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Through-tubing well seismic; a mast campaign across an offshore producing field, Saudi Arabia-Kuwait partitioned neutral zone

Kaoru Yamaguchi and Bernard G. Frignet
Through-tubing well seismic; a mast campaign across an offshore producing field, Saudi Arabia-Kuwait partitioned neutral zone
GeoArabia (Manama) (December 1996) 1 (4): 571-582

Abstract

A multi-well VSP Through-Tubing campaign was conducted in order to survey 2 neighboring mature fields in the northern Arabian Gulf. Nine key wells were selected by the reservoir engineers and geophysicists from a total of more than 200 wells. The selection criteria included: (1) spatial distribution; (2) previous well data availability; and (3) completion type. At the planning stage it was estimated that 3 days (excluding night work for safety) would be required per well (one day to rig-up the mast, one day to acquire the seismic data and one day to rig-down). Local experience indicated that a single air gun would be an effective seismic source. A slimhole, monocable, single-axis geophone sonde was selected as the downhole seismic tool. The zero-offset VSP configuration, with 80 foot level-spacing from total depth to surface was adopted. A supply boat was dedicated for the duration of the campaign. The actual operation was completed in 24 days, 3 days earlier than planned. An average of 90% of the VSP levels were found suitable for first break detection, which provided accurate Time-Depth curves for all 9 wells. Geophone coupling quality is dependent on the Tubing-Casing contact. The tube wave is developed at all 9 wells; but, overall 80% of the levels were selected for VSP processing. In 5 wells, where sonic logs had been acquired, synthetic seismograms were generated which confirmed the validity of VSP reflections. The data is now integrated in a 3-D velocity model.


ISSN: 1025-6059
Serial Title: GeoArabia (Manama)
Serial Volume: 1
Serial Issue: 4
Title: Through-tubing well seismic; a mast campaign across an offshore producing field, Saudi Arabia-Kuwait partitioned neutral zone
Affiliation: Arabian Oil Company, Dhahran, Saudi Arabia
Pages: 571-582
Published: 199612
Text Language: English
Publisher: Gulf Petrolink in Bahrain, Manama, Bahrain
Accession Number: 1998-060018
Categories: Economic geology, geology of energy sourcesApplied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table, sketch map
N19°00'00" - N20°00'00", E48°00'00" - E49°30'00"
Secondary Affiliation: Schlumberger Middle East, SAU, Saudi Arabia
Country of Publication: Bahrain
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute.
Update Code: 199822
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