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A new method for wellbore stability evaluation based on fractured carbonate reservoir rock breaking degree

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Abstract

Borehole wall collapse is rare in the drilling of carbonate rock formations. However, several wells in the Maantang–Leikoupo carbonate formation have collapsed and released blocks to varying degrees, which have caused sticking and hindered efficient development of oil and gas resources. Thus, through the study of macroscopic and microscopic characteristics of carbonate rocks in this area, it is concluded that the fractures in this area are developed. In order to facilitate the analysis of formation fracture development, the concept of formation integrity coefficient which is commonly used in rock engineering was introduced. Firstly, the feasibility of using the formation integrity coefficient to characterize the degree of rock fragmentation was verified by the laboratory acoustic experiment. Finally, the empirical formulas were proposed regarding the formation integrity coefficient and the cohesion of carbonate rocks in this area by combining the laboratory mechanical experiment and acoustic experiment, and a calculation model for the collapse density considering formation integrity was established. Results provide guidance for research on carbonate wellbore stability, especially for fractured carbonate strata.

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Authors and Affiliations

  1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, 610500, Sichuan, People’s Republic of China

    Houbin Liu, Shuai Cui, Yingfeng Meng, Xu Han, Teng Liu & Anran Yu

  2. Shale Gas Research Institute, PetroChina Southwest Oil and Gas Field Company, Chengdu, 610000, Sichuan, People’s Republic of China

    Yu Fan

  3. Research Institute of Petroleum Exploration and Development, Beijing, 100089, People’s Republic of China

    Ye Tao

Authors
  1. Houbin Liu
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  2. Shuai Cui
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  3. Yingfeng Meng
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  4. Xu Han
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  5. Teng Liu
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  6. Yu Fan
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  7. Ye Tao
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  8. Anran Yu
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Corresponding authors

Correspondence to Houbin Liu or Yingfeng Meng.

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The authors declare no competing interests.

Additional information

Responsible Editor: Santanu Banerjee

Highlights

• The concept of formation integrity coefficient is introduced to reflect the degree of carbonate formation fragmentation.

• Through a series of laboratory experiments, the formation strength was studied, and the empirical formulas of formation integrity coefficient and carbonate cohesion were fitted with the experimental data.

• Combined with the empirical formula of formation integrity coefficient and carbonate cohesion obtained above, the calculation formula of collapse density considering the degree of formation fragmentation is obtained.

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Liu, H., Cui, S., Meng, Y. et al. A new method for wellbore stability evaluation based on fractured carbonate reservoir rock breaking degree. Arab J Geosci 14, 647 (2021). https://doi.org/10.1007/s12517-021-06941-7

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  • DOI: https://doi.org/10.1007/s12517-021-06941-7

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