Volume 42 Issue 6
Dec.  2025
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TANG Xiaofan, LUO Pandeng, SONG Zhifeng, et al.Experimental study on optimization of acid-fracturing technique for efficient communication of multi-fracture-cavity structure reservoirs[J]. Drilling Fluid & Completion Fluid，2025, 42（6）：821-828 doi: 10.12358/j.issn.1001-5620.2025.06.015
Citation: TANG Xiaofan, LUO Pandeng, SONG Zhifeng, et al.Experimental study on optimization of acid-fracturing technique for efficient communication of multi-fracture-cavity structure reservoirs[J]. Drilling Fluid & Completion Fluid，2025, 42（6）：821-828 doi: 10.12358/j.issn.1001-5620.2025.06.015
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Experimental Study on Optimization of Acid-Fracturing Technique for Efficient Communication of Multi-Fracture-Cavity Structure Reservoirs

doi: 10.12358/j.issn.1001-5620.2025.06.015
  • 1.

    Research Institute of Petroleum Engineering, SINOPEC Northwest Oilfield Company, Urumqi, Xinjiang 830011

  • 2.

    National key Laboratory of oil and Gas Reservoir Geology and Exploitation, Urumqi, Xinjiang 830011

  • 3.

    State Key Laboratory of Oil and Gas Reservoir Geology and Development Engineering, Southwest Petroleum University, Chengdu, Sichuan 610500

  • Received Date: 2025-05-19
  • Accepted Date: 2025-09-01
  • Rev Recd Date: 2025-08-21
    • Available Online: 2025-12-08
  • Publish Date: 2025-12-08
    Abstract
  • Fractured-vuggy carbonate reservoirs are difficult to stimulate because of the complex fracture and vug connection as well as the varied formation structures. Existing technologies cannot be used to efficiently produce the multiple fracture-and-vug reservoirs. To deal with this problem, a visual experimental device for multi-structure node flow reaction was developed and a solid retarded acid used in acid fracturing experiment. Using the experimental device and through the acid fracturing experiment, the flow path of the fracturing fluid was observed and the effects on the concentration of the acid were analyzed, and as a result, an optimization strategy based on dimensionless breakthrough volume as the criterion was proposed. Experimental results show that the solid retarded acid can reduce the acid consumption in the early and middle stages of the fracturing job, enhance the dissolution and permeability-increasing effects in the far-end, as well as extend the lengths of propped fractures. High concentration acid solutions are suitable for acidifying a series-connected fracture and vug structure, since the pressures inside the structure increase fast, the breakthrough time can be shortened, and the volume of acids required can be reduced. In a parallel-connected fracture and vug structure, the acid solution preferentially enters the unfilled fractures, and the use of a high concentration acid solution results in difficulty of flow in the filled areas. Thus, a low concentration acid solution or a “temporary plugging agent + high concentration acid solution” combination is recommended for use in acidifying parallel-connected structures. This study has revealed the flow mechanism of an acid solution in a complex fractured-vuggy structure, and provided a technical support for high-efficiency stimulation of heterogeneous carbonate reservoirs.

     

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