Drilling head with non-rotating annular seal assembly
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United States of America Patent
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Jan 29, 2019
Grant Date -
Feb 1, 2018
app pub date -
Jul 28, 2016
filing date -
Jul 28, 2016
priority date (Note) -
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status (Latency Note)
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Abstract
A drilling head can include an annular seal assembly releasably secured in an outer housing, the annular seal assembly including an annular seal and an actuator that pressurizes a lubricant for delivery to an interior of the annular seal. A method can include positioning an annular seal in a drilling head, the annular seal including an inner liner having openings formed through a sidewall of the inner liner, and flowing a lubricant into an opening while the inner liner sealingly engages a tubular. In another method, the annular seal can have a minimum inner diameter for sealing engagement with a tubular, and a lubricant passage extending through the annular seal and intersecting an interior of the annular seal at a location spaced apart from the minimum inner diameter. A lubricant is flowed through the lubricant passage to the interior of the annular seal.
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