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Study on the Performance Degradation of Sandstone under Acidification
Hao Li1, Yongmin Shi1,2
1Shaanxi Key Laboratory of Chemical Additives for Industry, College of Chemistry and Chemical Engineering, Shaanxi University of Science and Technology, 710021 Xi'an, China.
Dibasic acids, like hydrochloric and acetic acid, are most effective for sandstone acid fracturing in oil production. They significantly reduce rock strength and quality, improving oil recovery.
Area of Science:
- Petroleum Engineering
- Geochemistry
- Materials Science
Background:
- Acid fracturing is a key technique for enhancing oil production from sandstone reservoirs.
- Understanding acid-rock interactions is crucial for optimizing fracturing operations.
- The study focuses on hydrochloric, acetic, and citric acids' effects on sandstone.
Purpose of the Study:
- To investigate the impact of different acid types on sandstone properties.
- To determine the optimal acid combination for effective sandstone acid fracturing.
- To provide guidelines for acid fracturing design in oilfields.
Main Methods:
- Acidification experiments using hydrochloric, acetic, and citric acids on sandstone samples.
- Analysis of mechanical properties (uniaxial compressive strength, elastic modulus) and sample quality.
- Microscopic (SEM) and elemental (ICP) analysis to study rock erosion and precipitate formation.
- X-ray diffraction to analyze ion composition and concentration.
Main Results:
- Dibasic acids (hydrochloric + acetic acid) showed the most significant reduction in sandstone quality, compressive strength, and elastic modulus.
- Citric acid and magnesium promoted the formation of high-crystallinity calcite precipitates.
- Scanning electron microscopy confirmed the superior rock erosion effect of the hydrochloric acid + acetic acid mixture.
- Inductively coupled plasma emission spectrometry detected acid rock in solution, and X-ray diffraction identified precipitate composition.
Conclusions:
- The combination of hydrochloric and acetic acids is highly effective for sandstone acid fracturing.
- Different acids induce distinct mineralogical and microstructural changes in sandstone.
- Findings offer practical insights for optimizing acid fracturing operations in oil production.
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