Jack-Up Preloading Procedure

Purpose

• To understand the principles and procedures for different types of preloading.
• To gain expertise in preloading calculations and analysis for various conditions.
• To develop skills to evaluate sea bed data and tide impacts on preloading operations.
• To recognize and mitigate risks associated with punch through / rapid penetration.

Target Audience

Barge Masters / Engineers / Supervisors / Marine Planner , Rig Operators, and other offshore personnel involved in jack-up rig operations.

Course Content

Section 1: Types of Preloading

• Overview of Preloading Techniques: Introduction to the purpose and process of preloading.
• Independent Leg Preloading: Characteristics, benefits, and operational considerations.
• Preloading in Airgap and 0′ Air Gap: Detailed comparison of operations in airgap conditions versus 0’ air gap and submerged preloading.
• Preloading in Water: Challenges and best practices for preloading under water conditions.
• Four vs. Three-Legged Rig Preloading: Differences in preloading dynamics and procedures between four-legged and three-legged rigs.

Section 2: Preloading Calculations and Analysis

• Preloading Calculations for Each Condition: Step-by-step guide for conducting accurate preloading calculations under different scenarios.
• Leg Penetration Analysis (LPA): Techniques for analyzing leg penetration depth and maintaining operational stability.
• Footing Penetration Analysis (FPA): Understanding the footing penetration process and ensuring safe engagement with the seabed.

Section 3: Importance of Tidal Calculations

• Spring and Neap Tide Considerations: How tidal variations influence preloading operations and the safety of the rig.
• Tide Calculation Significance: Accurate methods for calculating tides to avoid complications during preloading.

Section 4: Understanding Sea Bed and Bathymetric Data

• Sea Bed Soil Data: Interpreting different types of seabed soil properties and their implications for preloading.
• Bathymetry Insights: Utilizing bathymetric charts and data for optimal site assessment and rig placement.

Section 5: Emergency Avoidance Strategies

• Preventing Punch Through: Comprehensive risk mitigation steps and monitoring techniques to avoid punch through.
• Handling Rapid Penetration: Action plans and preventive measures for managing rapid penetration during preloading.