Evaluation of the effectiveness of network fracturing in ultra-deep and  extremely-thick reservoir in the Kuqa piedmont

doi:10.3969/j.issn.1672-7703.2020.06.011

Abstract

Abstract: The Cretaceous Bashijiqike Formation is the main producing layer of the Keshen gas field in the Kuqa piedmont. The deepest exploration well in the field is more than 8000 m. The reservoir pressure is 150 MPa, maximum temperature is 190 C, and the thickness is 100300 m. These extreme operating conditions and the attendant well-control risks limit the testing methods that can be used for evaluation of fracturing effects following stimulation. It is therefore necessary to develop a method for obtaining a clear understanding of whether this kind of reservoir is suitable for stimulation by volume fracturing and establish how to determine whether a reservoir has been effectively fractured. This study summarizes the network fracturing technologies commonly used for the ultra-deep reservoirs in the Kuqa piedmont. The geological and engineering factors that lead to the formation of complex fracture networks are analyzed. In doing so, interconnection and extension of artificial and natural fractures and the geological and mechanical conditions affecting the formation of longitudinal and transverse fracture networks are discussed. The theoretical change in operating curves that should result from successful temporary plugging diversion is studied. Actual operating curves and theoretical curves are then compared and analyzed after a temporary plugging diversion agent has been inserted in the artificial fractures. The conclusions are mutually verified by a combination of micro-seismic monitoring and interpretation of wells after network fracturing. The results show that, for ultra-deep and extremely-thick reservoirs with well-developed natural fractures, transverse fracture networks and longitudinal multi-layer stimulation can theoretically be achieved by fracturing. However, the temporary plugging diversion technologies currently used within fractures, and temporary plugging layering at the fracture opening, are ineffective. It is therefore important to engage in research on ultra-deep temporary plugging layering and temporary plugging diversion technologies that will provide strong technical support for efficient exploration of reservoirs deeper than 8000 m and increase the likelihood of exploration breakthroughs.

CLC Number:

Yang Zhanwei, Cai Bo, Xu Yun, Liu Ju, Liu Huifeng, Wang Liwei, Gao Ying, Han Xiuling, Wang Liao, Ma Zeyuan. Evaluation of the effectiveness of network fracturing in ultra-deep and extremely-thick reservoir in the Kuqa piedmont[J]. China Petroleum Exploration, 2020, 25(6): 105-111.

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Evaluation of the effectiveness of network fracturing in ultra-deep and extremely-thick reservoir in the Kuqa piedmont

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