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contractive    
a. 收缩的,有收缩性的



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  • Offshore drilling - Wikipedia
    Offshore drilling is a mechanical process where a wellbore is drilled below the seabed It is typically carried out in order to explore for and subsequently extract petroleum that lies in rock formations beneath the seabed
  • How Offshore Drilling Works - HowStuffWorks
    Offshore drilling means combing Earth for new underwater oil reserves Learn more about offshore drilling and finding oil in the midst of rough seas
  • Offshore oil and natural gas in depth - U. S. Energy . . .
    Early offshore drilling occurred in water less than 300 feet deep Oil and natural gas drilling rigs now operate in water as deep as two miles Offshore oil and natural gas production is much more expensive than onshore (land-based) production
  • Offshore Oil And Gas Drilling: A Comprehensive Guide
    Offshore oil and gas drilling is a complex process that involves drilling into the seabed to extract oil and natural gas reserves The process has been used for decades, with many
  • Offshore Drilling Explained: Technology, Safety, and the . . .
    I What is Offshore Drilling? Offshore drilling is the process of extracting petroleum and natural gas from underground reservoirs located beneath the seabed, typically in oceans, seas, or large lakes It involves the use of specialized platforms or rigs—either fixed to the ocean floor or floating on the water surface—to drill through
  • The Basics of Offshore Oil Gas - NOIA
    Drill ships are ships that have a drilling rig on the top deck The drill operates through a hole in the hull Drill ships can pilot to the drill site and then use a combination of anchors and propellers to correct for drift as the rig drills for oil They can operate in deep water conditions
  • What is offshore drilling? - SurferToday. com
    Offshore drilling is the process of extracting petroleum and natural gas from the seabed using a fixed or mobile platform located off the coast in the open ocean and deepwater regions The mechanical process of drilling oil from the continental was first experimented on in Grand Lake St Marys, Ohio, United States, in 1891





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