Junk Mill Bit with Interchangeable Inserts ITEC 3380 Managing

Roy Alvarado, David Marrufo
Tony Reyes, and Erin Webster
Here in west Texas
many oil, drilling
and well servicing
companies face a
problem with down
Many of these
companies would
like to reduce
downtime; the
less time spent
changing out bits
and tools the
more profitable
the company is.
Purpose of Project
When drilling or
working over wells
there are times when
pipe is stuck or
broken off when
being pulled out of
the well.
When this occurs you
will go after it with
fishing tools.
Tool design.
Downtime- unproductive rig time, in our case due to
changing milling tools
 Fishing- the process of retrieving a lost object from a well
 Inserts- the interchangeable tool end of the junk mill
assembly which can come in different designs for different
 Junk mill bit- a tool usually used on fishing jobs to prepare
the pipe ends for the fishing tool
 Tungsten carbide rod- a composite rod which consists of
tungsten carbide chips with a brass media, it is used as the
cutting surface on the junk mill inserts cutting edge
Establish a shop
Tool joint material = $50.00/ea
Tool joint Welding Labor (@$20.00/hr) = $60.00/ea
Tool joint Machinist Labor (@$20.00/hr) = $60.00/ea
Insert Material (1” Plate) = $30.00/ea
Insert Welding Labor (@$20.00/hr) = $60.00/ea
Insert Machinist Labor (@$20.00/hr) = $60.00/ea
Welding Rods (per insert) = $3.00/ea
Clusterite Rods (per insert) = $40.00/ea
Total approximate product cost (with 2 inserts): $363.00
86% of people surveyed expressed interest in our
interchangeable inserts
71% would like to reduce downtime on fishing jobs
50% of our customers are willing to pay between $1000 and
$1,200 to buy a tool plus 2 inserts and $300 to re-tip
Or $500 to rent
Making a mill bit
of two parts: Tool
Joint and
Our first model will be
the weld type where the inserts
Will be welded on to the
Tool joint.
Our second model will be
fastened to the tool joint
by a threaded pin that secures
the insert, making it even
easier to exchange.
Product Cost
Many Job Positions
Reduce downtime
These are Baker Hughes junk mills compared to our mill bit tool. Their Superloy junk mill is
designed for the milling of debris where milling inserts are considered too aggressive.
These are Weatherford junk mills compared to our mill bit tool. Their aluminum casing
alignment tool has a simple, but rugged, design-aluminum blades welded to an aluminum
These are GOTCO International junk mills compared to our mill bit tool. Gotco junk mills
are available dressed with super tough Gotcoloy (crushed, sintered tungsten carbide.) They
also have them in many sizes. http://www.gotco-usa.com/millingwashover/junk_mills.html

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