Low-density ball sealer for use as a diverting agent in hostile environment wells
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United States of America Patent
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-
Jan 23, 1996
Grant Date -
N/A
app pub date -
Oct 27, 1994
filing date -
Oct 27, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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