Draw-works

Draw-works

A draw-works is the primary hoisting machinery that is a component of a rotary drilling rig. Its main function is to provide a means of raising and lowering the traveling blocks. The wire-rope drilling line winds on the drawworks drum and extends to the crown block and traveling blocks, allowing the drill string to be moved up and down as the drum turns. The segment of drilling line from the draw-works to the crown block is called the "fast line". The drilling line then enters the sheaves of the crown block and is makes several passes between the crown block and traveling block pulleys for mechanical advantage. The line then exits the last sheave on the crown block and is fastened to a derrick leg on the other side of the rig floor. This section of drilling line is called the "dead line".

A modern draw-works consists of five main parts: the drum, the motor(s), the reduction gear, the brake, and the auxiliary brake. The motors can be AC or DC-motors, or the draw-works may be connected directly to diesel engines using metal chain-like belts. The number of gears could be one, two or three speed combinations. The main brake, usually operated manually by a long handle, may be friction band brake, a disc brake or a modified clutch. It serves as a parking brake when no motion is desired. The auxiliary brake is connected to the drum, and absorbs the energy released as heavy loads are lowered. This brake may use eddy current rotors or water-turbine-like apparatus to convert to heat the kinetic energy of a downward-moving load being stopped.

Power catheads (winches) located on each side provide the means of actuating the tongs used to couple and uncouple threaded pipe members. Outboard catheads can be used manually with ropes for various small hoisting jobs around the rig.

The drawworks often has a pulley drive arrangement on the front side to provide turning power to the rotary table, although on many rigs the rotary table is independently powered.

External links

Manufacturers

  • LeTourneau Technologies – Drilling Rig and Draw-Works Manufacturer
  • Bentec GmbH – Drilling Rig and Draw-Works Manufacturer
  • NOV – Drilling Rig and Draw-Works Manufacturer
  • [1] – Drilling equipment sales and repair

Wikimedia Foundation. 2010.

Игры ⚽ Поможем написать курсовую

Look at other dictionaries:

  • draw works — noun plural but singular or plural in construction : an oil well drilling apparatus that consists of a countershaft and drum and that is used for supplying driving power and lifting heavy objects * * * draw works, equipment used to lower and… …   Useful english dictionary

  • Draw Breath — Studio album by The Nels Cline Singers Released June 26, 2007 Recorded January 7, 2007 February 24, 2007 Genre …   Wikipedia

  • Draw the Line (Aerosmith Tribute Band) — Infobox Musical artist Name = Draw the Line Img capt = Img size = Landscape = yes Background = cover band Alias = Origin = Hingham, Massachusetts, USA Genre = Hard rock Tribute Years active = Label = Associated acts = Aerosmith URL =… …   Wikipedia

  • Works for keyboard by J.S. Bach — The keyboard works of the German composer Johann Sebastian Bach, originally written for organ, clavichord, and harpsichord, are among the most important and well known of his compositions. Widely varied and ranging over the entire span of his… …   Wikipedia

  • How to Draw Manga — is a series of instructional books on drawing manga published by Graphic sha, by a variety of authors. Originally in Japanese for the Japanese market, many volumes have been translated into English and published in the US. Of the wide range of… …   Wikipedia

  • Chasys Draw IES — Developer(s) John Paul Chacha s Lab [1] Stable release 3.66.02 / 5 September 2011; 51 days ago (2011 09 05) Operating system …   Wikipedia

  • Everybody Draw Mohammed Day — Cartoon, Everybody Draw Mohammed Day! Everybody Draw Mohammed Day was an event held on 20 May 2010 in support of free speech and freedom of artistic express …   Wikipedia

  • Delta Works — Overview of the Delta Works The Delta Works is a series of construction projects in the southwest of the Netherlands to protect a large area of land around the Rhine Meuse Scheldt delta from the sea. The works consist of dams, sluices, locks,… …   Wikipedia

  • harbours and sea works — Introduction harbour also spelled  harbor        any part of a body of water and the manmade structures surrounding it that sufficiently shelters a vessel from wind, waves, and currents, enabling safe anchorage or the discharge and loading of… …   Universalium

  • The Works Art & Design Festival — is a thirteen day celebration held at the end of June and the beginning of July in downtown, Edmonton, Canada. The festival displays the work of artists and designers from across Canada as well as featured exhibits from international presenters.… …   Wikipedia

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”