Use high-definition LWD imaging to identify troublesome fracture zones
Schlumberger provided MicroScope HD high-definition
imaging-while-drilling service to acquire resistivity images to characterize
the fracture network. Based on these resistivity images, mitigation measures
were taken to address fluid loss as well as early water breakthrough.
After drilling, recorded data were processed to be used for geological
interpretation. The interpretation included full structural feature
identification and detailed fracture characterization to identify types of
fractures (conductive or resistive) as well as morphology and geometry of each
fracture (continuous or discontinuous), the fracture density, and fracture
distribution along the logged interval. Minor subseismic faults were also
identified from the images.
Geological interpretation of the high-definition resistivity images
revealed the presence of a few major conductive fractures that were likely
enhanced during drilling, and a large number of partial discontinuous
conductive and resistive fractures.