Montana oil and mining journal. [volume] (Great Falls, Mont.) 1931-1953, 1936-10-31

0pcn flow potential before acldlEing, only
fNi.00O.OUO cubic feet Of gas could have
creased production due TO acidizing over
this period Il lOi .OO0.0O0 cubic feet. which
az an assumed value Of five cents per
thousand cubic feet Is worth $500.
The, average cost OF treatment WAS SEQ.
Ter we'll. Therefore increased net in
tonne In 100 days was s4.700 per well.
OIL WELL INCREASES
Al the present there are more treat
mcnts made for the sole purpose OF secur-
ing greater oil production or potential
than for varying the gasfoil or water oil
Graph d shows the result obtained by
acidizing an oil well Ia Pondera. Mont
BY a single acid treatment, this old
barrels Of oil over and above the normal
oil production for the period represented
By the graph
covered from a single acid treatment OF
an oil n barrel well producing from
the Madison dOlOmitic lime Of Pondera,
si4o barrels u oil above the normal 2nsi
2ia barrels for the same period. II Is
safe to assume that this well will pro
duce an additional 1900 barrels before
the production reaches the old decline
Graph II Is from the Seminole pool.
This acid-treated vel made an excellent
response to treatment. During one years
the two being responsible Tor the recOy
cry OF 1850 barrels OF oil In this time.
This graph illustrates that successive
treatments are profitable
OPTIMUM WELL SPACING
Not long ago Il was thought that high
well density and high production rate
were necessary 70 secure the greatest Ill
innate recovery from a pool
Many papers have been written by COM
petent engineers on the optimum well
spacing problem. Most or these writer's
are convinced that low we'll density viii
assure greater ultimate recovery because
OF better utilization OF the energy
within the reservoir. II the gas and gas
pressure are not sufficient to produce
OK the cOnfiding water, II properly con-
tr0lled, can be utilized TO move the oil
through the formation 20 the we'll and
In many cases 10 the suTfacs.
This paper does not propose a certain
type OF well spacing program. Such a
program must he developed for individual
fields after the charscteristies Of tbs
pool are learned Some OF the character
istics to be considered are the thickness
OF the producing formation, porOsity, |
permeability and reservoir pressure.
Acidizing-c can have no effect on either
the thickness Of the producing formation |
nor the reservoir pressure but IL can |
affect the porOsity and permeability. |
Therefore. the relationship between /
proper acidizina pOrosity and optimum /
well spacing is already a matter Of |
present concern. The opinion was ad- Il
ranced before the New Mexico State OIL /
Commission. In the hearing i
previously mentioned. that forty acre /
spacing would be more economical than i
ten acre spacing. Operators in Michigan L
are now developing a 20-acre well spac-
Ing program instead Of the usual 10
acre plan. Opinions differ rs 10 the
Of these programs but re-
results are being watched closely because
II the tremendous possibilities.
II all the above benefits which can be
derived from scientific acidizing are
considered In the light OF economic oil
production, II Will be clearly obvious
hat the process has an inestimable
-alne for the oil producer.
The cost 20 the user OF the Acidizlng