ABSTRACT

Wang, S.; Dong, K.; Song, W.; Li, J., and Xing, C., 2018. Influence of stress shadow on multi-fractures initiation mechanism under volume fracturing in offshore oil drilling. In: Liu, Z.L. and Mi, C. (eds.), Advances in Sustainable Port and Ocean Engineering. Journal of Coastal Research, Special Issue No. 83, pp. 172–178. Coconut Creek (Florida), ISSN 0749–0208.

In order to reveal the multi-fractures initiation mechanism, according seepage theory, the full three-dimensional multi-fractures initiation local stress model was built by considering the existed of first fracture, the mechanism of stress shadow and initiation pressure change law of follow up fractures were given by simulation methods and combined the maximum tensile stress theory, the reliability was verified by application example. The analysis shows that: The stress shadow caused the existed of compaction zone near the fracture, the stress type was changed in the compaction zone, the minimum principal stress was increased, these lead that the fracture form changed or the fracture direction changed, and the initiation pressure increased; With the increased of elastic modulus and the fracture size, the compaction zone outward passage and affected area increased; After the number of existed fractures was more than 2, the increase of initiation pressure not obvious.

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