The drilling process begins when researchers at an energy company identified a possible offshore oil field or on land. drilling rights are obtained and then proceed to prepare for exploratory drilling. They are conducted seismic tests indicating the depth, chemical relationship, and identification of possible existing suunto.
PHASE 1: EXPLORATION
A mobile drilling rig to the site to obtain a core sample is sent, geologists analyzed for actual information of training taken,
at different depths. The platform typically exploratory drilling wells drilled several time, this in order to locate the areas where hydrocarbon is subsequently come development wells each taking a couple of months to complete. A positive finding (called a “show”) is followed by more exploratory wells to check the quality before taking the next step: the drilling of more elaborate production.
PHASE 2: DRILLING
A drill bit is attached to a “drill string” made of drillpipe segments, each approximately 30 ‘long. The wick is immersed – sometimes to a depth of varioskilómetros- until the bottom is. The drill is rotated by a turntable on the floor of the platform, Maersk Drilling Venezuela, this system is carried by the top drive, which allows you to rotate the drill string and drill grinding its way down (sometimes also horizontal direction) additional lengths of drill pipe are attached.
For cooling, cleaning and stabilizing the pressure, a “drilling fluid” is pumped through the drill pipe internally, and out through nozzles in the drill bit at high speed. The fluid is generally a mixture of water, clay, barite and chemicals, may be water-based or oil. Back on the platform, the fluid is recycled through a circulation system that disperses the crushed rock and reuses the fluid.
PHASE 3: WELL COMPLETION
When the drill reaches the depth indicated by the geologist, the production casing is lowered into the well and cemented in place. At the bottom, small explosive charges make small holes that allow oil or gas to flow into the well, while controlling the pressure.
Once a well is “alive”, the drilling rig is usually replaced by a production platform, they meet on site using a barge equipped with heavy lift cranes. An average well can last for decades, so offshore production platforms are built out with a long stay in the mind.