what is the difference between onshore and offshore oilfield
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The Differences Between Offshore And Onshore Oil Drilling
Oil drilling falls into one of two main categories: offshore and onshore. The location of the drilling is the most obvious difference, but the two types vary in other areas, including cost, profits, timelines for drilling and processes.
oil drilling rig
Both types of drilling have certain advantages over the other, but both are actively used to extract oil to meet the high demands of the world. When you learn how to invest in oil, understanding the differences between onshore and offshore drilling helps you make decisions about your investments a little easier.
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The purpose of oil drilling is to reach trapped oil below the rocky layers. The drilling activities dig deep into those layers to extract the oil safely. This goal is the same, whether the drilling takes place onshore or offshore. Trapped oil is found in various places around the world, including under the bed of oceans, which is why we have offshore drilling facilities.
A fixed platform anchored to the ocean floor is common for shallow water drilling. Rigid tubes connect the wellhead to the platform to carry the oil to the surface. Deepwater drilling requires a floating platform that uses flexible risers to account for the movement that comes with being on the water. The setup includes risers used to push water and gas down to extract the oil. Other risers carry the oil out of the water. Because of the temperature of the water, the risers are designed to keep the oil warm so it continues flowing freely.
Once pumped, the oil is stored or sent directly to the shore via pipelines, depending on the setup.
Equipment Differences
The basic equipment is similar for both onshore and offshore drilling. Both require exploratory equipment, pumps, storage facilities and pipelines to drill and collect the oil.
One major difference for offshore drilling is the need for stability. Onshore drilling provides natural stability in the form of the earth’s hard surface. Once anchored to the ground, the rig remains stable and secure.
offshore drilling stability
Offshore drilling presents much more of a challenge due to the shear depth of the water just to reach the earth’s surface. The force the waves, especially in deep, rough waters, presents major stability issues. This activity requires a manmade working surface to hold the drilling equipment and facilities with some type of anchoring to the ocean floor. These jobs use either fixed or floating platforms, depending on the location. The platforms must remain safe and stable even in deep, rough waters.