Variation Law of Shale Mechanical Parameters under Action of Acid Solution
The outcropping shale in the shale gas block of Chongqing was selected as the research object,and the physical and mechanical properties of shale under acid fracturing were tested to reveal the change law of mechanical properties of shale under acid erosion.The results showed that calcite,dolomite and pyrite in shale reacted with hydrochloric acid to form hydrogen sulfide,carbon dioxide gas and ferric ions,etc.,which made hydrochloric acid change from colorless to yellow,thus causing the dissolution of shale.At the same time,with the increase of acid dosage and the extension of action time,the compressive strength of shale decreased.Under the same conditions,the compressive strength gradually increased with the increase of the bedding angle.With the increase of acid mass fraction and the extension of action time,the tensile strength of shale showed a decreasing trend.Under the same conditions,the tensile strength decreased with the increase of the bedding angle.
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