CN116146136A - Single-cylinder multi-well wellhead device and installation method thereof - Google Patents
Single-cylinder multi-well wellhead device and installation method thereof Download PDFInfo
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- CN116146136A CN116146136A CN202310416065.3A CN202310416065A CN116146136A CN 116146136 A CN116146136 A CN 116146136A CN 202310416065 A CN202310416065 A CN 202310416065A CN 116146136 A CN116146136 A CN 116146136A
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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
- E21B33/035—Well heads; Setting-up thereof specially adapted for underwater installations
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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
- E21B33/043—Casing heads; Suspending casings or tubings in well heads specially adapted for underwater well heads
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- 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 discloses a single-cylinder multi-well wellhead device and a single-cylinder multi-well wellhead device, which belong to the technical field of petroleum and natural gas exploitation equipment and comprise the following contents: s1, seating a lower base assembly on a support sleeve; s2, installing a water-stop sleeve on the bearing step inside the lower base assembly; s3, installing one wellhead device, installing a technical sleeve through a mandrel type sleeve hanger assembly during normal operation, and installing the technical sleeve through a slip hanger assembly when the technical sleeve is lowered and meets resistance; s4, installing the oil pipe through an oil pipe hanger assembly, connecting the oil pipe with a christmas tree assembly, and completing the installation of a wellhead device; and S5, installing the remaining wellhead devices according to the steps S3 and S4 in sequence until all wellhead devices are installed. According to the invention, for the working condition of installing a plurality of wellhead devices in a single shaft, a proper installation mode can be selected according to the actual working condition, so that the installation of the plurality of wellhead devices is facilitated.
Description
Technical Field
The invention relates to the technical field of petroleum and natural gas exploitation equipment, in particular to a single-cylinder multi-well wellhead device and a method for installing the same.
Background
The single-cylinder multi-well wellhead at the present stage has the advantages of complex structure, high technical content, high manufacturing difficulty, more matched tools and few domestic manufacturers. When the known part of single-barrel multi-well wellhead is installed, only a mandrel type installation mode or a slip type installation mode is adopted independently, when the mandrel type installation mode is adopted, the depth of a casing to be put into the well needs to be calculated, bottoming is avoided, and when the slip type installation mode is adopted, the casing needs to be cut, so that the method has advantages and disadvantages.
The application publication number CN 109441390A discloses a 36 cun single-cylinder double wellhead oil extraction device, this scheme is provided with two wells in a pit shaft, install 36 cun slips in the installation cover, fixed mounting has first sleeve pipe on the 36 cun slips, be provided with first slips type hanger between the outer wall of one side second sheathed tube and telescopic inner wall, be provided with first dabber type hanger between the outer wall of another side second sheathed tube and telescopic inner wall, still be provided with second dabber type hanger between oil pipe and the sleeve, from this, this scheme different positions have adopted different slips or the installation of dabber type mode, in essence still have the problem of mode self.
Chinese patent publication No. CN 211008547U discloses a single-barrel triple well wellhead assembly having three wells in a wellbore, a bottom slip type casing hanger embedded in a water-barrier disc and located between the water-barrier disc and the surface casing for hanging and sealing the surface casing, and a slip type casing hanger embedded in a bottom trim casing head and located between the bottom trim casing head and the technical casing for hanging and sealing the technical casing. In the scheme, only a slip type structure is adopted, and a mandrel type structure is not adopted.
In the single-barrel multi-well wellhead structure, independent wellhead devices are required to be installed in each wellhead, but the installation process of each wellhead is not completely consistent, so that the calculation difficulty is improved when a mandrel type installation mode is adopted, and adverse effects of subsequent casing pipe descending can be caused once the situation of lowering resistance occurs.
Disclosure of Invention
The invention aims to provide a single-cylinder multi-well wellhead device mounting method and a single-cylinder multi-well wellhead device, so as to solve the problems in the prior art, when a technical sleeve is mounted, the technical sleeve is mounted through a mandrel type sleeve hanger assembly, when the technical sleeve is lowered and encounters resistance, the technical sleeve is mounted through a slip hanger assembly, and for the working condition of a single shaft for mounting a plurality of wellhead devices, a proper mounting mode can be selected according to the actual working condition, so that the plurality of wellhead devices can be mounted conveniently.
In order to achieve the above object, the present invention provides the following solutions:
the invention provides a single-cylinder multi-well wellhead device installation method, which comprises the following steps:
s1, seating a lower base assembly on a support sleeve;
s2, installing a water-stop sleeve in the bearing step in the lower base assembly;
s3, installing one wellhead device, wherein during normal operation, a technical sleeve is installed through a mandrel type sleeve hanger assembly, and when the technical sleeve is lowered and blocked, a slip hanger assembly is adopted to install the technical sleeve;
s4, installing the oil pipe through an oil pipe hanger assembly, connecting the oil pipe with a christmas tree assembly, and completing the installation of a wellhead device;
and S5, installing the remaining wellhead devices according to the steps S3 and S4 in sequence until all wellhead devices are installed.
Preferably, when installing the single barrel dual wellhead assembly, the first riser is installed to the first lower base assembly interior load carrying step via the first slip hanger assembly.
Preferably, in step S2, a first lower wellhead assembly is lowered, the bottom of the first lower wellhead assembly is sealed by two FS rings and an O-ring, a split compression ring assembly is installed, and a bolt is tightened to compress the first lower wellhead assembly.
Preferably, in step S3, during normal operation, a first upper double-layer wellhead assembly is installed, the bottom of the first upper double-layer wellhead assembly is in threaded connection with a first sleeve, two O-rings at the bottom are sealed, bolts are used for tightening, and a gate valve and a screw flange are arranged on a flank; the second sleeve is arranged on a bearing step at the bottom of the first upper double-layer wellhead assembly through a first mandrel type sleeve hanger assembly, and then a first common sealing device assembly is arranged; when the technical sleeve is lowered and blocked, a second slip hanger assembly is lowered to hold the first sleeve, a second upper double-layer wellhead assembly is installed, two FS rings at the bottom are sealed with O rings, bolts are used for tightening, and a gate valve and a screw flange are arranged on a flank; and lowering a third slip hanger assembly on a bearing step at the bottom of the second upper double-layer wellhead assembly, installing a first emergency sealing device assembly, and installing the second sleeve by using the third slip hanger assembly.
Preferably, when the single-barrel three-wellhead device is installed, the second waterproof casing is installed in the bearing step in the second lower base assembly through the second mandrel type casing hanger assembly and is locked by adopting a side jackscrew; and when the second waterproof sleeve is lowered and blocked, the fourth slip hanger assembly is adopted to hold the second waterproof sleeve, and the second emergency sealing device assembly is utilized to provide sealing.
Preferably, in step S3, during normal operation, the second lower wellhead assembly is placed on the second lower base assembly, the second lower wellhead assembly is tightened by bolts, a ball valve and a pipe plug are arranged on the side surface of the second lower wellhead assembly, the first sleeve is mounted on a bearing step at the lower part of the second lower wellhead assembly through a third mandrel type sleeve hanger assembly, and then the second common sealing device assembly is mounted; and when the first sleeve is lowered and blocked, the fifth slip hanger assembly is adopted to hold the first sleeve, and the third emergency sealing device assembly is utilized to provide sealing.
Preferably, in the normal operation, the third upper double-layer wellhead assembly falls on a bearing step at the upper part of the second lower wellhead assembly and is locked by a locking ring, a gate valve and a flange are arranged on the side surface of the third upper double-layer wellhead assembly, a second sleeve is arranged on the bearing step at the lower part of the third upper double-layer wellhead assembly by a fourth mandrel sleeve hanger assembly, and a third common sealing device assembly is arranged; and when the second sleeve is lowered and blocked, the sixth slip hanger assembly is adopted to hold the second sleeve, and the fourth emergency sealing device assembly is utilized to provide sealing.
The invention also provides a single-cylinder multi-well wellhead device, which comprises a support sleeve, a lower base assembly and a christmas tree assembly, wherein the lower base assembly is located on the support sleeve, the christmas tree assembly is located above the lower base assembly, a water-stop sleeve is installed in the lower base assembly through a bearing step, a plurality of wellhead devices are installed on the lower base assembly, the wellhead devices comprise technical sleeves and oil pipes which are sequentially sleeved in the water-stop sleeve, the technical sleeves are installed through a mandrel sleeve hanger or a slip type sleeve hanger, the oil pipes are installed through an oil pipe hanger assembly, and the oil pipes are connected with the christmas tree assembly.
Preferably, in the single-barrel double-well wellhead device, the support casing is 36 "in specification, the waterproof casing is a first waterproof casing with 24" in specification, the technical casing comprises a first casing with an outer layer and a second casing with an inner layer, the first casing is 9-5/8 "in specification, the second casing is 7" in specification, and the oil pipe is 3-1/2 "in specification.
Preferably, in the single-tube three-well wellhead device, the support casing is 36 "in specification, the waterproof casing is 13-3/8" in specification, the technical casing comprises an outer first casing and an inner second casing, the first casing is 9-5/8 "in specification, the second casing is 7" in specification, and the oil pipe is 3-1/2 "in specification.
Compared with the prior art, the invention has the following technical effects:
(1) When the technical sleeve is installed, the technical sleeve is installed through the mandrel type sleeve hanger assembly, and when the technical sleeve is lowered and blocked, the technical sleeve is installed through the slip hanger assembly, so that the working conditions of a plurality of wellhead devices are installed in a single shaft, a proper installation mode can be selected according to the actual working conditions, and the installation of the plurality of wellhead devices is facilitated;
(2) According to the invention, the lower base assembly is located on the support sleeve, the water-stop sleeve is arranged in the lower base assembly to bear the steps, for a single-barrel double well, the support sleeve and the water-stop sleeve are shared by a plurality of wellhead devices, when the first wellhead is arranged, the support sleeve and the water-stop sleeve are arranged, then the technical sleeve and the oil pipe are continuously arranged, when the second wellhead is arranged, the support sleeve and the water-stop sleeve are not required to be arranged, so that the drilling installation time of the support sleeve and the water-stop sleeve can be saved, and for a single-barrel triple well, the support sleeve is shared by a plurality of wellhead devices, and the drilling installation time of the support sleeve can be saved;
(3) The technical sleeve comprises the first sleeve with the outer layer and the second sleeve with the inner layer, which are equivalent to the technical sleeve with double layers, so that the safety of an oil-gas layer can be better protected, and drilling fluid and slurry are prevented from entering an oil pipe;
(4) The single-barrel double-well wellhead device comprises a first lower base assembly, a first lower wellhead assembly and a first upper double-layer wellhead assembly (or a second upper double-layer wellhead assembly) which are sequentially connected from bottom to top, wherein the first lower wellhead assembly is arranged on the first lower base assembly through a split type compression ring assembly, a modularized installation structure can be formed, and each structure is provided with different suspenders for suspending each sleeve or oil pipe, so that the single-barrel double-well wellhead device is compact in structure and convenient to install and maintain;
(5) The single-barrel three-well wellhead device comprises the second lower base assembly, the second lower wellhead assembly and the third upper double-layer wellhead assembly which are sequentially connected from bottom to top, and can form a modularized installation structure.
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 single-barrel dual well wellhead assembly of the present invention;
FIG. 2 is a top view of FIG. 1;
FIG. 3 is an enlarged schematic view of the middle part of FIG. 1;
FIG. 4 is an enlarged view of the lower portion of FIG. 1;
FIG. 5 is a schematic diagram of a single-barrel triple well wellhead assembly according to the present invention;
FIG. 6 is a top view of FIG. 5;
FIG. 7 is an enlarged view of the middle part of FIG. 5;
FIG. 8 is an enlarged view of the lower portion of FIG. 5;
wherein, 11, the first lower base assembly; 12. a first slip hanger assembly; 13. a first lower wellhead assembly; 14. a split clamp ring assembly; 15. a first upper double-deck wellhead assembly; 16. a first mandrel casing hanger assembly; 17. a first common seal assembly; 18. a first tubing hanger assembly; 19. a first tubing head sub assembly; 110. a first tree assembly; 111. a second slip hanger assembly; 112. a second upper double wellhead assembly; 113. a third slip hanger assembly; 114. a first emergency seal assembly;
21. a second lower base assembly; 22. a second mandrel type casing hanger assembly; 23. a fourth slip hanger assembly; 24. a second emergency seal assembly; 25. a second lower wellhead assembly; 26. a third spool type casing hanger assembly; 27. a second common seal assembly; 28. a fifth slip hanger assembly; 29. a third emergency seal assembly; 210. a third upper double layer wellhead assembly; 211. a fourth mandrel type casing hanger assembly; 212. a third common sealing device assembly; 213. a sixth slip hanger assembly; 214. a fourth emergency seal assembly; 215. a second tubing hanger assembly; 216. a second tubing head sub assembly; 217. a second tree assembly;
10. a support sleeve; 20. a first riser; 30. a first sleeve; 40. a second sleeve; 50. an oil pipe; 60. the second water-stop sleeve;
100. a first wellhead device; 200. a second wellhead.
Detailed Description
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 a single-cylinder multi-well wellhead device mounting method and a single-cylinder multi-well wellhead device, so as to solve the problems in the prior art, when a technical sleeve is mounted, the technical sleeve is mounted through a mandrel type sleeve hanger assembly, when the technical sleeve is lowered and is blocked, the technical sleeve is mounted through a slip hanger assembly, and for the working condition of mounting a plurality of wellhead devices in a single shaft, a proper mounting mode can be selected according to the actual working condition, so that the mounting of the plurality of wellhead devices is facilitated.
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 to 8, the invention provides a method for installing a single-cylinder multi-well wellhead device, which can be a single-cylinder double-well wellhead device or a single-cylinder triple-well wellhead device, and comprises the following steps:
s1, seating a lower base assembly (a first lower base assembly 11 when a single-cylinder double-well wellhead device is adopted and a second lower base assembly 21 when a single-cylinder triple-well wellhead device is adopted) on a support sleeve 10;
s2, installing a water-proof sleeve (a first water-proof sleeve 20 when a single-barrel double-well wellhead device is adopted and a second water-proof sleeve 60 when a single-barrel triple-well wellhead device is adopted) in the first lower base assembly 11 or the second lower base assembly 21 to bear steps;
s3, installing one of the wellhead devices, during normal operation, installing a technical sleeve through a mandrel type sleeve hanger assembly, and installing the technical sleeve through a slip hanger assembly when the technical sleeve is lowered and blocked, wherein for the working condition of installing a plurality of wellhead devices in a single shaft, a proper installation mode can be selected according to the actual working condition, so that the installation of the plurality of wellhead devices is facilitated;
s4, installing the oil pipe 50 through an oil pipe hanger assembly (a first oil pipe hanger assembly 18 when a single-cylinder double-well wellhead device is adopted and a second oil pipe hanger assembly 215 when a single-cylinder triple-well wellhead device is adopted), and connecting the first oil production tree assembly 110 or the second oil production tree assembly 217 to complete the installation of a wellhead device;
s5, installing the remaining wellhead devices according to the steps S3 and S4 in sequence until all wellhead devices are installed, as shown in FIG. 2, including two first wellhead devices 100, as shown in FIG. 6, including three second wellhead devices 200.
As shown in fig. 1-4, when the single-barrel double wellhead device is installed, the first riser 20 is installed in the first lower base assembly 11 through the first slip hanger assembly 12 to carry a step.
Step S2 further includes lowering the first lower wellhead assembly 13, mounting the first lower wellhead assembly 13 on the first lower base assembly 11, sealing the bottom of the first lower wellhead assembly 13 with two FS rings and O-rings, mounting the split compression ring assembly 14, and tightening bolts to compress the first lower wellhead assembly 13.
In step S3, during normal operation, the first upper double wellhead assembly 15 is installed, the bottom of the first upper double wellhead assembly 15 is screwed with the first sleeve 30 (the technical sleeve may include the first sleeve 30 and the second sleeve 40), the bottom two O-rings are sealed, tightened with bolts, and the wings are equipped with gate valves, screw flanges, and the like. The second casing 40 is mounted to the load step at the bottom of the first upper double wellhead assembly 15 via the first mandrel hanger assembly 16 and then sealed by mounting the first conventional seal assembly 17. When the technical sleeve is lowered and blocked, the second slip hanger assembly 111 is lowered to hold the first sleeve 30, the second upper double-layer wellhead assembly 112 is installed, the bottom two FS rings and the O rings are sealed, bolts are used for tightening, and the side wings are provided with gate valves, screw flanges and the like; the third slip hanger assembly 113 is lowered onto the load-bearing step at the bottom of the second upper double wellhead assembly 112, the first emergency seal assembly 114 is installed, and the second casing 40 is installed using the third slip hanger assembly 113.
As shown in fig. 5-8, when the single-barrel three-wellhead device is installed, the second water-stop casing 60 is installed on the inner bearing step of the second lower base assembly 21 through the second mandrel type casing hanger assembly 22, and is locked by adopting a side jackscrew; when the second riser 60 is lowered into the obstruction, the fourth slip hanger assembly 23 is used to hold the second riser 60 and provide a seal using the second emergency seal assembly 24.
Step S3 also comprises, during normal operation, dropping the second lower wellhead assembly 25 on the second lower base assembly 21, tightening by bolts, providing ball valves and pipe plugs on the sides, installing the first sleeve 30 on a bearing step at the lower part of the second lower wellhead assembly 25 by a third mandrel type sleeve hanger assembly 26, and installing a second common sealing device assembly 27; when the first casing 30 is lowered against the obstruction, the fifth slip hanger assembly 28 is used to cradle the first casing 30 and provide a seal using the third emergency seal assembly 29.
In normal operation, the third upper double-layer wellhead assembly 210 falls on the bearing step at the upper part of the second lower wellhead assembly 25 and is locked by a locking ring, a gate valve, a flange and the like are arranged on the side surface of the third upper double-layer wellhead assembly 210, the second sleeve 40 is arranged on the bearing step at the lower part of the third upper double-layer wellhead assembly 210 by a fourth mandrel sleeve hanger assembly 211, and a third common sealing device assembly 212 is arranged; when the second casing 40 is lowered against the obstruction, the sixth slip hanger assembly 213 is used to grip the second casing 40 and provide a seal using the fourth emergency seal device assembly 214.
Referring to fig. 1 to 8, the present invention also provides a single-barrel multi-well wellhead device, referring to the single-barrel double-well wellhead device shown in fig. 1 to 4 and the single-barrel triple-well wellhead device shown in fig. 5 to 8, and the single-barrel multi-well wellhead device related to the single-barrel multi-well wellhead device installation method described above may be applied, including a support sleeve 10, a first lower base assembly 11 (or a second lower base assembly 21) seated on the support sleeve 10, and a first tree assembly 110 (or a second tree assembly 217) located above the first lower base assembly 11 (or the second lower base assembly 21). The first lower base assembly 11 is provided with a first riser 20 through a load step and the second lower base assembly 21 is provided with three second risers 60 through a load step. Two wellhead assemblies are mounted on the first lower base assembly 11 and three wellhead assemblies are mounted on the second lower base assembly 21. Each of the single-well, double-well wellhead assemblies includes a technical casing and tubing 50 that are sequentially nested within a first riser 20, and each of the single-well, triple-well wellhead assemblies includes a technical casing and tubing 50 that are sequentially nested within a second riser 60. The technical casing is installed by a mandrel casing hanger or slip casing hanger, tubing 50 is installed by a first tubing hanger assembly 18 or a second tubing hanger assembly 215, and tubing 50 is connected to first tree assembly 110 by a first tubing head sub assembly 19 or to second tree assembly 217 by a second tubing head sub assembly 216. The single-barrel double-well wellhead device comprises a first lower base assembly 11, a first lower wellhead assembly 13 and a first upper double-layer wellhead assembly 15 (or a second upper double-layer wellhead assembly 112) which are sequentially connected from bottom to top, wherein the first lower wellhead assembly 13 is arranged on the first lower base assembly 11 through a split type compression ring assembly 14, and in addition, the single-barrel triple-well wellhead device comprises a second lower base assembly 21, a second lower wellhead assembly 25 and a third upper double-layer wellhead assembly 210 which are sequentially connected from bottom to top, and the single-barrel double-well wellhead device and the single-barrel triple-well wellhead device can form a modularized installation structure, and each structure is provided with different suspenders for suspending each sleeve or oil pipe 50, so that the single-barrel triple-well wellhead device is compact in structure and convenient to install and maintain.
In a single-barrel double wellhead assembly, the support casing 10 may be 36 "in gauge, the riser casing may be a first riser casing 20 of 24" in gauge, the technical casing comprises an outer first casing 30 and an inner second casing 40, the first casing 30 may be 9-5/8 "in gauge, the second casing 40 may be 7" in gauge, and the tubing 50 may be 3-1/2 "in gauge.
In a single casing three well wellhead assembly, the support casing 10 may be 36 "in gauge, the riser casing may be 13-3/8" in gauge, the technical casing may include an outer first casing 30 and an inner second casing 40, the first casing 30 may be 9-5/8 "in gauge, the second casing 40 may be 7" in gauge, and the tubing 50 may be 3-1/2 "in gauge.
The invention provides a single-barrel double-well wellhead device, which comprises the following embodiments:
the first lower base assembly 11 sits on 36 "support sleeve 10 and mounts 30" X24 "the first slip hanger assembly 12 to a 45 ° step inside the first lower base assembly 11. The first lower wellhead assembly 13, bottom two FS rings and O-rings are lowered 10", split clamp ring assembly 14 is installed and bolts are tightened.
In normal operation, a 10 "first upper double wellhead assembly 15 (threaded at the bottom) is installed, a 9-5/8" first sleeve 30 is connected at the bottom by threads, the bottom two O-rings are sealed, the bolts are used for tightening, and the wings are provided with accessories such as gate valves, screw flanges and the like. The 10 "X7" first mandrel hanger assembly 16 is lowered on the 45 DEG step at the bottom of the first upper double wellhead assembly 15, and the 10 "first conventional seal assembly 17 is installed.
When the sleeve is put down and needs emergency operation when meeting the resistance, the first sleeve 30 is held by the 11-1/2 ' X9-5/8 ' second slip hanger assembly 111, the 10 ' second upper double-layer wellhead assembly 112 (with the FS ring at the bottom) is installed, the two FS rings at the bottom are sealed with the O ring, the bolts are used for tightening, and the wings are provided with accessories such as a gate valve, a screw thread flange and the like. The 10 "X7" third slip hanger assembly 113 is lowered to a 45 degree step at the bottom of the second upper double wellhead assembly 112 and the 10 "X7" first emergency seal assembly 114 is installed.
The 10 "X3-1/2" first tubing hanger assembly 18 is lowered to the upper 45 deg. step of the first upper dual wellhead assembly 15 or the second upper dual wellhead assembly 112, and the first tubing head sub assembly 19 and the first tree assembly 110 are installed.
The invention provides a single-barrel three-well wellhead assembly embodiment as follows:
the second lower base assembly 21 sits on 36 "support sleeve 10, and a 15-1/2" X13-3/8 "second mandrel sleeve hanger assembly 22 is installed inside the second lower base assembly 21 at a 45 DEG step, locked with a side jackscrew.
When the 13-3/8 second riser 60 is lowered to meet the blockage, the 15-1/2 'X13-3/8' fourth slip hanger assembly 23 and the 15-1/2 'X13-3/8' second emergency sealing device assembly 24 are used together to hold the second riser 60 and provide sealing.
The 15-1/2 "X13-3/8" fourth slip hanger assembly 23 is dropped onto the internal step of the second lower base assembly 21, the slip bowl of the fourth slip hanger assembly 23 holds the second riser 60, the outer O-ring and inner FS of the 15-1/2 "X13-3/8" second emergency seal assembly 24 are used to seal the inner diameter of the second lower base assembly 21 and the outer diameter of the second riser 60, and the second emergency seal assembly 24 is dropped over the fourth slip hanger assembly 23.
The 13 ' second lower wellhead assembly 25 is placed on the second lower base assembly 21, the second lower wellhead assembly is tightened by bolts, accessories such as ball valves, pipe plugs and the like are arranged on the side surfaces of the second lower wellhead assembly, the 13 ' X9-5/8 ' third mandrel type casing hanger assembly 26 is arranged on a 45 DEG step at the lower part of the 13 ' second lower wellhead assembly 25, and the 13 ' second common sealing device assembly 27 is arranged.
When the 9-5/8 "first sleeve 30 is lowered against the obstacle, the 13" X9-5/8 "fifth slip hanger assembly 28 and the 13" X9-5/8 "third emergency seal assembly 29 are used cooperatively to hold the first sleeve 30 and provide a seal.
The 10 'third upper double-layer wellhead assembly 210 falls on the 13' upper 45 DEG step of the second lower wellhead assembly 25, and is locked by a locking ring, the third upper double-layer wellhead assembly 210 is provided with accessories such as gate valves, flanges and the like, A9-3/8 "X7" fourth mandrel hanger assembly 211 is mounted to a 45 degree step below the 10 "third upper double wellhead assembly 210, followed by a 9-3/8" third conventional seal assembly 212.
When the 7 "second sleeve 40 is lowered against the obstruction, a 9-3/8" X7 "sixth slip hanger assembly 213 is used in conjunction with a 9-3/8" X7 "fourth emergency seal assembly 214 to hold the second sleeve 40 and provide a seal.
The 10 "X3-1/2" second tubing hanger assembly 215 is dropped on the 45 DEG step at the upper portion of the 10 "third upper double wellhead assembly 210, a second tubing head sub assembly 216 and a second christmas tree assembly 217 are installed, and bolted.
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 (10)
1. A method of installing a single-barrel multi-well wellhead, comprising:
s1, seating a lower base assembly on a support sleeve;
s2, installing a water-stop sleeve in the bearing step in the lower base assembly;
s3, installing one wellhead device, wherein during normal operation, a technical sleeve is installed through a mandrel type sleeve hanger assembly, and when the technical sleeve is lowered and blocked, a slip hanger assembly is adopted to install the technical sleeve;
s4, installing the oil pipe through an oil pipe hanger assembly, connecting the oil pipe with a christmas tree assembly, and completing the installation of a wellhead device;
and S5, installing the remaining wellhead devices according to the steps S3 and S4 in sequence until all wellhead devices are installed.
2. The single-barrel multi-well wellhead installation method of claim 1, wherein: when the single-cylinder double-wellhead device is installed, the first water-stop casing is installed in the bearing step in the first lower base assembly through the first slip hanger assembly.
3. The single-barrel multi-well wellhead installation method of claim 2, wherein: and step S2, a first lower wellhead assembly is lowered, the bottom of the first lower wellhead assembly is sealed through two FS rings and O rings, a split type compression ring assembly is installed, and a bolt is tightened to compress the first lower wellhead assembly.
4. A single-barrel multi-well wellhead installation method as claimed in claim 3, wherein: in the step S3, during normal operation, a first upper double-layer wellhead assembly is installed, the bottom of the first upper double-layer wellhead assembly is connected with a first sleeve in a threaded manner, two O rings at the bottom are sealed, bolts are used for tightening, and a gate valve and a screw flange are arranged on a flank; the second sleeve is arranged on a bearing step at the bottom of the first upper double-layer wellhead assembly through a first mandrel type sleeve hanger assembly, and then a first common sealing device assembly is arranged; when the technical sleeve is lowered and blocked, a second slip hanger assembly is lowered to hold the first sleeve, a second upper double-layer wellhead assembly is installed, two FS rings at the bottom are sealed with O rings, bolts are used for tightening, and a gate valve and a screw flange are arranged on a flank; and lowering a third slip hanger assembly on a bearing step at the bottom of the second upper double-layer wellhead assembly, installing a first emergency sealing device assembly, and installing the second sleeve by using the third slip hanger assembly.
5. The single-barrel multi-well wellhead installation method of claim 1, wherein: when the single-barrel three-well wellhead device is installed, the second water-stop sleeve is installed in the bearing step in the second lower base assembly through the second mandrel sleeve hanger assembly, and is locked by adopting a side jackscrew; and when the second waterproof sleeve is lowered and blocked, the fourth slip hanger assembly is adopted to hold the second waterproof sleeve, and the second emergency sealing device assembly is utilized to provide sealing.
6. The method of installing a single-barrel multi-well wellhead according to claim 5, wherein: step S3, during normal operation, a second lower wellhead assembly is placed on the second lower base assembly, bolts are used for tightening, ball valves and pipe plugs are arranged on the sides of the second lower wellhead assembly, a first sleeve is installed on a bearing step at the lower part of the second lower wellhead assembly through a third mandrel type sleeve hanger assembly, and a second common sealing device assembly is installed; and when the first sleeve is lowered and blocked, the fifth slip hanger assembly is adopted to hold the first sleeve, and the third emergency sealing device assembly is utilized to provide sealing.
7. The single-barrel multi-well wellhead installation method of claim 6, wherein: during normal operation, the third upper double-layer wellhead assembly falls on a bearing step at the upper part of the second lower wellhead assembly and is locked by a locking ring, a gate valve and a flange are arranged on the side surface of the third upper double-layer wellhead assembly, a second sleeve is arranged on the bearing step at the lower part of the third upper double-layer wellhead assembly by a fourth mandrel sleeve hanger assembly, and a third common sealing device assembly is arranged; and when the second sleeve is lowered and blocked, the sixth slip hanger assembly is adopted to hold the second sleeve, and the fourth emergency sealing device assembly is utilized to provide sealing.
8. A single-barrel multi-well wellhead device, characterized in that: including support sleeve, be located lower base assembly on the support sleeve and be located the production tree assembly of lower base assembly top, install the riser sleeve through bearing the step in the lower base assembly, install a plurality of wellhead assemblies on the lower base assembly, wellhead assemblies is including overlapping in proper order establishing technical sleeve and the oil pipe in the riser sleeve, technical sleeve installs through spool formula sleeve hanger or slip type sleeve hanger, oil pipe installs through oil pipe hanger assembly, oil pipe connection the production tree assembly.
9. A single-barrel multi-well wellhead according to claim 8, wherein: in the single-barrel double-well wellhead device, the support sleeve is 36 ' in specification, the waterproof sleeve is a first waterproof sleeve with 24 ' in specification, the technical sleeve comprises a first sleeve with an outer layer and a second sleeve with an inner layer, the first sleeve is 9-5/8 ' in specification, the second sleeve is 7 ' in specification, and the oil pipe is 3-1/2 ' in specification.
10. A single-barrel multi-well wellhead according to claim 8, wherein: in the single-tube three-well wellhead device, the support sleeve adopts a specification of 36", the waterproof sleeve adopts a second waterproof sleeve with a specification of 13-3/8", the technical sleeve comprises a first sleeve with an outer layer and a second sleeve with an inner layer, the first sleeve adopts a specification of 9-5/8", the second sleeve adopts a specification of 7", and the oil pipe adopts a specification of 3-1/2".
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|---|---|
| CN116146136B (en) | 2023-09-08 |
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