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Difference between True Vertical Depth (TVD) and Measured Depth (MD)
I have a question asked regarding what the differences between True Vertical Depth (TVD) and Measured Depth (MD). Today, I will describe both definitions and their importance for calculation in a...
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How To Determine Hole Size By Fluid Caliper
This article will demonstrate you how to determine hole size by fluid caliper. First of all, you need to know what is the fluid caliper is. The fluid caliper is one simple way to calculate hole...
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Total Bit Revolution in When Running A Drilling Mud Motor and Rotating At...
I’ve got an email asking me about how to figure out the total bit revolution (RPM) at down hole when the mud motor is used in the drill string and the rotating at surface is also conducted. There are...
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Critical Flow Rate – Drilling Hydraulics
Critical flow rate is the flow rate at the transition point between laminar and turbulent flow. The first step of the critical flow rate determination is to figure out the critical velocity and then...
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Equivalent Circulating Density (ECD) Using Yield Point for MW less than 13 ppg
Another way to determine equivalent circulating density (ECD) is to use yield point. This formula below is used to calculate the ECD and it is good for mud weight less than or equal to 13.0 ppg. Where:...
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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 Where: ECD is...
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Volumetric Well Control – When It Will Be Used
Volumetric well control method is a special well control method which will be used when the normal circulation cannot be done. It is not a kill method but it the method to control bottom hole pressure...
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How to Select a Scientific Calculator for Oilfield Personnel
Working in the oilfield, you need a scientific calculator to help you solve problems with complex formulas. As you learn from this website, drillingformulas.com, you really need a scientific calculator...
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Drill Collar Weight Calculation To Prevent Drill Pipe Buckling
Drill collar provides weight to the bit for drilling and keep the drill string from buckling. Additionally, drill pipe should not run in compression because it can get seriously damaged therefore we...
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Margin of Overpull in Drillstring
Margin of overpull is additional tension to be applied when pulling the stuck drill string without breaking the tensile limit of the drill string. This is the difference between maximum allowable...
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Understand Pressure Loss (Frictional Pressure) in Drilling System
Frictional pressure is pressure loss acting in the opposite direction of fluid flow and today we will look into each component in pressure therefore you will get clearer picture about the frictional...
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Buoyancy Factor Table Free Download
Buoyancy factor is the factor that is used to compensate loss of weight due to immersion in drilling fluid and you can find the calculation from here...
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Buoyancy Factor with Two Different Fluid Weights in The Well
Buoyancy Factor is the factor that is used to compensate loss of weight due to immersion in drilling fluid and you can find more information from this article > buoyancy factor calculation . In...
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Volume of Cutting Generated While Drilling
While drilling, cuttings are generated every footage drilled and this topic will demonstrate how to determine volume of cutting entering into the wellbore. Figure 1 - Cutting Generated While Drilling...
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Coring Cost Per Footage Drilled
Coring is a special process to recover wellbore rock in the well. Figure 1 - Core from the well. Credit – Wikipedia This article will demonstrate how to calculate coring cost per footage recovered....
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Solid Density From Retort Analysis Mud Calculation
Retort analysis is the method to determine solid and liquid components in the drilling fluid. In this article, we will adapt mass balance and retort analysis data to determine solid density in the mud....
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How Does 1029.4 Come From?
1029.4 is used in several calculations in the oilfield and we’ve been asked about what is 1029.4, how it comes from, why it needs to be this figure so in this article, we will show you how 1029.4 comes...
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Driller’s Method or Wait and Weight Method – What is The Practical Well...
Driller’s method and wait and weight method (engineer’s method) are widely used to circulate wellbore influx while maintaining bottom hole pressure constant. There are a lot of opinions regarding which...
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Drill Bits VDO Training
Drilling bits are one of the key tools to achieve good performance drilling and there are several types of bits. Therefore, personnel need to understand in order to use the right bits for the task....
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Fatality Drilling Rig Accident, Oilfield Worker was Knocked 6 feet to the floor
This is the oilfield incident resulting in our friend working on the rig got killed. It is very important that we need to heavily focus on the safety. Every year, people get injured due to several...
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