Method of releasing stuck pipe or tools and spotting fluids...

E - Fixed Constructions – 21 – B

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E21B 31/03 (2006.01) C09K 8/02 (2006.01) E21B 31/00 (2006.01)

Patent

CA 2359703

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.

L'invention concerne des fluides pour spotting contenant des aphrons et leur utilisation dans le dégagement de tuyau ou d'outils coincés dans le cake de filtration sur les parois d'un trou de forage. Ces fluides pour spotting contiennent un liquide aqueux ou oléagineux, ou des mélanges dérivés; un améliorant de viscosité qui transmet une viscosité à faible vitesse de cisaillement aux fluides d'au moins 10 000 centipoises; un tensioactif générant des aphrons; et des aphrons. Lesdits fluides sont utilisés dans un procédé classique permettant de dégager des outils ou des tuyaux coincés dans le cake de filtration sur les parois d'un trou de forage pendant les opérations classiques de forage ou d'entretien de puits.

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