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A modified Ester-branched thickener for rheology and wettability during CO2 fracturing for improved fracturing property

  • Qiang LiEmail author
  • Yanling Wang
  • Augustus Boadi Owusu
Research Article
  • 26 Downloads

Abstract

The thickening performance of CO2 fracturing fluid was poor because of the low apparent viscosity. In this paper, the thickening performance of a modified silicone on liquid CO2 is measured, and a rheology was investigated according to the consistency coefficient K and rheological index n. Meanwhile, a reservoir model was established to evaluate the fracturing property. Results showed that the modified silicone contributes to improve the apparent viscosity of liquid CO2 and decrease the rheology of liquid CO2. With the thickener content or pressure increase, the apparent viscosity of liquid CO2 increases, and the rheological index n decreased obviously. A reduced apparent viscosity is shown as the flow rate or temperature rises, but the rheology increased gradually. The fracturing simulation herein shows that thickened CO2 fracturing fluid could improve obviously the fracture property. This modified thickener possesses the potential as a thickener and could be a reliable alternative to the thickener in CO2 fracturing technology, and the large contact angle improved the backflow property of this CO2 thickener from rock surfaces. The development of CO2 fracturing technology provides basic data for the improvement of greenhouse effect and clean mining of energy.

Keywords

CO2 fracturing technology CO2 thickener Capillary viscometer Fracturing simulation evaluation Silicone polymer 

Notes

Funding information

This work was supported by the National Natural Science Foundation of China (U1762212) and Shandong Province foam fluid efficient exploitation of oil and gas engineering research center in China University of Petroleum (East China). Moreover, we should be grateful for Binfei Li and Hao Bai due to the technical support of the capillary viscometer.

Supplementary material

11356_2019_5386_MOESM1_ESM.docx (214 kb)
ESM 1 (DOCX 214 kb)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.School of Petroleum EngineeringChina University of Petroleum (East China)QingdaoChina

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