Removal of oil and chloride from oil contaminated material

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 37/06 (2006.01) B09C 1/02 (2006.01) C09K 3/32 (2006.01) E21B 21/06 (2006.01)

Patent

CA 2355676

A method for chemically removing hydrocarbons from oil contaminated material is described. The method comprises contacting the material containing the oil with a combination of surfactants in an oil carrier similar to or identical to the oil to be removed. This process avoids the use of water. Therefore the process does not compromise the quality of the oil by having water as a contaminant and thus eliminating the possibility of oil contaminated water getting into the environment. In certain examples, when the process is used to remove oil from land based well bore cuttings, the processed well bore cuttings contain high levels of chlorides, which is an environmental problem. In such examples the method also includes contacting the well bore cuttings with a solution of dioctyl sodium sulfosuccinate in water to reduce the chloride concentration. An apparatus designed for this purpose is also described.

Cette invention concerne un procédé de récupération chimique d'hydrocarbures dans des matériaux contaminés par du pétrole. Ce procédé consiste à mettre le matériau contenant du pétrole en contact avec une combinaison de tensioactifs dans excipient de pétrole qui est similaire ou identique au pétrole devant être récupéré. Ce procédé permet d'éviter l'utilisation d'eau et ne détériore pas la qualité du pétrole en le contaminant avec de l'eau, ce qui permet également d'éliminer toute possibilité que de l'eau contaminée par du pétrole ne s'échappe dans le milieu environnant. Dans certains exemples et lorsque le procédé est utilisé afin de récupérer du pétrole dans des déblais de puits de forage à terre, les déblais de forage traités possèdent de fortes teneurs en chlorures qui posent un problème sur le plan écologique. Dans de tels cas, ce procédé consiste également à mettre les déblais de forage en contact avec une solution aqueuse de sulfosuccinate de sodium de dioctyle de manière à réduire la concentration en chlorures. Cette invention concerne également un appareil destiné à cette fin.

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