Oil Derricks Information

Oil derricks are load-bearing structures used to support and position a drill string over an oil well. They are considered permanent structures and are typically used in offshore drilling applications. Most derricks take the form of a tall tower which extends above drilling operations. A crown block, the stationary section of a block and tackle, sits on top of the derricks connecting the load of the drill string to the support structure.

Oil derrick schematic via Wikimedia Commons

Oil derrick schematic. Image credit: Wikipedia Commons

Types

Oil derricks are manufactured to suit a particular rig operation such as jack-ups, platforms, semi-submersibles, or drill ships.  Types of derricks include basket, breast, gin pole, guy and stiffleg.

Specifications

Common derrick specifications include:

  • Height
  • Maximum sustainable wind speed
  • Maximum load
  • Base square footage

Standards

API SPEC 4F – A specification by the American Petroleum Institute (API) that states requirements and a uniform method for rating steel structure used for drilling and well servicing operations.

Image credit:

Wikimedia Commons



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