Equivalent Circulating Density (ECD) Using Yield Point for MW More than 13 ppg

Another equation to determine equivalent circulating density is to use yield point.

This formula below is used to calculate the ECD and it is good for mud weight more than to 13.0 ppg


ECD is equivalent circulating density in ppg.

MW is mud weight in ppg.

Hold ID is inside diameter of hole in inch.

Pipe OD is outside diameter of pipe in inch.

YP is mud yield point.

YP can be calculated by these following equations.

YP = Reading at 300 rpm – PV

PV = Reading at 600 rpm – Reading at 300 rpm

AV is annular velocity in ft/min

AV can be determined by the following equation.

AV in ft/min = (24.5 x Q) ÷ (Dh2 – Dp2)


Q = flow rate in gpm

Dh = inside diameter of casing or hole size in inch

Dp = outside diameter of drill pipe, drill collars, or tubing in inch

Determine the ECD with the following information

MW = 13.5 ppg

Reading at 300 = 25

Reading at 600 = 40

Hole diameter = 6.2

Pipe diameter = 4

Flow rate = 200 gpm


AV in ft/min = (24.5 x 200) ÷ (6.22 – 42) = 218.4 ft/min

PV = 40 – 25 = 15

YP = 25- 15 = 10

ECD = 14.2 ppg

If you have mud weight less than 13 ppg, please read this article ” Equivalent Circulating Density (ECD) Using Yield Point for MW less than 13 ppg 

Additional articles about Equivalent Circulating Density (ECD) are as follows:

Equivalent Circulating Density (ECD) in ppg

Equivalent Circulation Density (ECD) with complex engineering equations

Effect of Frictional Pressure on ECD while reverse circulation

Effect of Frictional Pressure on ECD while forward circulation

Ref book: Drilling Formula Book Formulas and Calculations for Drilling, Production and Workover, Second Edition

Related Post

Drill Pipe Pressure Schedule Calculation for Wait ... This example demonstrates how to determine drill pipe pressure schedule for wait and weight method.   Well Information Current mud weigh...
Estimate Type of Influx (kick) From the previous topic, estimate Height of Influx, you can use influx height to estimate type of influx. The following equation is used for estima...
How much pressure will we see at cement head in ca... I still have the simple but interesting question about hydrostatic pressure which you can apply this calculation into drilling/cementing operation. Th...
Hydrostatic Pressure Calculation Hydrostatic pressure is created by fluid column. Two factors affecting hydrostatic pressure are mud weight and True Vertical Depth. In this article, i...
Share the joy
  • 11
  • 7

About DrillingFormulas.Com

Working in the oil field and loving to share knowledge.
Tagged , , . Bookmark the permalink.

8 Responses to Equivalent Circulating Density (ECD) Using Yield Point for MW More than 13 ppg

  1. Mouhanad Habbal says:

    May I ask , Do you use formulas in the field ??

  2. tulio says:

    I think this formula can’t be used in the field because you may have several pipe sections like DC, HW, 5″ DP , 4″ DP , 3.5″ DP and so on , so the ECD will be different around every pipe section.
    I think the best formula for ECD to use is that one based on annular pressure loss.

  3. kresimer zubac says:

    I think this formula is not accurate

  4. khalil says:

    This formula does not include pipe length and well depth.

Leave a Reply

Your email address will not be published. Required fields are marked *