ABSTRACT

BP's Horn Mountain SPAR is located in Blocks 126 & 127 of the Mississippi Canyon area, Gulf of Mexico. The water depth at this location is about 5500 ft. The SPAR is held in position by a total of nine suction caissons, arranged in three clusters of three caissons each. The paper presents the geotechnical monitoring results of the installation of the nine suction caissons used for anchoring the Horn Mountain SPAR. Experience from this suction caisson installation is believed to provide valuable information for the future suction caisson designs and installations. The geotechnical monitoring of the installation of each of the nine caissons involved monitoring of self-weight penetration (rate and final penetration achieved), suction penetration (under-pressure inside the caisson's top, water flow through the pump, rate of penetration, and soil plug movement), and caisson's verticality and orientation throughout caisson installation. In addition, the suction caisson design results were compared and updated based on the geotechnical monitoring data collected during installation.

INTRODUCTION

BP's Horn Mountain SPAR is located in Blocks 126 & 127 of the Mississippi Canyon area, Gulf of Mexico (Figure 1). It is anchored to the seafloor by a total of nine suction caissons, arranged in three clusters of three caissons each. The locations of the three anchor clusters and suction caissons are shown on Figure 2. This paper documents the geotechnical monitoring of the installation of the nine suction caissons used for anchoring the Horn Mountain SPAR. The geotechnical monitoring of the installation of each of the nine caissons involved monitoring of self-weight penetration (rate and final penetration achieved), suction penetration (under-pressure inside the caisson's top, water flow through the pump, rate of penetration, and soil plug movement), and caisson's verticality and orientation throughout the caisson installation.

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