Mechanism of Cement Stone Damage by Hydrogen Sulfide in Oil and Gas Wells
Agzamov F. Moldabayeva G. Syzdykov A. Buktukov N.S. Tileuberdi N. Bakesheva A. Baluanov B.
June 2025Engineered Science Publisher
ES Materials and Manufacturing
2025#28
Hydrogen sulfide is the most aggressive to cement stone. It can be in gaseous or dissolved in formation fluid state. The mechanism of damage to cement stone depends on the state of hydrogen sulfide. Thermodynamic calculations have shown that most cement hardening products are unstable to hydrogen sulfide. The most stable: calcium carbonate, low-basic silicates (tobermorite, xonotlite); the least stable: calcium hydroxide, high-basic hydrosilicates. Contact with gaseous hydrogen sulfide causes volumetric destruction of cement stone, despite the excess of pore volume compared to corrosion products. Only 3-10% of the hardening products enter into a chemical reaction. This shows that corrosion products accumulate only in pores of a certain size, leading to the occurrence of internal stresses in them. This mechanism of cement stone destruction in gaseous hydrogen sulfide is valid when hydrogen sulfide interacts with stone having pH ≥ 12.0. When the pH is reduced to ≤ 11 and a certain CaO/SiO₂ ratio, equilibrium is eventually reached, and the corrosion process stops. Hydrogen sulfide dissolved in water causes acid corrosion, which consists in mutual destruction of calcium hydroxide and hydrogen sulfide. All types of plugging materials with hardening products having an alkaline reaction are unstable in a dissolved hydrogen sulfide.
Basicity of hardening products , Cement stone , Hydrogen sulfide , Inhibition of pores , Mechanism of destruction
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Oil and gas mining department, Ufa State Petroleum Technological University, Ufa, 450064, Russian Federation
Non-profit joint-stock company «K.I. Satbayev Kazakh National Research Technical University», Satbayev University, Almaty, 050013, Kazakhstan
Institute geological sciences n/a K.I. Satpayev, Satbayev University, Ualikhanov st. 69, Alamty, 050000, Kazakhstan
Mining Institute named after D.A. Kunaev, Almaty, 050013, Kazakhstan
Department of Hydrogeology, Engineering and Oil and Gas Geology, Satbayev University, Satbayev st. 22a, Almaty, 050013, Kazakhstan
Oil and gas mining department
Non-profit joint-stock company «K.I. Satbayev Kazakh National Research Technical University»
Institute geological sciences n/a K.I. Satpayev
Mining Institute named after D.A. Kunaev
Department of Hydrogeology
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