WO2000011314A1 - Method of injecting water and gas - Google Patents
Method of injecting water and gas Download PDFInfo
- Publication number
- WO2000011314A1 WO2000011314A1 PCT/NO1999/000258 NO9900258W WO0011314A1 WO 2000011314 A1 WO2000011314 A1 WO 2000011314A1 NO 9900258 W NO9900258 W NO 9900258W WO 0011314 A1 WO0011314 A1 WO 0011314A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- water
- gas
- injection
- injected
- injection well
- Prior art date
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 76
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000002347 injection Methods 0.000 claims abstract description 55
- 239000007924 injection Substances 0.000 claims abstract description 55
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 23
- 230000004071 biological effect Effects 0.000 abstract description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract description 3
- 239000011707 mineral Substances 0.000 abstract description 3
- 238000001556 precipitation Methods 0.000 abstract description 3
- 150000003839 salts Chemical class 0.000 abstract description 3
- 238000005260 corrosion Methods 0.000 abstract description 2
- 230000007797 corrosion Effects 0.000 abstract description 2
- 239000000126 substance Substances 0.000 abstract description 2
- 230000002401 inhibitory effect Effects 0.000 abstract 1
- 238000005086 pumping Methods 0.000 abstract 1
- 229940090044 injection Drugs 0.000 description 39
- 239000007789 gas Substances 0.000 description 21
- 150000004677 hydrates Chemical class 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B43/162—Injecting fluid from longitudinally spaced locations in injection well
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B43/20—Displacing by water
Definitions
- the invention relates to a method of injecting water and gas, possibly just water, into the petroleum-carrying strata of a subsoil formation.
- An important condition for allowing injection of water and gas is that the water and gas have a pressure exceeding the pressure inside said petroleum-carrying strata.
- An undesirable effect of such elevated pressure is that the gas may form hydrates which will plug the well, so that the injection stops.
- Such plugs of hydrates, especially near the surface represent a considerable safety hazard.
- the formation of hydrates may be avoided through heating of, or by the use of chemicals in, the water to be injected.
- Other drawbacks by the injection of surface water are that the injection water may cause salt or mineral precipitation in the surface equipment, in the injection well or in the formation, and separation of oxygen which creates corrosion problems. Moreover, the injection water may cause undesired biological activity in the formation.
- the main object of the present invention is to provide a method of injecting water and gas, possibly just water, whereby is avoided that the water to be injected has to pass said costly treatment.
- This is achieved by the injection water being recovered from aquifers present in the subsoil formation.
- the water recovered from the subsoil formation is fed directly into the injection well through at least one opening formed in the wall of the well by said aquifer.
- the wa- ter is fed from said opening to the point in the injection well where the water and the gas, possibly just the water, are/is to be injected into the petroleum-carrying strata.
- use is made of water from a source of higher temperature and pressure than what has been common with water sup- plied from the surface.
- Fig. 1 shows a simplified vertical view of an injection well for the injection of water and/or gas
- Fig. 2 shows a schematic vertical sectional view of an injec- tion well with pump and injection pipe for water and gas.
- the present method relates to injection of water and gas, possibly just water, into a subsoil formation 1 carrying petroleum.
- the injection may take place by water and gas being injected simultaneously or alternately, or maybe by just water being injected into the subsoil formation 1.
- the injection of water and gas, possibly just water is realised by means of an injection well 4 which is formed in the subsoil formation 1 and extends at least down into a petroleum- carrying stratum 2 thereof.
- the injection well 4 is prefera- bly formed with a wellhead, and the wellhead comprises, among other things, necessary equipment for supplying the gas to be injected into said petroleum-carrying stratum 2.
- the water to be injected is recovered from an aquifer 3 of the subsoil formation 1, and the water is fed directly into the injection well 4 through at least one opening 5 formed in the wall of the well by said aquifer 3.
- the water is then fed to the point in the injection well 4 where the water and the gas, possibly just the water, are/is to be injected into said petroleum-carrying stratum 2 without having been taken to the surface. This may happen, for example by the water being pumped from the opening 5 to the location in the injection well 4 where the water and the gas, possibly just the water, are/is to be injected.
- a pump 7 is preferably placed close to the opening 5 in the injection well 4.
- the injection well 4 also comprises an injec- tion pipe 6 for gas.
- the injection pipe 6 is passed from the wellhead, where the gas is added, and down into the petroleum-carrying stratum 2 where the water and gas, possibly just the water, are/is to be injected.
- an upper packer 8 and a lower packer 9 isolating the aquifer 3 from the surface, or other strata of the formation 1 such as the petroleum-carrying stratum 2.
- a pump 7 which is positioned in the space between the packers 8, 9, pumps the water into the in- jection pipe 6 and further out into the petroleum-carrying stratum 2.
- the pump 7 may be placed in a pipe socket which is formed on the injection pipe 6, and may be operated electrically or hydraulically .
- At least one check valve 10 is positioned in the injection pipe 6 above the pump 7.
- At least one additional check valve 11 is positioned at the outlet of the pump 7 into the injection pipe 6.
Abstract
The invention relates to a method of injecting water and gas, possibly just water, into a petroleum-carrying stratum (2) of a subsoil formation (1), whereby the water and the gas, possibly just the water, are/is injected by means of an injection well (4) formed in the subsoil formation (1). The object of the invention is to avoid that water which is to be injected, will require treatment by, among other things, the addition of chemicals inhibiting formation of hydrate from the gas, biological activity in the formation (1), precipitation of salts and minerals from the water, corrosion of equipment etc. This is realised by the water to be injected, being taken from aquifers (3) in the subsoil formation (1) and carried directly into the injection well (4) through at least one opening (5) which is formed in the wall of the well by said aquifers (3). Then the water is fed from said opening (5) to the point in the injection well (4) where the water and the gas, possibly just the water, are/is to be injected into said petroleum-carrying stratum (2). The injection well (4) comprises necessary pumping equipment to be used during the injection.
Description
METHOD OF INJECTING WATER AND GAS
The invention relates to a method of injecting water and gas, possibly just water, into the petroleum-carrying strata of a subsoil formation.
People skilled in the art know that it is possible to increase the amount of extractable petroleum of a deposit by injecting water and gas into the petroleum-carrying strata of the subsoil formation. In such cases the injection of water and gas is realised by means of at least one injection well which is formed at a suitable place in the deposit. The injection is done by water and gas being injected either simultaneously or alternately into the subsoil formation. The injection well is normally constructed with a wellhead comprising equipment for the supply of the water an gas to be injected.
An important condition for allowing injection of water and gas, is that the water and gas have a pressure exceeding the pressure inside said petroleum-carrying strata. An undesirable effect of such elevated pressure is that the gas may
form hydrates which will plug the well, so that the injection stops. Such plugs of hydrates, especially near the surface, represent a considerable safety hazard. The formation of hydrates may be avoided through heating of, or by the use of chemicals in, the water to be injected. Other drawbacks by the injection of surface water are that the injection water may cause salt or mineral precipitation in the surface equipment, in the injection well or in the formation, and separation of oxygen which creates corrosion problems. Moreover, the injection water may cause undesired biological activity in the formation. Those are drawbacks which are intensified when injection water from several water sources is used. The last drawbacks may be prevented by thorough treatment of the injection water such as by filtration, removal of oxygen, sulphates etc. The above mentioned heating and treatment of the injection water may result in major additional costs.
The main object of the present invention is to provide a method of injecting water and gas, possibly just water, whereby is avoided that the water to be injected has to pass said costly treatment. This is achieved by the injection water being recovered from aquifers present in the subsoil formation. The water recovered from the subsoil formation is fed directly into the injection well through at least one opening formed in the wall of the well by said aquifer. Then the wa- ter is fed from said opening to the point in the injection well where the water and the gas, possibly just the water, are/is to be injected into the petroleum-carrying strata. Thereby use is made of water from a source of higher temperature and pressure than what has been common with water sup- plied from the surface. Moreover, such water from the formation will be compatible with the water at the site of injection, which enables prevention/reduction of the above
problem of formation of hydrates, precipitation of salts and minerals, separation of oxygen, and biological activity. Other favourable features of the invention will appear from the claims and the following part of the specification.
Referring to the accompanying figures, embodiments of the invention will be explained in further detail, in which
Fig. 1 shows a simplified vertical view of an injection well for the injection of water and/or gas; and
Fig. 2 shows a schematic vertical sectional view of an injec- tion well with pump and injection pipe for water and gas.
As mentioned, the present method relates to injection of water and gas, possibly just water, into a subsoil formation 1 carrying petroleum. The injection may take place by water and gas being injected simultaneously or alternately, or maybe by just water being injected into the subsoil formation 1. The injection of water and gas, possibly just water, is realised by means of an injection well 4 which is formed in the subsoil formation 1 and extends at least down into a petroleum- carrying stratum 2 thereof. The injection well 4 is prefera- bly formed with a wellhead, and the wellhead comprises, among other things, necessary equipment for supplying the gas to be injected into said petroleum-carrying stratum 2.
The water to be injected, is recovered from an aquifer 3 of the subsoil formation 1, and the water is fed directly into the injection well 4 through at least one opening 5 formed in the wall of the well by said aquifer 3. The water is then fed to the point in the injection well 4 where the water and the gas, possibly just the water, are/is to be injected into said
petroleum-carrying stratum 2 without having been taken to the surface. This may happen, for example by the water being pumped from the opening 5 to the location in the injection well 4 where the water and the gas, possibly just the water, are/is to be injected. A pump 7 is preferably placed close to the opening 5 in the injection well 4. To avoid having to extend the injection well 4 downwards, it is the most favourable that the water is extracted from the aquifer 3 located above said petroleum-carrying stratum 2. The opening 5 may, for example, be formed by perforation of the wall of the well and there could also be arranged a sand filter in connection with the opening 5.
In Fig. 2 is shown an example of how the injection well may be configured. The injection well 4 also comprises an injec- tion pipe 6 for gas. The injection pipe 6 is passed from the wellhead, where the gas is added, and down into the petroleum-carrying stratum 2 where the water and gas, possibly just the water, are/is to be injected. In the area by the opening 5, where the water from the aquifer 3 is admitted into the injection well 4, there is placed an upper packer 8 and a lower packer 9 isolating the aquifer 3 from the surface, or other strata of the formation 1 such as the petroleum-carrying stratum 2. A pump 7 which is positioned in the space between the packers 8, 9, pumps the water into the in- jection pipe 6 and further out into the petroleum-carrying stratum 2. The pump 7 may be placed in a pipe socket which is formed on the injection pipe 6, and may be operated electrically or hydraulically . At least one check valve 10 is positioned in the injection pipe 6 above the pump 7. At least one additional check valve 11 is positioned at the outlet of the pump 7 into the injection pipe 6.
Claims
1. A method of injecting water and gas, possibly just water, into a petroleum-carrying stratum (2) of a subsoil formation (1) , whereby water and the gas, possibly just the water, are/is injected by means of an injection well (4) formed in the subsoil formation (1) and extending to said petroleum- carrying stratum (2), c h a r a c t e r i z e d i n that the water to be injected is recovered from an aquifer (3) of the subsoil formation (1) , that the water is carried directly into the injection well (4) through at least one opening (5) formed in the wall of the well by said aquifer (3), and that the water is fed from said opening (5) to the position in the injection well (4) where the water and gas, possibly just the water, are/is to be injected into said petroleum-carrying stratum (2) .
2. A method according to claim 1, c h a r a c t e r i z e d i n that the water is recovered from the aquifer (3) located above and/or below said petroleum-carrying stratum (2) .
3. A method according to claim 2, c h a r a c t e r i z e d i n that the injection well (4) is extended to said lower aquifer (3) .
4. A method according to any one of the preceding claims, c h a r a c t e r i z e d i n that the water is pumped from said opening (5) to the position in the injection well
(4) where the water and the gas, possibly just the water, are/is to be injected into said petroleum-carrying stratum
(2) .
5. A method according to claim 4, c h a r a c t e r i z e d i n that the water is pumped by means of at least one pump (7) preferably positioned in the injection well (4) near said opening (5) in the wall of the well.
6. A method according to any one of the preceding claims, c h a r a c t e r i z e d i n that the gas is supplied at the upper end of the injection well (4) .
7. A method according to any one of the preceding claims, c h a r a c t e r i z e d i n that the water and the gas are supplied simultaneously, possibly alternately, into said petroleum-carrying stratum (2) .
8. A method according to any one of the preceding claims, c h a r a c t e r i z e d i n that the water and the gas, possibly just the water, are/is prevented from entering the aquifer or flowing to the surface, by the provision of at least one check valve (11) between the aquifer (3) and the entrance of an injection pipe (6) provided in the injection well (4), and at least one check valve (10) in the injection pipe (6) , said check valve (10) being provided downstream of a packer (8) in the annulus between the injection pipe (6) and the wall of the well.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0105717A GB2357792B (en) | 1998-08-21 | 1999-08-18 | Method of injecting water and gas |
| AU54521/99A AU5452199A (en) | 1998-08-21 | 1999-08-18 | Method of injecting water and gas |
| US09/785,259 US20010005710A1 (en) | 1998-08-21 | 2001-02-20 | Method of injecting water and gas |
| DK200100282A DK173987B1 (en) | 1998-08-21 | 2001-02-21 | Method of injecting water and gas |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NO19983840 | 1998-08-21 | ||
| NO983840A NO307390B1 (en) | 1998-08-21 | 1998-08-21 | Method of injection of water and gas |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US09/785,259 Continuation US20010005710A1 (en) | 1998-08-21 | 2001-02-20 | Method of injecting water and gas |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2000011314A1 true WO2000011314A1 (en) | 2000-03-02 |
Family
ID=19902340
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/NO1999/000258 WO2000011314A1 (en) | 1998-08-21 | 1999-08-18 | Method of injecting water and gas |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US20010005710A1 (en) |
| AU (1) | AU5452199A (en) |
| DK (1) | DK173987B1 (en) |
| GB (1) | GB2357792B (en) |
| NO (1) | NO307390B1 (en) |
| WO (1) | WO2000011314A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016150961A1 (en) | 2015-03-25 | 2016-09-29 | Vetco Gray Scandinavia As | Injection water pre-treatment and injection system and method |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB0509306D0 (en) | 2005-05-06 | 2005-06-15 | Univ Surrey | Secondary oil recovery |
| CN108071376B (en) * | 2016-11-17 | 2020-10-09 | 中国石油天然气股份有限公司 | Injection and production string in coal-bed gas well |
| CN114382444B (en) * | 2021-12-17 | 2023-10-13 | 中国石油大学(华东) | Combined CO 2 Gas buried natural gas hydrate exploitation system and method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2067234A (en) * | 1980-01-11 | 1981-07-22 | Shell Int Research | Method and means for waterflooding a hydrocarbon fluid containing permeable formation below a body of water |
| US4296810A (en) * | 1980-08-01 | 1981-10-27 | Price Ernest H | Method of producing oil from a formation fluid containing both oil and water |
| US4319635A (en) * | 1980-02-29 | 1982-03-16 | P. H. Jones Hydrogeology, Inc. | Method for enhanced oil recovery by geopressured waterflood |
| EP0201263A1 (en) * | 1985-05-07 | 1986-11-12 | Mobil Oil Corporation | Oil recovery method and waterflooding injection system for use therein |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5697448A (en) * | 1995-11-29 | 1997-12-16 | Johnson; Gordon | Oil well pumping mechanism providing water removal without lifting |
| GB9603067D0 (en) * | 1996-02-14 | 1996-04-10 | Capcis Ltd | Subsea raw water injection facility |
-
1998
- 1998-08-21 NO NO983840A patent/NO307390B1/en not_active IP Right Cessation
-
1999
- 1999-08-18 GB GB0105717A patent/GB2357792B/en not_active Expired - Fee Related
- 1999-08-18 AU AU54521/99A patent/AU5452199A/en not_active Abandoned
- 1999-08-18 WO PCT/NO1999/000258 patent/WO2000011314A1/en active Application Filing
-
2001
- 2001-02-20 US US09/785,259 patent/US20010005710A1/en not_active Abandoned
- 2001-02-21 DK DK200100282A patent/DK173987B1/en not_active IP Right Cessation
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2067234A (en) * | 1980-01-11 | 1981-07-22 | Shell Int Research | Method and means for waterflooding a hydrocarbon fluid containing permeable formation below a body of water |
| US4319635A (en) * | 1980-02-29 | 1982-03-16 | P. H. Jones Hydrogeology, Inc. | Method for enhanced oil recovery by geopressured waterflood |
| US4296810A (en) * | 1980-08-01 | 1981-10-27 | Price Ernest H | Method of producing oil from a formation fluid containing both oil and water |
| EP0201263A1 (en) * | 1985-05-07 | 1986-11-12 | Mobil Oil Corporation | Oil recovery method and waterflooding injection system for use therein |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016150961A1 (en) | 2015-03-25 | 2016-09-29 | Vetco Gray Scandinavia As | Injection water pre-treatment and injection system and method |
| NO339570B1 (en) * | 2015-03-25 | 2017-01-09 | Vetco Gray Scandinavia As | A seawater pre-treatment and injection system and method |
| US20180058185A1 (en) * | 2015-03-25 | 2018-03-01 | Vetco Gray Scandinavia As | Injection water pre-treatment and injection system and method |
| AU2016236247B2 (en) * | 2015-03-25 | 2021-05-13 | Vetco Gray Scandinavia As | Injection water pre-treatment and injection system and method |
| US11131178B2 (en) | 2015-03-25 | 2021-09-28 | Vetco Gray Scandinavia As | Injection water pre-treatment and injection system and method |
Also Published As
| Publication number | Publication date |
|---|---|
| GB0105717D0 (en) | 2001-04-25 |
| DK200100282A (en) | 2001-04-20 |
| GB2357792A (en) | 2001-07-04 |
| GB2357792B (en) | 2003-01-08 |
| NO983840D0 (en) | 1998-08-21 |
| DK173987B1 (en) | 2002-03-25 |
| NO983840L (en) | 2000-02-22 |
| AU5452199A (en) | 2000-03-14 |
| NO307390B1 (en) | 2000-03-27 |
| US20010005710A1 (en) | 2001-06-28 |
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