Drillstem motion apparatus, especially for the execution of continuously operational deepdrilling
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United States of America Patent
Stats
-
Apr 5, 1988
Grant Date -
N/A
app pub date -
Jun 26, 1986
filing date -
Sep 4, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A rotary drilling apparatus is disclosed, in which the pipe string is both lifted and lowered, as well as rotated, by an opposed pair of endless chains, eliminating the need for a high drilling tower structure. An advantageous form of gripping mechanism, attached to the chain links, enables the pipe string to be gripped with extremely heavy force, with the gripping means automatically confirming to pipe diameters of a variety of sizes and also conforming to the pipe coupling elements, as well as to the pipe areas inbetween, so that manipulation of the pipe string can be continuous. The gripping assembly includes a plurality of articulated gripping elements supported at each end by pivoted support arms. This assembly is urged against the pipe string by high pressure, hydraulic pistons.
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