During oil drilling, sometimes parts break and remain inside the wellbore. These broken pieces are called junk. Many people ask how we can remove these pieces from the well. Since drilling cannot continue if these broken parts remain inside, we need to use a special operation called a fishing job, which involves tools designed to retrieve such junk from the well. These tools come in different types, and two of them are: • Spear – used to catch and pull out tubular parts. • Junk Basket – used to

Types Of Casing In Drilling Oilfield Wells - Drilling Manual