Low-density ball sealer for use as a diverting agent in hostile

Details Low-density ball sealer for use as a diverting agent in hostile Low-density ball sealer for use as a diverting agent in hostile

1994-10-27

1996-01-23

Novosad, Stephen J.

Wells

Processes

Fluid flow causes pellet to block opening in wall of conduit

166193, E21B 33138, E21B 3310, E21B 4327, E21B 4325

Patent

active

054858828

ABSTRACT:
The invention is a rigid, hollow core, low-density ball sealer designed to perform effectively in hostile well environments. It temporarily seals perforations inside cased wells at temperatures up to 400.degree. F. (204.degree. C.), at hydrostatic pressures up to 20,000 psi (137 Mpa), and at differential pressures across the perforations up to 1,500 psi. Ball densities may range from 0.80 to 1.3 gm/cc (or higher). It can withstand the degradation effects of solvents common to oil and gas wells during a workover. Nominal changes in ball density occur during a 24-hour period when exposed to a hostile well environment. The ball sealer is comprised of two pieces made of a high strength material that snap together to form a hollow-core sphere. If necessary, adjustments to ball density can occur subsequent to manufacturing of the ball pieces.

REFERENCES:
patent: 2754910 (1956-07-01), Derrick et al.
patent: 4102401 (1978-07-01), Erbstoesser
patent: 4244425 (1981-01-01), Erbstoesser
patent: 4407368 (1983-10-01), Erbstoesser
patent: 4421167 (1983-12-01), Erbstoesser
patent: 4505334 (1985-03-01), Doner et al.
patent: 4702316 (1987-10-01), Chung et al.
patent: 5253709 (1993-10-01), Kendrick et al.

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