C - Chemistry – Metallurgy – 09 – K
Patent
C - Chemistry, Metallurgy
09
K
C09K 8/24 (2006.01) C09K 8/12 (2006.01) C09K 8/28 (2006.01) C09K 8/60 (2006.01)
Patent
CA 2656294
There is provided a wellbore fluid having a continuous aqueous phase, and comprising at least one polymer which contains both hydrophilic units and hydrophobic units, at least some of said hydrophilic units containing sulfonate groups, and less than 50 % by weight of said hydrophilic units comprising -CH2.CH2.O- units; and at least some of said hydrophobic units containing pendant alkyl groups having at least 8 carbon atoms. Such aqueous based wellbore fluids exhibit significantly improved fluid loss properties when used in wellbore operations, such as drilling, completion or workover.
La présente invention concerne un fluide de forage comprenant une phase aqueuse continue, et comprenant au moins un polymère qui contient à la fois des unités hydrophiles et des unités hydrophobes, au moins certaines desdites unités hydrophiles contenant des groupes sulfonates, et moins de 50% en poids desdites unités hydrophiles comportant des unités -CH2.CH2.O-; et au moins certaines desdites unités hydrophobes contenant des groupes alkyles pendants ayant au moins 8 atomes de carbone. De tels fluides de forage à phase aqueuse présentent des propriétés de perte de fluide nettement améliorées lors de leur utilisation dans des opérations de puits de forage, telles que le forage, la complétion ou le reconditionnement.
Duncum Simon Neil
Sawdon Christopher Alan
Bp Exploration Operating Company Limited
Fetherstonhaugh & Co.
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