Results 21 to 30 of about 905,932 (309)
Ultrasonic-Assisted Rock-Breaking Technology and Oil and Gas Drilling Applications: A Review
Energies, 2022 High-efficiency rock-breaking is a problem that has long been studied in the oil- and gas-drilling industry. The successful use of ultrasonic technology in related fields has prompted us to study how to introduce ultrasonic technology into rock-breaking ...
Jinyu Feng, T. Yan, Yang Cao, S. Sun
semanticscholar +1 more source
Study on the influence of drilling fluid filtration on stability of coalbed wellbore
Meikuang Anquan, 2021 Coal rock has many porous characteristics, such as cleavage, pore and so on. Drilling fluid is easy to invade into coal bed rock, which is easy to cause wellbore instability.
ZHANG Yi, CHEN Dong, ZHANG Hui, LIU Mengmeng, LIU Fu, WEI Kai
doaj +1 more source
Mathematics, 2022 Accurate, rapid and effective analysis of rock drillability is very important for mining, civil and petroleum engineering. In this study, a method of rock drillability evaluation based on drilling process monitoring (DPM) parameters is proposed by using ...
Shaofeng Wang +4 more
semanticscholar +1 more source
Bionic design and test of polycrystalline diamond compact bit for hard rock drilling in coal mine
, 2020 For hard rock drilling in coal mine, the drilling efficiency and service life of polycrystalline diamond compact bit are very low. To overcome these shortcomings, the bionic technology is applied to the design and processing of polycrystalline diamond ...
Chuanli Wang
semanticscholar +1 more source
International Journal of Coal Science & Technology, 2021 The rock uniaxial compressive strength (UCS) is the basic parameter for support designs in underground engineering. In particular, the rock UCS should be obtained rapidly for underground engineering with complex geological conditions, such as soft rock ...
Hongke Gao +5 more
semanticscholar +1 more source
Improving the operational efficiency of drilling rock-breaking tools [PDF]
E3S Web of Conferences, 2023 Improving the quality and volume of drilling is the main condition for advancing the growth of reserves of raw materials of the national economy and industry. Rock-breaking tools are the main and busiest part of drilling equipment.
Juraev Rustam +2 more
doaj +1 more source
Applied SciencesIn order to solve the problem of the low end positioning accuracy of large hydraulic rock drilling robotic arms due to machining error and the working environment, this paper proposes an end positioning error compensation method based on an Improved ...
Qiaoyu Xu +3 more
semanticscholar +1 more source
British Educational Research Journal, EarlyView., 2023 Abstract Children's relationship with time in preschools is an under‐researched area. Young children rarely know how to measure time using a clock, but their experiences of time may contribute to understanding children's well‐being and debates about quality in preschools.
Kristín Dýrfjörð +3 more
wiley +1 more source
A New Method for Determining the Spatial Distribution Law of Rock Anti-Drilling Characteristics
Shiyou jixie, 2021 When the existing method for determining the distribution laws of rock anti-drilling characteristics is adopted, the rock anti-drilling characteristics at the same depth are not distributed continuously and the spatial distribution laws of rock anti ...
Hu Pengjie +5 more
doaj
An analytical model for estimating rock strength parameters from small-scale drilling data
Journal of Rock Mechanics and Geotechnical Engineering, 2019 The small-scale drilling technique can be a fast and reliable method to estimate rock strength parameters. It needs to link the operational drilling parameters and strength properties of rock.
Sajjad Kalantari +2 more
doaj +1 more source