Cementing

After drilling a well, steel pipe called casing is inserted into the hole. Cement is pumped down this pipe and up the annulus between the pipe and the newly drilled hole. Three main functions are served by cementing the casing in place:

1. Casing support – a well-placed column of good quality cement helps to support the weight of the column of casing in the hole.
2. Annular isolation (the most important function) - provides isolation between zones in the wellbore, thereby protecting both production and fresh water zones from cross-contamination.
3. Casing protection – a column of cement will protect the casing from corrosion, collapse, and damage during drill out.

In most wells, at least two strings of casing are run: one near the surface called “surface casing” and a second across the producing zone called “production casing”. In some deeper wells, up to four strings are run. Trican cements all the casing strings in the well and will often travel to the well two to four times while it is drilled.

Remedial cementing is another form of cementing that repairs casing leaks and communication between zones. This enables our customers to repair a number of different problems in a well.

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