Jun 07

In early days of solids control in oil drilling, shale shakers and dilution were the only solutions for it.  Yet when time move forward and demand of finer solids separation is need it, hydrocyclones and decanter centrifuges became available for drilling application.  When need to remove finer solids after shale shakers, the dilution process will be implied. While drilling with mud that is weighted, when the solids contents reach beyond acceptable level, the not likely but necessary choice to keep control viscosity is adding not stopping water while adding barite to control the weight of mud.  It was obviously a costly step due to create large quantities of excess of drilling mud.

160624ShaleShaker

The decanter centrifuge is divide processed mud into two. The underflow contains rough solids and overflows which contain most in liquid with finer debris. It provides meaning of selectivity the finest and most disturbs debris from drilling mud.  The purpose to removal these debris is control rheology and filter rough debris for centrifuging weighted drilling fluids.  When finer debris is not removed, the only means of reducing the concentration is add more water and it is increase production cost.

Centrifuge’s purpose is like hydrocyclones and shale shakers, it is solids-removal machinery.  It weighted drilling mud while drilling is correctly thought of as an alternative to dilution for the reduction of viscosity.  The objective of centrifuging in this manner is the removal of colloids and ultra-fine solids by high spinning g-force separate from contaminated drilling mud to improve drilling mud purifications quality. A natural consequence of this belief is that the underflow from barite-recovery centrifuges is sometimes stored and used to weight up freshly prepared drilling mud. Inasmuch as the recovered slurry often contains high concentrations of drilled solids, it can be heavily contaminated, and is rarely can reuse.

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written by GN Shale Shaker \\ tags: , , ,


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