--> Abstract: Monitoring Lithology Variations in Complex Exploration Area by the SWD Technology SEISBIT, by F. Poletto, F. Miranda, P. Corubolo, and F. Abramo; #90942 (1997).
[First Hit]

Datapages, Inc.Print this page

Abstract: Previous HitMonitoringNext Hit lithology variations in complex Previous HitexplorationNext Hit area by the SWD technology SEISBIT

POLETTO F., F. MIRANDA, P. CORUBOLO , F. ABRAMO

During the drilling of an Previous HitexplorationNext Hit well in a prospect where the lithologic sequence is not well known, the geology is structurally complex, and the Previous HitseismicNext Hit response is extremely poor, perforation can present some difficulties in the planning of the casing sequence and in the bit type to be used.

A Previous HitseismicNext Hit tool, the Vertical Previous HitSeismicNext Hit Profiles (VSP), is useful to recognize the Previous HitseismicNext Hit events in a well and below the TD of the well. In conventional VSP the drilling must be interrupted to convey a geophone down-hole, this implies drilling stand-by time besides operative risks. A solution to these problems is recording passive reciprocal VSPs using the drill-bit as an energy source. For this reason AGIP and OGS designed and built the SEISBIT system, capable of acquiring and pre-processing data directly on the field. These data are processed as standard VSPs. An advantage of SWD tools, compared to the other sources of data, is the capability of prediction "ahead of the bit"; moreover the Previous HitseismicNext Hit velocities obtained by SWD recording system can be used to convert the interpreted Previous HitseismicNext Hit sections in depth and to produce updated maps during the perforation. Other information may be derived also Previous HitfromNext Hit logging while drilling measurement (LWD) and integrated with SWD can be used to improve the WD interpretation in area with poor Previous HitseismicTop response.

This paper presents the results of several case histories where the SWD methodology has been used to monitor the lithologic sequence and helped to solve operative problems.

AAPG Search and Discovery Article #90942©1997 AAPG International Conference and Exhibition, Vienna, Austria