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State-of-the-Art
Summary
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Figure 2 - Schematic of Baker Hughes Inteq’s
2 3/8-inch rib steering motor.
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Gas
Technology Institute (Field Demonstration of an Existing
Microhole CTDrilling Rig, Kent Perry) This very
successful project is complete. Twenty-three project
wells were drilled in the shallow Niobrara Chalk play in
Western Kansas and Eastern Colorado at an average cost
29% below comparable rotary costs. As the program
progressed, wells were being drilled at a rate of one
per day, faster than they could be permitted. In all,
the rig drilled 220 wells, 300,000 feet of hole, in
2005. A number of obstacles were overcome to achieve
acceptance of the well design of 4 ½-inches with 2
7/8-inch production casing.
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Schlumberger (A Built-for-Purpose Coiled
Tubing Rig, Bart Patton): This project has had a
significant shift in direction. Due to a shortage of
engineering and manufacturing resources and time
constraints, the plan to engineer and construct the rig
from the preliminary design was shelved and an existing
rig, built by Foremost, was purchased from Pioneer
Resources. The controls and injector will be updated to
allow underbalanced drilling. The trailer will be
examined and possibly modified to transport 6,000 ft. of
2 3/8-inch coil. There has been some industry interest
in the rig availability, but no definitive plan has been
set for the field testing.
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Ultima Labs (Microhole Coiled Tubing
Bottomhole Assemblies, Don Macune): The objective of
this project is to develop the main instrumentation
subassembly and instrumented bit subassembly more suited
to shallower, lower pressure and temperature wells
likely drilled as microholes, hence less expensive than
today's 3 1/8-inch tools (which reside for the most part
only in Alaska). The main instrument sub consists of two
sections—probe-based directional sensors, batteries and
mud pulser, and collar-based propagation resistivity.
The near bit subassembly gathers information such as
inclination, gamma ray, weight on bit, torque, pressure
and shock, and transmits the data to the main instrument
sub above the mud motor via a half-duplex wireless
communications link. Two prototypes will be ready for
field testing in the second quarter of 2007.
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Western Well Tool (Microhole Downhole
Drilling Tractor, Bruce Moore) (see Figure 3):
The objective of this project is to produce a downsized
version of the tractor Western provided to set the
coiled tubing well intervention record of 30,000 feet at
Sakalin Island. This will be the 5th generation of this
technology. The prototype is 23 feet long with a gripper
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3/8-inch, expanding to 4.2 inches. It can move 40–50
feet/hour and pull 3,500–5,000 pounds. It has been
fatigue tested to 115,000 cycles, the equivalent of 59
miles of travel. It will be tested in Alaska this
winter.
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Kalsi Engineering Inc. (Advanced Sealed
Bearing Assembly for Positive Displacement Motors used
in Microhole Drilling, M. S. Kalsi): Kalsi Engineering
has just been awarded a DOE grant to manufacture and
test the advanced hydrodynamic rotary seal and load
responsive thrust bearings designed under Phase I. They
will be suitable for use in most of today's positive
displacement motors (PDM) used in coiled tubing
drilling. The seal utilizes film to cause the moving
surface to hydroplane over the fixed surface.
The progress of those MHT projects not
presented at the August 16th meeting were reviewed at the
previous meeting in March. They included: |
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Figure 3 - Profile of Western Well
Tool’s microhole drilling tractor gripper expanded against
hole. |
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Network News
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PTTC |
4th Quarter 2006 |
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