Montana oil and mining journal. [volume] (Great Falls, Mont.) 1931-1953, 1939-05-20
OIL RISES 300

nation from 1895 to 2s4I. before
the heavy rotary mud was unload
ed.
This well had two earlier show
ings OF oil. both said to be larger
than the showing at the top OF the
! Madison lime. One Is q horizon q
bove the Sunburst sand, cores
ponding to the Moulton sand, and
the other is in the Cut Bank SAND.
It is planned to test these horfzons
should the Madison lime production
prove non-commercial after acl-
dization.
No accurate estimate OF the pos
sible showing was obtainable oW-
ing to the fact that the hole was
completed with 3-inch liner. Four
and one-half inch casing was set
at 2A50 feet and a 3-inch liner was
cemented on top OF the pay" ho-
rizOn The baaler used was so small
that il brought up only a few gal
Ions of oil with each run.
After unloading the hole. the
formation was washed. using SO
barrels of Pondera crude. There
was no evidence OF water with the
oil. excepting drilling water. Two
inch tubing was run for this pur-
pose and later was used to intro
duce the acid under pressure.
This well is of unusual interest
for several reasons:
4. 1t is the first well in
the Sweetgrass Arch spotted on
high" revealed by geophys-
ical methods of structure de-
termination. 1t serves TO prove
the accuracy of geophys-
fcaI work In this area, as APP
piled to the Madison lime and
points a degree of certainty TO
Devonian development.
2 IT is the first well to
definitely establish the throw
of the PendrOy fault. IL con-
firTned the seismic survey
measurement OF displacement
of over 500 feet. This fault is
by far the most unusual geo.
logical feature ever developed
in the central Sweetgrass Arch.
3. 1t is the first wildcat
NGAA HI UOAAeA4AA VANAA
portable rotary equipment
which reached "a depth of $3.50
feet although the rig Is intend
ed for only 15OO-foOt drilling.
T.. It brings into Montana
as new operators strong fl
nanoial groups from the states
of Texas and Colorado.
The Pendroy fault discovery is
credited to E. Byers Emrick of
Conrad who confirmed surface in
dications by digging many trenches
down to the shale beds But the
fault is covered over by surface
soil and gravel and it was impos
sible to definitely locate it until the
of the science Of ge-
ophysics and Emrick interested the
Holland Research company of Dem !
yer in the Pendroy area to locate i
this fault.
Finding evidence Of not only the
fault but several defined struc-
lures adjacent to the fault. l.. u
Freeman, vice president of He'll
and Research formed a holding
company known as Zodiac Oil COM
lany of which he is president and
Emrick is vice president. Zodiacs
hen interested Paul Kayser, pres
dent Of Mid States Oil company
II Houston, Texas, and the lat
.er company took over an oper-
lting agreement on the entire lease
block perfected by the Zodiac COW
sring four or five local folds a.
ong the fault
Start Devonian Test
Mid States Oil company started
Devonian test on the most prom
sing fold on the south or "high"
ide of the fault. This well served
o prove the accuracy of the survey
tut ran into grief at the top of
he Madison lime, losing a string
II tools which cable tool drillers
lave thus far been unable to re- ,
over or sidetrack. The hole now
tands at 1925 feet
Paul Kayser has been present at
he completion of the Zodiac we'll. {
n immediate charge of operations. {
freeman was present for several ,
lays but was called away before ]
he Madison oil was developed !
Iayser stated Thursday that his /
has not decided whether '
o complete the Devonian test, de- {
ision to rest on the outcome OF t
he Zodiac we'll If the Madison
me production is not commercial, {
he Cut Bank sand will next be OPP {
ned by shooting through the lin
r. with nitro glycerin, he states.
hnr - |