New contractors and crews have entered the industry since this article was first published in 1995.
Browsing: Directional Drilling
Because of their familiarity with the HDD process, workers have, in some instances, found shortcuts to bore planning procedures in order to cut their pre-bore time.
The following happens as the pump crankshaft makes one complete revolution: As the piston or plunger moves away from the pumping chamber (i.e. suction stroke), the liquid within the pumping chamber expands and the chamber pressure falls.
Underground utilities and the HDD industry have mixed liked oil and water since the industry’s inception. Accusations and complaints — both real and imagined — have been hurled back and forth between the utility industry and the drilling contractors.
In the past months, I have received numerous calls regarding used pumps.
In the April 2003 issue of Trenchless Technology, Christopher Proulx of TBE Group Inc. discussed the evolution of ground penetrating radar (GPR) as a tool for the detection of subsurface infrastructure.
Loss of returns, flow or circulation can be a problem in HDD installations. Zones of high porosity/permeability, natural fractures, rubble zones, gravel and natural voids can all cause loss of drilling fluid to the formation.
Locating is an integral part of any horizontal directional drilling operation, but is often viewed as the “black magic” part of the operation, since many people do not fully understand how the locating system functions.
Viscosity can be a misunderstood drilling fluid property when horizontal directional drilling (HDD) is concerned.
Today more than ever, excellent management of an HDD company is needed in order to be in the black at the end of the year.
The preparation for a gravity sewer bore will sometimes take longer than the actual bore. All of the HDD locating manufacturing companies will first stress patience.
One of the most important aspects of any HDD project is the planning that goes on before the job is started.
What happens at calibration and what is being calibrated are two of the more commonly misunderstood aspects of a locating system.
Either you have had the unfortunate personal experience of, or could imagine the dangers of, the common practice of using a pipe wrench and backhoe to unscrew a threaded tool or pipe connection on the exit side of an HDD bore.
Construction professionals understand the importance of not damaging buried utilities while performing any type of new construction and maintenance work.
A mud motor is no more effective than the volume of fluid that is pumped through it, which generates power.
It was virtually unthinkable to drill solid rock eight to 10 years ago with a mid-size or smaller HDD machine.
There is more solids removal equipment used in the HDD industry today than ever before. This is causing some problems.
For the purposes of this article, we will assume that the water crossing will take place using a walkover locating system.