Abstract: Extracting a core sample from within a wellbore is optimized based on information extracted from acoustic signals that are generated downhole. The acoustic signals provide an indication of the formation being cored, which is used to obtain or adjust designated coring operating parameters for accomplishing an efficient and effective coring procedure. Coring operating parameters that are adjusted include weight on bit and bit rotational speed. Optimizing coring operating parameters reduces wear on the bit and produces samples with less fractures. Generating acoustic signals is done by the operation of coring itself, or contacting the formation with a coring bit. Contacting includes impacting the coring bit radially against the wellbore's sidewall, or moving the bit laterally after coring operations have initiated.

Abstract: Extracting a core sample from within a wellbore is optimized based on information extracted from acoustic signals that are generated downhole. The acoustic signals provide an indication of the formation being cored, which is used to obtain or adjust designated coring operating parameters for accomplishing an efficient and effective coring procedure. Coring operating parameters that are adjusted include weight on bit and bit rotational speed. Optimizing coring operating parameters reduces wear on the bit and produces samples with less fractures. Generating acoustic signals is done by the operation of coring itself, or contacting the formation with a coring bit. Contacting includes impacting the coring bit radially against the wellbore's sidewall, or moving the bit laterally after coring operations have initiated.

Abstract: An embodiment of a system for performing a downhole operation includes a carrier having an isolation assembly including at least one packer having a deformable element configured to isolate a section of a borehole in the earth formation, and an injection assembly configured to inject a fluid into the isolated section and pressurize the isolated section. The system also includes a measurement assembly including an interrogation unit coupled to at least one optical fiber having a length disposed at the deformable element that includes a plurality of measurement locations, and a processor configured to receive signals reflected by the plurality of measurement locations in real time during the downhole operation, calculate an amount of deformation of the deformable packer element, and estimate at least one property of the formation based on the deformation, the at least one property including a strain of the formation in response to injection of fluid.

Abstract: An embodiment of a system for performing a downhole operation includes a carrier having an isolation assembly including at least one packer having a deformable element configured to isolate a section of a borehole in the earth formation, and an injection assembly configured to inject a fluid into the isolated section and pressurize the isolated section. The system also includes a measurement assembly including an interrogation unit coupled to at least one optical fiber having a length disposed at the deformable element that includes a plurality of measurement locations, and a processor configured to receive signals reflected by the plurality of measurement locations in real time during the downhole operation, calculate an amount of deformation of the deformable packer element, and estimate at least one property of the formation based on the deformation, the at least one property including a strain of the formation in response to injection of fluid.