Horizontal Subsea Trees for the Shasta Development:An Operators Perspective

David Lorimer

Research output: Chapter in Book/Report/Conference proceedingPublished conference contribution


The Shasta project was managed by Hardy Oil and Gas and the operation handed over to Texaco after first production in November 1995. Weekly team meetings were held from May 199-t to October 1995. These meetings covered the Engineering and Construction phases of the project. Hardy created a unique project team environment which provided an open forum for group discussion. The Shasta subsea team consisted of a Hardy team leader, a Texaco engineer, a Texaco production supervisor and representatives from contractors and manufacturers. Team members were chosen on a partnering basis and not via a formal bidding process. It was decided that a Horizontal tree system should be used for the project (reference Figure 1). This paper describes why and how this decision was made, how the system was put together and how it has worked to date, The Shasta tree is an cmbodiment of team contributions to improvements in the following areas;
Controls interface
Ease of installation
Ease of intervention
Environmental protection
Seal design
Wireline plug design
Systcrn integration
Original languageEnglish
Title of host publicationOffshore Technology Conference
ISBN (Electronic)978-1-61399-092-6
Publication statusPublished - 6 May 1996
EventOffshore Technology Conference : 1996 - Houston, Texas , Houston, Texas , United States
Duration: 6 May 19969 May 1996


ConferenceOffshore Technology Conference
Country/TerritoryUnited States
CityHouston, Texas


  • interface
  • procedure
  • drillstem/well testing
  • rig
  • horizontal tree system
  • drillstem testing
  • upstream oil & gas
  • horizontal tree
  • plug
  • completion equipment


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