CN114458217A - Rapid high-pressure wellhead device and using method thereof - Google Patents

Rapid high-pressure wellhead device and using method thereof Download PDF

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Publication number
CN114458217A
CN114458217A CN202111351061.9A CN202111351061A CN114458217A CN 114458217 A CN114458217 A CN 114458217A CN 202111351061 A CN202111351061 A CN 202111351061A CN 114458217 A CN114458217 A CN 114458217A
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CN
China
Prior art keywords
extension sleeve
sealing
wall
ring
outer cylinder
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CN202111351061.9A
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CN114458217B (en
Inventor
李健
刘红安
赵苏文
关清涛
邓玉明
郭新军
王养锋
李新妍
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China National Offshore Oil Corp CNOOC
CNOOC Energy Technology and Services Ltd
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China National Offshore Oil Corp CNOOC
CNOOC Energy Technology and Services Ltd
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Priority to CN202111351061.9A priority Critical patent/CN114458217B/en
Publication of CN114458217A publication Critical patent/CN114458217A/en
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B33/00—Sealing or packing boreholes or wells
    • E21B33/02—Surface sealing or packing
    • E21B33/03—Well heads; Setting-up thereof
    • E21B33/04—Casing heads; Suspending casings or tubings in well heads
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/10—Geothermal energy

Abstract

The invention provides a quick high-pressure wellhead device and a using method thereof, wherein a body extension sleeve, a milling extension sleeve, a lower body and a reducing sleeve are sequentially arranged at the tail end of a body from top to bottom, the components jointly form a small-size pipe set, an outer cylinder is arranged on the outer side of the lower part of the body, the tail end of the outer cylinder is provided with the outer cylinder extension sleeve, the outer wall of the outer cylinder is sleeved with a guide base plate bearing ring, an outer hoop ring is sleeved on the outer wall of the tail end of the outer cylinder extension sleeve, a righting cover plate is arranged at the tail end of the outer cylinder extension sleeve, the components jointly form a large-size pipe set, a sealing space is formed between the outer wall of the small-size pipe set and the inner wall of the large-size pipe set, a sealing plug is arranged in the sealing space, and cement is filled in the sealing space. The invention is not dependent on the low pressure well head to be directly installed at the well bottom, reduces 1 time of drilling operation, greatly reduces the well building period by more than 30 percent, hangs 5 layers of casing hangers at most, reduces the operation difficulty of high temperature and high pressure well and ultra-deep well, and increases the adaptability of underwater well head.

Description

Rapid high-pressure wellhead device and using method thereof
Technical Field
The invention relates to the technical field of petroleum and natural gas drilling and production equipment, in particular to a quick high-pressure wellhead device and a using method thereof.
Background
At present, a conventional high-pressure wellhead device can be hung with 3-4 layers of casing hangers, is installed in a low-pressure wellhead which is fixed on the seabed in advance, and is locked with the low-pressure wellhead through a special locking device, and has long installation operation period and complex installation and recovery process.
Disclosure of Invention
The invention overcomes the defects in the prior art, and the defects of long installation operation period and complex installation and recovery process of the conventional high-pressure wellhead device exist, and provides a quick high-pressure wellhead device and a using method thereof.
The purpose of the invention is realized by the following technical scheme.
A rapid high-pressure wellhead device comprises a body, an outer cylinder, a guide base plate bearing ring, a body extension sleeve, an outer cylinder extension sleeve, a milling extension sleeve, a lower body, an outer hoop ring, a centralizing cover plate, a reducing sleeve, an upper limiting ring and a lower limiting ring,
the tail end of the body is sequentially provided with the body extension sleeve from top to bottom, the milling extension sleeve, the lower body and the reducing sleeve are sequentially arranged, the milling extension sleeve, the lower body and the reducing sleeve jointly form a small-size tube group, the tail end outer wall of the body forms a body reducing section, the outer tube is arranged on the outer side of the lower portion of the body, the outer tube extension sleeve is arranged at the tail end of the outer tube, the guide base disc bearing ring is sleeved on the outer wall of the outer tube and used for connecting the guide base disc, the outer hoop ring is sleeved on the tail end outer wall of the outer tube extension sleeve, the centralizing cover plate is arranged at the tail end of the outer tube extension sleeve, the outer hoop ring connects the outer tube extension sleeve and the centralizing cover plate to form a whole, and the outer tube extension sleeve, the outer hoop ring and the centralizing cover plate jointly form a large-size tube group, a sealed space is formed between the outer wall of the small-size pipe group and the inner wall of the large-size pipe group, a sealing plug is arranged in the sealed space, cement is filled in a space formed by the sealing plug and the lower portion of the sealed space, the small-size pipe group and the large-size pipe group are pre-tensioned by means of liquid pressure during the cement injection into the sealed space, so that the fatigue resistance of the rapid high-pressure wellhead device is improved, the upper limiting ring is arranged on the upper portion of the inner wall of the outer barrel and used for limiting the relative position of the body on the outer barrel, and the lower limiting ring is arranged on the upper portion of the outer wall of the milling extension sleeve and used for limiting the moving range of the sealing plug.
The body can hang 3 layers of casing hangers, the upper portion of the inner wall of the body is formed with a tool locking groove, the tool locking groove is used for being matched with a service tool locking ring, the middle portion of the inner wall of the body is formed with a body inner sealing surface, the body inner sealing surface is matched with an annular space sealing assembly to form sealing, a casing hanging seat hanging groove is formed in the lower portion of the inner wall of the body and used for hanging a casing hanger, an outer body locking surface is formed in the middle portion of the outer wall of the body and used for being matched and locked with an inner outer cylinder locking surface on an outer cylinder.
The outer barrel is sleeved on the outer wall of the body through hot fitting, the upper limiting ring is mounted in the outer barrel inner limiting groove in the upper portion of the inner wall of the outer barrel to limit, an outer barrel inner locking surface is formed in the upper portion of the inner wall of the outer barrel, and after the outer barrel is cooled, the outer barrel inner locking surface is attached to and locked with the body outer locking surface.
The guide base plate bearing ring is arranged in the middle of the outer wall of the outer barrel in a welding mode, a guide base plate bearing surface is formed on the outer wall of the guide base plate bearing ring and is used for being connected with a guide base plate.
The inner wall of the outer barrel extension sleeve is provided with an inner sealing surface of the outer barrel extension sleeve, the inner sealing surface of the outer barrel extension sleeve is used for sliding and sealing a sealing plug, an outer hoop ring groove of the outer barrel extension sleeve is formed on the lower portion of the outer wall of the outer barrel extension sleeve, and the outer hoop ring groove of the outer barrel extension sleeve is used for installing an outer hoop ring.
And a milling extension sleeve outer limiting groove is formed in the upper part of the outer wall of the milling extension sleeve and used for installing a lower limiting ring, a milling extension sleeve outer sealing surface is formed on the outer wall of the milling extension sleeve below the milling extension sleeve outer limiting groove, and the milling extension sleeve outer sealing surface is used for sliding and sealing the sealing plug.
The lower body can hang 2 layers of casing hangers, the outer wall of the lower body is formed with a lower body external sealing surface, the lower body external sealing surface is sealed with a sealing plug and a sealing ring arranged between a righting cover plate and the lower body, two lower body internal sealing surfaces are sequentially formed on the inner wall of the lower body from top to bottom, the lower body internal sealing surfaces are used for being matched with an annular sealing assembly to realize sealing, lower body annular sealing locking grooves are formed at the tail ends of the lower body internal sealing surfaces respectively, the lower body annular sealing locking grooves are used for being matched with the annular sealing assembly to realize locking, lower body internal bearing eaves are formed at the lower part of the inner wall of the lower body, and the lower body internal bearing eaves are used for hanging the casing hanger.
Righting the upper surface of apron and being provided with the sealing plug dead lever, sealing plug dead lever is used for the temporary fixation sealing plug it rights apron inner seal circle groove to be formed with on the inner wall of apron to right, rights apron inner seal circle groove and be used for the installation sealing washer it rights apron outer hoop annular to be formed with on the outer wall of apron to right, rights apron outer hoop annular and be used for installing outer hoop the lower surface of apron is provided with the cement filling tube that is used for pouring into cement and is used for controlling cement pressure's cement and returns out the control valve right apron's lower surface an organic whole is provided with deep floor.
The sealing plug is of a steel core-rubber structure and can slide on a sealing surface of a milling extension sleeve and the outer wall of the lower body, before cement is filled, the sealing plug is connected with the sealing plug fixing rod through a shearing pin, during the cement filling, cement slurry is filled through the cement filling pipe and is suppressed to a certain pressure, the shearing pin for connecting the sealing plug and the sealing plug fixing rod is sheared, the sealing plug is separated from the sealing plug fixing rod, the cement slurry is continuously filled through the cement filling pipe until the sealing plug is contacted with the lower limiting ring, the cement slurry is continuously filled to a certain pressure, the cement filling pipe is closed, the cement is solidified under the pressure, a small-size pipe group and a large-size pipe group of the rapid high-pressure wellhead device are pre-tensioned, and the fatigue resistance of the rapid high-pressure wellhead device is improved.
A rubber mat is arranged between the righting cover plate and the cement, a sealing ring is arranged between the righting cover plate and the lower body, and the rubber mat and the sealing ring are used for constructing a sealing space.
A using method of a quick high-pressure wellhead device comprises the following steps:
land assembly:
step 1, connecting a body with a body extension sleeve by welding, connecting a milling extension sleeve, a lower body and a reducing sleeve by welding, and connecting an outer cylinder with a guide base plate bearing ring by welding;
step 2, installing a limiting ring on the inner wall of the outer cylinder, heating the outer cylinder, then sleeving the outer cylinder outside the body until the upper limiting ring is contacted with the body, and installing a lower limiting ring on the milling extension sleeve;
step 3, after the outer barrel is cooled, connecting the body extension sleeve with a milling extension sleeve by welding, connecting the outer barrel with the outer barrel extension sleeve by welding, sleeving a centering cover plate, a sealing plug, a rubber gasket and a sealing ring on the outer side of the lower body, and connecting the outer barrel extension sleeve with the centering cover plate by using an outer hoop;
step 4, injecting cement slurry into the sealed space through the cement injection pipe, building pressure to a certain pressure, cutting a shearing pin for connecting the sealing plug and the sealing plug fixing rod, separating the sealing plug from the sealing plug fixing rod, continuously injecting the cement slurry through the cement injection pipe until the sealing plug is contacted with the lower limiting ring, continuously injecting the cement slurry to a certain pressure, closing the cement injection pipe, and solidifying the cement under the condition of pressure;
offshore installation:
step 1, after a high-pressure wellhead device is conveyed to a drill floor, the high-pressure wellhead device is connected with an inner casing string with a required length, a slip is set on a rotary disc surface, a service tool and an inner pipe string penetrate into the high-pressure wellhead device, the service tool is locked with the high-pressure wellhead device by rotating the service tool, a drill rod is connected to the service tool, the service tool and the high-pressure wellhead device are conveyed to the seabed, and well cementation is carried out;
step 2, after well cementation is completed, rotating the service tool to unlock the service tool and the high-pressure wellhead device, pulling out and recovering the service tool, and completing well construction and temporary well abandoning by installing a wellhead protection device by the ROV;
step 3, after the platform is reset, the ROV recovers a wellhead protection device, the ROV is connected with a lower blowout preventer stack and a marine riser, a pressure test tool is used for carrying out pressure test on the high-pressure wellhead device and the blowout preventer stack, drilling is completed according to the operation requirement, a casing hanger service tool is used for installing a casing hanger, an annular sealing assembly and a casing string, an anti-wear bushing with a downward locking function is installed by an anti-wear bushing service tool, and the whole drilling operation is completed;
offshore recovery:
step 1, recovering an anti-wear bushing with a downward locking function by using an anti-wear bushing service tool, and cutting and recovering a casing hanger, an annular sealing assembly and a casing string in a body by using a cutting and recovering tool;
step 2, cutting and milling the extension sleeve, cement and the outer cylinder extension sleeve by using a cutting and recycling tool, and recycling the body, the outer cylinder, the guide base plate bearing ring, the body extension sleeve, the cut-off milling extension sleeve and the cut-off outer cylinder extension sleeve;
land decomposition:
step 1, transporting the recovered body, the outer cylinder, the guide base plate bearing ring, the body extension sleeve, the cut milling extension sleeve and the cut outer cylinder extension sleeve back to the land, separating the outer cylinder extension sleeve from the outer cylinder by using gas cutting, and separating the body extension sleeve from the milling extension sleeve by using gas cutting;
step 2, after the body, the outer cylinder, the guide base plate bearing ring and the body extension sleeve which are connected together are detected, the body, the outer cylinder, the guide base plate bearing ring and the body extension sleeve can be reused without disassembly;
and 3, if disassembly is required, removing the bearing ring of the guide base plate and the body extension sleeve by using gas cutting, cutting the outer cylinder into two semi-cylinders, taking out the body, detecting and repairing, and reusing.
The invention has the beneficial effects that: the invention can be directly installed at the well bottom without depending on a low-pressure well mouth, reduces 1 time of drilling operation, avoids using the low-pressure well mouth and large-size casing pipes of 30 inches/36 inches, saves the casing pipe purchasing cost and greatly reduces the well building period by more than 30 percent;
during the batch well construction, only a high-pressure wellhead device and a 22-inch casing are needed, so that large-size casings and low-pressure wellhead feeding tools are avoided, the utilization rate of a deck is improved, and the pressure of logistics and transportation is reduced;
the invention can hang 5 layers of casing hangers at most, reduce the operation difficulty of high-temperature high-pressure wells and ultra-deep wells and increase the adaptability of underwater well heads;
the minimum inner diameter of the invention is 18.25 inches, which is convenient for the passage of a reamer, a centralizer and a casing;
the annular sealing assembly locking groove is not formed in the body, the annular sealing assembly can be recovered together with the casing hanger, and compared with the method of respectively recovering the annular sealing assembly and the casing hanger, the method reduces the one-trip tripping time;
the casing hanger and the annular sealing assembly in the body are tightly pressed in the body through the rigid locking bushing locked on the tool locking groove, and compared with a mode of locking the casing hanger by the annular sealing assembly, the locking force is larger by using the rigid locking bushing;
during the cutting and recycling period, the milling extension sleeve is made of thin-wall materials easy to cut, and is fixed by cement on the periphery, so that the cutting risk is reduced, and the operation time is improved;
the top connection interface adopts an international universal interface, can be matched with wellhead connectors and wellhead cutting tools of different factories, and has high reliability;
the cement of the invention is solidified under the condition of pressure, so that the small-size pipe group and the large-size pipe group of the rapid high-pressure wellhead device are pre-tensioned, and the anti-fatigue strength of the rapid high-pressure wellhead device is improved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
in the figure: 1 is a body, 2 is an outer cylinder, 3 is a guide base disc bearing ring, 4 is a body extension sleeve, 5 is an outer cylinder extension sleeve, 6 is a milling extension sleeve, 7 is cement, 8 is a lower body, 9 is an outer hoop ring, 10 is a centralizing cover plate, 11 is a reducing sleeve, 12 is an upper limit ring, 13 is a lower limit ring, 14 is a sealing plug, 15 is a rubber gasket, 16 is a sealing ring, 101 is a tool locking groove, 102 is an inner body sealing surface, 103 is an outer body locking surface, 104 is a sleeve hanging and hanging groove, 201 is an inner outer cylinder locking surface, 202 is an inner outer cylinder limiting groove, 301 is a guide base disc bearing surface, 501 is an outer cylinder extension sleeve inner sealing surface, 502 is an outer cylinder extension sleeve outer hoop ring groove, 601 is a milling extension sleeve outer limiting groove, 602 is a milling extension sleeve outer sealing surface, 801 is a lower body outer sealing surface, 802 is a lower body inner body sealing surface, 803 is a lower body annular sealing and locking groove, 804 is a lower body inner bearing eave, 1001 is a sealing plug fixing rod, 1002 is a centralizing cover plate inner sealing ring groove, 1003 is a centralizing cover plate outer hoop groove, 1004 is a cement return control valve, 1005 is a reinforcing rib plate, and 1006 is a cement injection pipe.
For a person skilled in the art, other relevant figures can be obtained from the above figures without inventive effort.
Detailed Description
The technical solution of the present invention is further illustrated by the following specific examples.
Example one
A rapid high-pressure wellhead device comprises a body 1, an outer cylinder 2, a guide base plate bearing ring 3, a body extension sleeve 4, an outer cylinder extension sleeve 5, a milling extension sleeve 6, a lower body 8, an outer hoop ring 9, a centralizing cover plate 10, a reducing sleeve 11, an upper limit ring 12 and a lower limit ring 13,
the tail end of the body 1 is sequentially provided with a body extension sleeve 4, a milling extension sleeve 6, a lower body 8 and a reducing sleeve 11 from top to bottom, the milling extension sleeve 6, the lower body 8 and the reducing sleeve 11 jointly form a small-size tube group, the outer wall of the tail end of the body 1 forms a body reducing section, the outer tube 2 is arranged on the outer side of the lower part of the body 1, the tail end of the outer tube 2 is provided with an outer tube extension sleeve 5, the outer wall of the outer tube 2 is sleeved with a guide base plate bearing ring 3 for connecting a guide base plate, an outer hoop ring 9 is sleeved on the outer wall of the tail end of the outer tube extension sleeve 5, a righting cover plate 10 is arranged at the tail end of the outer tube extension sleeve 5, the outer hoop ring 9 connects the outer tube extension sleeve 5 and the righting cover plate 10 to form a whole, the outer tube extension sleeve 5, the outer hoop ring 9 and the righting cover plate 10 jointly form a large-size tube group, and a tube group sealing space is formed between the outer wall of the small-size tube group and the inner wall of the large-size tube group, a sealing plug 14 is arranged in the sealing space, cement 7 is filled in the space formed by the sealing plug 14 and the lower part of the sealing space, a small-size pipe group and a large-size pipe group are pre-tensioned by means of liquid pressure during the cement injection into the sealing space, so that the fatigue resistance of the rapid high-pressure wellhead device is improved, an upper limiting ring 12 is arranged on the upper part of the inner wall of the outer barrel 2 and used for limiting the relative position of the body 1 on the outer barrel 2, and a lower limiting ring 13 is arranged on the upper part of the outer wall of the milling extension sleeve 5 and used for limiting the moving range of the sealing plug 14.
Example two
On the basis of the first embodiment, the body 1 can hang 3 layers of casing hangers, a tool locking groove 101 is formed in the upper portion of the inner wall of the body 1, the tool locking groove 101 is used for being matched with a service tool locking ring, an inner body sealing surface 102 is formed in the middle of the inner wall of the body 1, the inner body sealing surface 102 is matched with an annular space sealing assembly to form sealing, a casing hanging seat hanging groove 104 is formed in the lower portion of the inner wall of the body 1, the casing hanging seat hanging groove 104 is used for hanging a casing hanger, an outer body locking surface 103 is formed in the middle of the outer wall of the body 1, and the outer body locking surface 103 is used for being matched and locked with an outer cylinder locking surface 201 on the outer cylinder 2.
The outer barrel 2 is sleeved on the outer wall of the body 1 through hot fitting, the limiting is carried out through an upper limiting ring 12 arranged in an outer barrel inner limiting groove 202 on the upper portion of the inner wall of the outer barrel 2, an outer barrel inner locking surface 201 formed on the upper portion of the inner wall of the outer barrel 2 is used for achieving fitting and locking of the outer barrel inner locking surface 201 and the body outer locking surface 103 after the outer barrel 2 is cooled.
The guide base disc bearing ring 3 is arranged in the middle of the outer wall of the outer barrel 2 through welding, a guide base disc bearing surface 301 is formed on the outer wall of the guide base disc bearing ring 3, and the guide base disc bearing surface 301 is used for being connected with a guide base disc.
An outer cylinder extension sleeve inner sealing surface 201 is formed on the inner wall of the outer cylinder extension sleeve 5, an outer cylinder extension sleeve inner sealing surface 501 is used for sliding and sealing the sealing plug 14, an outer cylinder extension sleeve outer hoop ring groove 502 is formed on the lower portion of the outer wall of the outer cylinder extension sleeve 5, and the outer cylinder extension sleeve outer hoop ring groove 502 is used for installing the outer hoop ring 9.
A milling extension sleeve outer limiting groove 601 is formed in the upper portion of the outer wall of the milling extension sleeve 6, the milling extension sleeve outer limiting groove 601 is used for installing a lower limiting ring 13, a milling extension sleeve outer sealing surface 602 is formed on the outer wall of the milling extension sleeve 6 below the milling extension sleeve outer limiting groove 601, and the milling extension sleeve outer sealing surface 602 is used for sliding and sealing a sealing plug 14.
EXAMPLE III
On the basis of the second embodiment, the lower body 8 can hang 2 layers of casing hangers, a lower body outer sealing surface 801 is formed on the outer wall of the lower body 8, the lower body outer sealing surface 801 forms sealing with a sealing plug 14 and a sealing ring 16 installed between the centralizing cover plate 10 and the lower body 8, two lower body inner sealing surfaces 802 are sequentially formed on the inner wall of the lower body 8 from top to bottom, the lower body inner sealing surfaces 802 are used for being matched with an annular space sealing assembly to realize sealing, lower body annular space sealing locking grooves 803 are respectively formed at the tail ends of the lower body inner sealing surfaces 802, the lower body annular space sealing locking grooves 803 are used for being matched with the annular space sealing assembly to realize locking, a lower body inner bearing eave 804 is formed on the lower portion of the inner wall of the lower body 8, and the lower body inner bearing eave 804 is used for hanging the casing hanger.
The upper surface of the centering cover plate 10 is provided with a sealing plug fixing rod 1001, the sealing plug fixing rod 1001 is used for temporarily fixing a sealing plug 14, a centering cover plate inner sealing ring groove 1002 is formed on the inner wall of the centering cover plate 10, the centering cover plate inner sealing ring groove 1002 is used for installing a sealing ring 16, a centering cover plate outer hoop groove 1003 is formed on the outer wall of the centering cover plate 10, the centering cover plate outer hoop groove 1003 is used for installing an outer hoop 9, the lower surface of the centering cover plate 10 is provided with a cement injection pipe 1006 used for injecting cement and a cement return control valve 1004 used for controlling the cement pressure, and a reinforcing rib plate 1005 is integrally arranged on the lower surface of the centering cover plate 10.
The sealing plug 14 is of a steel core-rubber structure, the sealing plug 14 can slide on a sealing surface of the outer wall of the milling extension sleeve 6 and the outer wall of the lower body 8, before cement is filled, the sealing plug 14 is connected with the sealing plug fixing rod 1001 through a shearing pin, during cement injection, cement slurry is injected through the cement injection pipe and is suppressed to a certain pressure, the shearing pin connecting the sealing plug 14 and the sealing plug fixing rod 1001 is sheared, the sealing plug 14 is separated from the sealing plug fixing rod 1001, the cement slurry is continuously injected through the cement injection pipe until the sealing plug 14 is contacted with the lower limiting ring 13, the cement slurry is continuously injected to a certain pressure, the cement injection pipe 1006 is closed, the cement is solidified under the condition of pressure, a small-size pipe group and a large-size pipe group of the rapid high-pressure wellhead device are pre-tensioned, and the fatigue resistance of the rapid high-pressure wellhead device is improved.
A rubber gasket 15 is arranged between the centralizing cover plate 10 and the cement 7, a sealing ring 16 is arranged between the centralizing cover plate 10 and the lower body 8, and the rubber gasket 15 and the sealing ring 16 are used for constructing a sealing space.
Example four
A using method of a quick high-pressure wellhead device comprises the following steps:
land assembly:
step 1, connecting a body 1 with a body extension sleeve 4 by welding, connecting a milling extension sleeve 6, a lower body 8 and a reducing sleeve 11 by welding, and connecting an outer cylinder 2 with a guide base plate bearing ring 3 by welding;
step 2, installing a limiting ring 12 on the inner wall of the outer cylinder 2, heating the outer cylinder 2 and then sleeving the outer side of the body 1 until the upper limiting ring 12 is contacted with the body 1, and installing a lower limiting ring 13 on the milling extension sleeve 6;
step 3, after the outer barrel 2 is cooled, connecting the body extension sleeve 4 with the milling extension sleeve 6 by welding, connecting the outer barrel 2 with the outer barrel extension sleeve 5 by welding, sleeving a centering cover plate 10, a sealing plug 14, a rubber gasket 15 and a sealing ring 16 on the outer side of the lower body 8, and connecting the outer barrel extension sleeve 5 with the centering cover plate 10 by using an outer hoop 9;
step 4, injecting cement slurry into the 1006 sealed space through the cement injection pipe, building pressure to a certain pressure, shearing a shearing pin for connecting the sealing plug 14 and the sealing plug fixing rod 1001, separating the sealing plug 14 from the sealing plug fixing rod 1001, continuously injecting the cement slurry through the cement injection pipe until the sealing plug 14 is contacted with the lower limiting ring 13, continuously injecting the cement slurry to a certain pressure, closing the cement injection pipe 1006, and solidifying the cement under the condition of pressure;
offshore installation:
step 1, after a high-pressure wellhead device is conveyed to a drill floor, the high-pressure wellhead device is connected with an inner casing string with a required length, a slip is set on a rotary disc surface, a service tool and an inner pipe string penetrate into the high-pressure wellhead device, the service tool is locked with the high-pressure wellhead device by rotating the service tool, a drill rod is connected to the service tool, the service tool and the high-pressure wellhead device are conveyed to the seabed, and well cementation is carried out;
step 2, after well cementation is completed, rotating the service tool to unlock the service tool and the high-pressure wellhead device, pulling out and recovering the service tool, and completing well construction and temporary well abandoning by installing a wellhead protection device by the ROV;
step 3, after the platform is reset, the ROV recovers a wellhead protection device, a blowout preventer stack and a marine riser are connected and put in, a pressure test tool is used for carrying out pressure test on the high-pressure wellhead device and the blowout preventer stack, drilling is completed according to operation requirements, a casing hanger service tool is used for installing a casing hanger, an annular sealing assembly and a casing string, and an anti-wear bushing with a downward locking function is installed by an anti-wear bushing service tool to complete the whole drilling operation;
offshore recovery:
step 1, recovering an anti-wear bushing with a downward locking function by using an anti-wear bushing service tool, and cutting and recovering a casing hanger, an annular sealing assembly and a casing string in a body 1 by using a cutting and recovering tool;
step 2, cutting and milling the extension sleeve 6, cement 7 and the outer cylinder extension sleeve 5 by using a cutting and recycling tool, and recycling the body 1, the outer cylinder 2, the guide base plate bearing ring 3, the body extension sleeve 4, the cut-off milling extension sleeve 6 and the cut-off outer cylinder extension sleeve 5;
land decomposition:
step 1, transporting the recovered body 1, the outer cylinder 2, the guide base disc bearing ring 3, the body extension sleeve 4, the cut milling extension sleeve 6 and the cut outer cylinder extension sleeve 5 back to land, separating the outer cylinder extension sleeve 5 from the outer cylinder 2 by using gas cutting, and separating the body extension sleeve 4 from the milling extension sleeve 6 by using gas cutting;
step 2, after the body 1, the outer cylinder 2, the guide base plate bearing ring 3 and the body extension sleeve 4 which are connected together are detected, the detection device can be repeatedly used without disassembly;
and 3, if disassembly is required, removing the guide base plate bearing ring 3 and the body extension sleeve 4 by gas cutting, cutting the outer cylinder 2 into two semi-cylinders, taking out the body 1, detecting and repairing, and then repeatedly using.
Spatially relative terms, such as "upper," "lower," "left," "right," and the like, may be used in the embodiments for ease of description to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatial terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "lower" can encompass both an upper and a lower orientation. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
Moreover, relational terms such as "first" and "second," and the like, may be used solely to distinguish one element from another element having the same name, without necessarily requiring or implying any actual such relationship or order between such elements.
The present invention has been described in detail, but the above description is only a preferred embodiment of the present invention, and is not to be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.

Claims (9)

1. A swift type high pressure wellhead assembly which characterized in that: comprises a body, an outer cylinder, a guide base plate bearing ring, a body extension sleeve, an outer cylinder extension sleeve, a milling extension sleeve, a lower body, an outer hoop, a centralizing cover plate, a reducing sleeve, an upper limit ring and a lower limit ring,
the tail end of the body is sequentially provided with the body extension sleeve from top to bottom, the milling extension sleeve, the lower body and the reducing sleeve are sequentially arranged, the milling extension sleeve, the lower body and the reducing sleeve jointly form a small-size tube group, the tail end outer wall of the body forms a body reducing section, the outer tube is arranged on the outer side of the lower portion of the body, the outer tube extension sleeve is arranged at the tail end of the outer tube, the guide base disc bearing ring is sleeved on the outer wall of the outer tube and used for connecting the guide base disc, the outer hoop ring is sleeved on the tail end outer wall of the outer tube extension sleeve, the centralizing cover plate is arranged at the tail end of the outer tube extension sleeve, the outer hoop ring connects the outer tube extension sleeve and the centralizing cover plate to form a whole, and the outer tube extension sleeve, the outer hoop ring and the centralizing cover plate jointly form a large-size tube group, a sealed space is formed between the outer wall of the small-size pipe group and the inner wall of the large-size pipe group, a sealing plug is arranged in the sealed space, cement is filled in a space formed by the sealing plug and the lower portion of the sealed space, the small-size pipe group and the large-size pipe group are pre-tensioned by means of liquid pressure during the cement injection into the sealed space, so that the fatigue resistance of the rapid high-pressure wellhead device is improved, the upper limiting ring is arranged on the upper portion of the inner wall of the outer barrel and used for limiting the relative position of the body on the outer barrel, and the lower limiting ring is arranged on the upper portion of the outer wall of the milling extension sleeve and used for limiting the moving range of the sealing plug.
2. A shortcut high pressure wellhead as claimed in claim 1 in which: the body can hang 3 layers of casing hangers, the upper portion of the inner wall of the body is formed with a tool locking groove, the tool locking groove is used for being matched with a service tool locking ring, the middle portion of the inner wall of the body is formed with a body inner sealing surface, the body inner sealing surface is matched with an annular space sealing assembly to form sealing, a casing hanging seat hanging groove is formed in the lower portion of the inner wall of the body and used for hanging a casing hanger, an outer body locking surface is formed in the middle portion of the outer wall of the body and used for being matched and locked with an inner outer cylinder locking surface on an outer cylinder.
3. A shortcut high pressure wellhead as claimed in claim 2 in which: the outer barrel is sleeved on the outer wall of the body through hot fitting, the upper limiting ring is mounted in the outer barrel inner limiting groove in the upper portion of the inner wall of the outer barrel to limit, an outer barrel inner locking surface is formed in the upper portion of the inner wall of the outer barrel, and after the outer barrel is cooled, the outer barrel inner locking surface is attached to and locked with the body outer locking surface.
4. A shortcut high pressure wellhead as claimed in claim 1 in which: the guide base disc bearing ring is arranged in the middle of the outer wall of the outer barrel in a welding mode, a guide base disc bearing surface is formed on the outer wall of the guide base disc bearing ring and is used for being connected with a guide base disc; the inner wall of the outer barrel extension sleeve is provided with an inner sealing surface of the outer barrel extension sleeve, the inner sealing surface of the outer barrel extension sleeve is used for sliding and sealing a sealing plug, an outer hoop ring groove of the outer barrel extension sleeve is formed on the lower portion of the outer wall of the outer barrel extension sleeve, and the outer hoop ring groove of the outer barrel extension sleeve is used for installing an outer hoop ring.
5. A shortcut high pressure wellhead as claimed in claim 1 in which: and a milling extension sleeve outer limiting groove is formed in the upper part of the outer wall of the milling extension sleeve and used for installing a lower limiting ring, a milling extension sleeve outer sealing surface is formed on the outer wall of the milling extension sleeve below the milling extension sleeve outer limiting groove, and the milling extension sleeve outer sealing surface is used for sliding and sealing the sealing plug.
6. A high pressure wellhead assembly according to claim 1 in the form of a shortcut, wherein: the lower body can hang 2 layers of casing hangers, the outer wall of the lower body is formed with a lower body external sealing surface, the lower body external sealing surface is sealed with a sealing plug and a sealing ring arranged between a righting cover plate and the lower body, two lower body internal sealing surfaces are sequentially formed on the inner wall of the lower body from top to bottom, the lower body internal sealing surfaces are used for being matched with an annular sealing assembly to realize sealing, lower body annular sealing locking grooves are formed at the tail ends of the lower body internal sealing surfaces respectively, the lower body annular sealing locking grooves are used for being matched with the annular sealing assembly to realize locking, lower body internal bearing eaves are formed at the lower part of the inner wall of the lower body, and the lower body internal bearing eaves are used for hanging the casing hanger.
7. A shortcut high pressure wellhead as claimed in claim 1 in which: righting the upper surface of apron and being provided with the sealing plug dead lever, sealing plug dead lever is used for the temporary fixation sealing plug it rights apron inner seal circle groove to be formed with on the inner wall of apron to right, rights apron inner seal circle groove and be used for the installation sealing washer it rights apron outer hoop annular to be formed with on the outer wall of apron to right, rights apron outer hoop annular and be used for installing outer hoop the lower surface of apron is provided with the cement filling tube that is used for pouring into cement and is used for controlling cement pressure's cement and returns out the control valve right apron's lower surface an organic whole is provided with deep floor.
8. A shortcut high pressure wellhead as claimed in claim 1 in which: the sealing plug adopts a steel core-rubber structure, can slide on a sealing surface of the milling extension sleeve and the outer wall of the lower body, and is connected with a sealing plug fixing rod through a shearing pin before cement is filled; a rubber mat is arranged between the righting cover plate and the cement, a sealing ring is arranged between the righting cover plate and the lower body, and the rubber mat and the sealing ring are used for constructing a sealing space.
9. A method of using a high pressure wellhead assembly as claimed in any one of claims 1 to 8 in the form of a quick connect wellhead assembly including: the method comprises the following steps:
land assembly:
step 1, connecting a body with a body extension sleeve by welding, connecting a milling extension sleeve, a lower body and a reducing sleeve by welding, and connecting an outer cylinder with a bearing ring of a guide base plate by welding;
step 2, installing a limiting ring on the inner wall of the outer cylinder, heating the outer cylinder, then sleeving the outer cylinder outside the body until the upper limiting ring is contacted with the body, and installing a lower limiting ring on the milling extension sleeve;
step 3, after the outer barrel is cooled, connecting the body extension sleeve with a milling extension sleeve by welding, connecting the outer barrel with the outer barrel extension sleeve by welding, sleeving a centering cover plate, a sealing plug, a rubber gasket and a sealing ring on the outer side of the lower body, and connecting the outer barrel extension sleeve with the centering cover plate by using an outer hoop;
step 4, injecting cement slurry into the sealed space through the cement injection pipe, building pressure to a certain pressure, cutting a shearing pin for connecting the sealing plug and the sealing plug fixing rod, separating the sealing plug from the sealing plug fixing rod, continuously injecting the cement slurry through the cement injection pipe until the sealing plug is contacted with the lower limiting ring, continuously injecting the cement slurry to a certain pressure, closing the cement injection pipe, and solidifying the cement under the condition of pressure;
offshore installation:
step 1, after a high-pressure wellhead device is conveyed to a drill floor, the high-pressure wellhead device is connected with an inner casing string with a required length, a slip is set on a rotary disc surface, a service tool and an inner pipe string penetrate into the high-pressure wellhead device, the service tool is locked with the high-pressure wellhead device by rotating the service tool, a drill rod is connected to the service tool, the service tool and the high-pressure wellhead device are conveyed to the seabed, and well cementation is carried out;
step 2, after well cementation is completed, rotating the service tool to unlock the service tool and the high-pressure wellhead device, pulling out and recovering the service tool, and completing well construction and temporary well abandoning by installing a wellhead protection device by the ROV;
step 3, after the platform is reset, the ROV recovers a wellhead protection device, a blowout preventer stack and a marine riser are connected and put in, a pressure test tool is used for carrying out pressure test on the high-pressure wellhead device and the blowout preventer stack, drilling is completed according to operation requirements, a casing hanger service tool is used for installing a casing hanger, an annular sealing assembly and a casing string, and an anti-wear bushing with a downward locking function is installed by an anti-wear bushing service tool to complete the whole drilling operation;
offshore recovery:
step 1, recovering an anti-wear bushing with a downward locking function by using an anti-wear bushing service tool, and cutting and recovering a casing hanger, an annular sealing assembly and a casing string in a body by using a cutting and recovering tool;
step 2, cutting and milling the extension sleeve, cement and the outer cylinder extension sleeve by using a cutting and recycling tool, and recycling the body, the outer cylinder, the guide base plate bearing ring, the body extension sleeve, the cut-off milling extension sleeve and the cut-off outer cylinder extension sleeve;
land decomposition:
step 1, transporting the recovered body, the outer cylinder, the guide base plate bearing ring, the body extension sleeve, the cut milling extension sleeve and the cut outer cylinder extension sleeve back to the land, separating the outer cylinder extension sleeve from the outer cylinder by using gas cutting, and separating the body extension sleeve from the milling extension sleeve by using gas cutting;
step 2, after the body, the outer cylinder, the guide base plate bearing ring and the body extension sleeve which are connected together are detected, the body, the outer cylinder, the guide base plate bearing ring and the body extension sleeve can be reused without disassembly;
and 3, if disassembly is required, removing the bearing ring of the guide base plate and the body extension sleeve by using gas cutting, cutting the outer cylinder into two semi-cylinders, taking out the body, detecting and repairing, and reusing.
CN202111351061.9A 2021-11-16 2021-11-16 Quick high-pressure wellhead device and application method thereof Active CN114458217B (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108386146A (en) * 2018-04-27 2018-08-10 中国石油大学(北京) Deepwater drilling casing head and annular space sealing device tripping in tool and its application method
CN208184692U (en) * 2018-04-27 2018-12-04 中国石油大学(北京) Deepwater drilling casing head and annular space sealing device tripping in tool
CN109252825A (en) * 2018-11-08 2019-01-22 中国海洋石油集团有限公司 A kind of underwater well head pit shaft attachment multifunctional combination tool
CN208981995U (en) * 2018-09-27 2019-06-14 中国船级社 Installation tool for marine drilling casing head and sealing device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108386146A (en) * 2018-04-27 2018-08-10 中国石油大学(北京) Deepwater drilling casing head and annular space sealing device tripping in tool and its application method
CN208184692U (en) * 2018-04-27 2018-12-04 中国石油大学(北京) Deepwater drilling casing head and annular space sealing device tripping in tool
US20200370387A1 (en) * 2018-04-27 2020-11-26 China University Of Petroleum-Beijing Casing hanger and annulus sealing device running tool for deepwater drilling, and method for using the same
CN208981995U (en) * 2018-09-27 2019-06-14 中国船级社 Installation tool for marine drilling casing head and sealing device
CN109252825A (en) * 2018-11-08 2019-01-22 中国海洋石油集团有限公司 A kind of underwater well head pit shaft attachment multifunctional combination tool

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