CN214576876U - Casing head - Google Patents

Abstract

The utility model relates to a casing head, which comprises a sleeve and a flange cover concentrically fixed at the opening at the top of the sleeve; the two short connecting pipes are inserted into the sleeve in a diagonal manner and are communicated with the interior of the sleeve; a movable hole is formed on the inner wall of the opening at the top of the sleeve, a guide ring, a sealing gasket and two arc-shaped pressing rings which are arranged diagonally are also embedded in the movable hole, the guide ring is arranged below the two arc-shaped pressing rings, and the sealing gasket is arranged below the guide ring; the utility model discloses can hold the well head casing string tightly with the help of a plurality of tight pieces of clamp are automatic in the while of mounting flange lid, and then simplified the installation procedure in order to play labour saving and time saving's effect to realized all-round effectual sealed with the help of a plurality of arc sand grips on every tight piece of clamp to the outer wall of well head casing string, and then promoted sealed relatively poor in order to avoid appearing leaking between well head casing string and the casing head of effect by a wide margin.

Description

Casing head

Technical Field

The utility model relates to a casing head.

Background

The casing head is used for fixing a well mouth of a drilling well, and is connected with a well mouth casing string at the same time, so as to support the gravity of a technical casing and an oil layer casing and seal an annular space between layers of pipes; the outer wall of well head casing string is sealed with the help of a plurality of staple bolts to current casing head, and the dismouting of a plurality of staple bolts leads to the installation procedure comparatively loaded down with trivial details, wastes time and energy, moreover because there is the space between the outer wall of staple bolt and well head casing string, can't realize omnidirectional sealed, so sealed effect is relatively poor, and then leads to appearing leaking very easily between well head casing string and the casing head, treats further improvement.

SUMMERY OF THE UTILITY MODEL

To the current situation of above-mentioned prior art, the utility model aims to solve the technical problem that a simplified installation procedure is in order to play labour saving and time saving's effect to realized all-round effectual sealed, and then promoted sealed relatively poor casing head in order to avoid appearing leaking between well head casing string and the casing head of effect by a wide margin.

The utility model provides a technical scheme that above-mentioned technical problem adopted does: a casing head comprises a sleeve and a flange cover concentrically fixed at an opening at the top of the sleeve; the sealing device is characterized in that a movable hole is formed in the inner wall of an opening at the top of the sleeve, a guide ring, a sealing gasket and two arc pressing rings which are diagonally arranged are embedded in the movable hole, the guide ring is arranged below the two arc pressing rings, the sealing gasket is arranged below the guide ring, the bottoms of the two arc pressing rings are both attached to the top of the guide ring, the bottom of the guide ring is attached to the top of the sealing gasket, and the outer wall of the guide ring is attached to the inner wall of the movable hole and can slide up and down; the outer wall of sealed pad and two arc clamping rings all with the inner wall interval certain distance in activity hole, be formed with the bell mouth on the lower extreme opening part inner wall in activity hole, still be equipped with a plurality of tight pieces of clamp that evenly arrange along the circumferencial direction in the bell mouth, every all be formed with the conical surface on the outer wall of the tight piece of clamp, the laminating of conical surface is on the inner wall of bell mouth, and arbitrary two are adjacent press from both sides the equal interval certain distance between the tight piece, every all outwards be formed with a plurality of arc sand grips that down distribute in proper order from the follow on the inner wall of the tight piece of clamp, every the top of pressing from both sides the tight piece all laminates in the bottom of sealed pad.

Preferably, an arc-shaped open slot is formed in the outer wall of each clamping block.

Preferably, an arc-shaped notch groove is formed in the outer edge of the top of each arc-shaped pressing ring.

Preferably, the top of the flange cover is provided with a sealing groove distributed annularly.

Preferably, a detachable pressure gauge and a detachable exhaust valve are further arranged in the two short connecting pipes respectively.

Compared with the prior art, the utility model has the advantages of: the utility model discloses can hold the well head casing string tightly with the help of a plurality of tight pieces of clamp are automatic in the while of mounting flange lid, and then simplified the installation procedure in order to play labour saving and time saving's effect to realized all-round effectual sealed with the help of a plurality of arc sand grips on every tight piece of clamp to the outer wall of well head casing string, and then promoted sealed relatively poor in order to avoid appearing leaking between well head casing string and the casing head of effect by a wide margin.

Drawings

FIG. 1 is a view showing a structure of a top side of the present invention;

fig. 2 is a sectional structure view of the present invention.

Detailed Description

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by those of ordinary skill in the art to which the invention belongs. The use of "first," "second," and similar terms in the description herein do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

To maintain the following description of the embodiments of the present invention clear and concise, detailed descriptions of well-known functions and components may be omitted.

As shown in fig. 1-2, a casing head comprises a sleeve 1 and a flange cover 2 concentrically fixed at an opening at the top of the sleeve 1; the device also comprises two short connecting pipes 3 which are mutually diagonally inserted on the sleeve 1 and are mutually communicated with the interior of the sleeve 1; a movable hole 101 is formed in the inner wall of the opening at the top of the sleeve 1, a guide ring 7, a sealing gasket 9 and two arc-shaped pressing rings 6 which are diagonally arranged with each other are further embedded in the movable hole 101, the guide ring 7 is arranged below the two arc-shaped pressing rings 6, the sealing gasket 9 is arranged below the guide ring 7, the bottoms of the two arc-shaped pressing rings 6 are both attached to the top of the guide ring 7, the bottom of the guide ring 7 is attached to the top of the sealing gasket 9, and the outer wall of the guide ring 7 is attached to the inner wall of the movable hole 101 and can slide up and down; the outer wall of sealed pad 9 and two arc clamping rings 6 all with the inner wall interval certain distance of activity hole 101, be formed with bell mouth 102 on the lower extreme opening part inner wall of activity hole 101, still be equipped with a plurality of tight pieces 8 of clamp that evenly arrange along the circumferencial direction in the bell mouth 102, every outer wall of pressing from both sides tight piece 8 all is formed with conical surface 83, the laminating of conical surface 83 is on the inner wall of bell mouth 102, equal interval certain distance between two arbitrary adjacent tight pieces 8 of clamp, all outwards be formed with a plurality of arc sand grips 81 that down distribute gradually from last on every tight piece 8's of clamp inner wall, every tight piece 8's of clamp top all laminates in the bottom of sealed pad 9.

An arc-shaped open slot 82 is formed on the outer wall of each clamping block 8.

An arc-shaped notch groove 61 is formed in the outer edge of the top of each arc-shaped pressing ring 6.

The top of the flange cover 2 is provided with a sealing groove 21 distributed annularly.

The two short connecting pipes 3 are also respectively provided with a detachable pressure gauge 4 and a detachable exhaust valve 5.

When the device is used, the end part of a wellhead casing string sequentially penetrates through the flange cover 2, the space between the two arc-shaped pressing rings 6, the guide ring 7 and the sealing gasket 9 from top to bottom and is inserted into the space between the clamping blocks 8; then, aligning and fixing the through cover sleeved outside the end part of the wellhead casing string in advance with the flange cover 2, and embedding an O-shaped ring in the sealing groove 21 to play a sealing role; locate protruding circle in the transparent cover and extrude two arc clamping rings 6 downwards, and then promote the inner wall lapse of leading circle 7 along activity hole 101, thereby drive a plurality of tight piece 8 of clamp with the help of sealed pad 9 and all move down, every conical surface 83 that presss from both sides on the tight piece 8 of clamp all follows the inner wall lapse of bell mouth 102 and is close to with each other concentrically, and then press from both sides the tip outer wall of tight well casing string in order to realize fixing, the setting of a plurality of arc sand grips 81 enables to press from both sides and forms good sealed and increase frictional force in order to prevent that the well casing string is pulled out by external force between the tip outer wall of tight piece 8 inner wall of tight casing string and well casing string, the setting of arc open slot 82 has reduced the resistance of pressing from both sides smooth under the tight piece 8.

The pressure gauge 4 is used for monitoring the pressure value in the sleeve 1, and the exhaust valve 5 can exhaust the gas in the sleeve 1 outwards at a proper time so as to adjust the pressure value.

The utility model discloses can hold the well head casing string tightly with the help of a plurality of automatic armful of tight piece 8 of clamp in the time of mounting flange lid 2, and then simplified the installation procedure in order to play labour saving and time saving's effect to realize all-round effectual sealed with the help of a plurality of arc sand grips 81 on every tight piece 8 of clamp to the outer wall of well head casing string, and then promoted sealed relatively poor in order to avoid appearing leaking between well head casing string and the casing head of effect by a wide margin.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that various changes in the embodiments and modifications thereof may be made, and equivalents may be substituted for elements thereof; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims (5)

1. A casing head comprises a sleeve and a flange cover concentrically fixed at an opening at the top of the sleeve; the sealing device is characterized in that a movable hole is formed in the inner wall of an opening at the top of the sleeve, a guide ring, a sealing gasket and two arc pressing rings which are diagonally arranged are embedded in the movable hole, the guide ring is arranged below the two arc pressing rings, the sealing gasket is arranged below the guide ring, the bottoms of the two arc pressing rings are both attached to the top of the guide ring, the bottom of the guide ring is attached to the top of the sealing gasket, and the outer wall of the guide ring is attached to the inner wall of the movable hole and can slide up and down; the outer wall of sealed pad and two arc clamping rings all with the inner wall interval certain distance in activity hole, be formed with the bell mouth on the lower extreme opening part inner wall in activity hole, still be equipped with a plurality of tight pieces of clamp that evenly arrange along the circumferencial direction in the bell mouth, every all be formed with the conical surface on the outer wall of the tight piece of clamp, the laminating of conical surface is on the inner wall of bell mouth, and arbitrary two are adjacent press from both sides the equal interval certain distance between the tight piece, every all outwards be formed with a plurality of arc sand grips that down distribute in proper order from the follow on the inner wall of the tight piece of clamp, every the top of pressing from both sides the tight piece all laminates in the bottom of sealed pad.

2. The casing head as claimed in claim 1, wherein each of the clamp blocks has an arcuate slot formed in an outer wall thereof.

3. The casing head according to claim 1 wherein each arcuate clamping ring has an arcuate notch formed in a top outer edge thereof.

4. The casing head according to claim 1, wherein the top of the flange cover is provided with circumferentially distributed sealing grooves.

5. The casing head of claim 1 wherein a removable pressure gauge and vent valve are provided in each of the two nipples.

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