Results 21 to 30 of about 527,112 (222)

Simulation and Experimental Study on Cuttings-Carrying for Reverse Circulation Horizontal Directional Drilling with Dual Drill Pipes

Advances in Civil Engineering, 2019
In the past decades, horizontal directional drilling (HDD) has been successfully used to install various pipelines in different strata. However, construction accidents such as drill-burying and drill-sticking occur occasionally when pipelines installed ...
Lingrong Kong, Yu Wang, Bohong Wu, Zhiqiao Wang   +3 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
Cui G, Cao P, Wang M, Wang X, Chen D, Qi B.   +5 more
europepmc   +2 more sources

Mathematical model of velocity and distribution law in gas lift reverse circulation well washing flow field for drilling shaft sinking. [PDF]

Sci Rep
Guo L, Cheng H, Yao Z, Rong C, Lin J, Wang X.   +5 more
europepmc   +2 more sources

Design Method of Center Pipe Embedded in Reverse Circulation Sampling Pipe Used in Coal Mine

Meikuang Anquan, 2020
Based on the classification and principle of pneumatic conveying system, the technical characteristics of reverse circulation fixed-point sampling device in underground coal mine are analyzed.
ZHANG Rui
doaj   +1 more source

Experimental and Numerical Study on Air Flow Behavior for a Novel Retractable Reverse Circulation Drill Bit of Casing-while-Drilling (CwD)

Geofluids, 2021
A reverse circulation Down-The-Hole (DTH) hammer drill bit in Casing-while-Drilling (CwD) processes is designed and applied to drilling under complicated formation.
Bo Qi, Pinlu Cao, He Yang, Wenbo He, Mengke Wang, Baoyi Chen, Kun Bo, Zhichuan Zheng   +7 more
doaj   +1 more source

Reverse Circulation Drilling Method Based on a Supersonic Nozzle for Dust Control

Applied Sciences, 2016
To reduce dust generated from drilling processes, a reverse circulation drilling method based on a supersonic nozzle is proposed. The suction performance is evaluated by the entrainment ratio.
Dongyu Wu, Kun Yin, Qilei Yin, Xinxin Zhang, Jingqing Cheng, Dong Ge, Pengfei Zhang   +6 more
doaj   +1 more source

Reversal of pulmonary circulation

The Journal of Thoracic and Cardiovascular Surgery, 1975
The preliminary results and the technique of total reversal of the pulmonary circulation (RPC) are presented. Total RPC is technically feasible and not incompatible with life. It affords a new experimental model for in vivo study of pulmonary pathophysiology.
Mustafa H. Adatepe, Theodosios J. Dosios, F. Thevoz, Leonard P. Merkow, Don L. Fisher, George J. Magovern   +5 more
openaire   +3 more sources

Determinants of reversible asynergy. The native coronary circulation. [PDF]

Circulation, 1975
To evaluate the influence of the native coronary circulation on the reversibility of asynergy, ventriculograms before and after sublingual nitroglycerin were performed in 51 patients with coronary artery disease and asynergy. The severity of stenotic lesions and caliber of the distal coronary vessels were determined by comparison with external catheter
Richard H. Helfant, Monty M. Bodenheimer, Vidya S. Banka   +2 more
openaire   +3 more sources

Effect of Axial Agitator Configuration (Up-Pumping, Down-Pumping, Reverse Rotation) on Flow Patterns Generated in Stirred Vessels [PDF]

, 2001
Single phase turbulent flow in a tank stirred with two different axial impellers - a pitched blade turbine (PBT) and a Mixel TT (MTT)- has been studied using Laser Doppler Velocimetry. The effect of the agitator configuration, i.e.
C. Xuereb, D.F. Fletcher, Hari-Prajitno, J. Aubin, J. Bertrand, Jaworski, Jaworski, Kaufman, Kuboi, Mavros, Mavros, Mavros, Meyers, Mishra, Nienow, Nienow, Nienow, Nienow, Nienow, Ozcan-Taskin, P. Mavros, Ranade, Tatterson   +22 more
core   +1 more source

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   +1 more source