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1992-08-12
Drilling method and apparatus
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1989-04-26
Borehole logging method and apparatus
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1987-10-05
Hydraulic drilling apparatus and method
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1993-07-30
Well logging apparatus and method
EP0261825A3
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1989-08-23
Method and apparatus for acoustic logging of boreholes
EP0256796A3
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1988-09-21
Method and apparatus for controlled directional drilling of boreholes
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1993-09-15
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1991-07-31
Method and apparatus for logging spontaneous potential
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1987-10-22
Hydraulic drilling apparatus and method
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1991-10-23
Drill and method for using the same
AU630154B2
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1992-10-22
Method and apparatus for measuring the resistivity of earth formations
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1992-01-15
Method and apparatus for manipulating well bore liner
DE3362403D1
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1986-04-10
Method and apparatus for earth drilling
AU5053090A
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1990-10-04
Fluid additive and method for treatment of subterranean formations
IL66073A
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1986-04-29
Earth drilling devices and method
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1989-12-13
Rock drilling apparatus and method
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1991-11-27
Method and apparatus for drilling and coring
MX160919A
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1990-06-19
EARTH WELL DRILLING APPARATUS AND METHOD FOR FORMING IT
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1989-08-30
Drill hole filling method and apparatus
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1991-12-04
Method and apparatus for the recovery of formation fluids subterranean well bore
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1989-11-22
Method and apparatus for the extraction of petroleum
ZA917958B
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1992-06-24
Method of drilling holes in rock
EP0100230A3
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1985-05-15
Earth drilling apparatus and method
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1984-08-29
Earth drilling apparatus and method
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1990-07-25
Method and apparatus for drilling for the study and exploitation of the sub-soil