Borehole treatment agent containing low toxic oil phase

C - Chemistry – Metallurgy – 09 – K

Patent

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Details

C09K 8/36 (2006.01) C09K 8/34 (2006.01)

Patent

CA 2499667

The invention relates to borehole treatment agent containing an aqueous phase and a non-aqueous oil phase, emulsifiers and, optionally, other usual additives, such as loading agents, fluid-loss additives, viscosity regulating additives, wetting agents, salts, bio targets, corrosion inhibitors, and/or an alkali reserve. The non-aqueous phase is completely or partially selected from the group which contains a) paraffin having 5 - 22 C-atoms and /or b) internal olefins having 12 - 30 C-atoms per molecule respectively in a mixture with c) carboxylic acid esters of general formula R-C00-R' wherein R represents a linear or branched, saturated or unsaturated alkyl radical having 15 - 25 C- atoms and R' represents a saturated, linear or branched alkyl radical having 3 - 22 C atoms. The invention is characterised in that the quotient of the toxicity of internal olefins of chain length C16/C18 (Standard 10) and the toxicity of the components of the non aqueous phase, measured according to the Leptocheirus plumulosus acute, static 96-hour/10 day sediment toxicity test (according to ASTM E 1367 - 92 & EPA/60018-94/025, section 11), is less than 1.

L'invention concerne un produit de traitement de trous de forage contenant une phase aqueuse et une phase huileuse non aqueuse, des émulsifiants et éventuellement d'autres additifs comme, par exemple, un agent alourdissant, des additifs de filtrat, des additifs régulateurs de viscosité, des agents mouillants, des sels, biocides, inhibiteurs de corrosion et/ou une réserve alcaline, la phase non aqueuse étant sélectionnée en totalité ou en partie dans le groupe a) des paraffines ayant 5 à 22 atomes de carbone et/ou b) des oléfines internes ayant 12 à 30 atomes de carbone dans la molécule respectivement en mélange avec c) des esters d'acide carboxylique de la formule générale R-C00-R' où R représente un alkyle linéaire ou ramifié, saturé ou non saturé ayant 15 à 25 atomes de carbone et R' représente un alkyle saturé, linéaire ou ramifié ayant 3 à 22 atomes de carbone. L'invention est caractérisée en ce que le quotient de la toxicité d'oléfines internes de la longueur de chaîne C16/C18 (standard IO) et de la toxicité des constituants de la phase non aqueuse qui sont respectivement mesurées selon le test de toxicité des sédiments 96-heures/10 jours statique Leptocheirus plumulosus aigu (selon ASTM E 1367 - 92 & EPA/60018-94/025, section 11), est inférieur à 1.

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