Understand about Formation Pressure in Drilling

by DrillingFormulas.Com on January 25, 2015

Formation pressure is important information for well planning and operation because it impacts on several things as well control, casing design, drilling fluid program, pore pressure prediction, etc.  We will discuss about formation pressure in a basic term for drilling personnel.

During an era of sedimentation and erosion, little grains of sediment are constantly building above each other, usually in an environment of full irrigation. As the sediment thickness of the base layer increases, the sediment grains are packed strongly near to each other, and some water is excluded from the small pore spaces. Though, if the pore spaces through the deposit sediments are connected to the top pressure surface, the fluid at any depth in the sediment will be same as that which would be found in a simple column of fluid.


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Choke Line Friction pressure (CLF) has directly affect on the bottom hole pressure while performing well kill operation in a deepwater operation. You may be able to circulate the kick out of the well without breaking the shoe down with the current mud weight however; the well can be fractured when the kill weight mud reaches the surface due to excessive CLF.


How Kill Weight Mud and CLF Will Break the Shoe

When the kill mud is circulated from the bit to surface as per the second circulation of driller’s method, drill pipe pressure is held constant and the choke is gradually opened. Once the choke is in the fully open position, the back pressure due to choking back the well is gone but the CLF is still there. With the heavier weight, the CLF with KWM will be more than the CLF with the original mud. If the hydrostatic pressure is more than the fracture pressure, the formation will be broken down.  Let’s take a look at the following calculation to get clearer picture of this topic. [click to continue…]


Platform Installation Video

by DrillingFormulas.Com on January 13, 2015

This is amazing footage about platform installation. The 14-minute footage will show you the process of offshore platform installation and this will show give very clear picture of how people install the offshore process facility. Please check out the VDO below :)

What will you see in this footage? [click to continue…]


How To Compensate Choke Line Friction For Deep Water Well Control

by DrillingFormulas.Com on January 11, 2015

Choke line friction pressure will increase bottom hole pressure while circulating to kill the well therefore it must be compensated in order to maintain the bottom hole pressure relatively constant. This section will describe how to compensate the choke line friction while bring pump up to speed.

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How To Measure Choke Line Friction (CLF) for Deepwater Well Control

by DrillingFormulas.Com on January 7, 2015

Choke Line Friction is one of critical figures that personnel on the rig need to know and this numbers can be determined.


The procedures for the choke line friction determination are as follows;

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Why Was This Well Control Situation Happened?

by DrillingFormulas.Com on January 4, 2015

You need to watch the VDO below. It demonstrated the situation before the blowout was occurred.

These are some possible root causes which contributes to this situation.


  • Improper hole fill
  • Lack of properly tracking the trip sheet
  • Incompetent crew
  • Full Openning Safety Valve and IBOP were not properly prepared to stab in. The crew were looking at them when they found out that the flow was coming up from the drillstring.
  • No float valve in the drillstring
  • Take to long to shut the well in. You can see only 4 minutes before the massive blowout was blowing on the rig floor.
  • Lack of well control knowledge and training
  • Possible to swab the well in
  • What do you think about this well control situation?

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What is the longest, deepest and largest hole ever drilled on earth?

by DrillingFormulas.Com on December 21, 2014

This is very interesting information about the longest, deepest and largest hole ever drilled on earth. You will be amazed how people can overcome the limit of nature.


Longest Hole

In May 2008, GSF Rig 127 operated by Transocean drilled (BD-04A) in the Al Shaheen Oil Field for Maersk. It has a measured length of 40,320 feet (12.3 km) with a horizontal section of 35,770 feet (10.9 km). Maersk Oil’s well also extended the company’s previously held world record for the longest horizontal well by 9,000 feet (2.7 km). The entire horizontal section of the well is placed within a reservoir target which is only 20 feet (6 m) thick. And it was completed in 36 days. Incident free. [click to continue…]


Beautiful Oilfield Calendar 2015 Free Download

by DrillingFormulas.Com on December 20, 2014

In next few days, we will pass 2014 and start a new journey in 2015. For this year, we would like to make a special oilfield calendar 2015 for everybody. There are a total of 12 months with different themes and you click on each image to download the big files. You can set each photo on your computer screen.


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Choke Line Friction – How Does It Affect Deepwater Well Control?

by DrillingFormulas.Com on December 16, 2014

Choke line friction (CLF) is the frictional pressure which is generated while circulating mud through choke or kill line. For surface stack, the choke line friction is negligible because the choke line is short therefore the friction pressure is so small. However, the choke line friction in deepwater operation has a big effect bottom hole pressure. Killing the well without considering the CLF will add excessive pressure and it increases the chance of fracturing formation at casing shoe or anywhere in the well.

choke-Line-Friction [click to continue…]


Oilfield Casing Data Sheet Free Download

by DrillingFormulas.Com on December 12, 2014

Casing information is very important part of working in the oilfield. This information is used in several calculations as expected displacement volume, cement calculation, stuck pipe calculation, burst/collapse, casing design, etc. Therefore our team collects casing data into one spreadsheet and pdf file for you to download.


What is Information inside the Casing Data Spreadsheet?

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