Comparison of Surfactant-Polymer and Polymer Flooding in a High Temperature Sandstone Reservoir
| Autor: | Muhammad Syafwan, Will S. Slaughter, Robert Matthew Dean, Sophany Thach, Andrew Armpriester, Varadarajan Dwarakanath, Bambang Nursyahid, Taimur Malik, Dwight Meaux, Agus Masduki |
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| Rok vydání: | 2020 |
| Předmět: |
chemistry.chemical_classification
020401 chemical engineering Chemical engineering chemistry Pulmonary surfactant Polymer flooding Environmental science 02 engineering and technology Polymer 0204 chemical engineering 010502 geochemistry & geophysics 01 natural sciences 0105 earth and related environmental sciences |
| Zdroj: | Day 1 Mon, August 31, 2020. |
| Popis: | Results from two field trials designated as Minas Surfactant Field Trial 2 (SFT2) and Polymer Field Trial (PFT) are presented. Quantitative tracer interpretations were used to estimate sweep and displacement efficiency and confirm the performance of both SFT2 and PFT. The pilot patterns in both SFT2 and PFT consisted of a central producer surrounded by six chemical injectors and further confined by six hydraulic control wells that injected water alone. In order to make quantitative comparisons, both the surfactant-polymer and polymer pilots were run at the same mobility ratios to understand if incremental recovery was a function of improved volumetric sweep or increased displacement sweep efficiency. The results of the two pilots show that at the same well spacing and mobility ratio, incremental sweep is very similar and significantly higher than pre-chemical waterfloods. An important finding of the tracer tests is that water injectors should not be used to confine chemical injectors as the water tends to bypass the higher viscosity polymer chase and potentially disrupts the oil-bank. The results from the pilots indicate that for a mature, waterflooded reservoir, surfactant-polymer flooding was preferable as it lowered the final remaining oil saturation and increased oil recovery. Polymer flooding mainly accelerated oil recovery by recovering additional oil from unswept zones and had minimal impact in a mature reservoir. Interwell tracer technology combined with moment analyses were used to make quantitative comparisons of both processes and allowed for several technical insights. This is the first time in literature that a quantitative comparison of surfactant-polymer flooding and polymer flooding alone has been presented. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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