|
US5283520A
|
|
Method of determining thickness of magnetic pipe by measuring the time it takes the pipe to reach magnetic saturation
|
|
US3116419A
|
|
Tracer injector means utilizing a radioactive electrode
|
|
US3079549A
|
|
Means and techniques for logging well bores
|
|
US3020408A
|
|
Nuclear analytical apparatus
|
|
US2866155A
|
|
Apparatus for visually inspecting oil well casings
|
|
US2923824A
|
|
X-ray analysis of geological formations
|
|
US2965757A
|
|
Spectral analysis of materials
|
|
US3223839A
|
|
Apparatus for exploring geological strata utilizing a neutron source and detector
|
|
US2686268A
|
|
Well logging device
|
|
US2716890A
|
|
Apparatus for determining point at which a pipe is stuck in a well
|
|
US2650067A
|
|
Apparatus for logging wells while drilling
|
|
US2607220A
|
|
Means for measuring conditions in deep wells
|
|
US2604049A
|
|
Electrical deepwell pump
|
|
US2530309A
|
|
Device for determining relative movements of parts in wells
|
|
US2433231A
|
|
Externally fired perforating gun
|
|
US2530308A
|
|
Apparatus for determining movability of members in wells
|
|
US2436047A
|
|
Tool indicator
|
|
US2501953A
|
|
Electrical well logging system
|
|
US2568241A
|
|
Apparatus for logging
|
|
US2466251A
|
|
Method of and apparatus for measuring the length of magnetic material
|
