What Is Borewell Casing Pipe?

Basic concept of borewell casing pipe

Borewell casing pipe is a tubular structure embedded in the borewell. It is a pipe installed inside the borewell to protect the wellhead and well wall, prevent pollution, collapse and cracks, and prevent water source from being polluted by foreign substances and water quality deterioration.

Types of borewell casing pipe

Depending on the connection method and manufacturing process, it can be divided into threaded connection casing pipe, straight seam welded casing pipe, pressure-bearing casing pipe and seamless casing pipe, each type is suitable for different geological conditions and engineering requirements.

1. Threaded connection casing pipe

Spliced through threaded interface, simple construction, and can be disassembled repeatedly; suitable for medium and small diameter borewells and temporary water extraction projects.

2. Straight seam welded casing pipe

After the steel plate is rolled, it is welded along the straight seam to form a high strength and good rigidity; suitable for deep borewells, high pressure environments and complex geological conditions.

3. Pressure casing pipe

It has a structural design that can resist external formation pressure; it is suitable for professional uses such as high-pressure aquifers, mining areas, and oil fields. In the system related to OCTG pipe, its pressure bearing performance is crucial.

4. Seamless casing pipe

It is extruded from a whole seamless pipe, without welds, and has excellent corrosion resistance and pressure resistance. Compared with mild steel pipes, it is more corrosion-resistant and often used in highly corrosive formations or drinking borewells with extremely high water quality requirements.

Core functions of borewell casing pipe

1. Wellhead protection

By covering the wellhead area, it effectively blocks external pollutants such as sand, fallen leaves, and insects, while preventing wellhead rust and leakage caused by precipitation accumulation, and can also ensure the sealing of the pipe flange connection.

2. Well wall reinforcement

The casing pipe is tightly combined with the well wall to provide structural support, prevent well wall collapse, soil erosion and groundwater infiltration, and ensure the long-term stability of the well structure.

3. Water quality assurance

Isolate the upwelling of bottom sediment and harmful substances, maintain the sanitary standards of water sources, and provide basic protection for drinking water safety.

Main features of borewell casing pipe

1. High strength and pressure resistance

High-quality carbon steel, stainless steel or high-density PVC, wall thickness can be customized to adapt to different burial depths and water pressures.

2. Corrosion resistance

Epoxy resin/polyethylene coating or PVC body, long-term protection against sulfide, salt, acid and alkali corrosion.

3. Reliable sealing

Thread + sealant or welding non-destructive testing to prevent surface runoff and harmful substances from invading.

4. Wear and aging resistance

Surface sandblasting and shot blasting + anti-corrosion treatment, PVC is weather-resistant and impact-resistant, and its service life can reach more than 30 years.

5. Convenient installation

Thread/quick-release interface, flexible assembly; smooth inner wall for easy cleaning and disinfection.

6. Diverse specifications

Diameter 50–≥500mm, a variety of materials and accessories, can meet the needs of multiple scenarios such as home, agriculture, industry, and municipal administration.

Maintenance and management of borewell casing pipe

1. Periodic inspection and cleaning

It is necessary to regularly remove debris around the wellhead, check the sealing of the casing pipe connection, and apply anti-rust treatment if necessary. For some borewell casing pipe systems with valves installed, it is also necessary to check the opening and closing flexibility and sealing of the valves.

2. Damage repair and replacement

When deformation, cracks or severe corrosion of the casing pipe are found, repair or overall replacement measures should be taken immediately to avoid affecting the overall function.

Summary

The borewell casing pipe is a very important part of the borewell. It can not only protect the borewell from external pollution and physical damage, but also ensure the safe and reliable circulation of well water. The borewell casing pipe ensures the normal operation of the borewell through multiple protection mechanisms. Its scientific selection and standardized maintenance are important links to ensure the sustainable use of water resources. At the same time, we need to properly clean and maintain the borewell casing pipe, and also need to pay attention to its wear problem to ensure the stable operation of the borewell.

Read more: Specifications and dimensions of oil casing or The difference between tubing and casing