Oil removing method of oil-base drilling cuttings

Abstract

The invention relates to an oil removing method of oil-base drilling cuttings. The method comprises the steps of feeding an emulsifying agent and acid into a solution of oily drilling cuttings, carrying out low-shear mixing for a period of time, and gradually separating hydrocarbon substances from the drilling cuttings to form small liquid drops, wherein the emulsifying agent has hydrophilia and comprises dispersed liquid drops, so that the effect of oil in water can be achieved; then, feeding active silicate, adjusting the pH value, and carrying out low-shear mixing to enable silicate to act with hydrogen ions to generate silicic acid, wherein silicic acid can be separated out from the solution due to the very low solubility; attaching silicic acid on the emulsified oil drops under the action of mixing to package the oil drops and form microcapsules, wherein the densities of the microcapsules are larger than the density of the solution, so that the microcapsules deposit at the bottom of the solution, and the aim of removing oil is achieved. According to the treatment method of the oil-base drilling fluid drilling cuttings, the cost is low, the oil removal rate is high and the technology is simple; according to the method, the problem of pollution caused by the drilling cuttings can be solved, the oil resources are recovered, and economical and effective innocent treatment is realized, and therefore, the oil removing method has a certain industrial popularization value.

Description

technical field [0001] The invention relates to the technical field of harmless treatment of oil-based drilling fluid drilling cuttings, in particular to a method for removing oil components from oily drilling cuttings. Background technique [0002] The main harmful components of oil-based drilling fluid drilling cuttings are heavy metal ions, petroleum hydrocarbons, organic matter, etc., which have a serious impact on the ecological environment and are difficult to treat. The harmless treatment of crumbs has become a matter of urgency. [0003] Foreign countries have strict regulations on the oil content of drilling cuttings. Since 1993, Europe has required that the content of oil in solid waste should be less than 1%, and after November 2000, it has reached zero discharge. Although my country has not clearly stipulated the mineral oil content standard in drilling waste, it has listed mineral oil waste as hazardous waste, and the oil content in agricultural sludge is contr...

AI Technical Summary

Problems solved by technology

The cost of heat treatment is high; the oil removal effect of drill cuttings cleaning technology is limited, and it will cause problems in the treatment of oily sewage; the incineration method requires incineration equipment, the treatment cost is expensive, and the flue gas released pollutes the atmosphere; biological treatment does not remove oily drill cuttings The effective utilization of oil resources in China and the relatively long processing cycle, these methods have disadvantages such as poor efficiency, high cost, and complicated processes.

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