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4429744 Oil recovery method
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New Patents
4429535 GEOTHERMAL PLANT SILICA CONTROL SYSTEM John Featherstone assigned to Magma Power Company
An internal combustion engine for a vehicle has an exhaust gas recirculation system for returning exhaust gases to the engine intake passage. The carburetion system for the engine includes a fuel enrichment valve. A control suction air line from the intake passage operates a regulating valve which controls the exhaust gas recirculation valve as well as the fuel enrichment valve. The flow resistance through the control suction air line is controlled by a prescribed control factor, which factor may depend upon the engine temperature alone or supplemented by engine speed, engine load (suction pressure), or atmospheric pressure.
4429744 OIL RECOVERY METHOD A system for reducing silica scaling in a geothermal power plant energized by high temperature, high silica content geothermal brine from a source such as the Salton Sea geothermal field or the Brawley geothermal field. Particulate material capable of seeding silica precipitation thereon is injected into one or more zones in heat extraction equipment such as steam separators where substantial temperature drops occur, so as to seed the precipitation o f dissolved silica from the brine in suspended, particulate form rather than as scaling in the heat extraction equipment. The silica precipitation seeding may be accomplished in flash crystallizer type steam separators, and the particulate seed material may be silica particles recovered from a reactor clarifier downstream of the heat extraction equipment.
4429676 EXHAUST GAS RECIRCULATION CONTROL SYSTEM FOR VEHICLE ENGINES
Evin Cook assigned to Mobil Oil Corporation 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 production well or wells are cyclically throttled. In place of using an insitu combustion process, mixtures of steam and carbon dioxide or mixtures of steam and low molecular weight C3-C8 hydrocarbons are injected into the reservoir and the production well is cyclically throttled. The production well flow rate is restricted until the bottom-hole pressure of the well has increased to an amount of about 30% to about 90% of the fluid injection pressure at the injection well. Thereafter, the production well is opened and oil is recovered therefrom as the bottom-hole pressure declines. The throttled production cycle may be repeated at appropriate intervals during the process.
4429745 Osamu Gotoh, Yutaka Otobe, Michio Kawamoto, Akira Fujimura, Tokyo, Japan assigned to H o n d a Giken Kogyo Kabushiki Kaisha
OIL RECOVERY METHOD Evin Cook assigned to Mobil Oil Corporation 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 production well or wells are cyclically throttled. In place of using an insitu combustion process, mixtures of steam and carbon dioxide or mixtures of steam and low
New Patents
4429535 GEOTHERMAL PLANT SILICA CONTROL SYSTEM John Featherstone assigned to Magma Power Company
An internal combustion engine for a vehicle has an exhaust gas recirculation system for returning exhaust gases to the engine intake passage. The carburetion system for the engine includes a fuel enrichment valve. A control suction air line from the intake passage operates a regulating valve which controls the exhaust gas recirculation valve as well as the fuel enrichment valve. The flow resistance through the control suction air line is controlled by a prescribed control factor, which factor may depend upon the engine temperature alone or supplemented by engine speed, engine load (suction pressure), or atmospheric pressure.
4429744 OIL RECOVERY METHOD A system for reducing silica scaling in a geothermal power plant energized by high temperature, high silica content geothermal brine from a source such as the Salton Sea geothermal field or the Brawley geothermal field. Particulate material capable of seeding silica precipitation thereon is injected into one or more zones in heat extraction equipment such as steam separators where substantial temperature drops occur, so as to seed the precipitation o f dissolved silica from the brine in suspended, particulate form rather than as scaling in the heat extraction equipment. The silica precipitation seeding may be accomplished in flash crystallizer type steam separators, and the particulate seed material may be silica particles recovered from a reactor clarifier downstream of the heat extraction equipment.
4429676 EXHAUST GAS RECIRCULATION CONTROL SYSTEM FOR VEHICLE ENGINES
Evin Cook assigned to Mobil Oil Corporation 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 production well or wells are cyclically throttled. In place of using an insitu combustion process, mixtures of steam and carbon dioxide or mixtures of steam and low molecular weight C3-C8 hydrocarbons are injected into the reservoir and the production well is cyclically throttled. The production well flow rate is restricted until the bottom-hole pressure of the well has increased to an amount of about 30% to about 90% of the fluid injection pressure at the injection well. Thereafter, the production well is opened and oil is recovered therefrom as the bottom-hole pressure declines. The throttled production cycle may be repeated at appropriate intervals during the process.
4429745 Osamu Gotoh, Yutaka Otobe, Michio Kawamoto, Akira Fujimura, Tokyo, Japan assigned to H o n d a Giken Kogyo Kabushiki Kaisha
OIL RECOVERY METHOD Evin Cook assigned to Mobil Oil Corporation 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 production well or wells are cyclically throttled. In place of using an insitu combustion process, mixtures of steam and carbon dioxide or mixtures of steam and low