Volume 39 Issue 5
Jan.  2023
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LI Chunyue, LI Qin, LI Deming, et al.Method of predicting flow conductivity of long-term acid-etched fractures in carbonate reservoirs in shunbei oilfield [J]. Drilling Fluid & Completion Fluid，2022, 39（5）：646-653 doi: 10.12358/j.issn.1001-5620.2022.05.017
Citation: LI Chunyue, LI Qin, LI Deming, et al.Method of predicting flow conductivity of long-term acid-etched fractures in carbonate reservoirs in shunbei oilfield [J]. Drilling Fluid & Completion Fluid，2022, 39（5）：646-653 doi: 10.12358/j.issn.1001-5620.2022.05.017
shu

Method of Predicting Flow Conductivity of Long-Term Acid-Etched Fractures in Carbonate Reservoirs in Shunbei Oilfield

doi: 10.12358/j.issn.1001-5620.2022.05.017
  • 1.

    Engineering Technology Research Institute, Sinopec Northwest Oilfield Company, Urumqi , Xinjiang 830011

  • 2.

    Energy College, Chengdu University of Technology, Chengdu, Sichuan 610059

  • 3.

    Drilling Engineering Research Institute of Southwest Petroleum Engineering Co., Ltd., SINOPEC, Deyang, Sichuan 618000

  • Received Date: 2022-04-15
  • Accepted Date: 2022-06-06
  • Rev Recd Date: 2022-05-11
  • Publish Date: 2023-01-10
    Abstract
  • Acid fracturing has been performed with difficulties in the high temperature high pressure carbonate rock hydrocarbon reservoirs in the Shunbei block. The main problem is the dramatic reduction of the effect of acid fracturing resulted from the losses of the flow conductivity of the acid-etched fractures under the long-term action of the closure stresses. In laboratory experiment, the flow conductivity of acid-etched fractures is evaluated to study the changing patterns of the flow conductivity of the acid-etched fractures under different mass fractions of acid, temperatures and closure time. Based on the equations of the flow conductivity of acid-etched fractures under various conditions, a method for predicting the conductivity of long-term acid-etched fractures in Shunbei carbonate reservoir is established and verified. Use this method, the changing pattern of the flow conductivity of the acid-etched fractures at different lengths of time and flow rates is simulated. The simulation results show that at low closure stresses, the reaction rate of the acid is the dominant factor affecting the flow conductivity of the acid-etched fractures. At high closure stresses, however, the dominant factors affecting the flow conductivity of the acid-etched fractures include closure stress, rock characteristics and the nonuniformity of the rock surfaces. The closure stress, on the other hand, is the dominant factor controlling the deformation of the surfaces of the rocks and is also the decisive factor affecting the flow conductivity of the long-term acid-etched fractures. Under long-term action of closure stress, the flow conductivity of a fracture at the deep part of the fracture is decreased in an amplitude larger than the decrease in the flow conductivity of the fracture at its mouth. The distribution of the flow conductivity of artificial fractures produced under mid-term and long-term acid-etching is controlled by the rate of reaction between the acid and the rock.

     

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