Coupon holder for corrosion test downhole in a borehole

Details Coupon holder for corrosion test downhole in a borehole Coupon holder for corrosion test downhole in a borehole

1990-04-10

1992-03-17

Lacey, David L.

Wells

Combined

422 53, 73 53, 73 86, 166902, E21B 4700

Patent

active

050959778

ABSTRACT:
A coupon holder apparatus for measuring the rate of corrosion caused by formation fluid contained downhole in a borehole. The apparatus is useful when used in conjunction with a pumping unit of the type having a pump located at the bottom of a borehole and a sucker rod string extending downhole through a tubing string to actuate the pump. The apparatus has a main body which is connected in the rod string and suspended downhole in the borehole where it is in contact with the well fluids. An axial chamber is formed within the main body and radial ports extend through a sidewall of the main body to communicate the axial chamber with the borehold fluids. A coupon that chemically reacts with the well fluids is mounted within the chamber and is insulated from the interior sidewall of the chamber so that well fluid makes contact with the coupon, and the coupon reacts with the well fluid, to enable the rate of reaction between the coupon and the well fluid to be measured and used as an indication of the rate of corrosion.

REFERENCES:
patent: 2994778 (1961-08-01), Marsh
patent: 3451264 (1969-06-01), Kaston
patent: 4483397 (1984-11-01), Gray
patent: 4501323 (1985-02-01), Lively et al.
patent: 4603113 (1986-07-01), Bauer
patent: 4605065 (1986-08-01), Abercrambie
patent: 4688638 (1987-08-01), Williams
patent: 4697465 (1987-10-01), Evans et al.
patent: 4768373 (1988-09-01), Spencer
patent: 4928760 (1990-05-01), Freitas

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