Spring bow, centralizer, and related methods
Patent
·
OSTI ID:6482832
This patent describes a centralizer for well casing to function in an annular space between the casing and a wellbore, the centralizer having a longitudinal central axis, the wellbore having an upper edge at an upper wellbore opening. The centralizer consists of: a pair of spaced-apart and aligned collar means adapted to encircle the casing, a plurality of spring bows extending between and secured to the collar means, each bow having two ends and a bow mid-portion curved outwardly from the longitudinal central axis of the centralizer, the bows disposed so that a bow part of the bow mid-portion is at a bow angle with respect to the upper edge of the wellbore upon insertion of the centralizer into the wellbore, at least one of the bows having at least one contact angle reduction member, the contact angle reduction member comprising a member protruding from the bow part, the contact angle reduction member protruding outwardly with respect to the longitudinal central axis of the centralizer, the contact reduction member contacting the upper edge of the wellbore at a contact angle which is smaller than the bow angle.
- Assignee:
- Weatherford U.S., Inc., Houston, TX
- Patent Number(s):
- US 4787458
- OSTI ID:
- 6482832
- Country of Publication:
- United States
- Language:
- English
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