Definition - What does Cement Casing mean?
Cement Casing, also known as well cementing or well cement casing, is a process in which cement slurry is placed in the annular space between the casing and the open hole below the casing string. The cement creates a good bond between the pipe and the formation. Generally, well cementing can be broadly categorized into two categories: Primary cementing and Remedial Cementing.
Petropedia explains Cement Casing
Primary Cementing- In Primary Cementing process, cement slurry, water and cement additives are mixed and pumped down through the open hole below casing string. The main functions of primary cementing are to:
- Restrict fluid movement between hydrocarbon formations and the surface.
- Bolster the well casing.
- Prevent pollution of fresh water zones from a developed well.
- Make casing corrosion free.
Remedial Cementing- As the name suggests, remedial cementing is performed to rectify primary cementing jobs, if any. There are two types of remedial cementing performed in a wellbore, i.e., squeeze cementing and plug cementing.