Download e-book for kindle: Drilling Fluids Processing Handbook by ASME Shale Shaker Committee
By ASME Shale Shaker Committee
The one source on hand to the drilling and petroleum engineer on drilling fluids processing.
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Extra info for Drilling Fluids Processing Handbook
Thus, as mud density is increased, MBT must be reduced so that PV does not reach such a high level that it exceeds pump capacity or causes well-bore stability problems. 4, increasing the mud density from 10 lb/gal to 18 lb/gal requires that the MBT be reduced by half [M-I llc]. Diﬀerent mud densities require diﬀerent strategies to maintain the concentration of drilled solids within an acceptable range. , use of a shale inhibitor or deﬂocculant like lignosulfonate), (b) more frequent dilution of the drilling ﬂuid with base ﬂuid, and (c) more complex solidsremoval equipment, such as mud cleaners and centrifuges [Svarovsky].
Above a concentration of a few weight percent, dispersed drilled solids can generate excessive low-shear-rate and high-shear-rate viscosities, greatly reduced drilling rates, and excessively thick ﬁlter cakes. 4, with increasing mud density (increasing concentration of weighting material), the high-shear-rate viscosity (reﬂected by the plastic viscosity [PV]) rises continuously even as the concentration of drilled solids (low-gravity solids [LGSs]) is reduced. The methylene blue test (MBT) is a measure of the surface activity of the solids in the drilling ﬂuid and serves as a relative measure of the amount of active clays in the system.
The smaller cuttings, or drilled solids, left in the drilling ﬂuid were discovered to be detrimental to the drilling process. Another ore dressing machine was introduced from the mining industry: the cone classiﬁer. This machine, combined with the concept of a centrifugal separator, taken from the dairy industry, became the hydrocyclone desander, introduced to the industry around 1957. The basic principle of the separation of heavier (and coarser) materials from the drilling ﬂuid lies in the centrifugal action of rotating the volume of solids-laden drilling ﬂuid to the outer limit or periphery of the cone.
Drilling Fluids Processing Handbook by ASME Shale Shaker Committee