Method of releasing stuck pipe or tools and spotting fluids therefor
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United States of America Patent
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Nov 21, 2000
Issued Date -
N/A
app pub date -
Feb 9, 1999
filing date -
Jul 24, 1998
priority date (Note) -
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Abstract
Aphron-containing spotting fluids and their use in releasing pipe or tools stuck in the filter cake on the sides of a borehole are disclosed. The spotting fluids comprise a liquid, either aqueous, oleaginous, or mixtures thereof, a viscosifier which imparts a low shear rate viscosity to the fluids of at least 10,000 centipoise, an aphron-generating surfactant, and aphrons. The spotting fluids are used in a conventional method of releasing pipes or tools stuck in the filter cake on the sides of a borehole during conventional drilling or well servicing operations.
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