Drilling Derrick

Drilling Derrick

 

an elevated structure (usually of metal construction) over a well for lowering and raising drilling tools, face motors, casing pipes, and other equipment. The drilling derrick is generally rigged with a block and tackle, mechanized hoisting and lowering equipment, and drill-pipe holder.

The height of a drilling derrick depends on the planned well depth; derricks with a height of 9-58 m are used. Derricks are constructed from wooden beams (for shallow wells), pipes, or section rolled steel in the form of a trihedral, tetrahedral, or truncated pyramid or an A-shape (see Figure 1). Depending on the terrain and distance, drilling derricks may be transported fully assembled on trucks or by means of tractors, or they can be dismantled into separate sections for erection at a new site.

Figure 1. Drilling derricks

References in periodicals archive ?
M2 PRESSWIRE-August 27, 2019-: Global Oilfield Drilling Derrick & Mast Market by Application & Geography (2019-2023)
Drill ships that are used for offshore upstream operations are equipped with a drilling derrick and moon pool.
A massive drilling derrick is pictured on BP's Thunder Horse Oil Platform in the Gulf of Mexico, 150 miles from the Louisiana coast, May 11, 2017.
Zhou, "Simulation model for ultimate bearing capacity of in-service oil drilling derrick," Shiyou Xuebao/Acta Petrolei Sinica, vol.
Scientists used a barge with a drilling derrick to bore a shallow test hole into the ocean crust, but the engineering challenge was far more expensive than anticipated, and the project abruptly ended when Congress cut off funding.
With a twin tower drilling derrick over a centrally located moon pool, the Fugro Scout supports automated pipe and tool handling equipment to promote safe drill floor operations.
The vessel's drilling derrick contains two drilling stations capable of a variety of simultaneous operations to improve efficiency.
It can also be used on installations with non-serviceable, or non-existing drilling derrick sets.
While Shell has not yet released a report on the damage, several engineers speculate that Mars's drilling derrick was not secured well enough.
The team will build a 43-meter-tall drilling derrick on the mountainside some 850 meters above sea level and 1,300 meters northwest of the lava dome of Fugen, Mt.
The job involved the transportation of a 500 t drilling derrick measuring 60 m tall and 11 m wide with the use of a 1,200 t capacity floating crane in the midst of snow showers and strong winds.
The actress and six other activists scaled a 53-meter (174-foot) drilling derrick on the ship, which was contracted to Anglo-Dutch energy giant Shell, and were eventually arrested by police after refusing to come down.