fractures in the reservoir, from which oil or gas flows to surface.
Explosive perforation technologies have been applied extensively
over the last 50 years in the oil industry to create holes and fractures
in the reservoir, from which oil or gas flows to surface. Rigless perforating systems such as strip-jet guns or retrievable guns,
have traditionally lagged Rig-based systems such as under-balanced
Tubing Conveyed Perforating (TCP), or the recent Highly-Overbalanced
Perforate and Stimulate Perforators.
However, the development and
introduction of new generation through-tubing (Rigless) perforating
systems has directly addressed the limitations of perforator penetration,
hole sizes, phasing etc.
Two types of perforating systems were introduced to "correct" the
performance issue of rigless perforation technology:
- Swing-Jet Perforator: Utilizes a spring-loaded mechanism and
pivot-mounted charges designed to allow the deployment of the
gun through 2-3/8" or larger tubing, which later opens up in casing.
After deployment, the gun has an effective diameter of 4-1/2" or
5-1/8" depending on the gun size, and delivers penetration and hole
size performance comparable to rig-deployed tubing or electric line
conveyed guns.
- Spiral-Jet Perforator: This gun combines radial coverage (phasing) and
high shot densities of casing guns, with deep penetrating charges and
retrievable strips.
- Other rigless perforating systems offered by Oildata are:
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