WO2008070620A1 - Dehydrating treatment of oil and gas wells - Google Patents
Dehydrating treatment of oil and gas wells Download PDFInfo
- Publication number
- WO2008070620A1 WO2008070620A1 PCT/US2007/086276 US2007086276W WO2008070620A1 WO 2008070620 A1 WO2008070620 A1 WO 2008070620A1 US 2007086276 W US2007086276 W US 2007086276W WO 2008070620 A1 WO2008070620 A1 WO 2008070620A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- feed composition
- well
- formation
- carbon dioxide
- alkanol
- 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.)
- Ceased
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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
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
- C09K8/594—Compositions used in combination with injected gas, e.g. CO2 orcarbonated gas
-
- 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
- C09K8/528—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning inorganic depositions, e.g. sulfates or carbonates
-
- 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
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/92—Compositions for stimulating production by acting on the underground formation characterised by their form or by the form of their components, e.g. encapsulated material
Definitions
- the present invention relates to treating oil and gas production wells to improve their operational capacity.
- Production rates from wells in formations that contain oil or gas can be increased by hydrofracturing, in which a fluid is applied at high pressure within the formation to induce fractures and fissures in the formation and thereby stimulate release of the desired hydrocarbons from the formation.
- the fluid typically contains a liquid vehicle and additional solid and/or liquid components that enhance the penetration of the hydrofracturing fluid into the areas of the formation that are to be hydrofractured, and enhance the effectiveness of the fracturing that is carried out.
- the present invention solves these and other problems, and provides numerous advantages described herein, in a method for dehydrating a subterranean oil-containing or gas- containing formation that contains water in passages in the formation, comprising
- feed composition comprising 5 to 70 wt . % of an alkanol component selected from the group consisting of alkanols containing 1 to 3 carbon atoms and mixtures thereof, and 30 to 95 wt . % dense phase carbon dioxide, under a pressure from zero up to 25,000 psig and at a temperature of 0 0 F to 200 0 F,
- discharge phase carbon dioxide means carbon dioxide in the form it takes at a temperature 10 0 F below its critical temperature or higher and at a pressure 100 psi below its critical pressure or higher.
- a substance "solubilizes" or becomes “solubilized” when it forms a pumpable liquid with another one or more materials, whether by forming a solution or dispersion of the substance in the one or more other materials, or a solution or dispersion of the one or more other materials in the substance.
- the composition used in the present invention contains, at least, dense phase carbon dioxide and an alkanol component.
- dense phase carbon dioxide will be used in the following description to refer to the composition when it is ready to be fed down an oil or gas well, meaning that it contains all components that it will contain as it is fed down the well and that it is at the desired temperature and pressure at which it will be fed down the well.
- the preferred dense phase carbon dioxide is supercritical carbon dioxide, wherein the carbon dioxide is at a temperature above its critical temperature of 87.8°F and above its critical pressure of 1070 psia. However, carbon dioxide that is at a temperature somewhat below its critical temperature and/or at a pressure somewhat below its critical pressure can be used effectively as well.
- the dense phase carbon dioxide comprises at least 30 wt . % of the downhole composition, and more preferably at least 50 wt . % of the downhole composition. Higher amounts, up to 90 wt . % or even up to 95 wt . % of the downhole composition, can be used with good results.
- the alkanol component comprises at least 5 wt . % of the downhole composition.
- the alkanol component can comprise 10 wt . % or more of the downhole composition, up to 50 wt . % or even up to 70 wt . % .
- higher alkanol concentrations are preferred with higher amounts of water creating pore throat blockages in the capillaries in the formation passages to be dehydrated by the method of the present invention.
- the preferred alkanol component is methanol.
- the dense phase carbon dioxide and the alkanol component are the only substances present in the downhole composition. However, other compounds that are effective as solubilizers for the water in the formation can be present. It is preferred however that aromatic compounds, that is, compounds containing one or more than one benzene ring, should not be present in the downhole composition. Examples of such aromatic compounds include benzene, toluene, and xylenes.
- One preferred manner for preparing for and carrying out the present invention includes the following steps .
- the alkanol component and the carbon dioxide are combined in a vessel that can accommodate the pressures that are applied. This can be accomplished by, first, partially filling a suitable vessel with an amount of the alkanol component necessary to obtain the desired alkanol/carbon dioxide ratio. Then, carbon dioxide is fed into the vessel in an amount necessary to provide the desired ratio of the alkanol component to the carbon dioxide .
- the carbon dioxide can be provided from a conventional cylinder or larger storage/supply container which typically holds carbon dioxide under pressure. Any other components such as surfactant, additional solvent, and the like, are added to the vessel, or injected into the stream of carbon dioxide and alkanol while going downhole, in the desired amounts thereof.
- the mixture of alkanol and carbon dioxide (and any other components present) is heated, for instance by pumping it through a heat exchanger, to achieve the desired temperature. Satisfactory temperatures are generally in the range of 70 0 F to 170 0 F
- the mixture is then injected downhole.
- a nearly constant pump pressure is maintained, varying flow as necessary.
- Pressure up to 10,000 psig and even up to 25,000 psig is applied.
- the mixture is held downhole, by not releasing the pressure on the well opening, for a period of time sufficient to allow the mixture to solubilize water in the formation passages. Suitable hold times range from several minutes up to 24 hours.
- One way to determine an effective length of time is to determine the pressure at the well opening when injection of the feed mixture is completed, and to permit the mixture to remain in the well until the pressure has decreased by a predetermined amount such as by 25%. The decrease in pressure indicates that the feed mixture has penetrated into the formation and solubilized water as desired.
- the pressure on the mixture is released, allowing the mixture of solubilized water and alkanol to flow out of the well.
- Water removed from the formation passages can be replaced by hydrofracturing fluid fed into the well .
- Preparing the downhole composition for injection into the well requires a high pressure pump having a minimum 5000 psig working pressure; and a heater capable of heating the composition to the preferred supercritical temperature.
- One suitable heater is a direct-fired heater.
- Another useful heater uses an indirect line heater using glycol as the heating medium and tubes rated to the maximum discharge of the pump at 300 0 F.
- the temperature of the downhole composition is set at a value within 10 0 F of the temperature at the bottom of the well, if possible or at least mid hole temperature, to minimize the risk of imposing thermal shock on the piping at the bottom of the well.
- Injection of the carbon dioxide into the wellbore to control its pressure can be carried out in any of several ways, preferably accompanied by controlling its critical pressure for maximum heating results.
- the preferred way which in some cases, which is also more economical, is through use of tubing which is brought to the oil or gas well location coiled on a portable unit, rigged up next to the well, and uncoiled and fed into the wellbore, preferably to the full formation depth or short thereof.
- the heated composition is then injected into the coil tubing.
- the interior dimensions of the coil tubing would be sized for to allow the carbon dioxide to remain above its critical pressure allowing best heating control and maximum heat.
- a second way whose adaptation would depend principally on economics, would be to set a packer using the wells production tubing and then injecting the mixture down the tubulars.
- the composition that is recovered from the oil or gas well is a liquid that comprises water and alkanol that had been a component of the downhole composition.
- the method of the present invention has been shown to be effective in removing undesired water from within the well, resulting in improved production rates and economic value for the treated well when the well is subsequently subjected to a given hydrofracturing treatment.
- a preferred aspect of the present invention is the ability to use polar and non-polar solvents, alcohol and carbon dioxide, in wells and formations that do not contain accumulations of hydrocarbon solids (by which is meant hydrocarbons, namely compounds composed predominantly of carbon and hydrogen, that are solid at the conditions existing in an oil or gas well or at the conditions existing at the earth's surface outside the well, and which typically comprise paraffins and asphaltenes) .
- hydrocarbon solids by which is meant hydrocarbons, namely compounds composed predominantly of carbon and hydrogen, that are solid at the conditions existing in an oil or gas well or at the conditions existing at the earth's surface outside the well, and which typically comprise paraffins and asphaltenes.
- the absence of such solids means that alkanol and carbon dioxide fed into the formation are not consumed in solubilizng solid hydrocarbons, so that more of the mixture of alkanol and carbon dioxide is available for solubilization and removal of water from the formation.
- carbon dioxide is believed to establish an acidic pH in the composition that is fed downhole, and in the formation passages into which the composition passes, that reduces the tendency of clays present in the passages to swell. This reduced swelling would also enhance the ability of the hydrofracturing fluid to reach further into the formation passages where hydrofracturing is to occur.
- oil produced after treatment of an oil well by the method of the present invention has contained acceptable parts per million of residual alcohol levels.
- Another advantage is that the method of the present invention is carried out at the same well from which production of oil or gas will resume or will be enhanced, as distinguished from other technologies wherein compositions are injected into one or more injection wells some distance from the production well itself in the hope of increasing the flow of hydrocarbons out of the production well without putting anything down the production well.
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- 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)
- Oil, Petroleum & Natural Gas (AREA)
- Inorganic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Extraction Or Liquid Replacement (AREA)
Abstract
Water is removed from passages in a subterranean hydrocarbon formation by feeding into the passages a composition comprising 5 to 70 wt. % of alkanol(s) having 1 to 3 carbon atoms and 30 to 95 wt. % dense phase carbon dioxide, under a pressure greater than zero up to 25,000 psig and at a temperature of 0°F to 200°F, allowing the feed composition to remain in the well, whereby the feed composition solubilizes with said water in said passages, and then removing from said well a liquid product composition comprising said solubilized water and alkanol.
Description
DEHYDRATING TREATMENT OF OIL AND GAS WELLS
Field of the Invention
The present invention relates to treating oil and gas production wells to improve their operational capacity.
Background of the Invention
Production rates from wells in formations that contain oil or gas can be increased by hydrofracturing, in which a fluid is applied at high pressure within the formation to induce fractures and fissures in the formation and thereby stimulate release of the desired hydrocarbons from the formation. The fluid typically contains a liquid vehicle and additional solid and/or liquid components that enhance the penetration of the hydrofracturing fluid into the areas of the formation that are to be hydrofractured, and enhance the effectiveness of the fracturing that is carried out.
However, if excessive amounts of water have accumulated in the formation, especially in the passages of the formation into which the hydrofracturing fluid would be applied, then the desired hydrofracturing cannot be carried out as fully because the water blocks the hydrofracturing fluid from reaching as far into the passages of the formation as would be possible if the blocking water were not present. Thus, there remains a need for an effective method of removing induced and conic water from the areas of an oil or gas formation so as to improve the ability to stimulate production of hydrocarbons from the formation by hydrofracturing .
Brief Summary of the Invention
The present invention solves these and other problems, and provides numerous advantages described herein, in a method for dehydrating a subterranean oil-containing or gas- containing formation that contains water in passages in the formation, comprising
(a) feeding into a well that extends to said passages in said formation a feed composition comprising 5 to 70 wt . % of an alkanol component selected from the group consisting of alkanols containing 1 to 3 carbon atoms and mixtures thereof, and 30 to 95 wt . % dense phase carbon dioxide, under a pressure from zero up to 25,000 psig and at a temperature of 00F to 2000F,
(b) allowing the feed composition to remain in the well, whereby the feed composition solubilizes with said water in said passages, and then
(c) removing from said well a liquid product composition comprising said solubilized water and alkanol.
As used herein, "dense phase carbon dioxide" means carbon dioxide in the form it takes at a temperature 100F below its critical temperature or higher and at a pressure 100 psi below its critical pressure or higher.
As used herein, a substance "solubilizes" or becomes "solubilized" when it forms a pumpable liquid with another one or more materials, whether by forming a solution or dispersion of the substance in the one or more other materials, or a solution or dispersion of the one or more other materials in the substance.
Detailed Description of the Invention
The composition used in the present invention contains, at least, dense phase carbon dioxide and an alkanol component. The term "downhole composition" will be used in the following description to refer to the composition when it is ready to be fed down an oil or gas well, meaning that it contains all components that it will contain as it is fed down the well and that it is at the desired temperature and pressure at which it will be fed down the well. The preferred dense phase carbon dioxide is supercritical carbon dioxide, wherein the carbon dioxide is at a temperature above its critical temperature of 87.8°F and above its critical pressure of 1070 psia. However, carbon dioxide that is at a temperature somewhat below its critical temperature and/or at a pressure somewhat below its critical pressure can be used effectively as well.
The dense phase carbon dioxide comprises at least 30 wt . % of the downhole composition, and more preferably at least 50 wt . % of the downhole composition. Higher amounts, up to 90 wt . % or even up to 95 wt . % of the downhole composition, can be used with good results.
The alkanol component comprises at least 5 wt . % of the downhole composition. The alkanol component can comprise 10 wt . % or more of the downhole composition, up to 50 wt . % or even up to 70 wt . % . Generally, higher alkanol concentrations are preferred with higher amounts of water creating pore throat blockages in the capillaries in the formation passages to be dehydrated by the method of the present invention. The preferred alkanol component is methanol. In one preferred embodiment of the present invention, the dense phase carbon dioxide and the alkanol component are the only substances present in the downhole composition. However,
other compounds that are effective as solubilizers for the water in the formation can be present. It is preferred however that aromatic compounds, that is, compounds containing one or more than one benzene ring, should not be present in the downhole composition. Examples of such aromatic compounds include benzene, toluene, and xylenes.
One preferred manner for preparing for and carrying out the present invention includes the following steps . The alkanol component and the carbon dioxide are combined in a vessel that can accommodate the pressures that are applied. This can be accomplished by, first, partially filling a suitable vessel with an amount of the alkanol component necessary to obtain the desired alkanol/carbon dioxide ratio. Then, carbon dioxide is fed into the vessel in an amount necessary to provide the desired ratio of the alkanol component to the carbon dioxide . The carbon dioxide can be provided from a conventional cylinder or larger storage/supply container which typically holds carbon dioxide under pressure. Any other components such as surfactant, additional solvent, and the like, are added to the vessel, or injected into the stream of carbon dioxide and alkanol while going downhole, in the desired amounts thereof.
Next, the mixture of alkanol and carbon dioxide (and any other components present) is heated, for instance by pumping it through a heat exchanger, to achieve the desired temperature. Satisfactory temperatures are generally in the range of 700F to 1700F
The mixture is then injected downhole. Preferably a nearly constant pump pressure is maintained, varying flow as necessary. Pressure up to 10,000 psig and even up to 25,000 psig is applied. The mixture is held downhole, by not releasing the pressure on the well opening, for a period of time sufficient to allow the mixture to solubilize water in
the formation passages. Suitable hold times range from several minutes up to 24 hours. One way to determine an effective length of time is to determine the pressure at the well opening when injection of the feed mixture is completed, and to permit the mixture to remain in the well until the pressure has decreased by a predetermined amount such as by 25%. The decrease in pressure indicates that the feed mixture has penetrated into the formation and solubilized water as desired. After the desired hold time, the pressure on the mixture is released, allowing the mixture of solubilized water and alkanol to flow out of the well. Water removed from the formation passages can be replaced by hydrofracturing fluid fed into the well . Preparing the downhole composition for injection into the well requires a high pressure pump having a minimum 5000 psig working pressure; and a heater capable of heating the composition to the preferred supercritical temperature. One suitable heater is a direct-fired heater. Another useful heater uses an indirect line heater using glycol as the heating medium and tubes rated to the maximum discharge of the pump at 3000F. Preferably the temperature of the downhole composition is set at a value within 100F of the temperature at the bottom of the well, if possible or at least mid hole temperature, to minimize the risk of imposing thermal shock on the piping at the bottom of the well.
Injection of the carbon dioxide into the wellbore to control its pressure can be carried out in any of several ways, preferably accompanied by controlling its critical pressure for maximum heating results. The preferred way which in some cases, which is also more economical, is through use of tubing which is brought to the oil or gas well location coiled on a portable unit, rigged up next to the well, and uncoiled and fed into the wellbore, preferably to the full
formation depth or short thereof. The heated composition is then injected into the coil tubing. The interior dimensions of the coil tubing would be sized for to allow the carbon dioxide to remain above its critical pressure allowing best heating control and maximum heat. A second way, whose adaptation would depend principally on economics, would be to set a packer using the wells production tubing and then injecting the mixture down the tubulars.
After the composition has been held in the well for the desired period of time, the pressure being applied to the well at its opening is decreased or removed, whereupon a flowable, pumpable liquid composition is removed from the well. This removal can occur without external aid, relying on the internal pressures within the well itself or on remaining energy from the injected carbon dioxide, or can be aided by a suitable pump that withdraws the liquid from the well. If the well is allowed to flow back by itself the flow back should be controlled using a choke valve, increasing the flow back incrementally after the pressure begins to drop. The composition that is recovered from the oil or gas well is a liquid that comprises water and alkanol that had been a component of the downhole composition.
The method of the present invention has been shown to be effective in removing undesired water from within the well, resulting in improved production rates and economic value for the treated well when the well is subsequently subjected to a given hydrofracturing treatment.
A preferred aspect of the present invention is the ability to use polar and non-polar solvents, alcohol and carbon dioxide, in wells and formations that do not contain accumulations of hydrocarbon solids (by which is meant hydrocarbons, namely compounds composed predominantly of carbon and hydrogen, that are solid at the conditions existing in an oil or gas well or at the conditions existing at the
earth's surface outside the well, and which typically comprise paraffins and asphaltenes) . The absence of such solids means that alkanol and carbon dioxide fed into the formation are not consumed in solubilizng solid hydrocarbons, so that more of the mixture of alkanol and carbon dioxide is available for solubilization and removal of water from the formation.
Another advantage is that the carbon dioxide is believed to establish an acidic pH in the composition that is fed downhole, and in the formation passages into which the composition passes, that reduces the tendency of clays present in the passages to swell. This reduced swelling would also enhance the ability of the hydrofracturing fluid to reach further into the formation passages where hydrofracturing is to occur. In addition, oil produced after treatment of an oil well by the method of the present invention has contained acceptable parts per million of residual alcohol levels.
Another advantage is that the method of the present invention is carried out at the same well from which production of oil or gas will resume or will be enhanced, as distinguished from other technologies wherein compositions are injected into one or more injection wells some distance from the production well itself in the hope of increasing the flow of hydrocarbons out of the production well without putting anything down the production well.
Claims
1. A method for dehydrating a subterranean oil- containing or gas-containing formation that contains water in passages in the formation, comprising
(a) feeding into a well that extends to said passages in said formation a feed composition comprising 5 to 70 wt . % of an alkanol component selected from the group consisting of alkanols containing 1 to 3 carbon atoms and mixtures thereof, and 30 to 95 wt . % dense phase carbon dioxide, under a pressure from zero up to 25,000 psig and at a temperature of 00F to 2000F,
(b) allowing the feed composition to remain in the well, whereby the feed composition solubilizes with said water in said passages, and then
(c) removing from said well a liquid product composition comprising said solubilized water and alkanol.
2. A method according to claim 1 wherein said feed composition comprises 50 wt . % to 95 wt . % dense phase carbon dioxide .
3. A method according to claim 1 wherein said feed composition comprises 5 wt . % to 50 wt . % of said alkanol component.
4. A method according to claim 1 wherein said feed composition is fed at a temperature of 700F to 1700F.
5. A method according to claim 1 wherein said feed composition is free of aromatic compounds.
6. A method according to claim 1 wherein said formation into which said feed composition is fed does not contain an accumulation of hydrocarbon solids.
7. A method according to claim 1 wherein said alkanol component comprises methanol.
8. A method according to claim 7 wherein said feed composition comprises 50 wt . % to 95 wt . % dense phase carbon dioxide .
9. A method according to claim 7 wherein said feed composition comprises 5 wt . % to 50 wt . % of methanol.
10. A method according to claim 7 wherein said feed composition is fed at a temperature of 700F to 1700F.
11. A method according to claim 7 wherein said feed composition is free of aromatic compounds.
12. A method according to claim 7 wherein said formation into which said feed composition is fed does not contain an accumulation of hydrocarbon solids.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002672031A CA2672031A1 (en) | 2006-12-04 | 2007-12-03 | Dehydrating treatment of oil and gas wells |
| MX2009005697A MX2009005697A (en) | 2006-12-04 | 2007-12-03 | Dehydrating treatment of oil and gas wells. |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US87272406P | 2006-12-04 | 2006-12-04 | |
| US60/872,724 | 2006-12-04 | ||
| US11/937,715 | 2007-11-09 | ||
| US11/937,715 US20080128135A1 (en) | 2006-12-04 | 2007-11-09 | Dehydrating treatment of oil and gas wells |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2008070620A1 true WO2008070620A1 (en) | 2008-06-12 |
Family
ID=39276189
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/US2007/086276 Ceased WO2008070620A1 (en) | 2006-12-04 | 2007-12-03 | Dehydrating treatment of oil and gas wells |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US20080128135A1 (en) |
| CA (1) | CA2672031A1 (en) |
| MX (1) | MX2009005697A (en) |
| WO (1) | WO2008070620A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104533362A (en) * | 2014-12-22 | 2015-04-22 | 中国石油大学(北京) | Method for Immiscible Flooding to Increase Liquid Phase Volume Expansion of CO2 and Crude Oil System |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4800957A (en) * | 1987-07-30 | 1989-01-31 | Texaco Inc. | Recovering hydrocarbons with a mixture of carbon dioxide and alcohol |
| US4964467A (en) * | 1989-10-06 | 1990-10-23 | Halliburton Company | Non-aqueous viscosified carbon dioxide and method of use |
| US20040256104A1 (en) * | 2003-06-19 | 2004-12-23 | Conocophillips Company | Liquid carbon dioxide cleaning of wellbores and near-wellbore areas |
| US20050126784A1 (en) * | 2003-12-10 | 2005-06-16 | Dan Dalton | Treatment of oil wells |
Family Cites Families (25)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4033411A (en) * | 1975-02-05 | 1977-07-05 | Goins John T | Method for stimulating the recovery of crude oil |
| US4113011A (en) * | 1977-03-07 | 1978-09-12 | Union Oil Company Of California | Enhanced oil recovery process |
| US4250965A (en) * | 1979-03-16 | 1981-02-17 | Wiseman Jr Ben W | Well treating method |
| US4212354A (en) * | 1979-03-19 | 1980-07-15 | Service Fracturing Company and Airry, Inc. | Method for injecting carbon dioxide into a well |
| US4343362A (en) * | 1980-01-29 | 1982-08-10 | Institutul De Cercetari Si Proiectari Pentru Petrol Si Gaze | Recovery of oil from an oil reservoir by miscible displacement |
| US4495995A (en) * | 1980-05-19 | 1985-01-29 | Phillips Petroleum Company | Method for plugging and subsequent treatment of subterranean formations |
| US4390068A (en) * | 1981-04-03 | 1983-06-28 | Champlin Petroleum Company | Carbon dioxide stimulated oil recovery process |
| CA1134258A (en) * | 1981-09-28 | 1982-10-26 | Ronald S. Bullen | Carbon dioxide fracturing process |
| US4455860A (en) * | 1982-12-07 | 1984-06-26 | Mobil Oil Corporation | Method and apparatus for determining CO2 minimum miscibility pressure of reservoir oil |
| US4455175A (en) * | 1983-08-01 | 1984-06-19 | The Dow Chemical Company | Method for removing or retarding paraffin buildup on surfaces in contact with crude oil |
| US4536222A (en) * | 1983-08-01 | 1985-08-20 | The Dow Chemical Company | Method for removing or retarding paraffin buildup on surfaces in contact with natural gas |
| US4593763A (en) * | 1984-08-20 | 1986-06-10 | Grayco Specialist Tank, Inc. | Carbon dioxide well injection method |
| US4609043A (en) * | 1984-10-22 | 1986-09-02 | Mobil Oil Corporation | Enhanced oil recovery using carbon dioxide |
| US4678036A (en) * | 1985-02-22 | 1987-07-07 | Mobil Oil Corporation | Miscible oil recovery process |
| US4679627A (en) * | 1985-08-12 | 1987-07-14 | Harrison William M | Method of oil recovery |
| US4617993A (en) * | 1985-09-03 | 1986-10-21 | Texaco Inc. | Carbon dioxide stimulated oil recovery process |
| US5022467A (en) * | 1987-06-03 | 1991-06-11 | Chevron Research Company | Polymer containing pendant silyl ether groups useful in enhanced oil recovery using CO2 flooding |
| US5045220A (en) * | 1987-06-03 | 1991-09-03 | Chevron Research Company | Increasing the viscosity of CO2 solutions |
| US4899817A (en) * | 1988-12-15 | 1990-02-13 | Mobil Oil Corporation | Miscible oil recovery process using carbon dioxide and alcohol |
| US5381863A (en) * | 1994-01-13 | 1995-01-17 | Texaco Inc. | Cyclic huff-n-puff with immiscible injection and miscible production steps |
| US5632336A (en) * | 1994-07-28 | 1997-05-27 | Texaco Inc. | Method for improving injectivity of fluids in oil reservoirs |
| CA2131195C (en) * | 1994-08-26 | 1997-04-29 | Dwight N. Loree | Method of improving oil and gas well productivity |
| US6170264B1 (en) * | 1997-09-22 | 2001-01-09 | Clean Energy Systems, Inc. | Hydrocarbon combustion power generation system with CO2 sequestration |
| US5711373A (en) * | 1995-06-23 | 1998-01-27 | Exxon Production Research Company | Method for recovering a hydrocarbon liquid from a subterranean formation |
| US6305472B2 (en) * | 1998-11-20 | 2001-10-23 | Texaco Inc. | Chemically assisted thermal flood process |
-
2007
- 2007-11-09 US US11/937,715 patent/US20080128135A1/en not_active Abandoned
- 2007-12-03 MX MX2009005697A patent/MX2009005697A/en unknown
- 2007-12-03 CA CA002672031A patent/CA2672031A1/en not_active Abandoned
- 2007-12-03 WO PCT/US2007/086276 patent/WO2008070620A1/en not_active Ceased
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4800957A (en) * | 1987-07-30 | 1989-01-31 | Texaco Inc. | Recovering hydrocarbons with a mixture of carbon dioxide and alcohol |
| US4964467A (en) * | 1989-10-06 | 1990-10-23 | Halliburton Company | Non-aqueous viscosified carbon dioxide and method of use |
| US20040256104A1 (en) * | 2003-06-19 | 2004-12-23 | Conocophillips Company | Liquid carbon dioxide cleaning of wellbores and near-wellbore areas |
| US20050126784A1 (en) * | 2003-12-10 | 2005-06-16 | Dan Dalton | Treatment of oil wells |
Also Published As
| Publication number | Publication date |
|---|---|
| US20080128135A1 (en) | 2008-06-05 |
| CA2672031A1 (en) | 2008-06-12 |
| MX2009005697A (en) | 2009-07-22 |
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