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The tolerance limit for drilling solid is 15%% (wt/vol).
BBDF can tolerate 10%% sea water, or 15%% drilling solid.
If more drilling solid exists in the system, the PV would become too high (>50 mPa·s).
Table 7 indicates the situations of BBDF with different amounts of shale powder (drilling solid).
The tolerance limits for sea water and drilling solid are 10%% (vol/vol) and 15%% (wt/vol), respectively.
Different amounts of sea water and shale powder (as drilling solid) were added into BBDF respectively, and the properties of the drilling fluid after hot-rolling were determined to evaluate the contaminant tolerance of BBDF.
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However, these properties are subjected to change during drilling operations due to variation in mud maintenance and the introduction of drilling solids and contaminations.
The use of bentonite to simulate the drilled solid is good agreement with previous works.
The results were discussed in terms of electric stability (emulsion stability), high-pressure high-temperature (HPHT) including the resultant filter cake, rheological properties of the active fluid Experiments show that the ES drops in half as the drilled solid (bentonite) concentration increases from 0 to 75 lb/bbl.
The gel strength is one of the important drilling fluid properties because it demonstrates the ability of the drilling mud to suspend drill solid and weighting material when circulation is ceased (in case of drilling stop).
Fallacious arguments persist that drilled solids are beneficial.
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