In Australia, just like with other countries, drill rigs are a great help in many situations. But they come in different types. This is why before using one for a specific purpose, you need to know the different types first. Each of them performs a specific role, but they are generally classified as onshore or land and offshore or marine.
“Jackknife” Derrick Type
This type allows the derrick to be setup on the ground. It is then raised into a vertical position using the power from draw works or from a hoisting system. The structures have prefabricated sections that are eventually moved to the location by barge, truck, or helicopter.
This one is a self-elevating kind of rig and is often used for shallower and smaller offshore deposits. It has floating platforms that are towed into the desired positions using barges. The support legs are then lowered to the sea floor to raise the rig higher than the surface of the water.
This type of structure often delivers excellent performance. It is also highly durable and is suited for arctic and harsh environment. It can even carry heavy topsides. Moreover, it offers storage capacities and are highly economical for depths that are more than 150m. For gravity type platforms, there is no need for more fixing due to their larger dimensions of their foundation and high weight.
Compliant Tower Rigs
These ones are similar to fixed platforms because these are anchored to the seabed and it can hold the majority of equipment above the surface level. The design consists of a flexible and narrow tower that is capable of withstanding large lateral surfaces. It is made possible by sustaining great lateral deflections.
As the name says, this equipment is on a barge. It is towed to the site and its hull will be filled with water. This one serves its purpose in swampy and shallow areas and can drill in water with a dept of not more than 12ft.
This one is a larger version and can stand water depths of 18ft- 70ft. It also has its own floating drill unit that comes with pontoons and columns that in case of flood, can cause the pontoons to submerged.
When it comes to offshore drilling types of rigs, this is the most common. It has the quality of submersible rigs and has the ability to drill deep. Basically, this type of rig is not resting on the seafloor. Instead, it has a floating deck that is supported by submerged pontoons and stays stationary by mooring lines and anchors or position-keeping propellers in some cases.
These are just a few of the types and structures of drill rigs. There are more of them that you can get to know before starting with a task.