Definition - What does Well Cementing mean?
Well Cementing is a process in which cement slurry is introduced to 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 Well Cementing
There are two types of Well Cementing, i.e., primary and secondary cementing.
Primary Cementing- In Primary Cementing process, cement slurry, cement additives and water are mixed and pumped down through open hole below casing string. The main functions of primary cementing are to:
- Restrict liquid movement between hydrocarbon formations and the surface.
- Bolster the well casing.
- Prevent pollution of fresh water zones with that of Crude Oil or Gas once production starts from a developed well.
- Make casing corrosion free.
Secondary (Remedial) Cementing- As the name suggests, remedial cementing is performed to rectify primary cementing jobs, if any. There are two types of remedial cementing are performed in the oil and gas industry:
- Squeeze Cementing
- Plug Cementing