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The Modal Analysis of Pneumatic DTH Short Drillstring

Author: YeJuan
Tutor: BoChangGen
School: Chinese Geology University (Beijing)
Course: Geological Engineering
Keywords: Short drillstring Pneumatic DTH Finite Element Modal Boundary conditions
CLC: P634.3
Type: Master's thesis
Year: 2006
Downloads: 200
Quote: 0
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Abstract


DTH hammer drilling technology with its high drilling efficiency , low power consumption , security , etc. are widely used in water well drilling , mining and other fields . DTH hammer drilling deep holes generally less than 200m, so the DTH for short drillstring system natural frequency of vibration is high impact frequency of DTH hammer , the shock spectrum thump drill frequency range width and other characteristics easily caused DTH hammer short lead drillstring with system modal vibration , which will cause the drill pipe fatigue , accelerated drilling system wear , increased down-the-hole hammer drilling perforation costs . So it is necessary to short drillstring dynamics analysis , different specifications of short drillstring simulation response at the natural frequency as close as possible to the actual drilling case , the impact of the drill string coupling system from DTH for short the analysis identified the natural frequency of the drillstring system excitation . This paper first introduces the DTH for the characteristics and working principle , summarized the domestic and international the drillstring dynamics of the status quo . Then DTH for short drillstring force status . Start with the finite element method , finite element analysis software ANSYS to establish a three-dimensional finite element model of the short drillstring , and is set according to the actual situation of the short drill string in the construction of a variety of boundary conditions , different parameters of short drillstring modal analysis to obtain a large amount of data under a variety of boundary conditions . Modal analysis results are then compared and analyzed to identify the different parameters and boundary conditions , shorter variation of the natural frequency of the drillstring , and analysis of the impact of different factors on the natural frequency of the short drillstring . The above calculation and analysis of the results , the DTH for short drill column system to optimize the design and drilling technology with practical application value .

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CLC: > Astronomy,Earth Sciences > Geology > Geology, mineral prospecting and exploration > Drilling Project > Drilling machinery and instrumentation
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