Evaluating sealability of blended smart polymer and fiber additive for geothermal drilling with the effect of fracture opening size

Magzoub, Musaab; Anyaezu, Tobenna; Salehi, Saeed; Li, Guoqiang; Fan, Jizhou; Teodoriu, Catalin; Saleh, Fatemeh K.; Taleghani, Arash Dahi

doi:10.1016/j.petrol.2021.108998

Evaluating sealability of blended smart polymer and fiber additive for geothermal drilling with the effect of fracture opening size

Journal Article · Sun May 30 00:00:00 EDT 2021 · Journal of Petroleum Science and Engineering

DOI:https://doi.org/10.1016/j.petrol.2021.108998· OSTI ID:1977534

^[1]; Anyaezu, Tobenna ^[2]; Salehi, Saeed ^[2]; Li, Guoqiang ^[3]; Fan, Jizhou ^[3]; ^[2]; Saleh, Fatemeh K. ^[2]; Taleghani, Arash Dahi ^[4]

Univ. of Oklahoma, Norman, OK (United States); OSTI
Univ. of Oklahoma, Norman, OK (United States)
Louisiana State Univ., Baton Rouge, LA (United States)
Pennsylvania State Univ., University Park, PA (United States)

Geothermal formations often contain extensive fracture networks. These fracture networks contribute to the significant loss of drilling fluids during geothermal drilling. Multiple loss circulation materials (LCM) such as fiber, granules, and pills have been proposed to tackle this problem but with only limited success. Recent advances in materials science have led to the development of thermoset shape memory polymers (SMP) to address the lost circulation problem. In this paper, we evaluate a thermoset SMP performance in sealing near wellbore fractures of different sizes in geothermal wells. The SMP performance was assessed using granite disks and cylindrical granite cores having fracture sizes of 1000 μm and 3000 μm. A static filtration test was performed using cedar fiber, CaCO₃, and SMP. Results showed cedar fiber performed better than the CaCO₃., reducing fluid loss by 89% and improving sealing pressure by 200 psi. A novel dynamic testing unit that allows for high-temperature testing under flowing conditions was used in this study. The analysis showed that 3% by weight SMP and fiber blends could bridge and plug the 1000 μm fracture. For a larger fracture of 3000 μm width, there was a need to increase the weight concentration of the SMP to 6% to plug the fracture opening effectively. We showed the influence of key parameters such as the type of LCM, concentration, and particle size distribution in optimizing the performance of drilling fluid loss treatment.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Oklahoma, Norman, OK (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE)

Grant/Contract Number:: EE0008602

OSTI ID:: 1977534

Journal Information:: Journal of Petroleum Science and Engineering, Journal Name: Journal of Petroleum Science and Engineering Journal Issue: C Vol. 206; ISSN 0920-4105

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Evaluating sealability of blended smart polymer and fiber additive for geothermal drilling with the effect of fracture opening size

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