Montana oil and mining journal. [volume] (Great Falls, Mont.) 1931-1953, 1937-03-13
MICROBES REERIEND


Continued from Page onel
the way down the tubing or after
Il has reached the bottom Of the
hole.
This jelly has some unique and re-
markable properties that make It
particularly adaptable to certain
we'll treatments. It gathers the wa
ter, with which it Is mixed, into
large, slow moving particles which
enter the formation only under in
ordinate pressure.
For example, a flow tube packed
with fine sand to give a perma-
some other permeable sandstone is
penetrated only ga of an inch un-
der a pressure differential of 1851
pounds per square inch. This pres
sure dffferential is more than is
needed in practically any CONNER
cial treatment to obtain the desired
control OF the acid. Little or no
pressure is necessary to start flow
from within a sand that Is sealed
with Jelly, as Is demonstrated by
in the reverse direction In this |
Jelly sheath.
Added precautions have also been
made to secure complete removal OF
seal from the face of the formation.
Since the seal is an organic mater
ial. it is mnOculated with bacteria
which decompose the Jelly after
controlled interval of time. The
type of bacteria used is a common
and harmless variety which can be
easily prOpogated at the treating
station in the field, and is one which
will be effective at temperatures
existing at the bottom of the hole.
The Jelly may also be lquified by
the addition of certain chemical a
gents. The Ceiling time, as well as
the specific gravity, is subject to
control by methods and quantities
used in mixing as well as by the
addition of other chemical agents.
The pamphlet gives several ex-
amples of the use of Jelly Seal,
One of which was a Russell county,
Kansas, we'll which was producing
rs barrels of oil daily from twoI
pays in the Topeka lime was aci- {
iized in a conventional manner
With no results. A study Of the sec
ion revealed that in all probable {
ty the solvent all went into the I
over pay which was producing APP e
fortunately 65 per cent of the total G
Ill Before the second treatment the
'ottom pay was blocked off with Il
ely Seal. After this treatment the
rell produced $50 barrels OF oil
rom the upper pay.
This material has also been sue
essfully used to obtain more de- II
mite control of the acid in treat :.
lg for oil-water ratio. The use of -
Ally win allow the introduction OF ~
cid into only the upper part of =,
lie formation and it will increase ~,
lie oil and not the water and thettn
wer production will come back as -,
70 jell disappears.
A we'll in the Polo Field of Logan of
1unty, Oklahoma, producing from To-
e Viola, Simpson and Wilcox for~I a
was given the first Jelly 10
al treatment made in the Mid be
'ntinent area. This well was pro- sill
cling oil from the Viola, Simpson on
d Wilcox formations. 1t had an VIII
tial production of eight barrels pre-
r hour from the Viola, five barrels
+ hOur from the 1SmpSOn and 140 int
rrels per hour from the Wilcox, sio
had since declined to a total pos
of 40 barrels per hour pri
the time Of the treatment. fro
,i,oo 49, vu,,oo,. -. - - ; the
remedy peTmeable on the basis
the above initial production rates, cum
was probable that all the acid and
uld have gone into the Wilcox rec
h no resulting increase in pro- Cor
,tion. Therefore, the entire 81 OF
of Wilcox were blocked off I
h Jelly Seal, and the we'll was an
n treated with $500 gallons of on
veil x. ado
IN 24-hour test following treat vi M
1T. the we'll flowed 7OO.75 bar witt
during the last four hours of this
4-hour test, an average Of 1879
rels per hour. The success of this N9 gI
tment can be attributed to the
lting technique since nearby
Is treated in a conveniaI manner NC
ed to respond. sign,
the