Publication Date:
2020-07-20
Description:
Drilling induced fractures are frequently encountered in wells that are drilled overbalanced. These fractures are
typically close to vertical and have the same direction as natural or hydraulically induced fractures that extend parallel to the maximum formation stress direction. The appearance of fractures filled with a mixture of oilbased
mud and formation fluid changes resistivity
distribution around the borehole. This resistivity change affects the multiple components and multiple depths of
investigation measurements of the modern induction tools differently depending on fracture orientation, fracture length, and formation resistivities. The fractures also create anisotropy in acoustic properties
around the borehole, enabling them to be effectively detected/measured using a cross-dipole acoustic tool. Analysis of the measured induction data using advanced inversion and modeling techniques allows recovery of the fracture orientation and length as well
as horizontal and vertical resistivities of the undisturbed formation. Analysis of the measured cross-dipole data allows the determination of the fracture intensity and orientation, which can be jointly used with the multicomponent
induction (3DEX) results to reduce
interpretation uncertainties and better characterize the fracture parameters.
Type:
Conference or Workshop Item
,
PeerReviewed
Format:
text
