Heavy wall casing in C110 grade for sour service

Conference · Thu Dec 31 04:00:00 EST 1998

OSTI ID:351740

Linne, C P; Blanchard, F; Puissochet, F ^[1]; Orlans-Joliet, B J; Hamilton, R S

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1. Vallourec Research Center, Aulnoye Aymeries (France). Corrosion and Metallurgical Dept.

The recent developments of high pressure and sour wells in the North Sea area have increased the need for high strength H{sub 2}S resistant carbon steels. Steel chemistry and heat treatment solutions have been available to provide products suitable for use in these environments within the constraints of classic well design since the early 90`s but operators are now demanding higher strength and heavier wall products for HPHT wells. Well completion design teams are now specifying from OCTG suppliers C110 grade products in increasingly heavy wall and the challenge facing suppliers is to guarantee product integrity not only of these heavy wall casing but also the associated coupling stocks. This paper was aimed at evaluating the performances of thick walled C110 tubulars (up to 2in) for sour environments. Metallurgical characteristics (microstructure, structure, microhardness), mechanical properties (hardness, tensile, toughness), Sulfide Stress Cracking resistance (smooth tensile, DCB) have been investigated throughout the wall thickness. The C110 proprietary grade proved to be an excellent material for use as Oil Country Tubular Goods (OCTG) in typical North Sea environments with improved assessment of H2S corrosion resistance properties according to both NACE and EFC (European Federation of Corrosion) philosophies.

• OSTI ID: 351740
• Report Number(s): CONF-980316--
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
03 NATURAL GAS
36 MATERIALS SCIENCE
CARBON STEELS
CORROSION RESISTANCE
CRACK PROPAGATION
FIELD PRODUCTION EQUIPMENT
HYDROGEN SULFIDES
MECHANICAL PROPERTIES
MICROSTRUCTURE
NATURAL GAS WELLS
NORTH SEA
OIL WELLS