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
Abstract
This study focuses on developing a composite additive system to improve the elasticity, tensile strength, and crack propagation resistance of the cement sheath in oil and gas well cementing. The primary materials used are nitrile rubber particles and alkali-resistant glass fibers, selected based on their appropriate particle size distribution and fiber dimensions that minimally affect the rheological properties of cement slurry.
As a result, the study successfully established a composite additive system comprising 0.75% alkali-resistant glass fibers and 6 - 6.5% nitrile rubber particles that effectively enhances the elasticity, tensile strength, and crack propagation resistance of the cement sheath in oil and gas cementing. After surface modification with dispersing agent, the composite additives demonstrated the ability to increase the tensile strength-to-elastic modulus ratio, enabling the cement sheath to better withstand long-term stress in downhole oil and gas well environments. Additionally, the impact strength of the cement sheath containing the composite additives was significantly higher compared to samples without additives.
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