Fracturing method providing simultaneous flow back

Details Fracturing method providing simultaneous flow back Fracturing method providing simultaneous flow back

2007-10-09

2007-10-09

Bagnell, David (Department: 3672)

Wells

Processes

Placing fluid into the formation

C166S297000, C166S298000, C166S305100, C166S312000

Reexamination Certificate

active

11072725

ABSTRACT:
A bottom-up method of fracturing a multi-zone subterranean formation intersected by a wellbore that enables one zone to be fractured while at the same time flowing previously placed fracture fluid from one or more other zones back to the surface is provided. The method employs a bottom-hole assembly (“BHA”) that is attached to the bottom end of a tubing string. The BHA includes a hydra jetting sub, a centralizer, a packer and valve sub. The hydra jetting sub is used to perforate and initiate the fracture in the zones of interest. The zones are fractured by pumping fracturing fluid down the annulus formed between the tubing string and the wellbore. The previously placed fracture fluid flows back to the surface through the tubing string. It enters through the valve sub in the BHA.

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