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Патент USA US2403631

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July 9, 1946.
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C. B. BROWN
METHOD FOR DETERMINING THE PETROLEUM HYDROCARBON2 403,631 ,
.
CONTENT OF EARTH SAMPLES
Filed July 5, 4 1943
9
Patented July 9, 1946
2,403,631
UNITED ‘STATES PATENT OFFICE‘ f
2,403,631
METHOD FOR DETERMINING THE PETROLE
UM HYDROCARBON CONTENT OF EARTH
SAMPLES
Charles B. Brown, McAllen, Tex.
Application July 5, 1943, Serial No.493,'60.6
3 Claims. (01. 250-833)
1
This invention relates to a method for use in
tion. The ?uorescent light issuing from the
locating oil deposits and oil bearing strata en
countered in wells being drilled for oil and has
portion '01’ the. solvent is passed, through a
spectral :?lter, separated into its spectral compo
nents, the intensity of each of which is deter
more particular reference to an improved method
for accurately analyzing earth samples for the
mined
petroleum hydrocarbon and pseudo-hydrocarbon
content thereof.
_
or
measured . by
any
well,
known
photometric technique suitable for the purpose.
The ?uorescent light issuing from each
'
In the processes of exploration for petroleum
and petroleum bearing strata by analysis of earth
samples for their hydrocarbon content hereto
hydrocarbon in solut'on possesses a spectral dis
tribution individual thereto. The type and
fore employed, considerable di?iculty has arisen 10 concentration of each hydrocarbonof the sample
is determined by comparing the spectral compo
in distinguishing between those hydrocarbons as
nent intensity thereof with the aforesaid
sociated with petroleum deposits and petroleum
bearing strata and those hydrocarbons associated , ,, empirical charts until an empirical chart is found
which possesses the same degree of ?uorescence
with organic phenomona unrelated to petroleum
1
deposits and petroleum bearing strata. 'Attempts 15 as the hydrocarbon being measured.
One of the objects of the invention is to provide
have been made to use the ?uorescent phenom
a new and improved method of separating and
ena observed when hydrocarbons and their solu
tions are subjected to ultraviolet radiation for the ; ' accurately measuring the concentrations of the
various hydrocarbons and pseudo-hydrocarbons
purpose of analysis, but this method has not been
entirely satisfactory because of the interference 20 found in earth samples and of distinguishing
between those hydrocarbons and pseudo
of hydrocarbons not associated with petroleum
hydrocarbons associated with petroleum and
causing false indications. Furthermore, with the
method heretofore employed, the intensity of ' - petroleum bearing strata and those hydrocarbons
?uorescence has been ‘found to be not directly 25 not associated with petroleum. and petroleum
bearing strata. Another object is, to provide a
proportional to the concentration of the various
method of accomplishing the aforesaid object
hydrocarbons in solution and for this reason
rapidly in contradistinction to the relatively slow
such methods do not afford an accurate measure
of the hydrocarbon content of the earth sample. . >
laboratory methods now in general use.
_
v'I'he improved method in accordance with the 30 7 Still other objects and advantages will be
apparent from they following description taken in
present invention eliminates these difficulties by
connection with the sheet of drawing on which is
, preparing a series of standard empirical charts, _
shown in diagrammatic form the various ele
separating each of the fluorescent effects of the
ments and instrumentalities employed with my
various hydrocarbons, and accurately measuring
invention according to a preferred embodiment
the concentration of each hydrocarbon by com-.
thereof.
parison of the separated ?uorescent e?ect thereof 35
Referring now to the drawing for a more
with the empirical charts. The empirical'charts _
complete understanding of the invention, ultra
may be conveniently prepared by using a series
violet rays are radiated from a suitable source I
of known hydrocarbons having known concen
arranged within a hOusing 2 and passing through
My method comprises the following steps: The 40 an opening 3 therein. A ?lter 4 is arranged
within the path of travel of the ultraviolet rays
earth sample to be analyzed is dried to remove
to remove the visible components of the radia
excess moisture and ground to approximately 100
tion whereby only the invisible radiation
mesh ?neness using any well known‘ standard
laboratory technique. A measured quantity of. component passes through the aperture 5 in the
45 shield 6. The intensity of the ultraviolet radia
the sample is placed in a suitable‘vessel and a
tion is controlled by passing it thru the
predetermined quantity of a hydrocarbon solvent
adjustable ultraviolet absorbing wedge shaped
known to be non-?uorescent of itself is added
member 1 having a plurality of graduated cali
thereto. The mixture thus formed comprising
brations 8 thereon. The ultraviolet radiation
the sample and the solvent is allowed to settle
trations.
.
thus controlled in intensity passed through the
and a convenient measured portion of the solvent
is transferred‘to a vessel composed of a material
vessel 9 composed of a material which is trans
parent to the ultraviolet radiation. The vessel 9 v
transparent to ultraviolet radiation. The trans
contains the solvent sample III which is caused
parent vessel containing the measured portion of
a he solvent is subjected to an ultraviolet radia
55
to ?uoresce when subjected to the ultraviolet
radiation at II. The ?uorescent illumination
2,403,631
3
drocarbons of a measured quantity of an earth
sample, subjecting a measured quantity of said
solution to an ultraviolet radiation, passing the
?uorescent light emanating from said solution
from that portion ll of the sample is passed
through a spectral ?lter l2 and falls on a
photocell
13.
The photocell is connected in circuit with a
calibrated meter M, battery B and switch $10.
through a. plurality of spectral ?lters in succes
, sion, each of said ?lters corresponding respective
With the switch Sw moved to the closed position
1y to one of a plurality ‘of different bands of the
spectrum, measuring the intensity of ?uorescent
the intensity of the ?uorescent illumination at
I3 is measured by comparingthe reading of the
light in each one of said spectral bands respec
meter M with a previously determined calibration 10 tively, and in comparing the measured intensity
C of the meter. The spectral ?lter i2 is adapted
of the fluorescent light in each spectral band
with each of a plurality of empirical charts in
to pass a predetermined band thereto and the
succession respectively, each of said charts cor
?uorescent illumination issuing from the solvent
responding to hydrocarbons of different known
sample is thus separated into its spectral com
ponents. A series of these spectral ?lters such 15 concentrations.
2. The method of exploring for subterranean
as the ?lter illustrated are used in succession, a
petroleum deposits which consists in, subject
separate measurement of intensity being obtained
ing a solvent containing the dissolved hydrocar
for each ?lter so employed, the measurements be
bons and pseudo-hydrocarbons of a measured
ing performed in consecutive order until the en
tire spectral band has been measured and an 20 quantity of an earth sample to an ultraviolet
intensity reading obtained for each portion of
radiation of controlled intensity, passing the ?u
the band. The standard empirical charts em
'orescent light emanating from the solvent
ployed with‘the present invention are prepared
by performing this measuring operation with
through a
sion, each
known hydrocarbons of different known concen 25 tively to a
intensities
trations and plotting the results as a family of
plurality of spectral ?lters in succes
of said ?lters corresponding respec
different spectral band, measuring the
of ultraviolet radiation required to
intensity curves corresponding respectively to dif
produce apredetermined intensity of ?uorescent
ferent spectral bands.
light in each spectral band respectively, and in
‘comparing the measured ultraviolet intensities
.
In analysing an earth sample containing an
unknown hydrocarbon in accordance with the 30 with each of’ a plurality of empirical charts re
spectively corresponding to hydrocarbons of dif
method of the present invention, the solution
containing the unknown hydrocarbon is placed
ferent known concentrations.
_
3. The method of determining the presence of
in the vessel 9 and subjected to a predetermined
intensity of ultraviolet radiation by adjusting the
a petroleum bearing strata in a well being drilled
ultraviolet ray absorbing wedge member 1 such
for oil which consists in, mixing a. measured
35
that a predetermined one of the calibrations a
amount of earth sample from the bore hole with
is opposite the point of reference M. The in
a predetermined quantity of a non-fluorescent
tensity of each of the spectral bands issuing from
solvent; subjecting a predetermined fractional
the sample is measured by comparing the read
portion of said solvent to an ultraviolet radia
ings of the meter M with respect to the calibra
tion, passing the fluorescent light emanating
40
tion C thereof corresponding respectively to each
from the solvent'through a plurality of spectral
of the spectral ?lters employed in succession dur
?lters in succession, each of said ?lters corre
ing the measuring operation. These measured
sponding to a different spectral band respec
intensities are now compared with the aforesaid
tively, measuring the intensity of the ?uorescent
‘empirical charts and the type and hydrocarbon 45 light in each spectral band, and in comparing
‘content of the sample determined in accordance
each of the measured intensities of the fluores
with the results of this comparison.
What I claim as new and desire to be secured
by Letters Patent of the United States is:
1. The method of exploring for subterranean
petroleum deposits which consists in, preparing 50
a solution containing a plurality of dissolved hy- -'
cent light with a plurality of empirical charts
respectively corresponding to hydrocarbons of
known concentrations.
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' CHARLES B; BROWN.
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