## 4 Amount of Drilling Fluid Loss in the Drilling Realization Stage
On the subsequent days of the works, a higher pressure (3200-3300 L/min) and lower amount of additives were used. During the works, bentonite is dominant in the drilling fluid. The total treated volume also depends on the phase of the engineering works: it is much higher in the second phase of works (expanding the borehole; here, starting from the seventh day of drilling using the HDD method). Considering the small size of the groups and the absence of distribution similar to normal in specific groups, the distributions of quantitative variables in more than two groups were compared with the use of the non-parametric rank variance analysis (ANOVA) by [PERSON]. Post hoc analyses were conducted using the Dunn test, with Bonferroni correction. For all analyses, the maximum accepted Type I error (false positive) of \(\alpha\) = 0.05 was assumed, while \(p\)\(\leq\) 0.05 was considered statistically significant (Table 6). \begin{table}
\begin{tabular}{c c c c c c c c c c c c} \hline \hline
**Variable** & \(N\) & \(M\) & \(SD\) & \(Min\) & \(Max\) & \(Q_{1}\) & \(Mdn\) & \(Q_{3}\) & _Skew_ & \(K\) & \(S\)-\(W\) & \(p\) \\ \hline
**Bentonite** & 19 & 6.12 & 4.44 & 0.00 & 16.10 & 2.80 & 5.80 & 9.30 & 0.66 & \(-\)0.12 & 0.96 & 0.533 \\ \hline
**Soda Ash** & 20 & 0.03 & 0.05 & 0.00 & 0.20 & 0.00 & 0.00 & 0.05 & 2.10 & 4.49 & 0.67 & \(<\)0.001 \\ \hline
**HydroClay** & 20 & 0.11 & 0.13 & 0.00 & 0.38 & 0.00 & 0.10 & 0.20 & 0.80 & \(-\)0.53 & 0.83 & 0.002 \\ \hline
**Time of discharge from the bottom [min]** & 20 & 97.00 & 66.38 & 19.00 & 214.00 & 32.25 & 79.00 & 155.50 & 0.48 & \(-\)1.19 & 0.90 & 0.048 \\ \hline
**Circula-tion time [min]** & 20 & 281.70 & 187.11 & 85.00 & 897.00 & 147.75 & 260.50 & 365.00 & 1.93 & 5.33 & 0.82 & 0.002 \\ \hline
**Losses [\%]** & 20 & 6.60 & 8.56 & 1.90 & 36.70 & 2.00 & 2.70 & 7.65 & 2.72 & 8.08 & 0.61 & \(<\)0.001 \\ \hline \hline \end{tabular}  
* Note: \(N\)—quantity; \(M\)—average; \(SD\)—Standard deviation \(Min\)—minimum value; \(Max\)—maximum value; \(Q_{1}\)—1 st quartile; \(M\)—median; \(Q_{3}\)—3 rd quartile; \(Skew\)—skew; \(K\)—kurtosis; \(S\)-\(W\)—Shapiro-Wilk test result; \(p\)—significance level for the \(S\)-\(W\) test.  
\end{table} 
Table 6: Characteristics of the level of the analyzed variables in the tested sample (\(N\) = 20). \begin{table}
\begin{tabular}{c c c c c c c c c} \hline \hline
**Fraction Separation Set** & \multicolumn{3}{c}{**Solid Fraction**} & \multicolumn{3}{c}{**Product**} \\ \hline
**Daily Treated** & **Total Treated** & **Water: Borehole** & **Drillings borehole** & **Bentonite** & **Soda Ash** & **ClayCutter** & **Detergent** & **HydroClay** \\ \hline
141 & 141 & 6.6 & 0.91 & 11.60 & 0.13 & 0.09 & 0.13 & 0.13 \\ \hline
83 & 224 & 6.5 & 0.79 & 13.20 & 0.00 & 0.18 & 0.17 & 0.33 \\ \hline
83 & 224 & 6.8 & 0.70 & 0.00 & 0.00 & 0.00 & 0.00 & 0.22 \\ \hline
713 & 937 & 3.3 & 1.00 & 3.70 & 0.03 & 0.00 & 0.00 &The descriptive statistics and the result of the distribution normality test, together with the degree of concentration and skewness of the quantitative variables analyzed in the project, are presented below. In order to determine whether individual fractions differed in terms of the volume of applied bentonite, as well as the soda ash and HydroClay additives, an analysis was conducted using the Kruskal-Wallis test. The results are presented in Figures 4-6.  
statistically significant differences between groups with respect to the analyzed variable: \(H\) (3, \(N=20\)) = 2.28; \(ni\) and \(H\) (3, \(N=20\)) = 4.68; \(ni\). In order to analyze whether individual fractions differed in terms of the time of outflow of the drilling fluid from the bottom, an analysis was conducted using the Kruskal-Wallis test (Table 7). The test analysis for bentonite revealed statistically significant differences between groups with respect to the analyzed variable: \(H\) (3, \(N=20\)) = 8.06; \(p\) < 0.050, although multiple post hoc comparisons did not reveal statistically significant differences (\(p\) > 0.050).