Utilizing A Dual Use Local Materials Instead of Imported Foreign Materials for Drilling Mud Conditioning
Authors: Al-hashimi Wissam H. Al-hashimi 
Published: May 2021

The most important constituents of drilling operation success is keeping the drillingfluid rheological properties within a certain limit to maintain continuity of theirfunctions in a good manner. To achieve that, the drilling mud system needs continuousand direct supervision such as measuring its rheological properties and treating anydeviation in their values. Viscosity is the most important property in hydraulic programsuccess due to its direct relation with a bottom hole cleaning during well drilling, thusrelated with the drilling rate, so this property should be kept essentially to ensurebottom hole cleaning and high drilling rate at the same time.Some chemicals should be added to the mud system to keep both viscosity and otherproperties within certain standards and the required limit ,the high cost of suchchemicals increase both the metric cost and the final cost of such wells.The aim of this research is to test the physical and chemical properties of a localmaterial, as a thinner and a filtration rate reducer, which tends to decrease therheological properties of drilling mud. Twenty six samples of different types of drillingmud are tested with both the local and imported foreign materials.The results for both additive materials are compared and it is found that the localthinner has the same trend as the foreign material to a certain extent. Also, in this work,the ideal rheological model is detected among six rheological models by preparing anexcel system program to determine the Average Absolute Percentage Error (AAPE).This program compares the calculated shear stress values and the measured valuesobtained from high pressure high temperature viscometer.The selected models are Bingham plastic model, Power law model, Modified powerlaw model, Robertson stiff model, and Modified Robertson stiff model and Cassonmodel.

The most important constituents of drilling operation success is keeping the drillingfluid rheological properties within a certain limit to maintain continuity of theirfunctions in a good manner. To achieve that, the drilling mud system needs continuousand direct supervision such as measuring its rheological properties and treating anydeviation in their values. Viscosity is the most important property in hydraulic programsuccess due to its direct relation with a bottom hole cleaning during well drilling, thusrelated with the drilling rate, so this property should be kept essentially to ensurebottom hole cleaning and high drilling rate at the same time.Some chemicals should be added to the mud system to keep both viscosity and otherproperties within certain standards and the required limit ,the high cost of suchchemicals increase both the metric cost and the final cost of such wells.The aim of this research is to test the physical and chemical properties of a localmaterial, as a thinner and a filtration rate reducer, which tends to decrease therheological properties of drilling mud. Twenty six samples of different types of drillingmud are tested with both the local and imported foreign materials.The results for both additive materials are compared and it is found that the localthinner has the same trend as the foreign material to a certain extent. Also, in this work,the ideal rheological model is detected among six rheological models by preparing anexcel system program to determine the Average Absolute Percentage Error (AAPE).This program compares the calculated shear stress values and the measured valuesobtained from high pressure high temperature viscometer.The selected models are Bingham plastic model, Power law model, Modified powerlaw model, Robertson stiff model, and Modified Robertson stiff model and Cassonmodel.