PVC slotted pipe is a special structure of pipe. It can achieve filtering and penetration functions by machining precise gaps in the pipe wall. It is widely used in deep water wells, seepage wells, oil extraction and other fields. The following is an introduction to its main features and applications:
Structure and material:
1. Material: It mainly uses rigid polyvinyl chloride (PVC-U), which has the characteristics of environmental protection, pressure resistance, and corrosion resistance. Some products add reinforcing materials to improve bending strength (such as ring stiffness up to 58KN).
2. Slit design: Rectangular, trapezoidal or bridge-type gaps are formed by cutting process. The width of the gap is usually 0.2-0.5mm, and the permeability is controlled between 0.5%-10%. Some double-layer composite structures can improve sand retaining capacity.
Technical parameters:
1. Size specifications: DIN standard: 63-800mm, ASTM standard: 21.3-323.9mm, and the length is mostly 6 meters/piece.
2. Performance indicators: working pressure 0.8MPa, tensile strength 23KPA-36KPA, continuous use humidity ≤30℃, suitable for various formations such as sandstone and conglomerate.
Application areas:
1. Water well engineering: as a seepage pipe or filter pipe, used for deep well drainage and farmland irrigation, its smooth inner wall reduces water flow resistance.
2. Petroleum industry: used for underground sand control operations, blocking formation sand particles with a particle size of ≥0.3mm, and extending the life of oil wells.
3. Municipal and environmental protection: suitable for sewage collection, geothermal engineering, etc., acid and alkali resistance is suitable for chemical fluid transportation.
Advantages and trends:
1. Environmental protection and economy: PVC materials are recyclable, easy to construct, and the cost is lower than that of metal pipes.
2. Technological development: the production capacity of high-frequency welding process is improved, the proportion of composite slotted pipes is increased, and the permeability range of formations is expanded to 0.1-15μm².
