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51318-10969-Qualification of Scale Dissolver Acid Systems for 3CR Alloyed Steel and 13CR Stainless Steels Well Materials

Picture for Qualification of Scale Dissolver Acid Systems for 3CR Alloyed Steel and 13CR Stainless Steels Well Materials
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A corrosion testing program was performed aimed at evaluating scale dissolver packages to determine which package(s) were least corrosive and acceptable for use in wells constructed with 3Cr80 alloyed steel and L80 13 Cr (API 5CT grade) (1) tubulars.

Product Number: 51318-10969-SG
Author: Lucrezia Scoppio / Emilia Imbimbo / Sten Axelsen / Perry Nice / Giuseppe Mortali
Publication Date: 2018
Industry: Corrosion Monitoring and Control
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Acid systems are used to improve productivity through either near-wellbore damage removal or through dissolving scale inside the wellbore during production. This paper describes the qualification methodology applied in the search for effective scale dissolvers/stimulation fluids with low corrosivity. The identification of suitable acid systems is becoming increasingly more challenging. Furthermore, the operators try to lower the cost of the acid treatment itself. This may be achieved through optimization of the inhibitor package, which constitutes a significant part of the chemical cost.

A corrosion testing program was performed aimed at evaluating scale dissolver packages to determine which package(s) were least corrosive and acceptable for use in wells constructed with 3Cr80 alloyed steel and L80 13 Cr (API 5CT grade) (1) tubulars. Laboratory exposure corrosion tests were carried out at 60°C and 80°C. The scale dissolver packages consisted of 7.5%HCl, 15%HCl and 28%HCl including corrosion inhibitor packages. The main challenge was to optimize the acid formulation for 3Cr 80 alloyed steel. There is only limited data available for this material. Corrosion resistance of the tested alloys was evaluated in terms of mass loss and localized corrosion. The results of this program successfully identified the optimized scale dissolver packages for both 3Cr80 alloyed steel and L80 13 Cr (API 5CT grade), respectively.

Key words: Matrix acidizing, L80 13 Cr (API 5CT grade) (1), 3Cr alloyed steel, scale dissolver, HCl.

Acid systems are used to improve productivity through either near-wellbore damage removal or through dissolving scale inside the wellbore during production. This paper describes the qualification methodology applied in the search for effective scale dissolvers/stimulation fluids with low corrosivity. The identification of suitable acid systems is becoming increasingly more challenging. Furthermore, the operators try to lower the cost of the acid treatment itself. This may be achieved through optimization of the inhibitor package, which constitutes a significant part of the chemical cost.

A corrosion testing program was performed aimed at evaluating scale dissolver packages to determine which package(s) were least corrosive and acceptable for use in wells constructed with 3Cr80 alloyed steel and L80 13 Cr (API 5CT grade) (1) tubulars. Laboratory exposure corrosion tests were carried out at 60°C and 80°C. The scale dissolver packages consisted of 7.5%HCl, 15%HCl and 28%HCl including corrosion inhibitor packages. The main challenge was to optimize the acid formulation for 3Cr 80 alloyed steel. There is only limited data available for this material. Corrosion resistance of the tested alloys was evaluated in terms of mass loss and localized corrosion. The results of this program successfully identified the optimized scale dissolver packages for both 3Cr80 alloyed steel and L80 13 Cr (API 5CT grade), respectively.

Key words: Matrix acidizing, L80 13 Cr (API 5CT grade) (1), 3Cr alloyed steel, scale dissolver, HCl.

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