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Drilled solid is a continuous contaminant in drilling mud during drilling operation. The purpose of this study is to evaluate the statistical correlation of drilled solid concentration on mud rheology. A Spearman's correlation was used to determine the relationship between 31 mud rheology data and the drilled solid concentration data from North Kuwait Field. Four rheological models were used to compare the rheological behaviour of the drilled solid-laden drilling fluid which were Bingham Plastic, Power Law, Herschel-Bulkley and Robertson-Stiff Model. Results showed that a positive monotonic relationship was observed between all drilled solid concentration and mud rheology parameters. An excessive relationship was observed between drilled solid concentration and mud density with a Spearman coefficient (ρ) of 0.942. Other mud rheology parameters such as plastic viscosity, yield point and gel strength show a significant (high) relationship with a spearman coefficient (ρ) in between 0.833 and 0.704. Flow curves of the drilled solid-laden drilling fluids used in this study can be well depicted by the Herschel-Bulkley and Robertson-Stiff Model. These results are not only support the justifiable attention given to address drilled solid impact to the mud rheology, but they also proposed a statistically approach in preparing data for analysis.

The effect of blending polycarbonate (PC) into polypropylene (PP) matrix polymer on thermal conductivity and crystal structure was studied. The blends consisted of 5% to 35% of PC with 5% compatibilizer (polypropylene-graft-maleic anhydride or PP-g-MA), were compounded using twin-screw extruder and shaped into standard tests samples by compression molding. The thermal conductivity values for PP/PC/PP-g-MA blends were ranging from 0.22 – 0.24 W/m.K. When compared to Hanshin – Shtrikman model, the highest difference in the thermal conductivity values was 28.2% shown in 90/5/5 composition. The deviation was due to the exclusion of factors such as PC particulates’ geometry, size, and dispersion in PP matrix. X-ray Diffraction (XRD) test revealed the blends’ structures comprised of medium-range order domains, referring to imperfect crystals with nanoparticles. The locations of peaks in the XRD spectrum also suggest that the pure PP’s monoclinic alpha crystal appeared in all PP/PC/PP-g-MA blends and there was no other crystal obtained in the blends. From the result, the discovered traits of crystal structure displayed influence on the thermal conductivity of the blends. At the same time, reactive compatibilization was suspected to take place at the interface of PP and PC phases when PP-g-MA was introduced.

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