Measurement of instantaneous shut-in pressure in crystalline rock

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A method is defined which was found useful, not only for determining the instantaneous shut-in pressure (ISIP) during fracture creation, but also for determining the pressure inside the fracture, near the exit and entrance wellbores, when a circulation of fluid through a fracture is taking place. The basic assumption of the Muskat method is that, after a short transient period, the shut-in pressure approaches an asymptotic value, Pa, in an exponential fashion, i.e., if Pa is subtracted from P at each time, t, and the result is plotted, ln (P-Pa) vs t will be a straight line. Various values of ... continued below

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Pages: 10

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Aamodt, L. & Kuriyagawa, M. January 1, 1981.

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Description

A method is defined which was found useful, not only for determining the instantaneous shut-in pressure (ISIP) during fracture creation, but also for determining the pressure inside the fracture, near the exit and entrance wellbores, when a circulation of fluid through a fracture is taking place. The basic assumption of the Muskat method is that, after a short transient period, the shut-in pressure approaches an asymptotic value, Pa, in an exponential fashion, i.e., if Pa is subtracted from P at each time, t, and the result is plotted, ln (P-Pa) vs t will be a straight line. Various values of Pa are tried until the best straight line fit is found. Two Muskat analyses are shown. (MHR)

Physical Description

Pages: 10

Notes

NTIS, PC A02/MF A01.

Source

  • Workshop on hydraulic fracturing stress measurements, Monterey, CA, USA, 1 Dec 1981

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  • Other: DE82012137
  • Report No.: LA-UR-82-782
  • Report No.: CONF-811240-1
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 5244288
  • Archival Resource Key: ark:/67531/metadc1064015

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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.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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Creation Date

  • January 1, 1981

Added to The UNT Digital Library

  • Feb. 4, 2018, 10:51 a.m.

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  • May 31, 2018, 12:54 p.m.

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Aamodt, L. & Kuriyagawa, M. Measurement of instantaneous shut-in pressure in crystalline rock, article, January 1, 1981; New Mexico. (digital.library.unt.edu/ark:/67531/metadc1064015/: accessed November 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.