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Large-Scale Network Fracturing Practice in Deep Coal Seam in Eastern Ordos Basin
No.8 coal seam of Benxi Formation in Shenmu-Jiaxian Block in eastern Ordos Basin are characterized by tight, low permeability and developed beddings and cleats, fracturing is required to increase single well production. However, field practice proved that conventional vertical well fracturing has no economic benefits [1–3]. Based on previous research and field constructions, a study aims to build a large, dense and fully supported volumetric fracture network for No.8 coal seams was carried out. Fracability evaluation of deep coal seam was first studied. No.8# coal seam has good coal body structure, developed fractures and cleats, high gas content, lithology of top roof and bottom floor are mudstone, which has good foundations of building large-scale fracture network through fracturing. Then geo-engineering dessert evaluation criteria was established, and key fracturing technologies including staged fracturing, differentiated slug injection and fracture-expansion by varing injection rate and fluid viscosity, highly efficient proppant-filling technology were formed and applied in the filed fracturing construction of JH1 in Ordos Basin. The success of JH1 is a great breakthrough in deep coal seam gas fracturing technology, which provide reference and technical guidance for the exploration and development of similar reservoirs.
Large-Scale Network Fracturing Practice in Deep Coal Seam in Eastern Ordos Basin
No.8 coal seam of Benxi Formation in Shenmu-Jiaxian Block in eastern Ordos Basin are characterized by tight, low permeability and developed beddings and cleats, fracturing is required to increase single well production. However, field practice proved that conventional vertical well fracturing has no economic benefits [1–3]. Based on previous research and field constructions, a study aims to build a large, dense and fully supported volumetric fracture network for No.8 coal seams was carried out. Fracability evaluation of deep coal seam was first studied. No.8# coal seam has good coal body structure, developed fractures and cleats, high gas content, lithology of top roof and bottom floor are mudstone, which has good foundations of building large-scale fracture network through fracturing. Then geo-engineering dessert evaluation criteria was established, and key fracturing technologies including staged fracturing, differentiated slug injection and fracture-expansion by varing injection rate and fluid viscosity, highly efficient proppant-filling technology were formed and applied in the filed fracturing construction of JH1 in Ordos Basin. The success of JH1 is a great breakthrough in deep coal seam gas fracturing technology, which provide reference and technical guidance for the exploration and development of similar reservoirs.
Large-Scale Network Fracturing Practice in Deep Coal Seam in Eastern Ordos Basin
Springer Ser.Geomech.,Geoengineer.
Lin, Jia'en (editor) / Luo, Cheng (author) / Li, Yun-zi (author) / Cui, Jian (author) / Yu, Yang-yang (author) / Yao, Dan-dan (author) / Lu, Jun-kai (author) / Sun, Hong-jing (author) / Zhao, Wan-chun (author) / Li, Yun-feng (author)
International Field Exploration and Development Conference ; 2023 ; Wuhan, China
Proceedings of the International Field Exploration and Development Conference 2023 ; Chapter: 3 ; 30-45
2024-03-05
16 pages
Article/Chapter (Book)
Electronic Resource
English
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