CN114592825A - Universal protective cover for open-air well cementation of casing head - Google Patents

Abstract

The invention discloses a general protective cover for casing head open-air cementing, comprising: a bottom cover plate and a casing cover body; a through hole is opened in the center of the bottom cover plate; the entrance of the casing cover body and the edge of the through hole Fixed connection and sealed connection; at least one fixing rod is also fixedly arranged on the surface of the bottom cover plate facing away from the casing body; the fixing rod is provided with a locking nut; the fixing rod passes through the flange hole of the outer casing head and The lock nut is threaded; the casing covers the end of the outer production casing. The invention can prevent external substances from entering the wellbore through the production casing, and can prevent the end of the production casing from being exposed and damaged in nature. The bottom cover plate can better shield the gasket groove and the exposed surface of the casing head, avoid corrosion or damage to the gasket groove and the exposed surface of the casing head, and thus form a better protection for the casing head.

Description

A universal protective cover for casing head open-air cementing

technical field

The invention belongs to the technical field of wellhead equipment for oil and gas wells, and in particular relates to a general protective cover for casing head open-air cementing.

Background technique

The casing head is used to fix the wellhead of the developed well, connect the surface casing of the wellhead and the production casing, to connect the supporting surface casing and the production casing, and to seal the surface casing and the production casing on the surface of the surface. The annular space of the wellhead provides transitional connections for the installation of tubing heads and Christmas trees. When the production well does not need to carry out production work, it is necessary to seal the end of the production casing extending out of the casing head for a certain period of time to prevent external substances from entering the wellbore, and the casing head needs to be protected to a certain extent. , to avoid the casing head being corroded and damaged in the open air. Usually, an ordinary iron sheet cover is covered on the end of the production casing. However, the ordinary iron sheet cover can be opened and lost arbitrarily, or blown off by the strong wind of nature, which protects the casing head. It has poor performance and cannot protect the end of the production sleeve.

SUMMARY OF THE INVENTION

In order to solve the above problems existing in the prior art, the present invention provides a general protective cover for casing head open-air cementing. The technical problem to be solved by the present invention is realized by the following technical solutions:

A general protective cover for casing head open-air cementing, comprising: a bottom cover plate and a casing cover;

The center of the bottom cover plate is provided with a through hole; the inlet of the sleeve cover is fixedly connected and sealed with the edge of the through hole;

At least one fixing rod is also fixedly arranged on the surface of the bottom cover plate facing away from the casing body;

The fixing rod is vertically arranged, and a locking nut is arranged on the fixing rod; the fixing rod passes through the flange hole of the outer casing head and is threadedly connected with the locking nut; the casing cover is sleeved On the end of the outer production sleeve.

In one embodiment of the present invention, it also includes a lead seal assembly;

The locking nut is provided with at least one connecting through hole; the connecting through hole is located on the side of the threaded hole of the locking nut;

The connection through hole is connected with the lead seal assembly.

In an embodiment of the present invention, the number of the fixing rods is multiple, and the multiple fixing rods are evenly distributed on the bottom cover; the number of the locking nuts is the same as the number of the fixing rods same;

The connecting through holes of each of the locking nuts are connected with the lead seal assembly.

In an embodiment of the present invention, the number of the fixing rods is four;

The four fixing rods are arranged opposite to each other, and the four fixing rods are distributed in a cross shape.

In an embodiment of the present invention, each of the locking nut has two connecting through holes; the two connecting through holes are respectively located on two sides of the threaded hole.

In an embodiment of the present invention, the casing body is in the shape of a hollow truncated cone; and the bottom cover plate is circular.

Beneficial effects of the present invention:

In the present invention, the sleeve cover body is sleeved on the end of the production sleeve extending out of the sleeve head, the bottom cover plate can cover the surface of the sleeve head, and the bottom cover plate is fixed on the sleeve by the fixing rod and the locking nut On the flange of the pipe head, the protective cover is not easy to be opened, so as to have a better sealing effect on the production casing, which can not only prevent external substances from entering the wellbore through the production casing, but also effectively avoid the production casing. The exposed end of the pipe is rusted and damaged by the erosion of nature, which has a protective effect on the end of the production casing. At the same time, the bottom cover plate can better shield the surface of the backing groove of the casing head, so as to prevent the surface of the backing groove of the casing head from being rusted, corroded or damaged, thereby forming a better protection for the casing head. Extends the service life of the casing head. The protective cover of the invention has the advantages of simple structure, convenient operation and convenient use.

The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

Description of drawings

1 is a schematic structural diagram of a general protective cover for casing head open-air cementing provided by an embodiment of the present invention;

Fig. 2 is the enlarged view of A part of Fig. 1;

3 is a schematic structural diagram of another general protective cover for casing head open-air cementing provided by an embodiment of the present invention.

Description of reference numbers:

10-bottom cover plate; 11-through hole; 20-sleeve cover body; 30-fixed rod; 40-lock nut; 41-connection through hole; 50-sleeve head; 51-flange hole; 52-production Sleeve; 53-groove groove; 60-lead seal assembly.

Detailed ways

The present invention will be described in further detail below with reference to specific embodiments, but the embodiments of the present invention are not limited thereto.

Example 1

Referring to FIG. 1 , a general protective cover for casing head open-air cementing includes: a bottom cover plate 10 and a casing cover body 20 . A through hole 11 is formed in the center of the bottom cover 10 . The inlet of the casing body 20 is fixedly and sealedly connected with the edge of the through hole 11 . The sleeve housing 20 is fitted over the end of the outer production sleeve 52 . In this embodiment, the end of the production sleeve 52 extending out of the sleeve head 50 may penetrate into the sleeve cover 20 from the entrance of the sleeve cover 20 .

At least one fixing rod 30 is also fixedly disposed on the surface of the bottom cover plate 10 facing away from the casing body 20 . The fixing rod 30 is arranged vertically, and a locking nut 40 is arranged on the fixing rod 30 . The fixing rod 30 is screwed to the lock nut 40 through the flange hole 51 of the outer sleeve head 50 . The casing body 20 and the fixing rod 30 are respectively located on both sides of the bottom cover plate 10 . The position of the fixing rod 30 may correspond to the position of the flange hole 51 .

In this embodiment, when the protective cover is used, the casing body 20 is put on the end of the production casing 52, and at the same time, the fixing rod 30 passes through the flange hole 51 of the casing head 50, and then the locking nut 40 Tighten from the lower end of the fixing rod 30 to form a fastening between the fixing rod 30 and the flange of the casing head 50, so the protective cover is not easy to be lifted and damaged. The bottom cover plate 10 covers the surface of the casing head 50 to protect the backing groove 53 of the casing head 50 and the surface of the casing head 50 . Moreover, the production casing 52 is well sealed, which not only prevents external substances from entering the wellbore through the production casing 52, but also prevents the end of the production casing 52 from being exposed in nature. If damaged, the end of the production sleeve 52 is protected. At the same time, the bottom cover plate 10 can better shield the surface of the backing groove 53 of the casing head 50 to prevent the surface of the backing groove 53 of the casing head 50 from being corroded or damaged, thereby preventing the surface of the casing head 50 from being corroded or damaged. Better protection is formed and the service life of the casing head 50 is prolonged. The protective cover of the invention has the advantages of simple structure, convenient operation and convenient use.

Wherein, before installing the protective cover, lithium-based lubricating oil may be coated on the surface of the casing head 50 and the surface of the backing ring groove 53 to a thickness of about 0.5 mm.

In a feasible implementation manner, the material of the bottom cover plate 10 and the sleeve cover body 20 is color steel plate, galvanized plate, herdizing plate or stainless steel plate. The material of the fixing rod 30 and the locking nut 40 is stainless steel or carbon steel, and the surface is treated with anti-corrosion treatment such as galvanizing.

Further, as shown in FIG. 1 , FIG. 2 and FIG. 3 , a general protective cover for casing head open-air cementing further includes a lead sealing assembly 60 . At least one connecting through hole 41 is formed on the locking nut 40 . The connecting through hole 41 is located on the side of the threaded hole of the lock nut 40 . The connecting through hole 41 and the threaded hole are independent and staggered from each other, and the communicating through hole 41 and the threaded hole do not pass through. The connecting through holes 41 are connected to the lead sealing assembly 60 . In this embodiment, the wire rope of the lead seal assembly 60 can pass through the connecting through hole 41 to connect all the locking nuts 40 of the device into a whole to further lock, and the locking nuts 40 cannot be directly unscrewed, which further prevents the The protective cover is removed for improved reliability.

In this embodiment, when the number of the fixing rods 30 is one, the connecting through hole 41 and the flange hole 51 of the sleeve head 50 can be connected by the lead sealing assembly 60, for example, the wire rope of the lead sealing assembly 60 can be connected through the connection The through hole 41 is wound on the flange hole 51 of the casing head 50 and the wire rope is locked by the locking member of the lead seal assembly 60, and the lock nut 40 cannot be directly unscrewed. When the number of the fixing rods 30 is multiple, there are multiple locking nuts 40, and the wire ropes of the lead seal assembly 60 pass through the connecting through holes 41 of each locking nut 40 into a whole and lock them together. Can.

In this embodiment, the connecting through hole 41 is located on the axial side wall of the locking nut 40 , the connecting through hole 41 is a transverse hole, and the axial direction of the connecting through hole 41 is perpendicular to the axial direction of the threaded hole.

In a feasible implementation manner, the connecting through holes 41 are located on the radial wall surface of the locking nut 40 , and the connecting through holes 41 are arranged in parallel with the threaded holes.

In a feasible implementation manner, the lead seal assembly 60 adopts a tightening type disposable lead seal, and the steel wire of the lead seal assembly 60 can pass through each connection through hole 41 and be locked.

Further, as shown in FIG. 1 and FIG. 3 , the number of the fixing rods 30 is multiple, and the multiple fixing rods 30 are evenly distributed on the bottom cover plate 10 . The number of lock nuts 40 is the same as that of the fixing rods 30 . The connecting through holes 41 of each locking nut 40 are connected with the lead sealing assembly 60 . In this embodiment, the number of the fixing rods 30 is multiple and all of them are arranged, which improves the stability of the protective cover. The steel wire rope that comes with the lead seal assembly 60 can pass through the connecting through holes 41 of each locking nut 40 to form a whole and lock them.

Further, the number of the fixing rods 30 is four. The four fixing rods 30 are arranged opposite to each other, and the four fixing rods 30 are distributed in a cross shape.

Further, as shown in FIGS. 1 and 3 , each locking nut 40 has two connecting through holes 41 . The two connecting through holes 41 are respectively located on both sides of the threaded hole. In this embodiment, the two connecting through holes 41 on each locking nut 40 can be connected to the lead seal assembly 60, which further prevents the locking nut 40 from being disassembled, thereby improving reliability.

Further, as shown in FIG. 1 , the casing body 20 is in the shape of a hollow truncated cone. The bottom cover 10 is circular. The maximum diameter of the bottom cover plate 10 may be larger than the maximum diameter of the flange of the casing head 50 . The hollow portion of the sleeve housing 20 accommodates the end of the production sleeve 52 .

In this embodiment, when making the protective cover, a circular plate can be directly cut from the raw material of the bottom cover plate 10 as the top cover of the sleeve cover body 20, and the top cover needs to be polished (the diameter of the top cover becomes smaller) Then, it is sealed and welded with the cover cylinder of the sleeve cover body 20, so after the fabrication is completed, a hollow circular truncated shape is formed. In this way, production materials can be saved.

In a feasible implementation manner, the casing body 20 is in the shape of a hollow cylinder. The bottom cover 10 is circular.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", " rear, left, right, vertical, horizontal, top, bottom, inside, outside, clockwise, counterclockwise, etc., or The positional relationship is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, Therefore, it should not be construed as a limitation of the present invention.

In addition, the terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature defined as "first" or "second" may expressly or implicitly include one or more of that feature. In the description of the present invention, "plurality" means two or more, unless otherwise expressly and specifically defined.

In the present invention, unless otherwise expressly specified and limited, the terms "installed", "connected", "connected", "fixed" and other terms should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection , or integrated; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of the two elements or the interaction relationship between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

In the present invention, unless otherwise expressly specified and limited, a first feature "on" or "under" a second feature may include the first and second features in direct contact, or may include the first and second features Not directly but through additional features between them. Also, the first feature being "above", "over" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is level higher than the second feature. The first feature is "below", "below" and "below" the second feature includes the first feature being directly below and diagonally below the second feature, or simply means that the first feature has a lower level than the second feature.

In the description of this specification, description with reference to the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples", etc., mean specific features described in connection with the embodiment or example , structure, material or feature is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art may combine and combine the different embodiments or examples described in this specification.

The above content is a further detailed description of the present invention in combination with specific preferred embodiments, and it cannot be considered that the specific implementation of the present invention is limited to these descriptions. For those of ordinary skill in the technical field of the present invention, without departing from the concept of the present invention, some simple deductions or substitutions can be made, which should be regarded as belonging to the protection scope of the present invention.

Claims (7)

1. The utility model provides a general protection casing of casing head open-air cementing which characterized in that includes: a bottom cover plate (10) and a casing cover body (20);

a through hole (11) is formed in the center of the bottom cover plate (10); the inlet of the sleeve cover body (20) is fixedly connected and hermetically connected with the edge of the through hole (11);

at least one fixing rod (30) is fixedly arranged on the surface of the bottom cover plate (10) back to the sleeve cover body (20);

the fixing rod (30) is vertically arranged, and a locking nut (40) is arranged on the fixing rod (30); the fixing rod (30) penetrates through a flange hole (51) of an external casing head (50) and is in threaded connection with the locking nut (40); the casing cover (20) is fitted over the end of an external production casing (52).

2. The casing head open-air cementing universal shield according to claim 1, further comprising a lead seal assembly (60);

the locking nut (40) is provided with at least one connecting through hole (41); the connecting through hole (41) is positioned on the side surface of the threaded hole of the locking nut (40);

the connecting through hole (41) is connected with the lead sealing assembly (60).

3. The casing head open-air cementing universal shield according to claim 2, characterized in that the number of the fixing rods (30) is plural, and the plural fixing rods (30) are evenly distributed on the bottom cover plate (10); the number of the locking nuts (40) is the same as that of the fixing rods (30);

the connecting through hole (41) of each locking nut (40) is connected with the lead seal assembly (60).

4. The casing head open-air cementing universal shield according to claim 3, wherein the number of the fixing rods (30) is four;

the four fixing rods (30) are oppositely arranged in pairs, and the four fixing rods (30) are distributed in a cross shape.

5. The casing head open-air cementing universal shield according to claim 4, wherein each of the locking nuts (40) has two connecting through holes (41); the two connecting through holes (41) are respectively positioned at two sides of the threaded hole.

6. The universal casing head shield for open-air cementing according to claim 1, wherein the casing head (20) is in the shape of a hollow circular truncated cone; the bottom cover plate (10) is circular.

7. The casing head open-air cementing universal shield according to claim 1, characterized in that the casing head (20) is in the shape of a hollow cylinder; the bottom cover plate (10) is circular.

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