Rock matrix and fracture analysis of flow in western tight gas sands

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The presence of natural fractures is often cited as a key factor in gas production for both fractured and unfractured wells. Numerous vertical fractures have been found in cores recovered in the Multi-Well Project. The cores show that by far the majority of fractures become filled with calcite cement. However, calcite-filled fractures are not necessarily a seal to gas flow. As part of this project, flow measurements are being made along and across selected fractured samples as a function of overburden pressure for a minimum of five core samples. Comparative measurements will be made on unfractured neighboring cores. Permeability measurements ... continued below

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Pages: (27 p)

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Morrow, N.R.; Brower, K.R.; Kilmer, N.H. & Ward, J.S. January 1, 1984.

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Description

The presence of natural fractures is often cited as a key factor in gas production for both fractured and unfractured wells. Numerous vertical fractures have been found in cores recovered in the Multi-Well Project. The cores show that by far the majority of fractures become filled with calcite cement. However, calcite-filled fractures are not necessarily a seal to gas flow. As part of this project, flow measurements are being made along and across selected fractured samples as a function of overburden pressure for a minimum of five core samples. Comparative measurements will be made on unfractured neighboring cores. Permeability measurements will be made at a minimum of four levels of water saturation for each of at least six samples to assess the effect of water content on permeabilities in fractured systems. The effects of chemical treatments on mineralized fractures will be studied to assess whether such treatments lead to permeability enhancement of formation damage. Permeability to gas will be measured at various levels of water saturation established by equilibration of core samples in humidity chambers. Electrical resistivity at various levels of water saturations and confining pressures will also be measured. Special attention will be given to water distribution within the rock pore space. circumstances under which water can act to inhibit gas production and the pressure differences necessary to overcome capillary seals formed by water will also be investigated. Capillary pressure measurements will be made using a high-speed centrifuge.

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Pages: (27 p)

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OSTI; NTIS; GPO Dep.

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  • Other: DE92017656
  • Report No.: DOE/MC/21179-T6
  • Report No.: PRRC--83-14
  • Grant Number: AC21-84MC21179
  • DOI: 10.2172/5119519 | External Link
  • Office of Scientific & Technical Information Report Number: 5119519
  • Archival Resource Key: ark:/67531/metadc1054582

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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Creation Date

  • January 1, 1984

Added to The UNT Digital Library

  • Jan. 22, 2018, 7:23 a.m.

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  • Jan. 29, 2018, 1:51 p.m.

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Morrow, N.R.; Brower, K.R.; Kilmer, N.H. & Ward, J.S. Rock matrix and fracture analysis of flow in western tight gas sands, report, January 1, 1984; United States. (digital.library.unt.edu/ark:/67531/metadc1054582/: accessed August 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.