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How An Inner Wall Casing Scraper Operates

by Phil Lawrence

An underground well may contain inner walls that are constructed of cement or steel. The age of a well and the size of the wellbore may restrict access to sediment that has become caked along a well's interior. An inner wall casing scraper is a tool that can be used after an oil or gas recovery process has taken place. It can also be used to upgrade the condition of a water well.

A Scraper's Purpose

A scraper will consist of a headpiece, an extension handle, and a blade. The blade will likely contain a serrated edge or bristle extensions. The sharp or stiff protrusions that extend from a casing scraper will penetrate limescale, calcium buildup, and other hardened sediment types that have become attached to the interior of a well.

Older wells that are being refurbished may contain an excessive amount of debris in them, especially if the wellbore covering has remained open and debris has fallen into the hole. The design of a well and its depth may make it difficult or impossible for someone to clean the interior by hand. With the use of a scraper, each interior piece will be cleaned in a consistent manner.

Specialized Features

A chain and hook setup or a scraper that contains an expandable feature will allow a technician to extend the end of a scraper deep into a well. To adequately remove buildup from interior walls, an end-user should be able to control the scraper ending from ground level. Casing scrapers may be manually or electrically operated. Before a cleaning process takes place, an inspection of the well should be performed.

This involves assessing the wellbore opening and the land that surrounds it. The ground that surrounds a well should be compacted and stable. This will allow a cleaning process to be conducted safely and efficiently.

All of the equipment that is needed to operate a casing scraper should be removed from a service vehicle and set up. During this process, a service technician should check the blade of a scraper and its extension pieces. Each piece that comes with a scraper may be attachable. Some scraper blades may rotate. The rotation process can be used when accessing a well that is large or hasn't been serviced in a long time. As the blade rotates, it will provide excessive pressure to interior walls, removing layers of buildup in their entirety.

For more information on inner wall casing scrapers, contact a local professional.