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| Number | Title | Issue Date |
| 5407009 | Process and apparatus for the recovery of hydrocarbons from a hydrocarbon deposit A method for the recovery of hydrocarbons from a hydrocarbon deposit overlying an aquifer, including injecting a hydrocarbon solvent in the vapour phase into the aquifer to mobilize hydrocarbons in the hydrocarbon deposit; and producing mobilized hydrocar... | 04/18/1995 |
| 5388645 | Method for producing methane-containing gaseous mixtures Processes are disclosed for separating an oxygen-containing gas into oxygen-enriched and oxygen-depleted streams. The oxygen-depleted stream is injected into a methane-containing solid carbonaceous subterranean formation to produce a methane-containing ga... | 02/14/1995 |
| 5388641 | Method for reducing the inert gas fraction in methane-containing gaseous mixtures obtained from underground formations A method for reducing the inert gas fraction volume percent present in a methane-containing mixture produced by injecting an inert gas into a solid carbonaceous subterranean formation is disclosed. The method reduces the inert gas fraction by suspending t... | 02/14/1995 |
| 5388643 | Coalbed methane recovery using pressure swing adsorption separation A method is disclosed for using a pressure swing adsorption separator system to provide an oxygen-depleted gaseous effluent for injecting into a suitable solid carbonaceous subterranean formation, such as a coalbed, to enhance the recovery of methane from... | 02/14/1995 |
| 5388640 | Method for producing methane-containing gaseous mixtures A method is disclosed for increasing the production of methane from a solid carbonaceous subterranean formation having a standard initial production rate of a methane-containing gas of X standard cubic feet per unit time. The method comprises the steps of... | 02/14/1995 |
| 5388642 | Coalbed methane recovery using membrane separation of oxygen from air A method of recovering methane from a solid carbonaceous subterranean formation having a production well in fluid communication with the formation and an injection well in fluid communication with the formation, comprising the steps of passing a gaseous f... | 02/14/1995 |
| 5388644 | Application of N,N-dialkylamides to reduce precipitation of asphalt from crude oil A method of reducing, preferably preventing, precipitation of asphalt from crude oil. In one aspect, crude oil is contacted in the borehole with at least one N,N-dialkylamide of a fatty acid having 8 to 22 carbon atoms. In an second aspect, precipitation ... | 02/14/1995 |
| 5381863 | Cyclic huff-n-puff with immiscible injection and miscible production steps A method of recovering hydrocarbons from a reservoir under an active waterflood or water drive by injecting a recovery fluid comprising carbon dioxide or nitrogen under immiscible conditions, allowing the recovery fluid to soak, and producing the recovery... | 01/17/1995 |
| 5362400 | Process for the purification of water The present invention refers to a process for creating in an aquifer an oxidation and precipitation zone (or a reduction zone) between a number of injection wells arranged around one or more extraction wells for purified water. The zone desired is created... | 11/08/1994 |
| 5358357 | Process and apparatus for high vacuum groundwater extraction Disclosed is a process and apparatus in which vacuum extraction is used to remove soil contaminants in both the saturated and vadose zones. One embodiment of the present invention is directed to a process for removing contaminants from a contaminated area... | 10/25/1994 |
| 5333687 | Long chain alcohol additives for surfactant foaming agents The invention is a method for increasing the effectiveness of steam or carbon dioxide foaming operations for improving conformance during steam or carbon dioxide floods by adding to the surfactant foaming solution an alcohol having about 8 to about 20 car... | 08/02/1994 |
| 5332036 | Method of recovery of natural gases from underground coal formations Methane is produced from a coal seam penetrated by an injection well and a gas production well by first introducing liquefied or gaseous carbon dioxide through the injection well and into the coal seam and subsequently introducing a weakly adsorbable gas ... | 07/26/1994 |
| 5314017 | Method of assisting the recovery of petroleum in vertically fractured formations utilizing carbon dioxide gas to establish gravity drainage The invention relates to assisting the recovery of petroleum from vertically fractured formations utilizing carbon dioxide gas to lower the interfacial tension between the gas and the petroleum in the vertical fractures and in the formation matrix adjacen... | 05/24/1994 |
| 5295540 | Foam mixture for steam and carbon dioxide drive oil recovery method The invention is a foam method for improving conformance during a steam flood or carbon dioxide flood in a subterranean, oil-containing formation penetrated by at least one injection well and at least one production well. In a steam flood oil recovery pro... | 03/22/1994 |
| 5279367 | Fatty acid additives for surfactant foaming agents The invention is a method for increasing the effectiveness of steam or carbon dioxide foaming operations for improving conformance during steam or carbon dioxide floods by adding to the surfactant foaming solution a fatty acid having about 12 to about 20 ... | 01/18/1994 |
| 5267615 | Sequential fluid injection process for oil recovery from a gas cap A process is provided for recovering oil from a gas cap in a subterranean oil-bearing formation by injecting a water-alternating-gas cycle into the gas cap via an injection well in fluid communication therewith. The cycle includes a slug of an aqueous flu... | 12/07/1993 |
| 5251697 | Method of preventing in-depth formation damage during injection of water into a formation In-depth formation damage is prevented during water injection by adding to the water non-compressible solids of sufficient size and concentration to form an external filter cake within the injection well. Preferably, the non-compressible solids are either... | 10/12/1993 |
| 5246861 | Use of nonradioactive complex metal anion as tracer in subterranean reservoirs Complex metal anions such as cobaltic hexacyanide are utilized as nonradioactive tracers in reservoir studies. Sensitive analytical procedures enable detection and measurement of very low tracer levels.... | 09/21/1993 |
| 5246072 | Method for enhancing the recovery of petroleum from an oil-bearing formation using a mixture including anionic and cationic surfactants A foam-forming composition comprising a mixture of at least one anionic surfactant and at least one cationic surfactant can effectively form a foam in a variety of formations including an oil-wet environment. In particular, this composition can be employe... | 09/21/1993 |
| 5244041 | Method for stimulating an effluent-producing zone adjoining an aquifer by lateral sweeping with a displacement fluid In a petroliferous zone surmounting an aquifer, a lateral sweep stimulation is achieved by means of a fluid capable of displacing the petroleum effluents (a warm fluid such as steam, a solvent, etc), which is injected into the formation through a deflecte... | 09/14/1993 |
| 5232049 | Sequentially flooding a subterranean hydrocarbon-bearing formation with a repeating cycle of immiscible displacement gases A process is provided for recovering liquid hydrocarbons from a subterranean hydrocarbon-bearing formation by sequential injection of a pair of immiscible gases of differing composition which displace the liquid hydrocarbons from the formation. The compos... | 08/03/1993 |
| 5203411 | Oil recovery process using mobility control fluid comprising alkylated diphenyloxide sulfonates and foam forming amphoteric surfactants The recovery of hydrocarbons from subterranean formations is improved by the use of a mobility control fluid comprising a mixture of at least one alkylated diphenyl oxide and at least one amphoteric surfactant. A preferred mobility control fluid comprises... | 04/20/1993 |
| 5195587 | Vapor recovery system In an oilfield production system, a water driven jet pump is used to evacuate vapors from storage tanks to thereby recover the vapors and prevent emissions from passing to the atmosphere. The jet pump entrains the vapors in process water which is passed t... | 03/23/1993 |
| 5178217 | Gas foam for improved recovery from gas condensate reservoirs Gas-condensate having an API gravity value greater than 55° is produced by injecting (1) a light noncondensable gas and (2) a foaming agent comprising a surfactant and water into a subterranean formation containing the gas condensate.... | 01/12/1993 |
| 5163510 | Method of microbial enhanced oil recovery A method of microbial enhanced oil recovery for recovering oil from an oil-bearing rock formation. A population of aerobic bacteria is introduced into the formation at a position spaced from a production borehole. The micro-organisms are adapted to use oi... | 11/17/1992 |
| 5143632 | Polysiloxane polymer having pendant aromatic groups useful in enhanced oil recovery using carbon dioxide flooding A polysiloxane polymer having pendant aromatic groups that is useful in increasing the viscosity of carbon dioxide. That polymer can be formed by reacting a polysiloxane containing at least one olefinic group with a phenyldialkylsilane. That polymer can b... | 09/01/1992 |
| 5133406 | Generating oxygen-depleted air useful for increasing methane production A method for generating oxygen-depleted air for injection into a subterranean coal seam for increasing production of methane. Air and produced fluids comprising methane are input into a fuel cell power system; and fuel cell power system exhaust comprising... | 07/28/1992 |
| 5129457 | Enhanced liquid hydrocarbon recovery process A polymer enhanced foam comprising a polymer selected from a synthetic polymer or a biopolymer, a surfactant, an aqueous solvent and a gas is injected into a fractured subterranean formation via a first well in fluid communication with the formation and p... | 07/14/1992 |
| 5123486 | Polysilylenesiloxane polymers useful in enhanced oil recovery using carbon dioxide flooding A polymer is disclosed that is useful in increasing the viscosity of carbon dioxide. That polymer comprises a polysilylenesiloxane polymer, preferably polydimethylsilylenedimethylsiloxane. That polymer can be used in a method for recovering oil from an un... | 06/23/1992 |
| 5121801 | Soluble for crosslinked graft copolymers of lignin based on hydroxyethylmethacrylate and acrylamide A soluble or crosslinked graft copolymer of lignin-(2-propenamide)-(2-methyl-3-oxo-4-oxyhex-1-ene-6-ol) having a central lignin network and at least one grafted side chain, R, having randomly repeating units of the formula: ##STR1## such that th... | 06/16/1992 |
| 5114497 | Soil decontamination An improved process for the remediation of soil contaminated by the presence therein of organic or semi-volatile inorganic contaminants which comprises (1) supplying thermal energy to the soil at one or more locations under the surface of the soil, (2) co... | 05/19/1992 |
| 5095984 | Transporting mobility control agents to high permeability zones A process for improved delivery of mobility control agents. The drive solvent is designed such that the plugging agent, e.g. surfactant or polymer, is soluble in the drive solvent under the injection conditions of temperature and pressure but is substanti... | 03/17/1992 |
| 5082577 | Method and composition for selectively reducing permeability to water in hydrocarbon reservoirs which are hot and saline For selectively reducing permeability to water in an underground formation producing oil and/or gas, injecting into the formation a composition comprising water, at least one water soluble aldehyde compound at a concentration (by weight) of 180 to 20,000 ... | 01/21/1992 |
| 5080169 | Polysilalkylenesilane polymer useful in enhanced oil recovery using carbon dioxide flooding A polymer is disclosed that is useful in increasing the viscosity of carbon dioxide. That polymer comprises a polysilalkylenesilane polymer, preferably polydimethylsilmethylenedimethylsilane. That polymer can be used in a method for recovering oil from an... | 01/14/1992 |
| 5076357 | Method of enhancing recovery of petroleum from an oil-bearing formation A method for enhancing the recovery of petroleum from an oil bearing formation during injection of a non-condensible gas comprises the at least periodic injection of a foam forming composition or a preformed foam into the reservoir. The foam comprises a m... | 12/31/1991 |
| 5074358 | Surfactant-stabilized foams for enhanced oil recovery A foam is provided for use in a subterranean oil-bearing formation for reducing and controlling the mobility of a gaseous drive fluid. The foam is generated using an inert gas and a fluorocarbon surfactant solution in admixture with an amphoteric or anion... | 12/24/1991 |
| 5074357 | Process for in-situ enrichment of gas used in miscible flooding A process for in-situ enrichment of gas used in miscible flooding in a subterranean hydrocarbon-bearing reservoir. A drive gas such as methane, lean natural gas, nitrogen, carbon dioxide or mixtures thereof is used to immiscibly displace formation hydroca... | 12/24/1991 |
| 5062483 | Treatment for reducing water coning in an oil reservoir The invention has application only to a first oil well producing oil having a high water cut, said oil well being completed in a reservoir having an increased gas saturation, in the vicinity of the first oil well, arising from injection of gas through an ... | 11/05/1991 |
| 5060727 | Method for improving enhanced recovery of oil using surfactant-stabilized foams A process is provided for enhancing the recovery of oil in a subterranean formation. The process involves injecting a surfactant-containing foam having oil-imbibing and transporting properties. A foam having such properties is selected either by determina... | 10/29/1991 |
| 5046560 | Oil recovery process using arkyl aryl polyalkoxyol sulfonate surfactants as mobility control agents A method for recovering oil from a subterranean formation is disclosed wherein an aqueous surfactant solution is injected into the formation to reduce the mobility of gas in a gas-flooding process. The gas may include hydrocarbon gas, inert gas, carbon di... | 09/10/1991 |
