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| Number | Title | Issue Date |
| 7621326 | Petroleum extraction from hydrocarbon formations Recovery of viscous hydrocarbon by hot fluid injection from subterranean formations is assisted by using a specially designed and under-reamed vertical well to form a central production cavity; combined with a plurality of specially perforated horizontal wells drill... | 11/24/2009 |
| 7059180 | Water cut rate of change analytic method A method of measuring a water effect on an underground non-water well includes the steps of assembling a history of water cut (WC) measurements for the well over an extended period of time, determining a water cut rate of change (R) for the well based upon the histo... | 06/13/2006 |
| 6679326 | Pro-ecological mining system The invention comprises a high pressure fluid barrier forming an enclosure boundary with respect to overburden and floor strata separated by one or more production strata containing desirable fluidizable deposits and/or potential reaction materials. A cen... | 01/20/2004 |
| 5358054 | Method and apparatus for controlling steam breakthrough in a well A method and apparatus for controlling the intrusion of steam (e.g. breakthrough) from a zone of a producing formation into a slotted liner of a gravel-packed, production well of a steam flood recovery operation. An assembly including a blank, scab condui... | 10/25/1994 |
| 5325920 | Enhanced oil recovery from low permeability reservoirs using organosilicone surfactants A method for enhanced oil recovery in a reservoir having a substantial silicon content where an organosilicone surfactant is co-injected with steam to generate a foam. The organosilicone surfactant component of the foam prevents a dissolution of the silic... | 07/05/1994 |
| 5174377 | Method for optimizing steamflood performance Disclosed is an invention for optimizing recovery of petroleum from a subterranean, petroleum containing formation by improving the efficiency of a steam drive through a linear heat reduction schedule and a partial shut-in of the producing well after stea... | 12/29/1992 |
| 5042583 | Steam foam drive method for enhanced oil recovery A process for the recovery of oil from a petroleum reservoir by improving steam sweep efficiency during steam-flooding, wherein a foaming agent is added to divert steam to unswept zones and the reservoir is penetrated by at least one injection well and at... | 08/27/1991 |
| 5022466 | Method for steam flooding profile control A method for minimizing well recompletions in a multiple zone hydrocarbonaceous fluid containing formation. A steam flooding enhanced oil recovery (EOR) is conducted in the upper zone of said formation via fluidly communicating injector and producer wells... | 06/11/1991 |
| 4845134 | Gelable compositions and use thereof in steam treatment of wells A gelable composition is provided which can be injected into a well prior to steam treatment of the well. The composition comprises water, a water-dispersible polymer, a water-dispersible first crosslinker and a water-dispersible second crosslinker, where... | 07/04/1989 |
| 4819725 | Recovering oil bypassed by a steam override zone The invention is a method of recovering oil bypassed by a steam override zone. First, the production well is drilled below the oil producing zone into an underlying interval. The well perforations in the oil producing zone are closed off. The underlying i... | 04/11/1989 |
| 4799548 | Gelable compositions and use thereof in steam treatment of wells A gelable composition is provided which can be injected into a well prior to steam treatment of the well. The composition comprises water, a water-dispersible polymer, a water-dispersible first crosslinker and a water-dispersible second crosslinker, where... | 01/24/1989 |
| 4787452 | Disposal of produced formation fines during oil recovery Recovered formation fines are pumped in slurry form into an injection well during an enhanced oil recovery process e.g. a steam flood. Said injection can be done incrementally in stages in conjunction with said process. Said fines improve the sweep effici... | 11/29/1988 |
| 4702317 | Steam foam floods with a caustic agent Disclosed is a process of adding a caustic material to a steam foam composed of steam, foaming agent and a non-condensible gas to increase the resistance and lifetime of a steam foam, said caustic agent selected from the group consisting of sodium carbona... | 10/27/1987 |
| 4665986 | Gel and method for reducing steam channeling A gel-forming composition is provided comprising a PVA based substance selected from the group consisting of a polyvinyl alcohol, a polyvinyl alcohol copolymer, and mixtures thereof, an aldehyde operable for crosslinking with the PVA based substance, and ... | 05/19/1987 |
| 4637466 | Method of improving conformance in steam floods with carboxylate steam foaming agents The disclosed invention is a group of steam foaming agents for injection with steam and a non-condensable gas to decrease permeability in steam swept zones and increase oil recovery. The foaming agents have the general formula: where R is an alkyl radical... | 01/20/1987 |
| 4627439 | Prebent ventricular/atrial cardiac pacing lead A lead for effecting either or both of ventricular or atrial cardiac pacing and an assembly method are provided. The lead has a portion that is molded with a prebent condition which enables the proper positioning of the atrial electrode and of the ventric... | 12/09/1986 |
| 4620594 | Vertical conformance steam drive oil recovery method The condition known as steam override is overcome by the use of a blocking agent to obstruct fluid flow in part of the override region combined with the closing of all passages of egress for injected steam except those having access to the region where by... | 11/04/1986 |
| 4607695 | High sweep efficiency steam drive oil recovery method In a steam flood oil recovery process wherein the oil-containing formation has a natural brine salinity concentration within the range of 10 to 20% by weight, sweep efficiency is improved by injecting steam until steam breakthrough occurs at the productio... | 08/26/1986 |
| 4540050 | Method of improving conformance in steam floods with steam foaming agents The disclosed invention is a group of steam foaming agents for injection with steam and a non-condensable gas to decrease permeability in steam swept zones and increase oil recovery. The foaming agents have the general formula: where R is an alkyl radical... | 09/10/1985 |
| 4456066 | Visbreaking-enhanced thermal recovery method utilizing high temperature steam The displacement efficiency of a steam drive process is improved and steam override reduced by rapidly injecting a predetermined amount of high temperature steam via an injection well into the formation to visbreak a portion of the oil in the formation pr... | 06/26/1984 |
| 4386658 | Solvent push-pull process for improving vertical conformance of steam drive process The vertical conformance of a steam drive process is improved and steam override reduced by utilizing a solvent push-pull process in the lower portion of the formation adjacent the production well. Steam is injected into the injection well with production... | 06/07/1983 |
| 4177752 | High vertical conformance steam drive oil recovery method The vertical conformance of a steam drive process is improved and steam override reduced by penetrating the zone between one injector and one producer, with an infill well which is in fluid communication with the bottom half of the formation, and producin... | 12/11/1979 |
| 4175618 | High vertical and horizontal conformance thermal oil recovery process Thermal oil recovery processes employing the injection of steam and/or hot water for mobilizing viscous petroleum sweep only a small fraction of the formation between the wells because of override, underride, or channeling resulting in poor vertical confo... | 11/27/1979 |
| 4166501 | High vertical conformance steam drive oil recovery method The vertical or both vertical and horizontal conformance of a steam drive process is improved and steam override reduced by penetrating the zone between one injector and one producer, with one or more infill wells in fluid communication with the bottom ha... | 09/04/1979 |
| 4166504 | High vertical conformance steam drive oil recovery method The vertical conformance of a steam drive process is improved and steam override reduced by penetrating the zone between one injection well and one producing well, with an infill well which is in fluid communication with the bottom half or less of the for... | 09/04/1979 |
| 4166503 | High vertical conformance steam drive oil recovery method The vertical conformance of a steam drive process is improved and steam override reduced by penetrating the recovery zone between one injection well and one producing well, with at least one infill well which is in fluid communication with no more than th... | 09/04/1979 |
| 4166502 | High vertical conformance steam drive oil recovery method The vertical conformance of a steam drive process is improved and steam override reduced by penetrating the zone between one injector and one producer, with an infill well located between the injector and producer which is in fluid communication with no m... | 09/04/1979 |
| 4068717 | Producing heavy oil from tar sands A method is provided for recovering heavy oil from an underground tar sand reservoir by injecting steam into an injection well penetrating the reservoir sufficiently to fracture the tar sand and provide passage for the steam through the tar sand to a prod... | 01/17/1978 |
| 3993133 | Selective plugging of formations with foam An improved process for decreasing the permeability of a subterranean oil-bearing formation which comprises injecting an aqueous surfactant solution containing a chemically crosslinkable, water-dispersible polymer which prevents the surfactant from foamin... | 11/23/1976 |
