Plunger Lift Systems
Plunger lift is one of the most economical artificial lift methods for removing liquids from gas wells. It uses the well’s own energy — reservoir pressure — to cycle a free-travelling plunger up and down the tubing, lifting accumulated liquid slugs to surface without requiring an external energy source such as compression or a pump motor.
Proxima supplies plunger lift equipment from ChampionX — PCS Ferguson brand — for gas well deliquification and marginal oil well production in Azerbaijan.
How Plunger Lift Works
A plunger — a precision-machined steel cylinder — sits at the bottom of the tubing string on a bumper spring. When the surface motor valve closes, the well builds pressure. When pressure reaches the set point, the motor valve opens, and the pressure differential drives the plunger upward, carrying a liquid slug above it to surface. At surface, the plunger is caught by a lubricator, the liquid is diverted to the flowline, and the plunger falls back to bottom to repeat the cycle.
The cycle rate and timing are controlled by a surface controller that monitors casing and tubing pressure to optimise production.
When to Use Plunger Lift
Plunger lift is most effective when:
- A gas well is loading with liquids, reducing or killing production
- The well has sufficient reservoir pressure to cycle the plunger
- Production rates are low-to-moderate (typical for mature wells)
- Operating cost must be minimised — plunger lift has very low OPEX compared to other lift methods
It is widely used in mature gas fields and as a transition lift method when wells decline from gas lift or rod lift rates.
Product Range
Downhole Equipment
PCS Ferguson supplies a full range of plunger types matched to well conditions:
| Plunger Type | Application |
|---|---|
| — | — |
| Pad plunger | Moderate debris, consistent lifting |
| Brush plunger | Debris-laden wells requiring cleaning |
| Sand plunger | High-sand environments |
| Solid plunger | High-efficiency lifting, long life |
| Shock absorber plunger | High impact loads, reduces equipment fatigue |
| First Responder™ two-piece | Fast-fall design for high-liquid wells |
Bumper springs, standing valve combos, and tubing stop springs complete the downhole assembly.
Surface Controls
The SMARTEN™ Unify Control System from PCS Ferguson brings digital control to plunger lift operations. It monitors casing and tubing pressure, optimises cycle timing, and provides remote visibility of well performance. The system is designed to maximise production from marginal wells where digital investment has historically been difficult to justify.
Key Specifications
| Parameter | Details |
|---|---|
| — | — |
| Tubing sizes | 2⅜” – 2⅞” standard |
| Plunger OD | Matched to tubing ID |
| Controller | SMARTEN™ Unify — pressure-based cycle control |
| Telemetry | Remote monitoring capable |
| Standards | API |
Why Source Through Proxima
Proxima supplies PCS Ferguson plunger lift equipment with local engineering support for system design, plunger selection, and controller configuration. We assist with cycle optimisation during commissioning.
Frequently Asked Questions
Q: Does plunger lift require external energy?
No. Plunger lift uses the well’s own reservoir pressure to cycle the plunger. The only external energy required is for the surface controller — typically a small solar panel or battery unit.
Q: What reservoir pressure is needed for plunger lift?
As a general rule, the casing pressure must be at least 1.5 times the tubing pressure at the surface for plunger lift to work. A detailed analysis using well data gives a more precise answer. Contact Proxima for a feasibility assessment.
Q: Can plunger lift be used in a deviated well?
Plunger lift works best in wells with less than 50° deviation. In more deviated wells, the plunger may not fall reliably to bottom. Contact Proxima to discuss your well geometry.
Q: How often does the plunger need to be serviced?
Plunger run life depends on well conditions. In clean gas wells, a plunger may run for months without intervention. In sandy or corrosive wells, more frequent inspection is advisable. The lubricator catches the plunger at surface on every cycle, allowing visual inspection without intervention.
