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| Number | Title | Issue Date |
| 8113272 | Three-phase heaters with common overburden sections for heating subsurface formations A heating system for a subsurface formation is described. The heating system includes three substantially u-shaped heaters with first end portions of the heaters being electrically coupled to a single, three-phase wye transformer and second end portions of the heate... | 02/14/2012 |
| 8096349 | Apparatus for extraction of hydrocarbon fuels or contaminants using electrical energy and critical fluids The extraction of hydrocarbon fuel products such as kerogen oil and gas from a body of fixed fossil fuels such as oil shale is accomplished by applying a combination of electrical energy and critical fluids with reactants and/or catalysts down a borehole to initiate... | 01/17/2012 |
| 8066060 | Portable down hole tool During the production of crude oil, naturally occurring paraffin can be deposited on the inside surfaces of production tubing. These wax deposits reduce the cross sectional area of the tubing and can reduce or completely halt the flow of oil from the well. Cu... | 11/29/2011 |
| 8042610 | Parallel heater system for subsurface formations A heating system for a subsurface formation is disclosed. The system includes a plurality of substantially horizontally oriented or inclined heater sections located in a hydrocarbon containing layer in the formation. At least a portion of two of the heater sections ... | 10/25/2011 |
| 7891416 | Apparatus for treating fluid streams cross-reference to related applications An apparatus and method for increasing and regulating temperature, pressure and fluid viscosities of fluid streams found in oil and gas production. The apparatus may heat fluids flowing from the reservoir to the surface, or heat fluids injected from the surface into... | 02/22/2011 |
| 7730936 | Active cable for wellbore heating and distributed temperature sensing A heating and distributed-temperature-sensor cable permanently fixed in a wellbore that permits known amounts of heat to be introduced to subsurface formations and improved temperature measurement thereof. The heat is introduced into a target zone of the wellbore by... | 06/08/2010 |
| 7510000 | Reducing viscosity of oil for production from a hydrocarbon containing formation Certain embodiments provide a method for treating a hydrocarbon containing formation. The method includes applying electrical current to one or more electrical conductors located in an opening in the formation to provide an electrically resistive heat output. The he... | 03/31/2009 |
| 7490665 | Variable frequency temperature limited heaters Certain embodiments provide a heating system configured to heat at least a part of a subsurface formation. The system includes an electrical power supply. A heater section includes one or more electrical conductors electrically coupled to the electrical power supply... | 02/17/2009 |
| 7461691 | In situ recovery from a hydrocarbon containing formation An in situ process for treating a hydrocarbon containing formation is provided. The process may include providing heat from one or more heaters to at least a portion of the formation. The heat may be allowed to transfer from the one or more heaters to a part of the ... | 12/09/2008 |
| 7431076 | Temperature limited heaters using modulated DC power The invention provides a system configured to heat at least a part of a subsurface formation. The system includes: an electrical power supply configured to provide modulated direct current (DC); and one or more electrical conductors configured to be electrically cou... | 10/07/2008 |
| 7422063 | Hydrocarbon recovery from subterranean formations Recovery of viscous hydrocarbon by hot fluid injection into subterranean formations is assisted by using a specially designed and under-reamed vertical wellbore with multiple injection perforations separated from the production perforations by a moveable packer. In ... | 09/09/2008 |
| 7383877 | Temperature limited heaters with thermally conductive fluid used to heat subsurface formations Certain embodiments provide a system including a heater. The heater includes one or more electrical conductors. The heater is configured to generate a heat output during application of electrical current to the heater. The heater includes a ferromagnetic material. A... | 06/10/2008 |
| 7370704 | Triaxial temperature limited heater Certain embodiments provide a heater. The heater includes an inner electrical conductor. A heater section at least partially surrounds the inner electrical conductor. The heater section is configured to generate an electrically resistive heat output during applicati... | 05/13/2008 |
| 7357180 | Inhibiting effects of sloughing in wellbores Certain embodiments provide a method for treating a subsurface formation. The method includes providing one or more explosives into portions of one or more wellbores selected for the explosion in the formation. The wellbores are formed in one or more zones in the fo... | 04/15/2008 |
| 7353872 | Start-up of temperature limited heaters using direct current (DC) Certain embodiments provide a method for heating a subsurface formation. The method includes applying direct electrical current (DC) to a heater section below a first selected temperature to provide an electrically resistive heat output. The heater section includes ... | 04/08/2008 |
| 7350589 | Telemetering system A pipe installation system has a pipe composed of sections that are added and removed to increase and decrease a length of the pipe. The system further has a cable storage spool for stowing a length of cable in a compact manner inside the pipe and for paying out the... | 04/01/2008 |
| 7347267 | Method and apparatus for cooling flasked instrument assemblies Method and apparatus are provided to accelerate the cooling of thermally sensitive components in a chamber of a downhole instrument assembly. In accordance with the invention, a passage is formed in the chamber and a fluid is conveyed through the passage to cool the... | 03/25/2008 |
| 7322410 | Controllable production well packer An apparatus and method for operating an electrically powered device in a packer using the piping structure of the well as an electrical conductor for providing power and/or communications. The electrically powered device may comprise an electrically controllable va... | 01/29/2008 |
| 7320364 | Inhibiting reflux in a heated well of an in situ conversion system Certain embodiments provide a method for treating a subsurface formation. The method includes using heaters to form a heated portion of the subsurface formation. A production conduit is used to direct formation fluid in a vapor phase from the heated portion of the s... | 01/22/2008 |
| 7311151 | Substantially neutrally buoyant and positively buoyant electrically heated flowlines for production of subsea hydrocarbons A flowline is described for producing hydrocarbons from a subsea well that is comprised of a substantially neutrally buoyant tubular composite umbilical. The flowline may possess electrical heating apparatus within the tubular walls of the tubular composite umbilica... | 12/25/2007 |
| 7311703 | Devices and methods for cooling microwave antennas Devices and methods for cooling microwave antennas are disclosed herein. The cooling systems can be used with various types of microwave antennas. One variation generally comprises a handle portion with an elongate outer jacket extending from the handle portion. A m... | 12/25/2007 |
| 7285762 | Sealing method and apparatus for oil and gas wells Apparatus and method for melting material in the annulus of an oil or gas well and thereby sealing the annulus to prevent shallow gas leakage and the like. Conveniently, the material is positioned within the annulus between the production and surface casing of the w... | 10/23/2007 |
| 7282638 | Protection profile for subsea cables An elongated object for use in subsea having a heating pipe and an electrical cable fixed to the surface of the heating pipe. The electrical cable has a protective sleeving for surrounding the electrical cable, composed of a series of elongated synthetic plastics co... | 10/16/2007 |
| 7268744 | Method and apparatus for controlling temperature gradients within a structure being cooled A phased array antenna apparatus has a plurality of circuit portions which are each coupled to a respective antenna element. Capillary pressure of a cooling fluid within a wick in a loop is utilized to urge the fluid to travel around the loop, the wick being dispose... | 09/11/2007 |
| 7264056 | System and method for the mitigation of paraffin wax deposition from crude oil by using ultrasonic waves A method for mitigating the deposition of wax on production tubing walls. The method comprises positioning at least one ultrasonic frequency generating device adjacent the production tubing walls and producing at least one ultrasonic frequency thereby disintegrating... | 09/04/2007 |
| 7259688 | Wireless reservoir production control A reservoir production control system includes a plurality of wells for producing a reservoir linked to a central computer over a downhole communication network and a surface communication network. Both the downhole and the surface communication networks are wireles... | 08/21/2007 |
| 7243721 | Methods and apparatus for heating oil production reservoirs Methods and apparatus employing inert gases injected into the lower level of sloping underground oil-bearing formations as a driving mechanism and water injected into the upper level of the formations as a gas blocking mechanism for increasing and extending the prod... | 07/17/2007 |
| 7225866 | In situ thermal processing of an oil shale formation using a pattern of heat sources A oil shale formation may be treated using an in situ thermal process. A mixture of hydrocarbons, H2, and/or other formation fluids may be produced from the formation. Heat may be applied to the formation to raise a temperature of a portion of the formati... | 06/05/2007 |
| 7193150 | Submersible pump cable with air line A submersible pump cable includes a conductive wire and an air line. The air line is structured to determine the depth at which the submersible pump cable lies beneath a liquid. ... | 03/20/2007 |
| 7188669 | Motor cooler for submersible pump A motor cooler for an electrical submersible pump (ESP). The ESP is typically deployed within casing and defines an annular space between the ESP and the casing. The ESP includes a pump having an intake, a motor cooler pump having an output port, a seal section belo... | 03/13/2007 |
| 7190084 | Method and apparatus for generating electrical energy downhole A method and apparatus that uses the flow of drilling fluid to generate electrical energy in a downhole environment. A substantially cylindrical housing comprises a wall having an inlet, an outlet, and a hollow passageway therebetween. A flow of drilling fluid throu... | 03/13/2007 |
| 7185702 | Methods and compositions for the in-situ thermal stimulation of hydrocarbons using peroxide-generating compounds One embodiment provides a method for stimulating hydrocarbon production in a subterranean formation, comprising: introducing a peroxide-generating compound into a desired location in a subterranean formation, wherein the peroxide-generating compound is substantially... | 03/06/2007 |
| 7182132 | Linearly scalable geothermic fuel cells A ceramic fuel cell(s) is supported in a heat conductive interconnect plate, and a plurality of plates form a conductive heater named a stack. Connecting a plurality of stacks forms a stick of fuel cells. By connecting a plurality of sticks end to end, a string of f... | 02/27/2007 |
| 7164590 | Power transfer system with reduced component ratings A power inverter control adjusts input power to track with output power to reduce energy handling requirements for an inverter DC bus. Input power to the power inverter circuit is measured and compared with a measurement of inverter output power. The comparison resu... | 01/16/2007 |
| 7155990 | Method and apparatus for determining a downhole fluid sample volume A formation test tool 10 for obtaining a downhole fluid sample from a formation of interest 30 and returning the sample to the surface of a well includes a cylinder 12 forming a fluid sample chamber therein, and a piston 20 sealingly mova... | 01/02/2007 |
| 7156172 | Method for accelerating oil well construction and production processes and heating device therefor Methods are described for providing localized heating in an oil well at precise depths to accomplish or expedite specific objectives. The methods involve the use of a heating tool which can be lowered into an oil well to apply heat at a precise depth to achieve a de... | 01/02/2007 |
| 7156176 | Installation and use of removable heaters in a hydrocarbon containing formation In an embodiment, a system may be used to heat a hydrocarbon containing formation. The system may include a heater placed in an opening in the formation. The system may allow heat to transfer from the heater to a part of the formation. The transferred heat may pyrol... | 01/02/2007 |
| 7150317 | Use of electromagnetic acoustic transducers in downhole cement evaluation A bond log device comprising a sonde, an acoustic transducer, and an acoustic receiver. The acoustic transducer is comprised of a magnet combined with a coil, where the coil is energizable by an electrical current source. The acoustic transducer can also be comprise... | 12/19/2006 |
| 7147059 | Use of downhole high pressure gas in a gas-lift well and associated methods A gas-lift petroleum well and method for producing petroleum products using downhole pressurized gas to provide lift. The gas-lift well having a well casing, a production tubing, a packer, and a gas-lift valve. The well casing extends within a wellbore of the well, ... | 12/12/2006 |
| 7124820 | Exothermic tool and method for heating a low temperature metal alloy for repairing failure spots along a section of a tubular conduit An exothermic well tool and method of use for the repair of failure spots along a section of a first tubular conduit, such as casing, wherein the housing of the tool is heated to at least a temperature approximately in excess of that required to activate and melt an... | 10/24/2006 |
