Patent Application
20240191600
The present disclosure describes systems and methods for cleaning a valve profile in a wellhead, such as a back-pressure valve profile.
A back-pressure valve (BPV) is a type of a check valve, which is installed in a tubing hanger BPV profile to isolate an upper wellhead section of production tubing/casing from pressure below. The BPV is designed to hold pressure from below by isolating well pressure, while allowing for a one-way flow path to pump fluid from above in case a well control issue occurs as part of killing a well with kill fluid. The BPV is typically used during isolation of the well as a barrier and during temporary isolation such as replacement of the “Christmas tree” or master valves.
During exploitation of the well over time, a BPV profile can accumulate with some solids, debris, metal shavings, and scale with mixture of viscous fluid or grease, especially during production, well intervention or wellhead greasing operations period. Should such debris not be cleaned properly, a BPV can be prevented from being set into a BPV profile or generate challenges to retrieving the BPV from BPV position. In some cases, a BPV can end up being stuck at the wellhead.
In an example implementation, a back pressure valve (BPV) profile cleaning tool includes a brush assembly configured to attach to a BPV rod of a BPV lubricator tool and a second magnet configured to attach to an end of the BPV rod. The brush assembly includes a brush that includes a plurality of bristles and at least one first magnet. The brush further includes an outer diameter sized for insertion into a BPV profile of a wellhead The second magnet includes an outer diameter sized to fit through the BPV profile of the wellhead.
In an aspect combinable with the example implementation, the at least one first magnet includes a plurality of first magnets.
In another aspect combinable with any of the previous aspects, the plurality of first magnets include a plurality of ring magnets mounted on the BPV rod or the to the brush assembly.
In another aspect combinable with any of the previous aspects, the at least one first magnet is configured to attract metallic debris detached from the BPV profile by the brush.
In another aspect combinable with any of the previous aspects, the plurality of bristles are metallic bristles.
In another aspect combinable with any of the previous aspects, the second magnet is configured to attract at least some of the metallic debris detached from the BPV profile by the brush or bristle pieces broken off from at least one of the plurality of metallic bristles.
In another aspect combinable with any of the previous aspects, the second magnet is configured to threadingly attach to the end of the BPV rod.
In another aspect combinable with any of the previous aspects, the outer diameter of the second magnet is less than an outer diameter of a BPV configured to couple to the BPV profile.
In another aspect combinable with any of the previous aspects, the brush assembly and the second magnet are configured to couple to the BPV rod with one or more threaded connections.
In another example implementation, a method for cleaning a BPV profile of a wellhead includes running a BPV lubricator tool into a wellhead. The BPV lubricator tool includes a brush assembly attached to a BPV rod of the BPV lubricator tool and including: a brush that includes a plurality of bristles and an outer diameter sized for insertion into a BPV profile of the wellhead, and at least one first magnet; and a second magnet attached to the end of the BPV rod. The method further includes adjusting a length of the BPV rod to land the brush assembly into a BPV profile of the wellhead; operating the BPV rod to move the brush assembly within the BPV profile such that the plurality of bristles repeatedly contact a surface of the BPV profile; and during the contact, removing one or more debris from the surface of the BPV profile with the plurality bristles.
An aspect combinable with the example implementation further includes magnetically attracting the one or more debris to the at least one magnet of the second magnet.
In another aspect combinable with any of the previous aspects, the plurality of bristles are metallic, the method further including magnetically attracting pieces of the metallic bristles broken off during the contact with the BPV profile to the second magnet.
In another aspect combinable with any of the previous aspects, operating the BPV rod to move the brush assembly includes at least one of operating the BPV rod to rotate the brush assembly within the BPV profile such that the plurality of bristles repeatedly contact the surface of the BPV profile; or operating the BPV rod to reciprocate the brush assembly within the BPV profile such that the plurality of bristles repeatedly contact the surface of the BPV profile.
Another aspect combinable with any of the previous aspects further includes, subsequent to removing the one or more debris from the surface of the BPV profile with the plurality bristles: running the BPV lubricator tool out of the wellhead; replacing the brush assembly and the second magnet attached to the end of the BPV rod with a BPV; running the BPV lubricator tool back into the wellhead; and installing the BPV into the BPV profile with the BPV lubricator tool.
In another aspect combinable with any of the previous aspects, replacing the brush assembly and the second magnet attached to the end of the BPV rod with the BPV includes unthreading the brush assembly and the second magnet from the end of the BPV rod; and threading the BPV onto the end of the BPV rod.
Another aspect combinable with any of the previous aspects further includes, subsequent to installing the BPV into the BPV profile with the BPV lubricator tool, removing the BPV lubricator tool from the wellhead.
In another example implementation, a downhole tool assembly includes a back pressure valve (BPV) lubricator tool that includes a BPV rod; and a BPV profile cleaning tool. The BPV profile cleaning tool includes a brush assembly attached to the BPV rod that includes a brush that includes a plurality of bristles and an outer diameter sized for insertion into a BPV profile of a wellhead, and at least one first magnet. The BPV profile cleaning tool includes a second magnet configured to attach to an end of the BPV rod, the second magnet including an outer diameter sized to fit through the BPV profile of the wellhead.
In an aspect combinable with the example implementation, the at least one first magnet includes a plurality of first magnets.
In another aspect combinable with any of the previous aspects, the plurality of first magnets include a plurality of ring magnets mounted on the BPV rod or the to the brush assembly.
In another aspect combinable with any of the previous aspects, the at least one first magnet is configured to attract metallic debris detached from the BPV profile by the brush.
In another aspect combinable with any of the previous aspects, the plurality of bristles are metallic bristles.
In another aspect combinable with any of the previous aspects, the second magnet is configured to attract at least some of the metallic debris detached from the BPV profile by the brush or bristle pieces broken off from at least one of the plurality of metallic bristles.
In another aspect combinable with any of the previous aspects, the brush assembly and the second magnet are configured to threadingly attach to the end of the BPV rod.
In another aspect combinable with any of the previous aspects, the outer diameter of the second magnet is less than an outer diameter of a BPV configured to couple to the BPV profile.
Implementations of systems and methods for cleaning a back pressure valve (BPV) profile according to the present disclosure can include one, some, or all of the following features. For example, example implementations of a BPV profile cleaning assembly according to the present disclosure can be integrated or otherwise connected to a conventional BPV lubricator tool for installation into a wellhead. As another example, example implementations of a BPV profile cleaning assembly according to the present disclosure can effectively clean a BPV profile area prior to setting a BPV therein to facilitate a successful BPV installation and isolation of the well and avoid potential stuck operations. Further, example implementations of a BPV profile cleaning assembly according to the present disclosure can operate in a high pressure situation. Further, example implementations of a BPV profile cleaning assembly according to the present disclosure can also provide the following features: eliminate slickline intervention operations to clean a BPV profile; eliminate coil tubing intervention operations to clean a BPV profile; elimination of workover/drilling rig intervention operations to clean a BPV profile; establish a clean and ready to set BPV profile to accommodate isolation barriers at the wellhead; eliminate possible stuck BPV operations inside of a tubing hanger so that wellhead production tree valves can be closed and function properly; and magnetically attract debris with one or more magnets to facilitate removal from the wellhead.
The details of one or more implementations of the subject matter described in this disclosure are set forth in the accompanying drawings and the description below. Other features, aspects, and advantages of the subject matter will become apparent from the description, the drawings, and the claims.
In some aspects, however, the profile in the tubing hanger into which the back pressure valve is installed can accumulate with some solids, debris, metal shavings, scale with mixture of viscous fluid or grease, especially during production, well intervention or wellhead greasing operations period. Accumulated solid, metal shavings, junk and debris across the BPV profile can cause the BPV, itself, to become stuck (and, for instance, irremovable).
As shown in
In some aspects, and as shown in
As shown in this example implementation, the BPV profile cleaning assembly 100 includes a brush assembly 102 that is mounted (for example, threadingly, or otherwise) on a portion of the BPV rod 15. The BPV profile cleaning assembly 100 also includes a magnet 108 (which can, in some aspects, be comprised of multiple magnets 108) that is positioned on or mounted to an end of the BPV rod 15.
Turning briefly to
The example brush assembly 102 also includes one or more magnets 106. In this example, there are three magnets 106; other example implementations can have more or fewer magnets 106. In some aspects, the magnets 106 are ring magnets (for example, as shown) that are mounted to the BPV rod 15, the core 114, or another part of the brush assembly 102. In some aspects, the magnets 106 can be positioned within or between the bristles 104 of the brush 105 (as shown) to magnetically attract any metal debris that are removed from a BPV profile surface by the bristles 104. In some aspects, the magnets 106 can also magnetically attract any pieces of the bristles 104 that break off, such as during a cleaning operation of a BPV profile surface by the bristles 104.
As further shown in
With a focus on the tubing hanger 304 and the BPV profile 306, the BPV profile 306 is formed on the inner surface of the tubing hanger 304 as shown and provides a landing seat for a back pressure valve (such as back pressure valve 200). Once landed (for instance, threaded or otherwise) into the BPV profile 305 in the tubing hanger 304, the back pressure valve can provide a seal in which a pressure in the wellhead is maintained downhole of the back pressure valve. Further, wellbore kill fluids can still be circulated from uphole of the back pressure valve into the wellhead 300.
In an example operation, and with reference to
Once the described cleaning operation is completed (for example, after operation of the BPV lubrication tool 10 for a particular time period), the BPV lubrication tool 10 can be pulled from the wellhead 300 along with the BPV profile cleaning assembly 100. The wellhead production tree valves can be closed and the fluid pressure can be bled into the BPV lubrication tool 10. The BPV lubrication tool 10 can then be uninstalled from the wellhead 300. Once uninstalled, the BPV profile cleaning assembly 100 can be removed from the BPV lubrication tool 10 and a back pressure valve (such as back pressure valve 200) can be installed on the BPV rod 15. The BPV lubrication tool 10 can then be reinstalled into the wellhead 300 so that the back pressure valve 200 can be installed in the BPV profile 306.
While this specification contains many specific implementation details, these should not be construed as limitations on the scope of any inventions or of what may be claimed, but rather as descriptions of features specific to particular implementations of particular inventions. Certain features that are described in this specification in the context of separate implementations can also be implemented in combination in a single implementation. Conversely, various features that are described in the context of a single implementation can also be implemented in multiple implementations separately or in any suitable subcombination. Moreover, although features may be described above as acting in certain combinations and even initially claimed as such, one or more features from a claimed combination can in some cases be excised from the combination, and the claimed combination may be directed to a subcombination or variation of a subcombination.
Similarly, while operations are depicted in the drawings in a particular order, this should not be understood as requiring that such operations be performed in the particular order shown or in sequential order, or that all illustrated operations be performed, to achieve desirable results. In certain circumstances, multitasking and parallel processing may be advantageous. Moreover, the separation of various system components in the implementations described above should not be understood as requiring such separation in all implementations, and it should be understood that the described program components and systems can generally be integrated together in a single software product or packaged into multiple software products.
A number of implementations have been described. Nevertheless, it will be understood that various modifications may be made without departing from the spirit and scope of the disclosure. For example, example operations, methods, or processes described herein may include more steps or fewer steps than those described. Further, the steps in such example operations, methods, or processes may be performed in different successions than that described or illustrated in the figures. Accordingly, other implementations are within the scope of the following claims.
