Results 61 to 70 of about 177 (131)
Effective Geothermal Utilisation close to the surface by the TT-Geothermal Radial Drilling (GRD-)Method [PDF]
Acta Montanistica Slovaca, 2007 In the late 1970-Years, Tracto-Technik developped a very effective radial-shaped percussion system for a geothermal heating, the ECOtherm-System, which was very well accepted by customers.
Hans-Joachim Bayer
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Flow structure and rock-breaking feature of the self-rotating nozzle for radial jet drilling
Petroleum Science, 2019 For improving the hole-enlarging capability, roundness and rock-breaking efficiency of the nozzle in radial jet drilling, a new structure of self-rotating nozzle was put forward.
Hua-Lin Liao +5 more
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Key Technology for Drilling Speed Improvement of High Abrasive Formation in Aktobe
Shiyou jixie, 2018 The Zahnanor and North Tluwa oil field in the Aktobe area are rich in oil and gas resources. The main oil and gas reservoirs are located in the Carboniferous strata below the Permian.
Wang Gang +6 more
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Energy Transmission in Percussive Drilling [PDF]
Fall Meeting of the Society of Petroleum Engineers of AIME, 1959 Abstract A simple analysis of the mechanics of stress and energy transmission in percussive drilling is presented. Four basic components of the system are recognized:the hammer,the drill rod,the bit, andthe rock and the effect of each in determining the ultimate energy transmitted into the rock is considered.
openaire +1 more source
Computer simulation of percussive drilling.
Shigen-to-Sozai, 1991 A drilling model which consists of drill-body, piston, rod and bit is presented. The model is based on onedimensional stress-wave theory for piston, rod and bit. A force/penetration relationship with hysteresis is assumed for bit/rock interaction. A computer program based on the model is also developed which allows continuous simulation of drilling ...
OKUBO, Seisuke, NISHIMATSU, Yuichi
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An Experimental Investigation of the Effects of Fiber Laser Percussion Drilling: Influence of Process Parameters [PDF]
International Journal of Advanced Design and Manufacturing Technology, 2016 This study is focused on investigating the parameters of laser percussion drilling process of nickel-base super alloy Inconel 718 with thickness of 1 mm. Fiber laser with the power of 500 watts was used as the laser source.
Mahmoud Moradi +2 more
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Partially Coherent Flat-Topped Beam Generated by an Axicon
Applied Sciences, 2019 The intensity distribution of a partially coherent beam with a nonconventional correlation function, named the multi-Gaussian Schell-model (MGSM) beam, focused by an axicon was investigated in detail.
Minghui Zhang +4 more
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Applied SciencesDown-the-hole (DTH) hammer drilling has high rock-breaking efficiency and a decisive advantage in hard rock drilling, which can reduce the cost of geothermal drilling.
Hongyu Ye +5 more
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Shiyou jixieAt the time of rotary percussion drilling and grinding of cement plug at high speed,the combination of high-speed rotary cutting and high-frequency axial percussion can significantly improve the efficiency of drilling and grinding cement plug,but the ...
Liu Wang +6 more
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Development and Application of Downhole Drilling Tool with Pulsed Asymmetrical Flow Field
Shiyou jixie, 2016 Low utilization ratio of downhole hydraulic energy in conventional drilling operation results in reduction of hydraulic auxiliary rock breaking and removal capability so that downhole cuttings cannot be timely removed to cause repeated breaking and even ...
Shao Dongdong +4 more
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