Survey of boreholes or wells (monitoring pressure or flow of drilling fluid E21B21/08)

Child Classifications

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• E21B 47/001 for underwater installation
• E21B 47/002 by visual inspection
• E21B 47/003 Determining well or borehole volumes
• E21B 47/005 Monitoring or checking of cementation quality or level
• E21B 47/006
• E21B 47/007 Measuring stresses in a pipe string or casing (for locating blocked portions of pipes E21B47/09)
• E21B 47/008 Monitoring of down-hole pump systems, e.g. for the detection of "pumped-off" conditions
• E21B 47/01 Devices for supporting measuring instruments on drill bits, pipes, rods or wirelines; Protecting measuring instruments in boreholes against heat, shock, pressure or the like
• E21B 47/02 Determining slope or direction
• E21B 47/04 Measuring depth or liquid level
• E21B 47/06 Measuring temperature or pressure
• E21B 47/08 Measuring diameters or related dimensions at the borehole
• E21B 47/09 Locating or determining the position of objects in boreholes or wells ; Identifying the free or blocked portions of pipes
• E21B 47/10 Locating fluid leaks, intrusions or movements
• E21B 47/12 Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
• E21B 47/26 Storing data down-hole, e.g. in a memory or on a record carrier