Method of releasing stuck pipe or tools and spotting fluids therefor
February 9, 2019. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2808887 3246696 3328295 Additive composition for release of stuck drill pipe Use of mono and polyalkylene glycol ethers as agents for the release of differentially stuck drill pipe Downhole drilling spotting fluid composition and method Hydrocarbon invert emulsions for use in well drilling operations Foamable drilling fluid and methods of use in well drilling operations Aphron-containing well drilling and servicing fluids Method of increasing the LSRV of aqueous fluids and oil-in-water emulsions prepared thereby Patent #: 5977030 InventorsApplicationNo. 246934 filed on 02/09/1999US Classes:166/301, Freeing stuck object, grappling or fishing in well175/69, Combined liquid and gaseous fluid507/102, Contains intended gaseous phase at entry into wellbore507/202, Contains intended gaseous phase at entry into wellbore507/910, EARTH BORING FLUID DEVOID OF DISCRETE AQUEOUS PHASE507/940FREEING STUCK OBJECT FROM WELLBOREExaminersPrimary: Suchfield, George A.Attorney, Agent or FirmInternational ClassesC09K 007/02C09K 007/06 E21B 031/00 E21B 031/03 AbstractAphron-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.Field of SearchFreeing stuck object, grappling or fishing in wellBoring with specific fluid Combined liquid and gaseous fluid Contains intended gaseous phase at entry into wellbore Contains intended gaseous phase at entry into wellbore EARTH BORING FLUID DEVOID OF DISCRETE AQUEOUS PHASE FREEING STUCK OBJECT FROM WELLBORE |
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