Biodegradable surfactant for invert emulsion drilling fluid

C - Chemistry – Metallurgy – 09 – K

Patent

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C09K 8/36 (2006.01)

Patent

CA 2456767

An invert emulsion drilling fluid includes an oleaginous continuous phase; a non-oleaginous discontinuous phase; a biodegradable surfactant including a di- fatty acid ester of triglycerol; and a weighting agent. It is preferred that the fatty acid have the formula RCO2H in which R is an alkyl or akenyl having 10 to 20 carbon atoms. The oleaginous fluid is selected from diesel oil, mineral oil, synthetic oil, ester oils, glycerides of fatty acids, aliphatic esters, aliphatic ethers, aliphatic acetals, or other such hydrocarbons and combinations of these and similar compounds. The non-oleaginous phase is selected from fresh water, sea water, brine, aqueous solutions containing water soluble organic salts, water soluble alcohols or water soluble glycols or combinations of these and similar compounds. The weighting agent is any suitable weighting agent and is preferably selected from water insoluble weighting agents such as barite, calcite, mullite, gallena, manganese oxides, iron oxides, or combinations of these or water soluble weighting agents such as water soluble salts of zinc, iron, barium, calcium or combinations of these and similar compounds.

La présente invention concerne une boue de forage en émulsion inverse comprenant une phase oléagineuse continue, une phase non-oléagineuse discontinue, un tensioactif biodégradable incluant un diester acide gras de triglycérol, et un alourdissant. De préférence, la formule de l'acide gras est RCO¿2?H, R étant un alkyle ou un acényle en C¿10?-C¿20?. Le fluide oléagineux est choisi dans le groupe du gazole, de l'huile minérale, de l'huile de synthèse, des huiles-esters, des glycérides d'acides gras, des esters aliphatiques, des éthers aliphatique, des acétals aliphatiques, et d'autres tels hydrocarbures et leurs combinaisons, avec éventuellement des composés similaires. La phase non-oléagineuse et choisie dans le groupe formé par l'eau fraîche, l'eau de mer, les saumures, les solutions aqueuses contenant des sels organiques hydrosolubles, les alcools et glycols hydrosolubles ou leurs combinaisons, avec éventuellement des composés similaires. L'alourdissant, qui et n'importe quel alourdissant approprié, est choisi de préférence dans le groupe formé par les alourdissants insolubles tels que la baryte, la calcite, la mullite, la galène, les oxydes de manganèse, les oxydes de fer, ou certaines de leurs combinaisons ou des alourdissants hydrosolubles tels que les sels hydrosolubles de zinc, de fer, de baryum, de calcium, ou certaines de leurs combinaisons et composés similaires.

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