Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.
CA 02908981 2015-10-20
A Rotatable Liner Hanger with Embedded Slip of Multiple Cones
Technical Field
The invention refers to oil cementing tool's field, especially refers to A
Rotatable Liner
Hanger with Embedded Slip of Multiple Cones.
Background technology
At present, in domestic, the regular liner hanger technology is already mature
relatively.
But, as the technology updates and special oil and gas reservoirs development
needs, such as
gas storage, the requirements of liner's and the top packer's technology are
higher and higher.
A few domestic companies and oilfield begin to study rotating technology, but
little in the
practical applications. Design ideas of the rotating liner is making liner
tools rotate when the
liners are run into the well or cementing is operated, and the liner tools can
absorb a certain
amount of torque, which can make sure that cement tools run into the well
smoothly and
improve the cementing quality. At the same time, there are much higher
requirements for
liner related tools, such as the liner hanger and the top packer. Two big
problems exist in the
application of the rotating liner hanger: one is that the bearing capacity is
insufficient and
stability is poor in deep well or ultra-deep well cementing performance;
another is that the
load way of conical surfaces of slip's inner and the cone's outer increases
stress value of slip,
cone and outer casing, which restricts the hanger's reliability in complex
wells, such as
horizontal well, extended reach well, etc.
So a new rotatable liner hanger needs to be invented.
Summary of Invention
The purpose of this invention is to design A Rotatable Liner Hanger with
Embedded Slip
of Multiple Cones for solving the problem of present technology and achieving
the ability of
setting and rotating, meanwhile it has great capacity of hanging load,
protecting the slip and
the upper casing, preventing slip setting in advance, and other functions. So
the hanger's
reliability in complex wells, e.g. horizontal well and extended reach well,
can be improved.
This invention's purpose and solution for technology problem are achieved by
following
technology proposal.
A rotatable liner hanger with embedded slip of multiple cones includes: the
liner hanger
contains Body (1), Lock Ring (2), Adjusting Gauge Ring (3), Bearing End Face
Ring (4),
Bearing Protection Ring (5), Adjusting Ring (6), Cone(7), Slip (8), C-ring
(9), Connector
Ring (10), Dog (11), Cylinder Top Ring (12), Cylinder (13), Key Screws (16),
Shear Screws
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(17), and Gauge Ring (18).
There are six pieces of Slips (8) in Cone (7), and each slip's back side
contains two
Inclined Surfaces (19), and the slips distributed in circumferential direction
uniformly. Each
column contains two Conical Grooves that have rectangular hole throughout the
Cone (7).
The two Sides (19) of Conical Grooves are inclined surfaces. The end face of
Cone(7) have
six uniform distribution Trapezoid Grooves (24). The OD of embedded Slip (8)
is smaller
than that of Cone (7) and the slips hide in cone before setting. The two
inclined surfaces (20)
of Slip (8) are clearance fit with the two Sides (19) of cone (7). The cone
(7) and slips (8) is
connected with inverted cone track on the inclined surfaces (19) (20) of the
cone and slips.
After setting, the channel between Slip (8) and Cone (7) and the Trapezoid
Grooves (24) are
ways for flowing of cementing slurry.
Slip (8) connects directly with Connector Ring (10).
Cone (7) and Body (1) are clearance fit, and Cone (7) can rotate around the
Body (1).
Slide bearing contains two Bearing End Face Rings (4), one Bearing Protection
Ring (5)
and four seal rings (23).
The top of Body (1) connects the top packer and running tool, and the bottom
connects
the liner.
The rotatable liner hanger with embedded slip of multiple cones, wherein: the
two
Inclined Surfaces (20) of Slip (8) are clearance fit with the two Inclined
Surfaces (19) of cone
(7), and the inverted cone track (22) of the slips (8) are clearance fit with
the inverted cone
track (21) of the cone (7).
The rotatable liner hanger with embedded slip of multiple cones, wherein:
included
angle between the Inclined Surfaces (20) and axis of Slip (8) and the angle
between the
inverted cone track (22) of the slips (8) and axis of Slip (8), another
between the two Sides
(19) of Conical Grooves and axis of Cone (7) and the angle between the
inverted cone track
(21) of the cone (7) and axis of cone (7) are same size and have a same slide
angle with that
between Slip (8) and Cone (7); and the Slip (8), Cone (7) and Body (1) are
same axial.
The rotatable liner hanger with embedded slip of multiple cones, wherein: the
heavy-duty Bearing is designed by slide lubricant and contains two Bearing End
Face Rings
(4) and one Bearing Protection Ring (5) and four seal rings (23), which makes
sure that can
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rotate under overload.
The rotatable liner hanger with embedded slip of multiple cones, wherein: the
two seal
ring between Bearing End Face Ring (4) and Bearing Protection Ring (5) and the
tow seal
ring between Bearing End Face Ring (4) and the body (1) compose the sealing
system of the
heavy-duty Bearing, and the sealing design of the heavy-duty bearing ensured
the sealing
when rotate;
The rotatable liner hanger with embedded slip of multiple cones, wherein:
there are six
slips installed on Cone (7) that can share the load on every piece of slip and
reduce damage
for the upper casings furthest.
The rotatable liner hanger with embedded slip of multiple cones, wherein:
there is a
C-ring (9) between Cone (7) and Body (1), and the Cone (7) and Body (1) can
rotate
relatively.
The rotatable liner hanger with embedded slip of multiple cones, wherein:
there are
some Dogs (11) between Connector Ring (10) and Cylinder Top Ring (12); when
Cylinder
(13) drives the Cylinder Top Ring (12), Dogs (11) will contract to inner of
the Cylinder Top
Ring (12); and Connector Ring (10) and Body (1) can rotate relatively.
The rotatable liner hanger with embedded slip of multiple cones, wherein:
there are two
Key Screws (16) and some Shear Screws (17) which can fix the Cylinder (13) on
the Gauge
Ring (18).
The rotatable liner hanger with embedded slip of multiple cones, wherein: the
Gauge
Ring (18) is fixed on body (1) by Lock Ring (25), and the OD of the Gauge Ring
(18) is
maximum one of the liner hanger.
Comparing with present technology, this invention of a rotatable liner hanger
with
embedded slip of multiple cones has the following advantages at least:
(1) The Cone is separated with Body in order to rotate after setting.
(2) The heavy-duty Bearing is designed by slide lubricant, which makes sure
that can
rotate under overload.
(3) The sealing design of the heavy-duty bearing ensures the sealing when
rotate.
(4) The embedded slips and cone is connected with inverted cone track on the
inclined
surface, which can protect the slip from scraping;
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(5) The OD of embedded slip is smaller than that of cone and the slips hide in
cone
before setting, which can protect slips from collisions in the process of
running in the
wellbore; taper and gap between slip and cone are confirmed by experiment and
different
processing technology; every slip's side contains two Inclined surfaces, which
makes sure the
effect of setting; there are six slips that implement hanging reliably and
setting steadily and
reduce damage for the upper casings furthest.
(6) Active key type structure is designed for preventing slip form setting in
advance.
The above specification is only an overview of the present invention, in order
to be able
to more clearly understand the technical means of the present invention and
can carry out in
accordance with the specification, the contents of the following are better
implementation
examples of the present invention and has appended drawings.
Brief Description of Drawings
Fig.1 is a quarter-sectional view of A Rotatable Liner Hanger With Embedded
Slip of
Multiple Cones;
Fig.2 is a partial view in an expander window of the cooperate between slips
and cone;
Fig.3 is a partial view in cross-section take along line A-A of Fig.1;
Fig.4 is a partial view in an expander window of the heavy-duty bearing.
Detailed Description of Embodiments
For technical means and effect to achieve the expected objective of invention
are further
elaborated, by using of the appended drawings and a better implementation
example, specific
implementation methods, structures, characteristics and effect of A rotatable
liner hanger with
embedded slip of multiple cones produced according to this invention are
described, details
as following. In following instruction, "one implementation example" or
"implementation
examples" are not necessarily the same example. Besides, one or more cases of
specific
characteristics, structures, or feature can be made of any suitable form
combination.
As shown in Figure 1, a rotatable liner hanger with embedded slip of multiple
cones
includes: the liner hanger contains Body (1), Lock Ring (2), Adjusting Gauge
Ring (3),
Bearing End Face Ring (4), Bearing Protection Ring (5), Adjusting Ring (6),
Cone(7), Slip
(8), C-ring (9), Connector Ring (10), Dog (11), Cylinder Top Ring (12),
Cylinder (13), Key
Screws (16), Shear Screws (17), and Gauge Ring (18).
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The top of Body (1) connects the top packer and running tool and the bottom
connects
the liner, which owns good bearing capacity, torsional and sealing ability.
Other parts are
installed on the Body (1). And there are six slips (8) in the Cone (7), which
can share the load
on every piece of slip and reduce damage for the upper casings furthest. As
shown in figure 2,
every slip's back side contains two Inclined Surfaces (20), and there is an
angle between the
two Inclined Surfaces (20) and axis of cone (7). There are six pieces of Slips
(8) in Cone (7),
and the slips distributed in circumferential direction uniformly. Each column
contains two
Conical Grooves (18) that have rectangular hole throughout the Cone (7). The
front Side (19)
of Conical Grooves is inclined surfaces that play a slide guiding role. And
there is a certain
included angle between trajectory direction and the Cone (7). As shown in
figure 3, there is
an inverted cone track on the inclined surfaces (19) (20) of the cone and
slips. The cone (7)
and slips (8) is connected with inverted cone track whose angle is same to the
angle of the
inclined surface(19). As shown in figure 2, in installing, two inclined
Surfaces (20) of the slip
are attached closely to the surface of the cone (7). The inverted cone track
(21) of the cone (7)
are clearance fit with the inverted cone track (22) of the slips (8). The
angle between the
Inclined Surfaces (20) and axis of Slip (8) and the angle between the inverted
cone track (22)
of the slips (8) and axis of Slip (8), another between the two Sides (19) of
Conical Grooves
and axis of Cone (7) and the angle between the inverted cone track (21) of the
cone (7) and
axis of cone (7) are same size and have a same slide angle with that between
Slip (8) and
Cone (7).
Before setting, the Slips (8) hide in thc Cone (7), two Inclined Surfaces (20)
are attached
closely to the two Sides (19) of Conical Grooves, and the inverted cone track
(21) of the cone
(7) are clearance fit with the inverted cone track (22) of the slips (8).
After setting, there is a channel between the slips (8) and Cone (7), and the
slips (8)
connect directly with Connector Ring (10); and there are Dogs (11) between
Connector Ring
(10) and Cylinder Top Ring (12). When Cylinder (13) drives the Cylinder Top
Ring (12),
Dogs (11) will shrink inner of the Cylinder Top Ring (12). Only when cylinder
(13) moves,
can the setting function of Dogs (11) in advance disable, and the liner hanger
set. This will
further improve the reliability of the hanger. Connector Ring (10) and Body
(1) can rotate
relatively.
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There are two Key Screws (16) that prevent the relative motion of the Cylinder
(13) and
Body (1) and limit the Cylinder's (13) axial motion. There are some Shear
Screws (17) under
Key Screws (16) and the Cylinder (13) is fixed on the Gauge Ring (18) by the
Shear Screws
(17). After the Shear Screws (17) are sheared, the Cylinder (13) will move up
along the Body
(1) by following Key Screws (16).
A Gauge Ring (18) is installed on the Body under the Cylinder (13) and fixed
on the
Body by Lock Ring (25). The Gauge Ring (18) with Body (1) can't rotate
relatively. And the
OD of the Gauge Ring (18) is maximum one of the liner hanger.
As shown in figure 4, two Bearing End Face Rings (4) and one Bearing
Protection Ring
(5) and four seal rings (23) are installed on the Body (1) over the Cone (7),
and the
heavy-duty Bearing is designed by slide lubricant, which makes sure that can
rotate under
overload. Sealing design of the heavy-duty bearing ensured the sealing when
rotate.
The design of the Slips (8) and the Cone (7) discards the design that load is
achieved by
single sliding cone cooperation of the slip's interior conical surface and the
cone's exterior
conical surface. The design of inverted cone track on the inclined surface can
hide the Slip (8)
in the Cone (7) all the time, so that can prevent the Slips (8) from scratches
and broken.
Besides, there are six slips (8) in the Cone (7), which can share the load on
every piece of slip
and reduce damage for the upper casings furthest.
This liner hanger is set by hydraulic pressure. When the liquid pressure in
the body after
reaching a certain value, the Shear Screws (15) will be sheared and the
Cylinder (13) and
Cylinder Top Ring (12) will be ascended together, pushing the Connector Ring
(10) and the
Slips (8) up. While the Slip (8) is upward, it will expand outward and set on
the outer casing.
After setting, the Slips (8) will pass the force of whole liner to the Cone
(7), and then pass to
bearing which is contained by two Bearing End Face Rings (4) and one Bearing
Protection
Ring (5) through the Adjusting Ring (6) (the above four components are
installed on the
Body (1), to realize the load transfer rely on end face contact). The heavy-
duty and low
torque bearing is not only can withstand high load, and reduce the rotational
torque.
When rotating at the process of cementing, the Body (1), the Cylinder Top Ring
(12) and
the Cylinder (13) and so on are rotating with the liner, while the Cone (7)
and the Slips (8)
are stopped. After setting, the channel between Slip (8) and Cone (7) and the
Trapezoid
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Grooves (24) provide ways for flowing of cementing slurry.
In order to prevent slip from setting in advance, active key type structure is
designed.
The Dogs (11) can prevent slip form setting in advance. When the Cylinder (13)
doesn't
move, there are external forces on the Slips (8), setting in advance will not
happen. If only the
Cylinder (13) doesn't move, Dogs (11) will not shrink inner of the Cylinder
Top Ring (12),
and the slips can't be upward with Connector Ring (10) and set.
What has been discussed above is only a better implementation example rather
than
make restrictions in any form of the invention. According to the technical
essence of the
invention, any simple changes to the above example, equivalent change and
modification,
still belongs to the technical solution of this invention.
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