Coupon holder for corrosion test downhole in a borehole

Patent · Tue Mar 17 04:00:00 EST 1992

OSTI ID:5251156

Ford, M B

This patent describes a wellbore having a downhole pump at the lower end of a production tubing string, a sucker rod string positioned within a production tubing and connected to reciprocate the downhole pump, the combination with the sucker rod string of an apparatus for measuring the rate of corrosion downhole in the borehole. It comprises a main body having opposed ends, means for forming a connection at the opposed ends by which the main body is series connected within the rod string to thereby suspend the apparatus downhole in the borehole, and further comprising; an axial chamber formed by an interior wall surface in the main body; radial ports extending through a sidewall of the main body and communicating the axial chamber with the exterior of the main body; wherein, the radial ports are oblated and include a lower curved end which is sloped downwardly and outwardly with respect to the longitudinal axis whereby reciprocation of the apparatus forces well fluid to flow through the chamber into contact with the coupon; the main body being comprised of an upper member and a lower member; means threadedly attaching the upper and lower members together in a removable manner; the chamber being a bore formed in the lower member; the insulating means being mounted to an end wall of the upper member; the end wall also defining the upper end of the chamber, the coupon extending downwardly into the bore formed in the lower member.

• Assignee: NOV; EDB-92-101172; NOV-92-028100
• Patent Number(s): US 5095977; A
• Application Number: PPN: US 7-508026
• OSTI ID: 5251156
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
023000 -- Petroleum-- Properties & Composition
36 MATERIALS SCIENCE
360105 -- Metals & Alloys-- Corrosion & Erosion
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
CONTROL
CORROSION
CORROSIVE EFFECTS
DRILLING EQUIPMENT
DRILLING FLUIDS
EQUIPMENT
FLUIDS
OIL WELLS
PERFORMANCE TESTING
SCALE CONTROL
TESTING
WELLS