CN113187425B - Superhigh pressure superhigh temperature high sulfur-resistant HH-level gas production wellhead device - Google Patents
Superhigh pressure superhigh temperature high sulfur-resistant HH-level gas production wellhead device Download PDFInfo
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- CN113187425B CN113187425B CN202110452438.3A CN202110452438A CN113187425B CN 113187425 B CN113187425 B CN 113187425B CN 202110452438 A CN202110452438 A CN 202110452438A CN 113187425 B CN113187425 B CN 113187425B
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- flat valve
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- valve
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Classifications
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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
-
- 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
-
- 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
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/02—Valve arrangements for boreholes or wells in well heads
-
- 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
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
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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
An ultrahigh-pressure ultrahigh-temperature high-sulfur-resistance HH-level gas production wellhead device comprises a gas production tree device and a tubing head device; the gas production tree device comprises an upper flange, four manual flat valves, a hydraulic safety valve and a small four-way valve; the tubing head device comprises a tubing head body, wherein the upper end of the tubing head body is provided with a tubing hanger, and the problems of ultrahigh pressure resistance, high temperature resistance and high sulfur resistance of a well control casing head are successfully overcome through material selection; the metal sealing box is adopted for sealing in a nonmetal sealing element combination mode, and the nonmetal sealing element is made of modified polytetrafluoroethylene, so that the metal sealing box has very good sealing performance at a high temperature of 300 ℃; all the pressure-bearing parts are made of low alloy steel and nickel-based alloy which can bear ultrahigh pressure and resist high temperature and sulfur, and sealing surfaces which are contacted with the medium are all made of hard alloy through overlaying. The ultrahigh pressure ultrahigh temperature high sulfur-resistant HH-level gas production wellhead device has ultrahigh pressure with rated working pressure of 105MPa through hydrostatic pressure experiments.
Description
Technical Field
The invention belongs to the technical field of oil and gas exploitation well control equipment, and particularly relates to an ultrahigh-pressure ultrahigh-temperature high-sulfur-resistance HH
A stage gas production wellhead device.
Background
At present, the requirements on the HSE of oil and gas exploitation are known to be more and more severe, the requirements on the well drilling well control device for oil and gas exploitation are also more and more high, and high-temperature resistant, high-sulfur and high-product oil and gas fields are usually explored in many areas, and due to the technical bottleneck, shelving development is adopted, so that the risk is reduced. Therefore, the alloy has high sulfur content (H) for ultrahigh pressure resistance, high temperature resistance (180 ℃) 2 The demand for well control devices for oil and gas exploitation with S content of 13% to 17%) is increasing, and the existing devices cannot be improved in environments resistant to ultra-high pressure, high temperature and high sulfur.
Disclosure of Invention
In order to solve the problems, the invention aims to provide the ultrahigh pressure ultrahigh temperature high sulfur resistant HH-level gas production wellhead device, which realizes ultrahigh pressure resistance and high resistance by controlling the gas production wellhead device together in terms of material selection and structural design
Mild and sulfur-tolerant requirements.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
the ultra-high pressure ultra-high temperature high sulfur-resistant HH-level gas production wellhead device comprises a gas production tree device and a tubing head device from top to bottom in sequence;
the gas production tree device comprises an upper flange, a first manual flat valve, a hydraulic safety valve and a small four-way valve, wherein the upper end of the upper flange is connected with the first manual flat valve, the upper end of the first manual flat valve is connected with the hydraulic safety valve through a first screw bolt and nut assembly and a first screw bolt and nut assembly, the upper end of the hydraulic safety valve is connected with the small four-way valve through a first screw bolt and nut assembly, the left bypass of the small four-way valve is connected with the second manual flat valve through the first screw bolt and nut assembly, the right bypass of the small four-way valve is connected with the third manual flat valve through the first screw bolt and nut assembly, and the upper end of the small four-way valve is connected with the fourth manual flat valve through the first screw bolt and nut assembly;
the oil pipe head device comprises an oil pipe head body, an oil pipe hanger is arranged at the inner upper end of the oil pipe head body, and a first sealing element, a group of second sealing elements and a third sealing element are arranged between the inner side of the upper flange and the outer side of the upper end of the oil pipe hanger; a group of fourth sealing elements and fifth sealing elements are arranged between the inner side of the tubing head body and the outer side of the lower end of the tubing hanger.
A fifth manual flat valve and a sixth manual flat valve are arranged on the left bypass of the oil pipe head body, and a seventh manual flat valve and an eighth manual flat valve are respectively arranged on the right bypass of the oil pipe head body; the flange at the lower end of the oil pipe head body is connected with the neck flange through a third bolt and nut assembly; and a sixth sealing piece, a seventh sealing piece and an eighth sealing piece are arranged between the tubing head body and the neck flange.
Further, in the above structure, the second manual flat valve comprises a second manual flat valve body, one end of the second manual flat valve body opposite to the small four-way is connected with the first fixed throttle valve through the first threaded flange and the first bolt and nut assembly, and the first fixed throttle valve is also connected with the first square right-angle stop valve through the first threaded flange and the first bolt and nut assembly; the third manual flat valve comprises a third manual flat valve body, one end of the third manual flat valve body, which is opposite to the small four-way joint, is connected with a second fixed throttle valve through a first meter flange, the second fixed throttle valve is also connected with a second square right-angle stop valve through a first thread flange and a first bolt-nut component, and a first square straight-through stop valve and a first double-scale sulfur-proof and shock-proof pressure gauge are arranged above the first meter flange; the fourth manual flat valve comprises a fourth manual flat valve body, and one end, opposite to the small four-way joint, of the fourth manual flat valve body is connected with a second square straight-through stop valve and a second double-scale sulfur-proof and shock-proof pressure gauge through a first threaded flange and a first bolt and nut assembly.
Further, in the above structure, the fifth manual flat valve comprises a fifth manual flat valve body, the sixth manual flat valve comprises a sixth manual flat valve body, one end of the fifth manual flat valve body is connected with the tubing head body through a second screw flange and a fourth bolt and nut assembly, the opposite other end is connected with the sixth manual flat valve body through a second screw flange and a third bolt and nut assembly, and the opposite other end of the sixth manual flat valve body and the fifth manual flat valve body is connected with a third square right-angle stop valve through a second screw flange and a third bolt and nut assembly; the seventh manual flat valve comprises a seventh manual flat valve body, the eighth manual flat valve comprises an eighth manual flat valve body, one end of the seventh manual flat valve is connected with the oil pipe head body through a second screw flange and a fourth bolt nut assembly, the opposite other end is connected with the eighth manual flat valve body through a second instrument flange, and the opposite other end of the eighth manual flat valve body and the seventh manual flat valve body is connected with a fourth square right-angle stop valve through a second screw flange and a third bolt nut assembly; and a third square straight-through stop valve and a third double-scale sulfur-proof and shock-proof pressure gauge are arranged above the second instrument flange.
Further, in the above structure, two pipeline channels are radially opened on the flange at the upper end of the tubing head body, a group of pipeline installation components are respectively installed at the outer ports of the pipeline channels, and the pipeline installation components are a clamping joint or a screwed plug and a perforated press cap and are used for installing and fixing pipelines, so that the pipelines pass through the middle of the pipeline installation components; the flange at the upper end of the oil pipe head body is also provided with a jackscrew channel along the radial direction, the jackscrew channel is arranged at the lower end of the wiring duct, and a jackscrew assembly is arranged in the jackscrew channel.
Further, in the structure, a grease injection pressure test pore canal I is formed in the upper flange along the radial direction, and a first grease injection pressure test component is respectively arranged at the outer port of the grease injection pressure test pore canal I; two grease injection pressure test pore canals II are formed in the flange at the lower end of the oil pipe head body along the radial direction, and a group of second grease injection pressure test assemblies are respectively arranged at the outer ports of the grease injection pressure test pore canals II; two grease injection pressure test pore canals III are formed in the lower end of the neck flange along the radial direction, and a group of third grease injection pressure test assemblies are respectively arranged at the outer ports of the grease injection pressure test pore canals III; a sixth sealing element is connected in the grease injection pressure test pore passage II, and an eighth sealing element is connected in the grease injection pressure test pore passage II; the first grease injection pressure test assembly, the second grease injection pressure test assembly and the third grease injection pressure test assembly all comprise screwed plug connectors and grease injection pressure test valves.
In the above structure, the fourth sealing member is an O-shaped non-metal sealing ring made of modified polytetrafluoroethylene material; the fifth sealing piece consists of a first upper metal sealing ring, a first lower metal sealing ring, a first metal compression ring and a first P-type sealing ring; the seventh sealing element consists of a second upper metal sealing ring, a second lower metal sealing ring, a second metal pressing ring and a second P-type sealing ring; the first sealing piece, the third sealing piece and the eighth sealing piece are octagonal ring metal steel rings; and the sixth sealing piece and the eighth sealing piece are both BT sealing ring structures made of modified polytetrafluoroethylene materials.
Further, in the above structure, the jackscrew assembly comprises a jackscrew body, a jackscrew supporting ring, jackscrew packing, a jackscrew pressing ring and a jackscrew pressing cap; the jackscrew body is sequentially connected with the jackscrew supporting ring, the jackscrew packing and the jackscrew pressing ring, and a jackscrew pressing cap is arranged on the right side of the jackscrew body; the end part of the jackscrew body extends to the inclined plane of the shoulder part of the oil pipe hanger, and the jackscrew body is connected with the oil pipe hanger in a conical surface fit manner.
Further, in the above structure, the first bolt-nut assembly includes a stud bolt, a nut, and a seal grommet; the second bolt and nut assembly comprises a wire planting bolt, a nut and a sealing backing ring; the third bolt and nut assembly comprises a stud bolt, a nut and a sealing gasket ring; the fourth bolt and nut assembly comprises a wire planting bolt, a nut and a sealing gasket ring.
Further, the pressure-bearing piece of the ultrahigh-pressure ultrahigh-temperature high-sulfur-resistance HH-level gas production wellhead device is prepared from low alloy steel 4130 capable of bearing ultrahigh pressure and resisting high temperature and sulfur and nickel-based alloy 725, sealing surfaces in contact with a medium are all formed by overlaying hard alloy inconel 625, and the thickness of a welding layer is not less than 3.5mm. Specifically, the oil pipe head body, the small four-way joint, valve bodies and valve covers of all valves and all flanges are prepared from high-temperature-resistant and sulfur-resistant low alloy steel 4130; all the bolt and nut components, the jackscrew component except the jackscrew filler, the screwed plug joint and the other components are made of inconel 725 materials; all the metal sealing rings are made of inconel 825 alloy materials; all nonmetallic sealing parts/rings are made of modified polytetrafluoroethylene materials, and have good sealing effect below 300 ℃. The modified polytetrafluoroethylene is prepared from polytetrafluoroethylene, fluororubber, phenolic epoxy resin, a vulcanizing agent, bronze powder, graphene and molybdenum disulfide. The vulcanizing agent consists of vulcanizing agent PDM, sulfur and white carbon.
Further, the ultrahigh-pressure ultrahigh-temperature high-sulfur-resistance HH-level gas production wellhead device is subjected to hydrostatic pressure experiments, and rated working pressure is 105MPa.
Specifically, the hydrostatic test process of the gas production tree device comprises the following steps: (1) The gas production tree device assembled by the device which is subjected to the hydrostatic strength test of the body is completely adopted, and only the test is required to reach the rated working pressure (105 MPa); the pressure is increased from zero to 105MPa, and the pressure stabilizing time is not less than 3min; (2) the pressure drops to zero; (3) The pressure is increased to 105MPa again, the pressure stabilizing time is not less than 15min, (4) the experimental result is that: there were no visible leaks.
Specifically, the hydrostatic test process of the tubing head device is: (1) The four-way joint of the oil pipe assembled by the device for testing the hydrostatic strength of the body is completely adopted, and only needs to be tested to rated working pressure (105 MPa), the pressure is increased from zero to 105MPa, and the pressure stabilizing time is not less than 3min; (2) the pressure drops to zero; (4) The pressure is raised to 105MPa again, and the pressure stabilizing time is not less than 15min; (4) experimental results: there were no visible leaks.
In addition, all of the above manual plate valves were subjected to a hydraulic pressure strength test of 157.5 MPa.
The technical scheme can be seen that the invention has the following beneficial effects: the ultrahigh pressure ultrahigh temperature high sulfur-resistant HH-level gas production wellhead device successfully solves the problems of ultrahigh pressure resistance, high temperature resistance and high sulfur resistance of a well control casing head through material selection; the metal sealing box is sealed in a nonmetal sealing element combination mode, and all the metal sealing rings are prepared from inconel 825 alloy materials; the nonmetallic sealing piece is made of modified polytetrafluoroethylene, and has very good sealing performance at a high temperature of 300 ℃; all sealing surfaces of the gas production wellhead device, which are in contact with the medium, are formed by overlaying hard alloy inconel 625, and the alloy has no upper limit on hydrogen sulfide corrosion; all the bolt and nut assemblies and the jackscrew assembly are made of inconel 725 materials; on the premise of ensuring high pressure resistance, the ultra-high pressure ultra-high temperature high sulfur resistance gas production wellhead device also has the characteristics of high temperature resistance and high sulfur resistance, and the ultra-high pressure ultra-high temperature high sulfur resistance HH level gas production wellhead device is subjected to hydrostatic pressure experiments, and rated working pressure is 105MPa.
Drawings
FIG. 1 is a schematic diagram of the structure of the ultra-high pressure ultra-high temperature high sulfur-resistant HH-level gas production wellhead device according to the present invention
FIG. 2 is a schematic illustration of the tubing head set of the present invention;
FIG. 3 is a schematic view of the tubing hanger of the present invention;
FIG. 4 is a schematic view of the tubing hanger of the present invention;
FIG. 5 is a schematic view of a fifth seal according to the present invention;
fig. 6 is a schematic structural view of a seventh seal according to the present invention:
fig. 7 is a schematic view of the structure of the jack screw assembly according to the present invention.
In the figure: 100 small four-way; 101 a first manual plate valve; 102 a second manual plate valve; 103 a third manual plate valve; 104 a fourth manual plate valve; 105 upper flange; 106, a hydraulic safety valve; 107 a first threaded flange; 108 a first threaded flange; 109 a first bolt and nut assembly; 110 a second bolt and nut assembly; 121 a first square right angle shut off valve; 122 a first fixed throttle; 125 second manual flat valve body; 135 third manual flat valve body; 131 a second square right angle stop valve; 132 a second fixed throttle; 136 a first double-scale sulfur-proof and shock-proof pressure gauge; 137 a first meter flange; 138 first square through shut-off valve; 145 a fourth manual plate valve body; 146 a second double-scale sulfur-proof shock-proof pressure gauge; 148 second square straight cut-through valve 200 tubing head body; 202 a third bolt and nut assembly; 205 a fifth manual plate valve; 206 a sixth manual plate valve; 207 a seventh manual plate valve; 208 eighth manual plate valve; 209 a second threaded flange; 210 a fourth bolt and nut assembly; 214 tubing hanger; 216 a pipeline installation assembly; 218 a jackscrew assembly; 219 a jackscrew body; 220 jackscrew support rings; 221 jackscrew packing; 222 jackscrew clamping ring; 223 jackscrew press cap; 227 first grease injection pressure test assembly; 228 a second grease injection pressure test assembly; 229 a third grease injection pressure test assembly; 231 a first seal; 232 a second seal; 233 a third seal; 234 a fourth seal; 235 a fifth seal; 2351 first upper metal seal ring, 2352 first lower metal seal ring, 2353 first metal pressure ring; 2354 a first P-type seal ring; 236 a sixth seal; 237 a seventh seal; 2371. a second upper metal seal ring; 2372 a second lower metal seal ring; 2373 a second metal pressure ring; 2374. a second P-type sealing ring; 238 an eighth seal; 255 fifth manual flat valve body; 261 third square right angle stop valve; 265 a sixth manual plate valve body; 275 seventh manual flat valve body; 277 a second meter flange; 281. a fourth square right-angle stop valve; 285 eighth manual plate valve body; 38 neck flange.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more, unless otherwise clearly defined.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
The ultrahigh-pressure ultrahigh-temperature high-sulfur-resistance HH-level gas production wellhead device as shown in the figures 1-7 sequentially comprises a gas production tree device and a tubing head device from top to bottom;
the gas production tree device comprises an upper flange 105, a first manual flat valve 101, a hydraulic safety valve 106 and a small four-way valve 100, wherein the upper end of the upper flange 105 is connected with the first manual flat valve 101, the upper end of the first manual flat valve 101 is connected with the hydraulic safety valve 106 through a first screw bolt and nut assembly 109 and a first screw bolt and nut assembly 107, the upper end of the hydraulic safety valve 106 is connected with the small four-way valve 100 through a first screw bolt and nut assembly 108 and a second screw bolt and nut assembly 110, the left bypass of the small four-way valve 100 is connected with the second manual flat valve 102 through the first screw bolt and nut assembly 108 and the second screw bolt and nut assembly 110, the right bypass of the small four-way valve 100 is connected with the third manual flat valve 103 through the first screw bolt and nut assembly 108 and the second screw bolt and nut assembly 110, and the upper end of the small four-way valve 100 is connected with the fourth manual flat valve 104 through the first screw bolt and nut assembly 108 and the second screw bolt and nut assembly 110;
the tubing head device comprises a tubing head body 200, wherein a tubing hanger 214 is arranged at the upper end in the tubing head body 200, and a first sealing piece 231, a group of second sealing pieces 232 and a third sealing piece 233 are arranged between the inner side of the upper flange 105 and the outer side of the upper end of the tubing hanger 214; a set of fourth 234 and fifth 235 seals are provided between the inside of the tubing head body 200 and the outside of the lower end of tubing hanger 214. Tubing hanger 214 is provided with tubing passages 215 at both ends, with tubing mounting assemblies 216 at upper and lower portions of the tubing passages.
In addition, the ultrahigh-pressure ultrahigh-temperature high-sulfur-resistance HH-level gas production wellhead device also comprises a casing head device; the casing head device is arranged at the bottom of the tubing head device; the casing head device adopted by the ultrahigh-pressure ultrahigh-temperature high-sulfur-resistance HH-level gas production wellhead device is referred to in the prior art, and the structure of the casing head device is not specifically described herein.
A fifth manual flat valve 205 and a sixth manual flat valve 206 are arranged on the left bypass of the tubing head body 200, and a seventh manual flat valve 207 and an eighth manual flat valve 208 are respectively arranged on the right bypass of the tubing head body 200; the flange at the lower end of the tubing head body 200 is connected with the neck flange 38 through a third bolt and nut assembly 202; a sixth seal 236, a seventh seal 237 and an eighth seal 238 are disposed between the tubing head body 200 and the neck flange 38.
Further, in the above structure, the second manual flat valve 102 comprises a second manual flat valve body 125, one end of the second manual flat valve body 125 opposite to the small four-way valve 100 is connected with the first fixed throttle valve 122 through the first threaded flange 107 and the first bolt nut assembly 109, the first fixed throttle valve 122 is further connected with the first square right-angle stop valve 121 through the first threaded flange 107 and the first bolt nut assembly 109, the third manual flat valve 103 comprises a third manual flat valve body 135, one end of the third manual flat valve body 135 opposite to the small four-way valve 100 is connected with the second fixed throttle valve 132 through the first instrument flange 137, the second fixed throttle valve 132 is further connected with the second square right-angle stop valve 131 through the first threaded flange 107 and the first bolt nut assembly 109, a first square through stop valve 138 and a first double-scale sulfur-proof pressure gauge 136 are arranged above the first instrument flange 137, and the fourth manual flat valve 104 comprises a fourth manual flat valve body 135, and the second square sulfur-proof valve body 146 opposite to the small four-way valve body 145 through the first threaded flange 107 and the first double-scale sulfur-proof pressure gauge 146.
Further, in the above structure, the fifth manual flat valve 205 comprises a fifth manual flat valve body 255, the sixth manual flat valve 206 comprises a sixth manual flat valve body 265, one end of the fifth manual flat valve body 255 is connected with the tubing head body 200 through a second threaded flange 201 and a fourth bolt nut assembly 210, the opposite other end is connected with the sixth manual flat valve body 265 through a second threaded flange 209 and a third bolt nut assembly 202, the opposite other end of the sixth manual flat valve body 265 opposite to the fifth manual flat valve body 255 is connected with a third square stop valve 261 through a second threaded flange 209 and a third bolt nut assembly 202, the seventh manual flat valve 207 comprises a seventh manual flat valve body 275, one end of the seventh manual flat valve 207 is connected with the tubing head body 200 through a second threaded flange 201 and a fourth bolt nut assembly 210, the opposite other end is connected with the eighth manual flat valve body 265 through a second meter flange 277, and the seventh manual flat valve body 285 is connected with the third square stop valve 261 through a third threaded flange 209, and the third square stop valve body 285 is connected with the third meter square stop valve body 276 through a third threaded flange.
Further, in the above structure, the upper flange 105 is provided with a grease injection pressure test channel I in a radial direction, and the outer ports of the grease injection pressure test channel I are respectively provided with a first grease injection pressure test component 227; one end of the pipeline extends from the pipeline mounting assembly 216 out of the connection control system, the pipeline extends through the pipeline passageway 215, and the other end is connected to a subsurface safety valve. A jackscrew channel is further formed in the radial direction from the flange at the upper end of the tubing head body 200, the jackscrew channel is arranged at the lower end of the wiring duct, and a jackscrew assembly 218 is arranged in the jackscrew channel. Further, in the above structure, two grease injection pressure test channels ii are radially opened in the flange at the lower end of the tubing head body 200, a group of second grease injection pressure test assemblies 228 are respectively installed at the outer ports of the grease injection pressure test channels ii, two grease injection pressure test channels iii are radially opened at the lower end of the neck flange 38, a group of third grease injection pressure test assemblies 229 are respectively installed at the outer ports of the grease injection pressure test channels iii, a sixth sealing member 236 is connected in the grease injection pressure test channels ii, an eighth sealing member 238 is connected in the grease injection pressure test channels ii, and the first grease injection pressure test assemblies 227, the second grease injection pressure test assemblies 228 and the third grease injection pressure test assemblies 229 all comprise plug connectors and grease injection pressure test valves.
Further, in the above structure, the fourth sealing member 234 is a non-metal sealing ring of type 0 made of modified polytetrafluoroethylene; the fifth sealing member 235 is composed of a first upper metal sealing ring 2351, a first lower metal sealing ring 2352, a first metal pressing ring 2353 and a first P-type sealing ring 2354; the seventh sealing member 237 is composed of a second upper metal sealing ring 2371, a second lower metal sealing ring 2372, a second metal pressing ring 2373 and a second P-type sealing ring 2374; the first sealing member 231, the third sealing member 233 and the eighth sealing member 238 are octagonal ring metal steel rings; the sixth seal 236 and the eighth seal 238 are non-metal BT seal ring structures made of modified polytetrafluoroethylene.
Further, in the above structure, the jack screw assembly 218 includes a jack screw body 219, a jack screw supporting ring 220, a jack screw packing 221, a jack screw pressing ring 222 and a jack screw pressing cap 223, wherein the jack screw body 219 is sequentially connected with the jack screw supporting ring 220, the jack screw packing 221 and the jack screw pressing ring 222, the jack screw pressing cap 223 is disposed on the right side of the jack screw body 219, the end of the jack screw body 219 extends to the shoulder inclined plane of the oil pipe hanger, and the jack screw body 219 is connected with the oil pipe hanger 214 in a conical surface fit manner.
Further, in the above structure, the first bolt-nut assembly 109 includes a stud bolt, a nut, and a gasket ring; the second bolt and nut assembly 110 includes a wire-fed bolt, a nut, and a seal grommet; the third bolt and nut assembly 202 includes a stud, a nut, and a seal grommet; the fourth bolt and nut assembly 210 includes a wire spool, a nut, and a seal grommet.
In the structure, the pressure-bearing piece of the ultrahigh-pressure ultrahigh-temperature high-sulfur-resistance HH-level gas production wellhead device is prepared from low alloy steel 4130 capable of bearing ultrahigh pressure and resisting high temperature and sulfur and nickel-based alloy 725, sealing surfaces in contact with a medium are all formed by overlaying hard alloy inconel 625, and the thickness of a welding layer is not less than 3.5mm. Specifically, the oil pipe head body, the small four-way joint, valve bodies and valve covers of all valves and all flanges are prepared from high-temperature-resistant and sulfur-resistant low alloy steel 4130; all the bolt and nut components, the jackscrew component except the jackscrew filler, the screwed plug joint and the other components are made of inconel 725 materials; all the metal sealing rings are made of inconel 825 alloy materials; all nonmetallic sealing parts/rings are prepared from modified polytetrafluoroethylene materials, and have good sealing effect below 300 ℃. The modified polytetrafluoroethylene is prepared from polytetrafluoroethylene, fluororubber, phenolic epoxy resin, a vulcanizing agent, bronze powder, graphene and molybdenum disulfide. The vulcanizing agent consists of vulcanizing agent PDM, sulfur and white carbon.
Further, the ultrahigh-pressure ultrahigh-temperature high-sulfur-resistance HH-level gas production wellhead device is subjected to hydrostatic pressure experiments, and rated working pressure is 105MPa. Specifically, the hydrostatic test process of the gas production tree device comprises the following steps: (1) The gas production tree device assembled by the device which is subjected to the hydrostatic strength test of the body is completely adopted, and only the test is required to reach the rated working pressure (105 MPa); the pressure is increased from zero to 105MPa, and the pressure stabilizing time is not less than 3min; (2) the pressure drops to zero; (3) The pressure is raised to 105MPa again, and the pressure stabilizing time is not less than 15min; (4) experimental results: there were no visible leaks.
Specifically, the hydrostatic test process of the tubing head device is: (1) The four-way joint of the oil pipe assembled by the device for testing the hydrostatic strength of the body is completely adopted, and only needs to be tested to rated working pressure (105 MPa), the pressure is increased from zero to 105MPa, and the pressure stabilizing time is not less than 3min; (2) the pressure drops to zero; (4) The pressure is raised to 105MPa again, and the pressure stabilizing time is not less than 15min; (4) experimental results: there were no visible leaks.
The foregoing is merely a preferred embodiment of the invention, and it should be noted that modifications could be made by those skilled in the art without departing from the principles of the invention, which modifications would also be considered to be within the scope of the invention.
Claims (1)
1. An ultrahigh pressure ultrahigh temperature high sulfur-resistant HH-level gas production wellhead device is characterized in that: the device comprises a gas production tree device and a tubing head device from top to bottom in sequence;
the gas production tree device comprises an upper flange (105), a first manual flat valve (101), a hydraulic safety valve (106) and a small four-way valve (100), wherein the upper end of the upper flange (105) is connected with the first manual flat valve (101), the upper end of the first manual flat valve (101) is connected with the hydraulic safety valve (106) through a first bolt nut assembly (109) and a first thread flange (107), the upper end of the hydraulic safety valve (106) is connected with the small four-way valve (100) through a first thread flange (108) and a second bolt nut assembly (110), the left bypass of the small four-way valve (100) is connected with the second manual flat valve (102) through a first thread flange (108) and a second bolt nut assembly (110), the right bypass of the small four-way valve (100) is connected with a third manual flat valve (103) through a first thread flange (108) and a second bolt nut assembly (110), and the upper end of the small four-way valve (100) is connected with the fourth manual flat valve (104) through a first thread flange (108) and a second bolt nut assembly (110);
the tubing head device comprises a tubing head body (200), wherein the upper end in the tubing head body (200) is provided with a tubing hanger (214), and a first sealing element (231), a group of second sealing elements (232) and a third sealing element (233) are arranged between the inner side of the upper flange (105) and the outer side of the upper end of the tubing hanger (214); a group of fourth sealing elements (234) and fifth sealing elements (235) are arranged between the inner side of the tubing head body (200) and the outer side of the lower end of the tubing hanger (214);
a fifth manual flat valve (205) and a sixth manual flat valve (206) are arranged on the left bypass of the tubing head body (200), and a seventh manual flat valve (207) and an eighth manual flat valve (208) are respectively arranged on the right bypass of the tubing head body (200); the flange at the lower end of the oil pipe head body (200) is connected with the neck flange (38) through a third bolt and nut assembly (202); a sixth sealing piece (236), a seventh sealing piece (237) and an eighth sealing piece (238) are arranged between the oil pipe head body (200) and the neck flange (38);
the second manual flat valve (102) comprises a second manual flat valve body (125), one end, opposite to the small four-way valve (100), of the second manual flat valve body (125) is connected with a first fixed throttle valve (122) through a first threaded flange (107) and a first bolt and nut assembly (109), and the first fixed throttle valve (122) is also connected with a first square right-angle stop valve (121) through the first threaded flange (107) and the first bolt and nut assembly (109); the third manual flat valve (103) comprises a third manual flat valve body (135), one end, opposite to the small four-way valve (100), of the third manual flat valve body (135) is connected with a second fixed throttle valve (132) through a first meter flange (137), the second fixed throttle valve (132) is further connected with a second square right-angle stop valve (131) through a first thread flange (107) and a first bolt nut assembly (109), and a first square straight-through stop valve (138) and a first double-scale sulfur-proof and shock-proof pressure gauge (136) are arranged above the first meter flange (137); the fourth manual flat valve (104) comprises a fourth manual flat valve body (145), and one end, opposite to the small four-way joint, of the fourth manual flat valve body (145) is connected with a second square straight-through stop valve (148) and a second double-scale sulfur-proof and shock-proof pressure gauge (146) through a first threaded flange (107) and a first bolt nut assembly (109);
the fifth manual flat valve (205) comprises a fifth manual flat valve body (255), the sixth manual flat valve (206) comprises a sixth manual flat valve body (265), one end of the fifth manual flat valve body (255) is connected with the tubing head body (200) through a second threaded flange (201) and a fourth bolt and nut assembly (210), the opposite end is connected with the sixth manual flat valve body (265) through a second threaded flange (209) and a third bolt and nut assembly (202), and the other end of the sixth manual flat valve body (265) opposite to the fifth manual flat valve body (255) is connected with a third square right-angle stop valve (261) through a second threaded flange (209) and a third bolt and nut assembly (202); the seventh manual flat valve (207) comprises a seventh manual flat valve body (275), the eighth manual flat valve (208) comprises an eighth manual flat valve body (285), one end of the seventh manual flat valve (207) is connected with the tubing head body (200) through a second screw flange (201) and a fourth bolt nut assembly (210), the opposite other end is connected with the eighth manual flat valve body (285) through a second meter flange (277), and the opposite end of the eighth manual flat valve body (285) to the seventh manual flat valve (207) is connected with a fourth square right-angle stop valve (281) through a second screw flange (209) and a third bolt nut assembly (202); a third square straight-through stop valve (278) and a third double-scale sulfur-proof and shock-proof pressure gauge (276) are arranged above the second meter flange (277);
two pipeline pore canals are formed in the flange at the upper end of the oil pipe head body (200) in the radial direction, a group of pipeline installation assemblies (216) are respectively installed at the outer ports of the pipeline pore canals, and the pipeline installation assemblies (216) are clamping connectors or plugs and perforated press caps and are used for installing and fixing pipelines so that the pipelines penetrate through the middle of the pipeline installation assemblies (216); a jackscrew channel is further formed in the flange at the upper end of the oil pipe head body (200) along the radial direction, the jackscrew channel is arranged at the lower end of the wiring duct, and a jackscrew assembly (218) is arranged in the jackscrew channel;
the upper flange (105) is internally provided with a grease injection pressure test channel I along the radial direction, and a first grease injection pressure test component (227) is arranged at the outer port of the grease injection pressure test channel I; two grease injection pressure test pore canals II are formed in the flange at the lower end of the oil pipe head body (200) along the radial direction, and a group of second grease injection pressure test assemblies (228) are respectively arranged at the outer ports of the grease injection pressure test pore canals II; two grease injection pressure test pore canals III are formed in the lower end of the neck flange (38) along the radial direction, and a group of third grease injection pressure test assemblies (229) are respectively arranged at the outer ports of the grease injection pressure test pore canals III; a sixth sealing element (236) is connected in the grease injection pressure test pore passage II, and an eighth sealing element (238) is connected in the grease injection pressure test pore passage II; the second grease injection pressure test assembly (228) and the third grease injection pressure test assembly (229) comprise a screwed plug joint and a grease injection pressure test valve;
the fourth sealing piece (234) is an O-shaped nonmetal sealing ring prepared from modified polytetrafluoroethylene materials; the fifth sealing piece (235) consists of a first upper metal sealing ring (2351), a first lower metal sealing ring (2352), a first metal pressing ring (2353) and a first P-type sealing ring (2354); the seventh sealing piece (237) is composed of a second upper metal sealing ring (2371), a second lower metal sealing ring (2372), a second metal pressing ring (2373) and a second P-type sealing ring (2374); the first sealing piece (231), the third sealing piece (233) and the eighth sealing piece (238) are octagonal ring metal steel rings; the sixth sealing element (236) and the eighth sealing element (238) are both BT sealing ring structures made of modified polytetrafluoroethylene;
the jackscrew assembly (218) comprises a jackscrew body (219), a jackscrew supporting ring (220), a jackscrew filler (221), a jackscrew pressing ring (222) and a jackscrew pressing cap (223); the jackscrew body (219) is sequentially connected with a jackscrew supporting ring (220), jackscrew packing (221) and a jackscrew pressing ring (222), and a jackscrew pressing cap (223) is arranged on the right side of the jackscrew body (219); the end part of the jackscrew body (219) extends to the shoulder inclined plane of the oil pipe hanger, and the jackscrew body (219) is connected with the oil pipe hanger (214) in a conical surface fit manner;
the first bolt and nut assembly (109) comprises a stud, a nut and a sealing grommet; the second bolt and nut assembly (110) comprises a wire planting bolt, a nut and a sealing gasket ring; the third bolt and nut assembly (202) comprises a stud, a nut and a sealing grommet; the fourth bolt and nut assembly (210) comprises a wire planting bolt, a nut and a sealing gasket ring;
the pressure-bearing piece of the ultrahigh-pressure ultrahigh-temperature high-sulfur-resistance HH-level gas production wellhead device is prepared from ultrahigh-pressure-bearing high-temperature-resistant sulfur-resistant low-alloy steel and a nickel-based alloy 725, and sealing surfaces in contact with a medium are formed by overlaying hard alloy inconel 625;
the ultrahigh-pressure ultrahigh-temperature high-sulfur-resistance HH-level gas production wellhead device is subjected to hydrostatic pressure experiments, and rated working pressure is 105MPa;
wherein, adopt gas tree device hydrostatic test process to do: 1. the gas production tree device assembled by the device for carrying out the hydrostatic strength test of the body is completely adopted, and only the test is needed until the rated working pressure is 105MPa; the pressure is increased from zero to 105MPa, and the pressure stabilizing time is not less than 3min; 2. the pressure drops to zero; 3. the pressure is raised to 105MPa again, and the pressure stabilizing time is not less than 15min; 4. experimental results: there were no visible leaks;
the hydrostatic test process of the tubing head device is as follows: 1. the four-way joint of the oil pipe assembled by the device for testing the hydrostatic strength of the body is completely adopted, the pressure is only required to be tested to be 105MPa of rated working pressure, the pressure is increased from zero to 105MPa, and the pressure stabilizing time is not less than 3min; 2. the pressure drops to zero; 3. the pressure is raised to 105MPa again, and the pressure stabilizing time is not less than 15min; 4. experimental results: there were no visible leaks.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113738300A (en) * | 2021-09-22 | 2021-12-03 | 盐城旭东机械有限公司 | Novel sulfur-resistant and scouring-resistant casing head |
| CN116335573B (en) * | 2023-03-27 | 2023-09-26 | 江苏亿德隆石油机械有限公司 | Digital intelligent gas production wellhead device |
| CN117072102B (en) * | 2023-10-18 | 2023-12-19 | 盐城旭东机械有限公司 | 175MPa high pressure gas production wellhead device |
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