Results 191 to 200 of about 1,418 (251)

Research on Navigation Method for Subsea Drilling Robot Based on Inertial Navigation and Odometry. [PDF]

Sensors (Basel)
Liu Y, Zhou P, Xiao F, Li C, Li J, Chen J, Ren Z.   +6 more
europepmc   +1 more source

Mechanism and application of competitive fracture propagation in layered group fracturing of massive thick overburden strata. [PDF]

Sci Rep
Zhang X, Cao Y, Gou Y, Wen S, Huang N, Cho Y.   +5 more
europepmc   +1 more source

Productivity analysis of horizontal directional drilling

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Performance Assessment of On-Grade Horizontal Directional Drilling

Journal of Construction Engineering and Management - ASCE, 2012
Although horizontal directional drilling (HDD) has been widely accepted and used for installing gas lines, waterlines, and telecommunication cables, its applications to gravity-flow sewer lines have been limited. One primary reason is the difficulty with maintaining critical grades essential for gravity-flow sewer systems when using the conventional ...
Saeed Abdollahipour, David Hyung Seok Jeong, Reeti R. Burman, Floyd Gunsaulis   +3 more
exaly   +2 more sources

Modeling of Observability During In-Drilling Alignment for Horizontal Directional Drilling

IEEE Transactions on Instrumentation and Measurement, 2007
Navigation performance is an important factor in horizontal directional drilling. In-drilling alignment (IDA) was previously suggested to improve downhole navigation performance when utilizing an inertial navigation system (INS). It was shown that the IDA process enhances the ability to estimate INS bias and drift errors and, particularly, their ...
Efraim Pecht, Martin P. Mintchev
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Mechanical Analysis of Drill Strings in Horizontal Directional Drilling

ICPTT 2011, 2011
A large number of failure cases on horizontal directional drilling arise from complex forces, difficult mechanical analysis and lack of theoretical basis of construction parameters. So it's of great engineering value to make mechanical properties of horizontal directional drilling clear.
Yihua Dou, Yinping Cao
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Drilling Fluid Pressure Calculation in Horizontal Directional Drilling

ICPTT 2012, 2012
Drilling fluid plays an important role in horizontal directional drilling (HDD). It cuts soil, suspends and transports cutting out of the borehole, it forms filter cake to prevent slurry lose and maintain the borehole stability. During HDD process, reasonable drilling pressure should be controlled.
Jiang Lu, Hongzhou Zhang, Qiang Ma
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Productivity Analysis of Horizontal Directional Drilling

Pipelines 2009, 2009
The National Research Council of Canada reported that rehabilitation of municipal water systems between 1997 and 2012 would cost $28 billion (NRC, 2004). With the rapid increase of new installations, the need for replacement and repair of pipe utilities and also the demand for trenchless excavation methods, increase.
Muhammad Adel, Tarek Zayed
openaire   +1 more source

Usage and Applications of Horizontal Directional Drilling

ICPTT 2012, 2012
Horizontal Directional Drilling (HDD) is the fastest growing trenchless technology for the installation of pipes, conduits, and cables in underground bore-path construction. This is can be referred to the suitability of the technique for different soil conditions (hard and loose soils), applicability in crossing natural barriers such as rivers, lakes ...
Mohmd Sarireh, Mohammad Najafi, Lawrence Slavin   +2 more
openaire   +1 more source