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US2553032A
|
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Coring bit
|
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US2592277A
|
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Bearing for gauge cutters of rotary rock bits
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US2595904A
|
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Tricone rock bit
|
|
US2595903A
|
|
Rock bit radial bearing
|
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US2557619A
|
|
Removable pin installation for well drilling cutter assemblies
|
|
US2384675A
|
|
Apparatus for multiple stage cementing
|
|
US2361094A
|
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Setting tool for use in wells
|
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US2291371A
|
|
Method and apparatus for cementing liners in wells
|
|
GB537396A
|
|
Well pipe joint
|
|
US2196966A
|
|
Well pipe joint
|
|
US2191778A
|
|
Back pressure valve
|
|
US2205119A
|
|
Method of setting drillable liners in wells
|
|
US2252973A
|
|
Method for testing and producing the fluids of the earth formations encountered in wells
|
|
US2160804A
|
|
Method and apparatus for repairing well liners, casings, etc.
|
|
US2249852A
|
|
Process for cementing oil wells
|
|
US2160357A
|
|
Means for setting devices at predetermined levels in well casings and tubings
|
|
US2207345A
|
|
Means and method of cementing wells
|
|
US2173035A
|
|
Method of sidetracking wells
|
|
US2164266A
|
|
Method and apparatus for producing fluid from wells
|
|
US2173033A
|
|
Method and apparatus useful in the production of wells
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