Patent classifications
E
FIXED CONSTRUCTIONS
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E21
EARTH OR ROCK DRILLING; MINING
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E21B
EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
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34/00
Valve arrangements for boreholes or wells
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E21B34/10
operated by control fluid supplied from outside the borehole
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E21B34/105
retrievable, e.g. wire line retrievable, i.e. with an element which can be landed into a landing-nipple provided with a passage for control fluid
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E21B34/107
the retrievable element being an operating or controlling means retrievable separately from the closure member, e.g. pilot valve landed into a side pocket
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