A Study on the Hydraulic Isolation Property of Cement-casing and Cement-formation Interfaces by Oleophilic Cement Slurry

doi:10.11885/j.issn.1674-5086.2021.10.03.01

Abstract

Abstract: When cementing with oil-based drilling fluid in shale gas wells, oil in casing and wellbore is easy to reduce the interface isolation performance and form channeling circulation channels, which will have a negative impact on subsequent production. Although the pre-fluid can effectively improve the interface wetting reversal, the oil film retention and adhesion will still occur due to the limitation of flushing efficiency. To this end, we add oil-wetting surfactants to cement slurry, and form oil-wetting cement slurry, giving cement oil-wetting ability. Contact angle, shear bonding strength and interfacial hydraulic isolation tests were used to evaluate the oil-wetting ability and interfacial isolation effect of the cement. It is found that the contact angle of non-polar solvent on the surface of oil-wetting cement is much lower than that on the surface of conventional cement, and the non-polar solvent has good oil-wetting performance. After oil-wet cement cementing with casing and shale core containing white oil and oil-base drilling fluid, the resistance to fluid cross-flow pressure of the cement-casing interface and cement-formation interface were increases by 5 times and 4 times, and the shear bonding strength increases by 205% and 122%, respectively. The addition of oil-wetting surfactant has no negative effect on the hydration degree of cement, mechanical properties of cement and basic engineering performance of cement stone. The results show that the addition of the oil-wetting surfactant can effectively improve the cement ring and oil-bearing interface, and has the potential to improve the cement sheath, casing and formation interface bonding and isolation performance under oil-based drilling fluid condition.

Key words: shale gas, well cementing, interface isolation, oil base drilling fluid, surfactant

CLC Number:

TE256

HUANG Sheng, ZHOU Can, LI Zaoyuan, YANG Chuan, LIU Yang. A Study on the Hydraulic Isolation Property of Cement-casing and Cement-formation Interfaces by Oleophilic Cement Slurry[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2024, 46(1): 115-125.

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