Abstract
Dengying Formation carbonate reservoir in Gaomo area of Sichuan Basin has strong heterogeneity, and reservoirs I, II and III with permeability ranging from 0.05 to 3.02 mD. The use of diverting acid has played an important role in reservoir stimulation, but the rule of continuous plugging about diverting acid is unclear.
In this paper, different fractures are simulated by slotted outcrop cores. Under the same confining pressure, different constant injection pressure modes are adopted to seal reservoirs I, II and III with diverting acid. The different types of viscoelastic diverting acid lasting sealing time and core etching shape are analyzed.
The results show that the viscoelastic diverting acid with low acid concentration has different plugging regularity compared with viscoelastic diverting acid with high acid concentration. The viscoelastic diverting acid with low acid concentration has better plugging ability for type I reservoirs, and can be continuously plugged for more than 30 min within 4 MPa, while the viscoelastic diverting acid with high acid concentration has better plugging ability for type II and III reservoirs. For reservoirs II, plugging time is as long as 30 min under 10 MPa; for reservoirs III, more than 30 min within 13 MPa was obtained. Two field tests have been carried out, and the results show that the two types of diverting acid have the same continuous plugging performance as the laboratory study.
Through the study of plugging performance, the rules of different plugging of low acid concentration viscoelastic diverting acid and high acid concentration viscoelastic diverting acid for reservoirs I, II and III are clarified, which provides a strong basis for efficient diverting acidification of strong heterogeneous reservoirs.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
References
Sun, C., Liu, Y., Xiang, C., et al.: Discussion on evaluation method of acidification effect of Dengying Formation in Gaomo area. Pet. Nat. Gas Chem. Ind. 46(5), 59–64 (2017)
Wang, D., Zhang, Y., Deng, S., et al.: Laboratory evaluation and field application of diverting acid. Pet. Nat. Gas Chem. Ind. 42(3), 265–269 (2013)
Liu, Y., Wang, X., Wang, C., et al.: Development and application of CT high temperature diverting acid. Pet. Nat. Gas Chem. Ind. 40(6), 614–615 (2011)
Wang, X., Liu, Y., Liao, J., et al.: Study on influencing factors of diverting performance of diverting acid. Pet. Nat. Gas Chem. Ind. 41(2), 204–206 (2012)
Toseef, A., Beaman, D.J.: Vescoelastic Surfactant Diversion: An Effective Way to Acidize Low-Temperature Wells. SPE136574 (2010)
Taylor, D., Santhana Kumar, P., Fu, D., et al.: Vescoelastic Surfactant based Self-diverting Acid for Enhanced Stimulation in Carbonate Reservoirs. SPE82263 (2003)
Kayumov, R., Konchenko, A., Bairamov, A., et al.: Experience of Carbonate Acidizing in the Challenging Environment of the Volga-Urals Region of Russia. SPE168167 (2014)
Acknowledgments
This project is supported by Major National Science and Technology Project (No. 2016ZX05052).
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2020 Springer Nature Singapore Pte Ltd.
About this paper
Cite this paper
Sun, C., Tang, Yf., Xiang, C., Wang, C. (2020). Study on Continuous Sealing Law of Different Viscoelastic Diverting Acids in Dengying Formation of Sichuan Basin. 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_237
Download citation
DOI: https://doi.org/10.1007/978-981-15-2485-1_237
Published:
Publisher Name: Springer, Singapore
Print ISBN: 978-981-15-2484-4
Online ISBN: 978-981-15-2485-1
eBook Packages: EngineeringEngineering (R0)