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7086484 |
The present invention relates to methods and apparatus for making in situ thermal property determinations utilizing a heat source employed in wellbore stabilization procedures, well drilling, or well perforating, for example. In particul...
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6880646 |
A method and apparatus for providing fluid flow into a wellbore in which an apparatus having at least one laser energy output is lowered into the wellbore and the at least one laser energy output is directed at a wall of the wellbore. At...
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4491367 |
Subterranean generation of heat as a source of energy optionally accompanied by the production of minerals. In subterranean formations of minerals that are capable of undergoing an enthalpic degradation, such degradation is artificially ...
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4304308 |
A method and apparatus for making holes in coal seams in a coal mining system in which hot working gas is employed to impinge on the coal under high pressure and speed in order to disintegrate it and particularly for making inclined or h...
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4301875 |
A method and apparatus for making holes in coal seams in a coal mining system in which hot working gas is employed to impinge on the coal under high pressure and speed in order to disintegrate it and particularly for making inclined or h...
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4227582 |
A method and apparatus for perforating a well casing and surrounding formation are disclosed. The perforating apparatus includes a laser source for projecting a high intensity laser beam transversely through the well bore and surrounding...
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4168752 |
There is provided in accordance with the invention apparatus and a method for boring holes through carbonaceous deposits. The method involves the step of introducing combustion-supporting gases such as air under pressure through the appa...
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3990835 |
A technique is described for igniting the oil shale rubble pile in an in situ oil shale retort. A gas-air burner is lowered through a hole to a plenum over the oil shale to be ignited. An excess of air is passed through the hole and arou...
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3856084 |
An improvement in the method for gasifying subterranean carbonaceous deposits by injecting oxygen-containing gas into such deposits through an injection pipe positioned in a wellbore penatrating the deposits, gasifying the carbonaceous m...
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3563606 |
Subsurface combustible material, such as coal, can be burned in situ by providing a number of passages which extend downwardly from the surface and which extend to, and generally horizontally through, the combustible material, by forming...
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3001776 |
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3001775 |
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2970826 |
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2967052 |
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2958519 |
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2923535 |
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2917296 |
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2899186 |
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2841375 |
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2833516 |
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2788956 |
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2786660 |
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2780450 |
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2780449 |
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2777679 |
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2695163 |
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2688464 |
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2680487 |
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2680486 |
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2497868 |
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2471695 |
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0219181 |
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