Offshore drilling


An onshore job is also more attractive for the aging workforce in the petroleum industry , at least in the western world. Das ist Fantastisch photo gallery. In the early s, the Texas Co. Controversies include the ongoing U. Subsea installations help to exploit resources at progressively deeper waters—locations which had been inaccessible—and overcome challenges posed by sea ice such as in the Barents Sea.

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Around , the first submerged oil wells in salt water were drilled in the portion of the Summerland field extending under the Santa Barbara Channel in California. The wells were drilled from piers extending from land out into the channel.

Other notable early submerged drilling activities occurred on the Canadian side of Lake Erie in the s and Caddo Lake in Louisiana in the s.

Shortly thereafter wells were drilled in tidal zones along the Texas and Louisiana gulf coast. In the s drilling activities occurred from concrete platforms in Venezuela 's Lake Maracaibo. One of the oldest subsea wells is the Bibi Eibat well, which came on stream in in Azerbaijan. In the early s, the Texas Co. In , Humble Oil built a mile-long wooden trestle with railway tracks into the sea at McFadden Beach on the Gulf of Mexico, placing a derrick at its end - this was later destroyed by a hurricane.

In , concern for American control of its offshore oil reserves caused President Harry Truman to issue an Executive Order unilaterally extending American territory to the edge of its continental shelf, an act that effectively ended the 3-mile limit " freedom of the seas " regime.

In early , Superior Oil erected a drilling and production platform in 20 feet 6. In any case, that made Kerr-McGee's well the first oil discovery drilled out of sight of land.

The first semi-submersible resulted from an unexpected observation in As the pontoons were not sufficiently buoyant to support the weight of the rig and its consumables, it was towed between locations at a draught midway between the top of the pontoons and the underside of the deck.

It was noticed that the motions at this draught were very small, and Blue Water Drilling and Shell jointly decided to try operating the rig in the floating mode. The concept of an anchored, stable floating deep-sea platform had been designed and tested back in the s by Edward Robert Armstrong for the purpose of operating aircraft with an invention known as the 'seadrome'. The first purpose-built drilling semi-submersible Ocean Driller was launched in Since then, many semi-submersibles have been purpose-designed for the drilling industry mobile offshore fleet.

As of June, , there were over mobile offshore drilling rigs Jackups, semisubs, drillships, barges available for service in the competitive rig fleet. One of the world's deepest hubs is currently the Perdido in the Gulf of Mexico, floating in 2, meters of water. Offshore oil and gas production is more challenging than land-based installations due to the remote and harsher environment. Much of the innovation in the offshore petroleum sector concerns overcoming these challenges, including the need to provide very large production facilities.

Production and drilling facilities may be very large and a large investment, such as the Troll A platform standing on a depth of meters.

Another type of offshore platform may float with a mooring system to maintain it on location. While a floating system may be lower cost in deeper waters than a fixed platform, the dynamic nature of the platforms introduces many challenges for the drilling and production facilities. The ocean can add several thousand meters or more to the fluid column. The addition increases the equivalent circulating density and downhole pressures in drilling wells, as well as the energy needed to lift produced fluids for separation on the platform.

The trend today is to conduct more of the production operations subsea , by separating water from oil and re-injecting it rather than pumping it up to a platform, or by flowing to onshore, with no installations visible above the sea.

Subsea installations help to exploit resources at progressively deeper waters—locations which had been inaccessible—and overcome challenges posed by sea ice such as in the Barents Sea. One such challenge in shallower environments is seabed gouging by drifting ice features means of protecting offshore installations against ice action includes burial in the seabed.

Offshore manned facilities also present logistics and human resources challenges. An offshore oil platform is a small community in itself with cafeteria, sleeping quarters, management and other support functions.

In the North Sea, staff members are transported by helicopter for a two-week shift. Some anglers find that the added noise or color a bead can provide gives them an advantage in stained or muddied water, because the clicking imitates a crayfish crawling over rocks and debris, while some anglers think that the bead detracts from a realistic presentation considering that most worms will not click.

When fishing in open water without much cover to snag on, the Texpose Rig is a better choice than a Texas Rig because it increases the number of fish hooked. A Texpose rig is set up the same as a Texas rig with the exception that the hook point is pushed all the way through the body of the worm so it is slightly exposed. With a Texas rig, less fish will be hooked than with a Texpose because the hook point is not exposed; however, the occluded point deters hang ups on debris. The Texpose does not increase bite rate, but its exposed point betters the chance a biting fish will be hooked.

The Texas Rig is not a search rig like a spinnerbait or a crankbait. It is usually fished by casting as close to cover as possible with the goal of placing the worm as close to a bass as possible. Try to let the lure enter the water with as little noise as possible and keep some controlled slack in the line as bass will commonly attack the lure while it is sinking to the bottom.

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