Hydraulic pipe string vibrator for reducing well bore friction
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United States of America Patent
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Jan 30, 2018
Issued Date -
N/A
app pub date -
Jun 5, 2015
filing date -
Jun 5, 2014
priority date (Note) -
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Abstract
A friction reduction apparatus (FRA) positioned onto a pipe string comprises a tubular housing, upper and lower mandrels having variously configured fluid flow passages and ports, a valve and a shifter. Fluid travelling through the apparatus causes the valve and shifter to reciprocate, repeatedly opening and closing flow passages. Each of these cycles creates a pulse in the fluid column creating vibrations that reduce friction in the pipe string. The FRA can be used in conjunction with a ball or dart activated tool positioned downhole from the FRA.
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