Downhole surge pressure reduction and filtering apparatus
AssigneeWeatherford/Lamb, Inc.
InventorsClayton Pluchek, Gerald Pedersen, Richard Giroux, Thad Scott, David Haugen
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Abstract
The present invention provides a downhole cementing apparatus run into a borehole on a tubular. The apparatus is constructed on the pipe in such a way that pressure surge during run-in is reduced by allowing fluid to enter the pipe and utilize the fluid pathway of the cement. In one aspect of the invention, an inner member is provided that filters fluid as it enters the fluid pathway. In another aspect of the invention, various methods are provided within the cementing apparatus to loosen and displace sediment in the borehole prior to cementing.
Claims17
A tool for use in a tubular string comprising:
- a non-perforated tubular inner member having first and second ends;
- and
- a tubular outer member having an end and upper and lower portions.
Dependencies are inferred from the claim text.