Results 11 to 20 of about 19,345 (302)
Drilling rate changes when air drilling is switched to mist drilling. [Claystone] [PDF]
, 1977 Eight shallow (30-foot-deep) holes were drilled in four formations to determine if the reduction in penetration rate that usually occurs when air drilling is changed to mist drilling might be due to the physical action of drilling a wet, soapy rock. The results showed an average loss of 9.3%, with the greatest loss occurring in limestone.
Williams, C. R.
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Steerable percussion air drilling system [PDF]
, 1993 The cost-sharing contract between the US Department of Energy and Smith International provides the funding to further develop this concept into two complete steerable percussion air drilling system prototypes, each integrated with a navigation tool (wireline steering tool), a bend sub, stabilizing devices, and to conduct laboratory and field testing ...
Bui, H. D., Oliver, M. S., Gray, M. A.
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Axial-torsional nonlinear vibration of bottom hole assembly in the air drilling technology
PetroleumThe safety and efficiency of drilling engineering are greatly impeded by destructive vibrations of drill string in air drilling, such as stick-slip, bit-bounce and their coupled vibrations. To avoid or suppress these vibrations improving the stability of
Shujie Ding +7 more
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Foam flushing fluid system for air screw foam drilling in soft coal seam experimental study [PDF]
Meitan kexue jishuThe structural strength of soft coal seams is low, and during drilling, problems such as hole wall collapse and stuck or buried drill bits are prone to occur, which greatly affects the mining efficiency.
Xin JIN
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Investigation of delamination mechanisms during a laser drilling on a cobalt-base superalloy [PDF]
, 2013 Temperatures in the high pressure chamber of aircraft engines are continuously increasing to improve the engine efficiency. As a result, constitutive materials such as cobalt and nickel-base superalloys need to be thermally protected.
SCHNEIDER, Matthieu +8 more
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Gong-kuang zidonghua, 2020 In view of problems of rotary drilling technology for soft-fragmentized coal seam, such as shallow borehole completed depth, uncontrollable borehole trajectory, low drilling efficiency and poor gas drainage effect, pneumatic directional drilling ...
KONG Qingjun, CHU Zhiwei
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Tool wear processes in low frequency vibration assisted drilling of CFRP/Ti6Al4V stacks with forced air-cooling [PDF]
, 2019 Drilling CFRP/Ti6Al4V stacks in one-shot time becomes essential in the modern aerospace manufacturing sectors in order to guarantee the productivity due to the demands of riveting and fastening assembly. In the present study, a novel integrated system of
EL MANSORI, Mohamed +5 more
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ROP enhancement technique for slimhole drilling in shale oil development [PDF]
Youqicang pingjia yu kaifa, 2023 The shale oil development in Sinopec Jiangsu Oilfield is facing the problems of high investment and low production. After 45 years of development, there are a lot of abandoned old wells.
XIE Xin,DOU Zhengdao,YANG Xiaomin,JIN Jing,WANG Yuanyuan,REN Fei
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Energies, 2020 The relation between rotation speed, air pressure and the velocity of air-rotary drilling using the down the hole method is determined in an empirical manner.
Tomasz Sliwa +8 more
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Applied Sciences, 2019 Polycrystalline diamond compact (PDC) cutters are the most extensively used tool for rock drilling in superdeep oil and gas exploration, in which the air drilling technology without drilling fluid is highly promoted.
Huaping Xiao, Shuhai Liu, Kaiwen Tan
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