Wells – Expansible anchor or casing – With wedge or cam and friction drag
Patent
1995-12-06
1997-04-29
Dang, Hoang C.
Wells
Expansible anchor or casing
With wedge or cam and friction drag
166217, E21B 2300
Patent
active
056239912
ABSTRACT:
A tubing tightener which is readily adaptable to either clockwise or anti-clockwise rotational setting operation and which uses a series of drag slips having integral drag and slip surface regions. The drag surface regions are substantially smooth and are advanced into contact with a wellbore with the slip surface regions retracted, when the tightener is in its unlocked orientation. The slip surface regions are serrated to provide a positive engagement with the wellbore and are advanced into engagement with the wellbore with the drag surface regions retracted, when the tightener is in its locked orientation. The drag slips are caused to rock about a point of contact between the drag slip surfaces and the wellbore, located intermediate the drag and slip surface regions, in order to advance the appropriate surface region of each drag slip into engagement with the wellbore. The invention provides for a compact, lightweight construction with improved reliability and increased bypass around the tightener.
REFERENCES:
patent: 1617303 (1927-02-01), Dougherty
patent: 2038262 (1936-04-01), Bernhardt
patent: 2665888 (1954-01-01), Claypool et al.
patent: 3296900 (1967-01-01), Behnke
patent: 3322006 (1967-05-01), Brown
patent: 3380528 (1968-04-01), Timmons
patent: 4499799 (1985-02-01), Bordages
patent: 5275239 (1994-01-01), Obrejanu
Dang Hoang C.
Northwest Tech Group Inc.
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