The self-propelled units are self-contained, with the engine, hydraulic power, and drilling fluid pump all part of the unit. Mini rigs are mounted on a trailer, truck, or self-propelled track vehicle. Table 1-3 lists the three general categories of drilling rigs used in the industry. The thrust mechanism for the carriage can be a cable, chain, screw, or rack-and-pinion system. The drill drive assembly resides on a carriage that travels under hydraulic power along the frame of the drill rig. HDD drill rigs provide torque, thrust, and pullback to the drill string. The HDD drill rig is used to drill and ream the pilot hole and pull the product pipe back through the hole. Maximum volume of drilling fluid a machine can pump per minute, and spindle revolutions per minuteĪ typical HDD rig is illustrated in Figure 1-4.Thrust and pullback force, stated in pounds.This includes ensuring that appropriate types and quantities of drilling fluids and additives are on hand. Ensure that all the equipment and material required for the HDD project are on hand and in good condition. HDD entry and exit points, should well marked in accordance with the project plans and specifications. The project area, including theġ0 Chapter 1 ■ Introduction to Horizontal Directional Drilling The HDD rig is often tied down using the powered rotating screws located on the front of the drill rig.
#Horizontal directional drilling equipment install#
Fluid recirculating systems often are employed on long bores to install large-diameter pipe.Īfter offloading the HDD rig, it is positioned over the bore path centerline at an adequate distance from the drill entry point to allow the drill bit to enter the ground at the desired location and angle. The fluid mixing system is separate from the drilling rig. The drilling fluid, commonly known as mud, plays an essential role in drilling, back reaming, and product pullback. Back reamers are used to increase the diameter of the pilot hole to the required size to accommodate the diameter of the pipe to be installed. The HDD rig is connected to the cutting bit by the drill string, which is made up individual joints of pipe.
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