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• Wireline formation testers
  ...ade. Prior to activating the tool, the pressure gauge measures hydrostatic mud column pressure. Upon activation, the equalizing valve is shut and the pack ...set, the equalizing valve is open and the recorded pressure is hydrostatic mud column pressure. During the drawdown associated with the first pretest, the
  10 KB (1,446 words) - 17:42, 18 January 2022
• Pressure prediction: analysis of well-log and seismic data
  ...e of their low permeabilities, shales do not equilibrate pressure with the mud column in the well bore. Selecting only the purest shales minimizes the eff ...ormal pressure. If the variables are limited (weight on bit, rotary speed, mud properties, pump pressure, and bit type), the major remaining variable that
  5 KB (733 words) - 17:57, 17 February 2022
• Carbonate sedimentary rocks classification
  * Microcrystalline lime mud: matrix component of the rock < 4 μm in size. ...alline allochemical limestone that consists of > 10% allochems within lime mud.
  16 KB (1,986 words) - 14:09, 19 December 2023
• Well planning
  ** Lost circulation zones (e.g., fractures, excessive mud weight) * Mud logging
  6 KB (779 words) - 15:09, 24 January 2022
• Mudlogging: equipment, services, and personnel
  * ''Blender''—A blender agitates and grinds a discrete sample of mud and cuttings and extracts the released gas for measurement. * ''Pump rate counter''—A pump stroke counter is needed for each mud pump
  8 KB (1,031 words) - 15:27, 24 January 2022
• Show evaluation
  ...e drill string. This reading results from the liberation of gases from the mud system or from the recycling of previously encountered gases in the wellbor ...ondition to occur, the contributing formation must be underbalanced by the mud system at some point within the borehole.
  18 KB (2,670 words) - 18:21, 21 January 2022
• Interpreting hydrocarbon shows
  ! Show type || Core or cuttings || Mud log || Sw% || Log analysis || Dst || [[Wireline formation testers|Repeat fo ! Show type || Core or cuttings || Mud log || Sw% || Log analysis || Dst || Rft
  8 KB (1,130 words) - 17:09, 5 April 2022
• Hydrofractured seal leakage
  ...spx fracture gradient], and [[Pressure prediction: analysis of mud weights|mud weight]], well logs, or [[seismic data]] approximate the fluid pressure gra
  5 KB (679 words) - 17:11, 1 February 2022
• Water resistivity determination
  ..., as formation water samples, if available, are invariably contaminated by mud filtrate. ''R''_w is therefore usually calculated, and there are ...meable zones containing a more saline interstitial water than the drilling mud (''R''_w R_mf).
  13 KB (2,077 words) - 17:26, 18 January 2022
• Pressure detection
  ...ssure'' refers to pressures higher than normal that require heavy drilling mud to keep formation fluids from entering the borehole. Pressures lower than n ...control the formation pressure at the bit, the formation may rupture. The mud will then run out into a cavity of its own making.
  16 KB (2,450 words) - 21:42, 20 January 2022
• Formation fluid pressure from drill stem tests
  ...ol and drillpipe string. Recovered volumes of oil, gas, water, or drilling mud are recorded. ...''' is the initial hydrostatic pressure (IHP), the pressure exerted by the mud column in the borehole at the depth where the recorder is located.
  6 KB (997 words) - 17:55, 17 February 2022
• Sampling for paleontology
  ...ragments of rock cut by the drill bit and circulated to the surface by the mud system). Often, a sample of the drill cuttings is collected for each joint * Lost-circulation material added to the mud system can so dilute the system that little or no formation material is con
  7 KB (1,051 words) - 18:08, 24 January 2022
• Preprocessing of logging data
  ...model used on each well and logging run. Collect all temperature data and mud properties. Determine the top and bottom of the valid logging measurements ...of environmental conditions (such as hole washouts or gas in the drilling mud) should also be deleted. This will result in data gaps, but these are prefe
  13 KB (2,094 words) - 17:42, 18 January 2022
• Measurement while drilling
  ...Downhole measurements recorded by the sensors are transmitted through the mud as positive or negative pressure pulses or as a continuous, fixed-frequency The mud telemetry signals are detected with pressure transducers in the standpipe.
  8 KB (1,083 words) - 21:18, 19 January 2022
• Shale tectonics
  ...intrusive injectites or [[diapir]]s or as extrusive eruptive sand blows or mud volcanoes has captured the public's imagination and given scientists the im ...these strata can be found as well as documentation on drilling into mobile mud-cored anticlinal features (diapirs) in southern Trinidad.
  17 KB (2,466 words) - 16:16, 10 January 2024
• Formation evaluation of naturally fractured reservoirs
  ...adially through the formation via the mud and back to the receiver via the mud. ...pip most likely corresponds to a streaming potential effect resulting from mud filtrate into the fractures.
  9 KB (1,380 words) - 17:25, 18 January 2022
• Methods for obtaining formation fluid pressures
  * Using the weight of drilling mud
  2 KB (295 words) - 17:54, 17 February 2022
• Sea level cycles and carbonate sequences
  ...he tops of supratidal flats during highstand conditions. The thin marl and mud-cracked laminites indicate little available accommodation space was availab
  7 KB (989 words) - 20:45, 6 April 2022
• Open hole tools
  ..._w , and indicate [[permeability]] || Does not work in oil-based mud and ''R''_mf and ''R''_w must contrast ...Identify lithology and well-to-well correlation || Does not work in barite mud, is a pad device, and uses a radioactive source
  23 KB (3,350 words) - 17:26, 18 January 2022
• Borehole gravity: uses, advantages, and disadvantages
  * Is unaffected by [[washout]]s, [[hole rugosity]], or [[mud invasion]] effects
  3 KB (351 words) - 15:11, 31 January 2022

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