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• Depth and thickness conversion
  ''Measured depth'' (MD), or ''drilled to depth'' (DD), is the depth measured (by driller or logger :<math>\mbox{TVD} = \sum (\mbox{MD}_{i} - \mbox{MD}_{i-1}) \times \cos \alpha_{i}</math>
  17 KB (2,363 words) - 16:49, 20 January 2022
• Total measured length
  ...surface datum to the toe. In general, it is referred to as measured depth (MD) and is determined ty the sum of lengths of individual joints of drill pipe
  1 KB (186 words) - 19:53, 3 March 2016
• Midale porosity, pore geometries, and petrophysics
  ...eometries. Permeabilities in rock with only 10% porosity are as high as 10 md. ...le localized lenses of porous mudstone have as much as 30% porosity and 20 md permeability, these probably are laterally isolated from each other.
  5 KB (659 words) - 16:54, 12 April 2022
• Sandstone permeability estimation from cuttings
  ...I Subclasses''<br>IA:>100md<br>IB: 10–100 md<br>IC: 1–10 md<br>ID: ±0.5–1 md ...robe can only occasionally dislodge a grain from rock surface || ± 0.5–1.0 md (depending on particle size, sorting, and clay mineral content)
  6 KB (882 words) - 17:19, 6 April 2022
• Sandstone permeability prediction from texture
  * At >10 millidarcies (md), the [[reservoir]] can produce oil without [[stimulation]]. * At >1 md, the reservoir can produce gas without stimulation.
  9 KB (1,118 words) - 17:03, 6 April 2022
• What is permeability?
  * K_a = permeability to air, md ...s-sectional area A of the plug, yields a K_a of approximately 20 md.
  5 KB (694 words) - 20:41, 4 April 2022
• Reef
  ....S. Virgin Islands. NOAA Technical Memorandum NOS NCCOS 96. Silver Spring, MD. 53 pp.</ref>
  2 KB (298 words) - 21:30, 21 November 2014
• Relative permeability
  ...e reservoir system rock has a [[porosity]] of 30% and a permeability of 10 md ([[Characterizing_rock_quality#What_is_r35.3F|r₃₅]] = 1.1μ). La ...20%, S_o ≈ 80%), relative permeability is approaching 1.0 (~ 10 md).
  9 KB (1,351 words) - 13:31, 5 April 2022
• Rock quality
  ...olitic [[limestone]]. Its average Φ is 10% and average K_a is 10 md. * K_a = air permeability, md
  10 KB (1,534 words) - 16:53, 4 April 2022
• Strain analysis of top seals
  ...ured top seal with a relatively low fracture [[permeability]] of only 0.05 md, is more than 100 billion bbl/m.y.<ref name=ch10r71 /> Fracture permeabilit
  3 KB (403 words) - 15:21, 30 March 2022
• Basin-centered gas systems
  ! Type || Source rocks || Reservoir in-situ permeability (md) || [[Hydrocarbon migration]] distance || Reservoir pressure || Pressure me
  4 KB (469 words) - 19:01, 14 March 2016
• Vibro-sesismic to increasing the production rate of coal bed methane
  ...53.9% with average 36.6%. Kabs data before vibration is 231.46 m – 1113.59 mD and after vibration can reach 54.1% with average 39.4%. Sor Data before vib ! rowspan = 2 | || colspan = 4 | k (md) || colspan = 3 | Amplitude (mv)
  11 KB (1,551 words) - 16:49, 11 January 2016
• Marcellus Shale (Devonian) -- Appalachian Basin
  ...011), and exists at drilling depths of 2,000 to 9,000 feet measured depth (MD) (Zagorski and others, 2012; Wang and Carr, 2013). The organic-rich Marcell ...of the Marcellus Shale in western Maryland is zero to more than 8,000 feet MD (Brezinski, 2010, 2011). There is currently (2020) no production from the M
  19 KB (2,773 words) - 21:36, 4 March 2022
• Stimulation
  ...oir stimulation methods, while those having effective permeabilities of 10 md or greater generally require damage removal methods. Those formations in be ...permeabilities often in the microdarcy range (1 μD, or microdarcy, = 0.001 mD). If economic completions are to be developed from such formations, hydraul
  24 KB (3,633 words) - 13:55, 24 January 2022
• Tight gas reservoirs: evaluation
  Gas reservoirs with estimated ''in situ'' gas permeabilities of 0.1 md (millidarcy) or less are officially recognized by the U.S. Federal Energy R ...and expected. While the average air permeability values rarely exceed 1.0 md (millidarcy) for tight gas reservoirs, a significant difference in permeabi
  11 KB (1,444 words) - 21:26, 4 January 2024
• Coal bed methane (UDip)
  ...ter) and gas. Permeability values obtained from the test is equal to 40.43 mD. Permeability value shows that a flow of 40.43 milli cc, fluid (gas), moves ...be seen from the value of 24.8% porosity and permeability values of 40.43 mD. A small value of permeability indicates that it comes from the secondary p
  10 KB (1,576 words) - 14:42, 2 April 2019
• Stratigraphic trap seals
  ...ia:Mesoporous material|mesoporous]] sandstone with 18% [[porosity]] and 10 md [[permeability]], then the bottom [[length::75 ft]] (20 m) of the trap will
  5 KB (632 words) - 20:26, 3 February 2022
• Weyburn seal capacity
  * Ka = air permeability, md ...oductive area have porosities of about 10% and permeabilities of about 0.1 md (or less), based on routine core analyses from the 1960s. Unfortunately, th
  10 KB (1,484 words) - 20:55, 4 December 2023
• Reservoir
  ...ressure of 10-4atm m-2. Permeability in reservoir rocks may range from 0.1 mD to more than 10 D.<ref name=gluyas2004 /> ...remely high because of the dissolution, but permeability is not far from 5 mD. It is called clastic because oolite associated with limestone is present t
  14 KB (2,134 words) - 16:48, 26 March 2019
• Permeability
  ...unit for permeability is the Darcy (d) or, more commonly, the millidarcy (md). Relative permeability is a dimensionless ratio that reflects the capabili ...meability is typically expressed are the ''darcy'' (d) and ''millidarcy'' (md). A permeability of 1 d allows the flow of 1 cm³ per second of f
  19 KB (2,716 words) - 19:02, 20 January 2022

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