Well Control
What this tool does
Circulating density from static mud weight, true vertical depth, and annular pressure loss. This page says what the tool is for, in plain language. The working formula stays on the signed-in tool.
When to use it
Open Equivalent Circulating Density (ECD) when this is the job: Circulating density from static mud weight, true vertical depth, and annular pressure loss. That is usually a hydrostatic or kill-weight check from true vertical depth.
Step-by-step
- Open Equivalent Circulating Density (ECD) from the tool list.
- Fill Unit system, Static Mud Weight, Annular Pressure Loss (Friction), True Vertical Depth (TVD) from the instrument, the drawing, or the job record. Use the unit shown beside each field.
- Run Calculate when that control is on the page, then read every result row and any warning.
- Check the result against the site procedure and the manufacturer data before you change a range, a wire, a setpoint, or a weight.
- This help page is public. Opening the tool still requires a Pro session.
Inputs
- Unit system
- Imperial or metric. Pick one and enter every other field in that system.
- Static Mud Weight
- Static Mud Weight is the value you read from the instrument, the drawing, or the job record. Enter it in ppg.
- Annular Pressure Loss (Friction)
- Annular Pressure Loss (Friction) is the value you read from the instrument, the drawing, or the job record. Enter it in psi.
- True Vertical Depth (TVD)
- Vertical depth, not the measured depth along the wellbore.
Results
- Result
- The reported value for Equivalent Circulating Density (ECD). Use the unit printed on that row.
- Warnings
- A warning means an entry is incomplete or outside what this tool will stand behind. Recheck the inputs and the site procedure.
Common mistakes
- Using measured depth where the tool wants true vertical depth.
- Leaving a required safety margin off, or adding the same margin twice.
- Do not treat a result from Equivalent Circulating Density (ECD) as a substitute for the site procedure or the manufacturer data.
Standards references
These are the standards and public references named on this tool. Clause numbers appear only when the catalog already cites them.
- API RP 59 well-control hydrostatic factor: psi = 0.052 × ppg × TVD(ft). Exact column weight is 12/231.
- Equivalent circulating density: ECD = MW + annular pressure loss / (0.052 × TVD)
- API RP 13D, rheology and hydraulics of oil-well drilling fluids (annular pressure loss is an input here, not a rheology model)
Offline and access
This engine can run offline after the server has cached it for the signed-in account.
A free session can read this help page. The tool card shows the name and the short summary. Opening the tool requires Pro.