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Downhole depth correlation
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Patent number 6,151,961
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Issue date Nov 28, 2000
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Schlumberger Technology Corporation
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Klaus B. Huber
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E21 - EARTH DRILLING MINING
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Mechanical shut-off valve
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Patent number 6,085,843
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Issue date Jul 11, 2000
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Schlumberger Technology Corporation
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A. Glen Edwards
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E21 - EARTH DRILLING MINING
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Detonating cord cutter
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Patent number 6,049,985
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Issue date Apr 18, 2000
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Schlumberger Technology Corporation
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Manuel T. Gonzalez
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B26 - HAND CUTTING TOOLS CUTTING SEVERING
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Downhole tubing conveyed valve
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Patent number 5,865,254
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Issue date Feb 2, 1999
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Schlumberger Technology Corporation
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Klaus B. Huber
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E21 - EARTH DRILLING MINING
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