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Dipole Shear Imaging behind casing: Extending the Borehole Acoustic Imaging envelope to Brown-fieldsNormal access

Authors: A. Srivastava, H. Yamamoto, S. Ahmed, J. Roberts, F. Cantin, O.-D. Moreau and N. Bounoua
Event name: IPTC 2014: International Petroleum Technology Conference
Session: Session 61: E&P GEOSCIENCE - Geoscience Formation Measurements
Publication date: 19 January 2014
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 793.08Kb )
Price: € 20

Summary:
The potential for imaging bed boundaries and fractures using the borehole acoustic reflection survey (BARS) technique is well documented. Traditionally, this type of imaging has been conducted with a monopole source and imaging the reflected P and the mode-converted transmission waves (Pto S and S to P). Recently the BARS methodology has been applied to shear data from a dipole source. Much of the published work is in an open-hole environment. In our case study a BARS image was acquired in a layered carbonate reservoir in a horizontal well behind casing. The objective was to acquire a base image prior to a planned hydraulic fracturing job for comparison with the post-fracturing image. Both, monopole and dipole data were used to do the imaging. Data acquired shows that the BARS technique overcame uncertainties associated with; arrival of the casing modes, cement conditions, attenuation of the reflected signal at the casing/cement/formation interfaces and provided reliable results behind casing up to a distance of 100 ft away from the well.


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