CN116446811B - Underwater wellhead annular sealing assembly running-in device - Google Patents
Underwater wellhead annular sealing assembly running-in device Download PDFInfo
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- CN116446811B CN116446811B CN202310705754.6A CN202310705754A CN116446811B CN 116446811 B CN116446811 B CN 116446811B CN 202310705754 A CN202310705754 A CN 202310705754A CN 116446811 B CN116446811 B CN 116446811B
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- 238000007789 sealing Methods 0.000 title claims abstract description 160
- 230000005284 excitation Effects 0.000 claims abstract description 139
- 239000000725 suspension Substances 0.000 claims abstract description 52
- 230000009471 action Effects 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 abstract description 7
- 230000008569 process Effects 0.000 abstract description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 4
- 238000005553 drilling Methods 0.000 abstract description 2
- 239000003345 natural gas Substances 0.000 abstract description 2
- 239000003209 petroleum derivative Substances 0.000 abstract description 2
- 238000009434 installation Methods 0.000 description 5
- 238000005265 energy consumption Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B23/00—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B23/00—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
- E21B23/04—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells operated by fluid means, e.g. actuated by explosion
- E21B23/0411—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells operated by fluid means, e.g. actuated by explosion specially adapted for anchoring tools or the like to the borehole wall or to well tube
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The invention relates to the technical field of marine petroleum and natural gas exploration drilling and production, and discloses an underwater wellhead annular sealing assembly lowering device, which comprises a hanging unit and a setting unit, wherein the hanging unit drives the annular sealing assembly to be sent into a wellhead when the annular sealing assembly is lowered; after the annular sealing assembly is lowered into place, the connecting bushing body is connected with the casing hanger through the mandrel body, the driving source drives the excitation assembly to move, the annular sealing assembly is separated from the hanging pin and moves towards the wellhead under the action of the excitation assembly, and the excitation assembly continues to push the annular sealing assembly until the annular sealing assembly is fixed on the wellhead and the casing hanger, and the lowering of the annular sealing assembly is completed. The annular sealing assembly is driven to be lowered by the suspension pin, the integral structure of the device is simple, the operation is convenient, the connecting bushing body is connected with the casing hanger, the problem of well head center alignment in the process of lowering the annular sealing assembly is solved, and the operation convenience is further improved.
Description
Technical Field
The invention relates to the technical field of marine petroleum and natural gas exploration drilling, in particular to an underwater wellhead annular sealing assembly running-in device.
Background
At present, the device for loading the annular sealing assembly of the underwater wellhead is provided by foreign companies, the general structure is complex, the difference exists between the working environment and the using method, the use is time-consuming and labor-consuming, and the operation efficiency is low.
With further deep water petroleum exploration and development, the operation water depth is deeper and deeper, and the requirement on the operation efficiency is higher and higher, so that the installation requirement on petroleum equipment is higher and higher. The complicated device of going into, the skill requirement is very high to the field operation personnel, also can bring a lot of uncertainty factors for the field operation, has just so reduced work efficiency, has increased the working cost.
Therefore, how to change the current situation that the device is put into the annular sealing assembly of the underwater wellhead, which is complex in structure and time-consuming and labor-consuming in operation, becomes a problem to be solved by the person skilled in the art.
Disclosure of Invention
The invention aims to provide an underwater wellhead annular sealing assembly running device, which solves the problems in the prior art, simplifies the device structure of the underwater wellhead annular sealing assembly running device and improves the operation convenience and the operation efficiency.
In order to achieve the above object, the present invention provides the following solutions: the invention provides an underwater wellhead annular sealing assembly running device, which comprises:
the suspension unit comprises a connecting bushing body, a split ring body and a suspension pin, wherein the connecting bushing body can be connected with a casing hanger, the split ring body is rotatably sleeved outside the connecting bushing body, the suspension pin is slidably arranged on the split ring body, and the suspension pin can extend into the annular sealing assembly and is matched with the annular sealing assembly so that the suspension unit can drive the annular sealing assembly to move, and under the action of external force, the suspension pin can be separated from the annular sealing assembly;
the setting unit comprises a mandrel body, an excitation assembly and a driving source, wherein the excitation assembly is connected with the driving source, and the driving source can drive the excitation assembly to slide back and forth relative to the mandrel body so as to push and excite the annular sealing assembly; the connecting bushing body is connected with the mandrel body, and the excitation assembly is located above the connecting bushing body.
Preferably, the suspension pin comprises a sliding section and a working section which are connected, the split ring body is provided with a pin hole, the sliding section can slidably extend into the pin hole, and the working section can extend into the suspension hole of the annular sealing assembly; an elastic piece is further arranged in the pin hole, and in a natural state, the elastic piece ejects the working section out of the pin hole.
Preferably, the working section is of a trapezoid columnar structure, the upper end face of the working section is a plane perpendicular to the axis of the annular sealing assembly, and the upper end face of the working section can prop against the annular sealing assembly; the lower end face of the working section is an inclined face which gradually inclines upwards along the direction away from the axis of the split ring body.
Preferably, the sliding section is of a prismatic structure, the sliding section is provided with a limiting hole, one end of the elastic piece is positioned in the limiting hole, and the other end of the elastic piece is propped against the bottom wall of the pin hole;
the pin hole is provided with a pressing plate, the pressing plate is provided with a through hole allowing the working section to pass through, the pressing plate is detachably connected with the split ring body, and the pressing plate can limit the limit position of the hanging pin.
Preferably, the number of the suspension pins is a plurality of, and the suspension pins are uniformly distributed circumferentially around the axis of the split ring body;
the outer wall of the connecting bushing body is provided with a mounting ring groove matched with the split ring body, the split ring body is rotatably arranged in the mounting ring groove and in clearance fit with the mounting ring groove, and the split ring body is of a split type structure.
Preferably, the connecting bushing body is in threaded connection with the mandrel body, and a set screw is arranged between the connecting bushing body and the mandrel body; the connection liner body is also capable of threaded connection with the casing hanger.
Preferably, the excitation assembly comprises a seal excitation sleeve, a locking ring excitation sleeve and an excitation bushing, wherein the seal excitation sleeve and the locking ring excitation sleeve are sleeved outside the mandrel body, a first shear pin is arranged between the seal excitation sleeve and the mandrel body, and under the action of the driving source, the first shear pin is broken so that the seal excitation sleeve can slide relative to the mandrel body; the locking ring excitation sleeve is connected with the excitation sleeve, a second shear pin is arranged between the excitation sleeve and the sealing excitation sleeve, and the second shear pin is damaged under the action of the driving source, so that the sealing excitation sleeve, the locking ring excitation sleeve and the excitation sleeve can slide relative to the mandrel body.
Preferably, a first pushing ring is arranged at one end of the sealing excitation sleeve, which is close to the setting unit, and a second pushing ring is arranged at one end of the excitation sleeve, which is close to the setting unit, and the first pushing ring and the second pushing ring can be abutted against the annular sealing assembly.
Preferably, the mandrel body is provided with a convex ring, and the sealing excitation sleeve is provided with a stepped hole matched with the convex ring; the axial section of the locking ring excitation sleeve is T-shaped, and one end of the locking ring excitation sleeve with the larger diameter stretches into the first pushing ring.
Preferably, the driving source comprises an external pressure medium source, a first driving channel and a second driving channel, the external pressure medium source is communicated with a space surrounded by the convex ring and the sealing excitation sleeve by using the first driving channel, and the external pressure medium source is communicated with a space surrounded by the sealing excitation sleeve and the locking ring excitation sleeve by using the second driving channel; the first driving channel is arranged on the mandrel body, and the second driving channel is arranged on the sealing excitation sleeve;
sealing elements are arranged between the sealing excitation sleeve and the mandrel body, between the locking ring excitation sleeve and the mandrel body and between the sealing excitation sleeve and the locking ring excitation sleeve.
Compared with the prior art, the invention has the following technical effects:
when the underwater wellhead annular sealing assembly is put into the annular sealing assembly, the suspension pin of the suspension unit stretches into the annular sealing assembly, and the suspension pin is matched with the annular sealing assembly, so that the suspension unit drives the annular sealing assembly to be sent into the wellhead; after the sleeve is put down in place, the connecting bushing body is connected with the sleeve hanger by the mandrel body, and the split ring body and the hanging pin can rotate relative to the connecting bushing body, so that the connecting bushing body and the sleeve hanger are ensured to be connected smoothly; after the lining body and the casing hanger are connected, the setting unit works, the driving source drives the excitation assembly to move, the annular sealing assembly is separated from the hanging pin and moves towards the wellhead direction under the action of the excitation assembly, and the excitation assembly continues to push the annular sealing assembly until the annular sealing assembly is fixed on the wellhead and the casing hanger, so that the annular sealing assembly is put in. According to the underwater wellhead annular sealing assembly feeding device, the annular sealing assembly is driven to be lowered by the hanging pin, then the excitation assembly slides relative to the mandrel body to complete excitation of the annular sealing assembly, the device is simple in integral structure and convenient to operate, and the connecting bushing body is connected with the casing hanger, so that the problem of wellhead center alignment in the annular sealing assembly lowering process is solved, the operation convenience is further improved, and the operation efficiency is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a running device of an annular sealing assembly of an underwater wellhead, according to an embodiment of the present invention;
FIG. 2 is an enlarged schematic view of the structure shown at A in FIG. 1;
FIG. 3 is a schematic view of a suspension pin of an in-service device of an annular seal assembly of an underwater wellhead disclosed in an embodiment of the present invention;
FIG. 4 is a schematic illustration of an embodiment of an apparatus for lowering an annular seal assembly of an underwater wellhead in place;
FIG. 5 is a schematic illustration of completion of connection of a running device of an underwater wellhead annular seal assembly with a casing hanger in accordance with an embodiment of the present invention;
FIG. 6 is a schematic illustration of a subsea wellhead annular seal assembly run-in device internal crimp seal metal seal in accordance with an embodiment of the present invention;
FIG. 7 is a schematic illustration of an embodiment of the present invention wherein an inner and outer locking ring is activated by an underwater wellhead annular seal assembly running device.
Wherein 100 is a hanging unit, and 200 is a setting unit;
1 is a connecting bushing body, 2 is a split ring body, 3 is a hanging pin, 301 is a sliding section, 302 is a working section, 303 is a limiting hole, 4 is a mandrel body, 5 is an elastic piece, 6 is a pressing plate, 7 is a sealing excitation sleeve, 8 is a locking ring excitation sleeve, 9 is an excitation bushing, 10 is a first shearing pin, 11 is a second shearing pin, 12 is a first pushing ring, 13 is a second pushing ring, 14 is a first driving channel, 15 is a second driving channel, 16 is a sealing element, 17 is an annular sealing assembly, and 18 is a sleeve hanger.
Description of the embodiments
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. 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 invention aims to provide an underwater wellhead annular sealing assembly running device, which solves the problems in the prior art, simplifies the device structure of the underwater wellhead annular sealing assembly running device and improves the operation convenience and the operation efficiency.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
Referring to fig. 1-7, the invention provides an underwater wellhead annular sealing assembly running device, which comprises a hanging unit 100 and a setting unit 200, wherein the hanging unit 100 comprises a connecting bushing body 1, a split ring body 2 and a hanging pin 3, the connecting bushing body 1 can be connected with a casing hanger 18, the split ring body 2 is rotatably sleeved outside the connecting bushing body 1, the hanging pin 3 is slidably arranged on the split ring body 2, the hanging pin 3 can extend into an annular sealing assembly 17 and is matched with the annular sealing assembly 17, so that the hanging unit 100 can drive the annular sealing assembly 17 to move, and the hanging pin 3 can be separated from the annular sealing assembly 17 under the action of external force; the setting unit 200 comprises a mandrel body 4, an excitation assembly and a driving source, wherein the excitation assembly is connected with the driving source, and the driving source can drive the excitation assembly to slide back and forth relative to the mandrel body 4 so as to push and excite the annular sealing assembly 17; the connecting bushing body 1 is connected with the mandrel body 4, and the excitation component is positioned above the connecting bushing body 1.
When the underwater wellhead annular sealing assembly is put into the annular sealing assembly 17, the suspension pin 3 of the suspension unit 100 firstly stretches into the annular sealing assembly 17, and the suspension pin 3 is matched with the annular sealing assembly 17, so that the suspension unit 100 drives the annular sealing assembly 17 to be sent into the wellhead; after the sleeve is put down in place, the mandrel body 4 is used for connecting the connecting bushing body 1 with the sleeve hanger 18, the split ring body 2 and the hanging pin 3 can rotate relative to the connecting bushing body 1, smooth connection of the connecting bushing body 1 and the sleeve hanger 18 is ensured, and meanwhile, the connection operation is prevented from affecting the hanging stability of the annular sealing assembly 17; after the liner body 1 and the casing hanger 18 are connected, the setting unit 200 works, the driving source drives the excitation assembly to move, the annular sealing assembly 17 is separated from the hanging pin 3 and moves towards the wellhead under the action of the excitation assembly, and the excitation assembly continues to push the annular sealing assembly 17 until the annular sealing assembly 17 is fixed on the wellhead and the casing hanger 18, and the annular sealing assembly 17 is put in. According to the underwater wellhead annular sealing assembly lowering device, the annular sealing assembly 17 is driven to be lowered by the hanging pin 3, then the exciting assembly slides relative to the mandrel body 4 to finish the excitation of the annular sealing assembly 17, the device is simple in integral structure and convenient to operate, and the connecting bushing body 1 is connected with the casing hanger 18, so that the problem of wellhead center alignment in the process of lowering the annular sealing assembly 17 is solved, the operation convenience is further improved, and the operation efficiency is improved.
Wherein the suspension pin 3 comprises a sliding section 301 and a working section 302 which are connected, the split ring body 2 is provided with a pin hole, the sliding section 301 can slidably extend into the pin hole, and the working section 302 can extend into the suspension hole of the annular sealing assembly 17; an elastic element 5 is also arranged in the pin hole, and in a natural state, the elastic element 5 ejects the working section 302 from the pin hole. The inner wall of the annular seal assembly 17 is provided with a hanging groove matched with the working section 302 of the hanging pin 3, when the hanging unit 100 stretches into the inner ring of the annular seal assembly 17, the annular seal assembly 17 extrudes the hanging pin 3, the hanging pin 3 compresses the elastic piece 5, the hanging pin 3 moves towards the pin hole, when the hanging pin 3 reaches the hanging groove, the working section 302 of the hanging pin 3 stretches out of the pin hole and stretches into the hanging groove under the action force of the elastic piece 5 restoring deformation, and the working section 302 of the hanging pin 3 is matched with the hanging groove, so that the hanging unit 100 can smoothly drive the annular seal assembly 17 to move, and the annular seal assembly 17 is placed down. When the setting unit 200 works, the excitation assembly applies acting force to the suspension pins 3 by using the annular sealing assembly 17, and the suspension pins 3 are sheared, so that the annular sealing assembly 17 can be smoothly lowered. The spring can be selected for the elastic piece 5, the installation is convenient and fast, the price is low, and the elastic piece 5 of a proper type can be selected according to specific working conditions in practical application.
In this embodiment, the working section 302 is in a trapezoid columnar structure, the upper end face of the working section 302 is a plane perpendicular to the axis of the annular sealing assembly 17, and the upper end face of the working section 302 can prop against the annular sealing assembly 17 to support the annular sealing assembly 17, the contact surface of the working section 302 of the suspension pin 3 and the annular sealing assembly 17 is a plane, so that the contact area is increased, and the suspension support stability is improved; the lower end face of the working section 302 is an inclined face which gradually inclines upwards along the direction away from the axis of the split ring body 2, and correspondingly, the inner ring of the annular seal assembly 17 is also provided with a conical surface, when the suspension pin 3 stretches into the annular seal assembly 17, the inclined face of the working section 302 is matched with the conical surface of the annular seal assembly 17, the working section 302 of the suspension pin 3 is pushed to move towards the pin hole, the suspension unit 100 smoothly stretches into the inner ring of the annular seal assembly 17, and suspension fixation of the annular seal assembly 17 is realized.
It should be further noted that, the sliding section 301 has a prismatic structure, and the sliding section 301 is slidably matched with the pin hole, so that the prismatic sliding section 301 can effectively avoid the rotation of the suspension pin 3, and further improve the support stability of the annular sealing assembly 17; the sliding section 301 has a limiting hole 303, one end of the elastic piece 5 is located in the limiting hole 303, the other end of the elastic piece 5 abuts against the bottom wall of the pin hole, and the sliding section 301 plays a role in limiting the elastic piece 5 at the same time, so that dislocation of the elastic piece 5 is avoided.
Specifically, in order to improve the convenience of assembling and disassembling the suspension pin 3 and the elastic member 5, the pin hole is provided with the pressing plate 6, the pressing plate 6 is provided with a through hole allowing the working section 302 to pass through, the pressing plate 6 is connected with the split ring body 2 by using a screw, the pressing plate 6 can limit the limit position of the suspension pin 3, and when the sliding section 301 abuts against the pressing plate 6, the suspension pin 3 moves to the limit position.
In order to improve the stress uniformity of the annular sealing assembly 17, the number of the suspension pins 3 is multiple, the suspension pins 3 are circumferentially and uniformly distributed around the axis of the split ring body 2, in the embodiment, the number of the suspension pins 3 is four, the suspension pins 3 are in surface contact with the annular sealing assembly 17, the abutting surfaces of the four suspension pins 3 and the annular sealing assembly 17 are located in the same radial section plane of the annular sealing assembly 17, and the phenomenon that the suspension pins 3 cannot be sheared simultaneously is avoided.
More specifically, be provided with the installation annular with cut apart ring body 2 looks adaptation on the outer wall of connecting bush body 1, cut apart ring body 2 rotationally set up in the installation annular and two clearance fit, set up the axial position that the bush body 1 can be restricted to the installation annular, avoid connecting bush body 1 to take place the dislocation. For convenient dismouting, cut apart ring body 2 and be split type structure, cut apart ring body 2 and include two semi-rings, and two semi-rings utilize screw connection, and when the dismouting was convenient, structural stability of cut apart ring body 2 had been guaranteed.
It should be emphasized that in this embodiment, the connecting bushing body 1 is in threaded connection with the mandrel body 4, and a set screw is disposed between the two, so that the assembly and the disassembly are convenient, and the set screw is disposed, so that the connection reliability of the two is further improved. Correspondingly, the connecting bushing body 1 can be in threaded connection with the casing hanger 18, the connecting bushing body 1 can be driven to rotate by utilizing the mandrel body 4, so that the connecting bushing body 1 is connected with the casing hanger 18, convenience is brought to the excitation of a subsequent annular space sealing assembly 17, the connecting bushing body 1 is in threaded connection with the casing hanger 18, the split ring body 2 is in threaded connection with the connecting bushing body 1, the hanging stability of the annular space sealing assembly 17 is prevented from being influenced by the connecting operation of the bushing body and the casing hanger 18, and the working reliability of the device is improved. In practical applications, the types of connecting threads between the liner body 1 and the mandrel body 4, and between the liner body 1 and the casing hanger 18 may be selected from the group consisting of STUB ACME threads and other thread types according to specific conditions.
More specifically, the excitation assembly comprises a sealing excitation sleeve 7, a locking ring excitation sleeve 8 and an excitation bushing 9, wherein the sealing excitation sleeve 7 and the locking ring excitation sleeve 8 are sleeved outside the mandrel body 4, a first shear pin 10 is arranged between the sealing excitation sleeve 7 and the mandrel body 4, and the first shear pin 10 is broken under the action of a driving source so that the sealing excitation sleeve 7 can slide relative to the mandrel body 4; the locking ring energizing sleeve 8 is connected with the energizing sleeve 9, a second shear pin 11 is arranged between the energizing sleeve 9 and the sealing energizing sleeve 7, and the second shear pin 11 is destroyed under the action of a driving source so that the sealing energizing sleeve 7, the locking ring energizing sleeve 8 and the energizing sleeve 9 can slide relative to the mandrel body 4.
The end of the seal energizing sleeve 7 near the setting unit 200 has a first push ring 12, the end of the energizing sleeve 9 near the setting unit 200 has a second push ring 13, and both the first push ring 12 and the second push ring 13 can abut against the annular seal assembly 17.
When the connecting bushing body 1 is connected with the casing hanger 18, the driving source is used for driving the sealing excitation sleeve 7, the sealing excitation sleeve 7 drives the locking ring excitation sleeve 8 to move downwards together, so that the hanging pin 3 is sheared off, and the first pushing ring 12 is used for pushing the outer locking ring and the lower body of the annular sealing assembly 17 to move downwards, so that the inner locking ring and the outer locking ring of the annular sealing assembly 17 are pushed into place. Then the locking ring excitation sleeve 8 is driven to move downwards by the driving source, the locking ring excitation sleeve 8 drives the excitation bush 9 to move downwards, the second pushing ring 13 is contacted with the locking ring excitation ring of the annular sealing assembly 17, the locking ring excitation ring is pushed to move downwards, and then the inner locking ring and the outer locking ring are excited, so that the annular sealing assembly 17 is fixed on a wellhead and a casing hanger 18, and the annular sealing assembly 17 is lowered.
It should be noted that, the annular gap capable of accommodating the extension of the locking ring excitation sleeve 8 is further provided between the connecting bushing body 1 and the mandrel body 4, so as to achieve the purpose of limiting the locking ring excitation sleeve 8 and improve the lowering safety factor of the annular sealing assembly 17.
In order to increase the contact area between the mandrel body 4 and the sealing excitation sleeve 7, the mandrel body 4 is provided with a convex ring, and the sealing excitation sleeve 7 is provided with a stepped hole matched with the convex ring; the axial cross section of locking ring excitation sleeve 8 is T shape, and the great one end of diameter of locking ring excitation sleeve 8 stretches into in the first push ring 12, through setting up locking ring excitation sleeve 8 and be T shape, can increase the area of contact of locking ring excitation sleeve 8 and dabber body 4 equally, and then when improving the drive source drive, sealed excitation sleeve 7 and locking ring excitation sleeve 8's area of stress to reduce setting pressure, reduce the energy consumption, improve operating efficiency.
Further, the driving source comprises an external pressure medium source, a first driving channel 14 and a second driving channel 15, wherein the external pressure medium source is communicated with a space surrounded by the convex ring of the mandrel body 4 and the sealing excitation sleeve 7 by utilizing the first driving channel 14, and the external pressure medium source is communicated with a space surrounded by the sealing excitation sleeve 7 and the locking ring excitation sleeve 8 by utilizing the second driving channel 15; the first driving channel 14 is arranged on the mandrel body 4, and the second driving channel 15 is arranged on the sealing excitation sleeve 7; the driving source utilizes the first driving channel 14 to convey pressure medium to the gap between the sealing excitation sleeve 7 and the mandrel body 4, so that the purpose of driving the sealing excitation sleeve 7 to move can be achieved, and likewise, the driving source utilizes the second driving channel 15 to convey pressure medium to the gap between the locking ring excitation sleeve 8 and the sealing excitation sleeve 7, so that the purpose of driving the locking ring excitation sleeve 8 to move is achieved, the stress areas of the sealing excitation sleeve 7 and the locking ring excitation sealing sleeve are increased, the setting pressure of the annular sealing assembly 17 is reduced, and the energy consumption is reduced. It should be explained here that the pressure medium may be liquid or gas, and may be selected according to the actual working conditions, so as to improve flexibility and adaptability of the device.
In order to avoid pressure medium leakage, sealing elements 16 are arranged between the sealing excitation sleeve 7 and the mandrel body 4, between the locking ring excitation sleeve 8 and the mandrel body 4 and between the sealing excitation sleeve 7 and the locking ring excitation sleeve 8, wherein the sealing elements 16 can be O-shaped rings, and the sealing grooves can be dovetail grooves; an O-ring is also fitted over the connection liner body 1 to effect a sealed connection of the connection liner body 1 to the casing hanger 18.
The invention relates to an underwater wellhead annular sealing assembly running device, which specifically comprises the following working processes:
the running-in device hangs up the annular sealing assembly 17 by means of the hanging pin 3 and is fed into the wellhead.
Under the condition of aligning the center, the running-in device and the annular space sealing assembly 17 are slowly lowered, and when the lower end face of the threaded section of the connecting bushing body 1 of the running-in device touches the upper end face of the threaded section of the casing hanger 18, the annular space sealing assembly 17 is lowered into place, as shown in detail in fig. 4.
After the annulus seal assembly 17 is lowered into place, the running device is secured to the casing hanger 18. The mandrel body 4 is rotated, the mandrel body 4 drives the connecting bushing body 1 to rotate, the threads of the connecting bushing body 1 are screwed with the threads of the casing hanger 18, the mandrel body 4 is rotated for a preset number of turns, and the connecting bushing body and the casing hanger 18 are connected in place through the threads, so that the running device and the casing hanger 18 are fixed together, and the details are shown in fig. 5.
After the running-in device is fixed, pressing is carried out from the inside of the running-in device, the pressure enters a space formed by the mandrel body 4 and the sealing excitation sleeve 7, and as the pressure increases, the sealing excitation sleeve 7 drives the locking ring excitation sleeve 8 and the excitation sleeve 9 to move downwards, so that the suspension pin 3 of the suspension annular sealing assembly 17 is sheared; simultaneously, the seal excitation sleeve 7 pushes the outer locking ring and the upper body of the annular space seal assembly 17 to move downwards, so that the annular space seal assembly 17 is excited; at this point the inner and outer locking rings of the annular seal assembly 17 have also been pushed into place awaiting activation, see in detail fig. 6.
After the annular sealing assembly 17 is lowered into place, the annular space between the running device and the wellhead is sealed, at the moment, pressure is pressed from the annular space, the pressure enters a space formed by the sealing excitation sleeve 7 and the locking ring excitation sleeve 8, the sealing excitation sleeve 7 is pushed back to the original position along with the increase of the pressure to be contacted with the mandrel body 4, the locking ring excitation sleeve 8 and the excitation sleeve 9 move downwards together, the excitation sleeve 9 is contacted with the locking ring excitation ring of the annular sealing assembly 17, the locking ring excitation ring is pushed to move downwards, and then the inner locking ring and the outer locking ring are excited, so that the annular sealing assembly 17 is fixed on the wellhead and the casing hanger 18, and the annular sealing assembly 17 is lowered.
The device of the invention has simple structure, convenient use, safety and reliability, and is provided with a hanging unit 100 and a setting unit 200. The suspension unit 100 adopts the suspension pin 3 with a prismatic structure, can be quickly suspended and unhooked, can ensure the stability of the annular sealing assembly 17 suspended on the running device, solves the problem that the annular sealing assembly 17 is difficult to align with the center of a wellhead in the running process, and enables the annular sealing assembly 17 to be conveniently and quickly put in place; the setting unit 200 can fully set the annular sealing assembly 17 with 1700psi pressure, greatly improving the working efficiency and reducing the energy consumption.
The principles and embodiments of the present invention have been described in detail with reference to specific examples, which are provided to facilitate understanding of the method and core ideas of the present invention; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (5)
1. An underwater wellhead annular seal assembly running-in device, comprising:
the suspension unit comprises a connecting bushing body, a split ring body and a suspension pin, wherein the connecting bushing body can be connected with a casing hanger, the split ring body is rotatably sleeved outside the connecting bushing body, the suspension pin is slidably arranged on the split ring body, and the suspension pin can extend into the annular sealing assembly and is matched with the annular sealing assembly so that the suspension unit can drive the annular sealing assembly to move, and under the action of external force, the suspension pin can be separated from the annular sealing assembly;
the setting unit comprises a mandrel body, an excitation assembly and a driving source, wherein the excitation assembly is connected with the driving source, and the driving source can drive the excitation assembly to slide back and forth relative to the mandrel body so as to push and excite the annular sealing assembly; the connecting bushing body is connected with the mandrel body, and the excitation assembly is positioned above the connecting bushing body;
the connecting bushing body is in threaded connection with the mandrel body, and a set screw is arranged between the connecting bushing body and the mandrel body; the connection liner body is further capable of being threadably connected to the casing hanger;
the excitation assembly comprises a sealing excitation sleeve, a locking ring excitation sleeve and an excitation bushing, wherein the sealing excitation sleeve and the locking ring excitation sleeve are sleeved outside the mandrel body, a first shear pin is arranged between the sealing excitation sleeve and the mandrel body, and under the action of the driving source, the first shear pin is broken, so that the sealing excitation sleeve can slide relative to the mandrel body; the locking ring excitation sleeve is connected with the excitation sleeve, a second shear pin is arranged between the excitation sleeve and the sealing excitation sleeve, and the second shear pin is damaged under the action of the driving source so that the sealing excitation sleeve, the locking ring excitation sleeve and the excitation sleeve can slide relative to the mandrel body; the sealing excitation sleeve is provided with a first pushing ring at one end close to the setting unit, the excitation sleeve is provided with a second pushing ring at one end close to the setting unit, and the first pushing ring and the second pushing ring can be propped against the annular sealing assembly; the mandrel body is provided with a convex ring, and the sealing excitation sleeve is provided with a stepped hole matched with the convex ring; the axial section of the locking ring excitation sleeve is T-shaped, and one end of the locking ring excitation sleeve with the larger diameter extends into the first pushing ring; the driving source comprises an external pressure medium source, a first driving channel and a second driving channel, the external pressure medium source is communicated with a space surrounded by the convex ring and the sealing excitation sleeve by utilizing the first driving channel, and the external pressure medium source is communicated with a space surrounded by the sealing excitation sleeve and the locking ring excitation sleeve by utilizing the second driving channel; the first driving channel is arranged on the mandrel body, and the second driving channel is arranged on the sealing excitation sleeve; sealing elements are arranged between the sealing excitation sleeve and the mandrel body, between the locking ring excitation sleeve and the mandrel body and between the sealing excitation sleeve and the locking ring excitation sleeve.
2. The subsea wellhead annular seal assembly running in apparatus of claim 1, wherein: the suspension pin comprises a sliding section and a working section which are connected, the split ring body is provided with a pin hole, the sliding section can slidably extend into the pin hole, and the working section can extend into the suspension hole of the annular sealing assembly; an elastic piece is further arranged in the pin hole, and in a natural state, the elastic piece ejects the working section out of the pin hole.
3. The subsea wellhead annular seal assembly running in apparatus of claim 2, wherein: the working section is of a trapezoid columnar structure, the upper end face of the working section is a plane perpendicular to the axis of the annular sealing assembly, and the upper end face of the working section can prop against the annular sealing assembly; the lower end face of the working section is an inclined face which gradually inclines upwards along the direction away from the axis of the split ring body.
4. The subsea wellhead annular seal assembly running in apparatus of claim 2, wherein: the sliding section is of a prismatic structure, the sliding section is provided with a limiting hole, one end of the elastic piece is positioned in the limiting hole, and the other end of the elastic piece is propped against the bottom wall of the pin hole;
the pin hole is provided with a pressing plate, the pressing plate is provided with a through hole allowing the working section to pass through, the pressing plate is detachably connected with the split ring body, and the pressing plate can limit the limit position of the hanging pin.
5. The subsea wellhead annular seal assembly running in apparatus of claim 2, wherein: the number of the hanging pins is multiple, and the hanging pins are uniformly distributed circumferentially around the axis of the split ring body;
the outer wall of the connecting bushing body is provided with a mounting ring groove matched with the split ring body, the split ring body is rotatably arranged in the mounting ring groove and in clearance fit with the mounting ring groove, and the split ring body is of a split type structure.
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| CN202310705754.6A CN116446811B (en) | 2023-06-15 | 2023-06-15 | Underwater wellhead annular sealing assembly running-in device |
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| CN202108444U (en) * | 2011-06-24 | 2012-01-11 | 中国石油天然气集团公司 | Recycling type hanger for sleeve well drilling |
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| CN116446811A (en) | 2023-07-18 |
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