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Tubing Conveyed Perforating

Tubing Conveyed Perforating

This is a system where casing guns are deployed down-hole on tubings. Detonation is activated by mechanical impact or hydraulic means.

The perforation is often done in underbalance conditions, however with simultaneous injection of proppant to enhance near-well bore conductivity, perforating can be done in extreme conditions.

The gun consists of scalloped hollow-carrier casings that house the charge tube, the charges and primacord which direct the train of detonation.

The detonating devices or firing heads are of two basic types:

  • Impact-actuated firing device
  • Pressure-actuated firing device

The accessories include but are not limited to:

  • Debris barrier, which blocks pipe or tubing debris from falling on and blocking off the firing pin, and serves as a production vent.
  • Impact-actuated vent which is a tool that is used when the need for a closed string BHA arises.

SPECIFICATION
Gun Size
Shot Density
Phasing
7" 12 SPF 60 o
6" 12 SPF 45 o
5" 12 SPF 30 o
4 1/2" 12 SPF 60 o
4" 9 SPF 40 o
4" 4 SPF 90 o
3 3/4" 12 SPF 60 o
3 3/4" 12 SPF 45 o

These details allow for designs that optimize the performance of the well, taking into consideration casing and reservoir characteristics.

ADVANTAGES
  • It makes for shortest possible completion time
  • It allows for immediate perforation clean up
  • It has the ability to perforate long or multiple intervals in a single trip
  • Eliminates ballout/breakdown
  • Reduces stimulation costs
  • Safety is assured as controlled well conditions prevail during perforation
  • It performs efficiently in highly deviated wells
  • Perforating and testing can be achieved in one trip
APPLICATIONS
  • Completion formations with high permeability (at least 5 to 10 millidarcies), low bottom hole pressure, and near-well bore damage/high skin factors
  • Completions where underlying water or overlying gas cap precludes hydraulic fracturing
  • Pre-fracturing evaluation in formations with marginal permeability and reservoirs where water content might be excessive

If you would like more information on this tool, please fill out our Service Request Form.

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Case Histories

Oildata was the first company to successfully record a horizontal well Production Log on an ExxonMobil Well in West Africa

– Ubit 71, Ubit 75, 1995

The first service company to log a memory log on a short Radius horizontal well in Africa.

– Ashland, 1997

Oildata was the first company to design and install an open-close-open straddle packer system to isolate a high pressure gas zone while simultaneously permitting the production of oil from a deeper horizon.

– ChevronTexaco, 1998, 1999

Oildata was the first company to deploy a wireline tractor in a horizontal well in Nigeria to acquire reservoir data without coiled tubing or pipe conveyed logging equipment.

– Shell, 1999

Oildata successfully re-established oil production from the abandoned Salt pond Marginal field, offshore Ghana.

– SOPC/GNPC, 2002

Oildata has performed 100% of ChevronTexaco's non-rig well interventions and data acquisition requirements in Nigeria since 1996

– ChevronTexaco, 1996

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