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The AAPG/Datapages Combined Publications Database

AAPG Bulletin

Abstract


Volume: 69 (1985)

Issue: 4. (April)

First Page: 676

Last Page: 676

Title: Satellite Transmission of Geologic Data from the Ocean Odyssey: ABSTRACT

Author(s): Frank Raffaldi, David Lovenvirth

Article Type: Meeting abstract

Abstract:

Current satellite communications technology makes it possible and practical to transmit geological and other information from remote oil rigs, under adverse environmental conditions. Under such critical conditions, the ability to provide experts, who are at a significant distance from the rig, with the information necessary to understand what is happening and to carry out timely interpretations has an important impact on successful exploration and economic objectives.

The Ocean Odyssey, operated by Shell in Alaskan waters, provides a practical example of the benefits of satellite communications. From locations in the Bering Sea, Shell is transmitting information to its offices in both Anchorage and Houston for review and analysis. Digital information, suitable for detailed processing and analysis by a mainframe computer is also transmitted. Transmissions designed for managerial and specialist review include periodic reports and tabular printouts, as well as selective color plots of key parameters. The latter are being sent at key points in the drilling process and in response to specific office-based requests for information. Examples of useful transmission formats are provided.

A close relationship exists between the status of well-site operations and the manner in which data communications are carried out. Operational schedules are normally keyed to the work schedule on the rig. But as office-based users become accustomed to examining timely information, additional transmissions are requested. With the present satellite communications configuration the operational schedule is also constrained by the availability of the satellite link. Data communications are based upon batch transmission in which digital information, prints, plots,and reports are accumulated according to the operational schedule and then transmitted, via the Inmarsat satellite. Automatic error correction assures that the information arriving at each office is reliable. Automatic data-encryp ion assures that the information is properly secured against unauthorized access.

Extensive planning is necessary to allow for special problems that arise in establishing a satellite communications link from offshore rigs. These range from technical considerations in providing effective satellite coverage over a wide geographical area in which the offshore rigs may range,to equipment placement and operation, to the development of effective training programs for personnel on the rig and in the office. The elements of the plan are discussed, and examples drawn from the Ocean Odyssey are reviewed. Estimates of actual communication-time requirements are provided along with some of the cost and benefit considerations.

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Copyright 1997 American Association of Petroleum Geologists