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• W4241152738 abstract "Rock Mechanics and Wellbore Stability Analysis While Drilling using LWD Sonic, Density and Caliper Measurements Paul Boonen; Paul Boonen PathFinder Energy Services Search for other works by this author on: This Site Google Scholar Graham McElhinney Graham McElhinney PathFinder Energy Services Search for other works by this author on: This Site Google Scholar Paper presented at the SPE/ISRM Rock Mechanics Conference, Irving, Texas, October 2002. Paper Number: SPE-78208-MS https://doi.org/10.2118/78208-MS Published: October 20 2002 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Get Permissions Search Site Citation Boonen, Paul, and Graham McElhinney. Rock Mechanics and Wellbore Stability Analysis While Drilling using LWD Sonic, Density and Caliper Measurements. Paper presented at the SPE/ISRM Rock Mechanics Conference, Irving, Texas, October 2002. doi: https://doi.org/10.2118/78208-MS Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentAll ProceedingsSociety of Petroleum Engineers (SPE)SPE/ISRM Rock Mechanics Conference Search Advanced Search AbstractThe art of rock mechanical and well bore stability analysis has moved to the real-time domain with the use of Logging-While-Drilling tools. Rock mechanical analysis based primarily on sonic logs (compressional and shear slowness) is a well established technique to identify wellbore stability issues. Logging-While-Drilling logs are slowly replacing wireline logs in large numbers of wells. Not only has the LWD data quality equalled wireline data quality, these data are now available in real-time while drilling. The rock mechanical analysis previously restricted to post drilling analysis, can now be done while drilling. The typically required sonic data (DTP and DTS), the bulk density and a shale indicator are sent to surface in reasonable time increments and the rock mechanical evaluation programs are installed on the rig site LWD systems. Alternatively, the data can be sent to service company or oil company's offices and analysis performed there.In addition to traditional rock mechanical computations, a new technique is introduced to evaluate borehole break-out and its orientation while drilling using an LWD caliper measurement. The LWD caliper tool used in the North Sea examples employs three ultrasonic transducers to measure the stand-off between the logging tool and the borehole wall. The caliper is computed from these three measurements. In the new method we fit an ellipse through the three measurements and compute the minimum and maximum axes of this ellipse. With the tool face information provided by the LWD survey tool, we can compute the orientation of these axes. Where borehole break-out is resulting from stress relieve at the borehole wall, the direction of the long axis coincides with the direction of the minimum horizontal stress in the formation. Three dimensional borehole caliper images can be created after logging.IntroductionLogging-While-Drilling (LWD) measurements for formation evaluation (gamma ray, resistivity, density, neutron, sonic) are gaining better and better acceptance in the industry. Time and again comparisons between LWD and wireline logs have shown that the LWD data have attained the quality necessary for quantitative analysis such as water saturation and porosity computation and more esoteric applications such as rock mechanical log analysis. LWD data have one big advantage over wireline logs in that the LWD logs are available in real-time while drilling. Admittedly, the mud pulse telemetry systems currently available still lack speed, but enough information is transmitted to the surface to make real-time decisions. This paper explores the LWD tools and measurements available for rock mechanical log analysis and proposes a new way to determine stress field orientation from borehole break-out using an LWD caliper measurement. At the same time new borehole caliper images are produced from the same measurement.Rock Mechanical Log AnalysisLog analysis for rock mechanics is largely based on the availability of sonic logs with compressional and shear slowness measurements that allow computation of a dynamic Poisson's ratio of the formation1. The calculation of the other dynamic elastic moduli (bulk, shear and Young's modulus) also requires a bulk density. As always in log analysis, a shale volume is one of the most important inputs in any algorithm. Still problematic are the difference between the minimum and maximum horizontal stresses and the orientation of the stress field. Borehole break-out analysis is one of the techniques that helps to define the orientation of the stress field based on the assumption that borehole break-out due to stress relieve happens in the direction of the minimum horizontal stress. In deviated wells such analysis is more complex, but solutions are available2. Keywords: orientation, borehole, borehole wall, borehole ellipticity, upstream oil & gas, ellipticity, wellbore stability analysis, computation, boonen, rock mechanics Subjects: Formation Evaluation & Management, Open hole/cased hole log analysis This content is only available via PDF. 2002. Society of Petroleum Engineers You can access this article if you purchase or spend a download." @default.
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• W4241152738 title "Rock Mechanics and Wellbore Stability Analysis While Drilling using LWD Sonic, Density and Caliper Measurements" @default.
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