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5756926 |
In one aspect of the invention, an environmentally insensitive initiator, including: an electro-explosive device responsive to an electrical signal of unique voltage and frequency applied to the electro-explosive device, the unique volta...
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5540293 |
An explosive or combustion actuated subsurface well tool includes a firing head for initiating operation of the tool in response to a projectile, such as a ball or go-devil, being pumped down a tubing string extending from the surface. T...
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4889183 |
The invention provides a perforating assembly and a method and apparatus for retaining shaped charges in a charge carrier. A shaped charge body has two clips associated with it: a band clip having a plurality of radially extending tabs o...
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4088368 |
A hard compact material, such as rock, is broken by delivering an explosive into at least one hole which has been pre-drilled in the material to be broken and by forcing a relatively incompressible fluid, such as water, into the hole to ...
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3791449 |
Method and apparatus for displacing drilling fluids from between axially spaced well packers in a multiple string well. A telescoping displacement joint may be attached at the lower end of the string which passes through both packers. Th...
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3716426 |
For the expulsion of radioactive indicators from tracer cavities in drill tools for deep wells and similar boreholes propellants are used which do not react with the water of the circulating drilling fluid in stoichiometric proportions. ...
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3511538 |
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3274933 |
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3266845 |
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3247914 |
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3216320 |
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3209650 |
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3072054 |
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2919646 |
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2884836 |
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2873804 |
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2843041 |
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2638323 |
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2408419 |
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2329405 |
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2307729 |
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2292670 |
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2262925 |
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2253851 |
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2090304 |
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1585664 |
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1396625 |
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