SOS MCCTLF Presentationx - Scana Industrier ASA

measlyincompetentUrban and Civil

Nov 29, 2013 (3 years and 6 months ago)

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Introduction


Recently

the

industry

has

had

to

moved

from

having

traditional

derrick

mounted

drill

string

compensators

to

utilizing

active

drawworks
.

This

stems

from

the

need

to

increase

both

the

Variable

Deck

Load

and

the

stability

of

deep

water

drilling

rigs
.

Unfortunately,

drill

line

compensation

units

present

drawbacks

when

used

for

Drill

Stem

Testing

type

operations

as

their

failure

mode

can

create

scenarios

that

either

lock

up

the

compensating

ability

or

instruct

the

drawworks

to

lift

the

string

that

is

in

support

or

as

per

other

failure

modes
.




Due

to

operational

requirements

pertaining

to

movement

of

the

travelling/crown

blocks,

which

in

the

case

of

DST

work

can

occur

during

critical

operations,

a

drill

line

fatigue

limit

may

initiate

a

shut

down

of

operations

until

the

drill

line

can

be

slipped
.



The

solution

for

such

a

scenario

is

to

utilize

a

Coil

Tubing

Lift

Frame

with

Motion

Compensation

capabilities
.

The

following

is

a

culmination

from

years

of

experience

installing,

interfacing,

designing,

and

troubleshooting

motion

compensating

systems

in

both

drilling

and

coil

tubing

applications
.




Introduction Cont’d…

Stingray Scana MoComp CTLF


Estimated Weights


MCCTLF Unit:






500/350
-
124,000 lbs [56,245 kg] Carbon steel





500/350
-
100,000 lbs [45,359 kg] Alloy steel





750/500
-

186,000 lbs [84,368 kg] Carbon steel





750/500
-

125,000 lbs [56,700 kg] Alloy steel



Stroke:


20 ft (All systems)




Power Vessel Storage Rack:





350 MC
-

35,000 lbs Est. [15,875 kg]





500 MC


52,500 lbs Est. [23,814 kg]



Associated Hoses, Manifolds, etc.:






5,000 lbs [2,300 kg]



Stingray
750/500

ton MoComp Coil Tubing

Lift Frame Specifications


Maximum Lift (locked position):

750 tons


Maximum Compensating Load:

500 tons


Compensating Stroke:


20 ft


Blind End


Maximum Working Pressure:

2,400 psi


Typical Operating Pressure:

2,230 psi


Rod End


Maximum Working Pressure:

95 psi


Typical Operating Pressure:

40 psi


Number of 1,000 gal APVs:


2 for operations


Design Specifications:


DNV


OS


E101






in accordance with API 8C






Operational Philosophy



Manufactures of rig motion compensation systems have
advised their customers that active
drawworks

is not suitable
for DST work and should not be used for this application; and
that some other form of compensation be used. Because of
this Stingray has developed a passive system using our years
of experience and years of field proven reliability with existing
passive systems.



Under normal circumstances, we could expect to use a
simple rod end down design for this application. But the
increased severity of the design and its application creates a
new set of considerations for the deep water Motion
Compensating Coil Tubing Lift Frame. For this reason the
Stingray MCCTLF has been designed using the compensating
cylinders as compression members. By doing this the
advantages are great. This is discussed in the following
section.









The handling logistics are also critical. Transporting an
item of this size, lifting it onto the rig, inserting it into the
derrick, and stabilizing it are strong considerations in this design.

All areas of the Stingray CTLF have been analyzed with regard to
minimizing its weight.


An
additional consideration is the coordination of the
existing equipment on the rig. It may be possible to use some of
the existing motion compensation bottles and air compressors to
resolve any logistical requirements. Because of the specialization
of this type of equipment, each rig application will require a
moderate to extensive review. This is why the weight and
handling of the unit is so critical.







Operational Philosophy Cont’d…

MCCTLF Stability


Cylinder Guidance


The MCCTLF design has taken into consideration the potential
for axial and lateral loads.


The SOS MCCTLF system utilizes four (4) cylinders which can
better balance the loading.


The cylinder rods are fully protected by the Sub Frame’s
structure.


The Sub Frame has stainless steel sliding surfaces which
interface with the Winch Frame’s (upper section)
nylatron

sliding pads (see drawing SOS
-
10
-
123
-
093).


The Extension Legs (middle section) have stainless steel
sliding surfaces which interface with the Compensation
Cylinder’s
nylatron

sliding pads (see drawing SOS
-
10
-
123
-
093).



MCCTLF Stability


Cylinder Guidance
Cont’d…


Having completed the first version of the MCCTLF, SOS has
already reviewed and incorporated additional sliding pads
into the design for increased guidance and stability.


The rod clevises have spherical bearing assemblies to
accommodate misalignments and avoid transmission of
torque into the cylinder rods.

MCCTLF Guides


The

Stingray

MoComp

CTLF

operates

by

applying

high

pressure

air

to

the

blind

side

of

the

compensation

cylinders

rather

than

the

rod

side
.

The

positive

effects

of

this

application

outweigh

any

negative

effects

in

the

following

manner
:


The weight of the SOS CTLF is much less than competitive
units.


The actual operation of the SOS CTLF is very similar to the
older inline drill string compensator. This makes for very
simple controls and maintenance.


By using trunion mounted cylinders with high strength steel it
is possible to create the same or better balance of the load.
This approach also allows the framework to function as
protection for the cylinder rods.

Design Advantages



The unit has the ability to either attach to the riser by the
traditional means of bails or the test tree can be installed in
-
place utilizing a special bushing. The latter greatly reduces the
height of the operational string
.



By utilizing the blind end for the compensation force, the
system becomes much more efficient as there are no losses
due to rod area that a tension type system would have.



By employing the cylinder rod in compression, a larger
diameter is required. However, this benefits the system by
reducing the volume required for the rod end Air/Oil
reservoirs.


Design Advantages Cont’d…



Speed control is easily achieved by having the low pressure oil
on the rod side of the cylinder; enabling the use of industry
standard and field
-
proven speed control devices for the
dampening and control of the barrel and rod travel.



Applications using a rod end vent to atmosphere have
contamination and corrosion problems. The SOS CTLF avoids
this through the implementation of Air/Oil reservoirs.



There is only Air on the high pressure blind side of the SOS
CTLF. This makes the unit much more responsive as air flows
much easier than oil. In addition, it removes the requirement
for large, heavy accumulators and overly complicated speed
control devices.




Design Advantages Cont’d…


The bail pins are hydraulically operated; making it safer and
easier to use.



There is a hydraulically operated gate system on the lower
frame. This allows for the test tree and riser to be mounted
directly in the frame. This removes the requirement for bails
and thus reducing the overall length of the system in the
derrick.



There is an
optional

hydraulically operated “jib arm” with a
light duty winch for the handling of small equipment.



Critical cylinders have built in mechanical lock in the closed
position the do not rely on a hydraulic lock.


Additional Key Features

Pneumatic System Schematic

Hydraulic System Schematic

Control Panel Schematic

Speed Control Valve

General Arrangement

MCCTLF 500
-
350
-
20

MCCTLF 500
-
350
-
20 MCCTLF

MCCTLF 500
-
35
-
20MCCTLF