“Casing in Casing” Mechanical Isolation Refracturing Technology in Fuling Shale Gas Wells

LIU Yaowen; MING Yue; ZHANG Xudong; BIAN Xiaobing; ZHANG Chi; WANG Haitao

doi:10.11911/syztjs.2022010

Volume 50 Issue 3

Jun. 2022

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Petroleum Drilling Techniques > 2022 > 50(3): 86-91. > DOI: 10.11911/syztjs.2022010

LIU Yaowen, MING Yue, ZHANG Xudong, BIAN Xiaobing, ZHANG Chi, WANG Haitao. “Casing in Casing” Mechanical Isolation Refracturing Technology in Fuling Shale Gas Wells[J]. Petroleum Drilling Techniques, 2022, 50(3): 86-91. DOI: 10.11911/syztjs.2022010

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“Casing in Casing” Mechanical Isolation Refracturing Technology in Fuling Shale Gas Wells

1.
Sinopec Chongqing Fuling Shale Gas Exploration and Development Company, Chongqing, 408100, China
2.
Sinopec Research Institute of Petroleum Engineering, Beijing, 102206, China

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Received Date: January 25, 2021
Revised Date: March 15, 2022
Available Online: April 18, 2022

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Abstract

The application of temporary plugging and diverting refracturing in Fuling Shale Gas Field brought on technical difficulties accompanied by poor production increase. To solve this problem, this paper analyzed principles and characteristics of technologies used in shale gas wells abroad. They included temporary plugging and diverting refracturing, and mechanical isolation refracturing. What was found was that that mechanical isolation could completely block the perforations and precisely control fracture initiation of hydraulic refracturing. From that, the “casing in casing” mechanical isolation refracturing technology took shape. In Fuling Shale Gas Field, this technology was tested with a casing (outer diameter of 88.9 mm) inserted into the other one (inner diameter of 115.0 mm) where in a new and closed well casing was formed. In addition, refracturing technologies targeted for different residual oil distribution in the reservoir were developed through studies. In the original well casing, attention should be paid to exploring the residual oil among fractures in the stimulated well section. At the same time,emphasis should target the poorly stimulated sections, to see how to recover the flow conductivity of the fractures. After implementing that technology in Well JYAHF, the recoverable reserve for a single well increased by 0.36×10⁸ m³, and the recovery efficiency increased by 4.8%. The study shows that the “casing in casing” mechanical isolation refracturing technology can significantly improve the result of stimulation and provide technical support for long-term and efficient shale gas field development in China.
- shale gas well,
- refracturing,
- casing in casing,
- mechanical isolation,
- small casing fracturing,
- Fuling Shale Gas Field

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