CN103883275A - Novel energy-saving environment-friendly gas injection wellhead device - Google Patents

Novel energy-saving environment-friendly gas injection wellhead device Download PDF

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Publication number
CN103883275A
CN103883275A CN201410130476.7A CN201410130476A CN103883275A CN 103883275 A CN103883275 A CN 103883275A CN 201410130476 A CN201410130476 A CN 201410130476A CN 103883275 A CN103883275 A CN 103883275A
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China
Prior art keywords
gate valve
flat gate
way
flange
gas injection
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Pending
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CN201410130476.7A
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Chinese (zh)
Inventor
于冬
李宏
朱国亚
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JIANGSU SHUANGHUI MACHINERY MANUFACTURING Co Ltd
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JIANGSU SHUANGHUI MACHINERY MANUFACTURING Co Ltd
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Priority to CN201410130476.7A priority Critical patent/CN103883275A/en
Publication of CN103883275A publication Critical patent/CN103883275A/en
Pending legal-status Critical Current

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Abstract

The invention discloses a novel energy-saving environment-friendly gas injection wellhead device. The novel energy-saving environment-friendly gas injection wellhead device comprises a casing flange, an intermediate casing, a tubing head spool, a tubing hanger, an oil-string casing, a first flat gate valve, a second flat gate valve, a first threaded flange, a first pressure meter assembly, a multifunctional blowout preventer, a small cross, a third flat gate valve, a fourth flat gate valve, a second threaded flange and a second pressure meter assembly. The casing flange is connected with the intermediate casing, the casing flange is connected with the tubing head spool, and the tubing hanger is connected with the oil-string casing. The first flat gate valve and the second flat gate valve are arranged on the tubing head spool, the first threaded flange is connected with the first flat gate valve, and the first pressure meter assembly is connected with the second flat gate valve; the multifunctional blowout preventer is connected with the tubing head spool and the small cross, the third flat gate valve and the fourth flat gate valve are arranged on the small cross, the second threaded flange is connected with the third flat gate valve, and the second pressure meter assembly is connected with the fourth flat gate valve. The novel energy-saving environment-friendly gas injection wellhead device effectively prevents CO2 gas from leaking outside, the blowout preventer is installed in one step, and the operation efficiency is high.

Description

A kind of novel energy-saving environment-friendly gas injection wellhead assembly
Technical field
The present invention relates to a kind of petroleum machinery wellhead assembly, relate in particular to a kind of novel energy-saving environment-friendly gas injection wellhead assembly.
 
Background technology
Along with the develop rapidly in oil field, environment pollution has also become more and more important problem.Gas injection wellhead assembly is emerging in recent years a kind of wellhead assembly, at present has started to apply at the Daqing oil field of the having of the Northeast of China " oil all, the city in hundred lakes " good reputation.The major function of gas injection wellhead assembly is to subterranean strata natural gas block injecting carbon dioxide gas by production string, principle is the density that the density of carbon dioxide is greater than down-hole natural gas, by can make the natural gas floating of down-hole to underground injecting carbon dioxide gas, thereby reach the object of " purging exploitation ", coordinate again the use of packer, the packing of space, down-hole can be become to some regions, thereby can carry out respectively purging to Different Strata, for later natural gas extraction is prepared.
Existing gas injection well head apparatus structure tradition, mainly by tubing head four-way, hanger, little four-way, the structure design of flat gate valve combination, this traditional structure design is at production wellhead, in water injection well operation, can also normally use, but this to product specification rank for gas injection operation, performance class requires high operating environment, the structure design of common gas injection wellhead assembly at work safety factor is compared oil recovery, water filling operation reduces greatly, show that according to the data of oil field feedback existing gas injection wellhead assembly is injecting often generation CO2 Leakage Gas of CO2 gas operation to down-hole, once occur to leak and there is no effective solution route according to existing technical condition, can only discharge bottom pressure, the result causing is exactly, first, discharge a large amount of highdensity CO2 gas in air, when affecting natural ecological environment, the periphery masses' daily life is caused to extremely bad impact, sometimes even cause the periphery masses' fear, bring great inconvenience to people life, second, well head occurs to leak workman's life security of field operation is caused to great threat, CO2 gas under Injection Well is all that low temperature (69 DEG C) is liquid, even if channel to temperature aboveground also below-40 DEG C, operating pressure more than additional 20MPa, once so leak suddenly, be sprayed onto on the body of operating worker and may be fatal, similarly accident just occurred in the past, the 3rd, just relate to later period maintenance once there is well head leakage accident, oil field equipment is mostly made up of huge steel machinery structure, wellhead maintenance will relate to a large amount of mechanized equipment of migration, so needs to drop into a large amount of manpower and also slatterns a large amount of energy as water resource, electric energy etc. simultaneously.Common gas injection wellhead assembly operating cost is high in sum, efficiency is low, maintenance is complicated, easily pollute environment, waste energy, and can better not adapt to the needs of the times.
 
Summary of the invention
Object of the present invention: a kind of novel energy-saving environment-friendly gas injection wellhead assembly is provided, and simple to operation, operating efficiency is high, only needs once mounting preventer; Maintenance and repair cost is low, job safety anti-leak; Energy conservation, anti-environment pollution.
To achieve these goals, technical scheme of the present invention is:
A kind of novel energy-saving environment-friendly gas injection wellhead assembly, comprises casing flange, protective casing, tubing head four-way, boll-weevil hanger, production string, many stop jackscrews, the first flat gate valve, the second flat gate valve, the first thread flange, the first pressure meter assembly, multifunctional capping device, little four-way, the 3rd flat gate valve, the 4th flat gate valve, the second thread flange and the second pressure meter assemblies; In described casing flange, establish 5 1/2inLC internal threads, the external surface correspondence of described protective casing is provided with 5 1/2inLC external screw threads, and described casing flange and described protective casing are threaded connection; The upper end of described casing flange is connected with described tubing head four-way by bolt, described boll-weevil hanger is arranged in described tubing head four-way, in described boll-weevil hanger, establish 2 7/8inNU internal threads, on the outer wall of described production string, correspondence is provided with 2 7/8inNU external screw threads, described boll-weevil hanger and described production string are threaded connection, described production string is positioned at described protective casing, and many described stop jackscrews are evenly distributed on the top of described boll-weevil hanger; The first described flat gate valve and the second flat gate valve are symmetricly set on respectively the both wings of described tubing head four-way, the first described thread flange is connected on the first described flat gate valve, and the first described pressure meter assembly is connected on the second described flat gate valve; The lower end of described multifunctional capping device is connected with described tubing head four-way by bolt, the upper end of described multifunctional capping device is connected with described little four-way by bolt, the 3rd described flat gate valve and the 4th flat gate valve be the symmetrical both sides that are arranged on described little four-way respectively, the second described thread flange is connected on the 3rd described flat gate valve, and the second described pressure meter assembly is connected on the 4th described flat gate valve.
Above-mentioned novel energy-saving environment-friendly gas injection wellhead assembly, wherein, described multifunctional capping device is the upper and lower double-layer structure of integral type, and the upper strata of described multifunctional capping device is half envelope flashboard, and the lower floor of described multifunctional capping device is blind rams.
Above-mentioned novel energy-saving environment-friendly gas injection wellhead assembly, wherein, the upper end of described little four-way is provided with the 5th flat gate valve, on the 5th described flat gate valve, is connected with the 3rd thread flange.
Above-mentioned novel energy-saving environment-friendly gas injection wellhead assembly, wherein, is provided with gasket ring between described casing flange and described tubing head four-way, and described casing flange and described tubing head four-way are tightly connected.
The anti-CO2 that the present invention has increased gas injection wellhead assembly greatly leaks safety factor; effectively prevent CO2 Leakage Gas pollution on the environment; and only need once mounting preventer; simple to operate, operating efficiency is high; save a large amount of later period maintenance costs; save a large amount of manpower expenses and electric energy water energy equal energy source, protected environment.
 
Brief description of the drawings
Fig. 1 is the structural representation of a kind of novel energy-saving environment-friendly gas injection of the present invention wellhead assembly.
Detailed description of the invention
Further illustrate embodiments of the invention below in conjunction with accompanying drawing.
Refer to shown in accompanying drawing 1, a kind of novel energy-saving environment-friendly gas injection wellhead assembly, comprises casing flange 1, protective casing 2, tubing head four-way 3, boll-weevil hanger 4, production string 5, many stop jackscrews 6, the first flat gate valve 7, the second flat gate valve 8, the first thread flange 9, the first pressure meter assembly 10, multifunctional capping device 11, little four-way 12, the 3rd flat gate valve 13, the 4th flat gate valve 14, the second thread flange 15 and the second pressure meter assemblies 16, in described casing flange 1, establish 5 1/2inLC internal threads, the external surface correspondence of described protective casing 2 is provided with 5 1/2inLC external screw threads, and described casing flange 1 is threaded connection with described protective casing 2, the upper end of described casing flange 1 is connected with described tubing head four-way 3 by bolt, described boll-weevil hanger 4 is arranged in described tubing head four-way 3, in described boll-weevil hanger 4, establish 2 7/8inNU internal threads, on the outer wall of described production string 5, correspondence is provided with 2 7/8inNU external screw threads, described boll-weevil hanger 4 is threaded connection with described production string 5, described production string 5 is positioned at described protective casing 2, many described stop jackscrews 6 are evenly distributed on the top of described boll-weevil hanger 4, preferably 4 of stop jackscrews 6, retractable, while preventing from cementing the well, down-hole pressure makes to alter on hanger, thereby realize sealing annular space, the first described flat gate valve 7 and the second flat gate valve 8 are symmetricly set on respectively the both wings of described tubing head four-way 3, when well cementation, be used for discharging the mud and the cementing fluid that overflow in shaft bottom, the first described thread flange 9 is connected on the first described flat gate valve 7, the first described pressure meter assembly 10 is connected on the second described flat gate valve 8, in the time of well cementing operation, unload the little plug on the first thread flange 9, pipe joint is screwed on the first thread flange 9, discharge mud and the cementing fluid that overflow down-hole, open the second dull and stereotyped valve 8 simultaneously and can observe at any time down-hole pressure in well cementing operation process by the first pressure meter assembly 10, the lower end of described multifunctional capping device 11 is connected with described tubing head four-way 3 by bolt, the upper end of described multifunctional capping device 11 is connected with described little four-way 12 by bolt, the 3rd described flat gate valve 13 and the 4th flat gate valve 14 be the symmetrical both sides that are arranged on described little four-way 12 respectively, the second described thread flange 15 is connected on the 3rd described flat gate valve 13, the second described pressure meter assembly 16 is connected on the 4th described flat gate valve 14, the 3rd flat gate valve 13 effects are in the time of gas injection operation, unload the plug on the second thread flange 15, the gas injection pipeline of screwing on, by pipeline to down-hole injecting carbon dioxide gas, by rotating the keying that handwheel on the 3rd dull and stereotyped plate valve 13 can by-pass valve control, thereby control gas injection process, the operation of the 4th flat gate valve 14 is in the time of gas injection operation, to open valve, aboveground and down-hole keeps UNICOM, thereby by the pressure of the second pressure meter assembly 16 real-time monitored down-hole carbon dioxides, control gas injection rhythm to coordinate the needs of gas injection technology.
Described multifunctional capping device 11 is the upper and lower double-layer structures of integral type, the upper strata of described multifunctional capping device 11 is half envelope flashboards, the lower floor of described multifunctional capping device 11 is blind rams, multifunctional capping device 11 is core components of the present invention, its effect is shut-in well in the time that subsurface environment suddenlys change, anti-CO2 Leakage Gas, anti-pollution environment.
The information feeding back according to oil field shows, CO2 Leakage Gas mostly occurs in the position of the primary path of tubing head four-way 3, the present invention replaces original valve installation multifunctional capping device 11, the valve that multifunctional capping device 11 is compared original position has following advantage, first, common valve only has one deck flashboard, sealing performance mainly relies on flashboard and valve base sealing to ensure, " the single sealing " being namely commonly called as, sealing performance is not high, safety factor is low, other positions that the valve of this single sealing is placed on production tree are as used on bypass, but the words security performance using at this core of primary path position cannot ensure.Multifunctional capping device 11 agent structures of the present invention are made up of upper and lower two-layer guillotine mechanism, its blind rams mechanism of lower floor is separately installed with top sealing and front sealing at flashboard top and side, containment member adopts imported from America FSL rubber, experimental data shows to compare traditional flashboard and seals the anti-CO2 corrosive power raising 150% of this structure, sealing performance is far longer than traditional flashboard valve sealing, anti-CO2 leaks ability and greatly improves, compare traditional gate valve, multifunctional capping device 11 can well be controlled subsurface environment on main latus rectum, carbon dioxide corrosion-resistant ability strengthens, stability in use is better, job safety coefficient improves greatly, bottom flashboard can only be worked under the condition of standard-sized sheet full cut-off, while altering on CO2 gas in main reply gas injection process, close flashboard shut-in well, the innovation that flashboard is partly sealed on upper strata is that flashboard is detachable, can be according to underground work needs, change the flashboard (being generally 2 7/8in or 3 1/2in) with different pore size, the flashboard that partly seals that can cut out at once upper strata like this in the time of underground work generation emergency case embraces underground operation tool connecting rod, in the situation that suddenling change, can accomplish subsurface environment to seal in time down hole annular space, multifunctional capping device 11 has been realized the integrated operation of underground work, avoid kill job numerous and diverse and that waste time and energy, can save a large amount of manpower and materials and water, electric power equal energy source, adopting second advantage of multifunctional capping device 11 is in entirety, to arrange up and down two-layer flashboard, there is the feature of compact conformation, it is more stable that this kind of structure compared traditional production tree structure, upper and lower two-layer flashboard handwheel direction is in 90 ° mutually, be uniformly distributed four handwheels in 360 ° of directions of wellhead assembly like this, operation power balance more in the time of operation, balance is higher, longer service life, maintenance cost reduces greatly comparatively speaking, upper and lower double sealing structure has been realized dual fail-safe in addition, has the advantages that security performance is higher.
The upper end of described little four-way 12 is provided with the 5th flat gate valve 17, on the 5th described flat gate valve 17, be connected with the 3rd thread flange 18, the 5th flat gate valve 17 is all being closed in the time of operation at ordinary times, only in the time that being lowered to downhole tool, just open by needs valve, unload the 3rd thread flange 18 plug above, be lowered to downhole tool by the vertical latus rectum of well head to down-hole.
Between described casing flange 1 and described tubing head four-way 3, be provided with gasket ring, described casing flange 1 and described tubing head four-way 3 are tightly connected, in compressing, realize metal sealing by gasket ring, can well seal the annular space of casing flange 1, change accessory convenient easily.
The first flat gate valve 7, the second flat gate valve 8, the 3rd flat gate valve 13, the 4th flat gate valve 14 and the 5th flat gate valve 17 adopt 2 9/16in-5000psi flat gate valves.2 9/16in-5000psi flat gate valves are made up of component such as valve body, flashboard, valve seat, valve gap, valve rod, balancing poles, valve is rising stem type structure, the load that two strong thrust ball bearings of load-bearing capacity bear valve opening and closing is housed in valve, thereby have advantages of that switch moment is little, the balancing pole of valve body afterbody can make valve can realize the operation light and flexible in high-voltage load situation, has ensured the overall sealing performance of apparatus of the present invention.
Screw thread specification on casing flange 1, protective casing 2, boll-weevil hanger 4 and production string 5 comes from standard GB/T 22513-2008 " industrial gas oil drilling well and oil production equipment wellhead assembly and production tree ".
In sum; the anti-CO2 that the present invention has increased gas injection wellhead assembly greatly leaks safety factor; effectively prevent CO2 Leakage Gas pollution on the environment; and only need once mounting preventer; simple to operate, operating efficiency is high; save a large amount of later period maintenance costs, saved a large amount of manpower expenses and electric energy water energy equal energy source, protected environment.

Claims (4)

1. a novel energy-saving environment-friendly gas injection wellhead assembly, is characterized in that: comprise casing flange, protective casing, tubing head four-way, boll-weevil hanger, production string, many stop jackscrews, the first flat gate valve, the second flat gate valve, the first thread flange, the first pressure meter assembly, multifunctional capping device, little four-way, the 3rd flat gate valve, the 4th flat gate valve, the second thread flange and the second pressure meter assemblies; In described casing flange, establish 5 1/2inLC internal threads, the external surface correspondence of described protective casing is provided with 5 1/2inLC external screw threads, and described casing flange and described protective casing are threaded connection; The upper end of described casing flange is connected with described tubing head four-way by bolt, described boll-weevil hanger is arranged in described tubing head four-way, in described boll-weevil hanger, establish 2 7/8inNU internal threads, on the outer wall of described production string, correspondence is provided with 2 7/8inNU external screw threads, described boll-weevil hanger and described production string are threaded connection, described production string is positioned at described protective casing, and many described stop jackscrews are evenly distributed on the top of described boll-weevil hanger; The first described flat gate valve and the second flat gate valve are symmetricly set on respectively the both wings of described tubing head four-way, the first described thread flange is connected on the first described flat gate valve, and the first described pressure meter assembly is connected on the second described flat gate valve; The lower end of described multifunctional capping device is connected with described tubing head four-way by bolt, the upper end of described multifunctional capping device is connected with described little four-way by bolt, the 3rd described flat gate valve and the 4th flat gate valve be the symmetrical both sides that are arranged on described little four-way respectively, the second described thread flange is connected on the 3rd described flat gate valve, and the second described pressure meter assembly is connected on the 4th described flat gate valve.
2. novel energy-saving environment-friendly gas injection wellhead assembly according to claim 1, it is characterized in that: described multifunctional capping device is the upper and lower double-layer structure of integral type, the upper strata of described multifunctional capping device is half envelope flashboard, and the lower floor of described multifunctional capping device is blind rams.
3. novel energy-saving environment-friendly gas injection wellhead assembly according to claim 1, is characterized in that: the upper end of described little four-way is provided with the 5th flat gate valve, on the 5th described flat gate valve, is connected with the 3rd thread flange.
4. novel energy-saving environment-friendly gas injection wellhead assembly according to claim 1, is characterized in that: between described casing flange and described tubing head four-way, be provided with gasket ring, described casing flange and described tubing head four-way are tightly connected.
CN201410130476.7A 2014-04-02 2014-04-02 Novel energy-saving environment-friendly gas injection wellhead device Pending CN103883275A (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106639904A (en) * 2016-12-20 2017-05-10 成都佰思汇信科技有限责任公司 Composite four-way structure
CN107701140A (en) * 2016-11-08 2018-02-16 徐海英 A kind of production wellhead no killing well well-sealing device
CN108252681A (en) * 2017-12-27 2018-07-06 中国石油天然气股份有限公司 Thermal recovery well operations channeling prevention and control device and its method
CN110392767A (en) * 2017-03-21 2019-10-29 通用电气公司 Spraying-preventing system including totally-enclosed shear ram
CN112647885A (en) * 2020-12-31 2021-04-13 江苏信得石油机械股份有限公司 Casing head for preventing leakage of oil field well mouth
CN114517655A (en) * 2021-12-27 2022-05-20 深圳市百勤石油技术有限公司 Economic small-wellhead gas production tree system suitable for natural gas hydrate exploitation
CN114526047A (en) * 2021-12-31 2022-05-24 中国石油天然气集团有限公司 Underground coal gasification method and system, injection wellhead device and related application

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107701140A (en) * 2016-11-08 2018-02-16 徐海英 A kind of production wellhead no killing well well-sealing device
CN107701140B (en) * 2016-11-08 2019-06-04 徐海英 A kind of production wellhead no killing well well-sealing device
CN106639904A (en) * 2016-12-20 2017-05-10 成都佰思汇信科技有限责任公司 Composite four-way structure
CN110392767A (en) * 2017-03-21 2019-10-29 通用电气公司 Spraying-preventing system including totally-enclosed shear ram
CN108252681A (en) * 2017-12-27 2018-07-06 中国石油天然气股份有限公司 Thermal recovery well operations channeling prevention and control device and its method
CN112647885A (en) * 2020-12-31 2021-04-13 江苏信得石油机械股份有限公司 Casing head for preventing leakage of oil field well mouth
CN112647885B (en) * 2020-12-31 2022-07-15 江苏信得石油机械股份有限公司 Casing head for preventing leakage of oil field well head
CN114517655A (en) * 2021-12-27 2022-05-20 深圳市百勤石油技术有限公司 Economic small-wellhead gas production tree system suitable for natural gas hydrate exploitation
CN114526047A (en) * 2021-12-31 2022-05-24 中国石油天然气集团有限公司 Underground coal gasification method and system, injection wellhead device and related application

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Application publication date: 20140625