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• Introduction to wellsite methods
  * [[Drilling problems]] * [[Measurement while drilling]]
  763 bytes (76 words) - 20:06, 16 January 2014
• Pressure prediction: analysis of mud weights
  ==Mud weight and pore pressure== ..._problems_with_overpressured_reservoirs|blows out]], the pressure from the mud is less than, but usually close to, pore pressure.
  4 KB (572 words) - 17:56, 17 February 2022
• Drilling problems
  | chapter = Drilling problems ...de any difficulties encountered while [[drilling a well]]. The most common drilling problems are the creation of doglegs and key seats, hole instability, lost
  5 KB (732 words) - 21:18, 19 January 2022
• True resistivity determination
  ..._t) of a formation is its resistivity when not contaminated by [[drilling fluid]]s. It may contain formation water only ([[water saturation]] [S<sub> ...gure number|1}}Resistivity profiles of formations with fresh and saltwater mud filtrate invasion.]]
  3 KB (427 words) - 16:16, 5 April 2022
• Suggested pages
  ** [[Mud drape]] ** [[Mud information - interpretation]]
  2 KB (215 words) - 20:43, 10 August 2015
• Pressure prediction: analysis of cuttings
  ...an normal. This case also applies to shale, so we don't have to wait for a mud kick from a permeable zone to anticipate significant overpressure. Cuttings ...re likely to take place in permeable zones where there is a finite flow of mud filtrate into the formation.
  5 KB (818 words) - 17:56, 17 February 2022
• Rate of penetration
  ...eolograph'', or drilling recorder, mechanically monitors depth and records drilling parameters in time. These parameters are recorded on a paper chart, graduat ...ed. This results in an apparent increase in ROP. It is not unknown for the drilling hands to “gig” or pull on the recording cable, causing a similar appare
  7 KB (1,049 words) - 19:02, 20 January 2022
• Mudlogging: gas extraction and monitoring
  ...gases or a potential blowout condition. Accurate gas data recorded during drilling is of great value in proper reservoir evaluation and may even pinpoint pote ...1.png|{{figure number|1}}Mud system.<ref name=pt03r51>Whittaker, A., 1991, Mud logging handbook: Englewood Cliffs, NJ, Prentice-Hall.</ref>
  9 KB (1,327 words) - 15:28, 24 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 ==Log of drilling rate==
  5 KB (733 words) - 17:57, 17 February 2022
• Drilling fluid
  | chapter = Drilling fluid An essential element of [[drilling a well]] is the drilling fluid or mud. Drilling fluids serve a number of functions:
  13 KB (1,866 words) - 21:17, 19 January 2022
• Mudlogging: the mudlog
  ...es an accurate and up-to-date record of nearly all activity related to the drilling of the well. ...gure 2]] is an example of the layout and information content of a standard mud log. The general usage of the tracks (columns) on a mudlog are outlined her
  5 KB (752 words) - 15:39, 24 January 2022
• Measurement while drilling
  | chapter = Measurement while drilling ...ole evaluation of formation gamma ray, resistivity, and [[porosity]] while drilling is in progress. Mechanical parameters such as the following are also measur
  8 KB (1,083 words) - 21:18, 19 January 2022
• Formation fluid pressure from repeat formation testers
  | Drilling delay to run test || About one logging run (wireline conveyed) || About equ * Screen plugging with material in drilling mud
  6 KB (849 words) - 17:55, 17 February 2022
• Well planning
  ===Drilling program=== * [[Drilling problems]]
  6 KB (779 words) - 15:09, 24 January 2022
• Mudlogging: equipment, services, and personnel
  ...lling process. Mudlogging incorporates gas analysis and cuttings data with drilling information to build a continuous formation evaluation record as the well i * ''Blender''—A blender agitates and grinds a discrete sample of mud and cuttings and extracts the released gas for measurement.
  8 KB (1,031 words) - 15:27, 24 January 2022
• Mudlogging: drill cuttings analysis
  ...illed over a 10-ft interval. The interval length can vary depending on the drilling rate and the detail needed for reservoir and lithological descriptions. Whe When a drilling break or change in background gas occurs, supplemental samples should also
  10 KB (1,482 words) - 15:25, 24 January 2022
• Glossary
  ;DF:derrick floor or drilling fluid ;DM:drilling mud
  5 KB (840 words) - 13:51, 18 March 2019
• Land rigs
  [[File:PinedaleFieldLandRig.png|thumb|400px|Drilling rig in [[Pinedale field]] with the Wind River Mountains, Wyoming, USA in th ...nd mud pumps (34 in [[:file:Land rig example drawing.png|Figure 1]]) while drilling and to the drawworks (15) when [[trip]]ping.
  12 KB (2,020 words) - 16:19, 20 January 2022
• Offshore rigs
  ...er hull keeps the rig from sinking into the soft mud and provides a stable drilling platform. ...tom) to support the [[surface production equipment]], living quarters, and drilling rig ([[:file:offshore-rigs_fig1.png|Figure 1]]). Multiple [[Wellbore trajec
  7 KB (1,016 words) - 16:56, 20 January 2022
• Pressure detection
  ..., 382 p.</ref> Normal pressures range between 0.43 and 0.50 psi/ft. Normal drilling muds weigh about 9 ppg (pounds per gallon) and exert a bottom hole pressure ...ssure'' refers to pressures higher than normal that require heavy drilling mud to keep formation fluids from entering the borehole. Pressures lower than n
  16 KB (2,450 words) - 21:42, 20 January 2022
• Wellsite math
  ...ions increase knowledge of well behavior and facilitate communication with drilling personnel. Definitions of the mathematical variables and abbreviations used | MW || Mud weight || lb/gal
  21 KB (3,142 words) - 15:10, 24 January 2022
• Formation fluid pressure from drill stem tests
  ...gh ports in the tool wall and pressure gauges respond to the weight of the drilling fluid column. The tester valve is closed. ...ol and drillpipe string. Recovered volumes of oil, gas, water, or drilling mud are recorded.
  6 KB (997 words) - 17:55, 17 February 2022
• Show evaluation
  * Knowledge of drilling and wellsite activities ...ocess. Table 1 summarizes the nomenclature of gas that can result from the drilling process. The presence of these gases should not be confused with a “show.
  18 KB (2,670 words) - 18:21, 21 January 2022
• Drilling a well
  | chapter = Drilling a well ...blowout results. Scenes of oilmen dancing with glee as oil gushes over the drilling rig are for the cinema only. In reality, oil field professionals are acutel
  15 KB (2,385 words) - 15:05, 1 August 2016
• 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 ...(which may prevent blowouts), and stopping points (to prevent unnecessary drilling below the objective section).
  7 KB (1,051 words) - 18:08, 24 January 2022
• Wellbore trajectory
  A ''pendulum BHA'' is probably the most often used assembly for drilling a vertical hole. A pendulum BHA is similar to a slick BHA, but contains one ...eerable bottom hole assembly, (b) Kicking off with a bent sub and straight mud motor.]]
  14 KB (2,167 words) - 20:46, 19 January 2022
• Methods for obtaining formation fluid pressures
  * Using the weight of drilling mud
  2 KB (295 words) - 17:54, 17 February 2022
• Interpreting hydrocarbon shows
  Direct indications of hydrocarbons—seen in [[drilling fluid]]s, cuttings, cores, or formation tests—may be of several types:<re ! Show type || Core or cuttings || Mud log || Sw% || Log analysis || Dst || [[Wireline formation testers|Repeat fo
  8 KB (1,130 words) - 17:09, 5 April 2022
• Wellsite safety
  ...ng aware of the surroundings and planning accordingly. Before entering the drilling site, ask yourself the following questions: A drilling site is equipped with various safety features, including
  9 KB (1,411 words) - 15:10, 24 January 2022
• FWhitehurst sandbox
  * blowout Wikipedia:Blowout (well drilling) * bridge (drilling) http://www.glossary.oilfield.slb.com/en/Terms/b/bridge.aspx
  22 KB (3,024 words) - 21:42, 19 December 2014
• 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
• Pinedale field
  ...helped to release the gas trapped in the Lance Pool. Finally, high-density drilling, as dense as one well for five acres, has allowed for significantly improve ...ars) for wells drilled by QEP in Pinedale field. With improved drill bits, mud systems, and crew efficiency, drill times decreased by more than 80% betwee
  16 KB (2,521 words) - 17:13, 29 January 2016
• Types of wells
  ...in the efforts to drain a specific configuration of hydrocarbons. Various drilling strategies can be adopted to place wells in specific patterns with the aim ...g the planned direction for the well.<ref>Inglis, T. A., 1987, Directional drilling: London, Graham amp Trotman, 260 p.</ref>
  22 KB (3,567 words) - 17:20, 11 March 2019
• 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
• Overview of routine core analysis
  ...e different from that under reservoir conditions. These changes are due to drilling processes, gas expansion, and handling errors.<ref name=pt05r22>Bass, D. M. ...when large solution voids are present or when the core is badly invaded by mud solids.
  14 KB (2,121 words) - 21:16, 19 January 2022
• Fishing
  ...gue, H₂S embrittlement, differential sticking, and overstressed drilling assembly, causing a twist-off. ...ude a catching tool, bumper jar, oil jar, drill collars, and drill string. Drilling jars (specially strengthened jars) are commonly run in the drill string in
  8 KB (1,156 words) - 21:19, 19 January 2022
• Haynesville and Bossier Shales (Upper Jurassic), East Texas and Northwest Louisiana
  ...Reservoir depth ranges from 9,000 to 14,000 ft (3000–4700 m), and lateral drilling distances range between 4,600-10,000’ using slick water fluid, 30000-4000 ...ion, as well as huge development inventory from existing locations and pad drilling (Figs. 2, 3). One of the advantages of the Haynesville shale gas is that it
  4 KB (628 words) - 23:05, 3 March 2022
• Well types
  [[File:PinedaleFieldLandRig.png|thumb|400px|Drilling rig in Pinedale field with the Wind River Mountains, Wyoming, USA in the ba ...the efforts to drain a specific configuration of [[hydrocarbon]]s. Various drilling strategies can be adopted to place wells in specific patterns with the aim
  24 KB (3,753 words) - 19:33, 3 March 2016
• Taphonomy and provenance
  * Recognizing contamination by drilling mud or [[caving]]s
  3 KB (449 words) - 18:12, 31 January 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
• 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
• Core handling
  ...probably the most important and visible feature in wellsite core handling. Mud should be wiped off the core or inner barrel to get a good marking surface. * [[Drilling problems]]
  7 KB (1,083 words) - 20:50, 19 January 2022
• Stratigraphically complex fields
  ...ociated with a stratigraphically complex field include difficulties in (1) drilling and completion and (2) reservoir characterization and management. ===Drilling and completion problems===
  8 KB (983 words) - 20:49, 19 January 2022
• Well completion
  ...s in Appalachia. In a typical open hole completion, casing is set prior to drilling into the producing interval. A nondamaging fluid can then be used to drill ...e of an openhole completion is that production casing must be set prior to drilling and logging the reservoir. If for some geological or engineering reason the
  19 KB (2,910 words) - 21:06, 18 January 2022
• Vitrinite reflectance
  * Drilling mud additives ...rinite reflectance data due to contamination by caving. As a result of the drilling process, immature [[kerogen]] caved into the bore-hole and mixed with drill
  7 KB (970 words) - 14:28, 10 February 2022
• Production testing
  ...roleum Engineers of AIME, 159 p.</ref> A DST is run in the open hole after drilling, and is often used in deciding whether to complete a particular zone. The t ...w valves, and one or two packers. The tool isolates the formation from the mud column in the annulus. When the tool is opened, reservoir fluid can flow in
  14 KB (2,165 words) - 18:42, 20 January 2022
• Critical elements application: Niobrara example
  * Drilling must be conducted with [[Analysis of mud weights|underbalanced mud]] or air to prevent fracture damage. The Niobrara is an [[Causes of underpr
  7 KB (962 words) - 16:03, 18 February 2022
• Oil and condensate analysis
  | Drilling additive or contaminant or formation fluid ...al properties. In addition, samples of drilling mud, load and kill fluids, drilling additives, and wellsite fuel oils and lubricants should be kept until petro
  14 KB (2,013 words) - 16:48, 20 January 2022
• Core alteration and preservation
  During core acquisition and retrieval, the mud filtrate often invades the core. Invasion can displace over half of the nat ...y, pressure differential and relative permeability of the formation to the mud filtrate, and core diameter.<ref name=Basan_etal_1988 />
  20 KB (2,971 words) - 15:46, 19 January 2022
• Drill stem testing
  ...xcessive damage by [[drilling fluid]]s and should be used in designing the mud program. The anticipated reservoir properties are used to design the test s The best time to run a DST is just after drilling through a potential pay zone, when exposure to damaging fluids is minimal a
  26 KB (4,009 words) - 15:09, 24 January 2022

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