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Class Information
Number: 166/250.01
Name: Wells > Processes > With indicating, testing, measuring or locating
Description: Process including a step of: providing evidence of a condition; e.g., leak, oil-gas interface; performing an analysis; e.g., downhole pressure; counting; or determining the position of an object or formation.

Sub-classes under this class:

Class Number	Class Name	Patents
166/250.15	Automatic control for production	196
166/250.07	Bottom hole pressure	119
166/250.03	Determining fluid interface or fluid level	62
166/254.1	Determining position of earth zone or marker	48
166/255.1	Determining position of object in well	105
166/250.13	Determining stuck point	10
166/250.1	Fracturing characteristic	136
166/250.11	Holder for coupon or sensor	57
166/250.09	Impression means	25
166/251.1	Including in situ combustion	53
166/252.1	Including production of earth fluid by driving fluid	78
166/250.17	Including testing or treating tool having at least one actuatable packer	118
166/253.1	Indicating the location, presence, or absence of cement	36
166/250.08	Leak testing or locating	60
166/250.14	Of cementing or plugging technique	62
166/250.02	Permeability determining	58
166/250.04	Plug indicating or releasing	11
166/250.16	Prospecting	39
166/250.05	Scale or corrosion determination	17
166/250.06	Steam quality	7
166/250.12	Tracer	47

Patents under this class:

1 2 3 4 5 6 7 8 9 10 11

Patent Number	Title Of Patent	Date Issued
4006777	Free floating carrier for deep well instruments	Feb. 8, 1977
3973626	Well completion in permafrost	Aug. 10, 1976