RESULTS OF EXPERIMENTAL STUDIES OF THE HYDRAULIC PULSE MECHANISM FOR DRILLING PILOT WELLS DURING PIPELINE LAYING

Abstract

The relevance. Hydraulic percussive mechanisms are widely used in mining and other industries. They are currently being actively improved. In particular, numerous publications argue that it is possible to control the amplitude and duration of pressure pulses generated by hydromechanical systems in closed-loop system, through which the plunger transmit the impact energy to the rock-breaking tool. At the same time, increased duration of the power pulses lead to significant increase in the efficiency of rock failure, the excessive dynamic loads on the elements of the drilling tool are reduced. Typically percussion mechanisms have hammer the reciprocating motion of which leads to energy losses. A fundamentally new hammerless hydraulic mechanism was developed. It allows automatic regulating the amplitude and duration of the force pulses it generates, depending on the hardness of the destroyed rock. Nevertheless, it is necessary to conduct special studies in order to substantiate interrelations among its main parameters and operability in general. The main aim of the research is substantiation and experimental verification of the physical model of new hydraulic percussive mechanism in laboratory settings. Object of study is new hydraulic percussive mechanism with a closed chamber, where force pulses are formed, making the rock destruction more efficient. Subject: regularities and relationships of the main kinematic and dynamic parameters of the physical model of the hydraulic percussive mechanism. Methods: analysis of scientific and technical information regarding field of knowledge; modeling the dynamic processes in hydraulic percussive mechanism and laboratory investigation. Results. The efficiency of the hammerless hydraulic mechanisms is assessed; its advantages are revealed in comparison with the existing hydraulic percussion mechanisms; it has been established that the hammerless hydraulic mechanisms automatically regulate the amplitude and duration of power pulses depending on the hardness of the destroyed rock and do not require an additional control system for this process; the efficiency of the hydraulic percussive mechanism is higher than in existing hydro percussive systems as it forms power pulses that practically have no high-frequency components, not conducive to the rocks destruction.

Keywords

• power pulse
• high pressure hose
• hammerless hydraulic mechanisms
• closed-loop system
• pressure pulse
• pulse amplitude and duration
• trenchless pipeline construction