CN213235005U - A right supplementary seal cover for well head rebuilds device - Google Patents

Abstract

The utility model discloses a righting auxiliary seal cover for well head rebuilding device belongs to the oil gas well head rebuilding technical field of being out of control, right the cover including the annular, annular elastic seal cover, the annular is right in the cavity that the cover is fixed in sleeve pipe sealing device, the annular is right and is provided with fixed knot on sheatheeing in and is constructed, fixed knot constructs for circumference evenly sets up 4 bolt-up structures on the cover is right to the annular, annular elastic seal cover inlay in the annular is right, annular elastic seal cover contacts with the sleeve pipe upper end at right auxiliary seal cover during operation, in order to realize the annular is right cover and the sealed cooperation of sleeve pipe upper end. The utility model discloses can solve prior art, sleeve pipe sealing device's front end is sealed and sleeve pipe out of plumb, leads to sleeve pipe sealing device to appear sealed not tight technical problem, can effectively guarantee the sealed effect between sleeve pipe sealing device and the sleeve pipe, improves and rebuilds well head operating efficiency, reduces the number of times that the personnel of speedily carrying out rescue work are close to the well head operation.

Description

A right supplementary seal cover for well head rebuilds device

Technical Field

The utility model relates to an oil gas well head of out of control rebuilds technical field, concretely relates to an auxiliary seal cover of rightting for well head rebuilds device.

Background

The most critical step of emergency rescue after the out-of-control blowout of oil and gas well catches fire is to rebuild the well head, and the rebuilt well head needs to deal with two kinds of situations: bottomed flanges and bottomless flanges. The well mouth reconstruction without the bottom flange is an important technology for the fire emergency operation of the out-of-control blowout of the oil and gas well, is the last step of the well mouth reconstruction in the emergency rescue and is the most critical step, and is the highest link in the emergency rescue and rescue. At present, a common method for rebuilding a wellhead aiming at a light casing without a bottom flange is to rebuild the wellhead by using an integral wellhead rebuilding device of an out-of-control well. An integrated wellhead reconstruction device for an out-of-control well mainly comprises a full-seal ram blowout preventer, a four-way joint, a sleeve sealing device, a sleeve clamping device, a guide device and the like. When the integrated wellhead reconstruction device is adopted to reconstruct a wellhead, the integrated wellhead resetting device of the out-of-control well is integrated with the gravity pressurizing device through hydraulic reconstruction. The integrated wellhead reconstruction device realizes centering, pressurization, sleeve clamping, sleeve sealing and the like by utilizing the walking, pressurization, drill mast inclination angle adjustment, power head rotation function, hydraulic control pressure source and the like of the gravity pressurization device, wherein the key component for starting the sleeve sealing is the sleeve sealing device.

The sleeve sealing device is similar to a ram blowout preventer, and the sealing principle of the sleeve sealing device is that a hydraulic cylinder piston pushes a ram shaft under the action of hydraulic pressure to enable the ram to be pushed to be closed, the front end seal, the side door seal, the ram shaft seal and the bottom end seal of the ram are required to be effective at the same time to realize sleeve sealing, and the front end seal is in direct contact with a sleeve, so that the sealing effect of the sleeve sealing device is particularly important.

In order to solve the problem of casing sealing, Chinese patent literature with the publication number of CN109403903A and the publication number of 2019, 3 and 1 discloses an integrated wellhead device for emergency rescue of oil and gas wells, which mainly comprises a casing sealing device, a casing clamping device and a flow guide device, and specifically discloses that the casing sealing device comprises a limiting mechanism and a sealing block, wherein the limiting mechanism is a step for blocking a casing, and the sealing block is arranged in the casing sealing device and is used for being in contact with the casing. In addition, chinese patent publication No. CN108412447A, published as 2018, 8.17 discloses a wellhead device for out-of-control blowout of oil and gas wells, which specifically comprises a body, a fully-closed seal assembly, a sleeve seal assembly, a slip assembly, an anti-sinking slip, a locking shaft, a hydraulic cylinder, a locking shaft seat and a side door, and specifically discloses that a bottom seal rubber block is arranged on the lower end face of the sleeve seal assembly, a front end seal rubber block is arranged on the front end, and the two fully-closed seal assemblies are closed under the action of a hydraulic piston rod to realize the seal of an upper channel of the wellhead.

However, the working condition of the integrated wellhead reconstruction device of the out-of-control well is that the sleeve sealing device is sleeved under the condition that the sleeve is open-blown until the top end of the sleeve is contacted with the sleeve limiting step, and the gate plate assembly is closed to complete sleeve sealing. The front end seal can be eroded and abraded by well-jet fluid flowing through the front end of the flashboard, in the fluid impact process, the sleeve sealing device can slightly shake, the front end seal is not perpendicular to the sleeve, the sleeve sealing device is prone to poor sealing, and fluid leaks from the lower portion of the sleeve sealing device.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a righting auxiliary seal cover for well head is rebuild device to among the solution prior art, casing seal device's front end is sealed and the sleeve pipe out of plumb, leads to casing seal device to appear sealed not tight easily, the technical problem that the fluid leaked from casing seal device lower part.

The utility model is realized by adopting the following technical scheme.

The utility model provides a righting auxiliary seal cover for well head rebuilding device, right the cover including the annular, annular elastic seal cover, the annular is right the cover and is fixed in the cavity of sleeve pipe sealing device, the annular is right to be provided with fixed knot and is constructed, fixed knot constructs for circumference evenly sets up 4 bolt-up structures on the cover is right to the annular, annular elastic seal cover inlay in the annular is right in the cover, annular elastic seal cover contacts with the sleeve pipe upper end at righting auxiliary seal cover during operation, in order to realize the sealed cooperation in cover and sleeve pipe upper end is right to the annular.

Preferably, the cross section of the annular centering sleeve along the axial direction is in an inverted L shape, the annular centering sleeve is composed of an upper section and a lower section which are integrally formed, the fixing structure is arranged on the upper section of the annular centering sleeve, and the lower section of the annular centering sleeve has a certain height.

Preferably, the bolt fastening structure comprises a threaded hole and a bolt, the threaded hole is formed in the wall of the upper section of the annular centralizing sleeve, and the bolt is in threaded fit with the threaded hole.

Preferably, the annular elastic sealing sleeve is embedded at the joint of the upper section and the lower section of the annular centering sleeve, and the section of the annular elastic sealing sleeve along the axial direction is in an inverted L shape.

Preferably, the bottom end of the lower section of the annular centralizing sleeve is provided with a chamfer used for guiding the sleeve.

Preferably, the annular centering sleeve is provided with a groove for embedding the annular elastic sealing sleeve.

Compared with the prior art, the utility model, following beneficial effect has:

(1) the auxiliary righting sealing sleeve for the wellhead reconstruction device is arranged in a cavity of the casing sealing device, particularly in a casing limiting step area, a combination mode of an annular righting sleeve and an annular elastic sealing sleeve is adopted, the annular righting sleeve plays a role in fixing the whole righting auxiliary sealing sleeve on one hand, and plays a role in righting a guide casing in the wellhead reconstruction process on the other hand, so that the casing can be perpendicular to the front end in a sealing mode, and the effect of tight sealing of the front end of the casing sealing device is favorably realized; the annular elastic sealing sleeve is positioned at the position of the sleeve limiting step and directly contacts with the upper end face of the sleeve in the well mouth reconstruction process, so that the annular centering sleeve is in sealing fit with the upper end of the sleeve, the auxiliary sealing effect of the upper end of the sleeve and the sleeve limiting step is realized by the aid of the gravity applying pressure at the position of the sleeve limiting step, and the sealing effect of the sleeve sealing device is safer and more reliable.

(2) The centralizing auxiliary sealing sleeve for the wellhead reconstruction device can effectively ensure the sealing effect between a sleeve sealing device and a sleeve in the integrated wellhead reconstruction device, improve the wellhead reconstruction operation efficiency and reduce the times of emergency personnel near the wellhead operation.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Figure 1 is the utility model discloses a structural schematic of a supplementary seal cover of rightting for well head is rebuild the device.

Reference numerals: 1-annular centering sleeve, 2-annular elastic sealing sleeve, 3-bolt fastening structure, 4-chamfer and 5-groove.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to the attached drawing 1, the embodiment provides a righting auxiliary sealing sleeve for a wellhead reconstruction device, which comprises an annular righting sleeve 1 and an annular elastic sealing sleeve 2, wherein the annular righting sleeve 1 is fixed in a cavity of a casing sealing device, the annular righting sleeve 1 is provided with a fixing structure, the fixing structure is 4 bolt fastening structures 3 which are circumferentially and uniformly arranged on the annular righting sleeve 1, the annular elastic sealing sleeve 2 is embedded in the annular righting sleeve 1, and the annular elastic sealing sleeve 2 is in contact with the upper end of a casing when the righting auxiliary sealing sleeve works, so that the annular righting sleeve 1 is in sealing fit with the upper end of the casing.

It should be noted that, a righting auxiliary seal cover for well head reconstruction device, just pre-install inside sleeve pipe sealing device's cavity when assembling well head reconstruction device in the early stage, concrete position is the spacing step region of sleeve pipe in the sleeve pipe sealing device, rebuild the in-process at the well head, need rebuild the device handling with the well head to spout out of control directly over, slowly transfer, reach sleeve pipe sealing device's spacing step department in the well head reconstruction device up to the sleeve pipe of well head, then stop transferring, through remote operation, make sleeve pipe sealing device and sleeve pipe realize sealing. In the utility model, the auxiliary righting sealing sleeve adopts the combination of the annular righting sleeve 1 and the annular elastic sealing sleeve 2, the annular elastic sealing sleeve 2 is positioned at the position of the limit step and is embedded in the annular righting sleeve 1, on one hand, the annular righting sleeve 1 plays the role of fixing the whole auxiliary sealing sleeve, on the other hand, when the well mouth is rebuilt, the sleeve can be guided and righted in the process that the sleeve reaches the limit step of the sleeve sealing device, and meanwhile, the sleeve is kept to be vertical to the front end of the sleeve sealing device in a sealing manner, which is favorable for realizing the effect of tight sealing of the front end of the sleeve sealing device; the annular elastic sealing sleeve 2 is located at the position of the sleeve limiting step, and is directly contacted with the upper end face of the sleeve in the well mouth reconstruction process, so that the annular centralizing sleeve 1 is in sealing fit with the upper end of the sleeve, the auxiliary sealing effect of the upper end of the sleeve and the sleeve limiting step is realized by the aid of the gravity applied by the sleeve limiting step, and the sealing effect of the sleeve sealing device is safer and more reliable.

In addition, it should be noted that the fixing structure arranged at the upper section of the annular centering sleeve 1 is used for fixing the annular centering sleeve 1 in the cavity of the casing sealing device during preassembling, theoretically, the annular centering sleeve 1 only needs to be fixed in the cavity and can be matched with other components in the casing sealing device without conflict, for example, a hoop structure, a flange structure, a bolt fastening structure and the like are optional, and in the actual situation of wellhead reconstruction, the high-temperature and high-pressure environment in the wellhead reconstruction process, the difficulty of replacement and maintenance, the cost and the like need to be considered; through simulation experiments of the inventor for many times and actual experience of wellhead reconstruction, the bolt fastening structure 3 is a preferable scheme for integrating various factors such as high-temperature and high-pressure environment, difficulty in replacement and maintenance, cost and the like. Specifically, the bolt-up constructs 3 and sets up to 4, and just erects 1 circumference evenly to set up along the annular to guarantee that the stability and the atress of fastening are even.

Preferably, the cross section of the annular centering sleeve 1 along the axial direction is in an inverted L shape, the annular centering sleeve 1 is composed of an upper section and a lower section which are integrally formed, the fixing structure is arranged on the upper section of the annular centering sleeve 1, and the lower section of the annular centering sleeve 1 has a certain height.

It should be noted that the cross section of the annular centralizing sleeve 1 along the axial direction is designed to be in an inverted L shape, so as to match the shape of a limit step required in the casing sealing process, and the annular centralizing sleeve is composed of an upper section and a lower section, wherein the upper section plays a main role in integrally fixing the centralizing auxiliary sealing sleeve in a cavity of the casing sealing device, so that the centralizing auxiliary sealing sleeve is prevented from sliding up and down due to fluid impact in the wellhead reconstruction process, and is further prevented from falling; the secondary function of the upper section is to cooperate with the lower section for a certain casing positioning and centralizing. The leading action that the hypomere played lies in the direction of sleeve pipe to right promptly, the well head of well out of control rebuilds the in-process, the fluid impact force is great, cause the well head to rebuild the emergence of the in-process of device transferring slightly to rock easily, the spacing step department of sleeve pipe that causes casing sealing device is difficult to effectively sealed with the upper end of sleeve pipe, the condition of fluid leakage from the gap between the two takes place, the setting of 1 hypomere of cover can be right the sleeve pipe to the annular right, avoid rocking the aforesaid problem of not tight of sealing that causes. Annular elastic seal cover 2 is at well head in-process direct contact sleeve pipe up end of rebuilding, can cooperate the hypomere of annular centering cover 1, carries out effectual sealedly to the sleeve pipe up end, avoids taking place aforementioned leakage problem.

In addition, the lower section of the annular centralizing sleeve 1 has a certain height, so that the position of the sleeve sealing device can be continuously corrected in the sleeve sleeving process when a wellhead is rebuilt, and the upper end of the sleeve is attached to the annular elastic sealing sleeve 2 at the limiting step when the sleeve reaches the sleeve limiting step, so that the sealing effect of the sleeve sealing device is enhanced. In addition, through the righting effect of the annular righting sleeve 1, the front end seal of the sleeve and the sleeve sealing device can be ensured to be vertical, and the sealing effect of the front end seal of the sleeve can be enhanced. In addition, the certain height refers to a centralizing height which can be set according to the actual situation and is not specifically limited herein, wherein the centralizing height is required by the effect that the casing is perpendicular to the front end of the casing sealing device when the casing reaches the casing limiting step in the wellhead reconstruction process by comprehensively considering factors such as fluid impact force, casing difficulty and actual sealing requirements.

Preferably, the bolt fastening structure 3 includes a threaded hole and a bolt, the threaded hole is opened on the wall of the upper section of the annular centering sleeve 1, and the bolt is in threaded fit with the threaded hole.

Preferably, the annular elastic sealing sleeve 2 is embedded in the joint of the upper section and the lower section of the annular centering sleeve 1, and the section of the annular elastic sealing sleeve 2 along the axial direction is in an inverted L shape.

It should be noted that the section of the annular elastic sealing sleeve 2 along the axial direction is designed to be inverted L-shaped, on one hand, the upper end surface of the sleeve and the annular elastic sealing sleeve 2 can be tightly attached in the well head reconstruction process, the sealing effect of the upper end of the sleeve and the sleeve sealing device is realized through the applied pressure gravity, and the auxiliary and enhanced sealing effect is achieved; on the other hand, the side gap between the sleeve and the sleeve sealing device can be sealed, so that the fluid is prevented from leaking from the gap; in addition, the fitting degree of the sleeve and the sleeve sealing device can be further enhanced, and the centralizing and guiding effects of the lower section of the annular centralizing sleeve 1 are enhanced.

It should be noted in addition that, annular elastic sealing cover 2 is in order to guarantee to carry out the sleeve pipe spacing and when sealing up for the shape of falling L along axial cross-section design, can carry out effectual laminating with the sleeve pipe, and its and annular are right the shape of contact between the cover 1 as long as can satisfy effectually inlay can, the utility model discloses do not specifically prescribe a limit to this, the actual process that the well head was rebuilt can design according to particular case.

Preferably, the bottom end of the lower section of the annular centralizing sleeve 1 is provided with a chamfer 4 for guiding the casing pipe. The chamfer 4 is arranged, so that the guide and the righting of the sleeve can be facilitated.

Preferably, the annular centering sleeve 1 is provided with a groove 5 for embedding the annular elastic sealing sleeve 2.

In addition, it should be noted that the selection of the material of the annular centralizing sleeve 1 needs to consider the high-temperature and high-pressure environment of the wellhead and the fluid impact condition of the wellhead, so those skilled in the art can select high-strength alloy materials or high polymer materials, such as copper alloy, aluminum alloy, etc.; in order to adapt to the high temperature and high pressure of the wellhead and the environment of fluid impact, the material of the annular elastic sealing sleeve 2 may be nitrile rubber material, fluorinated rubber material, or hydrogenated nitrile rubber material, and the like, which is not specifically limited herein.

To sum up, the utility model discloses a well head is rebuild device's righting auxiliary seal cover is applicable to the optical sleeve well head of oil gas well blowout well out of control and does not have end flange and rebuilds, can effectively guarantee the sealed effect between sleeve pipe sealing device and the sleeve pipe among the well head rebuild device, improves the operating efficiency of rebuilding the well head, reduces the number of times that the personnel of speedily carrying out rescue work are close to the well head operation.

The above is only a preferred embodiment of the present invention, and it should be noted that the above preferred embodiment should not be considered as limiting the present invention, and the protection scope of the present invention should be subject to the scope defined by the claims. It will be apparent to those skilled in the art that various modifications and enhancements can be made without departing from the spirit and scope of the invention, and such modifications and enhancements are intended to be within the scope of the invention.

Claims (6)

1. A righting auxiliary seal cover for well head rebuilding device, its characterized in that: set up (1) including the annular, annular elastic sealing cover (2), the annular is right in set (1) is fixed in sleeve pipe sealing device's cavity, the annular is right and is provided with fixed knot structure on set (1), fixed knot structure is 4 bolt-up structures (3) that circumference evenly set up on set (1) are right to the annular, annular elastic sealing cover (2) inlay in set (1) are right to the annular, annular elastic sealing cover (2) are right auxiliary sealing cover during operation and sleeve pipe upper end contact, in order to realize set (1) and the sealed cooperation of sleeve pipe upper end are right to the annular.

2. A centralizing auxiliary gland for a wellhead reconstruction device as claimed in claim 1, characterised in that: the cross section of the annular centering sleeve (1) along the axial direction is inverted L-shaped, the annular centering sleeve (1) is composed of an upper section and a lower section which are integrally formed, the fixing structure is arranged on the upper section of the annular centering sleeve (1), and the lower section of the annular centering sleeve (1) has a certain height.

3. A centralizing auxiliary gland for a wellhead reconstruction device as claimed in claim 1, characterised in that: the bolt fastening structure (3) comprises a threaded hole and a bolt, the threaded hole is formed in the wall of the upper section of the annular centralizing sleeve (1), and the bolt is in threaded fit with the threaded hole.

4. A centralizing auxiliary gland for a wellhead reconstruction device as claimed in claim 2, characterised in that: the annular elastic sealing sleeve (2) is embedded in the joint of the upper section and the lower section of the annular centering sleeve (1), and the section of the annular elastic sealing sleeve (2) along the axial direction is in an inverted L shape.

5. A centralizing auxiliary gland for a wellhead reconstruction device as claimed in claim 2, characterised in that: the bottom end of the lower section of the annular centralizing sleeve (1) is provided with a chamfer (4) for guiding the sleeve.

6. A centralizing auxiliary gland for a wellhead reconstruction device as claimed in claim 1, characterised in that: the annular centralizing sleeve (1) is provided with a groove (5) for embedding the annular elastic sealing sleeve (2).

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