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The Potential of Single-well Acoustic Imaging for Detecting the Direction and Distance to a Target BoreholeNormal access

Authors: M. A. Jervis, A. V. Bakulin, T. L. Tonellot, I. A. Ghamdi, A. Shabbir and H. Yamamoto
Event name: 74th EAGE Conference and Exhibition incorporating EUROPEC 2012
Session: Well Bore Data Acquisition & Analysis
Publication date: 04 June 2012
DOI: 10.3997/2214-4609.20148264
Organisations: SPE, EAGE
Language: English
Info: Extended abstract, PDF ( 1.53Mb )
Price: € 20

Summary:
A new method to locate nearby boreholes using acoustic imaging is presented. The challenge of locating a nearby well from a borehole is commonly addressed with electromagnetic (EM) or passive magnetic ranging methods, which can suffer from poor resolution and penetration and require the presence of a conductive or magnetic casing. Single-well acoustic imaging has great potential for locating a nearby borehole at higher resolution and with fewer of the limitations of EM-based methods. Acoustic imaging requires only an impedance contrast between the target object and the formation, which is adequately provided by the presence of a fluid-filled borehole. Two tests are shown demonstrating the capabilities of the new method. In the first test, a vertical borehole is located and imaged from a nearby horizontal well, and in the second test, a vertical borehole is imaged from a nearby near-vertical well. In both cases the estimated distances were validated by independent measurements.


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