Numerical Investigation into the Influence of Plug Zone on Fracture Deformation in Lost Circulation Controlling
Received date: 2014-11-26
Revised date: 2015-05-04
Online published: 2015-10-10
Fractures intersected with borehole are extremely sensitive to borehole pressure fluctuations,which causes the fissures evolved loss channels.This causes the solid particles in drilling fluid failing to plug the deformable fracture stably,and results in lost circulation frequently.The plug zone formed by lost circulation materials (LCMs) is also simulated and investigated,which changes the deformable behavior of fractures,hoop stress on wellbore and stress intensity factor in fracture tip.The simulation results reveal that the plug zone has the function of preventing wellbore pressure propagation from fluid pressure in fracture to increase,reducing the deformable degree of fracture,weakening the hoop stress on wellbore,and decreasing the stress intensity factor in fracture tip.The deformable behavior of fracture in fractured-vuggy carbonate formations is investigated clearly,and the deformable degree of fracture is predicted,which can provide theoretical basis for mud loss controlling and improve the knowledge of the fracture deformation.
LI Song，KANG Yi-li，LI Da-qi，SHE Ji-ping，WANG Ye-zhong . Numerical Investigation into the Influence of Plug Zone on Fracture Deformation in Lost Circulation Controlling[J]. Natural Gas Geoscience, 2015 , 26(10) : 1963 -1971 . DOI: 10.11764/j.issn.1672-1926.2015.10.1963
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