Common Requirements for Borehole Casing
Regardless of the construction method, Borehole Casings and screens have some common requirements. Strength must be adequate to withstand not only the stresses of installation but also other forces which may be applied during well completion, development and use.
The forces of installation which tend to pull the Borehole Casing and Screen apart must be exceeded by the tensile strength of the material. The resistance of the Borehole Casing to collapse must be greater than the external hydrostatic forces calculated.
These stresses can rupture casings and screens. Another requirement related to strength is durability.
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| What Is Borehole Casing and Why Is It Important? |
What Is Borehole Casing?
Borehole Casing is a large-diameter pipe that is inserted into a recently drilled section of a borehole, to protect and support the borehole stream.
Once a Borehole has been drilled, if it is to become a production well, the well must undergo completion. While Drilling Borehole cuts through the rock formations and allows drilling engineers to reach the reservoir below, the raw sides of the Borehole cannot support themselves.
Similar to the bones of your spine protecting the spinal cord, the casing is tubing that is set inside the drilled Borehole to protect and support the well stream.
In addition to providing stabilization and keeping the sides of the Borehole from caving in on themselves, casing protects the Borehole from outside contaminants, as well as any freshwater reservoirs from the oil or gas that is being produced.
Also known as setting pipe, casing a Borehole involves running the PVC pipes down the inside of a recently drilled Borehole. The small space between the casing and the untreated sides of the Borehole is filled with Gravel Pack to permanently set the casing in place.
Casing A Borehole: The Purpose
The casing is fabricated in sections, or joints, that are usually about 40 feet long and joined together with Solvent Cement to form longer lengths of the casing, called casing strings.
- Prevents the pollution of water from the borehole.
- Prevents unbalanced upper formations from caving in and sticking the drill string.
- Provides a strong upper foundation to allow the use of high-density drilling fluid to continue drilling deeper.
- Isolates various zones, which may have different pressures or fluids, in the drilled formations from one another.
- Seals off high-pressure zones from the surface.
- Prevents fluid loss into or contamination of production zones.
- Provides a smooth internal bore for installing production equipment.
The Benefits Of PVC Borehole Casing
PVC is used for Borehole Casing. PVC is a wholly diverse material, used for a massive range of applications that span several industries. When it comes to plumbing and waterworks it is often the preferred material, which makes for little surprise that it is an ideal solution for borehole casing pipes.
1. Corrosion Resistant
Borehole pumps are particularly susceptible to both rust and corrosion. PVC piping is made from a versatile material that is completely corrosive resistant, making it ideal for borehole pumps which provide the exact kind of environment where galvanic corrosion thrives.
2. Durable and Long Lasting
PVC piping ages well, which is why it is commonly found in homes and buildings all over the world. Borehole pumps operate constantly and often under gruelling circumstances. PVC is remarkably resistant to these types of damage.
3. Simple to Install
PVC is a fairly simple material to work with, and requires few if any, specialized tools to manipulate and fit it. This makes PVC casing fairly simple to install and maintain when the need arises.
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| Durable, Corrosion-Resistant PVC Casing |
Get The Right Casing for Your Project
Nakiso Borehole Drilling uses high-quality Class 9 and Class 10 casings to ensure the longevity of your borehole.
Chat With UsAbout Nakiso Borehole Drilling
At Nakiso Borehole Drilling, we are your comprehensive partner for unlocking reliable water on your property. Our highly skilled team tackles all drilling projects, from standard boreholes to specialized Blast Hole and RC Drilling.
We handle everything in-house for a seamless experience, encompassing expert borehole siting, efficient drilling, and pump installation – solar, electric, or manual – tailored to your specific needs. With Nakiso, your reliable water source is just a drill away.
We don't just strive to be the best; we maintain the industry's strictest quality standards and are committed to sustainable practices for the future of Zimbabwe's water security.
Fact 1: Know Your Borehole Casings
The Preferred Borehole Casing In Zimbabwe Is Class 9 and 10 (Pressure Classes.)
This is because Class 9 and Class 10 Casings are more collapse resistant. The strength of a Casing is often described as collapse resistance.
Fact 2: Borehole Drilling Depth
The exact depth, of where the water is located, cannot be established by the drilling contractor nor the Water Surveyor (Borehole Siter).
Fact 3: There Is No 100% Guarantee
It is important to note that it is never a 100% guarantee that any hole will yield water, the amount and water quality can also not be guaranteed by the drilling contractor and water surveyor.
Fact 4: Siting Is Important
Making use of a hydrologist or traditional water diviner will increase your chances of having a successful borehole that will yield a sufficient amount of water.
Fact 5: Know The Risks
The risk of the borehole drilling lies with the property owner. The client will still be liable for the drilling costs irrespective of a borehole yielding water or not.
Our Branches and Our Contacts
Churchill Ave Branch
Business Offices (HQ):55 Churchill Avenue,
Alexandra Park,
Harare North,
Zimbabwe.
Call Us Today:
Office Numbers: +263 867 71 88844
Sales: +263 78 860 8009
Operations: +263 78 860 8005
Marketing: +263 78 876 6701
Email: info@nakisoboreholes.co.zw
Website: www.nakisoboreholes.co.zw
Bluff Hill Branch
Business Offices:36 St. Anthans Drive,
Bluff Hill,
Harare,
Zimbabwe.
Call Us Today:
Office Numbers: +263 71 494 0883
Sales: +263 78 860 8009
Operations: +263 78 860 8005
Marketing: +263 78 876 6701
Email: info@nakisoboreholes.co.zw
Website: www.nakisoboreholes.co.zw
