Casing inspection checks the integrity of a casing to find holes, cracks, or any corroded areas there may be in the casing. It also detects any scale or bacterial buildup there may be. Casing failure can be caused by deformation, physical wear, or corrosion and can seriously impede well production. Casing inspections are important to ensure that a well continues to work properly and prolong its life. Inspections should be done annually and the well owners, in between inspections, should continue to monitor it themselves for any kind of problems that could arise. You don’t want to experience any loss of capacity or pressure, which means the well might not be producing as much water as it should be. Casings are hollow steel pipes that are used to line the inside of a wellbore. Casings, when maintained and kept in good shape, ensure that the well and water are protected and safe. Casings prevent contamination and provide a foundation for deeper drilling.
There are many different kinds of casings. Conductor casings, surface casings, intermediate casings, production casings, and production liners. Ultrasonic imaging tools are used to evaluate external or internal corrosion. Electromagnetic corrosion and protection tools measure the casings resistance in wells and helps determine the amount of corrosion that is present. Companies use inspection logs to note these findings. Two other common techniques used for casing inspection are cased-hole calipers and flux-leakage tools. The log will display any visible holes in the casing as well as any other deformities that are present. Cased-hole calipers determine any changes in the casings diameter which could be a result of damage due to wear and corrosion. Flux-leakage tools are a magnetic method of testing that detects corrosion and pitting in pipelines.
The log is a record of the casing’s thickness and integrity. The log will also allow a company to determine the extent of any damage that is present and determine what costs will be involved in making the necessary repairs. Casing Inspection is an integral part of the overall welfare of a well. Casing is a big cost and the necessary steps should be taken to maintain and protect it and ensure that the well continues to properly function. Casing inspection logs are vital to tracing mechanical damage and lowering the costs that would be associated with any damage as long as they are regularly maintained.