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Патент USA US3055434

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Sept. Z5, 1962
Filed Nov. 25, 1959
‘11m/L am@
Patented Sept. 25, 1962
cement 16. The cement l1-6 and the steel casing 14 ex
tend a relatively short distance below the surface.
A flexible tubular member 18 preferably made of
Thomas 0. Allen, Tulsa, Ghia., assigner, by mesme assign
ments, to Jersey Production Research Company, Tulsa,
plastic is shown lowered into the borehole 10 with its
lower extremity adjacent the bottom of the borehole.
The length of the flexible tubular member 18 is chosen
Dida., a corporation of Delaware
Filed Nov. 25, 1959, Ser. No. 855,311
2 Claims. (Cl. 16a-21)
so as to extend to the bottom of the borehole and may
be unwound from a reel 20 which may be mounted on
a truck 2.1.
This invention relates to oil and gas wells. More par
ticularly, this invention is a novel oil and gas well lining
or casing and a method for forming this lining or casing.
In the finding and production of oil and gas, the costs
involved are continually increasing. Based on present
To prevent the permanent formation of kinks and
bends in the `flexible tubing 18, an anchoring means may
be employed. A preferred anchoring means is shown in
FIG. 2. An inflatable packer 22 is bonded to a closed
day costs, casing and tubing alone represent 1A of the
packer 22 and when the packer 22 is inflated, the teeth
will bite into the borehole side walls. A spring biased
cost of drilling and completing an oil well. Prospects for
reducing this tremendous expenditure depend on finding
a suitable substitute for steel tubular members, particularly
casing or lining since it represents the major item. Steel is
subject to corrosion. Hence, it is necessary to incur the 20
bottom member 24. Teeth 26' are formed on the inflatable
check valve 28 is formed in a side of the bottom mem
ber 24. Packer 22 is inflated by the application of pump
pressure from the earth’s surface down the tubular mem
ber 18 through check valve 28 and into the packer 22.
The check valve 28 prevents the valve from deflating.
A rupture disk 30 is formed in the member 24 at a point
above the packer 22. Once inflated to the proper pres
sure, fluid circulation can be achieved by applying addi
ject to corrosion.
Briefly described, my invention comprises a flexible 25 tional pressure to rupture the disk 30.
Member 24 is securely connected to the bottom of flexi
tubular member of less diameter than the borehole. A
ble plastic tubing 18 by means such as a clamp mem
cementitious plastic material which has been allowed to
ber 32.
set in the annulus formed by the plastic tubular member
FIG. 3 illustrates a second type of anchoring means
in the borehole in combination with the plastic tubular
member provides an efficient borehole lining or casing. 30 which may be employed. Referring to FIG. 3, the tubu
lar bottom member 34 which is securely clamped to the
lIn forming my new lining, a flexible tubular member
flexible tubular member 18 by clamp 32 has a full opening
of sufficient length to extend to a point adjacent the bot
bottom. A plurality of slits 36 extend upwardly a short
tom of the borehole is first lowered into the borehole.
distance from the bottom of the bottom member 34. A
The cementitious material is then pumped down the flexi
ble tubular member and up the flexible tubular member 35 spring biased latch dog 38 is pivotally connected -within
each of the slits 36 by pivot pins 40. Teeth 4Z are formed
borehole annulus to fill the annulus with the cemen‘titious
on the outer ends of each of the latch dogs 38. These
material. The cementitious material is then allowed to
teeth are shaped to bite into the side wall of the bore
set. The set cementitious material and the Iflexible tubu~
hole upon slight upward movement of the flexible tubu
lar member then comprise the lining of the borehole.
The flexible tubular member may be made of a plastic 40 lar member 18. Springs 44 having one end connected
to the member 34 and the other end Working against the
Imaterial suitable for the purpose. Thus, the use of a
upper inside portion of the latch dog 38 provide the
steel casing is eliminated. The cementitious material may
outward bias.
consist of a low cost cementitious plastic material. This
The flexible tubular member 18 may be properly cen
eliminates the higher cost casing cement currently em
45 tered or spaced within the hole by the provision of a plu
rality of protrusions 46 which can be molded directly into
Tests have shown that plastic squeezed to a minimum
the flexible tubular member 18.
distance of 1” radially from a 4%" borehole in Indiana
In carrying out my new method, the flexible tubular
limestone can withstand external pressures in excess of
member 18 is ñrst lowered into the borehole `10. If the
2,500 p.s.i. These tests further proved that thick-walled,
filled plastic linings in the same 4%" diameter holes 50 anchoring means of FIG. 2 is employed, pump pressure
is applied to inflate the packer 22 against the side walls
were capable of withstanding in excess of 4,000 p.s.i. ex
additional cost involved in corrosion control.
The invention to be described herein provides the art
with a low cost borehole lining casing which is not sub
of the borehole. If the anchoring means of lFIG. 3 is em
ployed, an upward pulling of the flexible tubular mem
ber 1-8 causes the teeth `42 to bite into the side walls of
further understood by reference to the following detailed
description and drawings in which:
55 the borehole and prevent further upward movement.
Further pulling or stretching on the top of the tubular
PIG. l is a schematic View in elevation useful in ex
member 18 employing either anchoring means straightens
plaining the method of forming the lining or casing;
the flexible tubular member thereby removing «bends and
FIG. 2 is an enlarged sectional elevational View show
kinks. The cementitious material is then pumped down
ing a preferred method of anchoring the flexible tubular
member in the borehole;
60 the flexible tubular member 18 and up the annulus formed
by the flexible tubular member and the sides of the bore
FIG. 3 is an enlarged sectional elevational view show
hole to completely flll the annulus. The pressure required
ing an alternative anchoring means;
to cause this flow will squeeze the plastic or other cemen
rFIG. 4 is a view taken along lines 4-"4 of FIG. 3;
titious material into the formations to reinforce the hole
FIG. 5 is a view taken along lines 5»~J5 of lFIG. 3; and
FIG. 6 illustrates a method for tying the upper end 65 wall. `Once the annulus is full, the material can be
allowed to set up. It is obvious that the material in the
of the plastic tubular member to a section of a steel cas
flexible tubular member must be displaced by a fluid which
ing to anchor the casing in the wellhead with the surface
will not set. This can be done by calculating the »require
pipe extending only a few feet below the earth’s surface.
ments for the annulus and displacing it through the flexible
Referring to FIG. l, a borehole 10` is shown formed
from the earth’s surface. The usual wellhead 12 is shown 70 tubular member 18. Any deficiency can be made up
by pumping additional material into the top of the an~
at the entrance to the borehole 10. A steel casing 14 is
cemented to the sides of the borehole by the conventional
ternal collapse pressures.
The invention as well as its many advantages will be
After the plastic cementitious material has been allowed
to set, the new casing or borehole lining is complete. This
lining or casing, as shown in FIG. 6, comprises the plastic
tubular member 18 of less diameter than the borehole and
the set cementitious plastic material 48 in the annulus
formed by the plastic tubular member 18 and the sides
of the borehole.
lFIG. 6 also illustrates a method for tying the upper
end of the plastic or flexible tubular member 18 to a
short section of steel casing, to anchor the casing in the
to a point adjacent the bottom of the borehole; exerting
an upward pull on the flexible tubular member to anchor
said member; and maintaining said pull while pumping
cementitious material down the flexible tubular member
and up the tlexible tubular member-borehole annulus to
ñll said annulus with the cementitious material; and allow
ing the cementitious material to set, thus providing a bore
hole lining.
2. A method of forming a lining in a borehole compris
ing the steps of: taking a llexible tubular member with an
wellhead. The wellhead 12 includes a top flanged mem
anchoring means on the bottom thereof responsive to up
ber 50 provided with a slip fbowl for receiving slip mem
ward movement of the flexible tubular member and hav
ing a length such that when positioned in the borehole,
its lower end will extend to a point adjacent the bottom
bers 52. Slips 52 are provided with teeth or threads 54
for tight engagement with the metal tubular member 56.
The top of the ñexible tubular member 18 is securely 15 of the borehole and its upper end will be located at a
depth substantially less than the depth of the borehole
clamped by clamp 5S to the bottom portion of the metal
and lowering the llexible tubular member into the bore
tubular member 56.
hole until a small portion extends above the wellhead;
The flexible tubular member 18 may be reeled into
then holding the flexible tubular member while attaching
the borehole until the upper portion is about to enter the
borehole. The metal tubular member 56, which may be 20 a metal tubular member to the top of the flexible tubular
member and coaxial therewith; then lowering the llexible
only a few feet in length, is then securely clamped to the
tubular member and attached metal tubular member into
ñexible tubular member 18. The rest of the tubular
position; exerting an upward pull on said tubular mem
member 18 and the attached metal tubular member 56
bers to anchor them; pumping cementitious material down
is then lowered into the borehole and securely anchored.
The cementitious plastic material 48 is then formed in the 25 said members and up the annulus formed by them to
lill said annulus with the cementitious material; and allow
same «manner as formerly described.
ing the cementitious material to Set, thus providing a bore
The ñexible tubular member 18 may be formed of
hole lining.
an epoxy resin or the relatively inexpensive phenol form
Examples of cementitious plastic material
which may be utilized are phenol formaldehyde, epoxy 30
resin, poly styrene resins, acrylic resins, butadiene styrene
copolymer resin, -and others.
References Cited in the ñle of this patent
I claim:
1. A method of forming a lining in a borehole com
prising the steps of: lowering into the borehole a flexi 35 2,092,042
ble tubulal- member having an anchoring means on the
bottom thereof responsive to upward movement of the
lìexible tubular member and of suflìcient length to extend
Bryson ______________ __ Feb. 13,
Duncan et al. ________ __ Aug. 12,
Huber _______________ __ Oct. 25,
Armentrout et al. ______ __ Sept. 7,
Lerch et al. __________ __ May 16, 1944
Britton et al. __________ __ Oct. 5, 1954
D’Audilîret et al _______ __ Apr. 19, 1960
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