Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
  • B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
  • B01D53/1493—Selection of liquid materials for use as absorbents
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
  • B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
  • B01D53/1456—Removing acid components
  • B01D53/1468—Removing hydrogen sulfide
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
  • C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
  • C10L3/06—Natural gas; Synthetic natural gas obtained by processes not covered by C10G, C10K3/02 or C10K3/04
  • C10L3/10—Working-up natural gas or synthetic natural gas
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
  • C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
  • C10L3/06—Natural gas; Synthetic natural gas obtained by processes not covered by C10G, C10K3/02 or C10K3/04
  • C10L3/10—Working-up natural gas or synthetic natural gas
  • C10L3/101—Removal of contaminants
  • C10L3/102—Removal of contaminants of acid contaminants
• • 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
  • E21B43/40—Separation associated with re-injection of separated materials

Definitions

• the invention relates to a process for the depletion of hydrogen sulfide in natural gas.
• natural gas In the extraction of oil sometimes large quantities of natural gas are also recovered, which may have a significant amount of hydrogen sulfide H 2 S, often is about the H 2 S content at 5%, sometimes even over 20%, each based on standard volumes.
• This crude gas is dissolved under the pressure prevailing in producing high pressure in crude oil. During the extraction, subsequent transport and processing of the crude oil, this raw gas is extracted from the crude oil.
• H 2 S is a highly toxic respiratory poison for humans, animals and plants.
• H 2 S is a highly toxic respiratory poison for humans, animals and plants.
• leaks or accidents given the usual large production volumes from a borehole, such a significant amount of highly toxic H 2 S could quickly leak into the environment, leading to significant damage to personnel and the environment, and immediately ceasing to produce oil would.
• the object of the invention is therefore to provide a safe and very compact method available, with a significant depletion of H 2 S can be performed from natural gas at the site of promotion, continue to be safe and robust in the design and In addition, a secure whereabouts of H 2 S guaranteed.
• the invention solves this problem according to the main claim by
• the high-pressure, crude crude oil-natural gas mixture is initially expanded to a pressure of 70 to 130 bar, preferably 90 bar,
• the outgassed raw gas is subjected to a gas scrubbing after the cooling without further measures of pressure release, which absorbs a large part of the H 2 S contained in the raw gas by means of a physically acting solvent and cleans the raw gas in this way,
• the charged solvent is passed into at least one pressure release stage,
• the supplied solvent is supplied with the heat which has been removed during the cooling of the raw gas, the hydrogenated out H 2 S is allowed to outgas from the solvent,
• the crude oil expanded to 70 to 130 bar is expanded to a pressure of 20 to 40 bar, preferably 30 bar, and the outgassing further, H 2 S-rich raw gas is separated from the crude oil, • to 20 to 40 bar relaxed crude oil to a pressure of 2 to 15 bar, preferably 10 bar, depressurized, thereby separating outgassing further crude gas from the crude oil,
• the condensed liquid phase to the same pressure of 20 to 40 bar, preferably 30 bar is relaxed, such as the crude oil, wherein the resulting gas phase with the ausgasenden from the crude gas phase and the remaining liquid phase are merged with the crude oil.
• this can be done by clamping both the crude oil and the withdrawn liquid phase into the same degassing vessel.
• a third embodiment of the method according to the invention is subjected to the cooling of the outgassed from the crude gas crude gas condensing, liquid phase of a throttling in which it completely evaporated and cools according to the Joule-Thomson effect, the resulting cold is used for cooling the regenerated solvent, and the H 2 S-containing gas stream after compression combined with the other H 2 S-containing gas streams.
• the auskondensierende liquid phase before being treated with it as described above, be previously subjected to a treatment for H 2 S enrichment.
• the withdrawn after cooling of the raw gas, liquid phase is slightly increased by a pump in the pressure, this liquid phase is then fed to a preheater, which it to about 70 0 C. warms up, forming a two-phase system and mainly volatile hydrocarbons are released as gas phase, this gas phase is returned to the raw gas before the raw gas cooler and the remaining liquid phase is enriched accordingly in H 2 S content.
• the slight pressure increase must be only so great that it compensates for the pressure losses occurring, so that the resulting gas phase can be recycled before the raw gas cooler.
• the last solvent pressure relief stage is designed and operated as a low-pressure stripping column and used purified natural gas as the stripping gas.
• N-formylmorpholine N-formylmorpholine
• NAM N-acetylmorpholine
• the oxygen gas scrubbing process can be used in a similar manner as described there, but no high demands must be placed on the purity of the product gas and thus the regeneration of the solvent.
• a suitable place of use is, for example, an oil rig.
• a washing process with a physical solvent has the advantage over other methods that it manages with a very low detergent circulation and can be built very compactly. Sensitive parts such as thin membranes or the like are not used. Through the use of pressure Reductions for the regeneration of the solvent no external regeneration energy, such as steam, is required, which leads to an even more compact design and is an advantage of the invention.
• FIG. 1 shows a block flow diagram of the method installed on an oil rig, wherein the valves shown are for devices for pressure reduction, but which can also be designed as reverse-running pumps and compressors (expander).
• crude crude crude oil mixture 1 is relaxed to 95 bar in the Hochdruckabscheider 2, where form under cooling 2 phases, a liquid crude oil phase and a gaseous crude gas phase.
• these two phases are separated from each other.
• the gas phase is cooled to about 10 ° C as raw gas 3 in the raw gas cooler 4, which can also be designed in several stages. In this case, a liquid phase 5 condenses out.
• the cooled crude gas 6 is then washed in the scrubber 7 with the detergent 8, wherein most of the H 2 S present in the raw gas is absorbed in the detergent.
• the pre-cleaned natural gas 9 leaves the scrubber 7 and is piped to an external natural gas treatment station where a specification-compliant natural gas is produced.
• the loaded with H 2 S, saturated detergent 10 is relaxed in several stages, this heated in the heater 11, which is connected to the radiator 4, whereby the solubility of the H 2 S is reduced, whereupon H 2 S from the heated detergent 12 in the Niederbuchstrippkolonne 13 by means of at least partially purified natural gas 14, which can be withdrawn, for example, from the pre-purified natural gas 9, at ambient pressure in an advantageous manner is particularly largely stripped.
• the seasoned detergent 15 is cooled to the use temperature in the detergent cooler 16 and returned to the scrubber 7.
• the high-pressure crude oil 17 obtained from the high-pressure separator 2 is expanded to 30 bar in the medium-pressure separator 18, with further dissolved gas constituents being outgassed from the crude oil and discharged as medium-pressure raw gas 19.
• the middle pressure crude oil 20 removed from the medium-pressure separator 18 is further expanded to 9 bar in the low-pressure separator 21, with further dissolved gas components outgassing the crude oil and being discharged as low-pressure raw gas 22.
• the low-pressure crude oil 23 from the low-pressure separator 21 is conveyed via pipeline or by ship to an external refinery, where further processing takes place.
• the exhaust gas 24 leaving the low-pressure stripping column 13 is compressed in the exhaust gas compressor 25 to the pressure of the low-pressure raw gas and combined with the low-pressure crude gas 22. If - not shown here - further H 2 S-containing gas flows incurred, for example, behind the depressurization to which the saturated detergent is subjected, or the relaxed and vaporized condensate 5, these streams can also here, or before the exhaust gas compressor 24, when the pressure otherwise not enough, to be involved.
• the low-pressure sour gas 26 is brought in the low-pressure compressor 27 to the pressure level of the medium-pressure separator 18 and brought together after cooling in the medium-pressure cooler 28 with the medium-pressure crude gas 19.
• the merged medium-pressure sour gas 29 is then compressed in the high-pressure compressor 30 on storage pressure-layer and fed into the oil reservoir 31.
• the cooled in the raw gas cooler 4 to about 10 0 C, condensed, liquid phase 5 is divided into 2 partial streams.
• the one partial stream 32 is passed to the crude oil deposit 33, wherein was dispensed with the representation of the pump.
• the other partial flow 34 is slightly increased in its pressure by means of the feed pump 35 and heated in the reheater 36 to 70 0 C.
• phase separation 37 the outgassing gas phase and the remaining liquid phase are separated from each other.
• the liquid phase 38 is expanded to the pressure of the medium-pressure separator 18 and fed into the medium-pressure separator 18.
• the gas phase 39 is admixed with the raw gas 3.

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• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Oil, Petroleum & Natural Gas (AREA)
• Chemical Kinetics & Catalysis (AREA)
• General Chemical & Material Sciences (AREA)
• Analytical Chemistry (AREA)
• Life Sciences & Earth Sciences (AREA)
• Organic Chemistry (AREA)
• Geology (AREA)
• Mining & Mineral Resources (AREA)
• Fluid Mechanics (AREA)
• Geochemistry & Mineralogy (AREA)
• General Life Sciences & Earth Sciences (AREA)
• Physics & Mathematics (AREA)
• Environmental & Geological Engineering (AREA)
• Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
• Gas Separation By Absorption (AREA)
• Treating Waste Gases (AREA)

Applications Claiming Priority (2)

Publications (1)

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• 2005
  • 2005-06-03 DE DE102005025958A patent/DE102005025958A1/de not_active Ceased
• 2006
  • 2006-05-24 EP EP06753820A patent/EP1888720A2/de not_active Withdrawn
  • 2006-05-24 US US11/921,197 patent/US8361201B2/en not_active Expired - Fee Related
  • 2006-05-24 CA CA2609769A patent/CA2609769C/en not_active Expired - Fee Related
  • 2006-05-24 WO PCT/EP2006/004917 patent/WO2006128619A2/de active Application Filing
• 2008
  • 2008-01-02 NO NO20080013A patent/NO20080013L/no not_active Application Discontinuation

Non-Patent Citations (1)

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