CA2073577A1 - Method for preventing or retarding the formation of hydrates - Google Patents
Method for preventing or retarding the formation of hydratesInfo
- Publication number
- CA2073577A1 CA2073577A1 CA002073577A CA2073577A CA2073577A1 CA 2073577 A1 CA2073577 A1 CA 2073577A1 CA 002073577 A CA002073577 A CA 002073577A CA 2073577 A CA2073577 A CA 2073577A CA 2073577 A1 CA2073577 A1 CA 2073577A1
- Authority
- CA
- Canada
- Prior art keywords
- hydrates
- glycoside
- formation
- alkyl
- fluid
- 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.)
- Abandoned
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/22—Hydrates inhibition by using well treatment fluids containing inhibitors of hydrate formers
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Saccharide Compounds (AREA)
- Pipeline Systems (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
A B S T R A C T
A METHOD FOR PREVENTING OR RETARDING THE FORMATION OF HYDRATES
The invention relates to a method for preventing or retarding the formation of hydrates or for reducing the tendency of hydrates to agglomerate, during the transport of a fluid comprising water and hydrocarbon, through a conduit, which method comprises adding to the fluid an alkyl glycoside.
A METHOD FOR PREVENTING OR RETARDING THE FORMATION OF HYDRATES
The invention relates to a method for preventing or retarding the formation of hydrates or for reducing the tendency of hydrates to agglomerate, during the transport of a fluid comprising water and hydrocarbon, through a conduit, which method comprises adding to the fluid an alkyl glycoside.
Description
2~73~7~
A METHOD FOR PREVENTING OR RETARDING THE FORMATIO~ OF HYDRATES
The invention relates to a method for preventing or retarding the formation of hydrates or for reducing the tendency of hydrates to agglomerate during the transport of a fluid through a conduit.
It is well known in the art that the formation of hydrates in a conduit, e.g. a pipeline, during the transport of oil and gas is a serious problem, especially in areas with a low temperature in the winter season or in the sea. Generally the temperatures are so low that hydrate formation, due to the inevitable presence of co-produced water in the wells takes place, if no special steps are taken. Insulation decreases the chance of hydrate formation, but is expensive. If the field is relatively small and at long distance from the production platform the costs of insulation are too high to make the field economically attractive.
It is known to add anti-freeze compounds, like glycol or methanol, during transport. A disadvantage, however, is that large quantities of these compounds are required.
There has now been found a new group of compounds, the alkyl glycosides which have not this disadvantage, since they may be used in very small quantities which do not need to be recovered.
Moreover, these compounds change the crystal morphology of the hydrates in an advantageous manner.
The invention relates to a method for preventing or retarding the formation of hydrates or for reducing the tendency of hydrates to agglomerate, during the transport of a fluid comprising water and hydrocarbon, through a conduct, which method comprises adding to the fluid an alkyl glycoside.
The fluid may be a liquid or a gas, but is preferably a gas such as methane, ethane, propane, butane or isobutane. The fluid may be originated with oil wells as well as gas wells. The source may also produce natural gas.
2073~)77 Depending upon the pressure hydrates may be formed at temperatures well above the freezing point of water. Ethane hydrates, for example, are formed at pressures be-tween 10 and 30 bar ~1 and 3 MPa) and temperatures between 4 ~C and 14 C.
Formation an~ agglomeration of hydrate crystals will thus easily occur in pipelines in a cold atmosphere. Formation of hydrate crystals as well as agglomeration are not limited to gas wells, but occur also in oil wells, if water and gas are present in the fluid.
The alkyl glycosides, used in the process according to the invention have been discussed in Kirk-Othmer, ~ncyclopedia of Chemical Technology, 1951, under the heading "Glycosides", Volume 7, pages 263-273.
Alcohols conjugated with reducing sugars form alkyl glycosides, e.g. alkyl ~-D-glucopyranoside:
H H OH H H
OH H OH OR
- ~ , in which R represents the alkyl group and the linkage is through the anomeric carbon atom of the sugar radical.
The term glycoside is generic and the presence of a particular sugar residue is indicated by the appropriate term, as glucoside, galactoside, fructoside, etc.
The glycoside may be considered to be derived from a monosaccharide, a disaccharide, a trisaccharide or even an oligosaccharide containing up to 9 sugar units. In the formula above one sugar unit is given.
The alkyl group may be any alkyl group from a methyl group up to a C30-alkyl group, preferably a C6-C24 alkyl group, more preferably a C8-C18 alkyl group. They may be derived from primary mono-hydric alcohols, containing the same number of carbon atoms, Commercially available mixtures of primary mono-hydric alcohols prepared via the oligomeri~ation of ethylene and hydroformylation or oxidation and hydrolysis of the resulting higher olefins are preferred. Examples of such alcohols are mixtures of Cg-, C10- and 2073~77 Cll-alkanols; mixtures of C12- and C13-alkanols; mixtures of C12-, C13-, C14- and C15-alkanols; mixtures of C14- and C15-alkanols;
mixtures of C10- and C12-alkanols; mixtures of C12- and C14-alkanols; mixtures of Cl~- and C18-alkanols; mixtures of C16-, C18- and C20-alkanols; mixtures o C14-, C16- and C18-alkanols and also alkanols and/or alkenols prepared by reduction of naturally occurring fatty esters.
The sugar component of the glycoside may be derived from a monosaccharide, e.g. glucose, mannose, galactose or fructose. The resulting glycoside is then called a glucoside, mannoside, galactoside or a fructoside. The monosaccharides are also pentoses.
If the sugar component of the glycoside is derived from a disacchari.de, the glycosides are lactoside, maltoside or gentiobioside. Sucrose does not form a glycoside. The first thres of these disaccharides are reducing sugars. Sucrose is non-reducing, since no hemiacetal hydroxyl is available.
The alkyl glycosides may comprise one sugar unit or more, even up to 9 sugar units, e.g. an a~kyl polyglucoside may comprise 1 to 5 sugar units (in the form of repeating units~. The alkyl glycosides are used in amounts of 0.01~ up to 2%, preferably 0.1%
to 0.5%, by weight calculated on the amount of water.
To study the influence of a small quantity of alkyl glycosides on the nucleation temperature, kinetics of crystal growth and morphology of the crystals, a mini laboratory tect loop was built to mimic transportation of a fluid comprising water and hydrocarbon under high pressure through a pipeline. The observations are made under dynamic test conditions. Hydrate formation and pipeline blocking by hydrates was observed, meanwhile temperatures were measured.
The mini laboratory test loop consisted of a 16 metre pipeline coil (diameter 6 mm), which was connected to a 2 litre high pressure autoclave, the latter connected to an ethane supply system. The autoclave also contained a stirrer. The temperature in the pipeline was controlled via a thermostated waterbath. A pump 2~73~77 situated in the pipeline provided a circulation stream through the pipeline from the autoclave via the pipeline back into the autoclave.
The pressure drop along the pipeline was measured with a Honeywell differential pressure transmitter. At three places the temperature was recorded: pipeline coil inlet, pipeline coil outlet and autoclave.
The pump was a plunger pump with three pumping heads, two in phase pumping half their volume and one 180 degrees out of phase pumping the full volume, so that a continuous flow profile was obtained. In another series of experiments a gear pump was used.
The mediurn consisted of demineralized water and n-decana, pressure being maintained by ethane at 20 bar. The system contained varying amounts of water and decane. The test conditions were:
system pressure 20 bar autoclave temperature 12 C
pumping volume 6.5 l/h autoclave stirrer 650 rpm cooling rate waterbath 5 C/h.
To simulate actual field conditions, a mixture of water and decane was pressurized with 20 bar pressure ethane gas resulting in hydrate formation at a temperature below 12 DC.
The system contains 400 ml and ~00 ml water respectively and 800 rnl n-decane.
After filling the autoclave with water and n-decane the system is pressurized with ethane to 20 bar while stirring the mixture.
The temperature of the autoclave and o~ the waterbath are set to 12 C and during one hour the mixture was purnped through the pipeline to approximate equilibrium. During this hour the ethane was dissolved, the pressure was kept constant at 20 bar by continuously supplying ethane. During the further experiment the waterbath was cooled to a temperature at which blocking in the coil occurs by hydrate forrnation or to a temperature of 2 C, both at a cooling rate of 5 C/h. If there is no blocking the cooling procedure is continued for 20 minutes. Aiter blocking the pump was :
:
' 2~73~77 stopped and the temperature of the coil was increased in steps of 2 C (or near hydrate equilibrium temperature with steps of 1 C).
After 10 minutes the pump was restarted. If there was no movement within 2 minutes, the pump was stopped and the sequence was repeated until restart occurred.
Depending upon the amount of water the system was blocked at a higher or a lower temperature. In undoped test runs using ethane, water and n-decane as model components the 16 m pipeline was blocked at a temperature of 6 C (average), whereas for an alkyl glucoside doped system pipeline operation was possible down to o C.
The alkyl glucosides are introduced into the system together with the water.
In the following tables the results of the experiments are given:
Example 1, 2 and Comparative Example A
Table I
Additive Concentration Blocking Restart percent by weight temperature temperature based on water (C) (C) 1 DOBANOL 91-lG 0.25 5.3 11.5 2 DOBANOL 91-3G 0.25 3.9 12.0 A None - 7.3 11.1 tests with 800 ml water and 800 ml n-decane.
plunger pump.
20 DOBANOL 91-lG is DOBANOL 91, a synthetic alcohol with Cg ? C10 and C11 carbon atoms, of which the alkyl oligo glucoside has an average degree of oligomerization (DP) of 1.5.
DOBANOL 91-3G is DOBANOL 91, of which the alkyl oligo glucoside has an average degree of oligomerization ~DP) of 2.5.
25 DOBANOL is a trade mark.
: , "~ ,.
. - 6 - 2 ~ 73 ~ 77 Example 3 and Comparative Example B
Table II
-Additive Concentration Blocking Restart percent by weight temperature temperature based on water ~C) (C) 3 DOBANOL 91-3G 0.25 <0.0 1.1.7 B None - 4 11 .
tests with 400 ml water and 800 ml n-decane.
gear pump.
A METHOD FOR PREVENTING OR RETARDING THE FORMATIO~ OF HYDRATES
The invention relates to a method for preventing or retarding the formation of hydrates or for reducing the tendency of hydrates to agglomerate during the transport of a fluid through a conduit.
It is well known in the art that the formation of hydrates in a conduit, e.g. a pipeline, during the transport of oil and gas is a serious problem, especially in areas with a low temperature in the winter season or in the sea. Generally the temperatures are so low that hydrate formation, due to the inevitable presence of co-produced water in the wells takes place, if no special steps are taken. Insulation decreases the chance of hydrate formation, but is expensive. If the field is relatively small and at long distance from the production platform the costs of insulation are too high to make the field economically attractive.
It is known to add anti-freeze compounds, like glycol or methanol, during transport. A disadvantage, however, is that large quantities of these compounds are required.
There has now been found a new group of compounds, the alkyl glycosides which have not this disadvantage, since they may be used in very small quantities which do not need to be recovered.
Moreover, these compounds change the crystal morphology of the hydrates in an advantageous manner.
The invention relates to a method for preventing or retarding the formation of hydrates or for reducing the tendency of hydrates to agglomerate, during the transport of a fluid comprising water and hydrocarbon, through a conduct, which method comprises adding to the fluid an alkyl glycoside.
The fluid may be a liquid or a gas, but is preferably a gas such as methane, ethane, propane, butane or isobutane. The fluid may be originated with oil wells as well as gas wells. The source may also produce natural gas.
2073~)77 Depending upon the pressure hydrates may be formed at temperatures well above the freezing point of water. Ethane hydrates, for example, are formed at pressures be-tween 10 and 30 bar ~1 and 3 MPa) and temperatures between 4 ~C and 14 C.
Formation an~ agglomeration of hydrate crystals will thus easily occur in pipelines in a cold atmosphere. Formation of hydrate crystals as well as agglomeration are not limited to gas wells, but occur also in oil wells, if water and gas are present in the fluid.
The alkyl glycosides, used in the process according to the invention have been discussed in Kirk-Othmer, ~ncyclopedia of Chemical Technology, 1951, under the heading "Glycosides", Volume 7, pages 263-273.
Alcohols conjugated with reducing sugars form alkyl glycosides, e.g. alkyl ~-D-glucopyranoside:
H H OH H H
OH H OH OR
- ~ , in which R represents the alkyl group and the linkage is through the anomeric carbon atom of the sugar radical.
The term glycoside is generic and the presence of a particular sugar residue is indicated by the appropriate term, as glucoside, galactoside, fructoside, etc.
The glycoside may be considered to be derived from a monosaccharide, a disaccharide, a trisaccharide or even an oligosaccharide containing up to 9 sugar units. In the formula above one sugar unit is given.
The alkyl group may be any alkyl group from a methyl group up to a C30-alkyl group, preferably a C6-C24 alkyl group, more preferably a C8-C18 alkyl group. They may be derived from primary mono-hydric alcohols, containing the same number of carbon atoms, Commercially available mixtures of primary mono-hydric alcohols prepared via the oligomeri~ation of ethylene and hydroformylation or oxidation and hydrolysis of the resulting higher olefins are preferred. Examples of such alcohols are mixtures of Cg-, C10- and 2073~77 Cll-alkanols; mixtures of C12- and C13-alkanols; mixtures of C12-, C13-, C14- and C15-alkanols; mixtures of C14- and C15-alkanols;
mixtures of C10- and C12-alkanols; mixtures of C12- and C14-alkanols; mixtures of Cl~- and C18-alkanols; mixtures of C16-, C18- and C20-alkanols; mixtures o C14-, C16- and C18-alkanols and also alkanols and/or alkenols prepared by reduction of naturally occurring fatty esters.
The sugar component of the glycoside may be derived from a monosaccharide, e.g. glucose, mannose, galactose or fructose. The resulting glycoside is then called a glucoside, mannoside, galactoside or a fructoside. The monosaccharides are also pentoses.
If the sugar component of the glycoside is derived from a disacchari.de, the glycosides are lactoside, maltoside or gentiobioside. Sucrose does not form a glycoside. The first thres of these disaccharides are reducing sugars. Sucrose is non-reducing, since no hemiacetal hydroxyl is available.
The alkyl glycosides may comprise one sugar unit or more, even up to 9 sugar units, e.g. an a~kyl polyglucoside may comprise 1 to 5 sugar units (in the form of repeating units~. The alkyl glycosides are used in amounts of 0.01~ up to 2%, preferably 0.1%
to 0.5%, by weight calculated on the amount of water.
To study the influence of a small quantity of alkyl glycosides on the nucleation temperature, kinetics of crystal growth and morphology of the crystals, a mini laboratory tect loop was built to mimic transportation of a fluid comprising water and hydrocarbon under high pressure through a pipeline. The observations are made under dynamic test conditions. Hydrate formation and pipeline blocking by hydrates was observed, meanwhile temperatures were measured.
The mini laboratory test loop consisted of a 16 metre pipeline coil (diameter 6 mm), which was connected to a 2 litre high pressure autoclave, the latter connected to an ethane supply system. The autoclave also contained a stirrer. The temperature in the pipeline was controlled via a thermostated waterbath. A pump 2~73~77 situated in the pipeline provided a circulation stream through the pipeline from the autoclave via the pipeline back into the autoclave.
The pressure drop along the pipeline was measured with a Honeywell differential pressure transmitter. At three places the temperature was recorded: pipeline coil inlet, pipeline coil outlet and autoclave.
The pump was a plunger pump with three pumping heads, two in phase pumping half their volume and one 180 degrees out of phase pumping the full volume, so that a continuous flow profile was obtained. In another series of experiments a gear pump was used.
The mediurn consisted of demineralized water and n-decana, pressure being maintained by ethane at 20 bar. The system contained varying amounts of water and decane. The test conditions were:
system pressure 20 bar autoclave temperature 12 C
pumping volume 6.5 l/h autoclave stirrer 650 rpm cooling rate waterbath 5 C/h.
To simulate actual field conditions, a mixture of water and decane was pressurized with 20 bar pressure ethane gas resulting in hydrate formation at a temperature below 12 DC.
The system contains 400 ml and ~00 ml water respectively and 800 rnl n-decane.
After filling the autoclave with water and n-decane the system is pressurized with ethane to 20 bar while stirring the mixture.
The temperature of the autoclave and o~ the waterbath are set to 12 C and during one hour the mixture was purnped through the pipeline to approximate equilibrium. During this hour the ethane was dissolved, the pressure was kept constant at 20 bar by continuously supplying ethane. During the further experiment the waterbath was cooled to a temperature at which blocking in the coil occurs by hydrate forrnation or to a temperature of 2 C, both at a cooling rate of 5 C/h. If there is no blocking the cooling procedure is continued for 20 minutes. Aiter blocking the pump was :
:
' 2~73~77 stopped and the temperature of the coil was increased in steps of 2 C (or near hydrate equilibrium temperature with steps of 1 C).
After 10 minutes the pump was restarted. If there was no movement within 2 minutes, the pump was stopped and the sequence was repeated until restart occurred.
Depending upon the amount of water the system was blocked at a higher or a lower temperature. In undoped test runs using ethane, water and n-decane as model components the 16 m pipeline was blocked at a temperature of 6 C (average), whereas for an alkyl glucoside doped system pipeline operation was possible down to o C.
The alkyl glucosides are introduced into the system together with the water.
In the following tables the results of the experiments are given:
Example 1, 2 and Comparative Example A
Table I
Additive Concentration Blocking Restart percent by weight temperature temperature based on water (C) (C) 1 DOBANOL 91-lG 0.25 5.3 11.5 2 DOBANOL 91-3G 0.25 3.9 12.0 A None - 7.3 11.1 tests with 800 ml water and 800 ml n-decane.
plunger pump.
20 DOBANOL 91-lG is DOBANOL 91, a synthetic alcohol with Cg ? C10 and C11 carbon atoms, of which the alkyl oligo glucoside has an average degree of oligomerization (DP) of 1.5.
DOBANOL 91-3G is DOBANOL 91, of which the alkyl oligo glucoside has an average degree of oligomerization ~DP) of 2.5.
25 DOBANOL is a trade mark.
: , "~ ,.
. - 6 - 2 ~ 73 ~ 77 Example 3 and Comparative Example B
Table II
-Additive Concentration Blocking Restart percent by weight temperature temperature based on water ~C) (C) 3 DOBANOL 91-3G 0.25 <0.0 1.1.7 B None - 4 11 .
tests with 400 ml water and 800 ml n-decane.
gear pump.
Claims (10)
1. A method for preventing or retarding the formation of hydrates or for reducing the tendency of hydrates to agglomerate, during the transport of a fluid comprising water and hydrocarbon, through a conduit, which method comprises adding to the fluid an alkyl glycoside.
2. A method as claimed in claim 1 wherein the fluid comprises one or more hydrocarbons consisting of the group: methane, ethane, propane, butane and isobutane.
3. A method as claimed in claim 1 or 2 wherein the fluid comprises natural gas.
4. A method as claimed in one or more of the claims 1-3 wherein the alkyl glycoside is a C6-C24 alkyl glycoside, preferably a C8-C18 alkyl glycoside.
5. A method as claimed in claim 1 or 4 wherein the glycoside is derived from a monosaccharide, a disaccharide, a trisaccharide or an oligosaccharide containing up to 9 sugar units.
6. A method as claimed in claim 1 and 5 wherein the alkyl glycoside is derived from a reducing saccharide.
7. A method as claimed in claim 5 or 6 wherein the glycoside is a glucoside, mannoside, galactoside, or fructoside.
8. A method as claimed in claim 5 or 6 wherein the glycoside is a lactoside, a maltoside or a gentiobioside.
9. A method as claimed in claims 5-7 wherein the alkyl glycoside is an alkyl polyglucoside containing 1 to 5 sugar units.
10. A method for preventing or retarding the formation of hydrates or for reducing the tendency of hydrates to agglomerate as claimed in claim 1, as hereinbefore described with special reference to the examples 1, 2 and 3.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB919115095A GB9115095D0 (en) | 1991-07-12 | 1991-07-12 | A method for preventing or retarding the formation of hydrates |
| GB9115095.3 | 1991-07-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2073577A1 true CA2073577A1 (en) | 1993-01-13 |
Family
ID=10698271
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002073577A Abandoned CA2073577A1 (en) | 1991-07-12 | 1992-07-10 | Method for preventing or retarding the formation of hydrates |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP0526929B1 (en) |
| CA (1) | CA2073577A1 (en) |
| DE (1) | DE69207671T2 (en) |
| DK (1) | DK0526929T3 (en) |
| GB (1) | GB9115095D0 (en) |
| NO (1) | NO922747L (en) |
| NZ (1) | NZ243511A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002074722A1 (en) | 2001-03-20 | 2002-09-26 | Isp Investments Inc. | Gas hydrate inhibitor |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5432292A (en) * | 1992-11-20 | 1995-07-11 | Colorado School Of Mines | Method for controlling clathrate hydrates in fluid systems |
| WO1994025727A1 (en) * | 1993-05-04 | 1994-11-10 | Bp Exploration Operating Company Limited | Hydrate inhibition |
| US6635604B1 (en) * | 1999-02-11 | 2003-10-21 | Baker Hughes Incorporated | Low molecular weight water soluble organic compounds as crystallization point suppressants in brines |
| WO2005005567A1 (en) | 2003-07-02 | 2005-01-20 | Exxonmobil Upstream Research Company | A method for inhibiting hydrate formation |
| RU2425860C2 (en) | 2006-03-15 | 2011-08-10 | Эксонмобил Апстрим Рисерч Компани | Method to produce hydrate suspension that does not create plug |
| US7958939B2 (en) | 2006-03-24 | 2011-06-14 | Exxonmobil Upstream Research Co. | Composition and method for producing a pumpable hydrocarbon hydrate slurry at high water-cut |
| WO2009042319A1 (en) | 2007-09-25 | 2009-04-02 | Exxonmobil Upstream Research Company | Method for managing hydrates in subsea production line |
| EP2275641A1 (en) * | 2009-06-02 | 2011-01-19 | Shell Internationale Research Maatschappij B.V. | Method of producing a combined gaseous hydrocarbon component stream and liquid hydrocarbon component streams, and an apparatus therefor |
| EP2508243A1 (en) | 2011-04-06 | 2012-10-10 | Shell Internationale Research Maatschappij B.V. | Method and apparatus for removing mercury from waste water from hydrocarbon well stream |
| US9988568B2 (en) | 2015-01-30 | 2018-06-05 | Ecolab Usa Inc. | Use of anti-agglomerants in high gas to oil ratio formations |
| FR3092331A1 (en) | 2019-02-06 | 2020-08-07 | Arkema France | COMPOSITION TO PREVENT AGGLOMERATION OF GAS HYDRATES |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2625547B1 (en) * | 1987-12-30 | 1990-06-22 | Inst Francais Du Petrole | PROCESS FOR DELAYING FORMATION AND / OR REDUCING THE TENDENCY TO AGGLOMERATION OF HYDRATES |
-
1991
- 1991-07-12 GB GB919115095A patent/GB9115095D0/en active Pending
-
1992
- 1992-07-09 DE DE69207671T patent/DE69207671T2/en not_active Expired - Fee Related
- 1992-07-09 DK DK92202095.3T patent/DK0526929T3/en active
- 1992-07-09 EP EP92202095A patent/EP0526929B1/en not_active Expired - Lifetime
- 1992-07-10 CA CA002073577A patent/CA2073577A1/en not_active Abandoned
- 1992-07-10 NO NO92922747A patent/NO922747L/en unknown
- 1992-07-10 NZ NZ243511A patent/NZ243511A/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002074722A1 (en) | 2001-03-20 | 2002-09-26 | Isp Investments Inc. | Gas hydrate inhibitor |
Also Published As
| Publication number | Publication date |
|---|---|
| DK0526929T3 (en) | 1996-06-10 |
| EP0526929A1 (en) | 1993-02-10 |
| NO922747D0 (en) | 1992-07-10 |
| NZ243511A (en) | 1994-03-25 |
| DE69207671T2 (en) | 1996-07-11 |
| DE69207671D1 (en) | 1996-02-29 |
| NO922747L (en) | 1993-01-13 |
| GB9115095D0 (en) | 1991-08-28 |
| EP0526929B1 (en) | 1996-01-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |