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97013 EXPERIENCES IN THE DESIGN OF CRA'S FOR EROSION/CORROSION CONTROL IN THE PRODUCTION FACILITIES OF EASTERN VENEZUELA OIL FIELDS

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Product Number: 51300-97013-SG
ISBN: 97013 1997 CP
Author: Noelis Romero, Carlos A. Palacios
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It is a well known fact that CRA'S are used in the oil industry as one way to control erosion/corrosion effects. Many fields in the eastern region of Venezuela are considered corrosive due to the presence of CO2 (5 to 20%), H2S (up to 5 ppm), and water (50% water cut) contained in the produced hydrocarbons (condensate). for some areas, the hydrocarbon is accompanied by sand, making them erosive as well. These conditions and frequent failures experienced in the field, led to he use of the use CRA'S. For the wells, 13% Cr and bimetallic (carbon steel/13% Cr) tubing was used for 51 condensate wells containing 5 to 20% CO2. For the surface equipment (valves, reducers, expanders and other types of fittings) tungsten carbide hard facing were used, for some other valves, a epoxi-phenolic coating was used. This article describes the different design criteria used for the installation of the tubing, the logistics involved during field inspections and handling tips to avoid galling during workovers. It also, presents results from the hi-metallic tubing and the hard facings used for the surface equipment. Keywords: Gas/Oil wells, wellbore corrosion, choke valve erosion, manifold corrosion, bimetallic tubing, integral corrosion control, 13% Cr tubing, galling.
It is a well known fact that CRA'S are used in the oil industry as one way to control erosion/corrosion effects. Many fields in the eastern region of Venezuela are considered corrosive due to the presence of CO2 (5 to 20%), H2S (up to 5 ppm), and water (50% water cut) contained in the produced hydrocarbons (condensate). for some areas, the hydrocarbon is accompanied by sand, making them erosive as well. These conditions and frequent failures experienced in the field, led to he use of the use CRA'S. For the wells, 13% Cr and bimetallic (carbon steel/13% Cr) tubing was used for 51 condensate wells containing 5 to 20% CO2. For the surface equipment (valves, reducers, expanders and other types of fittings) tungsten carbide hard facing were used, for some other valves, a epoxi-phenolic coating was used. This article describes the different design criteria used for the installation of the tubing, the logistics involved during field inspections and handling tips to avoid galling during workovers. It also, presents results from the hi-metallic tubing and the hard facings used for the surface equipment. Keywords: Gas/Oil wells, wellbore corrosion, choke valve erosion, manifold corrosion, bimetallic tubing, integral corrosion control, 13% Cr tubing, galling.
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