Proppant and methods of use

Wells – Processes – Placing fluid into the formation

Reexamination Certificate

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C166S280200, C428S375000, C428S407000, C507S269000

Reexamination Certificate

active

07931089

ABSTRACT:
A proppant consists of a core part and shell of a material different from the material of the core part. The shell comprises a soft material attached rigidly to the core part in such a way that the total surface area of the points where the shell and the core part are joined is less than the surface area of the core part.

REFERENCES:
patent: 4547468 (1985-10-01), Jones et al.
patent: 4923714 (1990-05-01), Gibb et al.
patent: 6330916 (2001-12-01), Rickards et al.
patent: 6528157 (2003-03-01), Hussain et al.
patent: 6632527 (2003-10-01), McDaniel et al.
patent: 2006/0258546 (2006-11-01), Brannon et al.

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