Drillstring Design & Hydraulics
Objectives:
To provide a solid ground in drillstring selection and design and diagnosis of failures. To provide engineer with solid grounding in well hydraulics.
Content:
- Drillstring and BHA
- Functions of drill pipe, drillcollars, grades of drill pipe and strength properties
- thread types
- tool joints
- calculations of approximate weight of drill pipe and tool joint
- drill collar weight and neutral point
- bending strength ratio
- margin of over-pull
- drill string design methods: API method
- slip crushing
- pressure-area method
- stuck point calculations for drill string weight, jar placement
- drill string design for directional and horizontal wells
- DST considerations, torque and drag calculations
- types of subs
- jars
- shock subs
- reamers and stabilizers
- drillstring washouts and fatigue mechanisms: field examples
- drill string failure identification, inspection methods, etc.
- Fluid flow in wellbores
- Laminar and turbulent flow
- Bingham Plastic and Power Law calculations
- Hydraulics calculations
- ECD calculation
- Pumps and liner selection
- Hole cleaning
