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Uniform CO2 corrosion in Saint Marcet (France) (CO2 corrosion on Carbon steel/cast iron in Water (produced with oil & gas) on a Piping/pipe line)
The corroded surface is extremely smooth, quasi polished. The corrosion rate estimated from the last inspection is 2 mm/y during 2 years. ...
Download case: 120 Ko 

 

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Localised CO2 corrosion (CO2 corrosion on Carbon steel/cast iron in Water (produced with oil & gas) on Tubing/casing)
In North America, CO2 corrosion is often encountered in the gas condensate fields of the Gulf area (Texas and Louisiana), i.e. in wells with a large flow velocity. Hence the temptation to ascribe these localised ...

Download case >: 601 Ko 
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Two-gear CO2 corrosion in a self gas-lifted oil well (CO2 corrosion on Carbon steel/cast iron in Water (produced with oil & gas) on Tubing/casing)
Its sulfur content was even rather low for that time. The microstructure is a tempered martensite with a fine grain size, and nothing can therefore be blamed in this steel. ...

Download case: 189 Ko 
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Protectiveness of corrosion layers and selective dissolution in CO2 corrosion (CO2 corrosion on Carbon steel/cast iron in Water (produced with oil & gas) on Tubing/casing)
Beside empty cementite, three other types of corrosion layers may also be induced in relationship with the precipitation of an iron salt. The salt presently involved in CO2 corrosion is siderite, a rhombohedral crystalline solid ...

Download case: 381 Ko
 

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CO2 corrosion of a weld (CO2 corrosion on Carbon steel/cast iron in Water (produced with oil & gas) on a Piping/pipe line)
Figure 1 shows a genuine selective dissolution of the weld beam, which is excavated from the inside within the wall thickness, whereas the weld surface remains intact and no internal corrosion is occuring elsewhere. ...

Download case: 146 Ko 
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Use of tubing in 13 % Cr stainless steel (Multifaceted or indirect Corrosion on Stainless steels in Water (produced with oil & gas) on a Tubing/casing)
The very first 13 % Cr tubings were ordered in 1977 with the usual specifications for tubings, what they were, simply complemented by a clause of stainless steel composition. They were therefore delivered with ...

Download case: 487 Ko 
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SSC failure of a flapper valve axle in 17-4 PH stainless steel (Sulfide stress cracking (SSC) Corrosion on Stainless steels in Water (produced with oil & gas) in Pumps/Valves)
In some places, the metal is totally shattered (Fig. 1), with a network of brittle intergranular cracks. In this context of high severity sour service and high sensitivity of 17-4PH, this cannot be but sulfide ...

Download case: 44 Ko  
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Fatigue of a pump shaft (Fatigue on Stainless steels in Oil on Pumps/Valves)
The metal is a martensitic stainless steel, of the type 15 Cr-4Ni-1 Mo, meeting the technical brochure of the material supplier ...

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