This trenchless method of installing pipelines is extremely protective to the environment. It does not involve a large working space and does not disrupt other works as well as urban traffic systems. It can be done at any time of the day and requires a shorter duration for completion, hence it is cost effective as compared to conventional open-trench methods.
The HDD technology involves the use of special drilling tools that can be precisely steered to avoid any obstructions for any pipeline crossing to be completed. This technology is flexible to adapt to any pipe size or length and pipe material necessary to be installed. HDD has been used to install pipelines carrying oil, natural gas, petrochemicals, water, electrical and network cables.
Our Capabilities In HDD
Project Title: Procurement Construction and Commissioning (PCC) of Regasification Terminal 2 Pipeline Project (RGT2P)
client: PBJV Group Sdn Bhd
Completion Year : 2017
Description : 36” Diameter API Gas Pipe
Pipe Length : 600m +850m + 660m = 2110m
Approach: River Crossing
Using a suitable pilot hole drilling BHA (Bottom Hole Assembly), a small diameter pilot hole is drilled from the ground surface. The pilot hole BHA shall spud in at the entry point and drilled into the ground following a predetermined path crossing underneath the elements of obstruction (rivers, lakes, channels, roads, railways, runways, existing tunnels, marsh lands, shorelines and the like). The pilot hole drilling is completed as it punches out of the ground at the designated exit point.
As soon as the pilot hole drilling process is completed, the small diameter pilot hole shall be enlarged to accommodate the intended product pipe. This process shall be done by installing a larger diameter BHA and reaming it (by rotating while pulling or pushing) along the already drilled pilot hole. This process may come in stages / sizes depending on the final HDD borehole diameter designed for the product pipe.
Upon completion of the reaming process, the product pipe shall be pulled in and installed inside the HDD borehole. This process is done by connecting a pulling head to the leading end of the product pipe and attaching the pulling head to the pullback assembly. The pullback assembly, together with the product pipe, shall then be pulled in the HDD borehole by the HDD Rig. The process is completed once the pullback assembly together with the product pipeline reaches the surface at the Rig side. The pullback assembly shall be dismantled from the product pipe for pipe tie-in or other works to follow.