Well in an Unbalanced Condition (Video)


The well is in an underbalanced condition while pulling out of hole. You can see in the video below that the fluid is flowing up from the drill pipe side. It is such very important to understand the condition of the well and have the plan to deal with it.


These are some thought about this situation from our member in the Facebook fanpage.

Hossam Hamza – Looks like it was failed balanced cement plug job, I see long cement chiksan line on rig floor and circulating head connected with low TQ valve above 1 joint DP in mouse hole, the back flow due to over displacement. Is my guess right???? Continue reading

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Magnetic Declination and Grid Convergent and Their Applications in Directional Drilling


This article will describe about Magnetic Declination and Grid Convergent and how to use them for directional drilling purposes.

Magnetic Declination

In the azimuth reference, three North references are Magnetic North, True North and Grid North (Figure 1). Since these 3 North references are not the same direction; therefore, it must be a correction in order to convert any Azimuth in the same reference. Two main concepts, which are magnetic declination and grid convergent, are used to AZI from the magnetic tool to the AZI referencing to the Grid North.

Figure 1 - True North, Magnetic North and Grid North

Figure 1 – True North, Magnetic North and Grid North

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Latitude, Longitude and Drilling Map Projection


Directional drilling maps are flat, but the Earth is an oblate spheroid. This leads to a challenge to accurately represent the wellbore position on the Earth on a piece of paper. In this section, you will learn about mapping techniques used in directional drilling, limitations and the errors of mapping techniques.

One of the most important concepts of mapping is latitude and longitude.

Latitude is a coordinate used to specify the north-south position of a location on the surface of the Earth. Latitude is an angle which starts from 0° at the equator to 90° at the Earth North-South poles. It is simply defined like this;

  • 0 ° at the equator
  • +90 ° at the North pole
  • -90 ° at the South pole

To define latitude, it is described in degrees, minutes and seconds. Parallel line of latitude is a small circle at particular latitude which is parallel with the Equator.

Figure 1 - Latitude and Longitude Diagram

Figure 1 – Latitude and Longitude Diagram

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Shape of the Earth and Geodetic Datums for Directional Drilling


Directional drilling relies on mapping system to accurately identify location of the wells. Therefore, it is very important to learn the basics of mapping and other relevant information. This topic is about Geodetic Datum.

The Earth is not a complete sphere shape but it is actually Oblate Spheroid (“Spheroid”). It means that the shape of the Earth is almost a sphere. It can be proven from the fact that the equatorial diameter (the longest diameter) is approximately 12,756 km and the diameter from the North Pole to the South Pole is approximately 12,714 km (Figure 1). Additionally, the Earth has a different attitude based on location. So, people developed a model to help describe the Earth, which is called “Geodetic Datums”.

Figure 1 - Earth Shape

Figure 1 – Earth Shape

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Overview of Slips and Elevator Used in Upstream Drilling Industry


This article will explain the overview of slips and elevator which are very important tool on the rig.


Slips are wedge-shaped gripping devices which are used to suspend the drill string in the hole. They fit around the body of drill pipe and wedge in the taper of the rotary table’s opening. Slips have serrated inserts or dies that will grip the outside diameter of the tubular when it is set on the rotary table. To set the slips, rig crews place them around the pipe and the driller then slowly lowers the pipe until the slips can take up the load. The dies in the slips will firmly hold the pipe. In order to remove the slips, rig crew grasp the slip handles and as the driller picks up the pipe, they lift them out of the rotary table opening and set them aside.

You can watch this video to see how the rig crew set and remove the slips

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