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CN104845692A - Oilfield associated gas complete liquefaction recovery system and method thereof - Google Patents

Oilfield associated gas complete liquefaction recovery system and method thereof Download PDF

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Publication number
CN104845692A
CN104845692A CN201510156325.3A CN201510156325A CN104845692A CN 104845692 A CN104845692 A CN 104845692A CN 201510156325 A CN201510156325 A CN 201510156325A CN 104845692 A CN104845692 A CN 104845692A
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CN
China
Prior art keywords
gas
condenser
associated gas
regenerator
recovery
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Pending
Application number
CN201510156325.3A
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Chinese (zh)
Inventor
孙大明
张宁
张冲
徐雅
沈惬
乔鑫
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JIANGSU CRYOTE CRYOGENIC TECHNOLOGY Co Ltd
Zhejiang University ZJU
Original Assignee
JIANGSU CRYOTE CRYOGENIC TECHNOLOGY Co Ltd
Zhejiang University ZJU
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Priority to CN201510156325.3A priority Critical patent/CN104845692A/en
Publication of CN104845692A publication Critical patent/CN104845692A/en
Pending legal-status Critical Current

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Abstract

The invention discloses an oilfield associated gas complete liquefaction recovery system and a method thereof. The system comprises, sequentially connected, an associated gas pretreatment apparatus, a heat regenerator, a first condenser, a gas-liquid separation device, a throttle valve, a second condenser, an LNG storage tank and a regulating valve, the associated gas pretreatment apparatus comprises, sequentially connected, an oil removal device, a dedusting purification device, an acidic gas removal device, a hydration device and a nitrogen adsorption and separation device, the light hydrocarbon outlet of the heat regenerator is connected with the regulating valve, and the lower portion of the gas-liquid separation device is connected with the light hydrocarbon inlet of the heat regenerator. Separating recovery of light hydrocarbons in the oilfield associated gas and liquefaction of natural gas are simultaneously realized by using cold energy provided with above two stage condensing heat exchange devices. The system and the method have the advantages of solving of the recovery problem of remote region oil and gas wellhead associated gas, convenient operation, low cost, high resource recovery rate, no pollution, realization of zero discharge in the oilfield oil extraction process, and obvious resource saving and environment protection effects.

Description

A kind of associated gas liquefies recovery system and method thereof entirely
Technical field
Field of the present invention belongs to petrochemical complex and energy-conserving and environment-protective field, and particularly a kind of associated gas liquefies recovery system and method thereof entirely.
Background technology
Oil field gas be under earth's surface in pore formation innately based on the fuel mixture that the hydrocarbon gas of low molecule stable hydrocarbon and a small amount of non-hydrocarbon gases form, it is usually together with crude oil association.Oil field gas component great majority, based on methane, comprise the hydro carbons such as ethane, propane, butane, pentane, and the gas such as a small amount of nitrogen, carbonic acid gas, hydrogen sulfide, helium, oxygen, hydrogen.
China is developing country, makes full use of and reclaims associated gas resource to the development of China's economy with society, the protection of environment, have very important meaning.The Recovery Purifying technology of oil field gas is all have employed in current many elephant oil wells, but in a lot of outlying oil field, due to landform relative complex, pipe laying difficulty, the reasons such as economy is bad, produced oil field gas is caused mostly to adopt emptying to burn, the associated gas burnt every year about 1,000,000,000 m 3, be equivalent to 1,000,000 tons of oil, along with the further opening in oil field, inland, this type of associated gas resource more and more will be wasted.Propose in " Chinese Policy of Technology For Energy Saving outline ": " associated gas recovery and utilization technology must be widelyd popularize ", " self-contained oil field necessary synchronized construction associated gas, condensate oil recvery facility ".The environmental pollution caused energy extraction process along with country and the increasing of energy dissipation improvement and rectification dynamics, rationally recycling this type of associated gas has been the task of top priority, also will be an inexorable trend of the long-term sustainable development of the domestic energy.
The scattered associated gas resource in side area have narrow-minded, air pressure is low, point spreading, quantity are many, reclaim the feature of difficulty, must adopt that treatment capacity is little, less investment and the large sledge-borne type recovery and utilization technology on the spot of turndown ratio.In existing associated gas recovery method, basic employing ammonia refrigeration, expander refrigeration or mixing medium refrigeration provides cold, be separated and produce lighter hydrocarbons, liquefied gas and dry gas, equipment is huge, cost of investment is higher, and be not suitable for the little tolerance associated gas of individual well, and the recycling of side area oil-gas field associated gas without pipe network.
For the outlying stingy amount associated gas that cannot enter gas distributing system and directly emptying, the cold of two warm areas utilizing two-stage low temperature refrigerator or other low-temperature receivers to provide, develops the flow path device that a kind of Separation and Recovery lighter hydrocarbons and Sweet natural gas liquefy entirely.
Summary of the invention
The object of the invention is for prior art Shortcomings, provide a kind of associated gas entirely to liquefy recovery system and method thereof.There is the advantage that cost of investment is low, easy to operate, turndown ratio is large.
The technical solution used in the present invention is:
The associated gas recovery system that entirely liquefies comprises the associated gas pretreatment unit, regenerator, the first condenser, gas-liquid separator, throttling valve, the second condenser, LNG storage tank, the variable valve that connect in turn, associated gas pretreatment unit comprises the oil removal plant, dedusting and purifying device, acid gas removal body device, dewatering unit, the fractionation by adsorption nitrogen device that connect in turn, the outlet of regenerator lighter hydrocarbons is connected with variable valve, and gas-liquid separator bottom is connected with the import of regenerator lighter hydrocarbons.
Described LNG storage tank and the second condenser form loop.The mode that described dedusting and purifying device selects cyclonic separator, wire cloth and hollow fiber cartridge to combine according to source of the gas clean level, or only adopt wire cloth and hollow fiber cartridge.
The associated gas recovery method that entirely liquefies is: associated gas, first by oil removal plant, dedusting and purifying device, acid gas removal body device, dewatering unit, fractionation by adsorption nitrogen device, departs to fall liquid oil, solid impurity, CO successively 2and H 2s sour gas, water and nitrogen, then the first condenser heat exchange condensation is entered, condensing temperature is-60 DEG C ~-120 DEG C, condensation and separation of lighter hydrocarbons, discharge the cold reclaiming lighter hydrocarbons and realize cold recycling by regenerator, enter the second condenser heat exchange condensation after dry gas throttling cooling, condensing temperature is-162 DEG C, and dry gas liquefies and is stored in LNG storage tank in secondary condenser.
The cold of described first condenser, the second condenser by sterlin refrigerator, vascular refrigerator, hot sound refrigerating machine, the small-sized Cryo Refrigerator of G-M refrigerator one or more provide, or cryogen provides; Described dry gas expenditure and pressure is to 0.12-0.13MPa.
The cold that the present invention provides by utilizing condensed in two stages heat-exchanger rig (High cooling power sterlin refrigerator can be adopted to provide low-temperature receiver), achieves the Separation and Recovery of the lighter hydrocarbons in associated gas and the liquefaction of Sweet natural gas simultaneously.This technical process can not only solve the recovery problem of oil and gas wellhead associated gas from far-off regions, and easy to operate, and cost is low, and resource recovery is high, pollution-free, achieves the zero release in oil extraction in oil field process, is economizing on resources and Be very effective in protection of the environment.
Accompanying drawing explanation
Fig. 1 is that associated gas liquefies recovery system structural representation entirely;
In figure, associated gas pretreatment unit 1, oil removal plant 1.1, dedusting and purifying device 1.2, acid gas removal body device 1.3, dewatering unit 1.4, fractionation by adsorption nitrogen device 1.5, regenerator 2, first condenser 3, gas-liquid separator 4, throttling valve 5, second condenser 6, LNG storage tank 7, variable valve 8.
Embodiment
As shown in Figure 1, the associated gas recovery system that entirely liquefies comprises the associated gas pretreatment unit 1, regenerator 2, first condenser 3, gas-liquid separator 4, throttling valve 5, second condenser 6, LNG storage tank 7, the variable valve 8 that connect in turn, associated gas pretreatment unit 1 comprises the oil removal plant 1.1, dedusting and purifying device 1.2, acid gas removal body device 1.3, dewatering unit 1.4, the fractionation by adsorption nitrogen device 1.5 that connect in turn, the outlet of regenerator 2 lighter hydrocarbons is connected with variable valve 8, and gas-liquid separator 4 bottom is connected with the import of regenerator 2 lighter hydrocarbons.
Described LNG storage tank 7 and the second condenser 6 form loop.The mode that described dedusting and purifying device 1.2 selects cyclonic separator, wire cloth and hollow fiber cartridge to combine according to source of the gas clean level, or only adopt wire cloth and hollow fiber cartridge.
The associated gas recovery method that entirely liquefies is: associated gas, first by oil removal plant 1.1, dedusting and purifying device 1.2, acid gas removal body device 1.3, dewatering unit 1.4, fractionation by adsorption nitrogen device 1.5, departs to fall liquid oil, solid impurity, CO successively 2and H 2s sour gas, water and nitrogen, then the first condenser 3 heat exchange condensation is entered, condensing temperature is-60 DEG C ~-120 DEG C, condensation and separation of lighter hydrocarbons, discharge the cold reclaiming lighter hydrocarbons and realize cold recycling by regenerator 2, enter the second condenser 6 heat exchange condensation after dry gas throttling cooling, condensing temperature is-162 DEG C, and dry gas liquefies and is stored in LNG storage tank 7 in secondary condenser 6.
The cold of described first condenser 3, second condenser 6 by sterlin refrigerator, vascular refrigerator, hot sound refrigerating machine, the small-sized Cryo Refrigerator of G-M refrigerator one or more provide, or cryogen provides; Described dry gas expenditure and pressure is to 0.12-0.13MPa.The cold of two warm areas both can be provided by separate unit dual unit cold, also can be provided by two refrigerators being operated in two warm areas respectively.In order to provide higher cold respectively at two warm areas, multiple stage refrigerator mode in parallel or series connection can be adopted to export cold.

Claims (6)

1. an associated gas liquefies recovery system entirely, it is characterized in that comprising the associated gas pretreatment unit (1) connected in turn, regenerator (2), first condenser (3), gas-liquid separator (4), throttling valve (5), second condenser (6), LNG storage tank (7), variable valve (8), associated gas pretreatment unit (1) comprises the oil removal plant (1.1) connected in turn, dedusting and purifying device (1.2), acid gas removal body device (1.3), dewatering unit (1.4), fractionation by adsorption nitrogen device (1.5), the outlet of regenerator (2) lighter hydrocarbons is connected with variable valve (8), gas-liquid separator (4) bottom is connected with regenerator (2) lighter hydrocarbons import.
2. the system as claimed in claim 1, is characterized in that, described LNG storage tank (7) and the second condenser (6) form loop.
3. the system as claimed in claim 1, it is characterized in that, the mode that described dedusting and purifying device (1.2) selects cyclonic separator, wire cloth and hollow fiber cartridge to combine according to source of the gas clean level, or only adopt wire cloth and hollow fiber cartridge.
4. one kind uses the associated gas of system as claimed in claim 1 entirely to liquefy recovery method, it is characterized in that associated gas first by oil removal plant (1.1), dedusting and purifying device (1.2), acid gas removal body device (1.3), dewatering unit (1.4), fractionation by adsorption nitrogen device (1.5), depart to fall liquid oil, solid impurity, CO successively 2and H 2s sour gas, water and nitrogen, then the first condenser (3) heat exchange condensation is entered, condensing temperature is-60 DEG C ~-120 DEG C, condensation and separation of lighter hydrocarbons, discharge the cold reclaiming lighter hydrocarbons and realize cold recycling by regenerator (2), enter the second condenser (6) heat exchange condensation after dry gas throttling cooling, condensing temperature is-162 DEG C, and dry gas liquefies and is stored in LNG storage tank (7) in secondary condenser (6).
5. method as claimed in claim 4, it is characterized in that, the cold of described first condenser (3), the second condenser (6) by sterlin refrigerator, vascular refrigerator, hot sound refrigerating machine, the small-sized Cryo Refrigerator of G-M refrigerator one or more provide, or cryogen provides.
6. method as claimed in claim 4, it is characterized in that, described dry gas expenditure and pressure is to 0.12-0.13MPa.
CN201510156325.3A 2015-04-03 2015-04-03 Oilfield associated gas complete liquefaction recovery system and method thereof Pending CN104845692A (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106190387A (en) * 2016-08-30 2016-12-07 山东恒业石油新技术应用有限公司 A kind of novel oilfield associated gas denitrification equipment and technique
CN106753632A (en) * 2016-11-16 2017-05-31 深圳市燃气集团股份有限公司 A kind of small-sized well head natural gas purification method of purification and device
CN109370671A (en) * 2018-11-20 2019-02-22 杭州勃扬能源设备有限公司 A kind of oil field gas separating technology
CN110452730A (en) * 2019-09-02 2019-11-15 上海优华系统集成技术股份有限公司 The recovery system and its method of heavy constituent in lighter hydrocarbons dry gas
CN110513598A (en) * 2019-08-06 2019-11-29 中国石油天然气股份有限公司 Oil well field associated gas closed pressurization gathering and transportation system and use method thereof
CN111895680A (en) * 2020-07-15 2020-11-06 广州市华达石化有限公司 Production control method adopting liquid carbon dioxide for refrigeration
CN112226259A (en) * 2020-10-20 2021-01-15 中海石油(中国)有限公司 High-efficient compact marine oil field associated gas recycle device
CN112370813A (en) * 2020-12-07 2021-02-19 上海焱晶燃烧设备检测有限公司 Gas-liquid separation and condensate treatment device

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CN102206520A (en) * 2011-04-21 2011-10-05 北京工业大学 Direct expansion type liquefaction method and device for natural gas
CN103712412A (en) * 2012-10-09 2014-04-09 陈敏 Mixed cooling agent based natural gas liquefaction technology
CN103727388A (en) * 2012-10-11 2014-04-16 刘友利 Novel natural gas transportation technology
CN104471334A (en) * 2012-07-17 2015-03-25 塞佩姆股份公司 Method for liquefying a natural gas, including a phase change
CN204589118U (en) * 2015-04-03 2015-08-26 浙江大学 A kind of associated gas liquefies recovery system entirely

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CN1164890A (en) * 1994-11-08 1997-11-12 威廉斯菲尔德服务公司 LNG production in cryogenic natural gas processing plants
GB2357140A (en) * 1999-05-13 2001-06-13 Kvaerner Oil & Gas As Purification and liquefaction of natural gas.
CN1615422A (en) * 2002-01-18 2005-05-11 Bp北美公司 Integrated processing of natural gas into liquid products
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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106190387A (en) * 2016-08-30 2016-12-07 山东恒业石油新技术应用有限公司 A kind of novel oilfield associated gas denitrification equipment and technique
CN106190387B (en) * 2016-08-30 2019-10-11 山东恒业石油新技术应用有限公司 A kind of associated gas denitrification equipment and technique
CN106753632A (en) * 2016-11-16 2017-05-31 深圳市燃气集团股份有限公司 A kind of small-sized well head natural gas purification method of purification and device
CN109370671A (en) * 2018-11-20 2019-02-22 杭州勃扬能源设备有限公司 A kind of oil field gas separating technology
CN110513598A (en) * 2019-08-06 2019-11-29 中国石油天然气股份有限公司 Oil well field associated gas closed pressurization gathering and transportation system and use method thereof
CN110452730A (en) * 2019-09-02 2019-11-15 上海优华系统集成技术股份有限公司 The recovery system and its method of heavy constituent in lighter hydrocarbons dry gas
CN110452730B (en) * 2019-09-02 2021-08-06 上海优华系统集成技术股份有限公司 System and method for recovering heavy components in light hydrocarbon dry gas
CN111895680A (en) * 2020-07-15 2020-11-06 广州市华达石化有限公司 Production control method adopting liquid carbon dioxide for refrigeration
CN111895680B (en) * 2020-07-15 2021-09-03 广州市华达石化有限公司 Production control method adopting liquid carbon dioxide for refrigeration
CN112226259A (en) * 2020-10-20 2021-01-15 中海石油(中国)有限公司 High-efficient compact marine oil field associated gas recycle device
CN112370813A (en) * 2020-12-07 2021-02-19 上海焱晶燃烧设备检测有限公司 Gas-liquid separation and condensate treatment device

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Application publication date: 20150819