Definition - What does Casing Valve mean?
A Casing Valve is a device that is fitted to the well casing during the well completion stage to hold the casing tube tightly and allow the movement of non-usable and non-producing casings inside the borehole. It is also, used as a flow control device. This valve is installed in the wellhead assembly so that it can enable access to the annulus of the casing.
Petropedia explains Casing Valve
Valves are used in many industrial applications to control, regulate and direct the flow of liquids and gases in pipelines. A casing valve is installed just above the top most portions of the wellbore where casing starts. This valve forms an integral part of wellhead assembly. A casing is a steel pipe used in the drilling operation to prevent the wall of a drilled hole from carving in, so as to allow drilling of the next section safely and protect the potable water from contamination (land operations). The casing also prevents the movement of formation fluids allowing the reservoir sands to be cased safely. This enables the oil and gas to be produced to the surface safely through completion tubing.