| US 7,472,751 B2 | ||
| Method of treating subterranean formations using mixed density proppants or sequential proppant stages | ||
| Harold Dean Brannon, Magnolia, Tex. (US); William Dale Wood, Spring, Tex. (US); Randall Edgeman, Midland, Tex. (US); Allan Ray Rickards, Tomball, Tex. (US); Christopher John Stephenson, Houston, Tex. (US); Doug Walser, Midland, Tex. (US); and Mark Malone, Midland, Tex. (US) | ||
| Assigned to BJ Services Company, Houston, Tex. (US) | ||
| Filed on Feb. 20, 2007, as Appl. No. 11/708,597. | ||
| Application 11/708597 is a continuation of application No. 10/803258, filed on Mar. 18, 2004, granted, now 7,210,528. | ||
| Claims priority of provisional application 60/455717, filed on Mar. 18, 2003. | ||
| Claims priority of provisional application 60/508822, filed on Oct. 03, 2003. | ||
| Prior Publication US 2008/0032898 A1, Feb. 07, 2008 | ||
| This patent is subject to a terminal disclaimer. | ||
| Int. Cl. E21B 43/46 (2006.01) | ||
| U.S. Cl. 166—280.1 [166/308.1] | 26 Claims |
| 1. A method of fracturing a subterranean formation comprising:
pumping a pad fluid into the formation at a pressure sufficient to initiate a fracture;
introducing a first proppant stage into the fracture, the first proppant stage containing an ultra lightweight (ULW) proppant
having a density less than or equal to 2.45 g/cc; and
introducing a second proppant stage into the fracture, the second proppant stage containing an ultra lightweight (ULW) proppant
having a density less than or equal to 2.45 g/cc, wherein the density of the second proppant stage is greater than the density
of the first proppant stage.
|