Buoyancy Factor with Two Different Fluid Weights
in The Well
by DrillingFormulas.Com on March 17, 2014
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 a

Increase In Mud Weight Due To Cutting
by DrillingFormulas.Com on March 7, 2014
Cutting generated while drilling will increase drilling fluid density and it will finally affect equivalent
circulating density while drilling. In this topic, we will talk abou

Maximum ROP Before Fracture Formation
by DrillingFormulas.Com on March 11, 2014
In this topic, we will apply the effective mud density formula to determine maximum ROP before fracturing
formation.
Figure 1 Max ROP before
Fracturing Formation
These two equ

Coring Cost Per Footage Drilled
by DrillingFormulas.Com on April 16, 2014
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 foot

Volume of Cutting Generated While Drilling
by DrillingFormulas.Com on March 30, 2014
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 - Cut

How Much Force Applied to Rig Tong To Get The
Right Torque at The Connection
by DrillingFormulas.Com on July 1, 2014
One application of the rig tong is to use to make up connection. The question is asked about how to get the
right torque value to the conn

Block and Drilling Line Calculation
by DrillingFormulas.Com on July 29, 2014
This article will focus on block and drilling line calculations as block efficiency, drilling power input/output,
etc. Additionally, there are some examples which will help you u

Rig Engine Power Consumption and Engine
Efficiency
by DrillingFormulas.Com on July 7, 2014
In this article, we will focus on the rig engine power consumption and overall engine efficiency and there are
few examples for you to get more understand on how to

Cement Transition Period in The Oil Well Can
Cause Well Control Situation
by DrillingFormulas.Com on February 26, 2013
When cement is in transition period (forming the bond), you will lose some hydrostatic pressure because
cement becomes solid phase there

Kick Tolerance Concept and Calculation for Well
Design
by DrillingFormulas.Com on May 16, 2013
Kick tolerance is the maximum gas volume for a given degree of underbalance which the circulation can be
performed without exceeding the weakest formation in th

Fracture Gradient Reduction Due to Water Depth
by DrillingFormulas.Com on August 10, 2014
Fracture gradient is one of the critical information which drilling engineers need to know in order to design
drilling programs. For the well control stand point, th

How to Select a Scientific Calculator for Oilfield
Personnel
by DrillingFormulas.Com on March 24, 2013
Working in the oilfield, you need a scientific calculator to help you solve problems with complex formulas.
As you learn from this website, drillingform

Determine Bottom Hole Pressure from Wellhead
Pressure in a Dry Gas Well
by DrillingFormulas.Com on December 3, 2014
Gas behaves differently from fluid therefore you cannot use a simple hydrostatic formula to determine
reservoir pressure. Gas is compressib

Do you have too much slug in the well?
by DrillingFormulas.Com on June 11, 2012
Slug is heavy drilling mud that is used to pump when you want to pull pipe dry. However, excessive volume
of slug in the well can create higher mud weight and cause the proble

Equivalent Circulating Density (ECD) Using Yield
Point for MW less than 13 ppg
by DrillingFormulas.Com on November 23, 2012
Another way to determine equivalent circulating density (ECD) is to use yield point.
This formula below is used to calculate the EC

Equivalent Circulating Density (ECD) Using Yield
Point for MW More than 13 ppg
by DrillingFormulas.Com on December 10, 2012
Another equation to determine equivalent circulating density is to use yield point.
This formula below is used to calculate the ECD

Pipe Light Calculation
by DrillingFormulas.Com on August 16, 2013
Pipe light, which is a special term in a snubbing operation, describes the condition of the well which well
head pressure and buoyancy acting upward against a cross sectional area of pipe i

Rig Derrick Load Calculation
by DrillingFormulas.Com on September 22, 2013
The drilling line is reeved over a set of crow block and down to another set of sheaves known as travelling
block. The hook connected to travelling block is used to suspend the dri

Applied Drilling Engineering (Spe Textbook
Series, Vol 2) Review
by DrillingFormulas.Com on November 7, 2011
If you would like to learn about drilling engineering, this book, Applied Drilling Engineering Spe
Textbook Series, is my recommendation. The book

Drill Pipe Elongation Due to Temperature
by DrillingFormulas.Com on April 10, 2013
Drill pipe elongation will occur because the higher bottom hole temperature.
Rule of Thumb
Pipe will elongate approximately 0.83 inc per 100 ft of length, per 100 degree F

Determine surge and swab pressure method 2
Calculation Example
by DrillingFormulas.Com on July 12, 2011
This section will show to how to use the formula from the previous topic, surge and swab pressure
calculation 2nd method , to determine surge and swab

Determine surge and swab pressure method 2
by DrillingFormulas.Com on July 11, 2011
This is another method for calculating surge and swab pressure. With this method, there are 3 assumptions as
follows:
Closed ended pipe (plug flow)
Laminar flow around d

Calculate Bottles Required for Koomey Unit
(Accumulator Unit)
by DrillingFormulas.Com on October 24, 2011
This topic will demonstrate you how to determine accumulator bottles required for Koomey Unit
(Accumulator Unit) in order to close the BOP stack.
Thi

Balanced Cement Plug Calculation
by DrillingFormulas.Com on June 6, 2011
You already learn about balance cement plug and I would like to show how to calculate balance cement
plug.
Lets start with the concept so you can imagine how the calculation should b

How To Determine Hole Size By Fluid Caliper
by DrillingFormulas.Com on January 24, 2012
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 si

Stuck Pipe Summary
by DrillingFormulas.Com on October 17, 2011
I have posted several stuck pipe articles and I would like to summarize all articles in one page so you can
use it for future reference.
Stuck pipe categories
There are 3 categories of stuck p

Cutting Carrying Index Simple Tool To
Determine Hole Cleaning
by DrillingFormulas.Com on November 17, 2011
To get the good idea on how good of the hole cleaning is, the another method called Cutting Carrying Index
(CCI) is utilized. The CCI is an empirica

Calculate Cement (Oil Well Cement) Volume
Required
by DrillingFormulas.Com on May 17, 2011
Cement volume calculation is based on annular capacity multiplied by length of cement as per cement
program. This topic will demonstrate you how to determine cement

Difference between True Vertical Depth (TVD) and
Measured Depth (MD)
by DrillingFormulas.Com on November 9, 2011
I have a question asked regarding what the differences between True Vertical Depth (TVD) and Measured
Depth (MD). Today, I will describe both

Hydraulicing Casing Calculation Example
by DrillingFormulas.Com on June 17, 2011
For the previous topic, Hydraulicing Casing (pressure to lift the casing while cementing), you already know
the concept. This topic will demonstrate you how to figure out if