Evolution ofOffshore Drilling Units Instructor 2 11/11/2017 Objectives At pletion of this training module the engineer will: Clearly be able to define a rig type with the environment it is best suited to List pro/cons for the many types of rig available 3 11/11/2017 Where did Offshore Drilling Start? In 1897, 38 years after Col. Drake’s well, . Williams drilled a well off a pier in the Santa Barbara Channel. 5 years later there were 150 wells “offshore” California. By 1921 there were steel production piers that ran ½ mile offshore at Rincon and Elwood California. In 1932 a steel pier island (60’ x 90’ with 25’ air gap) was built offshore California to support a drilling rig. In 1938 a field was discovered offshore Texas and another well was drilled to 9,000 ft. off a wooden platform in 1941. 4 11/11/2017 Continued – Where did Offshore Drilling Start? World War II stopped all offshore activity. In 1945 Louisiana had a state lease sale in the bays and near land open waters. This was followed by drilling off wooden piers with a considerable amount of coring from barges. In 1955 California passed the Cunningham-Shell Act allowing oil and gas production offshore in state waters. Prior to this coring was allowed: however, no drilling could be done through hydrocarbon formations. 5 11/11/2017 Classes of offshore rigs 2 classes Bottom Supported Floating Bottom Moored Dynamically Positioned 6 11/11/2017 Bottom Supported Rigs Submersibles Barge design Column design Jack-ups Mat supported Independent leg Slot type Cantilever type Platforms Steel jacket Gravity structure Hybrid pliant tower Tension leg platform 7 11/11/2017 Floating Rigs Bottom Moored Drilling tender Drilling barge Drill ship Conventionally moored Turret moored Semi-submersible Spar/Truss Dynamically Positioned Drill ship Semi-submersible 8 11/11/2017 Submersible: Barge 6m water Sits on bottom Used in still waters (not rivers) Derrick can be levelled Deck may sit o
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