Downhole surge pressure reduction and filtering apparatus

Details Downhole surge pressure reduction and filtering apparatus Downhole surge pressure reduction and filtering apparatus

2007-07-16

2009-02-10

Dang, Hoang (Department: 3672)

Wells

Processes

Cementing, plugging or consolidating

C166S157000, C166S177400, C166S236000, C166S242800

Reexamination Certificate

active

07487831

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.

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