By David Willoughby
Accomplished assurance of horizontal directional drilling (HDD) applied sciences and applicationsAn crucial source for somebody operating within the trenchless undefined, this authoritative advisor presents entire technical info at the layout, allowing, development bid files, requisites, and development of HDD functions. Horizontal Directional Drilling good points many examples and HDD calculations in addition to precise illustrations. insurance of the HDD version pictures agreement - directions for HDD tasks, instance necessities, and data on probability reduction-is additionally included.Details on HDD implementations together with: * metal pipelines * Fiber optic and electric conduits * Municipal purposes for average fuel, water, and wastewater pipelines
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Additional info for Horizontal Directional Drilling: Utility and Pipeline Applications
Example text
HDD crossings in soft or hard rock normally require at least two additional passes. The prereaming duration can be determined by dividing the length of the HDD crossing by the penetration rate to establish the actual reaming time, then adding two minutes per drill pipe joint for retooling. This gives the duration for a single prereaming pass, which is multiplied by the number of passes to give a total duration for the prereaming operation. The pull-back penetration rate is the speed at which the pipe is being pulled into the reamed hole.
All rights reserved. Any use is subject to the Terms of Use as given at the website. ) 55 FIGURE 3-14 Tri-Cone Rock Bits Down-Hole Tools Down-hole tools include mud motors, mechanically driven assemblies, percussive drilling assemblies, reamers, hole openers, and specialized tools such as fishing tools, stabilizers, non-magnetic collars, bent subs, washover pipe, and washover shoes. Down-Hole Mud Motors With high-capacity pumps and HDD rigs with higher drilling-fluid-flow capacities, the down-hole mud motor has become the tool of choice for directionally drilling in rock.
4. Sand: particles of rock that will pass a No. 4 sieve and be retained on a No. S. standard sieve. There are three subdivisions: coarse will pass a No. 4 sieve and be retained on a No. 10 sieve; medium will pass a No. 10 sieve and be retained on a No. 40 sieve; and fine will pass a No. 40 sieve and be retained on a No. 200 sieve. 5. Silt: particles that will pass a No. S. standard sieve that is non-plastic or slightly plastic and that exhibits little or no strength when air-dry. 6. Clay: particles that will pass a No.