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7004247 |
Conductor-in-conduit heat sources for in situ thermal processing of an oil shale formation
An oil shale formation may be treated using an in situ thermal process. Hydrocarbons, H 2 , and/or other formation fluids may be produced from the formation. Heat may be applied to the formation...
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6929067 |
Heat sources with conductive material for in situ thermal processing of an oil shale formation
The oil shale formation may be treated using an in situ thermal process. Heat may be provided to a section of the formation from one or more heat sources. A portion of a heat source may include...
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6838425 |
Cleaning compositions containing multiply-substituted protease variants
The present invention relates to cleaning compositions comprising a protease variant. One cleaning composition comprises a protease variant including a substitution of an amino acid residue with...
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6831053 |
Bleaching compositions comprising multiply-substituted protease variants
The present invention relates to bleaching compositions comprising a protease variant. One bleaching composition comprises a protease variant including a substitution of an amino acid residue with...
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6343652 |
Method and device for cleaning out a well or piping blocked with gas hydrates
A method and apparatus for unplugging a well or pipe obstructed by a gas hydrates. According to the invention, a moving heating element is applied against one end of the hydrate plug, and is...
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6269876 |
Electrical heater
A heater is disclosed, the heater including: a porous metal sheet heating element; and an electrical insulating material surrounding the porous metal sheet heating element; wherein there is no...
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6009940 |
Production in frigid environments
A method and apparatus for producing (e.g. heavy oil) through a wellbore which passes through a permafrost layer. To maintain an acceptable flow temperature inside the production tubing, a heating...
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5782301 |
Oil well heater cable
A heater cable is strapped alongside tubing in a well to heat the production fluids flowing through the tubing. The heater cable has three copper conductors surrounded by a thin electrical...
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5623576 |
Downhole radial flow steam generator for oil wells
A downhole radial flow steam generator for oil wells that includes an annular casing and a water passage extending therethrough with a porous medium between the casing and passage with electrode...
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5517593 |
Control system for well stimulation apparatus with response time temperature rise used in determining heater control temperature setpoint
A control system for well stimulation equipment including a source of electrical power, a source of injection fluid, a fluid injection system, and a downhole electrical heater, electrically...
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5400430 |
Method for injection well stimulation
A method of stimulating injection wells having a wellbore. The method includes the steps of placing a heater at or near the bottom of the well, adjacent to the area to be treated, energizing the...
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5282263 |
Method of stumulating oil wells by pumped solvent heated in situ to reduce wax obstructions
A method of stimulating production from an oil well by removing solid wax deposits from a production zone an electrical resistance heater comprised of a packed bed of spherical heating elements...
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5247994 |
Method of stimulating oil wells
This invention describes a method of stimulating production from an oil well by removing solid wax deposits from a production zone. An electrical resistance heater comprised of a packed bed of...
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5120935 |
Method and apparatus for oil well stimulation utilizing electrically heated solvents
A method and apparatus of stimulating production from an oil well by removing solid wax deposits from a production zone, includes an electrical resistance heater comprised of a packed bed of...
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4704514 |
Heating rate variant elongated electrical resistance heater
An electrical resistance heater capable of generating heat at different rates at different locations along its length comprises a continuous and unitary electrical conductor having a thickness...
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4570715 |
Formation-tailored method and apparatus for uniformly heating long subterranean intervals at high temperature
Long intervals of subterranean earth formations are heated at high temperatures for long times with an electrical heater containing spoolable, steel sheathed, mineral insulated cables which have...
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3981187 |
Method for measuring the thermal conductivity of well casing and the like
A method for measuring the thermal conductivity of well casing in situ. The instrument consists of a probe several feet in length lowered into a well and decentralized so that it maintains contact...
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3864969 |
STATION MEASUREMENTS OF EARTH FORMATION THERMAL CONDUCTIVITY
An illustrative embodiment of the invention provides two methods for making station measurements of earth formation thermal conductivity. In one method the formation is heated for a predetermined...
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3163745 |
Heating of an earth formation penetrated by a well borehole
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2942461 |
Well bore hole logging
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