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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Jul 23, 2002
Grant Date -
N/A
app pub date -
Aug 1, 2000
filing date -
Aug 1, 2000
priority date (Note) -
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status (Latency Note)
Importance
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 comprised of water, a density increasing water soluble salt, a fluid loss control agent, a hydratable polymer solid suspending agent and a particulate solid bridging agent which is soluble in an aqueous ammonium salt solution. Thereafter, the filter cake deposited by the drilling or servicing fluid is contacted with a clean-up solution comprised of water and an ammonium salt for a period of time such that the bridging agent is dissolved thereby.
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