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Through-Tubing Perforation

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:

1. 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.
2. Spiral-Jet Perforator: This gun combines radial coverage (phasing) and high shot densities of casing guns, with deep penetrating charges and retrievable strips.
3. Other rigless perforating systems offered by Oildata are:
   • Slickline or Coil-tubing deployed Hydraulically Actuated Reliable Perforating system
   • Golden Swing-Jet
   • Integrated Motorized Perforating And Correlation Tool (IMPACT)