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00160 QUALIFICATION OF Ti-6AI-4V-Ru ALLOY PRODUCTION TUBULARS FOR AGGRESSIVE FLUORIDE-CONTAINING MOBILE BAY WELL SERVICE

Picture for 00160 QUALIFICATION OF Ti-6AI-4V-Ru ALLOY
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Product Number: 51300-00160-SG
ISBN: 00160 2000 CP
Author: R.W. Schutz, R.L. Porter, and J.M. Horrigan
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Ti-6AI-4V-Ru alloy (102 mm [4"] OD) seamless p i p was evaluated as candidate production string tubulars for a specific Mobile Bay Field producing corrosive NaCI- and CaF2-saturated sour brines at 210°C (410°F). The extensive qualification test program, which was mandated by a major Mobile Bay gas producer, included assessment of long-term pipe property and metallurgical stability at well temperature, and long-term corrosion resistance in this sour production brine, injected organic acidizing solutions, liquid scale inhibitor, and methanol solvent for hydrate control; in addition to resistance to NaBr brine completion/packer fluids when coupled to steel casing under sour conditions. Test results, documented herein, revealed that this Ti-6AI-4V-Ru pipe exhibited good long-term thermal stability in metallurgy and mechanical properties consistent with all specification requirements; and acceptable, exceptional resistance to all forms of corrosion and embrittlement in all specific well environments tested. The only exception was the expected susceptibility of the Ti alloy pipe to SCC in water-lean methanol solutions, which is addressed by ensuring that the methanol contains at least 7-10 wt.% water prior to well injection. Based on this sound, relevant property database and the exceptional corrosion resistance of this pipe to anticipated worst-case well service conditions, Ti-6AI-4V-Ru alloy pipe is considered to be a viable, suitable, and attractive alternative for production tubing strings in sour, fluoride-containing Mobile Bay gas wells. Keywords: sour gas, downhole, production tubulars, Mobile Bay, titanium alloys, corrosion resistance, stress corrosion cracking, mechanical properties, hydrogen, methanol
Ti-6AI-4V-Ru alloy (102 mm [4"] OD) seamless p i p was evaluated as candidate production string tubulars for a specific Mobile Bay Field producing corrosive NaCI- and CaF2-saturated sour brines at 210°C (410°F). The extensive qualification test program, which was mandated by a major Mobile Bay gas producer, included assessment of long-term pipe property and metallurgical stability at well temperature, and long-term corrosion resistance in this sour production brine, injected organic acidizing solutions, liquid scale inhibitor, and methanol solvent for hydrate control; in addition to resistance to NaBr brine completion/packer fluids when coupled to steel casing under sour conditions. Test results, documented herein, revealed that this Ti-6AI-4V-Ru pipe exhibited good long-term thermal stability in metallurgy and mechanical properties consistent with all specification requirements; and acceptable, exceptional resistance to all forms of corrosion and embrittlement in all specific well environments tested. The only exception was the expected susceptibility of the Ti alloy pipe to SCC in water-lean methanol solutions, which is addressed by ensuring that the methanol contains at least 7-10 wt.% water prior to well injection. Based on this sound, relevant property database and the exceptional corrosion resistance of this pipe to anticipated worst-case well service conditions, Ti-6AI-4V-Ru alloy pipe is considered to be a viable, suitable, and attractive alternative for production tubing strings in sour, fluoride-containing Mobile Bay gas wells. Keywords: sour gas, downhole, production tubulars, Mobile Bay, titanium alloys, corrosion resistance, stress corrosion cracking, mechanical properties, hydrogen, methanol
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