| US 7,472,746 B2 | ||
| Packer apparatus with annular check valve | ||
| Gary Allan Maier, Calgary (Canada) | ||
| Assigned to Halliburton Energy Services, Inc., Duncan, Okla. (US) | ||
| Filed on Mar. 31, 2006, as Appl. No. 11/394,915. | ||
| Prior Publication US 2007/0235194 A1, Oct. 11, 2007 | ||
| Int. Cl. E21B 33/12 (2006.01) | ||
| U.S. Cl. 166—129 [166/127; 166/148; 166/186; 166/191; 166/305.1; 166/387] | 29 Claims |
| 1. A well packer assembly comprising:
a plurality of first packer elements supported on a first tubular mandrel for sealing against a wellbore above a formation
to be stimulated;
a ported sub positioned below the plurality of first packer elements;
a second tubular mandrel defining a central flow passage for communicating stimulation fluid to the ported sub, wherein the
first and second tubular mandrels define a fluid bypass for communicating fluid in a well annulus above the plurality of first
packer elements to a well annulus below the first packer elements;
a plurality of second packer elements for sealing against the wellbore below the formation; and
a valve for permitting one-way flow from the fluid bypass into the well annulus between the plurality of first packer elements
and the plurality of second packer elements and blocking flow in the opposite direction.
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