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Perforating
& Setting Services
- Perforating Services
- Capsule Detonating Crossover
- Multi-Stage Bar Firing Head
- Through-Tubing Swing Jet
- Bridge Plug Setting
- Through-Tubing Bridge Plugs
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Wireline
Conveyed Perforating (WCP)
WCP includes two types of operations: cased perforating
and through tubing perforating.
The through tubing perforating means that the
explosive chain is conveyed by wireline through
tubing thus creating an initial underbalance
between the formation and borehole. The cased
perforating is an overbalance perforating in common
conditions to control the well pressure. However
the effectiveness of the cased perforating is relatively
better than that of the through tubing perforating
due to the bigger OD of the carrier and the charge being
filled with more explosive.
Benefits
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- The procedure is very simple, so it can be
operated easily
- Save operation time in shorter intervals
- The safety of the personnel and equipment
can be completely ensured
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Tubing
Conveyed Perforating (TCP)
TCP provides a means for completion wells to
use the natural formation pressure to flush
the completion debris into the wellbore immediately
after perforating. Typically, high-performance
cased perforators of several hundreds meters
long are attached to the tubing strings beneath
a packer.
Benefits
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- Reducing the risks associated with hostile
environments involving H2S and high bottom hole
pressure
- Tandem connections contain no high explosives
- Reduced operation time result in saving rig time
- The existence of the differential pressure
between the formation and wellbore while perforating
can flush the completion debris into the wellbore
- Formation can be protected effectively thanks
to the under balance
- Mechanical gun release can be chosen to complete
other operations such as oil production, production
logging and so on
- Wide application - it can be used in high
deviated wells and horizontal wells in which
the wireline type has a lot of difficulty to perforate
accurately
- Mechanical Firing Head, APF-C Firing Head,
TCP
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Capsule
Detonating Crossover
The capsule detonating crossover was designed to
reduce pollution problems and operating hazards.
The device is set at both ends of the interlayer
gun in order to receive the explosive wave and
output the explosive wave which will detonate the
perforation gun. It can keep the interlayer gun
sealed from well liquid after perforating.
Benefits/Capabilities
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- Fits all kinds of perforating guns
- Can boost explosive wave reliably
- Can output explosive wave stably
- Can seal interlayer gun after perforating
- No feculence remains in interlayer gun, does not
pollute flat and ocean water
- Can reuse interlayer gun without much cleaning
- The bleed valve can effuse the explosive gas,
which ensures safety when disassembling the guns
- Quicker disassembly, less labor
- If the gun is damaged, the device at the sealed
interlayer can be reused
- Can provide two boost channels upward and
downward
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Multi-stage
bar firing head
The multi-stage bar firing head is designed
to detonate TCP guns. When the gun is detonated,
it will subsequently detonate the next stage guns
Benefits / Capabilities
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- Can be used in long interlayer TCP
- The drop bar can self-destruct
- Delay time is 1.5-2min
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Through-Tubing
Swing Jet Perforator
The through-tubing swing jet perforator is designed
to perforate in WCP without pulling out the tubing.
It can convey charges to the destination through
the tubing.
After the release detonator is detonated,
the trigger is released, the charge is swung to be
equal to the axis of the guns, and the electrical detonator
is ignited from the surface which will subsequently
detonate the detonating cord and charges.
Benefits / Capabilities
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- Can re-perforate in old well without pulling
out the tubing
- Can be used with relative big charges to perforate
deeper holes
- Firing circuitry is shorted before
the charges are released
- Mechanical action security.
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Bridge
Plug Setting
Bridge plugs generate a temporary or permanent
seal between two zones in a well. CNLC has both
basket (through-tubing) and cast-iron bridge
plugs.
Applications
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- In common conditions, a bridge plug is used
to separate the lower layer from the upper one
while testing the upper layer
- To establish a bridge plug below the perforated
section that is to be squeezed, cemented or
fractured
- To provide pressure-tight seals for testing
casing or for wells that are to be abandoned
- To set in casing above zones to be abandoned
and recover the upper casing.
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Through-Tubing
Bridge Plugs
Through-tubing bridge plugs offer a fast, easy,
and economical way to permanently plug back
a well without using expensive workover or snubbing
services to pull out production tubing. After
the plugback assembly is lowered through the tubing
into the casing, serrated slips anchor the assembly
to the casing and a basket is expanded to form
a strong base for the placement of cement. An
internal bypass system allows fluid to migrate
through the plug while the cement hardens. The bypass
system is closed by a wireline-actuated mechanical
valve. The plugback assemblies are available
in several sizes for use in 4-1/2 to 9 inch OD
casings at temperatures up to 400¨H.
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