The influence of sequential drilling and machining parameters on uncut fiber formation and delamination damage in fiber-reinforced composites [PDF]
Scientific ReportsDrilling is crucial in composite manufacturing, but often induces delamination and uncut fibers, degrading structural integrity. This study examines the combined influence of sequential drilling (using drills of progressively increasing diameter) and ...
Sayed Mohammad Hossein Izadi +1 more
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A method for predicting the build-up rate of single-bending positive displacement motor assembly in compound drilling [PDF]
E3S Web of Conferences, 2022 Accurately predicting the build-up rate of single-bending positive displacement motor (PDM) assembly in compound drilling is helpful to rational design the well trajectory, realize compound drilling in long well sections and improve the rate of ...
Hu Guangqiang +4 more
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Drill rig with a down-the-hole hammer for regulating the drilling rate by changing the air flow [PDF]
E3S Web of Conferences, 2021 At present, a lack of efficiency of the rotary drilling intensification can be observed at mining enterprises that employ drill rigs. Due to this, we propose to enhance the rotary drilling using shock loads by installing a down-the-hole (DTH) hammer into
Yungmeister D, Gasimov E
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Applied Sciences, 2022 It is generally believed that core discing is a rock failure phenomenon under high in-situ stress, and high stress is closely related to the characteristics of core discing. The core drilling tests of intact granite were conducted on the laboratory servo-
Hua Tang +4 more
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Machines, 2021 In this paper, to identify the roof unconfined compressive strength (UCS) in the process of coal mine roadway support in real-time and optimize the real-time drilling speed while drilling, this paper proposes and establishes a drilling test method for ...
Guangdong Yu +4 more
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In-situ tests on quantitative evaluation of rock mass integrity based on drilling process index
Yantu gongcheng xuebao, 2021 The real-time response characteristics of drilling tools contain important engineering geological information. By interpreting the drilling data, the rock mass integrity can be quantitatively evaluated, which provides a new way to quickly obtain the ...
CAO Rui-lang 1, WANG Yu-jie 1, ZHAO Yu-fei 1, WANG Xiao-gang 1, HE Sun-wen 2, PENG Lin-jun 3
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Challenges of rock drilling and opportunities from bio-boring
Biogeotechnics, 2023 Drilling plays a significant role in the history of human civilization. The exploration of greater depths, extreme environments, or hazardous areas calls for more energy-efficient and high levels of autonomous drilling technologies with reduced cost and ...
Yumeng Zhao, Sheng Dai
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Jin'gangshi yu moliao moju gongcheng, 2023 The processing damages such as delamination and tearing were easily produced during the drilling of the sleeve holes of GFRP, which were directly related to the axial drilling force. In order to improve the quality of GFRP hole-making, a new diamond thin-
Xianglong DONG +6 more
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Application of an Adaptive Neuro-fuzzy Inference System and Mathematical Rate of Penetration Models to Predicting Drilling Rate [PDF]
Iranian Journal of Oil & Gas Science and Technology, 2018 The rate of penetration (ROP) is one of the vital parameters which directly affects the drilling time and costs. There are various parameters that influence the drilling rate; they include weight on bit, rotational speed, mud weight, bit type, formation ...
Hossein Yavari +3 more
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Theoretical analysis and design of hydro-hammer with a jet actuator: An engineering application to improve the penetration rate of directional well drilling in hard rock formations. [PDF]
PLoS ONE, 2018 Rapid horizontal directional well drilling in hard or fractured formations requires efficient drilling technology. The penetration rate of conventional hard rock drilling technology in horizontal directional well excavations is relatively low, resulting ...
Jiang-Fu He +3 more
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