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51312-01207-High Pressure High Temperature Testing of PH Nickel Alloy and Super Martensitic Stainless Steel in C

Picture for High Pressure High Temperature Testing of PH Nickel Alloy and Super Martensitic Stainless Steel in C
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Product Number: 51312-01207-SG
ISBN: 01207 2012 CP
Author: Eugenio Lo Piccolo
Publication Date: 2012
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$20.00
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The use of high density brine is required for high pressure high temperature (HPHT) gas condensate wells to ensure safe well operations during drilling and completion phases. Caesium formate brine is one of the latest high-density brine used for this application being both environmentally friendly and non-corrosive. The present work investigated the use of high density Caesium/Potassium Formate brine solution at bottom hole environmental conditions for long term exposure periods. In particular the influence of total pressure and temperature on the thermal degradation of the Formate-bases brine was studied and evaluated. The results of the testing program demonstrated that thermal decomposition of the fluid occurred producing a build up of the internal pressure in the low pressure tests only with a development of hydrogen into the gas phase. Furthermore SCC phenomenon was observed in super martensitic stainless steel samples at certain stress levels together with evidence of hydrogen embrittlement of PH Ni alloy 718. A mechanism for the reactions involved in this brines thermal degradation is proposed and discussed. Key words: Caesium formate general corrosion localised corrosion Stress Corrosion Cracking (SCC) heavy brines CRA’s supermartensitic stainless steel PH nickel alloys hydrogen embrittlement HPHT thermal degradation completion fluids.
The use of high density brine is required for high pressure high temperature (HPHT) gas condensate wells to ensure safe well operations during drilling and completion phases. Caesium formate brine is one of the latest high-density brine used for this application being both environmentally friendly and non-corrosive. The present work investigated the use of high density Caesium/Potassium Formate brine solution at bottom hole environmental conditions for long term exposure periods. In particular the influence of total pressure and temperature on the thermal degradation of the Formate-bases brine was studied and evaluated. The results of the testing program demonstrated that thermal decomposition of the fluid occurred producing a build up of the internal pressure in the low pressure tests only with a development of hydrogen into the gas phase. Furthermore SCC phenomenon was observed in super martensitic stainless steel samples at certain stress levels together with evidence of hydrogen embrittlement of PH Ni alloy 718. A mechanism for the reactions involved in this brines thermal degradation is proposed and discussed. Key words: Caesium formate general corrosion localised corrosion Stress Corrosion Cracking (SCC) heavy brines CRA’s supermartensitic stainless steel PH nickel alloys hydrogen embrittlement HPHT thermal degradation completion fluids.
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