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• Trip
  ...use the well is about to enter a zone whose conditions require a different bit type. This process of puling all the pipe (and then running it all back i
  450 bytes (82 words) - 13:57, 12 March 2019
• Rate of penetration
  ...[[Land rigs]]). Kelly height can then be measured and directly related to bit depth. As each foot is drilled, an ink pen on the geolograph places a small ...ill bit. Because the drill string stretches in proportion to the weight on bit (WOB), highly sensitive ROP logs can appear erratic as a result of the dril
  7 KB (1,049 words) - 19:02, 20 January 2022
• Mudlogging: the mudlog
  * Bit number, type, and diameter * Bit run (time per feet drilled)
  5 KB (752 words) - 15:39, 24 January 2022
• Wellbore trajectory
  ...ly'', or ''BHA'', is that portion of the drill string closest to the drill bit. It consists of several components: ...ted above the bit and below the heavy wall and used to apply weight to the bit.
  14 KB (2,167 words) - 20:46, 19 January 2022
• Logging while drilling
  ...ivity, or porosity), drilling parameters (e.g., downhole torque, weight on bit, temperature, or pressure), or geophysical information (look-ahead seismic
  2 KB (206 words) - 21:17, 3 December 2015
• Well planning
  ** Bit dulling plot ...weight on bit (WOB), pump pressure (PP), revolutions per minute (RPM), and bit data
  6 KB (779 words) - 15:09, 24 January 2022
• Fishing
  * Loss of portions of downhole equipment, such as stabilizer fragments and bit cones. A magnet is used to recover small metal pieces from the hole, such as bit cones ([[:file:fishing_fig3.png|Figure 3]]).
  8 KB (1,156 words) - 21:19, 19 January 2022
• Measurement while drilling
  * Weight and torque on bit ...hardware consists of sensors built into a drill collar positioned near the bit ([[:file:measurement-while-drilling_fig1.png|Figure 1]]). Electrical energy
  8 KB (1,083 words) - 21:18, 19 January 2022
• Wellsite math
  | % Hhpb || Percentage of total horsepower expended at bit || % | BHhp || Hydraulic horsepower at the bit || hp
  21 KB (3,142 words) - 15:10, 24 January 2022
• Land rigs
  ...of bit used is dependent on the rock type and drilling conditions. Common [bit type]s include drag, tri-cone, insert, PDC, and diamond. ...amount of [[hole friction]] and the correct amount of weight to put on the bit. The drawworks also transfers power to make up and break out the drill stri
  12 KB (2,020 words) - 16:19, 20 January 2022
• Drilling problems
  ...lizers, large diameter drill collars, and the proper weight applied to the bit will minimize the formation of doglegs. (See [[Wellbore trajectory]].)
  5 KB (732 words) - 21:18, 19 January 2022
• Drilling a well
  ...p the annulus, the space outside of the drill pipe. The mud lubricates the bit, prevents it from getting too hot because of friction, and lifts the drille ...erneath it. Mud passes out through the nozzles in the drill bit, cools the bit, and acts to lift the rock cuttings up to the surface.]]
  15 KB (2,385 words) - 15:05, 1 August 2016
• Pressure prediction: analysis of cuttings
  ...ings are liberated promptly into the mud with a minimum of abrasion by the bit. Consequently, the cuttings have sharp edges and look fresh; they may even ...oken away from the host rock, are likely to be struck several times by the bit teeth before being carried away in the mud. The cuttings will be further br
  5 KB (818 words) - 17:56, 17 February 2022
• Pressure prediction: analysis of well-log and seismic data
  ...e limited (weight on bit, rotary speed, mud properties, pump pressure, and bit type), the major remaining variable that affects [[rate of penetration]] in
  5 KB (733 words) - 17:57, 17 February 2022
• Mudlogging: drill cuttings analysis
  ...eing drilled. The rock fragments are transported by the mudstream from the bit to the surface where they can be “caught” and analyzed (see [[Land rigs * Excessive weight on bit, which results in cuttings being ground into a fine powder
  10 KB (1,482 words) - 15:25, 24 January 2022
• AAPG Wiki:Editing the main page
  The gallery section is a bit different because it uses a template call to build the content. The section
  3 KB (553 words) - 13:43, 1 July 2014
• Conventional coring
  ...e of an outer core barrel that is attached to the drill string, and a core bit ([[:file:conventional-coring_fig1.png|Figure 1]]). As mentioned previously, ...in. in diameter. Heavy duty threads allow more torque to be applied to the bit and improve the margin of safety against tool failure.
  13 KB (1,885 words) - 20:49, 19 January 2022
• Sampling for paleontology
  ...dustry are performed on drill cuttings (fragments of rock cut by the drill bit and circulated to the surface by the mud system). Often, a sample of the dr * Monitor the mechanical effects of different bit types. In particular, diamond and composite (polycrystalline diamond compos
  7 KB (1,051 words) - 18:08, 24 January 2022
• Microfossils in exploration
  ...redict [[Overpressure causes|overpressured]] zones in advance of the drill bit.
  4 KB (483 words) - 15:15, 31 January 2022
• Pressure detection
  ...ehole due to the swelling (stress relief) of the borehole walls behind the bit ...ation''—by raising the mud weight to control the formation pressure at the bit, the formation may rupture. The mud will then run out into a cavity of its
  16 KB (2,450 words) - 21:42, 20 January 2022

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