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Reactive transport modeling (RTM) is applied to simulate ion sulfide scaling - a problem for oil and gas production from sour reservoirs. Results reveal spatial and temporal distribution of iron-bearing scale precipitation, wormhole formation, and reservoir pressure/ water chemistry evolution.
Iron sulfide scaling has been a persistent problem for oil and gas production from sour reservoirs. To study iron sulfide deposition in near-wellbore formations, an advanced numerical geochemical method, reactive transport modeling (RTM), is applied in this paper to simulate the iron-bearing scale formation, especially during and post acid stimulation. The code Toughreact is used for simulation. The model results allow an insight into the spatial and temporal distribution of iron-bearing scale precipitation, wormhole formation, as well as reservoir pressure and water chemistry evolution.
Results of an acid treatment scenario in a hypothetical high H2S carbonate reservoir demonstrate that the scales tends to be concentrated in the wormholes. Pyrrhotite and siderite are the most abundant Fe-bearing scales. However, the latter will gradually convert to the former during the normal production stage. The acid selectively dissolves calcite while leaving the dolomite component largely undissolved. FeCO3 (e.g., siderite) as a form of Fe-bearing scale is recognized in this study. This new understanding will contribute to optimizing acid treatment design and formulation for iron-bearing scale prevention in sour gas wells.
Key words: iron sulfide, oilfield scale, acid stimulation, numerical modeling
A polyethylene unit experienced a gas leak within a high pressure tube and shell heat exchanger. Failure analysis revealed that the tube wall loss was beneath residual deposits. Preventative measures and improvements in inspection & cleaning procedures are discussed.
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A risk assessment model developed as part of a holistic study conducted to evaluate the condition of subsea pipelines. A systematic semi-quantitative risk-based model was developed to identify, analyze and evaluate risk associated with each subsea pipeline.
The paper summarizes the theoretical and test programs to validate the aluminum cladding solution – developed to overcome sulfide stress corrosion problems in high strength steel armors in H2S/CO2 containing environment.