAGD, double-pipe steam injection and the like. Because the horizontal well has a complex wellhead structure, a special pipe column configuration in the well, a high temperature of the shaft and a large change of the pressure difference at the bottom of the well, and the ground well control facilities and the well control technology still use the well control technology of the vertical well, the double-pipe operation of the horizontal well is more difficult than the well control technology of the common vertical well operation, the well control risk is large, the difficulty in handling underground accidents is large, and the great potential safety hazards such as out-of-control blowout exist in the operation process. The vertical well blowout preventer cannot effectively meet the well control requirement of double-pipe horizontal well operation. Therefore, the development of a special rapid quick-connection simple wellhead device suitable for a horizontal well wellhead is urgently needed to prevent possible runaway accidents such as overflow, well kick and blowout at any time.

SUMMERY OF THE UTILITY MODEL

A primary object of the present invention is to provide a horizontal well wellhead plugging device to solve the problems of overflow and kick during the operation of a double-tube horizontal well in the prior art.

In order to achieve the above object, according to the utility model provides a horizontal well wellhead plugging device, include: a flange plate; the plugging component is located below the flange plate and is connected with the flange plate, the plugging component comprises a first plugging piece and a second plugging piece, and the first plugging piece and the second plugging piece respectively comprise a split fishing spear structure.

Further, the split spear structure comprises a mandrel and a connecting cylinder sleeved outside the mandrel, the connecting cylinder comprises a cylinder body and a plurality of clamping pieces connected with the cylinder body and arranged at intervals, first threads are arranged on the outer side face of each clamping piece, the mandrel comprises a main body part and an expanding part arranged below the main body part, the connecting cylinder and the mandrel synchronously rotate, the connecting cylinder can move relative to the mandrel along the axis, the clamping pieces shrink inwards when the first threads contact with second threads on the inner wall of the oil pipe to be plugged, and the expanding part can abut against the clamping pieces to enable the clamping pieces to expand outwards so as to connect the connecting cylinder with the oil pipe to be plugged.

Further, horizontal well wellhead plugging device still includes first hanger and second hanger, and first hanger and second hanger are all worn to establish in the ring flange, and the first end and the ring flange of first hanger are rotationally connected, and the second end and the first shutoff piece of first hanger are connected, and the first end and the ring flange of second hanger are rotationally connected, and the second end and the second shutoff piece of second hanger are connected.

Furthermore, a first mounting through hole and a second mounting through hole are formed in the flange plate, the first mounting through hole and the second mounting through hole are arranged on the flange plate at intervals, the first hanger is arranged in the first mounting through hole in a penetrating mode, and the second hanger is arranged in the second mounting through hole in a penetrating mode.

Furthermore, the first mounting through hole comprises a first hole section and a second hole section, the cross section area of the second hole section is smaller than that of the first hole section, a first step surface is formed between the first hole section and the second hole section, the first hanger comprises a first hanger main body arranged in the second hole section in a penetrating mode and a first stop head located in the first hole section, the first step surface is matched with the first stop head in a stopping mode, and the first hole section is a first conical hole.

Furthermore, the second mounting through hole comprises a third hole section and a fourth hole section, the cross section area of the fourth hole section is smaller than that of the third hole section, a second step surface is formed between the third hole section and the fourth hole section, the second hanger comprises a second hanger main body arranged in the fourth hole section in a penetrating mode and a second stop head located in the third hole section, the second step surface is matched with the second stop head in a stopping mode, and the third hole section is a second taper hole.

Furthermore, the horizontal well mouth plugging device further comprises a sealing plug, and the sealing plug is plugged in the third hole section.

Further, horizontal well wellhead plugging device still includes: a first end of the first connector is connected in the first hole section; the plug valve is positioned above the flange plate, and the first end of the plug valve is connected with the second end of the first connector; and the oil pipe assembly comprises an oil pipe short section, and the oil pipe short section is connected with the second end of the plug valve.

Further, the horizontal well mouth plugging device further comprises a second joint and a third joint, the second joint is connected between the first hanger and the first plugging piece, and the third joint is connected between the second hanger and the second plugging piece.

Furthermore, the flange plate also comprises a plurality of connecting holes which are arranged at intervals along the circumferential direction of the flange plate.

Use the technical scheme of the utility model, be provided with ring flange and shutoff subassembly. The shutoff subassembly is located the below of ring flange and is connected with the ring flange, and the shutoff subassembly includes first shutoff piece and second shutoff piece, and first shutoff piece and second shutoff piece all include the branch and drag for the lance structure. In this application, the staff is in double-barrelled horizontal well borehole operation, when the condition such as overflow, kick appear in the discovery double-barrelled horizontal well, uses the split to drag for lance structure and oil pipe mouth of pipe to cooperate, can realize plugging up the oil pipe mouth of pipe fast. Furthermore, the flange plate is matched with the plugging assembly to realize rapid closing of the well mouth, overflow and well kick accidents are prevented, operation risks can be reduced, and the environment-friendly effect can be achieved.

Drawings

The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

figure 1 shows a schematic cross-sectional view of an embodiment of a horizontal well wellhead plugging device according to the present invention;

fig. 2 shows an enlarged schematic view at a of the horizontal well wellhead plugging device of fig. 1; and

fig. 3 shows a schematic top view of the horizontal well head plugging device of fig. 1.

Wherein the figures include the following reference numerals:

10. a flange plate; 11. a first mounting through hole; 111. a first bore section; 112. a second bore section; 113. a first step surface; 12. a second mounting through hole; 121. a third bore section; 122. a fourth bore section; 123. a second step surface; 13. connecting holes; 21. a first blocking member; 22. a second blocking member; 23. a mandrel; 231. a main body portion; 232. an expanding portion; 24. a connecting cylinder; 241. a card; 242. a first thread; 243. a barrel; 31. a first hanger; 311. a first stopper; 312. a first hanger body; 32. a second hanger; 321. a second stopper; 322. a second hanger body; 40. a plug valve; 50. an oil pipe nipple; 60. a first joint; 70. sealing the plug; 80. a second joint; 90. and a third joint.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

Unless specifically stated otherwise, the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. 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, further discussion thereof is not required in subsequent figures.

As shown in fig. 1 and fig. 2, the horizontal well mouth plugging device of the present embodiment includes: a flange 10 and a plugging component. The shutoff subassembly is located the below of ring flange 10 and is connected with ring flange 10, and the shutoff subassembly includes first shutoff piece 21 and second shutoff piece 22, and first shutoff piece 21 and second shutoff piece 22 all include the split lance structure of salvaging.

By applying the technical scheme of the embodiment, the flange plate 10 and the plugging component are arranged. The shutoff subassembly is located the below of ring flange 10 and is connected with ring flange 10, and the shutoff subassembly includes first shutoff piece 21 and second shutoff piece 22, and first shutoff piece 21 and second shutoff piece 22 all include the split lance structure of salvaging. In this embodiment, the staff is in double-barrelled horizontal well borehole operation, when the condition such as overflow, kick appear in the discovery double-barrelled horizontal well, uses the split to drag for lance structure and oil pipe mouth of pipe to cooperate, can realize plugging up the oil pipe mouth of pipe fast. Furthermore, the flange plate 10 is matched with the plugging assembly to quickly close the well mouth, overflow and well kick accidents are prevented, operation risks can be reduced, and the environment-friendly effect can be achieved.

As shown in fig. 1 and 2, the split spear structure includes a mandrel 23 and a connecting cylinder 24 sleeved outside the mandrel 23, the connecting cylinder 24 includes a cylinder 243 and a plurality of clamping pieces 241 connected with the cylinder 243 and arranged at intervals, a first thread 242 is arranged on an outer side surface of each clamping piece 241, the mandrel 23 includes a main body 231 and an expanding portion 232 arranged below the main body 231, the connecting cylinder 24 and the mandrel 23 rotate synchronously, the connecting cylinder 24 can move along an axis relative to the mandrel 23, when the first thread 242 contacts with a second thread on an inner wall of an oil pipe to be plugged, the clamping pieces 241 contract inwards, and the expanding portion 232 can abut against the clamping pieces 241 to expand the clamping pieces 241 to connect the connecting cylinder 24 with the oil pipe. The connecting cylinder 24 is sleeved outside the mandrel 23, a sliding groove can be formed in the mandrel 23, and a screw penetrates through the connecting cylinder 24, so that the end of the screw moves in the sliding groove, and the connecting cylinder 24 can move relative to the mandrel 23 along the axis of the connecting cylinder and synchronously rotate with the mandrel 23.

Specifically, when the well mouth needs to be closed urgently and the dangerous situations such as well kick and the like occur in the double-pipe horizontal well, the split fishing spear structure is lifted by the well repairing rack to enter the well mouth downwards. Since the first and second threads are tapered threads, the first thread on the outer side surface of each card 241 is in contact with the second thread on the inner wall of the tubing, the connector barrel 24 can move along its axis to fit with the body 231, and there is a gap between each card 241 and the body 231, so that each card 241 contracts and deforms inwardly. Continue to transfer split fishing spear structure, when first screw thread and second screw thread reach certain cooperation length, well workover shelf promotes split fishing spear structure rebound, card 241 of connecting cylinder 24 and treat through first screw thread and second screw thread fit between the oil pipe of shutoff this moment, consequently connecting cylinder 24 is motionless temporarily, dabber 23 can rebound, make the diameter be greater than the hole enlargement portion 232 and the cooperation of card 241 of the diameter of main part 231, make each card 241 outwards expand the deformation, can keep the butt all the time between each card 241 and the hole enlargement portion 232. When the split spear structure is continuously lifted upwards, the connecting cylinder 24 can lift the oil pipe to be plugged together. Thus, the connector barrel 24 enters the tubing such that the first thread makes a tight thread-to-thread connection with the second thread. The split spear structure is lifted up and the oil pipe confirms whether the two are tightly connected or not. After confirmation, the split spear structure and the oil pipe need to be lowered. The wellhead device comprises a four-way structure, and the flange plate 10 is connected with the four-way structure, so that the wellhead can be quickly closed. After the dangerous case of double-barrelled horizontal well is got rid of, the connection between ring flange 10 and the cross structure is dismantled, and the workover shelf continues to go up and carries the split spear structure, and outside putting oil pipe out the well head, because connecting cylinder 24 and dabber 23 can rotate in step, the threaded connection between each card 241 and the oil pipe can be dismantled to the application extracting tool.

Therefore, in this embodiment, the ring flange 10 and the split spear structure can block off the pipe orifice of an oil pipe, effectively avoid blowout accidents occurring in the underground workover process of the double-pipe horizontal well, ensure the construction safety and avoid safety accidents. In addition, the horizontal well wellhead plugging device is convenient to operate, the working efficiency can be improved, the operation risk is reduced, and the oil field production benefit is improved.

As shown in fig. 1 and 2, the horizontal well mouth plugging device further includes a first hanger 31 and a second hanger 32, the first hanger 31 and the second hanger 32 are both inserted into the flange 10, a first end of the first hanger 31 is rotatably connected with the flange 10, a second end of the first hanger 31 is connected with the first plugging member 21, a first end of the second hanger 32 is rotatably connected with the flange 10, and a second end of the second hanger 32 is connected with the second plugging member 22. In this embodiment, under the condition that the flange plate 10 does not rotate, the first blocking piece 21 and the second blocking piece 22 are respectively matched with the respective pipe orifice of the oil pipe, so that the first blocking piece 21 and the second blocking piece 22 can be rapidly inserted into the respective pipe orifice of the oil pipe, and the matching efficiency between the first blocking piece 21 and the oil pipe thereof and between the second blocking piece 22 and the oil pipe thereof is improved. The first and second block pieces 21, 22 are able to rotate so that their removal from the tubing is facilitated.

As shown in fig. 1 and 2, the flange 10 is provided with a first mounting through hole 11 and a second mounting through hole 12, the first mounting through hole 11 and the second mounting through hole 12 are arranged on the flange 10 at intervals, the first hanger 31 is arranged in the first mounting through hole 11, and the second hanger 32 is arranged in the second mounting through hole 12. Thus, the installation is convenient, the structure is simple, compact and reasonable.

As shown in fig. 1 and 2, the first mounting through hole 11 includes a first hole section 111 and a second hole section 112 having a cross-sectional area smaller than that of the first hole section 111, a first step surface 113 is formed between the first hole section 111 and the second hole section 112, the first hanger 31 includes a first hanger main body 312 inserted into the second hole section 112 and a first stopper 311 located in the first hole section 111, the first step surface 113 is in stopper fit with the first stopper 311, and the first hole section 111 is a first tapered hole. In this embodiment, the first step surface 113 and the first stopper 311 are in stop engagement to prevent the first stopper 311 from moving axially away from the first bore section 111. Thus, the first mounting through hole 11 facilitates the mounting of the first hanger 31.

As shown in fig. 1 and 2, the second mounting through hole 12 includes a third hole segment 121 and a fourth hole segment 122 having a cross-sectional area smaller than that of the third hole segment 121, a second step surface 123 is formed between the third hole segment 121 and the fourth hole segment 122, the second hanger 32 includes a second hanger main body 322 penetrating the fourth hole segment 122 and a second stopper 321 located in the third hole segment 121, the second step surface 123 cooperates with the second stopper 321 in a stopping manner, and the third hole segment 121 is a second tapered hole. In this embodiment, the second step surface 123 and the second stopper 321 stop cooperate to prevent the second stopper 321 from moving axially away from the third bore section 121. In this way, the second mounting through hole 12 facilitates the mounting of the second hanger 32.

As shown in fig. 1 and 2, the horizontal well mouth plugging device further includes a sealing plug 70, and the sealing plug 70 is plugged in the third hole section 121. The sealing plug 70 serves to seal the second mounting hole 12 and to enable connection with the second hanger 32 in the flange 10.

As shown in fig. 1 and 2, the horizontal well mouth plugging device further comprises: a plug valve 40, a tubing assembly and a first sub 60. The first end of the first adapter 60 is attached within the first bore section 111. The first coupling 60 is a reducing coupling. The second end of the first adapter 60 has an outer diameter of about 76mm and the first end of the first adapter 60 has an outer diameter of about 50 mm. The plug valve 40 is positioned above the flange 10, and a first end of the plug valve 40 is connected to a second end of the first connector 60. The plug valve 40 is normally open when not in operation and is closed when a kick occurs in the formation fluid downhole in the horizontal well, preventing fluid from overflowing the first block 21 from flowing up the tubing. The tubing assembly includes a tubing nipple 50, the tubing nipple 50 being connected to the second end of the plug valve 40. The outer diameter of the oil pipe nipple 50 is about 76mm, and one section or two sections of the oil pipe nipple 50 are selected according to actual operation requirements. In this embodiment, tubing coupling is used to connect tubing nipple 50 to plug valve 40. In the present embodiment, a channel is provided in the mandrel 23, and the channel is also called a water hole. In addition, during overflow and well kick during double-pipe horizontal well operation, the workover rack controls the horizontal well mouth plugging device by lifting or lowering the oil pipe nipple 50. In other implementations not shown in the figures, the connections between the sections of tubing subs may be made using tubing couplings.

As shown in fig. 1 and 2, the horizontal well head plugging device further comprises a second joint 80 and a third joint 90, wherein the second joint 80 is connected between the first hanger 31 and the first plugging member 21, and the third joint 90 is connected between the second hanger 32 and the second plugging member 22. In this embodiment, the second joint 80 and the third joint 90 are reducer joints, which facilitates connection.

As shown in fig. 1 and 3, the flange 10 further includes a plurality of connection holes 13 provided at intervals in a circumferential direction thereof. In this embodiment, the flange plate 10 is a twelve-hole steel high-pressure flange, the wellhead device comprises a four-way structure, and the flange plate 10 is connected with the four-way structure, so that the effects of bearing underground pressure and sealing a wellhead are achieved. Thus, the flange 10 is easy to manufacture and reliable.

In this embodiment, because horizontal well wellhead plugging device simple structure, whole light in weight. And the connection mode between each structure is simple, and a single person can quickly connect and install the horizontal well mouth plugging device, thereby realizing the purpose of quickly closing the well mouth. Furthermore, the device is processed by the relevant mechanism. The average well mouth closing time of the horizontal well mouth plugging device is greatly shortened relative to the installation of an original well mouth device, and the actual application effect of the device is obvious. Therefore, in the process of downhole operation of the double-pipe horizontal well, when the downhole abnormal pressure is met, overflow or well kick or even blowout accidents are easy to happen. Through the horizontal well wellhead plugging device in this embodiment, not only improved the efficiency of emergent processing blowout accident, reduced polluted environment's risk moreover, effectively promoted well head control technology safety control level.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the orientation words such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, and in the case of not making a contrary explanation, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be interpreted as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and if not stated otherwise, the terms have no special meaning, and therefore, the scope of the present invention should not be construed as being limited.

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

Claims (10)

1. A horizontal well wellhead plugging device is characterized by comprising:

a flange (10);

the shutoff subassembly, the shutoff subassembly is located the below of ring flange (10) and with ring flange (10) are connected, the shutoff subassembly includes first shutoff piece (21) and second shutoff piece (22), first shutoff piece (21) with second shutoff piece (22) all include split fishing spear structure.

2. The horizontal wellhead plugging device according to claim 1, wherein the split spear structure comprises a mandrel (23) and a connecting cylinder (24) sleeved outside the mandrel (23), the connecting cylinder (24) comprises a cylinder body (243) and a plurality of clamping pieces (241) connected with the cylinder body (243) and arranged at intervals, a first thread (242) is arranged on the outer side surface of each clamping piece (241), the mandrel (23) comprises a main body part (231) and an expanding part (232) arranged below the main body part (231), the connecting cylinder (24) and the mandrel (23) rotate synchronously, the connecting cylinder (24) can move relative to the mandrel (23) along the axis thereof, the clamping pieces (241) contract inwards when the first thread (242) is contacted with a second thread on the inner wall of an oil pipe to be plugged, and the expanding part (232) can abut against the clamping pieces (241) to expand the clamping pieces (241) outwards to connect the clamping pieces (241) The barrel (24) is connected with the oil pipe to be plugged.

3. The horizontal wellhead plugging device according to claim 1, further comprising a first hanger (31) and a second hanger (32), wherein the first hanger (31) and the second hanger (32) are both arranged in the flange (10) in a penetrating manner, a first end of the first hanger (31) is rotatably connected with the flange (10), a second end of the first hanger (31) is connected with the first plugging member (21), a first end of the second hanger (32) is rotatably connected with the flange (10), and a second end of the second hanger (32) is connected with the second plugging member (22).

4. The plugging device for the wellhead of the horizontal well according to claim 3 is characterized in that a first installation through hole (11) and a second installation through hole (12) are formed in the flange plate (10), the first installation through hole (11) and the second installation through hole (12) are arranged on the flange plate (10) at intervals, the first hanger (31) is arranged in the first installation through hole (11) in a penetrating mode, and the second hanger (32) is arranged in the second installation through hole (12) in a penetrating mode.

5. The horizontal well wellhead plugging device according to claim 4, wherein the first installation through hole (11) comprises a first hole section (111) and a second hole section (112) with a cross-sectional area smaller than that of the first hole section (111), a first step surface (113) is formed between the first hole section (111) and the second hole section (112), the first hanger (31) comprises a first hanger main body (312) penetrating into the second hole section (112) and a first stop head (311) located in the first hole section (111), the first step surface (113) is in stop fit with the first stop head (311), and the first hole section (111) is a first conical hole.

6. The horizontal well wellhead plugging device according to claim 4, wherein the second installation through hole (12) comprises a third hole section (121) and a fourth hole section (122) with a cross-sectional area smaller than that of the third hole section (121), a second step surface (123) is formed between the third hole section (121) and the fourth hole section (122), the second hanger (32) comprises a second hanger main body (322) penetrating into the fourth hole section (122) and a second stop head (321) located in the third hole section (121), the second step surface (123) is in stop fit with the second stop head (321), and the third hole section (121) is a second tapered hole.

7. The horizontal wellhead plugging device according to claim 6, further comprising a sealing plug (70), wherein the sealing plug (70) is plugged in the third hole section (121).

8. The horizontal well wellhead plugging device according to claim 5, further comprising:

a first sub (60), a first end of the first sub (60) being connected within the first bore section (111);

the plug valve (40) is positioned above the flange plate (10), and the first end of the plug valve (40) is connected with the second end of the first connector (60);

the oil pipe assembly comprises an oil pipe short section (50), and the oil pipe short section (50) is connected with the second end of the plug valve (40).

9. The horizontal wellhead plugging device according to claim 3, characterized in that it further comprises a second joint (80) and a third joint (90), said second joint (80) being connected between said first hanger (31) and said first plugging member (21), said third joint (90) being connected between said second hanger (32) and said second plugging member (22).

10. The horizontal well wellhead plugging device according to claim 1, characterized in that the flange plate (10) further comprises a plurality of connection holes (13) arranged at intervals along the circumferential direction thereof.

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