Horizontal Directional Drilling

Process and Locating

Process

Starting pit with pilot hole and some drilling fluid in the pit:
The method comprises a three stage process wherein first stage is of drilling a pilot hole on the designed path, second stage is of enlarging the hole by passing a larger cutting tool termed as Reamer the third stage is of placing the product or casing pipe in the enlarged hole. The directional control capabilities assist the rig operator in making necessary changes in the directions of the drilling head.
Horizontal directional drilling is done with the help of a viscous fluid known as drilling fluid. It is a mixture of water and, usually, bentonite or polymer continuously pumped to the cutting head or drill bit to facilitate the removal of cuttings, stabilize the bore hole, cool the cutting head, and lubricate the passage of the product pipe.

Locating and Guidance

Empty conduits laid by directional boring:
Location and guidance of the drilling is very important part of the drilling operation as the drilling head is under the ground while drilling and in most cases not visible from the ground surface. An uncontrolled or unguided drilling can lead to substantial destructions. By properly locating and guiding the drill head such destruction can be avoided. There are two types of locating equipment for locating the bore head: the ‘walk-over’ locating system or a 'wire-line' locating system.
In both of the systems a sonde, or transmitter, behind the bore head registers angle, rotation, direction and temperature data. This information is encoded into an electro-magnetic signal and transmitted through the ground to the surface in a walk-over system. At the surface a receiver (usually a hand-held 'locator') is manually positioned over the sonde, the signal decoded and steering directions are relayed to the bore machine operator. In a wireline system, this information is transmitted through the cable fitted within the drill string. Both systems have their own merits and depending upon the site requirements a particular system is chosen.

	Refer Us \| Request Information \| Download Brochure \| Online Map / Directions
	Copyright © 2008 Global Point Technologies Incorporated	Home \| Contact Us \| Terms and Conditions \| Disclaimer \| Privacy Statement
	Site designed by Viztek Software LLC


	Structured Cabling - Low Voltage Installation specialist	Home Request Information Contact Sitemap Search