Abstract
Multi-stage volume fracturing in horizontal wells is the main means for efficient reforming of unconventional reservoirs. The fracture spacing is the core parameter of multi-stage fracturing in horizontal wells. In view of the previous design studies, the spacing is optimized by constant flow, resulting in large errors in stress interference. Based on the basic equations of fluid-solid coupling and the principle of damage mechanics, the finite element model of multi-stage fracturing in horizontal wells is established by extended finite element method. The dynamic distribution of each fracture injection flow is realized by ABAQUS finite element platform and FORTRAN programming of subroutine UAMP. The principle of fracture spacing optimization is given, and the law of spacing optimization under different formation conditions and construction parameters is studied. The results show that under the small fracture spacing, the intermediate fractures are short and wide due to stress interference and inhibit expansion. The fractures on both sides are long and narrow. In the middle fracture extrusion, the fractures on both sides are prone to sand plugging, which affects the fracturing effect. Injection volume and elastic modulus are the main controlling factors affecting the fracture spacing. In high elastic modulus reservoirs, it is recommended to adopt little injection volume and large spacing; conventional formations can adopt little injection volume and small spacing design patterns, which allow multiple fractures to expand evenly and effectively while ensuring construction safety. Through the secondary development of subroutine FORTRAN language programming, the flow dynamic distribution of multi-stage fracturing process in horizontal wells is realized. The main control factors of fracture spacing optimization are studied, this is useful for rationally designing multi-stage fracture spacing and improving the effect of unconventional reservoir reconstruction.
Copyright 2019, IFEDC Organizing Committee.
This paper was prepared for presentation at the 2019 International Field Exploration and Development Conference in **’an, China, 16–18 October, 2019.
This paper was selected for presentation by the IFEDC Committee following review of information contained in an abstract submitted by the author(s). Contents of the paper, as presented, have not been reviewed by the IFEDC Technical Team and are subject to correction by the author(s). The material does not necessarily reflect any position of the IFEDC Technical Committee its members. Papers presented at the Conference are subject to publication review by Professional Team of IFEDC Technical Committee. Electronic reproduction, distribution, or storage of any part of this paper for commercial purposes without the written consent of IFEDC Organizing Committee is prohibited. Permission to reproduce in print is restricted to an abstract of not more than 300 words; illustrations may not be copied. The abstract must contain conspicuous acknowledgment of IFEDC. Contact email: paper@ifedc.org.
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Heilongjiang Province Science and Technology Plan Provincial Academy of Science and Technology Cooperation Project (YS19A04), Funded by the Postdoctoral Science Foundation of China (2019M661249).
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Li, Jb., Wang, Sl., Dong, Kx., Zhao, Xy. (2020). Dynamic Distribution of Multi-stage Fracturing Flow in Horizontal Well and Optimization of Fracture Spacing. In: Lin, J. (eds) Proceedings of the International Field Exploration and Development Conference 2019. IFEDC 2019. Springer Series in Geomechanics and Geoengineering. Springer, Singapore. https://doi.org/10.1007/978-981-15-2485-1_232
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DOI: https://doi.org/10.1007/978-981-15-2485-1_232
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