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ECD Explained: Equivalent Circulating Density in Drilling Operations
What ECD is, why it matters more than static mud weight, how annular pressure losses push you toward the fracture gradient, and how to manage the operating window.
Annular Velocity & Hole Cleaning: Getting Cuttings Out of the Hole
Why annular velocity determines hole cleaning efficiency. Minimum AV targets, cuttings slip velocity, deviated well challenges, and flow rate optimization.
Lag Time & Bottoms-Up: Tracking What Comes Out of the Hole
How to calculate bottoms-up time and pump strokes. Why lag time matters for mud logging, gas shows, well control, and knowing what is really happening downhole.
Related Tools
Hydrostatic Pressure Calculator
Calculate hydrostatic pressure from mud weight and true vertical depth. Oilfield imperial (ppg/psi) and metric (SG/kPa) units with overbalance analysis and pressure gradient.
Equivalent Circulating Density Calculator
Calculate ECD from mud weight and annular pressure loss. Determine safe operating window between pore pressure and fracture gradient for wellbore stability.
Lag Time & Bottoms-Up Calculator
Calculate bottoms-up lag time and strokes from well geometry and pump data. Track drilling fluid returns for mud logging, gas detection, and wellbore monitoring.