Well drilling and servicing fluids and methods of removing filter cake deposited thereby
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United States of America Patent
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-
Dec 17, 2002
Grant Date -
Mar 28, 2002
app pub date -
Jan 9, 2001
filing date -
Aug 1, 2000
priority date (Note) -
In Force
status (Latency Note)
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Abstract
Well drilling and servicing fluids for use in producing formations and methods of removing filter cake therefrom are provided. The methods basically comprise using a drilling or servicing fluid basically comprised of water, a water soluble salt and a particulate solid bridging agent selected from magnesium oxychloride cement, magnesium oxysulfate cement, magnesium potassium phosphate hexahydrate, magnesium hydrogen phosphate trihydrate and magnesium ammonium phosphate hexahydrate. Thereafter, the filter cake deposited by the drilling or servicing fluid is contacted with an aqueous clean-up solution for a period of time such that the bridging agent is dissolved thereby.
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