# US 2008/0302012 A1 · System for Separating a Waste Liquid from a Produced Gas and Injecting the Waste Liquid into a Well

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- Number: US 2008/0302012 A1
- Document ID: US20080302012A1
- Status: Published application
- Kind: A1
- Application number: 12/196,916
- Filed: 2008-08-22
- Published: 2008-12-11
- Earliest claimed: 2007-02-12
- Inventors: Donald Leo Stinson
- Web page: https://patentgrep.com/patent/US20080302012A1

## CPC

- B01D 53/002: {by condensation}
- B01D 53/1418: {Recovery of products}
- C10L 3/10: Working-up natural gas or synthetic natural gas
- C10L 3/102: {of acid contaminants}
- F25J 3/0209: {Natural gas or substitute natural gas}
- F25J 3/0233: {separation of CnHm with 1 carbon atom or more}
- F25J 3/0257: {separation of nitrogen (from air F25J3/04, production of nitrogen in general C01B21/00)}
- F25J 3/0266: {separation of carbon dioxide (production of carbon dioxide in general C01B32/00)}
- F25J 3/029: {of helium}
- B01D 2256/24: Hydrocarbons
- B01D 2257/304: Hydrogen sulfide
- B01D 2257/504: Carbon dioxide
- F25J 2200/02: in a single pressure main column system
- F25J 2200/30: using a side column in a single pressure column system
- F25J 2200/70: Refluxing the column with a condensed part of the feed stream, i.e. fractionator top is stripped or self-rectified
- F25J 2200/74: Refluxing the column with at least a part of the partially condensed overhead gas
- F25J 2205/04: in the feed line, i.e. upstream of the fractionation step
- F25J 2245/42: the recycled stream being nitrogen
- F25J 2260/80: Integration in an installation using carbon dioxide, e.g. for EOR, sequestration, refrigeration etc.
- F25J 2290/40: Vertical layout or arrangement of cold equipments within in the cold box, e.g. columns, condensers, heat exchangers etc.
- Y02C 20/20: of methane
- Y02C 20/40: of CO2
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)
- C10L: FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G OR C10K; LIQUIFIED PETROLEUM GAS; USE OF ADDITIVES TO FUELS OR FIRES; FIRE-LIGHTERS
- 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 (cryogenic pumps F04B37/08; gas storage vessels, gas holders F17; filing vessels with, or discharging from vessels, compressed, liquefied or solidified gases F17C; refrigeration machines, plants, or systems F25B)}
- Y02C: CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]

## Abstract

Produced natural gas containing carbon dioxide is dehydrated and chilled to liquefy the carbon dioxide and then fractionated to produce a waste stream of liquid carbon dioxide and hydrogen sulfide. Natural gas liquids may be first separated and removed before fractionation. After fractionation, the waste stream is pressurized and transmitted to a remote injection well for injection either for disposal of the waste stream and preferably to urge hydrocarbons toward the producing well. A hydrocarbon stream proceeds from fractionation to a methanol absorber system which removes carbon dioxide gas. The hydrocarbon stream is thereafter separated into at least hydrocarbon gas, nitrogen and helium. Some of the nitrogen is reintroduced into a fractionation tower to enhance the recovery of hydrocarbons. A methanol recovery system is provided to recover and reuse the methanol. The hydrocarbons are sold as natural gas and the helium is recovered and sold. Excess nitrogen is vented.

## Claims

### Claim 1

A process comprising:
obtaining produced gas from a source of produced gas, said produced gas including at least one hydrocarbon gas and at least one waste gas;
supplying an inlet system for dehydrating the produced gas;
supplying a heat exchanger to cool produced gas after dehydration;
supplying a gas processing system for separating gases of the produced gas after cooling;
supplying said produced gas to said inlet system and operating said inlet system to dehydrate the produced gas and form dehydrated produced gas;
supplying said dehydrated produced gas to said heat exchanger to cool said dehydrated produced gas to form at least one waste liquid from at least one waste gas and to form cooled dehydrated produced gas having at least one at least one waste liquid entrained therein;
supplying said cooled dehydrated produced gas with entrained at least one waste liquid to a gas processing system and operating said gas processing system to separate said cooled dehydrated produced gas into at least a hydrocarbon stream and said waste liquid, said hydrocarbon stream including at least carbon dioxide gas and methane and said waste liquid including at least carbon dioxide liquid;
supplying pressurizing means for pressurizing a stream;
operating said pressurizing means to pressurize said waste liquid;
supplying said waste liquid under pressure to an injection well; and
injecting said waste liquid into said injection well.

### Claim 2 (depends on 1)

The process of claim 1 wherein said heat exchanger is positioned next in sequence after said inlet system.

### Claim 3 (depends on 2)

The process of claim 2 wherein said produced gas includes hydrogen sulfide and wherein said processing system is operated so that hydrogen sulfide is included in said waste liquid.

### Claim 4 (depends on 3)

The process of claim 3 further including supplying a methanol removal system with methanol, and wherein said hydrocarbon stream is supplied to said methanol removal system, and wherein said methanol removal system is operated to combine the carbon dioxide gas with the methanol to remove the carbon dioxide gas from said hydrocarbon stream to form a methanol and carbon dioxide liquid.

### Claim 5 (depends on 4)

The process of claim 4 further including supplying a methanol recovery system operable to separate the methanol and carbon dioxide liquid into methanol and carbon dioxide gas, and wherein said methanol and carbon dioxide liquid are supplied to the methanol recovery system, and wherein said methanol recovery system is operated to separate said carbon dioxide from said methanol to form a methanol liquid and carbon dioxide gas, and wherein said methanol recovery system is connected to supply the carbon dioxide gas for combination with the cooled dehydrated production gas being processed.

### Claim 6 (depends on 5)

The process of claim 5 wherein the methanol is supplied to the methanol removal system.