Particle-loaded wash for well cleanup

Details Particle-loaded wash for well cleanup Particle-loaded wash for well cleanup

C - Chemistry, Metallurgy

09

K

C09K 8/52 (2006.01) E21B 37/00 (2006.01)

Patent

CA 2738995

The invention consists in loading a chemical wash fluid with solid particles to enhance annulus cleanup prior to placing cement slurries (or during the completion phase). The presence of solid particles in a low-viscosity fluid will induce an abrasive cleanup of all soft material present in the annulus in particular gelled mud and mud cake. There is no need for special hardware and no harm to metallic parts. The particles have a size of at least 100 microns and a density ranging from 0,1 to 2g/cm3.

L'invention concerne le chargement d'un fluide de lavage chimique comportant des particules solides pour améliorer le nettoyage d'un espace annulaire avant la mise en place de pâtes de ciment (ou pendant la phase d'achèvement). La présence de particules solides dans un fluide à faible viscosité induira un nettoyage abrasif de tout le matériau mou présent dans l'espace annulaire, en particulier la boue gélifiée et le cake. Il n'est pas nécessaire d'avoir un matériel particulier et les pièces métalliques ne sont pas endommagées. Les particules ont une taille d'au moins 100 microns et une densité comprise entre 0,1 et 2 g/cm3.

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