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Sept- 24, 1946,
2,407,933 y
'Filed oct. 19, 1942
2 Sheets-Shea?l 1
15 ?
Sept. 24, 1946.
_ 2,407,983
Filed Oct. 19, 1942
2 sheets-sheet 2
/ .u. .0.
Patented Sept. 24, 1946
Orvie D. Harper, Vandalia, Ill., assignor to
Standard Oil Development Company, a cor
poration of Delaware
Application October 19, 1942, Serial No. 462,552
5 Claims. (C1. 166-21.)
The present invention is directed to a method
for completing wells drilled for the production of
petroleum from two or more producing horizons
spaced from each other.
In the past, methods have been developed for
bottom of .the casing shoe is not resting on the
rim of the rat hole, and cement is pumped in in
the usual manner.
After a pre-determined
the production of petroleum from a plurality of
spaced producing horizons by using in the casing
sections of drillable metal known as windows.
It is the principal object of the present invention
to provide a method for accomplishing this same
result without resorting to the use of these ex
pensive and scarce drillable metals.
The nature of the present invention will be best
understood from the following detailed descrip
tion of the accompanying drawings, in which
amount of cement sufficient to i’lll the space be
tween the casing and the bore hole wall ybetween
.the two producing horizons has been pumped
into place, the entire assembly is seated> as shown
in Figure 2 with the bottom of the casing shoe
resting against the upper rim of the rat hole
10 and the prongs imbedded in the producing for
mation I5.
The casing shoe and section 4 when in this
position are not free to turn `so that by turning
the casing to the right the splines 2 are moved
15 over to a position where they may readily be
Figure l is a perspective of the elements used
withdrawn from the J~slots. The string of cas
in one embodiment of the present invention;
ing with section I is then picked up to a point
Figure 2 is a vertical section of these elements
shown above the upper producing horizon and
in position for the ñrst stage of the completion
cementing is resumed until the required amount
method of the present invention;
20 of cement is in place. After the cement is set,
Figure 3 is a similar View of lthe elements in
it and the floats are drilled out of the casing and
position for the second stage of said method; and,
the producing horizons shot with nitroglycerin to
Figure 4 is a similar View, with Ithe elements in
free their surfaces and to increase the amount
position for the next succeeding stage of said
of exposed producing surface. In Figure 4 the
25 parts are shown in the position they assume in
Referring to the drawings in detail, numeral I
the final cementing stage.
designates the lower section of a string of cas
It will be apparent that the procedure hereto
ing, this section being provided at its lower end
fore described can be varied without departing
with diametrically opposed laterally `extending
from the scope of the present invention. One
splines 2. These splines areV adapted to work in 30 variation may involve the location of the casing
J-slots 3 provided in the upper end of a special
float collar in section 4 below section l, rather
section 4, the lower end of which is adapted to
than above it. When lthis is done the assembly
have screw-threaded engagement with a casing
is lowered into the position shown in Figure 2
shoe 5, provided with the conventional iioat 6 for
and the cement is followed by a plug which is
cementíng purposes. The casing shoe is provid 35 pumped down to the float collar. Section I is
ed at its lower end' with downwardly extending
then disengaged from section 4 and the cement
circumferentially spaced prongs 'I which serve
above the iioat collar and above section 4V is
the purpose hereinafter speciñed.
pumped out. 'I'hen with the parts in the position
In Figure 2 is shown a bore hole 8 traversingV
shown in Fig. 4 the hole above the producing ho
two spaced producing sands 9 and Ill. The hole 40 rizon 9 is cemented. By this procedure the
is drilled with the final desired diameter to the
amount of cement to be drilled out of .the casing
top of producing section lil, and into this forma
is reduced and the faces of the producing for
tion is drilled a rat hole II of reduced diameter.
mation are kept free of cement.
The assembly shown in Figure 1 is attached to
It can readily be seen that the aforedescribed
the end of a string of casing I2 with a conven 45 arrangement lend-s itself readily to separate pro
tional ñoat collar I3 having float I4 arranged
duction from the several horizons. With the
between the end of the string of casing and the
parts in the position shown in Fig. 4, for ex
aforedescribed assembly. The length of section
ample, after the cement and the floats have been
4 is determined by the distance between the pro
drilled out of the casing, a tubing can be lowered
ducing sands and the length of section I is op 50 from the surface into section 4 and packed off
in this section with the result that oil from for
With the parts in the relation shown in Figure
mation I0 is produced through the tubing and
2, the assembly is lowered until the prongs 1,
oil from formation 9 produced through the cas
strike the shoulders of the rat hole. The assem~
ing without any mixing of the two. In fact, with
bly is then raised slightly so as to insure that the 55 this latter arrangement, where there is only one
producing horizon such as that indicated by nu
meral I0, the upper part of the casing above 'sec
tion 4 can be omitted entirely thereby cheapen
ing greatly the cost of completing the well`
While the Ainvention has been described with
reference to production from two horizons, its
adaptation to production from more than two
tion and the wall of the bore hole, securing the
lowermost section against rotation, rotating the
upper section with respect to the lowermost sec
tion to separate them, withdrawing the upper sec
tion until its lower end is adjacent the top of the
next higher producing formation, cementing the
upper section in place and drilling out cement
from the interior `of said sections.
3. A method for completinga well having two'
for example'it> is necessary only to have another
pair of sections corresponding> to l and 4 with 10 producing formations at different levels which
comprises drilling a bore hole of the ñnal desired
the bayonet slot connection arranged to be re
diameter to the top of the lower producing forma
leased by rotation in a direction opposite from
tion, drilling a rat hole into said formation, low
that required to release the lowermost connec
ering into the bore hole a casing Vhaving at least
tion. The number of sections which -can be
utilized can be increased by utilizing J-slots re» 15 two sections separable by rotation relative to
each other to a'point where the lowermost sec
quiring different degrees of rotation, as well as
tion terminates adjacent the top of the lower
rotation in different directions, for disengage~
most producing formation but spaced from the
ment of the splines from the slots.
top of said rat hole, forcing cement into the
While the prongs 'l constitute a very desirable
space between the lowermostV sectionV and the
adjunct to the completion assembly described,
wall of the bore hole, seating said lowermost sec
their usel may be dispensed with. In this case
tion on the top ofv said rat hole and securing it
care must be taken that in the first cementing
against rotation, rotating the upper section of
stage only suñicient cement is employed to secure
the casing with respect to the lowermost section
the lower section in place when it is seated on the
rat hole, as shown in Fig. 3, without covering up 27,5 to separate them, withdrawing the upper section
until its lower end is adjacent the top of the
the J-slots because it is necessary to permit the
higher producing formation, cementing the up-~V
cement to pass at least the first setting stage be
persection in place and drilling out cement from
fore section l can be rotated with respect to sec-f
horizons is a simple matter. For a third horizon,
tion 4.
the interior of said sections.
4. The method of cementing casing in a Well
The nature and objects of the present inven 30
having upper and lower producing strata which
tion having been thus described and illustrated,
what is claimed as new and useful and is desired
to be-secured by Letters Patent is:
1. A method for completingA a, well having a
plurality of producing horizons which comprises
lowering into the well a casing having separable
sections corresponding in number to the produc
ing‘horizons into a position where the lowermost
section is just above the ,lowermost producing
horizon, cementing the lowermost section of the ,
casing in place, disengaging the remainder of the ' »
casing from the lowermost section and raising it
comprises discharging cement through the cas
ing> and from adjacent the bottom thereof to ce
ment the bottom of the casing in place between
the strata, separating the casing and lifting that
portion of the casing above the point of separa
tion to expose the upper stratum, and discharg
ing cement through the lifted portion of the cas’
ing adjacent the bottom thereof >to cement the
lifted portion in place above the upper stratum.
5. 1A method for completing, a well traversing
a plurality of producing formations so as to per
until its lower end is’adjacent the upper end of
mit production from at least two _formations
which comprises lowering into the Well a. casing
the next higher producing horizon, cementing the
new lowermost section in place, repeating these 45 having at least two sections separable by rota»`
operations to the extent required by the number
tion relative to each other to a point where lthe
of producing sections and drilling out residual
lowermost section terminates adjacent the top of
cement from the several sections.
the lowermost producingV formation, forcing _ce
2. A method for completing a well traversing
ment into the space between the lowermost sec
a plurality of producing formations so as to per 50 tion and the wall of' the,` borehole, securing" the
mit production from at least two formations
lowermost section against' rotationL rotating; the
which comprises lowering into the well a casing
having at least two sections separable by rota
tion relative to each other to a point where the
lowermost section terminates adjacent the top 55
upper Vsectionwith respect to the lowermost sec-V
tion to separate them, withdrawing the' upper
section until its lower end is adjacent thetop
of the next higherA producing formation, cement
of the lowermost producing formation,> forcing
ingthe-upper section in place.
cement into the space between the lowermostsec
, ’j
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