PETROLEUM DRILLING OVERVIEW
Drilling Oil and Gas Field
We
are now already drilling our first wildcat well or maybe development well. Here in in this article, we'll discussed the
fundamentals of drilling in petroleum (oil and gas) well, if all goes for the
plan in the next few years will bring a new oilfield into production.
Drilling oil and gas field to production
Petroleum Reservoirs
As
we know that we studied how oil was formed how it accumulated and how it was
stored in underground reservoirs. With this knowledge, we were then able to go
looking for oil in locations that would most likely contain commercial
petroleum accumulations, later by applying scientific principles of petroleum
reservoir formation. We acquired, processed, and interpreted data from the most
interesting locations which then, would allow us to pinpoint exactly where we
would drill our first wildcat well.
Petroleum reservoirs
Subsurface Location
Wild Cat Drilling
Even
though we know that there is only a one in four chance of finding oil in
commercial quantities when drilling with no one has drilled before, we obtain
permission from the owners of the land.
Wild cat drilling
Planning, Equipment and Manpower
After
we obtain permission of the land, the access has been secured we are ready to
initiate the next important step as we get closer and closer to actually going
on site. It is during this crucial phase that many decisions about equipment
and manpower have to be made
Planning decision equipment and manpower
Then
what's on site there are still other additional decisions to make and
procedures to follow to ensure safe, efficient drilling throughout the entire process
whether we find oil and gas or not.
THE DRILLING PREPARATIONS
The Rigs Type
In
this book we’ll discuss, the preparations needed to erect a functioning
appropriate rig on site. We’ll illustrate the types of rigs and their
parameters to help you select the one best suited for our particular site and
drilling program, next we’ll explain the components and functions of the five
main systems of a drilling rig, we’ll present the role of the rig crew and
their importance to the overall a successful safe completion of drilling for
oil and gas.
Types of rigs and their parameters
Five main systems of drilling rig
Drilling Procedures and Engineering Challenges
After
we discus about the Rigs type, we'll highlight some retained drilling
procedures and engineering challenges that must be closely monitored during
drilling, we’ll conclude by describing new technological advances involved in
directional and horizontal drilling and how, they can be used to expand the
reach.
Drilling procedures and engineering challenges
Directional and horizontal drilling
Aim, Conditions Location and Drilling Program
To
help us get started we must first answer some critical questions about the aims
and conditions of our location and drilling program. These choices once made
will better enable us to successfully drill in the spot we have selected, for
instance what kind of rig we need, that will depend on whether we drill on land
or offshore
Choice of the aims and conditions of location and
drilling program
Engineers
create a well plan and a wellbore design for every well before it is drilled. A
typical wellbore architectural diagram for an onshore well is shown in figure
011. The wellbore diagram shows the hole and casing sizes needed to drill the
well to its desired depth.
Location Accessibility, Tools and Equipment
If
we drill on land then is the location, accessible by local roads or is it in a
remote location. Or our tools and equipment suited for the land conditions and
whether we will find on location. if we drill over water how deep and how come
will the water be while we are drilling, or our tools and equipment suited for
the offshore conditions and whether we will find on location, do we expect the
oil zone to be near the surface and what is call a shallow well or do we expect
the oil zone to be deep what is the estimated depth that we planned to drill to
reach the target.
The location - accessible by local roads or a remote
location
Tools and equipment suited in Deep water
Others Considerations
There
are several Others Considerations such
We’ll the drilling take place in low or high pressure zones?, are there
environmental restrictions?, what procedure will we be required to follow to
protect water animals air quality what about noise? what are the laws?, how do
we ensure that we are in compliance?, without the penalties if we are not, our
trained drilling crew and rigged equipment available during our time lines?.
Pressure zones, environmental restrictions, procedure to
protect water animals air quality & noise
As
you can see from this very limited list of questions that will need to be
answered at the very top is the need to select and appropriate rig for the
designated location for the specific depth and the environmental conditions.
List of questions to select and appropriate rig
For
further read, you may get the book from amazon.
PETROLEUM DRILLING OVERVIEW
References:
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