Downhole surge pressure reduction and filtering apparatus

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

E - Fixed Constructions

21

B

E21B 33/14 (2006.01) E21B 37/00 (2006.01) E21B 43/02 (2006.01) E21B 43/10 (2006.01)

Patent

CA 2526837

The present invention provides a downhole cementing apparatus (100) run into a borehole on a tubular. The apparatus is constructed on the pipe (110) in such a way that pressure surge during run-in is reduced by allowing fluid to enter the pipe and utilise the fluid pathway of the cement. In one aspect of the invention, a inner member (135) 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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