Evaluation of in situ hydraulic properties of formations at great depth

Kazuo Hayashi, T. Ito, H. Abe

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

The pressure decay process during the so-called pressure pulse test is analyzed for evaluating in situ hydraulic properties of a formation at great depth. The analysis takes the following factors into account, i.e., the compliance of the tubular connecting the straddle packer to the pump on the surface and anisotropy of a formation. An automatic and objective method is developed for the evaluation, instead of the manual type-curve-fitting process which has been used in the conventional method. The new method utilizes a two-dimensional optimization, where the objective function is defined as a weighted residual sum of squares of the deviation between an experimentally observed pressure decay and a reference curve of the pressure decay, i.e., a type curve, which is theoretically prepared in advance for a given set of hydraulic properties. The method was applied to pressure decay data of pressure pulse tests performed in a field test. -from Authors

Original languageEnglish
Pages (from-to)145-157
Number of pages13
JournalGeothermal Science & Technology
Volume4
Issue number3
Publication statusPublished - 1995 Dec 1

ASJC Scopus subject areas

  • Water Science and Technology
  • Ocean Engineering
  • Management of Technology and Innovation

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