Nguyen Thi Kim Dung, Nguyen Van Ngo, Do Thanh Trung, Hoang Anh Dung, Ngo Thi Nguyen and Ta Van Thinh 2025. Study on the formulation of additives to improve elasticity, tensile strength, and crack propagation resistance of the cement sheath in oil and gas well cementing . Petrovietnam Journal. 1, (Feb. 2025), 38-48. DOI:https://doi.org/10.47800/PVSI.2025.01-05.