Casing scrapers are not new technology. A quick search on Google patents will bring up hundreds of types of scrapers dating back to the 1930s. In this post we will explore the evolution of this wellbore cleaning tool.
At school, we learned the three Rs: reading, writing and arithmetic. There are also three Rs of wellbore clean-up, namely Rotation, Reciprocation and ciRculation. So sit up straight, pay attention and spit out that gum because today you are going back to school.
As the old adage goes, a chain is only as strong as its weakest link and drill strings are no exception. Each component of the string, from the drill pipe, collars, stabilizers to the BHA tools, has a connection – a potential weak point that can break – so when it comes to connections, less is more.
The use of magnets has proven to be a simple, cheap and effective way of removing metal debris from a well. Every WBCU operation should include magnets.
Premature completion failure caused by debris interfering with valves, electronics and hardware is an ever-present threat. A robust clean up of the BOP and riser is proven to reduce this threat and the non-productive time during the completion of the well. By careful planning and the use of modern, effective methods, your pre-completion clean-up process will save you time and money.