I created summary page for drilling formulas and calculations (http://www.drillingformulas.com/drilling-formulas-and-calculation-sheets/). I wish these excel sheets would be helpful for you.

Amount of cuttings produced per foot of hole drilled

Annular Pressure Loss

Annular-Capacity

Annular-velocity

Bulk Density Calculation

Buoyancy Factor Oilfield

Convert Pressure to Equivalent Mud Weight

Convert-Specific-Gravity

Cost Per Foot Calculation

Critical RPM

D Exponent Calculation

D Exponent Corrected Calculation

Decrease Oil Water Ratio

Density of Oil Water Mixture

Depth of Washout

Dilution LGS control

Dilution LGS control – adding mud

Directional Survey Calculation – Angle Averaging Method

Directional Survey Calculation – Radius of Curvature Method

Dogleg Severity Calculation – Radius of Curvature Method

Dogleg Severity Calculation – Tangential Method

Drilling or Connection Ton-Mile

Drill-pipe-pulled-to-lose-certain-hydrostatic-pressure

Equivalent Circulating Density Calculation

Equivalent Circulating Density with engineering formula

Formation Integrity Test

Formation Temperature

Free Point Constant Calculation

Hydraulic Horse Power

Hydrostatic Pressure Calculation

Hydrostatic Pressure Decreases When POOH

Increase mud weight adding Barite

Increase mud weight adding calcium carbonate

Increase mud weight adding hematite

Increase Oil Water Ratio

Internal Capacity

Lag Time Calculation

Leak off test calculation

Light Weight Spot Pill

Loss hydrostatic due to filling water into annulus

Mix Different Fluid Density – Limit Space

Mix Different Fluid Density – Unlimit Space

Mud Volume Increase Due to Adding Barite

Mud Volume Increase Due to Adding Calcium Carbonate

Mud Volume Increase Due to Adding Hematite

Oil Water Ratio from a Retort Analysis

Pipe Displacement Calculation

Pressure and Force Calculation

Pressure Gradient Calculation

Pressure Required to Break Circulation In Annulus

Pressure Required to Break Circulation Inside Drill String

Pump Output (Duplex and Triplex)

Pump Pressure and Pump Stroke Relationship

Reduce Mud Weight by Dilution

Slug Calculation – Barrel of Slug Required

Slug Calculation – barrels of slug required for a desired length of dry pipe

Slug Calculation – Weight of Slug Required

Specific Gravity Calculation

Starting Volume for Weighting Up with Bartie

Starting Volume for Weighting Up with calcium carbonate

Starting Volume for Weighting Up with Hematite

Stuck Pipe Calculation – Not Know Free Point Constant

Stuck Pipe Calculation – Use Table for Free Point Constant

Temperature Conversion Formulas

Ton-Mile (TM) for Coring Operation

Ton-Mile (TM) for Making Short Trip

Ton-Mile (TM) for Round Trip

Ton-Mile (TM) for Setting Casing

Ton-Mile (TM) for Drilling or Connection

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

Great work.

Thanks.

my comment about the site

its the strongest site I have read

thank you very much

marvellous job done. thanq very-very much

If you run in with a ported float in the string, how would you calculated the displacement. Also if while running in with the float and you noticed that the displacement is completely closed end, what could be your best option to calculate displacement. Note, you are allowed to fill the pipe but not allowed to pump due to perceived low overbalance pressure. How best can you calculate you displacement in these scenarios.

The best way to calculate displacement with float in the drillsting (ported float or solid float) is to use only OD of drill pipe to calculate displacement because mud cannot come inside the drillstring.

The formula for the displacement will be => displacement = (OD^2)/1029.4 in bbl/ft.

Once you fill up pipe, you should use the original formula to check the displacemen.

Indeed, great job, am greatful for all your effeorts so far. More grease to you elbow.

This calculation and concepts seems to buield some good knowledge for people in drill site.

Thanks

excllency sir,i found this very helpful during drilling activities.i suggest people to use feedburner so as to enhance your expertise and skill.thanks FEEDBURNER

Its really more helpful during drilling.

If study this will improve our knowledge more……….

Really fantastic website..

it is a very good handout and very helpfull for the on site supervisors , thank you very much for that great effort

THE SITE IS A GREAT SITE TAKING CARE BY HIS PEOPLE

Do you have a calculation for negative test?

I don’t have it but you can calculate the negative test using the difference of hydrostatic pressure from the fluid in the wellbore.

Please assist with this question, I’m not sure I understand the question

While drilling ahead at 14,300’ lost circulation was encountered. The hole size is 12 ¼”. The BHA is 360’ of 8” X 2” Drill Collars, 900’ of 5” HWDP with an ID of 2.5” and 5”, 19.50, NC 50 drillpipe with an ID of 4.276”. The plan is to spot a 100 bbl LCM Pill with the same mud weight as the mud 12.5 ppg.

Describe how this pill is spotted, show bbls to displace the pill

I need formula for calculating ECD in aerated drilling (Drilling with the air being injected into mud through Standpipe)