## 3 Results
### Influence of Pipe Buckling on the Destruction of Mud Plugs and Well Cleaning  
The results of the experimental study confirm the influence of the spatial shape of the pipe, namely the sinusoidal bend, on the destruction of mud plugs and cleaning the well from cuttings.  
From Figure 5a it can be seen that, when conducting experiments using Newtonian liquid as a cleaning agent, depending on the flow rate \(Q=1.25\div 1.67\times 10^{-3}\) m\({}^{3}\)/s and pipe speed \(n=2.50\) s\({}^{-1}\), there is a relative increase in the carrying capacity of the mud.  
So, when drilling a well with a zenith angle \(\alpha=35^{\circ}\), the presence of the first half-wave pipe leads to an improvement in cutting removal by 12-50%, relative to the rotation of a straight pipe without half-waves. In the presence of the three half-waves pipe, the mud is better carried out by 3.5 times, relative to the rotation of the pipe with the first half-wave, and by six times relative to the rotation of the straight pipe, with a speed \(n=2.50\) s\({}^{-1}\).  
In the study of hydromechanical destruction of mud plugs in the zone of critical zenith angles, with \(\alpha=55^{\circ}\), the presence of the first half-wave of the string leads to an improvement in mud removal by 9-54%, relative to the rotation of the pipe without half-waves. It is especially noteworthy that in the presence of the three half-waves pipe, the mud is cleared out 4.5 times better, relative to the rotation of the pipe with the first half-wave, and more than 6.5 times better, relative to the rotation of a straight pipe without half-waves, at a frequency of rotation of the pipe \(n=2.50\) s\({}^{-1}\).  
After passing through the critical zone, during the rotation of the pipe in the well with a zenith angle \(\alpha=70^{\circ}\), the presence of the first half-wave of the pipe leads to an improvement in cuttings removal by 13-49%, relative to the rotation of a straight pipe without half-waves. When rotating with a frequency of \(n=2.50\) s\({}^{-1}\) and the presence of the three half-waves pipe, the mud is carried out 4.5 times better, relative to the rotation of thestring with the first half-wave, and more than 7 times better, relative to the rotation of a straight string without half wave.  
From Figure 5b it can be seen that, when a pseudo-plastic liquid is used as a mud, depending on the flow rate \(Q=0.83\div 1.25\times 10^{-3}\) m\({}^{3}\)/s, the sinusoidal bending of the pipe increases the carrying capacity of the cuttings.  
When drilling a well with a zenith angle \(\alpha=35^{\circ}\), the presence of the first half-wave of string leads to an improvement in cuttings removal by 4-8%, relative to the rotation of a straight string without half-waves. In the presence of the three half-waves string, the mud is better carried out by 6-26%, relative to the rotation of the pipe with the first half-wave, and by 10-33% relative to the rotation of the straight pipe without half-waves.  
In the study of hydromechanical destruction of mud plugs in the zone of critical zenith angles, with \(\alpha=55^{\circ}\), the presence of the first half-wave string leads to an improvement in the removal of mud by 3-15%, relative to the rotation of a straight string without half-waves. It is noteworthy that in the presence of three half-waves pipes, the mud is better carried out by 7-28%, relative to the rotation of the pipe with the first half-wave, and by 10-36% relative to the rotation of a straight pipe without half-waves.  
It has been established that, during the rotation of pipe in a well with a zenith angle \(\alpha=70^{\circ}\), the presence of the first half-wave string leads to an improvement in cuttings removal by 2-7%, relative to the rotation of a straight string without half-waves. In the presence of three half-waves strings, the mud is carried out better by 4-28%, relative to the rotation of the pipe with the first half-wave, and by 8-37% relative to the rotation of a straight pipe without half-waves.