Methods, well cement compositions and lightweight additives therefor
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United States of America Patent
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Oct 14, 2003
Grant Date -
Jun 5, 2003
app pub date -
Mar 21, 2002
filing date -
Dec 3, 2001
priority date (Note) -
In Force
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Abstract
The present invention provides methods, lightweight well cement compositions and additives for the well cement compositions. The methods of the invention for sealing pipe in a well bore penetrating a zone or formation which readily fractures at low hydrostatic pressure is basically comprised of the steps of providing a lightweight cement composition comprised of a hydraulic cement, water and an additive comprising an aqueous suspension of microspheres containing a water swellable clay suspending agent, placing the cement composition in the annulus between the pipe and the well bore and allowing the cement composition to set.
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