A more thorough explanation:

Definition: Casing point refers to the point in the drilling process of an oil or gas well where the desired depth has been reached. At this point, the owners of the well must decide whether to place production pipe, known as "casing," in the hole to complete and equip the well for production.

Example: Imagine a team of oil and gas workers drilling a well. They have been drilling for weeks, and finally, they reach the desired depth. At this point, they must decide whether to place casing in the hole to complete the well for production. This decision is known as the casing point.

Another example: In another scenario, a team of oil and gas workers may decide not to place casing in the hole at the casing point. Instead, they may decide to abandon the well and move on to another location.

These examples illustrate how the casing point is a critical decision point in the drilling process of an oil or gas well. It marks the end of the drilling process and the beginning of the production process, where the well is equipped for production or abandoned.