BRPI1016062A2 - "método para produzir uma corrente de componente de hidrocarboneto gasosa e correntes de componente de hidrocarboneto líquidas, e, aparelho para produzir hidrocarboneto gasoso combinado e correntes de componente de hidrocarboneto líquidas" - Google Patents

"método para produzir uma corrente de componente de hidrocarboneto gasosa e correntes de componente de hidrocarboneto líquidas, e, aparelho para produzir hidrocarboneto gasoso combinado e correntes de componente de hidrocarboneto líquidas"

Info

Publication number
BRPI1016062A2
BRPI1016062A2 BRPI1016062A BRPI1016062A BRPI1016062A2 BR PI1016062 A2 BRPI1016062 A2 BR PI1016062A2 BR PI1016062 A BRPI1016062 A BR PI1016062A BR PI1016062 A BRPI1016062 A BR PI1016062A BR PI1016062 A2 BRPI1016062 A2 BR PI1016062A2
Authority
BR
Brazil
Prior art keywords
hydrocarbon component
producing
streams
liquid hydrocarbon
liquid
Prior art date
Application number
BRPI1016062A
Other languages
English (en)
Inventor
Dirk Willem Van Der Mast
Johan Jan Barend Pek
Willem Dam
Original Assignee
Shell Int Research
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shell Int Research filed Critical Shell Int Research
Publication of BRPI1016062A2 publication Critical patent/BRPI1016062A2/pt
Publication of BRPI1016062B1 publication Critical patent/BRPI1016062B1/pt

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/34—Arrangements for separating materials produced by the well
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/0002—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the fluid to be liquefied
    • F25J1/0022—Hydrocarbons, e.g. natural gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
    • F25J1/0257—Construction and layout of liquefaction equipments, e.g. valves, machines
    • F25J1/0269—Arrangement of liquefaction units or equipments fulfilling the same process step, e.g. multiple "trains" concept
    • F25J1/027—Inter-connecting multiple hot equipments upstream of the cold box
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/0204—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the feed stream
    • F25J3/0209—Natural gas or substitute natural gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/0228—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the separated product stream
    • F25J3/0233—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the separated product stream separation of CnHm with 1 carbon atom or more
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/0228—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the separated product stream
    • F25J3/0238—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the separated product stream separation of CnHm with 2 carbon atoms or more
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/34—Arrangements for separating materials produced by the well
    • E21B43/36—Underwater separating arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2210/00—Processes characterised by the type or other details of the feed stream
    • F25J2210/02—Multiple feed streams, e.g. originating from different sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2220/00—Processes or apparatus involving steps for the removal of impurities
    • F25J2220/60—Separating impurities from natural gas, e.g. mercury, cyclic hydrocarbons
    • F25J2220/64—Separating heavy hydrocarbons, e.g. NGL, LPG, C4+ hydrocarbons or heavy condensates in general
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2230/00—Processes or apparatus involving steps for increasing the pressure of gaseous process streams
    • F25J2230/30—Compression of the feed stream
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2290/00—Other details not covered by groups F25J2200/00 - F25J2280/00
    • F25J2290/50—Arrangement of multiple equipments fulfilling the same process step in parallel

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Geology (AREA)
  • General Engineering & Computer Science (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Separation By Low-Temperature Treatments (AREA)
BRPI1016062 2009-06-02 2010-05-31 Método para produzir uma corrente de componente de hidrocarboneto gasosa e correntes de componente de hidrocarboneto líquidas, e, aparelho para realizar ométodo BRPI1016062B1 (pt)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP09161688A EP2275641A1 (en) 2009-06-02 2009-06-02 Method of producing a combined gaseous hydrocarbon component stream and liquid hydrocarbon component streams, and an apparatus therefor
PCT/EP2010/057513 WO2010139652A1 (en) 2009-06-02 2010-05-31 Method of producing a combined gaseous hydrocarbon component stream and liquid hydrocarbon component streams, and an apparatus therefor

Publications (2)

Publication Number Publication Date
BRPI1016062A2 true BRPI1016062A2 (pt) 2016-05-10
BRPI1016062B1 BRPI1016062B1 (pt) 2019-12-10

Family

ID=41228412

Family Applications (1)

Application Number Title Priority Date Filing Date
BRPI1016062 BRPI1016062B1 (pt) 2009-06-02 2010-05-31 Método para produzir uma corrente de componente de hidrocarboneto gasosa e correntes de componente de hidrocarboneto líquidas, e, aparelho para realizar ométodo

Country Status (11)

Country Link
US (1) US8778052B2 (pt)
EP (2) EP2275641A1 (pt)
JP (1) JP5624612B2 (pt)
KR (1) KR20120014575A (pt)
CN (1) CN102803651A (pt)
AP (1) AP3013A (pt)
AU (1) AU2010255827B2 (pt)
BR (1) BRPI1016062B1 (pt)
CY (1) CY1114610T1 (pt)
RU (1) RU2509208C2 (pt)
WO (1) WO2010139652A1 (pt)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9199898B2 (en) * 2012-08-30 2015-12-01 Chevron U.S.A. Inc. Process, method, and system for removing heavy metals from fluids
BR102015033000B1 (pt) * 2015-12-30 2019-05-07 General Electric Company Sistema e método de separação gás/líquido-líquido submarina
CA3052728A1 (en) * 2017-02-28 2018-09-07 Shell Internationale Research Maatcshappij B.V. Liquid natural gas plant and method of operating thereof
WO2019036278A1 (en) 2017-08-14 2019-02-21 Shell Oil Company BORONIC HYDRATE INHIBITORS
US10619917B2 (en) * 2017-09-13 2020-04-14 Air Products And Chemicals, Inc. Multi-product liquefaction method and system
NO344235B1 (en) * 2018-01-05 2019-10-14 Roxar Software Solutions As Well flow simulation system
NO344474B1 (en) * 2018-06-25 2020-01-13 Fmc Kongsberg Subsea As Subsea compression system and method
KR102336633B1 (ko) * 2020-01-16 2021-12-07 대주지앤아이(주) 충전 후 잔류 수소의 재이용이 가능한 수소충전 시스템
NO20200357A1 (en) 2020-03-26 2021-09-27 Fmc Kongsberg Subsea As Method and subsea system for phased installation of compressor trains
US11261689B2 (en) 2020-07-07 2022-03-01 Halliburton Energy Services, Inc. Subsea autonomous chemical injection system
US12378845B2 (en) * 2022-10-12 2025-08-05 Airburst Technology, Llc System and method for rehabilitating a water well with compressed nitrogen

Family Cites Families (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2970107A (en) * 1955-05-20 1961-01-31 Phillips Petroleum Co Stabilization of oil well fluid
US2937140A (en) * 1956-07-19 1960-05-17 Phillips Petroleum Co Treatment of petroleum well effluents
SU601535A1 (ru) * 1976-04-15 1978-04-05 Всесоюзное Научно-Производственное Объединение "Союзтурбогаз" Установка дл низкотемпературной обработки природного газа
US4626237A (en) * 1984-12-10 1986-12-02 Exxon Production Research Co. Method and apparatus for separating the components of a wellstream
GB2186283A (en) * 1986-02-10 1987-08-12 Humphreys & Glasgow Ltd Treatment of oil
US4778443A (en) * 1987-03-25 1988-10-18 Fluor Corporation Gas-oil-water separation system and process
SU1707189A1 (ru) * 1989-01-17 1992-01-23 Нижневартовский научно-исследовательский и проектный институт нефтяной промышленности Способ газлифтной эксплуатации скважин
RU1794178C (ru) * 1991-02-18 1993-02-07 Татарский Государственный Научно-Исследовательский И Проектный Институт Нефтяной Промышленности Установка подготовки сероводородсодержащей нефти
GB9115095D0 (en) 1991-07-12 1991-08-28 Shell Int Research A method for preventing or retarding the formation of hydrates
US5600044A (en) * 1994-09-15 1997-02-04 Exxon Production Research Company Method for inhibiting hydrate formation
US5583273A (en) * 1994-09-15 1996-12-10 Exxon Production Research Company Method for inhibiting hydrate formation
FR2735210B1 (fr) * 1995-06-06 1997-07-18 Inst Francais Du Petrole Procede de recyclage d'un additif dispersant utilise pour le transport d'un gaz a condensat ou d'un petrole avec gaz associe en presence d'hydrates
NO304564B1 (no) * 1996-10-22 1999-01-11 Norske Stats Oljeselskap FremgangsmÕte for Õ behandle en ikke-stabilisert rÕolje
NO992278L (no) * 1999-05-11 2000-11-13 Rf Procom As FremgangsmÕte for forhindring av tilstopping rørledninger med gasshydrater
BR0109886B1 (pt) 2000-04-07 2011-10-04 método para inibir a obstrução de um conduto.
CN100404946C (zh) * 2004-10-09 2008-07-23 石油大学(北京) 油-气-水混合体系中的水合物动态控制方法
DE602006016475D1 (de) 2005-11-28 2010-10-07 Shell Int Research Verfahren zum empfang von fluid aus einem erdgasrohr
US7770651B2 (en) * 2007-02-13 2010-08-10 Kellogg Brown & Root Llc Method and apparatus for sub-sea processing

Also Published As

Publication number Publication date
RU2509208C2 (ru) 2014-03-10
JP2012528964A (ja) 2012-11-15
AU2010255827A1 (en) 2011-12-01
CN102803651A (zh) 2012-11-28
RU2011153203A (ru) 2013-07-20
AP3013A (en) 2014-10-31
JP5624612B2 (ja) 2014-11-12
US20120118008A1 (en) 2012-05-17
BRPI1016062B1 (pt) 2019-12-10
WO2010139652A1 (en) 2010-12-09
AU2010255827B2 (en) 2013-10-10
EP2275641A1 (en) 2011-01-19
AP2011005968A0 (en) 2011-12-31
CY1114610T1 (el) 2016-10-05
KR20120014575A (ko) 2012-02-17
EP2438267A1 (en) 2012-04-11
US8778052B2 (en) 2014-07-15
EP2438267B1 (en) 2013-10-02

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Legal Events

Date Code Title Description
B06F Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]
B06T Formal requirements before examination [chapter 6.20 patent gazette]
B09A Decision: intention to grant [chapter 9.1 patent gazette]
B16A Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]

Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 31/05/2010, OBSERVADAS AS CONDICOES LEGAIS. (CO) 20 (VINTE) ANOS CONTADOS A PARTIR DE 31/05/2010, OBSERVADAS AS CONDICOES LEGAIS

B21F Lapse acc. art. 78, item iv - on non-payment of the annual fees in time

Free format text: REFERENTE A 15A ANUIDADE.

B21H Decision of lapse of a patent or of a certificate of addition of invention cancelled [chapter 21.8 patent gazette]

Free format text: ANULADA A PUBLICACAO CODIGO 21.6 NA RPI NO 2830 DE 01/04/2025 POR TER SIDO INDEVIDA.