Southwest Petroleum University

Deqiang Yi

Yuanhua Lin

Kuanhai Deng

Niantao Zhou

Mingyuan Yao

Pengfei Xie

Yang Peng

A quantitative evaluation method for integrity and damage evolution of a cement sheath in an oil-gas well is provided based on a fractal theory, an image processing technology, structural features and failure mechanisms of a casing-cement sheath-formation combination. The method uses correlations among fractal dimensions of casing-cement sheath interface morphology, cement sheath microscopic pore morphology, particle morphology of an initial blank group, and macroscopic mechanical properties including a radial cementing strength of the cement sheath interface, a tensile strength, and a compressive strength to quantitatively evaluate the integrity of the cement sheath of the blank group. The method further uses correlations among fractal dimensions of the casing-cement sheath interface morphology, cement sheath microscopic pore morphology, particle morphology, crack morphology after an alternating load, and the macroscopic mechanical properties of the cement sheath to quantitatively evaluate a regularity of the damage evolution of the cement sheath of a conditional control group.

Growing community of inventors

Chengdu, China

Deqiang Yi