Wellhead sealing structure for large-diameter well drilling

Abstract

The utility model belongs to the technical field of well mouth sealing structures, and particularly relates to a well mouth sealing structure for large-diameter well drilling, which comprises a mounting cover, a connecting shell is fixedly connected to the lower end of the mounting cover, a boss is fixedly connected to the lower end of the mounting cover, and a sealing ring is slidably connected to the inside of the boss. And a connecting plate is fixedly connected to the interior of the sealing ring, a fixing rod is fixedly connected to the lower end of the mounting cover, the fixing rod and the connecting plate are slidably connected in a sleeving mode, and a spring is arranged on the outer side of the fixing rod. By arranging the sealing ring, the sealing performance between the boss and a drilling well can be improved, and by arranging the limiting nail, the threaded rod and other components, the threaded rod can be rotated to drive the limiting nail to be inserted into the land, so that the installation cover is limited, and the problem that the installation cover is damaged due to the fact that part of drilling well mouths are not provided with connecting flanges is solved. And an effective sealing effect cannot be achieved when the wellhead is mounted.

Description

Technical Field

[0001] The utility model relates to the technical field of wellhead sealing structures, in particular to a wellhead sealing structure used for large-diameter drilling. Background Art

[0002] Drilling is a process of drilling a hole underground using a drilling tool to extract or explore natural resources such as oil, gas, water or minerals. Drilling is commonly used by fields such as oilfield exploration and development, water well construction and mine exploration. According to the utility model with patent authorization announcement number CN207122292U, a wellhead sealing structure for large-diameter drilling is disclosed, including an outer sleeve arranged on the inner wall of the wellhead, a wellhead flange is installed on the top of the outer sleeve, the wellhead flange includes an upper flange and a lower flange connected together by bolts, an inner sleeve is coaxially fixed in the middle of the wellhead flange, a sealing ring is provided between the upper flange and the lower flange, which is close to the inner sleeve and is called the first-level seal, a sealing short pipe is threadedly connected to the top of the inner sleeve, a secondary sealing mechanism is connected to the sealing short pipe through a sealing flange, a drill pipe sealer is provided above the sealing plug in the sealing pipe column, which is called the third-level seal, and a cuttings discharge port is provided on the sealing pipe column below the rotating bearing; so that when the left sealing component and the right sealing component are closed, the two latex sealing blocks are pressed together tightly, which has a better sealing effect on the contact surface. However, since some drilling wellheads are not equipped with connecting flanges, the wellhead cannot achieve an effective sealing effect during installation. Utility Model Content

[0003] The utility model aims to provide a wellhead sealing structure for large-diameter drilling, which solves the problem that the wellhead cannot achieve an effective sealing effect during installation because some drilling wellheads are not equipped with connecting flanges.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a wellhead sealing structure for large-diameter drilling, comprising a mounting cover, the lower end of the mounting cover is fixedly connected to a connecting shell, the lower end of the mounting cover is fixedly connected to a boss, the inside of the boss is slidably connected to a sealing ring, the inside of the sealing ring is fixedly connected to a connecting plate, the lower end of the mounting cover is fixedly connected to a fixing rod, the fixing rod is slidably sleeved with the connecting plate, a spring is provided on the outside of the fixing rod, the mounting cover and the outside of the connecting shell are fixedly connected to a mounting box, the inside of the mounting box is slidably connected to a mounting plate, the lower end of the mounting plate is fixedly connected to a limiting pin, and the inside of the mounting box is connected to a threaded rod through a bearing.

[0005] Preferably, a slide groove is provided inside the boss, and a connecting plate is slidably connected inside the slide groove. The design of the slide groove can facilitate the sealing ring to drive the connecting plate to move.

[0006] Preferably, the lower end of the fixing rod is fixedly connected to a limiting plate, and the limiting plate is in contact with the connecting plate. The limiting plate can play a limiting role on the connecting plate through the design of the limiting plate.

[0007] Preferably, one end of the spring contacts the mounting cover, and the other end of the spring contacts the connecting plate. Through the design of the spring, the spring can drive the sealing ring to fit with the drilling wellhead.

[0008] Preferably, the number of the installation boxes is four, and the four installation boxes are distributed in a ring shape on the outer side of the installation cover. Through the design of the installation boxes, they can be used to install limit pins.

[0009] Preferably, the number of the limiting pins at the lower end of each mounting plate is two, and both of the limiting pins are slidably connected to the mounting box. The design of the limiting pins can play a limiting role on the mounting cover.

[0010] Preferably, the threaded rod is connected to the mounting plate via threads, and the position of the limiting pin can be adjusted through the design of the threaded rod.

[0011] Preferably, a knob is fixedly connected to the upper end of the threaded rod, and the knob is in contact with the installation box. The threaded rod can be easily rotated through the design of the knob.

[0012] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0013] 1. The utility model can increase the sealing between the boss and the drilling well by providing a sealing ring, and by providing components such as limit pins and threaded rods, the threaded rods can be rotated to drive the limit pins to be inserted into the ground, thereby limiting the installation cover, solving the problem that some drilling wellheads are not equipped with connecting flanges, resulting in the wellhead being unable to achieve an effective sealing effect during installation.

[0014] 2. The utility model is provided with connecting blocks, fixing plates, springs and other components, and the elastic force of the spring can drive the sealing ring to always fit with the drilling wellhead, thereby effectively increasing the sealing between the boss and the drilling wellhead, and the closer the distance between the installation cover and the drilling wellhead, the higher the fit between the sealing ring and the drilling wellhead. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The overall structure of the utility model is three-dimensional Figure 1 ;

[0016] Figure 2 For the utility model Figure 1 A three-dimensional diagram of the local structure;

[0017] Figure 3 The overall structure of the utility model is three-dimensional Figure 2 ;

[0018] Figure 4 For the utility model Figure 3 A magnified view of the structure of section A.

[0019] In the figure: 1. Installation cover; 2. Connecting shell; 3. Boss; 4. Sealing ring; 5. Connecting plate; 51. Slide groove; 52. Fixing rod; 53. Limiting plate; 54. Spring; 6. Installation box; 61. Installation plate; 62. Limiting nail 63. Threaded rod; 64. Knob. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] Please refer to Figure 4, a wellhead sealing structure for large-diameter drilling, including a mounting cover 1, a connecting shell 2 is fixedly connected to the lower end of the mounting cover 1, a boss 3 is fixedly connected to the lower end of the mounting cover 1, a sealing ring 4 is slidably connected to the inside of the boss 3, a connecting plate 5 is fixedly connected to the inside of the sealing ring 4, a slide groove 51 is provided inside the boss 3, a connecting plate 5 is slidably connected to the inside of the slide groove 51, and the sealing ring 4 can conveniently drive the connecting plate 5 to move by the design of the slide groove 51, the lower end of the mounting cover 1 is fixedly connected to a fixing rod 52, the fixing rod 52 is slidably sleeved with the connecting plate 5, the lower end of the fixing rod 52 is fixedly connected to a limiting plate 53, the limiting plate 53 is in contact with the connecting plate 5, and the limiting plate 53 can play a limiting role on the connecting plate 5 by the design of the limiting plate 53.

[0022] See also Figure 2-4 A spring 54 is provided on the outer side of the fixing rod 52, one end of the spring 54 contacts the mounting cover 1, and the other end of the spring 54 contacts the connecting plate 5. Through the design of the spring 54, the spring 54 can drive the sealing ring 4 to fit with the drilling wellhead. The mounting cover 1 and the outer side of the connecting shell 2 are fixedly connected with a mounting box 6. The number of the mounting boxes 6 is four, and the four mounting boxes 6 are distributed in a ring shape on the outer side of the mounting cover 1. Through the design of the mounting box 6, it can be used to install the limit nail 62.

[0023] See also Figure 2-4The interior of the mounting box 6 is slidably connected with a mounting plate 61, and the lower end of the mounting plate 61 is fixedly connected with a limiting nail 62. There are two limiting nails 62 at the lower end of each mounting plate 61, and the two limiting nails 62 are slidably connected to the mounting box 6. Through the design of the limiting nails 62, the mounting cover 1 can be limited. The interior of the mounting box 6 is connected with a threaded rod 63 through a bearing, and the threaded rod 63 is threadedly connected to the mounting plate 61. Through the design of the threaded rod 63, the position of the limiting nail 62 can be adjusted, and the upper end of the threaded rod 63 is fixedly connected with a knob 64, and the knob 64 contacts the mounting box 6. Through the design of the knob 64, the threaded rod 63 can be easily rotated.

[0024] The specific implementation process of the utility model is as follows: when in use, the connecting shell 2 at the lower end of the installation cover 1 is sleeved with the wellhead of the drilling well, and then the knob 64 is turned to make the knob 64 drive the threaded rod 63 to rotate, so that the threaded rod 63 and the installation plate 61 can have a threaded movement, so that the installation plate 61 can move on the threaded rod 63, and the installation plate 61 can drive the limiting nail 62 to slide in the installation box 6, so that the limiting nail 62 is inserted into the ground, and the installation cover 1 can be installed on the drilling well, and when the installation cover 1 is close to the wellhead of the drilling well, the installation cover 1 will The boss 3 is driven to move, so that the boss 3 drives the sealing ring 4 to contact with the drilling wellhead. After the sealing ring 4 contacts with the drilling wellhead, if the installation cover 1 can still move in the direction close to the drilling wellhead, the installation cover 1 will drive the boss 3 to move on the sealing ring 4, so that the installation cover 1 drives the fixing rod 52 to slide in the connecting plate 5, so that the installation cover 1 cooperates with the connecting plate 5 to squeeze the spring 54, so that the elastic force of the spring 54 drives the sealing ring 4 on the connecting plate 5 to fit with the drilling wellhead, thereby effectively increasing the sealing between the boss 3 and the drilling wellhead.

[0025] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A wellhead sealing structure for large diameter drilling, comprising a mounting cover (1), characterized in that: The lower end of the mounting cover (1) is fixedly connected to a connecting shell (2), the lower end of the mounting cover (1) is fixedly connected to a boss (3), the interior of the boss (3) is slidably connected to a sealing ring (4), the interior of the sealing ring (4) is fixedly connected to a connecting plate (5), the lower end of the mounting cover (1) is fixedly connected to a fixing rod (52), the fixing rod (52) is slidably sleeved with the connecting plate (5), a spring (54) is arranged on the outer side of the fixing rod (52), the outer sides of the mounting cover (1) and the connecting shell (2) are fixedly connected to a mounting box (6), the interior of the mounting box (6) is slidably connected to a mounting plate (61), the lower end of the mounting plate (61) is fixedly connected to a limiting pin (62), and the interior of the mounting box (6) is connected to a threaded rod (63) via a bearing.

2. A wellhead sealing structure for large diameter drilling according to claim 1, characterized in that: A sliding groove (51) is provided inside the boss (3), and a connecting plate (5) is slidably connected inside the sliding groove (51).

3. A wellhead sealing structure for large diameter drilling according to claim 1, characterized in that: The lower end of the fixing rod (52) is fixedly connected to a limiting plate (53), and the limiting plate (53) is in contact with the connecting plate (5).

4. A wellhead sealing structure for large diameter drilling according to claim 1, characterized in that: One end of the spring (54) contacts the mounting cover (1), and the other end of the spring (54) contacts the connecting plate (5).

5. The wellhead sealing structure for large diameter drilling according to claim 1, characterized in that: The number of the installation boxes (6) is four, and the four installation boxes (6) are distributed in a ring shape on the outer side of the installation cover (1).

6. A wellhead sealing structure for large diameter drilling according to claim 1, characterized in that: The number of the limiting pins (62) at the lower end of each mounting plate (61) is two, and the two limiting pins (62) are both slidably connected to the mounting box (6).

7. A wellhead sealing structure for large diameter drilling according to claim 1, characterized in that: The threaded rod (63) is connected to the mounting plate (61) via threads.

8. The wellhead sealing structure for large diameter drilling according to claim 1, characterized in that: The upper end of the threaded rod (63) is fixedly connected with a knob (64), and the knob (64) is in contact with the installation box (6).

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