## 5 Conclusions  
The waterjet method of creating radial channels presents a promising technology for enhanced oil recovery. The existing equipment arrangements for radial drilling are characterized by low metal requirement, while the technological operations are time- and relatively cost-saving.  
As a result of the conducted experiments, it was found that the dynamic mode of stimulation is more effective in comparison with the static mode. Thus, the development and introduction of additional modules to the equipment arrangement to provide constant forced linear-reciprocating motion of the waterjet nozzle will significantly increase the efficiency and speed of waterjet drilling.  
As a result of the conducted bench tests, the optimal operating parameters were determined to achieve an effective process of waterjet channel creation under experimental conditions:  
* The optimum ratio of the number of front-to-rear diffusers (assuming they have the same diameter) is 1/3.
* The permissible number of front diffusers is at least three.
* The value of the specific flow rate of the working agent per unit of total area of the front and rear diffusers shall tend to 26.75 L/(min-mm\({}^{2}\)).
* The proposed calculation coefficients should be within: K\({}_{\text{nom}}\geq\) 1.86, K\({}_{\text{actual}}\geq\) 0.93.  
In addition, on the basis of the obtained results, an assumption is made about the method of increasing the useful area of the created radial channel by using rotary-type waterjet nozzles (with rear diffusers rotating around the central axis). The questions of selecting the most effective modes of dynamic stimulation of rocks with different mechanical properties and studying the effectiveness of using rotary-type waterjet nozzles require additional research and bench tests, but the obtained results will allow to develop a methodology for selection of equipment arrangement and technological parameters of radial drilling for rocks with different mechanical properties.  
As a result of the conducted research, the group of authors set the following task: to design and manufacture an underground equipment arrangement to ensure dynamic  
\begin{table}
\begin{tabular}{c c c c c c} \hline \hline
**Mode No.** & **Din, mm** & \
\begin{tabular}{c} **Working Agent** \\ **Flow Rate, L/min** \\ \end{tabular} &
\begin{tabular}{c} **Average Time of 10-m** \\ **Section Passage, s** \\ \end{tabular} & \(K_{nom}\) & \(K_{actual}\) \\ \hline
1 & 48 & 21 & 7.52 & 1.23 & 0.62 \\ \hline
2 & 48 & 10.5 & 9.55 & 1.23 & 0.62 \\ \hline
3 & 38 & 21 & 6.59 & 1.86 & 0.93 \\ \hline
4 & 38 & 10.5 & 8.36 & 1.86 & 0.93 \\ \hline
5 & 62 & 21 & 10.84 & 0.84 & 0.42 \\ \hline
6 & 62 & 10.5 & 24.34 & 0.84 & 0.42 \\ \hline
7 & 106 & 21 & 70.11 & 0.42 & 0.21 \\ \hline \hline \end{tabular}
\end{table}
Table 4: Results of calculations of the proposed coefficients and their correlation with the obtained results of waterjet nozzle velocity studies.  
stimulation (constant forced linear reciprocating motion of the waterjet nozzle) taking into account the specified values of operating parameters.  
Conceptualization, S.K. and A.K.; methodology, A.K.; software, A.Y.; validation, A.K. and E.O.; formal analysis, S.K.; investigation, A.Y.; resources, A.K.; data curation, E.O.; writing--original draft preparation, S.K.; writing--review and editing, E.O.; visualization, A.Y.; supervision, A.K.; project administration, S.K.; funding acquisition, S.K. All authors have read and agreed to the published version of the manuscript.  
The research was funded by the Ministry of Science and Higher Education of the Russian Federation (Project No. FSNM-2023-0005).  
Not applicable.  
The original contributions presented in the study are included in the article, further inquiries can be directed to the corresponding author.  
The authors declare no conflict of interest.