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| Number | Title | Issue Date |
| 4730671 | Viscous oil recovery using high electrical conductive layers A selectively electrically insulated, cemented and perforated tubular electrode provides a more effective system for electrically heating formations comprised of interbedded high and low electrical conductivity layers. The tubular electrode is located opp... | 03/15/1988 |
| 4704138 | Spouted bed heating of solids for coal gasification In a coal or coal char gasification system using hot recycled inert heat transfer medium (IHTM) solids, the heat transfer medium and some of the unreacted or ungasified char are passed through a spouted-bed reactor. In the spouted-bed reactor, the unreact... | 11/03/1987 |
| 4612988 | Dual aquafer electrical heating of subsurface hydrocarbons Electrical current is caused to flow between an electrode well located in an aquafer above viscous hydrocarbon-bearing formation and an electrode well located in an aquafer below the hydrocarbon-bearing formation. The electrical current thereby tends to s... | 09/23/1986 |
| 4566537 | Heavy oil recovery The invention discloses a method of producing viscous immobile oil from a subsurface formation. Initially, steam is injected into the formation for a period of time by way of an injection well and a production well. Thereafter, a combustion-supporting gas... | 01/28/1986 |
| 4552216 | Method of producing a stratified viscous oil reservoir This invention discloses a more efficient and more self supporting method of producing oil from a viscous oil-bearing permeability stratified reservoir. In situ combustion with oxygen is carried out near a first injection well in a manner such that carbon... | 11/12/1985 |
| 4532990 | Isolation of an electrical power transmission well In processes using electrical power to apply heat to a subsurface formation through a transmission well, power losses are reduced by installing in flowlines leading to the well one or more devices that electrically disrupts the flowline and that creates a... | 08/06/1985 |
| 4533743 | Furfural process Furfural yield and selectivity are maximized by reacting a 1 to 10 percent pentose 0.05 to 0.2 normal mineral acid aqueous solution in a plug flow reactor operated at a temperature between 220° C. and 300° C. The reaction residence time is short and is ... | 08/06/1985 |
| 4522262 | Single well electrical oil stimulation A single well method and apparatus for electrically applying heat and stimulating is comprised of a relatively lower surface area formation electrode and relatively high surface area overburden electrode extending downward into the borehole past low resis... | 06/11/1985 |
| 4503330 | Determining level or tilt angle of solids in a rotatable chamber The level or tilt angle of the surface of a bed of solids in the round portion of an elongated rotatable chamber is determined by directing a collimated gamma ray beam transversely through the chamber to a scintillation radioactive count rate detector. Th... | 03/05/1985 |
| 4499948 | Viscous oil recovery using controlled pressure well pair drainage A relatively closely spaced injection well and production well pair is used as a single electrode and is used in a way that significantly increases the effective radius of an electrode production location. This is achieved by appropriately spacing of the ... | 02/19/1985 |
| 4489782 | Viscous oil production using electrical current heating and lateral drain holes Improved electrical power utilization and increased oil production per producing well are achieved by specially completing a production well, applying electrical current through the production well to a subsurface formation, and producing oil from said fo... | 12/25/1984 |
| 4487230 | Increasing the output of a pipeline anode In the cathodic protection of tubular goods transporting fluids above 100° F. with aluminum or zinc anodes, the output efficiency of the anode is increased by thermally insulating the anode from the tubular goods on which the anode is placed.... | 12/11/1984 |
| 4484627 | Well completion for electrical power transmission There is provided a well completion for electrical alternating current power transmission that minimizes power losses and related corrosion problems. Casing is used both as the electrode and conductor. Most of the conductor portion is made of nonmagnetic ... | 11/27/1984 |
| 4473255 | Magnesium bicarbonate as an in situ uranium lixiviant In the subsurface solution mining of mineral values, especially uranium, in situ, magnesium bicarbonate leaching solution is used instead of sodium, potassium and ammonium carbonate and bicarbonates. The magnesium bicarbonate solution is formed by combini... | 09/25/1984 |
| 4443702 | Hand operated level detector A hand-held, caliper-like detector suitable for measuring the level of a nongaseous substance in a cylinder has two extending arms. The arms of the caliper-like detector are adapted to extend around a part of the cylinder. A gamma radiation source is loca... | 04/17/1984 |
| 4422830 | Performance of a pipeline additive injection system The suction side performance of an injection pump for pumping a viscous chemical liquid or semi-liquid additive into a liquid flowing in a pipeline is improved by simultaneously pumping a compatible low viscosity liquid into the line leading to the suctio... | 12/27/1983 |
| 4421520 | Reducing the tendency of dried coal to spontaneously ignite Mined, crushed, coal particles are dried and then contacted with a water-base dispersion or emulsion of latex paint type solids. The latex paint type solids form an elastic film that reduces the tendency of the dried coal to spontaneously ignite.... | 12/20/1983 |
| 4417623 | Sand consolidation with organic silicate Unconsolidated sand-like material in a subsurface formation adjacent a borehole of a water, oil, or gas well is consolidated by treating the formation first with a solution of alcohol and organic silicate and then with water. The water causes the organic ... | 11/29/1983 |
| 4413182 | Level detector The level of liquid or solid substances in a cylindrical chamber is detected using a radioactive source and detector mounted on a vertically movable member in horizontally spaced fixed relation to each other in a manner such that the source and detector m... | 11/01/1983 |
| 4407528 | High pressure insulating flange An easy to manufacture, strong, high pressure flange-type insulating coupling with wide separation between exposed metal parts is provided. The insulating coupling is made up of two metal half flanges supported on a nonconductive cylindrical nonmetallic m... | 10/04/1983 |
| 4406467 | High pressure electrical isolation flange gasket An electrical isolation, high pressure resistant gasket for API or ANSI seal ring flanges has four combined features. The gasket has two relatively thick, unyielding metal plates electrically separated from each other by an insulating material. The outer ... | 09/27/1983 |
| 4402707 | Deactivating dried coal with a special oil composition Mined, crushed, dried coal particles are sprayed with a special deactivating oil to reduce the tendency of the dried coal to spontaneously ignite. The special oil is a virgin vacuum reduced crude with a 5% point above 900° F., a characterization factor o... | 09/06/1983 |
| 4383837 | Efficient methane production with metal hydrides This invention concerns an efficient, high recovery, single product, multiple-stage process for producing high BTU methane from a low BTU feed gas containing carbon monoxide, hydrogen, nitrogen and other materials. In the process, impurities like hydrogen... | 05/17/1983 |
| 4351655 | Two stage carbon dioxide and methane separation A method is disclosed for standard distillation of a mixture of carbon dioxide and ethane derived from a prior separation state in a way that greater than normal separation is obtained. The greater separation is accomplished in two stages. In the first st... | 09/28/1982 |
| 4318711 | Converting low BTU gas to high BTU gas Low BTU feed gas formed by gasification of carbonaceous materials with air is converted to high BTU gas by partial carbon monoxide separation and by using the reducing characteristic of the remaining feed gas in the iron reduction unit of a standard iron-... | 03/09/1982 |
| 4314899 | Separating spent mineral matter from heat carriers In the pyrolysis of crushed mined hydrocarbonaceous mineral solids with hot heat carrying solids, the heat carrying solids are recovered from the pyrolyzed mineral matter, heated and recycled back to a primary pyrolysis zone. At an appropriate point in th... | 02/09/1982 |
| 4312639 | Process for heating solids for coal gasification In a coal gasification system using hot recycled inert heat transfer medium solids, before the solids are heated and recycled back to a gasification reactor, the solids are separated from ash and unreacted char. The unreacted char is thereafter burned pro... | 01/26/1982 |
| 4311495 | Separating carbon dioxide and ethane by liquid-liquid extraction A method is disclosed for separating a mixture of carbon dioxdie and ethane derived from a prior separation stage. The separation is accomplished by liquid-liquid extraction of a liquefied azeotrope of carbon dioxide and ethane with a liquid hydrocarbon h... | 01/19/1982 |
| 4262520 | Supplemental weight percent analysis for chromatography In chromatography, the weight percent of higher boiling hydrocarbons is estimated by comparing areas under the certain segments of chromatograms. This procedure is subject to both human and equipment errors. A supplemental procedure for measuring the perc... | 04/21/1981 |
| 4251288 | Photovoltaic device with specially arranged luminescent collector and cell A photovoltaic device for collecting solar radiation and converting it to electrical energy has a luminescent collector shaped in a way that maintains collecting area efficiency while allowing the photovoltaic cell to be entirely shadowed or protected fro... | 02/17/1981 |
| 4246093 | Handling of solids-laden hydrocarbonaceous bottoms in a retort using solid heat-carriers Crushed mined coal, oil shale or tar sands, feedstocks are retorted in a retort using heat-carrying solids to supply at least fifty percent of the heat required to produce an average retort temperature of between 700° F. (371° C.) and 1200° F. (649° C... | 01/20/1981 |
| 4246015 | Freeze-wash method for separating carbon dioxide and ethane A method is disclosed for separating a mixture of carbon dioxide and ethane derived from a prior separation stage. The separation is accomplished by freezing the carbon dioxide in an azeotrope of carbon dioxide and ethane and washing the ethane from the s... | 01/20/1981 |
| 4227990 | Thermal cracking of retort oil The thermal cracking of retort oil vapors in an elongated reactor is improved by passing the effluent oil vapors and gases from a retort to a thermal cracking unit before the temperature of the retort effluent falls below 680° F. This encourages the more... | 10/14/1980 |
| 4224655 | Anti-electrostatic procedure for opening petroleum equipment In the production and transportation of crude oil and natural gas in dry, cold areas, such as for example, the North Slope of Alaska, static electricity inside equipment like tanks and flowlines is a special problem when it is necessary to gain access to ... | 09/23/1980 |
| 4218304 | Retorting hydrocarbonaceous solids Mined, crushed hydrocarbonaceous solids are pyrolyzed in a retort with a gas containing hydrocarbons. The gas is heated to a suitable temperature of at least 600° F. Thereafter, a relatively small amount of oxygen is added to the heated gas outside the r... | 08/19/1980 |
| 4174629 | Detection of drilling oil filtrate invasion in a core During the analysis of sample oil from an oil bearing formation, drilling fluid oil filtrate invasion into a cored oil bearing subsurface formation is detected in a way that does not require the use of special chemicals or tracers. Significant oil filtrat... | 11/20/1979 |
| 4164257 | Internal protection of well casing In a water injection well, in place of corrosion inhibitors, the internal surface of a lower section of the casing is protected from corrosion by one or more galvanic sacrificial anodes placed in the section of casing. The anodes are mounted on a metal me... | 08/14/1979 |
| 4158620 | Retorting oil shale with iron oxide impregnated porous pellets Oil shale is mixed and retorted with hot porous pellets. The porous pellets have a surface area of at least 10 square meters per gram. Iron oxide is deposited or impregnated on the pellet surface area prior to retorting. The iron oxide imparts special pro... | 06/19/1979 |
| 4152245 | Separation of rock solids from heat carriers in an oil shale retorting process In an oil shale retorting process, hot heat-carrying solids are cycled to a retort zone to mix with and retort crushed oil shale, thereby producing gas, oil products, and a mixture of heat-carrier solids and spent shale solids. The spent shale solids cont... | 05/01/1979 |
| 4140544 | Divergent luminescent collector for photovoltaic device In the photovoltaic conversion of solar radiation to electrical energy, light energy passes through an upper or outer surface of a collector member where the light energy is absorbed and reradiated by luminescent materials in the collector. Internal light... | 02/20/1979 |
