HORIZONTAL DIRECTIONAL DRILLING - Nacap

horizontal directional drilling
a specialist that successfully executes projects, no matter how complex

2 w e h a v e th e k n o w l e d g e to h a n d l e y o u r pr o j e c t
no matter how complex
we have the knowledge
to handle your project

Nacap is an expert in the field of horizontal directional drilling (HDD).
We have used this specialist technique all over the world, solving the
most difficult challenges. Because of our expertise we always find the
most efficient and economical solution for every drilling problem.
We have extensive knowledge of the industry and experience in the field,
to be able to guarantee professionalism and high quality service. We use
our own modern and well maintained equipment to handle your project.
Benefits of horizontal
directional drilling
We have established ourselves as the
leader in HDD industry. HDD constitutes
an important component of many pipeline
construction projects. For more than
twenty years we have employed this
drilling technique as an environmentally
friendly, safe, realiable and efficient
alternative to conventional construction
methods. Horizontal directional drilling
is more efficient, often more economical,
faster and, above all, has much less
impact on the environment. It is also
widely used in the oil and gas, power
and telecommunications industries for
bringing pipelines and cables ashore or
taking them offshore.
The characteristics of HDD make it the
best solution for many customer needs;
in some cases it provides the only practical
solution. Nacap uses horizontal
directional drilling for, among others:
• Waterways
• Nature reserves
• Major roads and traffic junctions
• Railways
• Industrial sites
• Densely populated regions
and urban areas
• Landfalls and outfalls
• Flood plains and bogs
• Unstable soil conditions
• For getting below contaminated
ground.
environmentally friendly
with minimal disturBance
The traditional method of constructing
a pipeline, in which a trench is excavated,
can lead to major obstructions
and objections amongst various authorities
and in different areas. Horizontal
directional drilling avoids breaking open
or causing damage to these areas and
it minimises the impact to the surroundings
of the works.
ThaILaND
sai noi-north/south
Bangkok power plants
gas pipeline project
Installation of 44 crossings by HDD
technology. Total length of 45,000 m
(up to 2 km per crossing). This required
the use of three rigs – one of 180, 275
and 300 tonnes. Major challenges of the
project were the heavy traffic, difficult
access and densely populated and
congested areas.

4 w e h a v e th e ri g h t to o l s fo r th e jo b
no matter how complex
we have the right tools for the job
our specialist equipment -
standard and custom Built
Nacap’s success is partly attributable
to the in­house development and the
use of specialist HDD equipment. Feedback
from projects is integrated in the
design and development of equipment
on a continous basis.
The resulting improvements in effici­
ency and safety contribute to environ­
mentally friendly and timely project
completion, critical issues for Nacap’s
clients.
The rigs used by Nacap are purposebuilt
for tropical and remote locations
and feature computer controlled drilling.
With 9 drilling rigs worldwide, we are
able to meet all of our customers'
requirements. We have developed
several drilling machines ourselves.
These machines have a pulling capacity
of up to 400Te.
To date we have completed more than
700 HDD crossings around the world
in all types of ground conditions for
cables & pipes up to 1,200 mm (48”) in
diameter and over 2,000 m.

hdd in steps
• a pilot hole is drilled according to the pro­
file design. Directional control is achieved
by using the survey steering tool system.
The survey probe installed in the drilling
assembly measures the survey data required
for steering the drilling tool along
the design profile
• The hole is then enlarged and conditioned
in stages using a sequence of reamers/
flycutters/hole openers to the required
diameter for receiving the product pipe
• The product pipe is then pulled into the
hole by the rig
UNITeD KINgDoM
Barton stacey to
lockerley pipeline project
In this project an HDD of 1,125 meter had
to be constructed under a sensitive
location, the river Test. This river harbours
the famous trout fishing industry and
therefore any chance that drilling mud
would escape into the water had to be
avoided. Thanks to excellent team work,
the HDD crossing was completed with
minimal disturbance to the environment.

6 w e h a v e th e e x p e r i e n c e
no matter how complex
we have the experience
our extensive track record
We give the highest priority to working
safely, transparently and with respect
for our environment. We have a con­
vincing track record of successfully
completed projects. These projects
were executed with a level of quality
and professionalism that exceeded our
clients’ expectations.
Nacap always works with clients in
order to devise the best solution. In
2008, for instance, Nacap success fully
completed a horizontal directional dril­
ling shore approach in gresik, east
Java, Indonesia, as part of Kodeco’s
offshore ePCI services for West Ma­
dura and Poleng fields. The hDD pipe
string was a 2,000 m long DN400 (16”)
steel gas pipeline with 1” concrete
coating for buoyancy purpose. This
crossing was the longest shore approach
that Nacap has completed to
date.
Complex logistics, community issues,
security concerns and strict environmental
procedures were just some of
the issues that confronted Nacap during
the West african gas Pipeline project
(WagP) and the BP Tangguh project in
Irian Jaya. Permafrost, marshland,
rock, humidity, densely populated or
remote areas are other conditions under
which projects have been completed.

the landfall method
(onshore option)
• a pilot hole will be drilled from onshore
entry point towards offshore exit point
along a planned profile assisted by down­
hole steering tool system
• The drilled hole will be enlarged using a
sequence of reamers/flycutters from
onshore towards offshore
• Product pipestring fabricated onshore will
be pulled through the reamed hole from
onshore towards offshore by a HDD rig
located onboard the drill barge
INDoNesIa
west madura and
poleng field
Installation of a shore approach of a 16”
submarine gas pipeline by horizontal
directional drilling, measuring 2,000 m
in length, as part of the “West Madura
and Poleng Field” project in east Java for
oil & gas operator, Kodeco energy Co Ltd.

w w w .na c a p .c o m
visiting address
Nacap b.v.
Machlaan 5
9761 TK Eelde
The Netherlands
mailing address
Nacap b.v.
P.O. Box 46
9750 AA Haren
The Netherlands
T +31 (0)50 599 12 00
F +31 (0)50 599 12 22
E info@nacap.com
W www.nacap.com