Nazarov O.Ye., Gankevych V.F., Pashchenko O.A., Kiba V.Ya. Reduction of power-intensivity at rotary-percussive drilling

Details
Parent Category: Geo-Technical Mechanics, 2020
Category: Geo-Technical Mechanics, 2020, № 150

Geoteh. meh. 2020, 150, 146-155

https://doi.org/10.15407/geotm2020.150.146

 

REDUCTION OF POWER-INTENSIVITY AT ROTARY-PERCUSSIVE DRILLING

1Nazarov O.Ye., 2Gankevych V.F., 2Pashchenko O.A., 2Kiba V.Ya.

1Institute of Geotechnical Mechanics named by N. Poliakov of National Academy of Sciences of Ukraine, 2National Technical Univercity “Dnipro Politechnic”

UDC 622.24.085

Language: Russian

Annotation.

In the article, mechanisms for rotary-percussive drilling of hard rocks and submersible hydraulic hammers in particular are considered. The existing designs of hydraulic hammers are reviewed, and their disadvantages are specified. The requirements for hydraulic hammers and advantages of the submersible hydraulic hammers are considered. A new method for improving the performance of hydraulic hammers is proposed, which increases efficiency of hydraulic hammers up to 90-95%. A new design of a double-action submersible hammer is presented, which implements a new method of its operation. It is stated that advantage of this design of the hammer is that the shock is taken by maximum possible area of the accelerator part, which occupies the entire cross section of the hammer, and which is perpendicular to the oncoming water flow. This design allows using maximum of the hydroshoke energy for the primary acceleration of the striker. Also, the designed hydraulic hammer makes it possible to further accelerate the striker to the required speed by using the water pressure and its flow rate created by the pump unit by way of displacing the valve liner out from the high-pressure chamber by the created liquid pressure. A detailed description of the new design of the double-action submersible hydraulic hammer is shown in the figures of working positions of its parts. Processes of fluid motion and movement of the details of the submersible hydraulic hammer for one full cycle of its operation are described. General methodology for the mathematical calculation of geometric parameters of the newly-designed double-action submersible hydraulic hammer is presented, in particular, stroke size of the striker, accelerator and accelerator valve. The advantages of the designed submersible hydraulic hammer and area of its most effective application are described. Thus, the double-action submersible hydraulic hammer makes it possible to comprehensively use energy of the fluid flow for removing destruction products as well. The design of the submersible hydraulic hammers increases drilling efficiency by 2-2.5 times in comparison with remote hydraulic hammers and by 1.5-2 times in comparison with existing submersible hydraulic hammers. This design is equally operable when drilling vertical, horizontal and other boreholes with arbitrary angle of inclination through the rocks of any hardness and is recommended for drilling boreholes with small and medium diameter.

Key words:

hammer, destruction, drilling, borehole, power intensity, rotary-percussive drillung.

References

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About the authors

Nazarov Oleksandr Yevhenovych, Doctoral Student in the Department of Pressure Dinamic Control in Rocks, Institute of Geotechnical Mechanics named by M. Poliakov NAS of Ukraine, Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it. .

Gankevych Valentyn Feodosiiovych, Candidate of Technical Science (Ph.D.), Senior Researcher, Associate Professor of the Department of Engineering and Design in Mechanical Engineering, National Technical University “Dnipro Polytechnic” (NTU «DP»), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

Pashchenko Oleksandr Anatoliiovych, Dnipro Polytechnic National Technical University, Director of the Interdisciplinary Educational and Scientific Institute of Continuing Full-time and Distance Education, Candidate of Technical Science (Ph.D.), Associate Professor of the Department of Oil and Gas Engineering and Drilling, National Technical University “Dnipro Polytechnic” (NTU «DP»), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

Kiba Viacheslav Yakovych, Master of Science, Senior Lecturer of the Department of structural and theoretical mechanics, National Technical University “Dnipro Polytechnic” (NTU «DP»), Dnipro, Ukraine