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Патент USA US3057417

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Oct- 9, 1962
s. L. GRIFFITTS
3,057,408
MULTIPLE UNIT WELL SEAL
Filed Oct. 29, 1959
Fig-l 1
Fig. 2
Samuel L. Griff/‘ifs
1N VENTOR.
United States
atent
K6
3,5574%
Patented Oct. 9, 1962
2
1
it reaches a productive formation 18 from which ?uids
are to be recovered. The upper portion of the well bore
3,057,408
is shown provided with the usual surface casing 20 within
MULTIPLE UNIT WELL SEAL
Samuel L. Gri?itts. Rte. 6, Maryville. Tenn.
Filed Oct. 29, 1959, Ser. No. 849,579
7 Ciarms. (Cl. 166—202)
which is received an inner casing 22. It is desirable
to seal this casing within the well bore in order to sepa
rate the productive zone 18 in the well bore from possible
contamination by or the in?ow of ?uids from some of
the upper strata or zones of the formation.
This invention comprises a novel and useful well cas
When it is desired to seal an inner casing to the wall
larly relates to a de .ice for sealing off the space between IO of a bore at a selected location a well casing packer in
accordance with this invention is secured to the lower
the casing and a wall of a well bore.
end of the casing string 22 for movement therewith.
The primary purpose of this invention is to provide
This packer assembly, designated generally by the nu
a packer capable of effectively sealing the space between
meral 30, includes a mandrel 32 preferably composed of
a casing and a well bore wall in order to prevent com
munication between the spaces above and below the 15 a section of casing 22 which is adapted at its upper end
to be secured to the end of the casing string as by weld
packer.
ing at 34, by screw-threaded joint or any other suitable
A further object of the invention is to provide a device
manner, The mandrel 32 is of any desired length, and
whereby surface water and upper muddy streams may
its lower edge is provided with an internal beveled sur
be more easily and effectively sealed from and prevented
face 36 to facilitate the removal of tools from the well
from coming into contact with and contaminating the
bore from below the casing string.
water, oil or other ?uid being produced from a well bore.
Secured to the exterior surface of the mandrel 32 in
A further object of the invention is to provide a device
any desired manner is a sleeve 40 of a resilient deformable
in accordance with the foregoing objects which will effec
material possessing the characteristics of being [resistant
tively seal off mud, sand or gravel which may lie above
ing packer or doirb\l: locking well seal and more particu
the water or ?uid to be produced from a well bore.
25 to and not affected by minerals, chemicals or other ele
ments normally found in the ground including water, gas
or oil, and for this purpose may conveniently be of a
A further object of the invention is to provide a pack
ing device which will make it possible by preventing the
number of plastic materials, compounded rubber, either
in?ow of liquids to ?nish drilling the well bore with
natural or synthetic, or, any other ?exible material suit
smaller diameter tools when it is found to be impractical
or impossible to pull out the ?rst casing and ream the 30 able for the purpose intended.
In accordance with the principles of this invention the
packer sleeve is of a particular con?guration to be now
described. A plurality of annular ribs or ?anges project
laterally from the sleeve and are integral therewith, these
well.
A further and more speci?c object of the invention
is to provide an improved well packer which shall con
sist of a single integral sleeve of a deformable material.
Yet another object of the invention is to provide a 35 ribs being in longitudinally spaced relation. The ribs
are of two different diameters, there being diametrically
well packer in accordance with the foregoing objects in
larger ribs 42 above each of which is disposed diametri
which a one-piece sleeve of deformable material shall be
cally smaller ribs 44. The ribs are preferably disposed
so proportioned as to provide an improved ?uid-tight
in longitudinally spaced sets, each set consisting of a
seal of exceptionally great strength and endurance.
large packer rib 42 and a smaller reinforcing rib 44. At
These together with other objects and advantages
this point it should be noted that the packer ribs will be
which will become subsequently apparent reside in the
of such size that the same will engage the wall of a well
details of construction and operation as more fully here
bore into which the packer device is inserted and be de
inafter described and claimed, reference being had to the
formed and bent over the adjacent reinforcing ribs as
accompanying drawings forming a part hereof, wherein
like numerals refer to like parts throughout, and in which: 45 shown in FIGURE 1.
For this purpose, it is preferred to space the reinforc
FIGURE 1 is a view in vertical section of a fragment
ing ribs unevenly from the two adjacent packer ribs.
of a well bore having a ?rst casing section therein and
Thus the distance A between each packer rib 42 and the
showing an inner casing with the packer device of the
present invention applied thereto in operative position;
FIGURE 2 is a view in elevation, parts being broken
away and showing in vertical section a portion of the
inner casing of FIGURE 2 with the packer element there
on; and
FIGURE 3 is a view in horizontal section taken sub
stantially upon the plane indicated by section line 3-—3
reinforcing rib 44 immediately adjacent thereabove is less
50 than the distance B between the reinforcing rib and the
packer rib 42 immediately adjacent thereabove.
Further, each reinforcing rib 44 is convex in shape,
while in contrast with this, each of the packer ribs has
?at angular top and bottom surfaces.
55
of FIGURE 2.
are of such length and the spaces A and B are so propor
tioned that when the device is inserted in a well bore as
The need frequently arises in the drilling of wells
whether for water or deeper wells for petroleum or gas
for a means to seal or pack off the casing from the well
bore and thus separate the space below the packing such
shown in FIGURE 1, each of the packer ribs 42 will be
60 folded over and bent upwardly over the adjacent rein
forcing rib 44. The reinforcing ribs will thus strengthen
and stiffen the packer ribs and hold them into tight resili
as a productive zone from contamination by ?uids and
materials from thereabove. The present invention is
concerned with the provision of a packer construction
adapted for use when such a requirement arises whereby
Preferably, the ribs 42 are about % of an inch in
thickness as measured longitudinally of the sleeve, and
ent engagement with the walls of the well bore in order
to establish a ?uid-tight seal therebetween. This seal is
65
easily removed if such action is subsequently desirable.
established by merely pushing the packer device down
wardly in the well bore by lowering therein a casing
string 22 to which the packer assembly is attached. How
as at 14, a porous or broken formation as at 16 until
permit the packer ribs 42 to fold downwardly into the
the establishing of a seal between a casing and a well
bore may be facilitated, and whereby the seal may be
ever, owning to the greater space B as compared to the
Referring ?rst to FIGURE 1 it will be observed that a
well bore 10 penetrates from the surface into a forma 70 space A, when it is desired to remove the casing string
22 from the well bore, there is ample space provided to
tion, passing through loose earth as at 12, a rock stratum
3,057,408
space and thus disengage from the well bore as illustrated
in dotted lines in the upper portion of FIGURE 2.
Obviously, the packer device can be formed in any
desired size and any desired length. Inasmuch as the
packer element, consisting of the sleeve 40‘ with the longi
>tudinally spaced sets of longitudinally spaced packer and
reinforcing ribs 42, and 44 is of integral construction, it
5. The combination of claim 1 wherein each of said
packer ribs in longitudinal section have a ?at substan
tially radially extending side surface and said reinforc
ing ribs in longitudinal section each have a convex radi
ally outer surface which engages the ?at side surface
of an adjacent packer rib when the packer rib-s are de
formed in packing position.
may be readily replaced in the well bore, when desired.
6. A packer for well casings comprising a hollow rigid
The foregoing is considered as illustrative only of the
member adapted to be secured to a well casing string and
principles of the invention. Further, since numerous 10 a hollow sleeve of resiliently ‘deformable material tele- .
modi?cations and changes will readily occur to those
scopically receiving and embracing the hollow rigid mem
skilled in the art, it is not desired to limit the invention
to the exact construction and operation shown and de
ber, said sleeve having a plurality of longitudinally spaced
packer ribs and reinforcing ribs extending around its
scribed, and accordingly all suitable modi?cations and
periphery and projecting radially outward therefrom, the
equivalents may be resorted to, falling within the scope 15 reinforcing ribs being of smaller diameter than said pack
of the invention as claimed.
What is claimed as new is as follows:
1. A well casing packer comprising a hollow mandrel
ing ribs, each pair of packing ribsk‘having a reinforc
ing rib spaced therebetween, a peripheral‘sgroove formed
between each packer rib and an adjacent reinforcing rib
adapted for securement to a casing string and a sleeve
whereby each of said packer ribs may be fol‘de over
of a resiliently deformable material receiving and em~ 20 and be compressed between the walls of a well bore\an
bracing the exterior of said mandrel, said sleeve having
the outer surface of one of said reinforcing ribs.
""\
a plurality of sets of longitudinally spaced, radially pro
7. The structure as de?ned in claim 6 wherein the
jecting packer and reinforcing ribs, said packer ribs be
ing of su?‘iciently greater diameter than said reinforcing
ribs whereby each of said packer ribs may be folded 25
over and into engagement with an adjacent reinforcing
rib and in tight engagement with the wall of a well bore
into which said packer is inserted.
2. The combination of claim 1 wherein the longitu—
dinal spaces between a reinforcing rib and the two ad 30
jacent packer ribs is unequal.
3. The combination of claim 1 wherein each reinforc
ing rib is in closer relation to the packer rib adjacent
therebeneath than to the packer rib adjacent thereabove.
4. The combination of claim 1 wherein the opposite 35
ends of said sleeve terminate longitudinally inwardly of
the adjacent ends of said mandrel.
reinforcing rib directly above each packer rib is spaced
less therefrom than the reinforcing rib directly below.
References Cited in the ?le of this patent
UNITED STATES PATENTS
1,771,556
Cox _______________ .._ July 29, 1930
1,924,020
Bihet _.._. ____________ __ Aug. 22, 1933
2,032,492
2,451,070
2,452,466
2,813,589
Nathan _____________ __ Mar. 3,
Chamberlain _________ __ Oct. 12,
Iaswell ______________ __ Oct. 26,
Woodru? ___________ .__ Nov. 19,
1936
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1948
1957
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