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Hydrostatic Pressure in Drilling: Why Mud Weight Controls Everything
How hydrostatic pressure keeps a well under control. Mud weight, TVD, pore pressure, overbalance margins, and what happens when the numbers go wrong.
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.
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.
Mud Weight Blending: The Math Behind Mixing Drilling Fluids
How to calculate mud blending volumes, barite additions, and dilution ratios. Mass balance equations, practical mixing sequences, and common mistakes that waste product.
Drill String Buoyancy: Why Your Pipe Weighs Less Downhole
How drilling fluid buoyancy reduces string weight. Buoyancy factor calculation, hook load planning, weight-on-bit control, and rig capacity verification.
Formation Temperature & Geothermal Gradients: What's It Like Down There?
How temperature increases with depth, regional gradient variations, BHT corrections, and why formation temperature matters for drilling fluids, cement, and geothermal projects.
Related Tools
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.
Annular Velocity Calculator
Calculate annular velocity and flow rate for hole cleaning. Enter hole/pipe diameters and pump rate to get AV in ft/min with cuttings transport analysis.
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.