Category Archives: Oil Field Knowledge

What are the differences between Formation Integrity Test (FIT) and Leak Off Test (LOT).?

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You may confuse between Formation Integrity Test (FIT) and Leak Off Test (LOT).

They are different in this following aspect.

Leak Off Test – you pressure test shoe and formation until formation break down.

Let’s I explain more about it: Leak off Test is conducted in order to find the fracture pressure (fracture gradient) of formation and shoe. When conducting the LOT, you will pump drilling fluid to until you see the fracture trend of formation. Once formation is fractured, the first pressure that deviated from a trend is typically called Leak Off Pressure. We use the leak off pressure to calculate LOT.

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Driller’s Method Quiz No. 2

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Let’s take another quiz regarding driller’s method.

Before start the first circulating, you have the following information

Original Shut in Drill Pipe Pressure = 500 psi

Initial Circulating Pressure (ICP) = 1500 psi

After end of 1st circulation of Driller’s Method, the drillpipe pressure gauge and the casing pressure gauge shows that the circulating drill pipe pressure = 1500 psi and casing pressure = 500 psi (see the figure below).

What do you think about this well?

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Drilling Formulas Facebook Fanpage

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Some of you guys may not know about drillingformulas.com facebook fanpage.

Today, I would like to share the fanpage of my blog. I will share my information into the fanpage so we will connect together.

Please Like my page  as well ^_^

Click Here>> Drilling Formulas Facebook Fanpage

Drilling Formulas Fanpage

I wish you would enjoy reading and learning from my blog and my fanpage.

Keep in touch.

Rachain J.

What is a trip tank?

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Trip Tank is a small metal tank with small capacity about 20-40 bbls with 1 bbl divisions inside and it is used to monitor the well. There are several operations that we can use the trip tank to monitor the well as follows;

1. Trip Out Of Hole (TOOH): While tripping out of hole, the trip tank is used to track volume of mud replacing volume of drill string. The volume of mud should be equal to displacement volume of any kind of tubular tripped out of hole.

2. Trip In Hole (TIH): While tripping in hole, the drilling string (bit, BHA and drill pipe) is ran back in the hole, the trip tank must be use to keep track volume gain. The expected volume gain should be equal to the displacement volume of whole string.

Learn more about pipe displacement

3. Flow check: The trip tank is utilized to determine well condition in order to see if the well is still under static condition.

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What is Flow Check?

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I got question from my friend about

What is flow check?

How is it executed?

platform rig

This blog post will demonstrate you about flow check.

What is flow check?

Flow check is the period that you stop operations such as drilling, tripping pipe and circulating and monitor the well in order to see whether the well is static or not. The time for flow check should be enough to confirm the status of a well. It might be few minutes or it could be as long as 30 minutes depending on the well situation. Normally, many operators require 15 minutes flow check if the well is in normal condition.

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