Schlumberger

SWINGS Seismic Navigation and Positioning System

Overview Library

Source vessel control for surface seismic applications of the Q-Borehole system

The SWINGS seismic navigation and positioning system is used to accurately deploy equipment for surface seismic applications, particularly in shallow water and transition zone environments. This proprietary technology has been customized to add new functionality for source vessel control within the Q-Borehole integrated borehole seismic system. SWINGS system capabilities include complex 3D vertical seismic profile (VSP) geometries and seismic measurement while drilling.

Portable and robust, the SWINGS system has a history of field-proven accuracy and reliability. The SWINGS system also provides improved quality control (QC) and equipment integration. Safety benefits include telemetric file transfer between the source vessel and the rig to enable the vessel to maintain an appropriate distance from the rig. A dedicated helmsman’s position display provides a continuous presentation of navigation information at all times, which is particularly important for guiding the vessel in adverse sea conditions.

Advanced seismic positioning

The SWINGS system features twin low-noise, 12-channel internal GPS receivers. The receivers output positions at a high update rate of 5 fixes/s and accept Radio Technical Commission for Maritime Services (RTCM) format pseudorange corrections from individual stations, thereby supporting continuous comparison between the two receivers using distinct differential GPS reference stations. Submeter GPS accuracy provides source position determination within 3 to 5 m.

Rigside QC and telemetry

The ultrahigh frequency (UHF) telemetry link of the SWINGS system continually relays source position, fix quality, and other data to the rigside logging unit for graphic display on a laptop PC. The source position is passed to the acquisition and imaging system at every shot for immediate recording with the seismic trace headers. Immediate data recording eliminates any delays in merging position and seismic data. While offline, the telemetry link can be used for file transfer between the rig and source vessel.

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Quality Walkabove VSP Survey Meets Reservoir Geophysics Objectives

VSP Image Below Well Inserted on Surface Seismic Image.
Wireline tractor conveys seismic imagers to record a walkabove VSP survey that accounts for the geometry of a deviated deepwater well.
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Accurate Deployment for Vertical-Incidence VSPs

A vertical incidence VSP operational setup.Real-time Swings display shows shot positions relative to circle of tolerance.Corresponding Swings postplot highlights shot fired outside circle of tolerance.
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