Description

This curriculum spans the technical and operational rigor of a multi-workshop engineering program, addressing the same casing design, execution, and integrity challenges encountered in complex well construction projects, from high-pressure onshore reservoirs to deepwater developments.

Module 1: Casing Design Fundamentals and Load Analysis

Select appropriate casing grades (e.g., P110 vs. L80) based on anticipated burst, collapse, and axial loads in high-pressure reservoir zones.
Calculate collapse pressure using external mud weight, formation pore pressure, and cement column height under lost-circulation scenarios.
Adjust burst resistance calculations to account for surface pressure testing requirements and potential kick conditions during drilling.
Incorporate thermal effects in deep, high-temperature wells where expansion induces axial stress on casing strings.
Evaluate biaxial stress effects in deviated wells where combined axial and radial loads reduce effective collapse resistance.
Integrate formation fracture gradients into design to prevent cement-induced formation breakdown during displacement.

Module 2: Casing String Selection and Configuration

Determine the number and depth setting points for conductor, surface, intermediate, and production casing strings based on pore pressure and fracture gradient profiles.
Optimize casing and hole sizes to ensure sufficient annular clearance for cement placement while maintaining wellbore stability.
Select liner vs. full string completions considering cost, pressure integrity, and zonal isolation requirements.
Specify centralizer type (rigid vs. bow-spring) and spacing to achieve 70% standoff in critical zones for effective cement bonding.
Design tieback strings for extended-reach wells where top drives limit casing running depth.
Account for casing wear in high-deviation sections by increasing wall thickness or using wear-resistant materials.

Module 3: Cementing Program Development and Execution

Design multi-stage cementing programs for deep wells where single-stage placement risks formation breakdown or channeling.
Specify cement slurry density to balance hydrostatic pressure and avoid lost returns in depleted zones.
Include laboratory testing of cement rheology and thickening time under downhole temperature and pressure conditions.
Implement cement bond log (CBL/VDL) evaluation criteria to validate zonal isolation in critical intervals.
Design spacer fluids to displace drilling mud effectively in narrow annuli or high-angle sections.
Address gas migration risks by selecting expandable or gas-tight cement formulations in high-gas-content formations.

Module 4: Casing Running and Handling Procedures

Develop running speed protocols to minimize surge and swab pressures in narrow pressure window environments.
Implement torque monitoring during makeup to prevent over-torquing of premium connections, particularly in sour service applications.
Use real-time downhole pressure sensors to validate safe casing running practices in depleted reservoirs.
Inspect and document casing for defects (e.g., thread damage, dents) before and during running operations.
Coordinate casing running with rig crew to avoid buckling in high-angle wells using controlled running speeds and centralization.
Apply thread compound compatible with downhole fluids and temperature to prevent galling and corrosion.

Module 5: Pressure Integrity and Testing Protocols

Perform leak-off tests after cementing to validate shoe integrity before drilling ahead.
Conduct casing pressure tests at 110% of expected maximum operating pressure, including temperature effects.
Establish procedures for monitoring sustained casing pressure (SCP) and implementing venting or remedial actions.
Use real-time pressure monitoring during well control events to detect casing leaks or shoe breakdown.
Document test procedures and results for regulatory compliance and well integrity management systems.
Design isolation valves and surface equipment to safely manage high-pressure testing in sour or deepwater environments.

Module 6: Corrosion and Material Degradation Management

Select casing materials (e.g., CRA liners, 13Cr) based on H₂S, CO₂, chloride content, and pH in produced fluids.
Implement corrosion inhibition programs with continuous monitoring via corrosion coupons or electrical resistance probes.
Design casing vent systems to prevent crevice corrosion in annuli with trapped brine or oxygen ingress.
Evaluate galvanic corrosion risks when combining dissimilar metals in casing and completion strings.
Apply internal coating or cladding in production casing exposed to corrosive multiphase flow.
Perform fitness-for-service assessments on aged casing using ultrasonic thickness measurements and remaining life modeling.

Module 7: Regulatory Compliance and Long-Term Well Integrity

Align casing and cementing designs with regional regulatory requirements (e.g., BSEE, NORSOK, OGA).
Document casing design basis and assumptions for audit and well handover to operations.
Integrate casing performance into the well integrity management system (WIMS) with defined inspection intervals.
Design for future plug and abandonment (P&A) by ensuring cement barriers meet regulatory zonal isolation standards.
Implement annular pressure monitoring systems for early detection of casing or cement degradation.
Conduct periodic risk assessments for casing failure considering production changes, water breakthrough, or seismic activity.

Module 8: Advanced Casing Applications and Deepwater Challenges

Design dual-gradient or managed pressure drilling (MPD) casing programs for deepwater wells with narrow pore-fracture margins.
Specify high-collapse resistant casing for deepwater environments with high external hydrostatic loads.
Address seabed settlement effects on conductor and surface casing in ultra-deepwater developments.
Use expandable casing technologies to overcome lost hole sections or maintain hole size in slimhole designs.
Design for thermal cycling in HPHT subsea wells where repeated heating and cooling induce fatigue in connections.
Coordinate casing design with subsea BOP and riser systems to ensure compatibility with well control operations.