Volume 34 Issue 4
Jul.  2017
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LIU Xiang, Yi Xiangyi, WU Yuanqin, LI Qin. Numerical Simulation and Analysis of Micro Flow of Acids in Fractures Generated in Acid Fracturing[J]. DRILLING FLUID & COMPLETION FLUID, 2017, 34(4): 106-111. doi: 10.3969/j.issn.1001-5620.2017.04.020
Citation: LIU Xiang, Yi Xiangyi, WU Yuanqin, LI Qin. Numerical Simulation and Analysis of Micro Flow of Acids in Fractures Generated in Acid Fracturing[J]. DRILLING FLUID & COMPLETION FLUID, 2017, 34(4): 106-111. doi: 10.3969/j.issn.1001-5620.2017.04.020

Numerical Simulation and Analysis of Micro Flow of Acids in Fractures Generated in Acid Fracturing

doi: 10.3969/j.issn.1001-5620.2017.04.020
  • Received Date: 2017-04-05
  • Publish Date: 2017-07-31
  • Acid fracturing is an important stimulation measure used in enhancing oil recovery. The understanding of flow of acids in fractures generated in reservoir fracturing is of great importance. Physical experiments have been conducted previously in the study of acid flow in fractures, and the fracture model used in the experiments are quite different than the actual fractures generated in acid fracturing, the effects of the roughness of the surfaces of fractures on acid flow are seldom considered. This paper introduces the use of a software Fluent to numerically simulate acid flow in fractures, and analyzes the effects of the roughness of the surfaces of fractures on acid flow. Experimental results showed that the flow rate curves of both single-phase flow and two-phase flow along the horizontal central axis demonstrated a shape of "厂", while along the vertical central axis, the curve showed a shape of "几". In single-phase flow, flow rates around wave crest were much greater than the flow rates in other area, and the flow rate along the central axes were low. On the other hand, in two-phase flow, highest flow rates were found along central axes. With an increase in roughness of the surfaces of fractures, the length of flow of acid is extended. At the same roughness, the flow length of acid and acid viscosity are not in linear relationship. When M=6, the flow lengths of acid in fractures with 4 different surface roughness all are the shortest. When M < 6, the flow lengths decrease with increase in viscosity ratio. When M > 6, the flow lengths increase with increase in viscosity ratio. A plateau appears with M between 8 and 11, meaning that the effects of viscosity ratio on acid flow length are becoming weak. Increase in acid flow length increases the length of acid erosion, forms more cannelures, thereby enhancing the flow conductivity of fractures and fulfilling the purpose of acid fracturing. Taking into account operation cost, in selecting prepad fluid and acid, viscosities corresponding to the values around the descending section and the plateau section of the flow rate curve, should not be used.

     

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