Advanced drilling systems Page: 1 of 7
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ADVANCED DRILLING SYSTEMS
K. G. Pierce
Strategic Studies Center
Sandia National Laboratories
J. T. Finger
Geothermal Research Department
Sandia National Laboratories
This paper discusses the methods and results applies to tho
of a study of advanced drilling systems sponsored study.
jointly by the Department of Energy Geothermal
Division and the Natural Gas Technology Branch, A Systems A
Morgantown Energy Technology Center. Work Nearly
performed at Sandia National Laboratories is systems conc
supported by the U.S. Department of Energy under There is ofte
contract DE-AC04-94AL8500. methods wou
Introduction entire system:
Drilling is ubiquitous in oil, gas, geothermal, could be sp
minerals, water well, and mining industries. drilling techno
Worldwide expenditures in oil and gas drilling facets of the
approach $75 billion per year. Lower cost wells ment of the s
could make it economically viable to exploit low not just inve
yield and depleted oil and gas reservoirs. Drilling rock, but ha
and well completion account for 25% to 50% of systems neces
the cost of producing power from geothermal The fo
energy. Reduced drilling costs will reduce the cost formed by all
of electricity produced from geothermal resources. not a necessa
Attempts to improve or replace rotary drill- could be dril
ing technology date back at least to the 1930's. completion is
Many novel and even exotic concepts were exam- (1) it is nece
ined in the 1960's and 1970's and there has been (2) it is a sign
some continuing effort through the 1980's. Much
of this effort is documented in two books by Bill B
Maurer: Novel Drilling Techniques (1968) and
Advanced Drilling Techniques (1980). - Energy
Undoubtedly, there are concepts for ad- interfac
vanced drilling systems that have yet to be studied. - Rock re
However, the breadth and depth of previous efforts - Debris r
in this area almost guarantee that any new efforts - Borehol
will at least initially build on an idea or a variation - Well co
of an idea that has already been investigated. - Comple
Therefore, a review of previous efforts, coupled
with a characterization of viable advanced drilling In addi
systems and the current state of technology as it
B. J. Lives;
se systems, provide the basis for this
all studies of advanced drilling
entrate on methods of reducing rock.
n little or no discussion of how these
Ld fit into the full system necessary to
n, and complete a well. Unless the
is considered, much effort and money
ent improving specific aspects of
nology only to discover that other
problem prevent successful deploy-
ystem. Consequently, this study has
stigated novel methods for reducing
s examined all aspects of drilling
sary to drill and maintain a wellbore.
Blowing six functions must be per-
drilling systems. The last element is
ry function in the sense that a well
led without completion. However,
considered a basic function because
ssary for a well to be of any use and
nificant part of the cost of a well.
asic Drilling Functions
transmission to the system-rock
e maintenance while drilling
tion to the above drilling functions,
tty~ ''i nU UlJtJ.' a t dJ tL l~ t t
DiSTR1BUTiON OF TH13 DOCENT IStL.WE
any sys em mus aso opera U1n er a eas e
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Pierce, K. G.; Finger, J. T. & Livesay, B. J. Advanced drilling systems, report, December 1995; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc664531/m1/1/: accessed December 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.