The 5 Different Types of Oil Rigs - Maritime Injury Lawyers

There are many types of offshore platforms used for oil and gas drilling and exploration. Some of these are fixed to the ocean floor and others are floating platforms or vessels. Each is designed for different water depths and purposes. Some floating production systems may include storage or refinery facilities and employ hundreds of maritime workers.

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There are 5 main types of drilling platforms, each with several unique variations.

#1 Barge Rigs

Barge rigs work in shallower waters, usually less than 20 feet deep. After being floated to the drilling location, the hull is brought to rest on the ocean floor, creating a stable platform for drilling. Many barge rigs operate in the Gulf of Mexico and around the world.

#2 Submersible Rigs

In waters too deep for a barge, but less than 50-70 feet deep, a submersible rig can be used.

Columns or posts are submerged into the water and filled to specific levels that determine their depth. Drilling equipment on the platform above drives a floating drill unit below.

#3 Jack-Up Rigs

As we move into deeper waters, a mobile platform called the &#;jack-up&#; rig comes into play. It gets this name because it can be moved directly over the location to drill or pump oil. The rig can be self-elevated (jacked up) from the bottom of the ocean floor to secure it in place. Jack-up rigs are well suited for shallow waters of 400 feet or less.

There are two types of jack-up rigs:

• Cantilevered Jack-up, with a drilling derrick mounted on an extending arm
• Keyway or Slot Jack-up, which has a drilling unit on the platform over an opening it drills through

#4 Platform Rigs

Many offshore oil rigs are anchored platforms. They use a steel framework anchored to the ocean floor as a foundation for a surface drilling rig, equipment, and living quarters. Platforms may drill in many directions from this base, and they are broken down into specific types suited for various depths.

Fixed Platforms

Fixed platforms are made of steel or cement and are intended to be permanent structures. They house large facilities, heavy equipment, and big crews. Most are located on the continental shelf in deep water up to feet.

They can drill directionally with a radius of up to five miles. The platform is held in place by large steel or concrete legs that attach to the ocean floor.

Compliant Towers

When the oil or gas is even deeper, from up to feet, a compliant tower may be used. These structures are made of concrete and steel and are tall and narrow. They are intended to flex and sway with the wind and waves.

Up to feet, they attach firmly to the sea bed, but, for greater depths, a tension leg platform may be used. These towers are technically floating platforms that are secured with a series of anchors and cables. They are fixed but also floating, and they can reach depths of feet.

#5 Floating Rigs or Floaters

In very deep water, it is not practical to attach an offshore rig to the bottom of the ocean. Floating oil rigs are kept in place by anchors or dynamic positioning systems that keep them over target. There are several types of floaters in use at various deep water drilling locations worldwide.

Semi-Submersible Platforms

For deeper waters up to 12,000 feet, the preferred method of exploration and drilling is to use semisubmersibles or drill ships. Semisubmersible work-decks float on top of the water, while the vast majority of their mass is contained below the water to help stabilize the platforms and keep them in place. As a result, the deck is rather stable and well-suited for drilling in rough waters -10,000 feet deep. However, semisubmersibles are not easily moved.

Two notable types of semi-submersible rigs include:

• Sea Star Platforms, which use flexible steel legs rather than anchors, usually in less than feet of water.
• Spar Platforms, which sit on a hollow cylinder that hangs below the water at a depth of approximately 700 feet. This stabilizes the platform, allowing drilling up to 10,000 feet.

Drill Ships

For new exploration and the drilling and capping of new wells, drill ships are typically used. Drill ships have the drilling equipment installed directly on the deck, typically in the middle of the deck. The well is drilled through the &#;moon pool,&#; an opening in the center of the ship. They are kept in place by dynamic positioning.

Worker Safety on All Oil Rigs

Working on any vessel or platform rig carries with it certain risks. Owners and operators of rigs need to take steps to help protect their workers and provide safe working environments. In the event they are negligent and workers are injured, they can be held accountable under maritime law.

If you are an oil rig worker, seaman, or vessel worker and have been injured while in the service of a vessel or ship, you could be entitled to monetary compensation. To find out more about your legal rights and if you have grounds for a personal injury lawsuit or &#;maintenance and cure,&#; contact the Jones Act attorneys at Schechter, Shaffer & Harris, L.L.P.

Drills have different mining functions, from providing geologists with different samples of soil for analysis to facilitating the extraction of precious minerals that would otherwise be difficult to reach.

How many methods of drilling are there?

As the mining industry advances and more excavating opportunities present themselves, the number of drilling methods increases. Whether it is for exploration, production, land-clearing or geotechnical purposes, there are drilling methods that serve every mining purpose.

Auger Drilling

Auger drilling is the simplest form of drilling. It involves the manual rotation of a helical screw into the ground, usually by two people although auger drills can also be mounted to small vehicles. Once the auger drill is deep enough, the earth is lifted up by the blade of the screw. This kind of drill specializes as an initial geochemical reconnaissance technique, which means it is used in softer soil to find the optimal place to mount a larger drill. 

Rotary Air Blasting

Rotary air blasting is the most common shallow drilling method, in which a piston-driven hammer-like object drives the drill bit into the rock, fragmenting the hard surface into chips that are then lifted to the surface via compressed air. This method is ideal for drilling multiple holes in a short period of time, and less ideal for producing geological samples because the airblasting process can compromise the quality of the rock.

Aircore

Aircore drilling involves a three-bladed drill bit with a hollow drill rod in order to penetrate loose soil and rock fragments. After the drilling is complete, compressed air is blasted through the drill rod in order to bring the cuttings to the surface. While this method is typically slower than rotary air blasting, it is more precise, meaning that the samples collected are less prone to contamination.

Reverse Circulation Drilling

Reverse circulation is a popular method for mining exploration that shares similarities with both rotary air blasting and aircore drilling. The same piston-driven hammer is used to drive the drill bit into the rock, however, the larger rigs and machinery associated with reverse circulation drilling allow for the drill bit to be driven even further into the earth. Compressed air is then used to drive the fragmented earth to the surface. This method is ideal for geological exploration, as it produces contaminant-free samples and requires less handling, resulting in cost reduction and faster turnaround times.  

Diamond Core Drilling

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Diamond core drilling is the most expensive drilling method, as it involves using a drill bit that has been fortified with industrial diamonds attached to hollow drill rods to extract a continuous cylinder of rock from several kilometers below the earth. However, this method also produces the most accurate rock samples as the entire core of a mineral can be brought to the surface as opposed to mere fragments, making it ideal for procuring records on their strength, composition, porosity, etc. 

Blast Hole Drilling

Blast hole drilling is a method of drilling used to clear out large amounts of the earth and make the minerals below easier to access. It involves the drilling of holes into the earth. Explosive charges are then placed into each hole and detonated. After the explosion, the broken material is cleared and, if the drilling and blasting occurred underground, the tunnels created by the explosion are fortified to allow for safe human entry. Alternatively to explosives, gas pressure blasting pyrotechnics can also be used to displace the rock for excavation.

What types of drills are there?

As mining operations have become more sophisticated with the passage of time, new kinds of drill rigs have emerged to meet the demand of mining companies. Nowadays, various mining drills utilise different features to complete different kinds of mining tasks while being both manually operated and remotely automated. These rigs are available in various shapes and sizes, functioning in confined spaces as well as large quarries.  As a result, there is a wide array of surface mining drill rigs available for many different kinds of operations. 

Surface Top Hammer Drill Rigs

Top hammer drill rigs are equipped with powerful hydraulic drills as well as a hammer. The hammer strikes the drill rod, creating a percussive force that travels to the drill bit and displaces the rocks, leaving them susceptible to pressurized air or water. This kind of rig is renowned for its reliability in the toughest conditions, as well as its fuel economy and low operating costs. When partnered with the drill and blast method, this drill rig makes the excavation process efficient.

Surface Down-The-Hole Drill Rigs

The purpose of a down-the-hole drill rig is to drill large-diameter holes downwards, consisting of a jackhammer screwed to the bottom of a drill string. Like other drill rigs, the DTH breaks up the rock so it can be flushed out using air or water. This particular rig specializes in high-capacity rock drilling in quarries, opencast mines, and rock excavation projects.

Dimensional Stone Drill Rigs

The dimensional stone drill rig has a more esoteric function that its other drill rig counterparts, in that its purpose is to drill precise holes in the ground in order to excavate for natural rock such as granite, limestone, marble, or sandstone so that it can be extracted and fashioned into blocks for construction. This rig is designed to drill precise holes safely and efficiently.

Rotary Blasthole Drill Rigs

Rotary blasthole drill rigs drill into the earth in order to create holes that can then be filled with explosives that clear large sections of rock for subsequent mining operations. Rotary blasthole drill rigs are renowned for their precision and depth, boosting productivity by making the process of blast hole drilling easier and more cost-effective. In addition to the range of surface mining drill rigs, there is also a wide variety of underground drill rigs available that meet the stricter safety and logistical requirements that underground mining entails. 

Development Drill Rigs

Development drill rigs are mining vehicles that drill holes into the surface of a coalbed that explosives can be inserted into and detonated. These vehicles are modular, meaning they can be disassembled, transported, and reassembled with ease. They can also be used for small-scale mine development and large-scale tunneling.

Tunneling Jumbos

Tunneling jumbos are versatile modular electro-hydraulic excavation machines that can be used for both fast face drilling and mechanized longhole drilling and bolting. Jumbos operate as stationary work stations that an operator safely conducts mining operations from, consisting of one, two or three drock drill carriages, ensuring high productivity and reliability. They are used specifically for underground drilling and blasting jobs, however, they can also be used in tunneling if the hardness of the surrounding rocks prevents the use of tunneling machines.

Top Hammer Longhole Drill Rigs

Top hammer longhole drill rigs are ideal for mining operations where the highest priority is ore recovery and minimizing the contamination of rock fragments. Like its surface mining counterpart, this drill contains a piston-powered hammer that impacts the drill in order to shatter the rock before using compressed air to disperse the debris.

Rock Support Drill Rigs

Rock support drill rigs are engineered to install rock bolts that stabilize the rock face by transferring the load from an unstable mine exterior to the confined (and therefore stronger) interior of the rock mass. These rigs ensure the safety of underground drilling and blasting by securing the rock mass and stopping it from caving in.

In-The-Hole Longhole Drill Rigs

In-The-Hole longhole drill rigs are mounted on tracked or articulated carriers in order to be transported into a mine where it uses extension rods to drill holes and extract ore with the aid of an ITH hammer similar to that of the top hammer drill rig. Additionally, the ITH longhole drill rig also flushes out debris with pressurized water. These rigs are designed with mobility and accuracy in mind.

Low Profile Drill Rigs

Low profile drill rigs are mining drills that are built at a low elevation so they can enter more confined spaces that regular drills cannot due to their size. They are ideal for development, rock support, and production drilling in tabular ore bodies such as platinum and chrome mines. These drills come in single and double boom variants, meaning that their specialization for spaces with low heights does not sacrifice their ability to reach higher spaces if the need be.

Narrow Vein Drill Rigs

Narrow vein drill rigs are similar to low profile drill rigs, in that they are designed to venture into and extract ore from confined spaces. However narrow vein drill rigs are designed less to accommodate height challenges and more for the general navigation of geologically complex mine spaces with widths less than 3-6m. Narrow vein deposits contain large amounts of gold, tin, copper, lead, and zinc that narrow vein drill rigs allow us to access and utilize.

Secondary Breaking Drill Rigs

Secondary breaking drill rigs are compact support drills that increase drawpoint availability in narrow vein mines and back caving operations by breaking oversized boulders that are causing blockages. These drills eliminate the need for explosives, which in turn eliminates the need for time-consuming ventilation and evacuation measures while promoting a safer mining environment. These small drill rigs are available in the form of jumbos, longhole rigs, and drill-charge and drill-split breaking units.

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