Written by Vince Delbrugge, Manager,
Unconventional Drilling Operations
On April 8th,
I was one of five ABARTA Energy employees to tour three local factories owned
by TMK IPSCO that make the steel tubular products that we use to drill and
complete our wells. Manufacturing processes used to make the pipe include those
that are icons for Pittsburgh and the Ohio Valley: melting, casting, forming and cutting of steel. Dan Allen and Doug Dye, representing Miller Supply, and
Tony Cargo, representing TMK IPSCO, hosted the tour. After meeting in Robinson
Township for breakfast, we drove to the three different facilities in Ambridge
and Koppel, Pennsylvania and Brookfield, Ohio (see map below highlighting
locations) to watch production and learn how their operation influences ours. I
describe some of the interesting processes in this article.
(1) Plant Tour Locations |
The Koppel facility
is modified to melt and cast the types of steel used for our applications.
Electric arc furnaces use huge amounts of electricity to melt steel scrap which
is the first operation of manufacturing tubing and pipe. Melting in an arc
furnace is a spectacular event. Like lightning in a big bucket, thousands of Amperes
of electric current spark between graphite electrodes and the steel. Both electric
current and radiating light easily
add enough heat to reach the steel melting temperature of nearly 3,000˚F.
Sophisticated technology is used to measure and modify the amount of elements
in the molten steel before they are cast into the solid, cylinder-shaped,
billets. Small, precise amounts of carbon, manganese, chrome, molybdenum and
other elements are specified and controlled in the molten metal that is about
97% iron. Scrap metal for melting is
limited to certain steels, because some elements cannot be removed or reduced
once they are melted.
(3) Electrodes melting steel in the arc furnace. |
(4) Continuous casting the round billets at the Koppel
facility.
|
Billets cool
and solidify in the Koppel factory with the shape, properties and element
composition that all influence quality of the finished pipe. After cooling to
room temperature, the billets are transported by truck to the factory in
Ambridge where we watched them form the solid billets into the sizes and shapes
for our oil and gas applications. The metal is stretched, bent, twisted and
squeezed using a variety of traditional cold and hot processes that are
performed at different temperatures ranging up to 2,300˚F. The first forming
process at Ambridge is rotary piercing which creates the hole in the pipe that
is called the inner diameter. This interesting process is illustrated below in
details (a) through (d). Details (e) and (f) are sections of billets that were
photographed after interrupting the rotary piercing process and cutting the
billets that show the growth of the inner diameter. Subsequent forming
processes at Ambridge refine the diameters, roundness and straightness of the
tubular material that we need for our oil and gas operations. Heating and
cooling processes called quench and temper change the atomic structure of the
steel to increase its strength.
(5, 6 & 7) |
Size and shape of the pipe and tubing is complete when it
leaves Ambridge, but it cannot be used yet for oil and gas operations. Almost
all of our tubular products are connected together with screw threads, which
are cut into the ends of the products at the Brookfield, Ohio facility (see below). We had
the opportunity to watch an Okuma lathe cut threads into the outer diameter of
pipe used for our production casing, which is the pipe that extends from the
surface to the bottom of the well. Okuma lathes and many other machine tools
can maintain tolerances of 1/10,000ths of an inch, which is more
precise than is required for successful pipe connections. Roundness,
straightness and other shape tolerances of pipe products and other structural
materials created during forming are the most important factors that determine
our pipe connection quality, and we saw the extensive inspection operations at
Brookfield diligently monitoring those properties both before and after cutting
the threads. Some of the pipe from Ambridge must be rejected at Brookfield
because the threads cannot be successfully cut due to the shape distortion.
(8) Pipe threads cut on a lathe at the Brookfield, Ohio facility. |
(9) Coolant is used while the
tungsten-carbide tool moves along the billet to remove metal and cut the thread
geometry.
|
Working with suppliers gives us knowledge about their
capabilities that will help our planning for our wells. Visiting the different
facilities gave us the chance to observe processes that are critical in the
path of manufacturing our casing, tubing and drill pipe, and we know how to
evaluate the important characteristics and improve the quality of our wells. We
are grateful to TMK IPSCO for the opportunity to tour their facilities and
purchase material for our wells that is made here in our region.
Image References.
[1] Image from Google Earth.
[2] Image by Anthony Cargo.
[3] Mr. Blaaaaah. An Electric Arc Furnace’s Three Graphite
Electrodes. Web. http://www.reddit.com/domain/siemens.com/.
[4] Web.
http:/www.alibaba.com/product-detail/TIEQI-High-Performance-flexible-dummy-bar_56…
[5] Schematic of the rotary piercing operation. Web. http://en.wikipedia.org/wiki/File:Schraegwalzen.png. Modified by Vince Delbrugge.
[6] E. Ceretti, E.; Giardini, C.; Attanasio, A.; Brisotto, F.; and Capoferri,
G. Figure 6. Longitudinal
section of the rod, start and development of the hole, in FEM Analysis of Rotary Tube Piercing Process.
Web. http://www.tubenet.org.uk/technical/piercing.html. Modified
by Vince Delbrugge.
[7] E. Ceretti, E.; Giardini, C.; Attanasio, A.; Brisotto, F.; and Capoferri,
G. Figure 7. Α 3˚, Formation of the internal hole in the rolling
direction: =Comparison between simulation and experiment, in FEM Analysis of Rotary Tube Piercing Process.
Web. http://www.tubenet.org.uk/technical/piercing.html. Modified
by Vince Delbrugge.
[8] Industrial Piping Specialists,
Incorporated. Web. http://www.ipipes.com/?page_id=144.
[9] Okuma. Web. http://www.okuma.com/loc-series-oil-country-lathe.