Mud leg provides hydrostatic pressure in order to prevent mud going through the separator into the rig. If the pressure in the mud gas separator exceeds hydrostatic pressure provided by mud leg, gas blowing through situation will be happened. Once blow-through occurs with a mud gas separator, it is very difficult to stop this situation until the mud leg column is re-established.


Figure 1 illustrates mud-blow through. The pressure that will create blow-through can be calculated by determining hydrostatic pressure of mud leg. [click to continue…]


Determine Correct Initial Circulating Pressure (ICP)

by DrillingFormulas.Com on May 23, 2015

Correct initial circulating pressure is very important for well control operation because the correct ICP figure will tell you about the balance point while circulating the influx out using Driller’s method. Many people get confused when they try to get the right ICP because they tend to forget about a safety factor that is added while bring the pump to speed. Hence, the ICP with unintentionally added safety margin may fracture formations downhole because people will tend to add more safety factor while circulating. It means that excessive safety factor added into the system will make the well control operation worse.

determining-Correct-Initial-Circulating-Pressure [click to continue…]



Top Drive colliding the rig is one of the major incidents which sometimes are happened in oil and gas industry.



This VDO below shows how this accident was occurred on the rig. This is just only 51-seconds in length but it will raise your awareness about rig safe work practices. [click to continue…]


Brine Density with Temperature Correction Calculation

by DrillingFormulas.Com on May 17, 2015

Temperature has an effect on brine density so it is very critical to compensate loss of density due to temperature. Higher wellbore temperature will reduce the brine density more.  The calculation below demonstrates how to determine brine weight to mix on surface in order to get required brine density at a wellbore condition.

Brine-Density-with-Temperature-Correction [click to continue…]


North Sea is one of the toughest offshore conditions on the planet because extremely high wave, wind and unstable sea state. We would like to share some very interesting VDO showing conditions of rig/platform in the North Sea.

Huge waves crash against swaying North Sea oil rig

[click to continue…]


Cement squeeze and balanced cement plug are one of the most critical cement jobs on drilling sites. It is very critical to have the correct volume of cement and displacement in order to be successful in this operation. We create simple Excel spread sheets for both operations and these sheets are free for you to download. However, you need to carefully read the details below to understand the limitation of these two files because the calculations are based on specific criteria.


Cement Squeeze and Balanced Plug

[click to continue…]


May 5 (Reuters) – Mexican oil company Pemex said an accident on Tuesday has left an offshore maintenance rig in the southern Bay of Campeche listing, killing two workers, but has not affected crude production.

Accident of Jack Up Rig Offshore Mexico 1

Pemex said the Troll Solution rig, which was contracted to operate in Pemex’s Abkatun-Pol-Chuc shallow water oil field, was positioning itself to carry out maintenance on wells linked to the Caan Alf platform.

It earlier reported that two workers had suffered minor injuries. [click to continue…]


Directional Drilling Disaster ?

by DrillingFormulas.Com on May 1, 2015

Have you ever seen this VDO?

In the VDO, it stated that this was a false calculation which was result this directional drilling disaster. However, when we see this footage, we don’t really believe that this situation was happened for oil and gas drilling. 

directional disaster myth [click to continue…]


This example demonstrates the calculations and the steps of the stripping with volumetric control so it will help you understand about what calculations required are and how to perform the stripping with volumetric control.

stripping with volumetric well control

Gas kick at the bottom but the drillstring is out of bottom. The kick is introduced while pulling out of hole and the following information below is the well information. [click to continue…]


Have you ever imagined about the down hole conditions of oil and gas wells? 


We initially think that they might look pretty smooth tubular with perforated holes and down hole tools. Until we’ve seen these footage, you will be amazed how the technology can help you to look into down hole. They are excellent VDOs because they demonstrate the well conditions in various situations. You can see down hole tools (packer, side pocket mandrel, etc), perforated holes, damaged casing, hole shape, tubular conditions, etc. What’s more, down hole camera can demonstrate how oil and gas wells produce. With this application, it will help oil companies to identify the well production issue more accurately. [click to continue…]