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Process and apparatus for cleaning particulate solids
| Details |
Inventors: Flanigan, David A.; Heilhecker, Joe K.; Williams, Robert E.;
Assignee: Conoco Inc. (Ponca City, OK)
Primary Examiner: Pal; Asok
Assistant Examiner:
Attorney, Agent or Firm:
A system for cleaning solids contaminated with solvent-soluble contaminants. The system, which includes both process and apparatus, comprises slurrying of the solids with a solvent, feeding the slurry to a cyclone separation zone integrally connected to a countercurrent extraction zone, separating the slurry into an overflow stream which includes solvent and fine particles of solids and an underflow stream which includes mostly coarse particles of solids in the cyclone separation zone, processing the overflow stream in a cleaning zone with additional solvent, processing the underflow stream in countercurrent relationship with additional solvent through the countercurrent extraction zone, combining the cleaned coarse particles of solids withdrawn from the extraction zone with the cleaned fine particles of solids withdrawn from the cleaning zone and centrifuging the combined cleaned particles to remove residual solvent and recovering the combined solids having reduced contamination for disposal. |
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DETAILED DESCRIPTION The present invention relates to a method comprising a unique sequence of steps for continuously removing or cleaning solvent soluble contamination from particulate solids and a corresponding apparatus.
The invention has particular application to cleaning organic contamination from particulate solids such as in cleaning oil from drill cutting solids and employs solvents to dissolve and carry away contamination from the surfaces and pores of the solids.
While the present invention is described with reference to drill cutting solids, it is to be understood that the invention has wide application in cleaning contaminants from solids, e.
g.
cleaning various organic and inorganic contaminants from earthen materials using suitable solvents including water as well as other solvents more particularly described hereinafter.
Drill cutting solids, as this term is used herein, includes all solids that may be separated from the drilling mud returned from a wellbore during drilling operations.
Although the majority of these solids comprise the actual borehole material cut from the formation, other solids materials will also usually be present including additives which are conventionally used in formulating drilling muds such as weighting agents (e.
g.
barite, hematite, etc.
), fluid loss materials (e.
g.
miscellaneous fibrous materials, etc.
) and other well known additives.
These additives may be present in finely ground form, as is usual with weighting agents, or in larger regular or irregular forms, as may be the case with fluid loss additives.
The actual borehole material contained in the solids will generally comprise a wide spectrum of sizes ranging from extremely fine particles to relatively coarse particles and the relative proportions will vary extensively with the types of formations being drilled.
In accordance with the invention, oil-contaminated drill cutting solids, after separation from the drilling mud, are mixed with suitable solvent to form a slurry.
In the slurrying step, a significant portion of the oil-contamination becomes dissolved in the solvent
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MEMS 
