Both methods use energy to remove incrustation and restore flow. The practical difference is where that energy goes — and that determines which wells each method can actually help.
How high-pressure jetting works
A jetting tool with nozzles is lowered on drill pipe and rotated slowly through the screen interval while water is pumped at high pressure. The jets strike the inside of the screen, cutting and washing deposits from the slot openings. Performed with simultaneous pumping, dislodged solids are drawn back into the well and removed.
Jetting is a proven method, and for the right problem it is a good one: soft or recent deposits on the inside surface of the screen; drilling-fluid residue after well construction; wells where the plugging has not yet migrated into the gravel pack.
Where jetting stops
The jet's energy is delivered by water velocity — and water velocity dissipates very quickly once the jet passes through the screen slot. In practice, jetting cleans the inner screen surface and the slot openings; its effect fades within the first part of the gravel pack. The deeper the plugging sits, the less a jet can do about it.
This matters because in most aging wells, the flow restriction is not on the inner screen surface. Mineral incrustation (iron, manganese, carbonate) and biofouling develop where groundwater velocity and chemistry change — in the screen slots, throughout the gravel pack, and in the near-wellbore zone. A well can be jetted until the screen shines on camera and still recover little of its lost specific capacity, because the blockage sits beyond the jet's reach.
"Rehabilitation results are not measured by video. They are measured by restored specific capacity. A clean-looking screen with a plugged gravel pack is still a low-yield well."
How the impulse works
An impulse generator (the AirShock® AIG) is lowered into the well on a hose and fired at 15–25 pulses per minute using compressed nitrogen or air. Each pulse produces two effects:
- An elastic pressure wave that propagates through the water column, the screen, the gravel pack, and into the near-wellbore zone. Unlike a water jet, a pressure wave does not stop at the screen — it travels through it.
- An oscillating gas bubble that expands and collapses, forcing water out into the formation and drawing it sharply back. This surging action mechanically breaks incrustation and biofilm and carries the dislodged material into the well bore, where it is pumped out.
This is the physical reason impulse treatment affects zones a jet cannot reach: a pressure wave is not stopped by the screen, and the surging bubble moves water through the pack and formation in both directions — the same mechanism used deliberately in well development.
Honest comparison
| High-pressure jetting | Impulse (AirShock®) | |
|---|---|---|
| Energy carrier | Water velocity | Pressure wave + oscillating bubble |
| Effective reach | Screen surface and slots | Screen, gravel pack, near-wellbore zone |
| Best for | Surface deposits, post-drilling cleanup | Incrustation and biofouling in the gravel pack and formation; bridged gravel packs; sand-control applications (documented cases on file) |
| Deployment | Drill pipe, rotation | Hose reel |
| Solids removal | Simultaneous pumping required | Simultaneous airlift/pumping recommended |
| Limitations | Limited penetration; results often short-lived when plugging is deep | Requires correct tool sizing and pressure selection for the well design; PVC wells need dedicated low-energy models |
They are not always competitors
On many jobs the methods complement each other. Jetting or brushing can pre-clean the screen surface; impulse then treats the gravel pack and formation. Combined with chemical treatment, impulse agitation accelerates dissolution of incrustation and can substantially reduce the chemical volume required.
Choosing for a specific well
The right method depends on the well design, age, geology, and — most importantly — where the plugging actually is. A step-drawdown test before and after treatment is the honest way to measure any rehabilitation, whatever the method. Results always depend on site conditions and correct system configuration.
Describe your well — diameter, depth, screen type, symptom — and we will tell you frankly whether impulse treatment fits, and which AIG model applies.