Results 11 to 20 of about 1,204 (263)

Sealing method and experimental study of large-diameter reverse circulation hole hammer [PDF]

E3S Web of Conferences
A reliable sealing structure is the key to achieving reverse circulation drilling technology for large- diameter reverse circulation down the hole hammers, and it is also a difficult point in the design of large- diameter reverse circulation down the ...
Liu Qi
doaj   +2 more sources

Numerical Simulation Study of a Swirling Drill Bit Used for Ice Core Drilling

Journal of Marine Science and Engineering, 2022
Due to its high mechanical penetration rate and lack of pollution of the environment, air reverse circulation drilling is considered to be a promising method for ice drilling.
Mengke Wang, Wenbo He, Minqi Wang, Jine Cao, Pinlu Cao   +4 more
doaj   +2 more sources

Experimental research of ice cuttings transport by air while drilling of the snow-firn layer

Лëд и снег, 2023
The snow-firn layer of the glaciers of Antarctica and Greenland contains data on the composition of the atmosphere in the past, volcanic eruptions, forest fires, anthropogenic pollution, and many other unique information.
S. A. Ignatiev, D. A. Vasilev, A. V. Bolshunov, M. A. Vasileva, A. Yu. Ozhigin   +4 more
doaj   +4 more sources

Gas reverse circulation drilling technology for large-diameter DTH hammer

Meikuang Anquan, 2023
Large diameter DTH hammer is a drilling tool which has been proved by a lot of engineering practice and can improve the construction efficiency of large diameter drilling on mine surface. However, after drilling into the aquifer, the penetration rate of
ZHAO Jiangpeng
doaj   +2 more sources

Air-Lifting Reverse-Circulation Drilling in Deep Geothermal Wells and the Effect of Dual-Wall Drill Pipe Depth Down the Hole

Energies
Geothermal energy is a renewable energy source that is rich in reserves, widely distributed, stable and reliable. The development of geothermal energy needs to be carried out by drilling wells to exploit the underground thermal fluid, and air-lift ...
Hongyu Ye, Ziwei Lai, Longjun Tian, Renjie Zhang, Bin Liu, Xiuhua Zheng   +5 more
doaj   +2 more sources

Migration Characteristics of Boring Mud in Roadway Floor Anchor Wire Hole and Test in Coal Mine

Advances in Civil Engineering, 2021
Given the difficulty in drilling the anchor holes in the roadway floor of the coal mine, the characteristics of slag movement in the process of positive and negative circulation drilling are analyzed.
Hui Zhang, Weihai Han, Youlin Xu, Mengzhi Zhu, Zhanyang Liu, Zhenfeng Wang   +5 more
doaj   +2 more sources

Investigation of Cuttings Transport in a Reverse Circulation Drill Bit during Direction Drilling Using Two-Phase Flow Simulation [PDF]

ACS Omega
Effective removal of cuttings from the central channel of the drill tool is critical for directional drilling using pneumatic down-the-hole hammers, yet the flow behavior of cuttings in reverse circulation drill bits remains unclear. This study establishes a validated Computational Fluid Dynamics (CFD) model that quantifies borehole cleaning efficiency
Guoqing Cui, Pinlu Cao, Minqi Wang, Xiaoqin Wang, Dongxing Chen, Bo Qi   +5 more
doaj   +4 more sources

Experimental and Numerical Analysis of Flow Behavior for Reverse Circulation Drill Bit with Inserted Swirl Vanes

Geofluids, 2022
A swirling drill bit designed with an integrated vane swirler was developed to improve reverse circulation in down-the-hole hammer drilling. Its entrainment effect and influential factors were investigated by CFD simulation and experimental tests.
Cheng Yang, Jianliang Jiang, Bo Qi, Guoqing Cui, Liyong Zhang, Yunwang Chen, Pinlu Cao   +6 more
doaj   +2 more sources

Air reverse circulation at the hole bottom in ice-core drilling [PDF]

Journal of Glaciology, 2019
Ice-core drilling to depths of 200–300 m is an important part of research studies concerned with paleoclimate reconstruction and anthropogenic climate change. However, conventional drilling methods face difficulties due to firn permeability.
ZHENGYI HU, PAVEL TALALAY, ZHICHUAN ZHENG, PINLU CAO, GUITAO SHI, YUANSHENG LI, XIAOPENG FAN, HONGMEI MA   +7 more
doaj   +2 more sources

Simulation and Analysis of a Split Drill Bit for Pneumatic DTH Hammer Percussive Rotary Drilling

Geofluids
Reverse circulation impact drilling has the advantages of high drilling efficiency and less dust, which can effectively form holes in hard rock and gravel layer.
Yuanling Shi, Conghui Li
doaj   +2 more sources