Johnson Screen Tube Applied in Deep Groundwater Well System

Project Background

A regional water supply project required a reliable well screen solution for deep groundwater extraction. The well was designed to access a confined aquifer at a depth of approximately 180 meters. Geological analysis showed that the formation consisted mainly of fine and medium sand, making effective sand control a key requirement for long-term well performance.

The original design considered slotted pipes; however, concerns were raised regarding sand intrusion, clogging, and reduced open area over time. To ensure stable water production and long service life, a Johnson-type screen tube was selected after technical review.

Application Challenges

The project presented several practical challenges:

Fine sand formation requiring accurate sand retention

High external pressure due to installation depth

Requirement for stable flow with minimal head loss

Long-term exposure to groundwater conditions

Need for reduced well development time

The screen tube needed to maintain structural strength while providing consistent filtration performance throughout its service life.

Solution Provided

Johnson Screen Tubes with continuous slot construction were supplied for this project. The screens were manufactured by helically wrapping V-shaped wire around longitudinal support rods and resistance-welding each contact point to form a rigid, self-supporting structure.

The continuous slot design provided uniform opening size along the entire screen length, allowing water to enter freely while preventing fine sand from entering the well. Stainless steel was selected to improve corrosion resistance and ensure long-term reliability under groundwater conditions.

Slot size was chosen based on formation grain size analysis, ensuring effective sand control without sacrificing well yield.

Product Specifications

Screen Type: Johnson-type continuous slot screen tube

Material: Stainless Steel 316L

Slot Size: 0.75 mm

Outer Diameter: 273 mm

Length per Section: 6 m

Connection Type: Threaded ends

Manufacturing Method: Resistance welded wire wrap construction

All specifications were customized according to the well design and geological conditions.

Results and Performance

Following installation, the well achieved stable water production with minimal sand content. The continuous slot design reduced frictional head loss, allowing efficient pumping at the designed flow rate.

Well development time was shorter compared with previous projects using slotted pipes. After extended operation, the screen tube showed no signs of corrosion or structural deformation. The water supply system has remained stable with reduced maintenance requirements.

Conclusion

This case demonstrates the effectiveness of Johnson Screen Tubes in deep groundwater well applications. Their continuous slot design, high structural strength, and corrosion resistance make them a dependable solution for sand control and long-term water production.

Johnson Screen Tubes are widely used in water supply wells where consistent performance and durability are essential.