is the pinnacle of drilling engineering technology
and is the technique used to drill significant
lateral distances from a rigsite.
As reserves become even smaller and difficult to access, this becomes an ever-more important enabling technique to exploit hydrocarbons which otherwise would be uneconomic to produce. Our on site improvements reduce drilling and completion costs, improve production rates and minimize environmental impact.
ERD wells are an efficient, elegant and environmentally favourable solution to producing hydrocarbons.
The standard definition can be unsatisfactory as wells with true vertical depths may fall outside the definition despite carrying ERD challenges. The objective is to set a definition to allow changes in risk to be considered.
WHAT IS ERD?
Wikipedia explanation: “A form of directional drilling”
The standard definition uses the ratio between surface and bottom hole locations : stepout (horizontal departure) greater than twice vertical depth. High angle is an inclination greater than 30 degrees.
Extended reach drilling is carried out on long, high angle wells, when the position of the surface location and targets do not allow a short throw, low angle to be drilled.
- Hole cleaning and hydraulics
- ECD management
- Wellbore stability
- Torque and drag
- Stuck pipe avoidance
- Equipment selection
- Increased reserve potential
- Fewer surface locations
- Maximised reservoir contact
- Deferred abandonment
- Reduced environmental impact
- Potential cost savings
The principle of ERD is simple, however designing a well that minimizes the risk of a major NPT event is not – the industry is littered with avoidable drilling problems where it was thought that just another 10 degree inclination or an extra 500m of tangent section would not be a problem!