Introduction
Introduction to the HPHT environment, its history and how HPHT is currently defined. The geological aspects of the HPHT environment with a detailed look at the well behavior and the material aspects when dealing with elevated pressures and temperatures.
• Welcome and introductions.
• Defining the HPHT environment.
• History of HPHT drilling operations.
• Geological & geophysical aspects of high pressures and temperatures.
• Design challenges with HPHT Wells
• Behavior of gasses at elevated pressures and temperatures
• Behavior of liquids at elevated pressures and temperatures
• Behavior of metals at elevated pressures and temperatures
• Behavior of elastomers at elevated pressures and temperatures
• Exercises; Gas behaviour calculations, Density Calculations
Well Design
Well design standards and well design for HPHT wells.
• Applicable well design, drilling standards, procedures, and guidelines.
• Creating a Basis of Well Design
• Formation pressures and pressure ramps
• Well trajectories
• Casing design aspects for high temperatures
• Well design aspects and their impact on well control
• Wellheads and wellhead growth
• Primary Cementing / Remedial Cementing
• Drilling Fluids (Oil Based / Water Based / Formate Brines)
• Drillstring Design
• Data Collection (LWD / MWD Tools / Drilling Data)
• Well Integrity
- Well integrity standards.
- Integrity specifications for HPHT
- Barriers and Barrier Elements
- Leaks
- Corrosion
- Annular Pressure
- Integrity Failures
- Failure analysis and FMECA
• Contingency Planning
• Exercises: Tubular expansion, Drillstring design, Fluid challenges.
Rig Equipment
Rig requirements for HPHT operations. A detailed review of the surface equipment requirements to drill an HPHT well. This also includes some common recommendations for the use of Managed Pressure Drilling Equipment.
• BOP specifications, configurations, and test requirements
• HPHT rig choke and standpipe manifolds,
• Mud Gas Separator sizing
• Temperature safety aspects
• Mud coolers
• Drilling fluid System
• Bulk Systems (Barite – Cement – Bentonite)
• Barite mixing requirements
• Solids Control
• Managed Pressure Drilling Equipment
- MPD Flow paths
- RCD
- MPD Choke Manifolds
- Flow Meters
- MPD gas handling
- MPD Control Systems
• Exercises; MGS Sizing, Mud weight increases and decreases, Mud Coolers.
Well Operations
Operational aspects of drilling an HPHT well
• The HPHT Section of the well
• Drilling hydraulics and ECD
• Fluid compressibility & density
• Barite Sag
• Pit Discipline
• Fingerprinting
• Gas Solubility
• Well control differences and challenges with HPHT wells
• Ballooning, wellbore breathing and super charging
• Temperature Monitoring
• Drilling and Tripping Operations
• Data Collection and MWD/LWD
• Casing and Cementing Operations
• Managed Pressure Drilling
• Exercises; well control, Barite requirements, barite sag, Gas solubility
Well Evaluation and Completions
Well evaluation aspects from mud logging through well testing. Introduction to completion operations and well clean up.
• HPHT Well Evaluation Logging and coring operations
- Mud Logging
- Wireline logging
- MWD – LWD Tools
- Coring operations
- Well Testing
• Tubing and Wellhead material selection
• Wellhead growth and the seals
• Tubing Movement
• HPHT completions
• Well Control during well testing
• Flow Control Equipment
• Sand Production
• Erosion
• Reservoir Depletion
• Workovers
• Exercises; Material Selection, Reservoir Depletion, Workovers.
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