Definition - What does Bow-Spring Centralizer mean?
Bow-Spring Centralizer is a bow-shaped metal strip used to centralize the casing in a borehole so as to improve the efficiency of cementing. If the casing is touching the formation at any part of the hole, then cement slurry would not pass through the area of contact resulting in a poor cementing job. These types of centralizers have coiled tubing whose residual curvature forces the end of the tool against the well’s casing making it centrally aligned in the well casing.
Petropedia explains Bow-Spring Centralizer
Centralizers are used in a wellbore so as to get the primary cementing job done effectively. A Bow-Spring Centralizer helps in the even distribution of cement slurry in the casing string. There are two types of Bow-Spring Centralizers:
- 1. Welded Bow-Spring Centralizers – These centralizers can be slip-on or hinged type centralizers. As name suggests such type of centralizers can be slipped or hinged in the well casing.
- 2. Non Welded Bow-Spring Centralizers – These types of centralizers are available only in hinged type. The bow springs in the centralizers are not welded to the end rings.
All centralizers are designed and manufactured as per API 10D Specifications.
The following are some of the advantages of using Bow-Spring Centralizers:
- Even cement slurry distribution in casing
- They minimize casing drag during casing running operations
- They prevent differential sticking
- They can be put inside any diameter hole as they are manufactured in various sizes.