Cement compositions comprising improved lost circulation...

Wells – Processes – Cementing – plugging or consolidating

Reexamination Certificate

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C106S696000, C106S724000, C106S802000, C106S823000, C166S292000, C166S295000, C405S129350, C588S252000, C588S255000

Reexamination Certificate

active

06902002

ABSTRACT:
The present invention relates to subterranean cementing operations and, more particularly, to cement composition that include improved lost circulation materials, and methods of using such cement compositions in subterranean formations. In certain exemplary embodiments, the improved lost circulation materials include inelastic particles of polyethylene, polystyrene and/or polypropylene. Optionally, the cement compositions also may include additives such as fly ash, a surfactant, a dispersant, a fluid loss control additive, a conventional lost circulation material, an generator, a retarder, a salt, a mica, fiber, a formation-conditioning agent, fumed silica, bentonite, expanding additives, microspheres, weighting materials, or a defoamer.

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Baroid brochure entitled “STOP-FRAC™ S Lost Circulation Material” dated 2002.
Baroid brochure entitled “WALL-NUT™ Lost Circulation Additive” dated 2002.

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