Drilling Problems
Drilling Problems
Drilling Problems
Students:
● Mohamed Aly El Maaloum 2213
● Mohamed Aly Ahmed Tah 2207
● Sidi Ahmed Mohamed Lemine 2209
Submitted to:
Teacher Vadila Sidina
Contents
❖ Introduction
❖ Types of drilling problems
● Pipe sticking
● Loss of circulation
● Hole deviation
● Pipe failures
● Borehole instability
● Mud contamination
● Formation damage
● Hole cleaning
● H2S-bearing zones
● Shallow gas zones
Drilling a well is a lot of work and there is a risk of problems. But, even if
something goes wrong, we can usually fix it. There have been reports of
problems with drilling in certain areas where drilling has been done before,
because the formations there are not all the same. This means that the conditions
in two wells can be very different.
Types of drilling problems
When drilling, it's important to plan your work in advance so that you're not
worried about potential problems. Rather, you should focus on preventing them
from happening in the first place. If you have a problem with your drilling, it can
cost you a lot of money.
Lost circulation
Loss of circulation is the uncontrolled
flow of whole mud into a formation,
sometimes referred to as a “thief zone.”
Hole deviation
It is the unintentional departure of the drill bit from a preselected borehole trajectory.
Whether it involves drilling a straight or curved-hole section, the tendency of the bit
to walk away from the desired path can lead to drilling problems such as higher
drilling costs and also legal problems.
Mud contamination
A mud is said to be contaminated when a foreign material enters the mud system
and causes undesirable changes in mud properties, such as density, viscosity, and
filtration. Generally, water-based mud systems are the most susceptible to
contamination.
Formation damage
Formation damage is defined as the impairment to reservoir (reduced production)
caused by wellbore fluids used during drilling/completion and workover
operations.