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Concrete plugs are used to create a watertight seal in wells, damaged sections, or around supports. Cement grout is used to create additional strength. They can be used to close old water wells or seal off oil wells. They can fail under certain circumstances, requiring restoration.
Concrete plugs are sections or portions of concrete that are placed into a well as a means of creating a watertight seal. A balanced concrete plug is sometimes used to seal a well that is no longer in operation or to seal a section of a well that has been damaged or disabled. This particular type of construction approach can also be used as a means of sealing around supports for a platform or in any situation that requires creating a seal that prevents liquids from entering or exiting holes, chasms or boreholes.
Making a cement dowel often involves using what is known as cement grout. The slurry has other elements mixed into the base concrete, typically as a means of providing additional strength to the plug once it is in place and hardened. When installed correctly, the plug creates an airtight seal that prevents air or liquid from escaping around the gasket, effectively plugging the bore area.
You can use a concrete dowel in several applications. This approach is sometimes used to close old water wells that have dried up. In this application, the plug is normally used as both a well plug and placed further down the well, then topped with loose soil. With this application the aim is to prevent people or animals from accidentally falling into the shaft of the abandoned well.
A concrete plug can also be used to seal off oil wells that are no longer in operation. This approach can be used with both land and ocean drilling. In each scenario, the cement slurry is poured directly into the borehole, acting as a plug that will not allow the additional oil to reach the surface. With an oil well that has run dry, the cap is usually enough to complete the operation. In the event that the additional oil is still building pressure against the plug, the additional materials may be compacted against the concrete plug, which helps maintain seal integrity.
While a concrete plug is able to withstand great pressure, there is a possibility that the construction will fail under certain circumstances. For example, an earthquake could create additional damage to the sealed shaft or well hole that would remove or displace the plug slightly. This would make it necessary to start a project to restore the correct functioning of the seal.
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