Rachain Jetjongjit's Blog (47)

Mud motor failure downhole may be happened from time to time. The questions that are usually raised are things like “How do I know if the mud motor fails down hole?” and “What indications will I see that this has happened?” etc. Due to this, I would like to share my personal experience regarding mud motor failure and its symptoms.…

Drilling waste minimization is a method to reduce any waste generated from drilling operation. The ideal goal of it is to generate zero residue requiring final disposals. People have developed technologies for two main reasons which are project cost reduction and environmental protection.

Typically, the drilling waste minimization starts with reducing amount of drilling waste, recycling and recovering waste…

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 simple way to calculate hole diameter. The concept is based on hole volume, annular capacity, and inner capacity. You pump any substance and when you seen it on surface, you back calculate the hole size based on strokes pumped. It is quite tricky to explain so I would like you to see the example below which it will make you clear…

I’ve got an email asking me about how to figure out the total bit revolution (RPM) at down hole when the mud motor is used in the drill string and rotating at surface is also conducted.

There are two components contributing in the total…

(Mud weight is high enough to overcome overburden stress.)…

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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 volume as per specification and displace volume. After reading and understanding the concept, you will be able to apply to your cement job.

The knowledge required:…

Trip Sheet

pH is a value representing the hydrogen ion concentration in liquid. We use it to indicate acidity or alkalinity of drilling mud especially water base mud. Let’s talk about general of the pH. The pH is presented in a numerical value (0-14) which means an inverse measurement of hydrogen concentration in the fluid.

The pH formula is listed below;…

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Newtonian fluid model is the simplest rheological model. Let’s describe in the mathematical way, a relationship between shear stress (lb/100 ft2) and shear rate (1/sec), named a consistency curve, is a straight line which passes through the original (see the figure below).…

The gel strength is the shear stress of drilling mud that is measured at low shear rate after the drilling mud is static for a certain period of time. The gel strength is one of the important drilling fluid properties because it demonstrates the ability of the drilling mud to suspend drill solids and weighting material when circulation is ceased.

How can we get…