EP2735696A1 - Procédé et système pour améliorer la production de gaz naturel - Google Patents

Procédé et système pour améliorer la production de gaz naturel Download PDF

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Publication number
EP2735696A1
EP2735696A1 EP12194472.2A EP12194472A EP2735696A1 EP 2735696 A1 EP2735696 A1 EP 2735696A1 EP 12194472 A EP12194472 A EP 12194472A EP 2735696 A1 EP2735696 A1 EP 2735696A1
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EP
European Patent Office
Prior art keywords
formation
gas
natural gas
nitrogen
corrosive
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP12194472.2A
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German (de)
English (en)
Inventor
Friedrich Christoph Seeberger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shell Internationale Research Maatschappij BV
Original Assignee
Shell Internationale Research Maatschappij BV
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 Internationale Research Maatschappij BV filed Critical Shell Internationale Research Maatschappij BV
Priority to EP12194472.2A priority Critical patent/EP2735696A1/fr
Publication of EP2735696A1 publication Critical patent/EP2735696A1/fr
Withdrawn legal-status Critical Current

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    • 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
    • E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
    • E21B43/166—Injecting a gaseous medium; Injecting a gaseous medium and a liquid medium
    • E21B43/168—Injecting a gaseous medium

Definitions

  • the invention relates to a method and system for enhancing natural gas production from an underground natural gas containing formation.
  • the formation may be a natural gas reservoir, which may be partially depleted, a tight gas reservoir in which natural gas is present in pores of a substantially impermeable formation, a water reservoir containing residual natural gas or a capped permeable formation into which natural gas is injected for storage and use during peak periods of natural gas consumption.
  • US patent 4,765,407 discloses a method for enhancing production of gas condensates from a gas condensate reservoir by injecting a mixture of carbon dioxide and nitrogen obtained from a Claus plant into the reservoir.
  • a disadvantage of this known injection technology is that a mixture of carbon dioxide and nitrogen is corrosive and will induce corrosion of corrosion prone fluid injection and production facilities.
  • Canadian patent application CA 2568358 discloses a method for fracturing a hydrate or shale oil containing formation by injecting liquid nitrogen into the formation.
  • a limitation of the known nitrogen injection technologies is that they are either configured to enhance production from gas condensate, hydrate and/or shale oil containing formations or from tight reservoirs by fracturing and that they are not configured to enhance natural gas production from a natural gas or residual gas reservoirs by displacing gas.
  • a method for enhancing natural gas production from an underground natural gas containing formation comprising injecting non-corrosive Nitrogen containing drive gas into the formation during a period of at least several months, during at least part of which period natural gas is produced from the formation.
  • the non-corrosive Nitrogen containing drive gas may be injected a) into a natural gas containing formation which is an at least partly depleted gas reservoir and which may have been invaded by water through the expansion of a connected aquifer and thereby leaving residual gas in the original gas reservoir, b)into an aquifer, which may contain residual gas below the original Free Water Level (FWL)and which is connected to a gas reservoir and c) into an aquifer containing residual gas, which it is not connected to a gas reservoir.
  • N2 may be injected below or above a natural fracturing pressure gradient. Fracturing here is temporary as a consequence of high injection pressure and fracturing will cease until the injection pressure is lowered or injection stops.
  • the permeable underground formation layer may be tilted and have an upper and a lower edge and the Nitrogen containing drive gas may be injected into the formation in the vicinity of the lower edge of the tilted permeable underground formation layer.
  • the natural gas containing formation may not contain a substantial amount of associated natural gas associated to crude oil, natural gas in a gas cap above an oil reservoir, crude oil and/or high amounts of retrograde condensates that drop out in the formation.
  • a slug of corrosive drive gas comprising Carbon Dioxide and/or flue gases may be injected into the reservoir, wherein the slug of Nitrogen containing drive gas may have such a volume that it provides in the reservoir a barrier between the slug of corrosive drive gas and the natural gas, which barrier inhibits mixing of the corrosive drive gas with the natural gas and inhibits the corrosive drive gas to reach natural gas production wells and other natural gas production facilities during the production of natural gas via these wells and facilities.
  • a slug of any type of other drive non-corrosive gas or gas mixture or water may be injected into the formation prior to injecting the corrosive drive gas.
  • a system for enhancing natural gas production from an underground natural gas containing formation comprising at least one injection well through which non-corrosive Nitrogen containing drive gas is injected into the formation during a period of at least several months and at least one production well through which natural gas is produced during at least part of said period.
  • the Nitrogen containing drive gas may be obtained from an Air Separation Unit(ASU) that separates the air into streams of nitrogen, oxygen and/or oxygen enriched air and that supplies the oxygen and/or oxygen enriched air to an industrial plant, which may be a power plant in which in a mixture of fuel and oxygen or oxygen enriched air is combusted to generate electrical energy and to generate flue gases which contain Carbon Dioxide that may be injected after a slug of Nitrogen containing drive gas into the formation in accordance with an optional embodiment of the method according to the invention.
  • the injected Nitrogen containing drive gas provides a barrier that inhibits corrosive drive gas containing Carbon Dioxide or any other non-inert or hazardous drive gas to reach the natural gas production facilities.
  • Figure 1 shows how Nitrogen (N 2 ) is separated from oxygen (O 2 ) in an Air Separation Unit(ASU)(1) of a power plant (2) that generates electrical energy (3) by combusting fuel using Oxygen(O 2 ) or an Oxygen enriched air mixture.
  • the generated Nitrogen (N2) is subsequently pumped by a compressor (4) into a nitrogen supply conduit (5) that is connected to one or more Nitrogen injections wells 22, 31A-D as shown in Figures 2A-D and 3 .
  • FIGs 2A-2D schematically show how Nitrogen (N 2 ) that may be generated by the ASU (1) shown in Figure 1 is injected as an inert, non-corrosive drive gas into an underground gas reservoir formation 20 to perform a Nitrogen Assisted Depletion Drive (NADD)or the Nitrogen Enhanced Residual Gas (NERG)process according to the invention.
  • NADD Nitrogen Assisted Depletion Drive
  • NNERG Nitrogen Enhanced Residual Gas
  • the underground gas reservoir is located in a permeable gas bearing formation layer, also known as the reservoir formation 20, which is located underneath an impermeable cap layer 21 that traps the natural gas within the reservoir formation 20 and the Nitrogen (N 2 ) is injected via a Nitrogen injection well 22 into a part of the reservoir formation 20 at a distance to the production well at 20A of the reservoir formation 20 whilst natural gas (comprising CH 4 and other constituents)is produced via a natural gas production well 23.
  • a permeable gas bearing formation layer also known as the reservoir formation 20
  • the Nitrogen N 2
  • Natural gas comprising CH 4 and other constituents
  • the reservoir formation 20 only comprises a minor fraction of water which is dispersed in the pores of a tilted formation layer, so that there is no water accumulation in this part of the reservoir formation 20.
  • the Nitrogen (N2) is injected into the water layer 24 to stimulate migration of natural gas (CH 4 ) from the water layer 24 and to enhance flux of natural gas (CH 4 ) through the reservoir formation 20 to the natural gas production well 23.
  • Figure 2C schematically shows how natural gas (CH 4 ) has been partly separated from the pores near the lower edge 20A of the reservoir formation 20 and pore water reaches the production well 23 leaving trapped or residual gas behind.
  • Figure 2D schematically shows an embodiment where the pores of substantially the entire reservoir formation 20 are filled with a water-gas mixture comprising pore water and Natural Gas (CH4), which mixture is stimulated to flow into the production well 23 by injecting Nitrogen into the injection well 22 near the lower edge of the reservoir formation 20.
  • a water-gas mixture comprising pore water and Natural Gas (CH4)
  • Figure 3 schematically shows how production of Natural Gas (CH 4 ) from a tight gas reservoir or residual gas formation 30 is enhanced by yet another embodiment of the Nitrogen Assisted Depletion Drive (NADD) or Nitrogen Enhanced Residual Gas (NERG) process according to the invention wherein Nitrogen is injected into possibly several Nitrogen injection wells 31A-D and natural gas (CH4) is produced via possibly several production wells 32A-D traversing the tight gas formation 30.
  • NADD Nitrogen Assisted Depletion Drive
  • NERG Nitrogen Enhanced Residual Gas

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Gas Separation By Absorption (AREA)
EP12194472.2A 2012-11-27 2012-11-27 Procédé et système pour améliorer la production de gaz naturel Withdrawn EP2735696A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP12194472.2A EP2735696A1 (fr) 2012-11-27 2012-11-27 Procédé et système pour améliorer la production de gaz naturel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP12194472.2A EP2735696A1 (fr) 2012-11-27 2012-11-27 Procédé et système pour améliorer la production de gaz naturel

Publications (1)

Publication Number Publication Date
EP2735696A1 true EP2735696A1 (fr) 2014-05-28

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EP12194472.2A Withdrawn EP2735696A1 (fr) 2012-11-27 2012-11-27 Procédé et système pour améliorer la production de gaz naturel

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EP (1) EP2735696A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115758936A (zh) * 2022-11-23 2023-03-07 西南石油大学 一种考虑水溶气的枯竭气藏储气库潜力评价模型及方法

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4393936A (en) * 1981-09-21 1983-07-19 Union Oil Company Of California Method for the enhanced recovery of oil and natural gas
US4434852A (en) * 1981-08-31 1984-03-06 Texaco Inc. Method of enhanced oil recovery employing nitrogen injection
US4635721A (en) * 1983-11-29 1987-01-13 Amoco Corporation Method of displacing fluids within a gas-condensate reservoir
US4765407A (en) 1986-08-28 1988-08-23 Amoco Corporation Method of producing gas condensate and other reservoirs
US5388645A (en) * 1993-11-03 1995-02-14 Amoco Corporation Method for producing methane-containing gaseous mixtures
WO2002103157A1 (fr) * 2001-06-15 2002-12-27 The Petroleum Oil And Gas Corporation Of South Africa (Proprietary) Limited Procede d'extraction d'hydrocarbures dans un reservoir d'hydrocarbures bruts
US20050167103A1 (en) * 2003-10-06 2005-08-04 Horner W. N. Applications of waste gas injection into natural gas reservoirs
CA2568358A1 (fr) 2006-11-17 2008-05-17 James Q. Maguire Methode de production in situ de petrole et de gaz (methane), a terre et au large
US7481275B2 (en) * 2002-12-13 2009-01-27 Statoil Asa Plant and a method for increased oil recovery
WO2012021282A1 (fr) 2010-08-09 2012-02-16 Conocophillips Company Procédé pour la perméabilité accrue d'hydrate gazeux

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4434852A (en) * 1981-08-31 1984-03-06 Texaco Inc. Method of enhanced oil recovery employing nitrogen injection
US4393936A (en) * 1981-09-21 1983-07-19 Union Oil Company Of California Method for the enhanced recovery of oil and natural gas
US4635721A (en) * 1983-11-29 1987-01-13 Amoco Corporation Method of displacing fluids within a gas-condensate reservoir
US4765407A (en) 1986-08-28 1988-08-23 Amoco Corporation Method of producing gas condensate and other reservoirs
US5388645A (en) * 1993-11-03 1995-02-14 Amoco Corporation Method for producing methane-containing gaseous mixtures
WO2002103157A1 (fr) * 2001-06-15 2002-12-27 The Petroleum Oil And Gas Corporation Of South Africa (Proprietary) Limited Procede d'extraction d'hydrocarbures dans un reservoir d'hydrocarbures bruts
US7481275B2 (en) * 2002-12-13 2009-01-27 Statoil Asa Plant and a method for increased oil recovery
US20050167103A1 (en) * 2003-10-06 2005-08-04 Horner W. N. Applications of waste gas injection into natural gas reservoirs
CA2568358A1 (fr) 2006-11-17 2008-05-17 James Q. Maguire Methode de production in situ de petrole et de gaz (methane), a terre et au large
WO2012021282A1 (fr) 2010-08-09 2012-02-16 Conocophillips Company Procédé pour la perméabilité accrue d'hydrate gazeux

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115758936A (zh) * 2022-11-23 2023-03-07 西南石油大学 一种考虑水溶气的枯竭气藏储气库潜力评价模型及方法
CN115758936B (zh) * 2022-11-23 2023-08-15 西南石油大学 一种考虑水溶气的枯竭气藏储气库潜力评价模型及方法

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