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• W4236060904 abstract "Shear-Type Borehole Wall Shifts Induced During Lost Circulations Daiske Iwashita; Daiske Iwashita Waseda University Search for other works by this author on: This Site Google Scholar Nobuo Morita; Nobuo Morita Waseda University Search for other works by this author on: This Site Google Scholar Masako Tominaga Masako Tominaga Waseda University Search for other works by this author on: This Site Google Scholar Paper presented at the SPE Annual Technical Conference and Exhibition, San Antonio, Texas, USA, September 2006. Paper Number: SPE-102275-MS https://doi.org/10.2118/102275-MS Published: September 24 2006 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Get Permissions Search Site Citation Iwashita, Daiske, Morita, Nobuo, and Masako Tominaga. Shear-Type Borehole Wall Shifts Induced During Lost Circulations. Paper presented at the SPE Annual Technical Conference and Exhibition, San Antonio, Texas, USA, September 2006. doi: https://doi.org/10.2118/102275-MS Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex Search nav search search input Search input auto suggest search filter All ContentAll ProceedingsSociety of Petroleum Engineers (SPE)SPE Annual Technical Conference and Exhibition Search Advanced Search AbstractThree typical borehole wall shifts during lost circulations are studied and parameter studies are conducted for evaluating the magnitude of the shifts.Slant-crack induced around vertical wells during lost circulations.Parameters varied are the frac size/wellbore size, frac angle, borehole pressure and ratio.Borehole wall shifts induced during the drilling of normal, thrust, and strike-slip fault areas.Borehole wall shifts induced for an inclined well due to a fracture induced in perpendicular to the minimum in-situ stress.IntroductionPreviously, stuck pipe problems were assumed to be caused by borehole breakouts, differential sticking, and cutting pack offs. However, thorough examinations of borehole walls using borehole televiewers show that some of them are caused by shear type borehole wall shifts. Most borehole wall shifts are less than 0.5 inches and do not create serious drilling problems. However, it has been speculated that borehole size becomes narrow due to borehole wall shifts. The magnitude of borehole wall shifts is evaluated using a 3D non-planner fracture model with a new 3D dual boundary element method. The model includes a slant borehole and a slant circular or elliptical fracture from a borehole. Since a 3-D fracture induces three stress intensity factors (first, second, and third type stress intensity factors), the fracture normally extends in an elliptical rather than circular shape. The model is used to analyze borehole wall shifts with the following three conditions.Borehole wall shifts induced by a slant crack around a vertical well during lost circulations by varying parameters such as (frac size)/(wellbore size), frac angle, borehole pressure, and the three principal in-situ stresses.Borehole wall shifts induced during a small lost circulation at a fault plane for normal, thrust, and strike-slip fault areas.Borehole wall shifts induced for slant wells due to a fracture in perpendicular to the minimum in-situ stress.The results show that the borehole wall shifts are normally minor as observed by borehole imagers if the induced fractures during lost circulations are small, however, non-trivial borehole wall shifts occur if the lost circulation is serious and the fracture angle is offset from the principal in-situ stress directions. In addition, the analysis shows that if the borehole wall shifts are measuredwhile the fracture is open, the directional in-situ stress may be inversely evaluated.The significance of the subject matter is as follows:A new fracture model from a borehole is coded using a 3D dual boundary element method.Minor borehole wall shifts occur with a small scale fluid loss as observed from borehole imagers. Although they do not create drilling problems, the in-situ stresses may be evaluated from the borehole wall shift if the fractured area is identified by acoustic devices.Significant borehole wall shifts occur if a lost circulation is significant and the leak-off plane is inclined from the principal in-situ stress direction. Some drill string stuck problems may be caused by the shear type borehole wall shifts rather than borehole breakouts or differential sticking problems. Keywords: drilling fluid management & disposal, Wellbore Design, Reservoir Characterization, drilling fluids and materials, circulation, stress intensity factor, hydraulic fracturing, Upstream Oil & Gas, wellbore integrity, fracture characterization Subjects: Wellbore Design, Drilling Fluids and Materials, Hydraulic Fracturing, Reservoir Characterization, Wellbore integrity, Drilling fluid management & disposal, Faults and fracture characterization This content is only available via PDF. 2006. Society of Petroleum Engineers You can access this article if you purchase or spend a download." @default.
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• W4236060904 title "Shear-Type Borehole Wall Shifts Induced During Lost Circulations" @default.
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