Advanced Search
DSpace@MIT

Asymmetric source acoustic LWD for the improved formation shear velocity estimation

Research and Teaching Output of the MIT Community

Planned maintenance alert - Monday, April 21: DSpace@MIT will undergo maintenance activities that will affect service availability and access to file content. While the service interruptions should be brief, access to file content may take longer to restore. Status updates will be posted to http://3down.mit.edu/.

Show simple item record

dc.contributor.author Chen, Tianrun
dc.contributor.author Wang, Bing
dc.contributor.author Zhu, Zhenya
dc.contributor.author Toksoz, Daniel R.
dc.contributor.other Massachusetts Institute of Technology. Earth Resources Laboratory en_US
dc.date.accessioned 2012-01-17T16:23:03Z
dc.date.available 2012-01-17T16:23:03Z
dc.date.issued 2010
dc.identifier.uri http://hdl.handle.net/1721.1/68591
dc.description.abstract Most acoustic logging while drilling (LWD) tools generate a single pure borehole mode (e.g., dipole or quadrupole) to estimate the formation shear velocity. We propose an approach where multipole modes are generated simultaneously and used to obtain a better shear estimation. This approach uses an asymmetric source with arrays of receivers distributed azimuthally around the tool to generate and identify signals from different modes. We investigate such an approach using both synthetic and laboratory data. The laboratory data are collected from a scale-model LWD tool with one active source transducer mounted on the side of the tool. Four sets of receiver arrays, each separated by 90 degrees azimuthally, are used to isolate monopole, dipole and quadrupole modes by coherently adding and subtracting received arrivals. A method is then apply to perform dispersion analysis on these arrivals. With least square fitting, formation shear velocities are estimated from both dipole and quadrupole modes' arrivals. We find that, by averaging the estimates obtained independently from dipole and quadrupole modes, we can reduce the uncertainty and improve the confidence of the estimation for the formation shear velocity. en_US
dc.publisher Massachusetts Institute of Technology. Earth Resources Laboratory en_US
dc.relation.ispartofseries Earth Resources Laboratory Industry Consortia Annual Report;2010-15
dc.title Asymmetric source acoustic LWD for the improved formation shear velocity estimation en_US
dc.type Technical Report en_US
dc.contributor.mitauthor Chen, Tianrun
dc.contributor.mitauthor Wang, Bing
dc.contributor.mitauthor Zhu, Zhenya
dc.contributor.mitauthor Burns, Daniel R.
dspace.orderedauthors Chen, Tianrun; Wang, Bing; Zhu, Zhenya; Burns, Daniel R. en_US


Files in this item

Name Size Format Description
paper15_chen_LWD_ ... 669.1Kb PDF

This item appears in the following Collection(s)

Show simple item record

MIT-Mirage