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
doaj +1 more source
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
doaj +1 more source
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
doaj +1 more source
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
doaj +1 more source
Modeling pellet impact drilling process [PDF]
, 2016 The paper describes pellet impact drilling which could be used to increase the drilling speed and the rate of penetration when drilling hard rocks. Pellet impact drilling implies rock destruction by metal pellets with high kinetic energy in the immediate
Isaev, Evgeniy Dmitrievich +3 more
core +2 more sources
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
doaj +1 more source
Er:YAG laser, piezosurgery, and surgical drill for bone decortication during orthodontic mini-implant insertion: primary stability analysis-an animal study [PDF]
, 2017 It is important to identify factors that affect primary stability of orthodontic mini-implants because it determines the success of treatment. We assessed mini-implant primary stability (initial mechanical engagement with the bone) placed in pig jaws. We
Dominiak, Marzena +5 more
core +5 more sources
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
doaj +1 more source
Research on drilling process technology and parameter optimization in soft coal seam [PDF]
E3S Web of Conferences, 2021 Due to the low firmness coefficient of soft coal seam and the influence of formation pressure and in-situ stress, it is easy to cause hole collapse in bedding drilling, resulting in low hole forming rate and insufficient hole forming depth, so the ...
Wu Weizheng
doaj +1 more source
Research on trajectory control of dual-power composite directional drilling in underground coal mine
Gong-kuang zidonghua, 2021 Drilling trajectory control is one of the key technologies to achieve safe and efficient composite directional drilling. Due to the different force conditions of drilling tools in the hole and the composition of the analysis model, the existing ...
LI Quanxin +3 more
doaj +1 more source