Perforation is the step that connects a sealed, cased well to the reservoir - the deliberate punching of holes through the casing and cement so hydrocarbons can flow in. Without it, a cased-hole well is a closed steel tube; with it, the reservoir has a path to the tubing. This guide explains what perforation is, how shaped charges make the holes, and where perforating fits in the completion sequence.
Perforation in one line: Perforation is the process of creating holes through a well's casing and cement into the reservoir rock so that oil or gas can flow from the formation into the wellbore. It is done with a perforating gun that fires explosive shaped charges at chosen depths, opening flow paths in an otherwise sealed cased hole.
A cased and cemented well is sealed off from the formation by steel and cement, so a completion must create flow paths on purpose. This is done with a perforating gun - a carrier holding an array of explosive shaped charges - lowered to the target depth on wireline or coiled tubing. When fired, each shaped charge collapses a metal liner into a high-velocity jet that punches cleanly through the casing, the cement sheath, and a short distance into the reservoir rock, leaving a perforation tunnel.
The result is a set of tunnels connecting the reservoir to the inside of the casing, so fluids can flow from the formation, through the perforations, and up the production tubing. Firing is precisely depth-controlled so perforations land in the productive zone and avoid water or gas intervals that should stay sealed.
Perforating jobs are specified by shot density - the number of holes per foot, often 4 to as many as 20 - and by phasing, the angular spacing of shots around the pipe so tunnels radiate in different directions rather than all pointing the same way. Higher shot density and good phasing increase flow area and distribute drawdown, which matters for productivity and stimulation. Charge size and casing weight determine how deep the tunnels penetrate.
Guns come in different forms - casing guns run on wireline, tubing-conveyed guns run on the completion string for long or deviated intervals, and through-tubing guns for reperforating existing wells. In modern plug-and-perf completions of horizontal wells, perforating and hydraulic fracturing alternate stage by stage along the lateral, with each cluster of perforations feeding a frac stage.
Perforation is one of the final steps that turns a drilled and cased well into a producer. It follows casing and cementing and precedes or interleaves with stimulation. In a conventional well, the zone is perforated and the well is brought on production; in an unconventional horizontal, clusters of perforations are shot and then hydraulically fractured stage by stage down the lateral. Perforating itself is a wireline or downhole service operation rather than a continuously monitored process, so it does not feed production SCADA directly. Once the well is on production, though, the pressures and flow the perforations enable are exactly what a cloud SCADA such as Merobix trends from the wellhead - reading tubing and casing pressure tags over Modbus or DNP3 to show how the perforated zone performs over time.
Perforation is the creation of holes through a well's casing and cement into the reservoir so oil or gas can flow into the wellbore. It is done with a perforating gun that fires explosive shaped charges at chosen depths, turning a sealed cased hole into a producing one by opening flow paths to the formation.
A perforating gun carrying explosive shaped charges is lowered on wireline or coiled tubing to the target depth and fired. Each shaped charge forms a high-velocity jet that punches through the casing, cement, and a short distance into the rock, leaving a perforation tunnel that connects the reservoir to the inside of the casing.
Shot density is the number of perforation holes fired per foot of interval, commonly 4 to 20 shots per foot. Together with phasing - the angular spacing of the shots - it determines the flow area and how drawdown is distributed. Higher shot density generally improves connectivity between the reservoir and the wellbore.
This page references the protocol specifications published by the organizations below. Editions, product capabilities, and documentation change over time - confirm current requirements and specifications directly with the source.
Last reviewed: July 27, 2026. Merobix is not affiliated with, endorsed by, or sponsored by these organizations; their names are used only to identify the standards and products discussed.
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