Variable Solids Control Equipment With Different Results

Aug. 25, 2012 - PRLog -- Variables involved in shale shaker design include screen cloth characteristics, type of motion, position of screen, and arrangement of multiple screens. The Development Document for the coastal oil and gas rulemaking provides a general discussion of how these variables are reflected in shale shaker design.The application of these variables distinguishes the three types of shale shakers used with SBF/OBF drilling fluid systems. In general, the factor that distinguishes primary and secondary solidsseparation equipment design is the size of the solids removed by each unit. The primary shale shaker has screens with the lowest mesh (i.e., the least number of openings per linear inch, giving the largest screen hole size) to separate the largest cuttings. Secondary and drying shale shakers have finer mesh screens to remove smaller cuttings and fine particles.

In addition to mesh size, screen shape and orientation vary according to the level of separation required. Both the shape and orientation of the screen affect the retention time, or the time the process stream is exposed to the separation unit. A longer retention time on a shale shaker allows for potentially greater separation of solids from drilling fluid, but also increases the mechanical degradation of the solids.

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