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| Number | Title | Issue Date |
| 4446919 | Enhanced oil recovery using microorganisms A post-primary oil recovery process is provided in which carbon dioxide-tolerating microorganisms are injected into an oil-bearing subterranean formation and feed on nutrients which are extracted from the oil by carbon dioxide injected and maintained unde... | 05/08/1984 |
| 4429745 | Oil recovery method Oil is recovered from an oil-bearing reservoir in a process employing an in-situ combustion process utilizing a combustion-supporting gas containing at least 75% by volume pure oxygen, and preferably substantially pure oxygen, and a sequence in which the ... | 02/07/1984 |
| 4429744 | Oil recovery method Oil is recovered from an oil-bearing reservoir in a process employing an in-situ combustion process utilizing a combustion-supporting gas containing at least 75% by volume pure oxygen, and preferably substantially pure oxygen, and a sequence in which the ... | 02/07/1984 |
| 4427066 | Oil recovery method Oil is recovered from an oil-bearing reservoir in a process employing an in-situ combustion process utilizing a combustion-supporting gas containing at least 75% by volume pure oxygen, and preferably substantially pure oxygen, and a sequence in which the ... | 01/24/1984 |
| 4418753 | Method of enhanced oil recovery employing nitrogen injection Disclosed is a Process for the recovery of oil from a subterranean oil reservoir by miscible displacement. An initial light hydrocarbon slug is injected into the reservoir at a rate which results in fingering of the hydrocarbon through the reservoir oil t... | 12/06/1983 |
| 4415032 | Carbonated waterflooding for viscous oil recovery using a CO2 solubility promoter and demoter Viscous oil is recovered from a subterranean, viscous oil-containing formation by injecting a slug of CO2 carbonated water containing a CO2 solubility promoter, a slug of a CO2 solubility demoter, and a water drive to disp... | 11/15/1983 |
| 4410043 | Method for inhibition of carbonate dissolution in the recovery of oil utilizing CO2 Recovery of oil in a subterranean oil-bearing formation comprising injecting a slug of an aqueous solution containing a water-soluble salt comprising sodium oxalate or sodium fluoride, injecting a slug of CO2 and injecting a driving fluid to di... | 10/18/1983 |
| 4408664 | Secondary oil recovery method A method of oil recovery from subterranean formations, and especially water wet sand formation, comprising the steps of sequentially establishing a rate of oil production for the formation as a function of formation characteristics, such as perosity, perm... | 10/11/1983 |
| 4393936 | Method for the enhanced recovery of oil and natural gas A method for the enhanced recovery of both natural gas and liquid petroleum from hydrocarbon-containing subterranean formations, particularly dipping subterranean formations, by the consecutive steps of introducing a gaseous displacement fluid to recover ... | 07/19/1983 |
| 4385662 | Method of cyclic solvent flooding to recover viscous oils Oil may be recovered from viscous oil-containing formations including tar sand deposits by providing at least one injection well and at least one spaced-apart production well which extend downwardly from the surfaces and which extend to, and generally hor... | 05/31/1983 |
| 4375238 | Method for recovery of oil from reservoirs of non-uniform permeability In an oil bearing formation including at least two strata of differing permeabilities oil recovery is enhanced by the controlled injection of a miscible fluid under conditions selected so that the fluid has a density substantially greater than or substant... | 03/01/1983 |
| 4373585 | Method of solvent flooding to recover viscous oils Oil may be recovered from viscous oil-containing formations including tar sand deposits by first establishing a fluid communication path in the lower portion of the formation intermediate at least one injection well and a production well. A hydrocarbon so... | 02/15/1983 |
| 4373586 | Method of solvent flooding to recover viscous oils Oil may be recovered from viscous oil-containing formations including tar sand deposits by first establishing a fluid communication path in the lower portion of the formation intermediate at least one injection well and a production well. At least one add... | 02/15/1983 |
| 4372381 | Method for recovery of oil from tilted reservoirs A method for recovering oil from a tilted oil-bearing reservoir having a water zone in fluid communication with and directly below an oil zone wherein a large amount of solvent is injected along the water-oil interface so that a part of the solvent finger... | 02/08/1983 |
| 4344486 | Method for enhanced oil recovery Disclosed is a method and apparatus for the enhanced recovery of liquid hydrocarbons from underground formations, said method comprising recovering a mixture comprising carbon dioxide and contaminants comprising hydrocarbon, hydrogen sulfide, or mixtures ... | 08/17/1982 |
| 4343362 | Recovery of oil from an oil reservoir by miscible displacement Oil from an oil reservoir and subsequently from several oil reservoirs is recovered by injecting, in a first stage, a displacement agent in a gaseous state into the oil reservoir. Afterwards, in a second stage, there is withdrawn 90% of the displacement a... | 08/10/1982 |
| 4333529 | Oil recovery process Oil recovery from formations is effected using a gas stream containing steam, carbon dioxide and nitrogen which is injected into the formation to form a water-oil mixture which is removed from the formation. The gas stream is formed by wet oxidation of a ... | 06/08/1982 |
| 4330038 | Oil reclamation process A process for enhanced oil recovery by gas injection into oil-bearing formations which comprises wet oxidizing combustible carbonaceous materials with oxygen, air or a mixture of oxygen and air to obtain a gas comprising a mixture of water vapor and carbo... | 05/18/1982 |
| 4325432 | Method of oil recovery This invention relates to a method of recovering petroleum from a subterranean petroleum-containing formation comprising the steps of providing an injection well containing a flow path in fluid communication with at least a portion of the petroleum-contai... | 04/20/1982 |
| 4271905 | Gaseous and solvent additives for steam injection for thermal recovery of bitumen from tar sands A process is provided for the recovery of hydrocarbons from a reservoir of heavy oil containing sands. An injection stream comprising steam, hydrocarbon diluent, and a gas which is gaseous at formation temperature and pressure and soluable in the formatio... | 06/09/1981 |
| 4233166 | Composition for recovering hydrocarbons A process for recovering hydrocarbons from a subterranean formation in which in situ combustion is first initiated in the formation by injection of air, for example, through an injection well, the injection of air is terminated, carbon dioxide or nitrogen... | 11/11/1980 |
| 4224992 | Method for enhanced oil recovery The present invention is directed to an improved method for enhanced recovery of oil from relatively "cold" reservoirs by carbon dioxide flooding. In oil reservoirs at a temperature less than the critical temperature of 87.7° F. and at a pore pressure gr... | 09/30/1980 |
| 4217955 | Oil recovery process The recovery of oil from a subterranean hydrocarbon-bearing reservoir by the injection thereinto of a mixture of carbon dioxide and sulfur dioxide which is miscible with the reservoir oil at pressure and temperature prevailing in the reservoir. For produc... | 08/19/1980 |
| 4189184 | Rotary drilling and extracting process Process and apparatus is described for mining of subterranean carbonaceous deposits such as tar sands, in which the deposit is treated in situ with circulating high pressure jets of heated mining fluid comprising water in admixture with gaseous hydrocarbo... | 02/19/1980 |
| 4187910 | CO2 removal from hydrocarbon gas in water bearing underground reservoir A process for decreasing the CO2 content of hydrocarbon gas by injecting a hydrocarbon gas containing CO2 into a water bearing zone of an underground formation and producing hydrocarbon gas from a collection point in the underground ... | 02/12/1980 |
| 4160481 | Method for recovering subsurface earth substances This invention relates to novel leaching methods and apparatus for recovering minerals such as ores, high viscosity oil, and the like, from the subsurface earth formation. More specifically, the formation is penetrated by a plurality of mine shafts or lar... | 07/10/1979 |
| 4156462 | Hydrocarbon recovery process A two-step process for recovering hydrocarbons from a subterranean formation in which the formation is first heated by injecting steam at a temperature of about 500° to about 1500° F. through an injection well and in a second step a mixture of carbon mo... | 05/29/1979 |
| 4141417 | Enhanced oil recovery A process for petroleum recovery from an underground deposit by injecting hydrogen-rich gas in the absence of added hydrogenation catalysts into the underground deposit, the gas and deposit being at temperatures of less than 300° F., maintaining the hydr... | 02/27/1979 |
| 4133384 | Steam flooding hydrocarbon recovery process A method for recovering hydrocarbons from a subterranean formation in which steam, for example, is injected into the formation via an injection well to drive the hydrocarbons toward a spaced production well. Water injected via the production well into an ... | 01/09/1979 |
| 4109720 | Combination solvent-noncondensible gas injection method for recovering petroleum from viscous petroleum-containing formations including tar sand deposits Petroleum may be recovered from viscous petroleum-containing formations including tar sand deposits by injecting into the formation a solvent which is liquid at formation conditions and simultaneously therewith injecting a substance which will remain tota... | 08/29/1978 |
| 4099568 | Method for recovering viscous petroleum Steam flooding is frequently unsuccessful in viscous petroleum-containing formations such as tar sand deposits due to loss of steam transmissibility caused by the steam condensing deep in the formation and also caused by heated viscous petroleum forming a... | 07/11/1978 |
| 4071458 | Oil displacement fluid containing a solubilizing agent Petroleum may be recovered from viscous petroleum containing formations including tar sand deposits by first creating a fluid communication path in the formation, followed by injecting via an injection well an aromatic solvent such as benzene, saturated w... | 01/31/1978 |
| 4068716 | Oil recovery process utilizing aromatic solvent and steam Petroleum may be recovered from viscous petroleum containing formations including tar sand deposits by first creating a fluid communication path in the formation, followed by injecting via an injection well an aromatic solvent such as benzene, saturated w... | 01/17/1978 |
| 4058467 | Sulfonate water flood additives and method of using same Sulfonates having an equivalent weight of about 300 to about 600 are saturated with carbon dioxide and injected into a petroliferous formation to improve a waterflood process.... | 11/15/1977 |
| 4043395 | Method for removing methane from coal A process for removing methane from a subterranean coal deposit. A carbon dioxide-containing fluid is introduced into the coal deposit through an injection well and held therein for a period sufficient to enable a substantial amount of methane to be desor... | 08/23/1977 |
| 4026358 | Method of in situ recovery of viscous oils and bitumens A method for recovering low-gravity viscous oils and bitumen hydrocarbons from a subterranean hydrocarbon-bearing formation by injecting thereinto a hydrocarbon solvent saturated with a gas, and thereafter establishing a thermal sink in the formation, fol... | 05/31/1977 |
| 4024912 | Hydrogen generating system A partial oxidation process and system for burning crude oil with just enough oxygen in a gas generator to convert all of the carbon to carbon monoxide to form carbon monoxide and free hydrogen. Water or steam is added and the gas water reaction carried o... | 05/24/1977 |
| 3995693 | Reservoir treatment by injecting mixture of CO2 and hydrocarbon gas A process is provided in which hydrocarbon gas containing CO2 is injected into an oil containing reservoir as an aid in recovering oil from the reservoir. Oil can be produced from at least one production well in said reservoir while hydrocarbon... | 12/07/1976 |
