Do People Drill For Oil If It's Not Easy To Clean

We are fond to oil: we consume about thirty,000,000,000 barrels of it per year (a volume of iv.8 cubic kilometres). The trouble is that it'south getting harder and harder to discover. Back in the 19th century at that place were places in the earth where information technology just oozed naturally out of the ground. If you wanted an oil well, all you had to do is pick up your shovel and dig a pigsty! Those days are long gone. Now we have to drill for oil in more and more than hostile places similar the deserts of Africa and the frozen chill wastes of Alaska.

Keep on drilling...and drilling...

Drilling for oil in these places is quite risky equally information technology's possible to hit an overpressure at any time.

That blows - literally!

An overpressure is a high-pressured pocket of oil or gas. The pressure level can be so high that it can squirt the drill pipe clean out of the pigsty with plenty strength to take the whole drilling rig with it. This is known as a accident out and tin can be a bit unnerving to say the least.

To cease this happening, a very dumbo mixture of heavy minerals known as mud is poured into the hole. The weight of the mud provides a massive pressure designed to residuum the pressure of the oil or gas pushing upwards. This is usually enough to contain information technology. If information technology isn't the next, and frequently the terminal, line of defence is the blowout preventer (BOP).

Bop information technology!

The BOP is a behemothic stack of 'close-off valves' that close if the weight of the mud cannot contain the over force per unit area. They tin can be huge structures weighing up to 500 tonnes. If they're working properly, behemothic hydraulic rams seal the well a few seconds afterwards.

The drilling challenge!

As oil gets scarcer and more valuable, oil companies are drilling in fifty-fifty more challenging environments such as the deep bounding main. This is the most challenging of all. Britain pioneered ocean drilling dorsum in the 1970s. The off shore fields of the North Sea still provide Britain with a thousand million barrels of oil per year.

Back then drilling in 300ft of water needed all the engineering and expertise Britain could throw at it. Even today information technology's still not an easy environment to work in. Some of the largest and most elaborate structures made by man are oil platforms working in the North Ocean. Back so it was easy peasy compared to where oil companies are working now.

In the Gulf of United mexican states rigs are drilling in seas over 5000ft deep. That's a mile of water earlier you even start drilling into the earth! And then how do the engineers get the accident out preventers past all that water in time? They take to be on the sea bed on these rigs. At this depth, the environment is more hostile than even the surface of the moon.

Why is it so hostile downwardly in that location?

• The pressure level that deep down under the water is 147 times more than than what it is at the surface
• No human defined tin can operate there, the pressure level is lethal
• But remote controlled submarines tin survive
• Information technology is pitch black that deep underwater
• No light tin can penetrate that far
• It is really cold down there. Very icy waters!

And so what happens when things get wrong?

The Deepwater Horizon rig in the Gulf of Mexico was all over the headlines because it striking an overpressure and the weight of the mud could not contain information technology. But that'due south non all. What else happened?

• The BOPs failed
• A supersonic nail of oil and gas raged up the hole expanding and accelerating all the time
• The explosion and fire that happened killed 11 people
• It started one of the worst oil spills in history

The question everyone's asking is, why did the BOPs fail?

How was the leak stopped?

This is the 64 billion dollar question. The cardinal to agreement why it was and then hard to plug the leak is to appreciate how hostile it is downwards in that location. No 1 seems to have contemplated the prospect of catastrophic failure with a rig operating in such deep water. It was very difficult to control the leak because the end of the riser pipe that is used to get from the BOP on the ocean bed to rig on the surface was 5000ft underwater and gushed about 200,000 gallons of crude oil into the sea every day.

First...deadening the leak downwardly

The first attempt to slow downwards the leak was to prop an enormous steel and physical funnel over the primary leak and channel the oil up a pipage to the surface where it could be pumped into a tanker and taken to shore. But that didn't work. The very low temperature of the water at that depth caused the oil to congeal into a kind of frozen sludge that simply blocked the funnel.

What else was washed?

The side by side attempt involved feeding a new tube into the sometime pipe and pumping in a goopy mixture of old tyres and physical to try and cake the pipe. This also failed.

What adjacent?

The final option was to drill a relief well. Information technology was a long drawn out, very difficult job. To succeed in doing this engineers dropped 5000 feet of drill string down to the sea bed. And so they drilled a farther 18,000ft through solid rock. Finally, they drilled sideways into a target pipe a few metres across. Easy.

NOT!

This took around iii months. An awful lot of oil found its way into the environs by that time and the Deepwater Horizon spill concluded upwardly being the largest acciedental marine oil spill in the history of the petroleum industry. The consequence on the nearby marine habitats and the Gulf of Mexico'south angling and tourism industries was devastating.

Source: http://www.planet-science.com/categories/over-11s/natural-world/2010/11/findingoil.aspx

Posted by: balesvilly1962.blogspot.com

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