Abstract
Given the requirements of large-scale multi-stage fracturing (stimulated reservoir volume-oriented) in horizontal wells, the research and development of the viscosity-variable slickwater fracturing fluid system are carried out to solve the application problems of low solid content (20%–30%), high required concentrations, slow dissolution, poor thickening performance, and proneness to stratification of the previously extensively-used slickwater. The molecular structure design is performed to enable instant dissolving, viscosity increasing, and drag reducing. The core material of multi-component polymers is synthesized by introducing the rigid functional monomer and high-polarity hydrophilic monomer into the molecular chain structure, based on which the suspension-type drag reducer is developed. The resultant low concentration viscosity-variable slickwater fracturing fluid system delivers excellent performance featuring instant dissolution, low use concentrations, low friction, and viscosity-variability. The experiment results show that the aggregates of the low concentration viscosity-variable slickwater are dispersed when the drag reducer concentration is low—the viscosity is 2.74 mPa·s at the concentration of 0.05%. Moreover, the aggregates are combined into a spatial network structure, when the drag reducer concentration is high—the viscosity is 18.56 mPa·s at the concentration of 0.3%. With this feature, the presented slickwater can be converted between slickwater and proppant-carrying fluids. Meanwhile, the drag reduction rate of the low viscosity slickwater is high, 79.46% for the low-viscosity slickwater and 70.01% for the high viscosity slickwater. The drag reduction performance is good. The field test results state that the system presents the advantages of the low required concentration, high drag reduction rate, excellent proppant carrying performance, and rapid dissolution. It enables injection without in-advance mixing and thus eliminates the need for the continuous mixing device. Manpower and materials are saved and operation costs are reduced.
Copyright 2022, IFEDC Organizing Committee.
This paper was prepared for presentation at the 2022 International Field Exploration and Development Conference in **’an, China, 16–18 November 2022.
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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Li, Y. et al. (2023). Research and Application of the Low Concentration Viscosity-Variable Slickwater Fracturing Fluid System. In: Lin, J. (eds) Proceedings of the International Field Exploration and Development Conference 2022. IFEDC 2022. Springer Series in Geomechanics and Geoengineering. Springer, Singapore. https://doi.org/10.1007/978-981-99-1964-2_404
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DOI: https://doi.org/10.1007/978-981-99-1964-2_404
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