|
US2682800A
|
|
Photoelectric water locating instrument
|
|
US2573172A
|
|
Tank bleeder
|
|
US2617299A
|
|
Apparatus for measuring oil and water production of wells
|
|
US2228623A
|
|
Method and means for locating perforating means at producing zones
|
|
US2317039A
|
|
Method and apparatus for determining water leakages into wells
|
|
US2216189A
|
|
Method and apparatus for inserting cores in cables
|
|
US2249815A
|
|
Apparatus for testing and sampling well fluid
|
|
US2414194A
|
|
Method of and apparatus for locating formations in cased wells
|
|
US2297754A
|
|
Method of locating strata in wells and electrode apparatus therefor
|
|
US2184338A
|
|
Method of and apparatus for locating water leakages into wells
|
|
US2397255A
|
|
Method of and apparatus for electrically determining the formation in wells
|
|
US2190260A
|
|
Apparatus for determining pressure and temperature in a well
|
|
US2141179A
|
|
Timed dump bailer
|
|
US2397254A
|
|
Method and apparatus for electrically coring in cased boreholes
|
|
US2283429A
|
|
Method of and apparatus for determining the location of water strata in wells
|
|
US1994762A
|
|
Electrolyte for use in testing wells
|
|
US1994761A
|
|
Solution for use in testing wells
|
|
US1889889A
|
|
Method of testing open wells
|
|
US1865847A
|
|
Method of locating the point of entry of water into oil wells
|
|
US1829946A
|
|
Hydraulic shock absorber
|
