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Hydraulic and chemical pulse tests in a shut‐in chamber imbedded in an argillaceous formation: Numerical and experimental approaches
Author(s) -
RousseauGueutin P.,
Gonçalvès J.,
Cruchaudet M.,
de Marsily G.,
Violette S.
Publication year - 2010
Publication title -
water resources research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.863
H-Index - 217
eISSN - 1944-7973
pISSN - 0043-1397
DOI - 10.1029/2008wr007371
Subject(s) - oil shale , shut down , osmosis , hydraulic fracturing , geotechnical engineering , petroleum engineering , geology , chemistry , membrane , engineering , nuclear engineering , paleontology , biochemistry
Hydraulic and chemical pulse tests were performed in four shut‐in chambers to obtain hydraulic and chemical parameters of the Callovo‐Oxfordian shale. The osmotic tests, i.e., chemical pulses, were carried out by exchange of the formation water for a different solution either more or less concentrated. Two sets of two osmotic tests were done in March and October 2006. These osmotic tests are superimposed on a purely hydraulic response because of the drilling of the well causing a pressure drop. The pressure records (hydraulic and osmotic responses) were interpreted using a 2‐D model to obtain the hydraulic and chemical parameters. The osmotic efficiency inferred for the Callovo‐Oxfordian shale is on the order of 0.012 for a concentration of 0.43 mol L −1 and 0.12 for a concentration of 0.086 mol L −1 . These results suggest that the Callovo‐Oxfordian shale behaves as a weakly semipermeable membrane and only 0.1–0.15 MPa of the 0.2–0.5 MPa can be explained by these osmotic efficiency values.