Abstract
Based on the statistics data extracted from underground hazards in “A” region of Yuan Shi oilfield, and with casing failures as an example, engineering hazards, such as sand production, casing hazards, etc., in different geological structures are compared and distinguished. A detailed examination of their relationship is conducted in terms of mineral composition, sedimentary facies and other reservoir aspects. The triggering mechanism of engineering hazards is also theorized. Especially under water injection, the effect of geological structures on engineering hazards is illustrated. Finally, engineering hazards prevention and minimization measures are presented. The results show that in fluvial sediments, casing damage is mainly on the outside of the casing and casing bending. In a shallow lake environment, casing damage is chiefly of the leakage and rupture type.
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