FLUIDSTROEMSTYRING I OLJEBROENNER

摘要

A device is provided for controlling fluid flow in oil well casings (19) or drill pipes (91). The device defines a flowpath for fluid through a casing section (19) or drill pipe (91) with the flowpath including a throttling valve (24,47) which restricts or prevents the flow of fluid therethrough. This can be used to prevent U-tubing in casings or can be used to locate leaks in drill pipes (91) or can be used to monitor the position of successive fluids of differing viscosities in a casing string.