The drilling fluid filtration index depend on a number of factors such as process water composition, chemical reagents and materials, composition and concentration of the drilled and artificially introduced solid phase. Drilling fluid filtration index is also affected by technological and geological conditions, such as the mud cleaning system, composition and properties of the rocks and formation waters. This article presents the results of a laboratory study of the filtration rate dependence on the concentration of the solid phase presented in a model mineralized water-based biopolymer drilling fluid used in the fields of Eastern Siberia for drilling in the interval of salt and subsalt, including productive deposits. The study was carried out stepwise using drilling fluid samples, various models of the solid phase, both with and without the introduction of a calcium carbonate bridging agent. The model composition of the finely dispersed solid phase was a combination of geological section of rocks and based on previously performed studies. In the work, standard methods and common laboratory instruments to control the parameters were used. The research results showed that the increase in the concentration of drilled solids has a negative impact on the filtration index of the drilling fluid, and the introduction of calcium carbonate leads to a decrease in both the absolute values of the filtration index and its growth rate. Mathematical models that describe the dependence of the filtration index on the concentration of the solid phase in both the drilling fluid with and without a bridging agent are proposed. The optimal composition of the solid phase under considered conditions was revealed.
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