CN121897274A - Tieback expansion type tail pipe hanger - Google Patents
Tieback expansion type tail pipe hangerInfo
- Publication number
- CN121897274A CN121897274A CN202411462296.9A CN202411462296A CN121897274A CN 121897274 A CN121897274 A CN 121897274A CN 202411462296 A CN202411462296 A CN 202411462296A CN 121897274 A CN121897274 A CN 121897274A
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- CN
- China
- Prior art keywords
- tube
- pipe
- tailpipe
- expansion
- plug
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Earth Drilling (AREA)
Abstract
The invention discloses a tieback expansion type tail pipe hanger, wherein a first pipe section, a second pipe section, a tieback cylinder and a tail pipe are axially and sequentially butted, a central pipe is arranged in the expansion pipe and the tieback cylinder in a penetrating mode, a tail pipe rubber plug is fixed at the bottom end of the central pipe and is blocked between the bottom end of the central pipe and a position opposite to the tieback cylinder, an expansion taper sleeve is arranged on the central pipe and is in contact with the second pipe section, a bump-pressing seat is arranged at the end part of the tail pipe, which is far away from the tieback cylinder, the tail pipe rubber plug is used for being matched with a drill plug rubber plug thrown into the central pipe to enable working fluid to form a first pressure-blocking state in the central pipe, in the first pressure-blocking state, the tail pipe rubber plug and the drill plug rubber plug are separated from the central pipe, the whole body formed by the tail pipe rubber plug and the bump-pressing seat are matched with the bump-pressing seat to enable the working fluid to form a second pressure-blocking state in the central pipe, and in the second pressure-blocking state in the central pipe, in the second pressure-blocking state, and in the working fluid can enter between the central pipe and the tieback cylinder to drive the expansion taper to move to expand the first pipe section.
Description
Technical Field
The invention relates to the technical field of hanger design, in particular to a tieback expansion type tail pipe hanger.
Background
Tail pipe completion is a common well completion operation mode and is commonly applied to the current oil and gas field production. With the deep development of unconventional oil and gas resources, the volume staged fracturing technology is increasingly widely applied. The tail pipe tieback volume fracturing technology specifically comprises the following steps of suspending the tail pipe for well cementation, putting a drill bit into the tail pipe to clean an upper cement plug and a lower cement plug left in well cementation so as to ensure smoothness in a shaft, then using milling shoes to clean and trim a tieback cylinder, putting tieback plugs, hydraulic anchors, a pipe inserting packer, a tieback pipe string and the like into the tail pipe in sequence, tieback the tieback plugs, performing annular space and pressure test in the shaft, and finally installing a christmas tree. The completion of tieback operation can provide safe and reliable pit shaft for follow-up volume staged fracturing operation, ensures the security and the high efficiency of follow-up oil gas production.
In the tieback operations involved in the related art, liner completion operations typically use slip-type liner hangers. The slip type tail pipe hanger can realize tail pipe hanging, but the slip type tail pipe hanger does not have a packing function, so that the possibility of channeling of external cement stones of the tail pipe under the high pressure action of the volume staged fracturing technology is easily caused, annular space is caused to carry out pressure, the sealing integrity and safety of a shaft are affected, and the on-site fracturing construction is adversely affected.
Disclosure of Invention
The embodiment of the invention discloses a tieback expansion type tail pipe hanger, which aims to solve the problem that a slip type tail pipe hanger cannot finish packing in tieback operation in the related technology.
In order to solve the technical problems, the embodiment of the invention discloses the following technical scheme:
The embodiment of the invention discloses a tieback expansion type tail pipe hanger which is used for tieback a tail pipe in a casing, and comprises a central pipe, an expansion cone, a tail pipe rubber plug, a collision pressing seat, a tail pipe, a tieback cylinder and a drill plug rubber plug,
The expansion pipe comprises a first pipe section, a second pipe section and an annular sealing structure arranged on the peripheral wall of the first pipe section, the diameter of the first pipe section is smaller than that of the second pipe section, and the first pipe section, the second pipe section, the tie-back barrel and the tail pipe are axially and sequentially butted;
The central tube is arranged in the expansion tube and the tieback tube in a penetrating way, and the tail tube rubber plug is fixed at the bottom end of the central tube and is blocked between the bottom end of the central tube and the opposite part of the tieback tube; the expansion taper sleeve is arranged on the central pipe and is contacted with the second pipe section;
The tail pipe rubber plug is used for being matched with the drill plug rubber plug put in from the central pipe in a blocking way so as to enable working fluid to form a first pressure-blocking state in the central pipe;
When the first pressure holding state is achieved, the tail pipe rubber plug is separated from the central pipe, and the whole formed by the tail pipe rubber plug and the drilling plug rubber plug falls to the pressure touching seat and is matched with the pressure touching seat in a plugging manner so that the working fluid forms a second pressure holding state in the central pipe;
When the second pressure is build, the working fluid can enter between the central tube and the tieback tube to drive the expansion cone to move so as to expand the first tube section, and the first tube section is sealed and fixed with the sleeve through the annular sealing structure.
In one embodiment, the expandable liner hanger is a tie-back liner hanger having a plurality of annular seal structures spaced axially from the first tubular segment.
In one embodiment, the expandable liner hanger further comprises a third pipe section, the third pipe section is a conical section, a small end of the third pipe section is connected with the first pipe section, a large end of the third pipe section is connected with the second pipe section, and a conical surface of the expansion cone is matched with a pipe wall shape of the third pipe section.
In one embodiment, the tieback expandable liner hanger further comprises a connecting sleeve connected to the bottom end of the central pipe, and the liner rubber plug is sleeved on the connecting sleeve and connected with the connecting sleeve through a shear screw;
in the first pressure-holding state, the working fluid in the central tube drives the tail tube rubber plug to cut off the shear screw so as to be separated from the central tube,
In the tieback expandable liner hanger according to one embodiment, the connection sleeve is fixed to the bottom end of the base pipe by threaded engagement.
In one embodiment, the tieback expandable liner hanger further comprises a shoe attached to an end of the bump holder facing away from the liner.
In one embodiment, the top end of the base pipe is a threaded connection.
In the tieback expandable liner hanger according to one embodiment, the expansion pipe, the tieback tube and the liner are fixedly connected by threaded engagement in sequence.
In the tieback expandable liner hanger of one embodiment, the inner wall of the tieback sleeve is a smooth inner wall.
In one embodiment, the tieback expandable liner hanger has a hardness that is greater than the hardness of the expanded tubular.
The technical scheme disclosed by the embodiment of the invention has the following technical effects:
The tieback expansion type tail pipe hanger disclosed by the embodiment of the invention can realize tieback of a tail pipe, meanwhile, the expansion pipe is fixedly connected with the sleeve through expansion, and meanwhile, the expansion pipe can also realize sealing fit with the inner wall of the sleeve through the annular sealing structure, so that the packing function can be finally realized, and further, the problems of channeling and the like possibly occurring in cement stones outside the tail pipe under the high pressure action of the volume staged fracturing technology can be avoided.
Drawings
Fig. 1 is a schematic view of a tieback expandable liner hanger according to an embodiment of the present invention.
The components in the figures are labeled as follows:
10-tail pipe,
20-A central tube, 30-an expansion tube, 31-a first tube section, 32-a second tube section, 33-a ring-shaped sealing structure, 34-a third tube section,
40-Expansion cone, 50-tail pipe rubber plug, 60-bump pressing seat, 70-tie-back cylinder, 80-drill plug rubber plug, 90-connecting sleeve, 100-floating shoe and 110-sleeve.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to specific embodiments of the present invention and corresponding drawings. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The technical scheme disclosed by each embodiment of the invention is described in detail below with reference to the accompanying drawings.
Referring to fig. 1, an embodiment of the present invention discloses a tieback expandable liner hanger. The disclosed tieback expandable liner hanger is used to tieback the liner 10 within the casing 110. The embodiment of the invention discloses a tiebable expansion type liner hanger which comprises a central pipe 20, an expansion pipe 30, an expansion cone 40, a liner rubber plug 50, a bump-press seat 60, a liner 10, a tieback cylinder 70 and a drill plug rubber plug 80.
The base pipe 20 is the main frame of the tieback expandable liner hanger. The base pipe 20 is adapted to be connected to a running equipment (e.g., drill pipe) to thereby effect connection between the entire tieback expandable liner hanger and the running equipment. The whole tieback expansion liner hanger can be lowered to a preset position under the drive of the lowering device.
The expansion pipe 30 is a tubular member which is required to be expanded and then tightened on the inner wall of the casing 110, the expansion pipe 30 is connected with the tail pipe 10, the expansion pipe 30 is finally fixedly connected with the casing 110 after being tightened, and meanwhile, the connection between the tail pipe 10 and the casing 110 is also realized. In the embodiment of the present invention, the expansion pipe 30 is a stepped pipe, and the expansion pipe 30 includes a first pipe section 31, a second pipe section 32, and an annular sealing structure 33 provided on an outer peripheral wall of the first pipe section 31. The second pipe section 32 is located below the first pipe section 31. The first pipe section 31 has a smaller diameter than the other locations of the expanded pipe 30 (e.g., the second pipe section 32) and is the portion of the expanded pipe 30 that is to be expanded and then expanded against the inner wall of the casing 110.
The first pipe section 31 expands to drive the annular sealing structure 33 arranged on the first pipe section to be tightly expanded on the sleeve 110, the annular sealing structure 33 can be tightly attached to the inner wall of the sleeve 110, and sealing can be realized while tight expansion connection is ensured. The expansion pipe 30 is also sleeved outside the central pipe 20. In the embodiment of the present invention, the first pipe section 31, the second pipe section 32, the tie-back barrel 70 and the tail pipe 10 are axially and sequentially butted, the tie-back barrel 70 can connect the expansion pipe 30 and the tail pipe 10, the tie-back barrel 70 has a sufficient length to ensure that the tail pipe 10 can be tied back, and the tie-back barrel 70 realizes subsequent expansion and tensioning in the casing 110 through the expansion pipe 30, so as to finally realize tie-back of the tail pipe 10.
In the embodiment of the present invention, the center tube 20 is threaded through the expansion tube 30 and the tieback tube 70. The tail pipe rubber plug 50 is fixed on the bottom end of the central pipe 20, and the expansion cone 40 is sleeved on the central pipe 20 and is contacted with the second pipe section 32. It should be noted that, herein, the top end and the bottom end are opposite ends of the related member, wherein the bottom end is lower than the top end, and the bottom end is located below the top end. The tail pipe rubber plug 50 is used for being matched with the drill plug rubber plug 80 to perform plugging, and is also used for being matched with the drill plug rubber plug 80 to form a whole to be matched with the bump-press seat 60 to achieve plugging. The tail pipe rubber plug 50 is fixed on the bottom end of the central pipe 20 and is blocked between the bottom end of the central pipe 20 and the opposite part of the tie-back cylinder 70, and when the tail pipe rubber plug 50 is in a state of being connected with the bottom end of the central pipe 20, the tail pipe rubber plug 50 can block between the bottom end of the central pipe 20 and the opposite part of the tie-back cylinder 70, so that working fluid (such as water) is prevented from entering between the bottom end of the central pipe 20 and the opposite part of the tie-back cylinder 70, and further working fluid is prevented from entering a space where the expansion cone 40 is located.
The expansion cone 40 is sleeved on the central tube 20 and is in contact with the second tube segment 32, so that the expansion cone can slide relative to the central tube 20 and the second tube segment 32 when receiving a larger driving force, and once the working fluid enters a space where the expansion cone 40 is positioned, the expansion cone 40 is driven to ascend so as to forcedly slide between the central tube 20 and the first tube segment 31, and the first tube segment 31 is expanded in the process of ascending along the central tube 20 due to the larger diameter of the expansion cone 40. Of course, the expansion cone 40 is equivalent to being disposed between the central tube 20 and the second tube segment 32, and substantially connects the second tube segment 32 and the central tube 20 without being subjected to a large driving force, thereby connecting the central tube 20 and the expansion tube 30.
It should be noted that, as described above, the central pipe 20 is a central skeleton of the tieback expansion liner hanger, the strength and hardness are high, the strength of the first pipe section 31 is low, the first pipe section 31 can be expanded when the expansion cone 40 slides up the central pipe 20, the annular sealing structure 33 sleeved on the first pipe section 31 can be expanded while the first pipe section 31 is expanded, and then the annular sealing structure 33 is fixed on the inner wall of the casing 110, and meanwhile, the annular sealing structure 33 is sealed between the first pipe section 31 and the casing 110.
The bump-press seat 60 is installed at the end of the tail pipe 10, which is far away from the tieback cylinder 70, and the tail pipe rubber plug 50 is used for being in sealing fit with the drill plug rubber plug 80 thrown into the central pipe 20, so that the working fluid forms a first pressure-holding state in the central pipe 20.
In the first pressure build state, the liner plug 50 is separated from the base pipe 20. Specifically, in the first pressure-holding state, the working fluid is collected so that the pressure of the working fluid is increased, thereby driving the tail pipe rubber plug 50 to be separated from the central pipe 20. The whole formed by the tail pipe rubber plug 50 and the drill plug rubber plug 80 falls to the bump-press seat 60 and is in sealing fit with the bump-press seat 60 so that the working fluid forms a second pressure-holding state in the central pipe 20. The pressure of the working fluid in the second pressure holding state is greater than the pressure of the working fluid in the first pressure holding state.
In the second pressure-holding state, the working fluid enters between the central tube 20 and the tie-back tube 70 to drive the expansion cone 40 to move so as to expand the first tube segment 31, and the first tube segment 31 is sealed and fixed with the sleeve 110 through the annular sealing structure 33.
The working process of the tieback expansion type liner hanger disclosed by the embodiment of the invention is as follows:
The central tube 20 is connected with a lowering device, under the driving of the lowering device, the central tube 20 drives the expansion tube 30, the tie-back tube 70, the tail tube 10 and the bump-press seat 60 to descend through the expansion cone 40, of course, the tail tube rubber plug 50 on the bottom end of the central tube 20 also descends, when the tie-back expansion type tail tube hanger is lowered to a preset position, the drill plug rubber plug 80 is put into, the drill plug rubber plug 80 falls onto the tail tube rubber plug 50 along the tube cavity of the central tube 20, the tail tube rubber plug 50 is plugged, and along with the introduction of working fluid, the working fluid cannot be discharged after entering the central tube 20, so that the working fluid can be gathered to be pressed, and a first pressing state is formed in the central tube 20. When in the first pressure holding state, the pressure of the working fluid is larger to separate the tail pipe rubber plug 50 from the central tube 20, so that the whole formed by the tail pipe rubber plug 50 and the drill plug rubber plug 80 falls to the pressure touching seat 60 and is further in plugging fit with the pressure touching seat 60, and the working fluid forms a second pressure holding state with higher pressure in the central tube 20.
In the second pressure-holding state, since the tail pipe rubber plug 50 is separated from the central pipe 20, a space between the central pipe 20 and the tieback cylinder 70 is opened, and working fluid enters between the central pipe 20 and the tieback cylinder 70 to drive the expansion cone 40 to move so as to expand the first pipe section 31, and the first pipe section 31 is sealed and fixed with the casing 110 through the annular sealing structure 33, so that the expansion pipe 30 and the casing 110 are fixed and sealed finally, and further, the tail pipe 10 is connected with the casing 110 through the tieback cylinder 70 and the expansion pipe 30.
As can be seen from the above working process, the tieback expansion liner hanger disclosed in the embodiment of the present invention can achieve tieback of the liner 10, and meanwhile, the expansion pipe 30 is fixedly connected with the casing 110 through expansion, and meanwhile, can also achieve sealing fit with the inner wall of the casing 110 through the annular sealing structure 33, so as to finally achieve a packing function, thereby avoiding the problems of channeling and the like that may occur in the cement stone outside the liner 10 under the high pressure action of the volumetric staged fracturing technology.
As described above, the expanded tubular 30 is expanded to achieve a seal with the casing 110 by the annular seal 33. The number of the annular seal structures 33 included in the expansion pipe 30 may be one or more, and the embodiment of the present invention is not limited. In one embodiment, the number of annular sealing structures 33 is plural, and the plurality of annular sealing structures 33 may be spaced apart in the axial direction of the first pipe segment 31. This structure can make the expansion pipe 30 after the expansion of the first pipe section 31, the first pipe section 31 can realize the sealing with the casing 110 through the multiple annular sealing structures 33 in the axial direction, and this way of forming multiple sealing can certainly improve the sealing effect.
The expanded pipe 30 disclosed in embodiments of the present invention may include only the first pipe section 31 and the second pipe section 32 mentioned above. The expansion cone 40 is fitted over the central tube 20 in its original position and is in contact with the second tube section 32. During expansion, the expansion cone 40 will travel up the center tube 20, forcibly sliding from the second tube segment 32 into the first tube segment 31, eventually expanding the first tube segment 31. In order to facilitate sliding of the expansion cone 40 into the first tubular segment 31, in a further alternative, the disclosed expansion tube 30 may further comprise a third tubular segment 34. The third pipe section 34 is a conical section, the small end of the third pipe section 34 is connected with the first pipe section 31, the large end of the third pipe section 34 is connected with the second pipe section 32, and the conical surface of the expansion cone 40 is matched with the pipe wall shape of the third pipe section 34. The expansion cone 40 sleeved on the central tube 20 can play a better function of hanging the expansion tube 30 through conical surface matching, meanwhile, the expansion cone 40 can slide into the first tube section 31 through the third tube section 34, and the third tube section 34 is a conical section, so that the expansion cone 40 can slide into the first tube section 31 more easily, and subsequent expansion is facilitated finally.
The tieback expandable liner hanger disclosed in embodiments of the present invention may also include a connection sleeve 90. A connection sleeve 90 may be connected to the bottom end of the center tube 20. Specifically, the connection sleeve 90 may be connected to the bottom end of the center tube 20 by screw-fitting. The tail pipe rubber plug 50 is sleeved on the connecting sleeve 90 and is connected with the connecting sleeve 90 through a shear screw.
In the first pressure-holding state, the working fluid in the central tube 20 drives the tail tube rubber plug 50 to cut off the shear screw so as to be separated from the central tube 20.
The tieback expandable liner hanger of the present invention may also include a floating shoe 100, where the floating shoe 100 is connected to the end of the bump holder 60 facing away from the liner 10, i.e., the floating shoe 100 is connected to the bottom end of the bump holder 60. The shoe 100 is capable of guiding so that the tieback expandable liner hanger can be better lowered.
In an embodiment of the present invention, the expansion pipe 30, the tieback cylinder 70 and the liner 10 may be fixedly connected by threaded engagement in sequence. The threaded fit mode has the advantage of simple structure, and is convenient for the disassembly and assembly of the threaded fit mode and the threaded fit mode. In order to make expansion easier, in the tieback expandable liner hanger disclosed in the embodiments of the present invention, the hardness of the expansion cone 40 may be greater than the hardness of the expansion pipe 30, and the hardness of the expansion cone 40 is greater, so that the expansion pipe 30 is easier to deform, thereby producing an expansion effect.
The embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present invention and the scope of the claims, which are to be protected by the present invention.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202411462296.9A CN121897274A (en) | 2024-10-18 | 2024-10-18 | Tieback expansion type tail pipe hanger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202411462296.9A CN121897274A (en) | 2024-10-18 | 2024-10-18 | Tieback expansion type tail pipe hanger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN121897274A true CN121897274A (en) | 2026-04-21 |
Family
ID=99456932
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202411462296.9A Pending CN121897274A (en) | 2024-10-18 | 2024-10-18 | Tieback expansion type tail pipe hanger |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN121897274A (en) |
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2024
- 2024-10-18 CN CN202411462296.9A patent/CN121897274A/en active Pending
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| SE01 | Entry into force of request for substantive examination |