Wells – Processes – With indicating – testing – measuring or locating
Patent
1983-03-09
1985-07-30
Suchfield, George A.
Wells
Processes
With indicating, testing, measuring or locating
166290, 166291, 166297, E21B 33138, E21B 4704
Patent
active
045315833
ABSTRACT:
A method for use in a cased well bore for placing cement in a vertical channel existing in the annulus between the casing and a well bore to seal off vertical channels in a prior cement job. In the method, where a vertical channel exists, the interval of the casing along the vertical channel is perforated circumferentially with the perforations at 15.degree. angles with respect to one another about a vertical axis. The perforations number can be as many as twenty-four over a six foot interval. The interval of the casing is located near a water bearing formation and between permeable zones. A known volume of cement is then pumped through the perforations and into the vertical channel to seal off the annulus between the casing and the well bore and excess cement is reverse circulated out of the well bore.
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Keller, S. R. et al., "Problems Associated with Deviated-Wellbore Cementing", SPE 11979, Presented at the 58th Annual Technical Conference and Exhibition Held in San Francisco, CA, Oct. 5-8, 1983.
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Tomorrow's Tools Today, Published by the Lane-Wells Company, vol. V, No. 11, Oct. 1939.
Beard William J.
Halliburton Company
Suchfield George A.
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